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Sample records for river-floodplain system danube

  1. Assessment of flood-induced changes of phytoplankton along a river-floodplain system using the morpho-functional approach.

    Science.gov (United States)

    Mihaljević, Melita; Spoljarić, Dubravka; Stević, Filip; Zuna Pfeiffer, Tanja

    2013-10-01

    In this research, we aimed to find out how the differences in hydrological connectivity between the main river channel and adjacent floodplain influence the changes in phytoplankton community structure along a river-floodplain system. The research was performed in the River Danube floodplain (Croatian river section) in the period 2008-2009 characterised by different flooding pattern on an annual time scale. By utilising the morpho-functional approach and multivariate analyses, the flood-derived structural changes of phytoplankton were analysed. The lake stability during the isolation phase triggered the specific pattern of morpho-functional groups (MFG) which were characterised by cyanobacterial species achieving very high biomass. Adversely, the high water turbulence in the lake during the frequent and extreme flooding led to evident similarity between lake and river assemblages. Besides different diatom species (groups of small and large centrics and pennates), which are the most abundant representatives in the river phytoplankton, many other groups such as cryptophytes and colonial phytomonads appeared to indicate altered conditions in the floodplain driven by flooding. Having different functional properties, small centric diatom taxa sorted to only one MFG cannot clearly reflect environmental changes that are shown by the species-level pattern. Disadvantages in using the MFG approach highlight that it is still necessary to combine it with taxonomical approach in monitoring of phytoplankton in the river-floodplain ecosystems.

  2. Impact of drying and re-flooding of sediment on phosphorus dynamics of river-floodplain systems.

    Science.gov (United States)

    Schönbrunner, Iris M; Preiner, Stefan; Hein, Thomas

    2012-08-15

    One of the consequences of human impacts on floodplains is a change in sedimentation leading to enhanced floodplain aggradation. Thus, accumulated sediments rich in nutrients might interfere with floodplain restoration. In this study we investigated the phosphorus release behavior of sediments from shallow backwaters of an isolated floodplain of the Danube River situated east of the city of Vienna with the aim to understand the effects of changes in dry/wet cycles on established floodplain sediments. In the light of restoration plans aiming at increased surface water exchange with the river main channel, the response of sediments to frequent alternations between desiccation and inundation periods is a key issue as changes of sediment properties are expected to affect phosphorus release. In order to determine the effect of changing hydrological conditions on internal phosphorus loading, we exposed sediments to different dry/wet treatments in a laboratory experiment. Total phosphorus (TP) release from sediments into the water column increased with increasing duration of dry periods prior to re-wetting. Partial correlation analysis showed significant positive correlations between ΔTP and ΔNH(4)(+) as well as between ΔTP and ΔFe(3+) concentrations (Δ refers to the difference between the final and initial concentration during the wetting period), indicating that enhanced mineralization rates leading to a concomitant release of NH(4)(+) and TP and the reduction of iron hydroxides leading to a concomitant release of Fe(3+) and TP are the mechanisms responsible for the rise in TP. Repeated drying and wetting resulted in elevated phosphorus release. This effect was more pronounced when drying periods led to an 80% reduction in water content, indicating that the degree of drying is a major determinant controlling phosphorus release upon re-wetting. The reconnection of isolated floodplains will favor fluctuating hydrologic conditions and is therefore expected to

  3. Sulfate-reducing prokaryotes in river floodplains

    NARCIS (Netherlands)

    Miletto, M.

    2007-01-01

    This thesis constitutes a pioneer attempt at elucidating the ecology of sulfate-reducing prokaryotes in river floodplains. These are non-typical sulfate-reducing environmental settings, given the generally low sulfate concentration that characterize freshwater habitats, and river flow regulation

  4. Hydrological and hydraulic modelling of the Nyl River floodplain Part ...

    African Journals Online (AJOL)

    2007-01-01

    Jan 1, 2007 ... Keywords: Nyl River floodplain, Nylsvlei, Nylsvley Nature Reserve, modelling wetland hydraulics, wetland evapotranspiration ..... A review of suitable methods for estimating evapotranspira- ..... ingum routing. J. Hydrol.

  5. Floods and fish : recruitment and distribution of fish in the Volga River floodplain

    NARCIS (Netherlands)

    Górski, K.

    2010-01-01

    Natural river floodplains are among the most diverse and productive ecosystems on Earth and provide key habitats for foraging, spawning and as a nursery for many riverine fish species. Periodic flooding plays a principal role in the ecological processes in floodplain systems resulting in high produc

  6. Breeding bird study in the Mississippi River Floodplain

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — A breeding bird study was initiated in 1992 to census birds on the Gardner Division of Mark Twain NWR. The division is located in the Mississippi River floodplain...

  7. Gravel-bed river floodplains are the ecological nexus of glaciated mountain landscapes.

    Science.gov (United States)

    Hauer, F Richard; Locke, Harvey; Dreitz, Victoria J; Hebblewhite, Mark; Lowe, Winsor H; Muhlfeld, Clint C; Nelson, Cara R; Proctor, Michael F; Rood, Stewart B

    2016-06-01

    Gravel-bed river floodplains in mountain landscapes disproportionately concentrate diverse habitats, nutrient cycling, productivity of biota, and species interactions. Although stream ecologists know that river channel and floodplain habitats used by aquatic organisms are maintained by hydrologic regimes that mobilize gravel-bed sediments, terrestrial ecologists have largely been unaware of the importance of floodplain structures and processes to the life requirements of a wide variety of species. We provide insight into gravel-bed rivers as the ecological nexus of glaciated mountain landscapes. We show why gravel-bed river floodplains are the primary arena where interactions take place among aquatic, avian, and terrestrial species from microbes to grizzly bears and provide essential connectivity as corridors for movement for both aquatic and terrestrial species. Paradoxically, gravel-bed river floodplains are also disproportionately unprotected where human developments are concentrated. Structural modifications to floodplains such as roads, railways, and housing and hydrologic-altering hydroelectric or water storage dams have severe impacts to floodplain habitat diversity and productivity, restrict local and regional connectivity, and reduce the resilience of both aquatic and terrestrial species, including adaptation to climate change. To be effective, conservation efforts in glaciated mountain landscapes intended to benefit the widest variety of organisms need a paradigm shift that has gravel-bed rivers and their floodplains as the central focus and that prioritizes the maintenance or restoration of the intact structure and processes of these critically important systems throughout their length and breadth.

  8. Gravel-bed river floodplains are the ecological nexus of glaciated mountain landscapes

    Science.gov (United States)

    Hauer, F. Richard; Locke, Harvey; Dreitz, Victoria; Hebblewhite, Mark; Lowe, Winsor; Muhlfeld, Clint C.; Nelson, Cara; Proctor, Michael F; Rood, Stewart B.

    2016-01-01

    Gravel-bed river floodplains in mountain landscapes disproportionately concentrate diverse habitats, nutrient cycling, productivity of biota, and species interactions. Although stream ecologists know that river channel and floodplain habitats used by aquatic organisms are maintained by hydrologic regimes that mobilize gravel-bed sediments, terrestrial ecologists have largely been unaware of the importance of floodplain structures and processes to the life requirements of a wide variety of species. We provide insight into gravel-bed rivers as the ecological nexus of glaciated mountain landscapes. We show why gravel-bed river floodplains are the primary arena where interactions take place among aquatic, avian, and terrestrial species from microbes to grizzly bears and provide essential connectivity as corridors for movement for both aquatic and terrestrial species. Paradoxically, gravel-bed river floodplains are also disproportionately unprotected where human developments are concentrated. Structural modifications to floodplains such as roads, railways, and housing and hydrologicaltering hydroelectric or water storage dams have severe impacts to floodplain habitat diversity and productivity, restrict local and regional connectivity, and reduce the resilience of both aquatic and terrestrial species, including adaptation to climate change. To be effective, conservation efforts in glaciated mountain landscapes intended to benefit the widest variety of organisms need a paradigm shift that has gravel-bed rivers and their floodplains as the central focus and that prioritizes the maintenance or restoration of the intact structure and processes of these critically important systems throughout their length and breadth.

  9. Gravel-bed river floodplains are the ecological nexus of glaciated mountain landscapes

    Science.gov (United States)

    Hauer, F. Richard; Locke, Harvey; Dreitz, Victoria J.; Hebblewhite, Mark; Lowe, Winsor H.; Muhlfeld, Clint C.; Nelson, Cara R.; Proctor, Michael F.; Rood, Stewart B.

    2016-01-01

    Gravel-bed river floodplains in mountain landscapes disproportionately concentrate diverse habitats, nutrient cycling, productivity of biota, and species interactions. Although stream ecologists know that river channel and floodplain habitats used by aquatic organisms are maintained by hydrologic regimes that mobilize gravel-bed sediments, terrestrial ecologists have largely been unaware of the importance of floodplain structures and processes to the life requirements of a wide variety of species. We provide insight into gravel-bed rivers as the ecological nexus of glaciated mountain landscapes. We show why gravel-bed river floodplains are the primary arena where interactions take place among aquatic, avian, and terrestrial species from microbes to grizzly bears and provide essential connectivity as corridors for movement for both aquatic and terrestrial species. Paradoxically, gravel-bed river floodplains are also disproportionately unprotected where human developments are concentrated. Structural modifications to floodplains such as roads, railways, and housing and hydrologic-altering hydroelectric or water storage dams have severe impacts to floodplain habitat diversity and productivity, restrict local and regional connectivity, and reduce the resilience of both aquatic and terrestrial species, including adaptation to climate change. To be effective, conservation efforts in glaciated mountain landscapes intended to benefit the widest variety of organisms need a paradigm shift that has gravel-bed rivers and their floodplains as the central focus and that prioritizes the maintenance or restoration of the intact structure and processes of these critically important systems throughout their length and breadth. PMID:27386570

  10. On river-floodplain interaction and hydrograph skewness

    Science.gov (United States)

    Fleischmann, Ayan S.; Paiva, Rodrigo C. D.; Collischonn, Walter; Sorribas, Mino V.; Pontes, Paulo R. M.

    2016-10-01

    Understanding hydrological processes occurring within a basin by looking at its outlet hydrograph can improve and foster comprehension of ungauged regions. In this context, we present an extensive examination of the roles that floodplains play on driving hydrograph shapes. Observations of many river hydrographs with large floodplain influence are carried out and indicate that a negative skewness of the hydrographs is present among many of them. Through a series of numerical experiments and analytical reasoning, we show how the relationship between flood wave celerity and discharge in such systems is responsible for determining the hydrograph shapes. The more water inundates the floodplains upstream of the observed point, the more negatively skewed is the observed hydrograph. A case study is performed in the Amazon River Basin, where major rivers with large floodplain attenuation (e.g., Purus, Madeira, and Juruá) are identified with higher negative skewness in the respective hydrographs. Finally, different wetland types could be distinguished by using this feature, e.g., wetlands maintained by endogenous processes, from wetlands governed by overbank flow (along river floodplains). A metric of hydrograph skewness was developed to quantify this effect, based on the time derivative of discharge. Together with the skewness concept, it may be used in other studies concerning the relevance of floodplain attenuation in large, ungauged rivers, where remote sensing data (e.g., satellite altimetry) can be very useful.

  11. Biogeography of sulfate-reducing prokaryotes in river floodplains

    NARCIS (Netherlands)

    Miletto, M.; Loy, A.; Antheunisse, A.M.; Loeb, R.; Bodelier, P.L.E.; Laanbroek, R.

    2008-01-01

    In this study, a large-scale field survey was conducted to describe the biogeography of sulfate-reducing prokaryotes (SRPs) in river floodplains. Fingerprints obtained with three methods, i.e. 16S rRNA gene-based oligonucleotide microarray, dsrB-based denaturing gradient gel electrophoresis (DGGE) a

  12. Application of near-surface geophysics as part of a hydrologic study of a subsurface drip irrigation system along the Powder River floodplain near Arvada, Wyoming

    Science.gov (United States)

    Sams, James I.; Veloski, Garret; Smith, Bruce D.; Minsley, Burke J.; Engle, Mark A.; Lipinski, Brian A.; Hammack, Richard W.; Zupancic, John W.

    2014-01-01

    Rapid development of coalbed natural gas (CBNG) production in the Powder River Basin (PRB) of Wyoming has occurred since 1997. National attention related to CBNG development has focused on produced water management, which is the single largest cost for on-shore domestic producers. Low-cost treatment technologies allow operators to reduce their disposal costs, provide treated water for beneficial use, and stimulate oil and gas production by small operators. Subsurface drip irrigation (SDI) systems are one potential treatment option that allows for increased CBNG production by providing a beneficial use for the produced water in farmland irrigation.Water management practices in the development of CBNG in Wyoming have been aided by integrated geophysical, geochemical, and hydrologic studies of both the disposal and utilization of water. The U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) and the U.S. Geological Survey (USGS) have utilized multi-frequency airborne, ground, and borehole electromagnetic (EM) and ground resistivity methods to characterize the near-surface hydrogeology in areas of produced water disposal. These surveys provide near-surface EM data that can be compared with results of previous surveys to monitor changes in soils and local hydrology over time as the produced water is discharged through SDI.The focus of this investigation is the Headgate Draw SDI site, situated adjacent to the Powder River near the confluence of a major tributary, Crazy Woman Creek, in Johnson County, Wyoming. The SDI system was installed during the summer of 2008 and began operation in October of 2008. Ground, borehole, and helicopter electromagnetic (HEM) conductivity surveys were conducted at the site prior to the installation of the SDI system. After the installation of the subsurface drip irrigation system, ground EM surveys have been performed quarterly (weather permitting). The geophysical surveys map the heterogeneity of the near

  13. QMRAcatch: Human-Associated Fecal Pollution and Infection Risk Modeling for a River/Floodplain Environment.

    Science.gov (United States)

    Derx, Julia; Schijven, Jack; Sommer, Regina; Zoufal-Hruza, Christa M; van Driezum, Inge H; Reischer, Georg; Ixenmaier, Simone; Kirschner, Alexander; Frick, Christina; de Roda Husman, Ana Maria; Farnleitner, Andreas H; Blaschke, Alfred Paul

    2016-07-01

    Protection of drinking water resources requires addressing all relevant fecal pollution sources in the considered catchment. A freely available simulation tool, QMRAcatch, was recently developed to simulate concentrations of fecal indicators, a genetic microbial source tracking (MST) marker, and intestinal pathogens in water resources and to conduct a quantitative microbial risk assessment (QMRA). At the same time, QMRAcatch was successfully applied to a region of the Danube River in Austria, focusing on municipal wastewater emissions. Herein, we describe extension of its application to a Danube River floodplain, keeping the focus on fecal sources of human origin. QMRAcatch was calibrated to match measured human-associated MST marker concentrations for a dry year and a wet year. Appropriate performance characteristics of the human-associated MST assay were proven by simulating correct and false-positive marker concentrations, as determined in human and animal feces. With the calibrated tool, simulated and measured enterovirus concentrations in the rivers were compared. Finally, the calibrated tool allowed demonstrating that 4.5 log enterovirus and 6.6 log norovirus reductions must be achieved to convert current surface water to safe drinking water that complies with a health-based target of 10 infections person yr. Simulations of the low- and high-pollution scenarios showed that the required viral reductions ranged from 0 to 8 log. This study has implications for water managers with interests in assessing robust catchment protection measures and water treatment criteria by considering the fate of fecal pollution from its sources to the point of abstraction.

  14. A spatial simulation model for forest succession in the Upper Mississippi River floodplain

    Science.gov (United States)

    Yin, Y.; Wu, Y.; Bartell, S.M.

    2009-01-01

    A Markov-chain transition model (FORSUM) and Monte Carlo simulations were used to simulate the succession patterns and predict a long-term impact of flood on the forest structure and growth in the floodplain of the Upper Mississippi River and Illinois River. Model variables, probabilities, functions, and parameters were derived from the analysis of two comprehensive field surveys conducted in this floodplain. This modeling approach describes the establishment, growth, competition, and death of individual trees for modeled species on a 10,000-ha landscape with spatial resolution of 1 ha. The succession characteristics of each Monte Carlo simulation are summed up to describe forest development and dynamics on a landscape level. FORSUM simulated the impacts of flood intensity and frequency on species composition and dynamics in the Upper Mississippi River floodplain ecosystem. The model provides a useful tool for testing hypotheses about forest succession and enables ecologists and managers to evaluate the impacts of flood disturbances and ecosystem restoration on forest succession. The simulation results suggest that the Markov-chain Monte Carlo method is an efficient tool to help organize the existing data and knowledge of forest succession into a system of quantitative predictions for the Upper Mississippi River floodplain ecosystem. ?? 2009 Elsevier B.V.

  15. Unique diversity of radioactive particles found in the Yenisei River floodplain.

    Science.gov (United States)

    Bolsunovsky, Alexander; Melgunov, Mikhail; Chuguevskii, Alexey; Lind, Ole Christian; Salbu, Brit

    2017-09-11

    The long-term operation of three reactors and the radiochemical plant of the Mining-and-Chemical Combine (MCC), Russia's largest producer of weapons-grade plutonium, has resulted in radioactive contamination of the Yenisei River floodplain. From 1995 to 2016, we found more than 200 radioactive particles (RP) in the Yenisei floodplain, downstream of the MCC. Analytical characterization showed that most of the RP were fuel particles, which were carried into the river after incidents at the MCC reactors. Having compared the (137)Cs/(134)Cs ratios in the particles, we determined three time intervals when the RP were formed. The plutonium isotope ratios ((238)Pu/(239,240)Pu) vary substantially between the particles and indicate several different source terms. In addition to fuel RP, we found particles that only contained activation products ((60)Co or europium isotopes). SEM and γ-spectrometry showed that the cobalt particles could have originated from the corrosion of the reactor coolant system and the europium particles - from the damaged compensating rods. No europium particles have been found anywhere else in the world. The presence of RP from different sources (fuel, cobalt, and europium particles) in the Yenisei River floodplain makes this region a unique site for studying environmental effects of the particles. These RP represent point sources of radioecological significance.

  16. PAH desorption from river floodplain soils using supercritical fluid extraction.

    Science.gov (United States)

    Yang, Yi; Cajthaml, Tomás; Hofmann, Thilo

    2008-12-01

    Sequential supercritical fluid extraction (SFE) was performed in order to estimate desorption of PAHs from river floodplain soils which contain coal and coal-derived particles. Original soils, soils' light fractions (rhoextractable contaminants ranged from decades for 2-4-ring PAHs and hundreds of years for 5-6-ring PAHs. We demonstrate that, despite high soil PAH concentrations which are due to coal and coal-derived particles, the general environmental risk is reduced by the very slow and extremely slow desorption rates.

  17. Ecology of invasive Melilotus albus on Alaskan glacial river floodplains

    Science.gov (United States)

    Conn, Jeff S.; Werdin-Pfisterer, Nancy R.; Beattie, Katherine L.; Densmore, Roseann V.

    2011-01-01

    Melilotus albus (white sweetclover) has invaded Alaskan glacial river floodplains. We measured cover and density of plant species and environmental variables along transects perpendicular to the Nenana, Matanuska, and Stikine Rivers to study interactions between M. albus and other plant species and to characterize the environment where it establishes. Melilotus albus was a pioneer species on recently disturbed sites and did not persist into closed canopy forests. The relationships between M. albus cover and density and other species were site-specific.Melilotus albus was negatively correlated with native species Elaeagnus commutata at the Nenana River, but not at the Matanuska River. Melilotus albus was positively correlated with the exotic species Crepis tectorumand Taraxacum officinale at the Matanuska River and T. officinale on the upper Stikine River. However, the high density of M. albus at a lower Stikine River site was negatively correlated with T. officinale and several native species including Lathyrus japonicus var. maritimus and Salix alaxensis. Glacial river floodplains in Alaska are highly disturbed and are corridors for exotic plant species movement. Melilotus albus at moderate to low densities may facilitate establishment of exotic species, but at high densities can reduce the cover and density of both exotic and native species.

  18. QMRAcatch - faecal microbial quality of water resources in a river-floodplain area affected by urban sources and recreational visitors

    Science.gov (United States)

    Derx, Julia; Schijven, Jack; Sommer, Regina; Kirschner, Alexander; Farnleitner, Andreas H.; Blaschke, Alfred Paul

    2016-04-01

    QMRAcatch, a tool to simulate microbial water quality including infection risk assessment, was previously developed and successfully tested at a Danube river site (Schijven et al. 2015). In the tool concentrations of target faecal microorganisms and viruses (TMVs) are computed at a point of interest (PI) along the main river and the floodplain river at daily intervals for a one year period. Even though faecal microbial pathogen concentrations in water resources are usually below the sample limit of detection, this does not ensure, that the water quality complies with a certain required health based target. The aim of this study was therefore to improve the predictability of relevant human pathogenic viruses, i.e. enterovirus and norovirus, in the studied river/floodplain area. This was done by following an innovative calibration strategy based on human-associated microbial source tracking (MST) marker data which were determined following the HF183 TaqMan assay (Green et al. 2011). The MST marker is strongly associated with human faeces and communal sewage, occurring there in numbers by several magnitudes higher than for human enteric pathogens (Mayer et al 2015). The calibrated tool was then evaluated with measured enterovirus concentrations at the PI and in the floodplain river. In the simulation tool the discharges of 5 wastewater treatment plants (WWTPs) were considered with point discharges along a 200 km reach of the Danube river. The MST marker and target virus concentrations at the PI at a certain day were computed based on the concentrations of the previous day, plus the wastewater concentrations times the WWTP discharge divided by the river discharge. A ratio of the river width was also considered, over which the MST marker and virus particles have fully mixed with river water. In the tool, the excrements from recreational visitors frequenting the floodplain area every day were assumed to be homogeneously distributed in the area. A binomial distributed

  19. Spatial Patterns in Biofilm Diversity across Hierarchical Levels of River-Floodplain Landscapes.

    Directory of Open Access Journals (Sweden)

    Marc Peipoch

    Full Text Available River-floodplain systems are among the most diverse and productive ecosystems, but the effects of biophysical complexity at multiple scales on microbial biodiversity have not been studied. Here, we investigated how the hierarchical organization of river systems (i.e., region, floodplain, zone, habitats, and microhabitats influences epilithic biofilm community assemblage patterns by characterizing microbial communities using 16S rRNA gene sequence data and analyzing bacterial species distribution across local and regional scales. Results indicate that regional and local environmental filters concurrently sort bacterial species, suggesting that spatial configuration of epilithic biofilms resembles patterns of larger organisms in floodplain ecosystems. Along the hierarchical organization of fluvial systems, floodplains constitute a vector of maximum environmental heterogeneity and consequently act as a major landscape filter for biofilm species. Thus, river basins and associated floodplains may simply reflect very large scale 'patches' within which environmental conditions select for community composition of epilithic biofilms.

  20. Waste management system in the riparian towns of the Romanian Danube sector

    Directory of Open Access Journals (Sweden)

    Radu Săgeată

    2016-09-01

    Full Text Available In Romania, managing and recycling household garbage is one of the least performing systems in the European Union. Numerous waste dumping sites are unconformable to European standards, besides there is little garbage recycling. This paper makes a complex waste management analysis of the Romanian Danube riparian towns subjected to strong human pressure; this sector is also of great European interest for the protection of its biodiversity. The main dysfunctions of garbage dumping, the price asked by scavenging services, the steps taken for the ecological management of waste dumping sites in conformity with EU norms and better waste recycling, as well as future measures are also discussed in this paper.

  1. Environmental effects of the dam system on the Danube at Boes-Nagymaros

    Energy Technology Data Exchange (ETDEWEB)

    Perczel, K. (VATI, Budapest (HU)); Libik, G. (Stockholm Univ. (SE). Inst. for Informatics and System Science)

    1989-01-01

    This article deals with the expected environmental disturbances following the plans for building a dam system for hydroelectricity production on the Danube river, on both sides of the border between Hungary and Czechoslovakia. Among a series of serious effects may be mentioned: Slowing of the water flow, which will increase silting and reduce the rivers 'self-cleaning' ability concerning the release of untreated sewage from population centers along the river; flooding of productive agricultural land; contamination of vital fresh water reserves; extreme watertables, which will make agriculture impossible and spoil the forests along affected parts of the river. (U.W.).

  2. Vascular flora of the Upper Paraná River floodplain.

    Science.gov (United States)

    Souza, M C; Kawakita, K; Slusarski, S R; Pereira, G F

    2009-06-01

    The purpose of this study was to update the floristic inventory found in the Upper Paraná River floodplain. Floristic surveys were performed from February 2000 through March 2008, as part of the Brazilian Long-Term Ecological Research Program (PELD/CNPq-Site 6). The material collected was identified from 774 species, 442 genera, and 116 families. The ten families with high species richness were Leguminosae, Poaceae, Rubiaceae, Asteraceae, Euphorbiaceae, Myrtaceae, Cyperaceae, Solanaceae, Sapindaceae, and Orchidaceae, which contributed to 46.1% of the total number of species. Genera with high richness were Solanum, Cyperus, Panicum, Eugenia, Tillandsia, Serjania, Casearia, and Polygonum, which together contributed to 10.2% of the total number of species. These data, combined with information published in 1997, recorded 955 species, 575 genera, and 128 families. These organisms were from several riparian environments and were distributed as herbs, shrubs, trees, climbers and epiphytes. Panicum maximum, Pennisetum purpureum, Ricinus communis, and Urochloa decumbens are considered weeds due to the wide distributions determined for these species. The results presented herein suggest the need to further investigate the control of these potential weed species.

  3. Wetland tree transpiration modified by river-floodplain connectivity

    Science.gov (United States)

    Allen, Scott T; Krauss, Ken W.; Cochran, J. Wesley; King, Sammy L.; Keim, Richard F.

    2016-01-01

    Hydrologic connectivity provisions water and nutrient subsidies to floodplain wetlands and may be particularly important in floodplains with seasonal water deficits through its effects on soil moisture. In this study, we measured sapflow in 26 trees of two dominant floodplain forest species (Celtis laevigata and Quercus lyrata) at two hydrologically distinct sites in the lower White River floodplain in Arkansas, USA. Our objective was to investigate how connectivity-driven water table variations affected water use, an indicator of tree function. Meteorological variables (photosynthetically active radiation and vapor pressure deficit) were the dominant controls over water use at both sites; however, water table variations explained some site differences. At the wetter site, highest sapflow rates were during a late-season overbank flooding event, and no flood stress was apparent. At the drier site, sapflow decreased as the water table receded. The late-season flood pulse that resulted in flooding at the wetter site did not affect the water table at the drier site; accordingly, higher water use was not observed at the drier site. The species generally associated with wetter conditions (Q. lyrata) was more positively responsive to the flood pulse. Flood water subsidy lengthened the effective growing season, demonstrating ecological implications of hydrologic connectivity for alleviating water deficits that otherwise reduce function in this humid floodplain wetland.

  4. Water quality of Danube Delta systems: ecological status and prediction using machine-learning algorithms.

    Science.gov (United States)

    Stoica, C; Camejo, J; Banciu, A; Nita-Lazar, M; Paun, I; Cristofor, S; Pacheco, O R; Guevara, M

    2016-01-01

    Environmental issues have a worldwide impact on water bodies, including the Danube Delta, the largest European wetland. The Water Framework Directive (2000/60/EC) implementation operates toward solving environmental issues from European and national level. As a consequence, the water quality and the biocenosis structure was altered, especially the composition of the macro invertebrate community which is closely related to habitat and substrate heterogeneity. This study aims to assess the ecological status of Southern Branch of the Danube Delta, Saint Gheorghe, using benthic fauna and a computational method as an alternative for monitoring the water quality in real time. The analysis of spatial and temporal variability of unicriterial and multicriterial indices were used to assess the current status of aquatic systems. In addition, chemical status was characterized. Coliform bacteria and several chemical parameters were used to feed machine-learning (ML) algorithms to simulate a real-time classification method. Overall, the assessment of the water bodies indicated a moderate ecological status based on the biological quality elements or a good ecological status based on chemical and ML algorithms criteria.

  5. Flooding ecology of voles, mice and shrews: the importance of geomorphological and vegetational heterogeneity in river floodplains

    NARCIS (Netherlands)

    Wijnhoven, S.; Velde, G. van der; Leuven, R.S.E.W.; Smits, A.J.M.

    2005-01-01

    Since voles, mice and shrews are important animals in food chains of river floodplains, there is a need for data on their spatial and temporal distribution in periodically flooded areas. During a live trapping study between two successive floods in an embanked river floodplain, the ’Afferdensche en

  6. Multi-criteria decision support for the revitalisation of river floodplains

    NARCIS (Netherlands)

    Zsuffa, I.J.

    2001-01-01

    Ecological revitalisation of river floodplains has become a very actual issue worldwide. It has been recognised that floodplains have the potential to become ecologically very productive areas inhabited by many valuable and rare species. Floodplains also play an important role in regional

  7. Multi-criteria decision support for the revitalisation of river floodplains

    NARCIS (Netherlands)

    Zsuffa, I.J.

    2001-01-01

    Ecological revitalisation of river floodplains has become a very actual issue worldwide. It has been recognised that floodplains have the potential to become ecologically very productive areas inhabited by many valuable and rare species. Floodplains also play an important role in regional and even i

  8. Exploring field vegetation reflectance as an indicator of soil contamination in river floodplains.

    NARCIS (Netherlands)

    Kooistra, L.; Salas, E.A.; Clevers, J.G.; Wehrens, H.R.M.J.; Leuven, R.S.E.W.; Nienhuis, P.H.; Buydens, L.M.C.

    2004-01-01

    This study investigated the relation between vegetation reflectance and elevated concentrations of the metals Ni, Cd, Cu, Zn and Pb in river floodplain soils. High-resolution vegetation reflectance spectra in the visible to near-infrared (400-1350 nm) were obtained using a field radiometer. The rela

  9. Exploring field vegetation reflectance as an indicator of soil contamination in river floodplains

    NARCIS (Netherlands)

    Kooistra, L.; Salas, E.A.L.; Clevers, J.G.P.W.; Wehrens, H.R.M.J.; Leuven, R.S.E.W.; Nienhuis, P.H.; Buydens, L.M.C.

    2004-01-01

    This study investigated the relation between vegetation reflectance and elevated concentrations of the metals Ni, Cd, Cu, Zn and Pb in river floodplain soils. High-resolution vegetation reflectance spectra in the visible to near-infrared (400-1350 nm) were obtained using a field radiometer. The rela

  10. Hydropower plant Nagymaros within the system Gabcikovo-Nagymaros/Danube. Kraftwerk Nagymaros innerhalb des Staustufensystems Gabcikovo-Nagymaros/Donau

    Energy Technology Data Exchange (ETDEWEB)

    Schmidt, E. (Oesterreichische Donaukraftwerke A.G. (DOKW), Vienna (Austria))

    1990-06-01

    In 1977, a convention was concluded between Czechoslovakia and the People's Republic of Hungary with the objective of a joint energetic use of the Danube river in its border line section between the two countries, as well as in its purely Czechoslovakian and in a part of its purely Hungarian section. The project is known as the 2-stage Gabcikova-Nagymaros hydro system. Commensurate to a multipurpose project, the implementation of this hydro system will improve the waterway Danube, as well as the flood protection of settlements adjacent to the river. Both partners will take over 50% of the construction cost and will, in return, have a 50% share of the project's energy output. (orig.).

  11. Artisanal Fisheries in the Ndumo Area of the Lower Phongolo River Floodplain, South Africa

    Directory of Open Access Journals (Sweden)

    Hendri C. Coetzee

    2015-03-01

    Full Text Available The aim of this study was to investigate the status of artisanal fisheries in the lower Phongolo River floodplain in northern KwaZulu-Natal, South Africa. A cross-sectional quantitative survey design was used that included the development of a questionnaire and a systematic survey among the five villages bordering the Ndumo Game Reserve. Data were collected over a 5-day period by a group of 16 fieldworkers and analysed using the Statistical Package for the Social Sciences, version 21. The results revealed that fish was the third most consumed protein in the area, that people consumed fish on average twice a week, that at least six fish species (and one recently introduced crayfish species were consumed regularly, and that most fish were obtained from local vendors, who in turn bought it from local fishermen and -women. Fishing activities also appeared to occur predominantly along the river system and targeted mainly red-breasted tilapia (Tilapia rendalli and Mozambique tilapia (Oreochromis mossambicus and, to a slightly lesser extent, African sharptooth catfish (Clarias gariepinus and brown squeaker (Synodontis zambezensis.Conservation implications: Given that Ndumo residents predominantly catch fish by means of non-commercial methods, that they do so for reasons of personal consumption and subsistence, and that they mostly target rivers and dams rather than the ecologically sensitive pans in the region, it would seem likely that fishing in the region might be sustainable for the moment. However, it is recommended that studies on the local fish populations and their reproductive rates be conducted so that the actual impact on local fish populations can be determined more accurately. This study serves to provide the necessary baseline data on fish utilisation in the region, which would enable the impact of artisanal fishing on fish reserves in the Ndumo region to be determined once population studies have been completed.

  12. Advance in Research of Ecology and Landscape Reconstruction of the River Floodplain In China

    Institute of Scientific and Technical Information of China (English)

    QIAO Lifang; QI Anguo; ZHANG Yichuan

    2008-01-01

    The research of ecology and landscape reestablishment of river floodplain is considered favorable to its conservation and development. The similarity and difference among river floodplain, wetland, riverside and shore have been reviewed, as well as the progress in the research of floodplain ecology reestablishment in quantitative evaluation, vegetation restoration, the influence on animal habitat and the application of eco-engineering; and of the landscape reestablishment in resource development and utilization, landscape feature and changes, landscape function, structure and control. The potentially important fields are expected to be the change of landscape pattern in different scales, the reasonable protection and utilization in the floodplain tourism, the simulating and monitoring of landscape dynamics, the planning and designing methods of floodplain landscape and the management of floodplain ecosystems.

  13. Edge Effects Are Important in Supporting Beetle Biodiversity in a Gravel-Bed River Floodplain

    OpenAIRE

    2014-01-01

    Understanding complex, dynamic, and diverse ecosystems is essential for developing sound management and conservation strategies. Gravel-bed river floodplains are composed of an interlinked mosaic of aquatic and terrestrial habitats hosting a diverse, specialized, and endangered fauna. Therefore, they serve as excellent models to investigate the biodiversity of multiple ecotones and related edge effects. In this study, we investigated the abundance, composition, richness, and conservation stat...

  14. Análise exploratória da socioeconomia de sistemas agroflorestais em várzea flúvio-marinha, Cametá-Pará, Brasil Exploratory socioeconomic analysis of agroforestry systems in tidal river floodplains, Cametá, Pará, Brazil

    Directory of Open Access Journals (Sweden)

    Raimundo Nonato da Silveira Ribeiro

    2004-01-01

    Full Text Available Este trabalho objetivou identificar e caracterizar o sistema de exploração da várzea flúvio-marinha em unidades de produção agroflorestal - UPA, nos aspectos florísticos e socioeconômicos. Utilizaram-se as técnicas do inventário florestal, orçamentos unitários e questionários. Os resultados expressaram uma composição florística média de 2.920,7 indivíduos/ha com circunferência à altura do peito (CAP>10 cm, com maiores frequência de açaí (50,63%, cacau (31,02% e virola (6,76%. O Sistema está constituído pela exploração florestal madeireira, não-madeireira, pesca e criação de aves e suínos. O custo anual do sistema agroflorestal - SAF é de R$ 1.866,25/UPA e a renda bruta anual oriunda do SAF é de R$ 2.959,08/UPA. Concluiu-se que o sistema é do tipo agrossilvipastoril, em que a atividade de criação de aves e suínos utiliza como fonte de alimentos a mariscagem na várzea. A tecnologia utilizada, em princípio, favorece a conservação e preservação do ecossistema, há todavia a necessidade de qualificação de mão-de-obra familiar. A renda bruta anual do SAF denota viabilidade econômica das UPA no nível do salário mínimo, porém, tais unidades são pluriativas, apresentando rendas múltiplas, cujas rendas não-agrícolas são fundamentais para a permanência das famílias na atividade e no meio rural.The purpose of this paper is to identify and characterize forestry and socio-economic systems of tidal river floodplain utilization in agroforestry production units (UPA. Forest inventory techniques, budget sheets and questionnaires were utilized. The results obtained express an average floristic composition of 2,920.7 plants/ha, with a breast-high circumference (CHC>10cm, the highest frequency being for açaí (Euterpe oleracea (50.63%, cocoa (Theobroma cacau (31.02% and virola (Virola surinamensis (6.76%. The system comprises timber and non-timber forest exploitation, fishing, and poultry and swine raising

  15. Investigating a dynamic gas hydrate system in disequilibrium in the Danube Delta, Black Sea

    Science.gov (United States)

    Hillman, Jess; Bialas, Joerg; Klaucke, Ingo; Feldman, Howard; Drexler, Tina

    2017-04-01

    Gas hydrates are known to be extensive across the Danube Delta, as indicated by the presence of bottom simulating reflections (BSRs). The shelf break in this region is characterised by several incised submarine canyons, the largest of which is the Viteaz Canyon, and numerous slope failures. BSRs often coincide with submarine landslides, and it has been proposed that hydrates may play a role in triggering, or facilitating such events. This study focuses on a seafloor canyon (the S2 Canyon) to the north-east of the main Viteaz Canyon, where geophysical survey data and sediment cores were acquired in 2014. Active venting from the seafloor is known to be occurring at this site as multiple flares were been imaged in the water column. The location of these flares coincides with a significant slope failure adjacent to the canyon, and some can be correlated to subsurface gas chimneys, indicating a complex 'plumbing system' of gas migration pathways. This site is of particular interest as the 'present-day' BSR imaged in seismic data is not at equilibrium with the present-day seafloor conditions. Using high resolution 2D seismic data, a P-cable 3D seismic volume and ocean bottom seismometer data we investigate potential gas migration pathways and the complex gas hydrate system in the vicinity of the S2 Canyon. In addition, we use stratigraphic interpretation based on regional 2D seismic lines to constrain the relative ages of the channel levee systems. Through detailed mapping of the BSR, possible paleo-seafloor surfaces and gas migration features we are able to provide estimates of equilibrium conditions for the hydrate system, and examine the controlling factors affecting gas migration pathways and hydrate formation. The results of this study provide new insight into a geologically complex setting with a dynamic hydrate system. Characterising the hydrate system here may help to explain why it is in disequilibrium with the present day seafloor, and provide a better

  16. Kootenai River Floodplain Ecosystem Operational Loss Assessment, Protection, Mitigation and Rehabilitation, 2007-2008 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Merz, Norm [Kootenai Tribe of Idaho

    2009-02-18

    The overarching goals of the 'Kootenai River Floodplain Ecosystem Operational Loss Assessment, Protection, Mitigation and Rehabilitation' Project (BPA Project No.2002-011-00) are to: (1) assess abiotic and biotic factors (i.e., geomorphologic, hydrological, aquatic and riparian/floodplain communities) in determining a definitive composition of ecological integrity, (2) develop strategies to assess and mitigate losses of ecosystem functions, and (3) produce a regional operational loss assessment framework. To produce a scientifically defensible, repeatable, and complete assessment tool, KTOI assembled a team of top scientists in the fields of hydrology, hydraulics, ornithology, entomology, statistics, and river ecology, among other expertise. This advisory team is known as the Research Design and Review Team (RDRT). The RDRT scientists drive the review, selection, and adaptive management of the research designs to evaluate the ecologic functions lost due to the operation of federal hydropower facilities. The unique nature of this project (scientific team, newest/best science, adaptive management, assessment of ecological functions, etc.) has been to work in a dynamic RDRT process. In addition to being multidisciplinary, this model KTOI project provides a stark contrast to the sometimes inflexible process (review, re-review, budgets, etc.) of the Columbia River Basin Fish and Wildlife Program. The project RDRT is assembled annually, with subgroups meeting as needed throughout the year to address project issues, analyses, review, and interpretation. Activities of RDRT coordinated and directed the selection of research and assessment methodologies appropriate for the Kootenai River Watershed and potential for regional application in the Columbia River Basin. The entire RDRT continues to meet annually to update and discuss project progress. RDRT Subcontractors work in smaller groups throughout the year to meet project objectives. Determining the extent to

  17. Influence of dams on river-floodplain dynamics in the Elwha River, Washington

    Science.gov (United States)

    Kloehn, K.K.; Beechie, T.J.; Morley, S.A.; Coe, H.J.; Duda, J.J.

    2008-01-01

    The Elwha dam removal project presents an ideal opportunity to study how historic reduction and subsequent restoration of sediment supply alter river-floodplain dynamics in a large, forested river floodplain. We used remote sensing and onsite data collection to establish a historical record of floodplain dynamics and a baseline of current conditions. Analysis was based on four river reaches, three from the Elwha River and the fourth from the East Fork of the Quinault River. We found that the percentage of floodplain surfaces between 25 and 75 years old decreased and the percentage of surfaces >75 years increased in reaches below the Elwha dams. We also found that particle size decreased as downstream distance from dams increased. This trend was evident in both mainstem and side channels. Previous studies have found that removal of the two Elwha dams will initially release fine sediment stored in the reservoirs, then in subsequent decades gravel bed load supply will increase and gradually return to natural levels, aggrading river beds up to 1 m in some areas. We predict the release of fine sediments will initially create bi-modal grain size distributions in reaches downstream of the dams, and eventual recovery of natural sediment supply will significantly increase lateral channel migration and erosion of floodplain surfaces, gradually shifting floodplain age distributions towards younger age classes.

  18. Field effects of pollutants in dynamic environments; a case study on earthworm populations in river floodplains contaminated with heavy metals

    NARCIS (Netherlands)

    Klok, C.; Goedhart, P.W.; Vandecasteele, B.

    2007-01-01

    In industrialized countries river floodplains can be strongly polluted with heavy metals. Published studies on effects of heavy metal pollution on soil invertebrates in floodplains, however, are inconclusive. This is unexpected since studies in other less dynamic environments reported clear effects

  19. Restoration of hard mast species for wildlife in Missouri using precocious flowering oak in the Missouri River floodplain, USA

    Science.gov (United States)

    B. C. Grossman; M. A. Gold; Daniel C. Dey

    2003-01-01

    Increased planting of hard mast oak species in the Lower Missouri River floodplain is critical as natural regeneration of oak along the Upper Mississippi and Lower Missouri Rivers has been limited following major flood events in 1993 and 1995. Traditional planting methods have limited success due to frequent flood events, competition from faster growing vegetation and...

  20. Condition factor in nine species of fish of the Characidae family in the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    LIZAMA M. DE LOS A. P.

    2002-01-01

    Full Text Available The condition factor for nine species of tropical freshwater fish of the Characidae family in the upper Paraná River floodplain is described. Fish were caught over a period of 12 months (February 1993 to March 1994. Knowledge of the nine species is important for adequate management and maintenance of the biological equilibrium of the ecosystem.

  1. Field effects of pollutants in dynamic environments; a case study on earthworm populations in river floodplains contaminated with heavy metals

    NARCIS (Netherlands)

    Klok, C.; Goedhart, P.W.; Vandecasteele, B.

    2007-01-01

    In industrialized countries river floodplains can be strongly polluted with heavy metals. Published studies on effects of heavy metal pollution on soil invertebrates in floodplains, however, are inconclusive. This is unexpected since studies in other less dynamic environments reported clear effects

  2. River Floodplains as Habitat and Bio-Corridors for Distribution of Land Snails: Their Past and Present

    Directory of Open Access Journals (Sweden)

    Horáčková Jitka

    2015-12-01

    Full Text Available River floodplains of Czech rivers serve as refugia to woodland or hydrophilous gastropods, in current intensively agriculturally utilised, urbanised and largely fragmented landscape. This habitat often form one of the last refuge and replace the natural habitat of these species. River floodplains also represent linear bio-corridors in landscape and allow gastropods to spread through the landscape in both directions, up and down the stream. We showed based on available fossil mollusc successions that development of the floodplain mollusc fauna took place quite different way in various river floodplains, depending on their specifics and geographical location, because especially the ones situated in the chernozem area of the Czech Republic had very different history in comparison with those in higher altitudes. The species richness and composition of recent floodplain malacofauna arises from historical development of particular area/site and depends also on environmental factors such as an elevation, humidity gradient, vegetation type and its biomass, light conditions of the site and soil reaction. Recently, the invasive plants represent a serious problem for current floodplain ecosystems; species richness and abundances of terrestrial mollusc floodplain assemblages are changing due to their effect. The impact on gastropods is species-specific and was described for the following species: Impatiens glandulifera, Fallopia japonica subsp. japonica, F. sachalinensis, F. ×bohemica.

  3. Use of seasonal freshwater wetlands by fishes in a temperate river floodplain

    Science.gov (United States)

    Henning, Julie A.; Gresswell, Robert E.; Fleming, Ian A.

    2007-01-01

    This study examined the use of freshwater wetland restoration and enhancement projects (i.e. non-estuarine wetlands subject to seasonal drying) by fish populations. To quantify fish use of freshwater emergent wetlands and assess the effect of wetland enhancement (i.e. addition of water control structures), two enhanced and two unenhanced emergent wetlands were compared, as well as two oxbow habitats within the Chehalis River floodplain. Eighteen fish species were captured using fyke nets and emigrant traps from January to the beginning of June, with the most abundant being three-spined stickleback Gasterosteus aculeatus and Olympic mudminnow Novumbra hubbsi. Coho salmon Oncorhynchus kisutch was the dominant salmonid at all sites. Enhanced wetlands, with their extended hydroperiods, had significantly higher abundances of yearling coho salmon than unenhanced wetlands. Both enhanced and unenhanced emergent wetlands yielded higher abundances of non-game native fishes than oxbow habitats. Oxbow habitats, however, were dominated by coho salmon. Fish survival in the wetland habitats was dependent on emigration to the river before dissolved oxygen concentrations decreased and wetlands became isolated and stranding occurred. This study suggests that wetland enhancement projects with an outlet to the river channel appear to provide fishes with important temporary habitats if they have the opportunity to leave the wetland as dissolved oxygen levels deteriorate.

  4. Nutrient dynamics in the lower Mississippi river floodplain: Comparing present and historic hydrologic conditions

    Science.gov (United States)

    Schramm, H.L.; Cox, M.S.; Tietjen, T.E.; Ezell, A.W.

    2009-01-01

    Alterations to the lower Mississippi River-floodplain ecosystem to facilitate commercial navigation and to reduce flooding of agricultural lands and communities in the historic floodplain have changed the hydrologic regime. As a result, the flood pulse usually has a lower water level, is of shorter duration, has colder water temperatures, and a smaller area of floodplain is inundated. Using average hydrologic conditions and water temperatures, we used established nitrogen and phosphorus processes in soils, an aquatic ecosystem model, and fish bioenergetic models to provide approximations of nitrogen and phosphorus flux in Mississippi River flood waters for the present conditions of a 2-month (mid-March to mid-May) flood pulse and for a 3-month (mid-March to mid-June), historic flood pulse. We estimated that the soils and aquatic biota can remove or sequester 542 and 976 kg nitrogen ha-1 during the present and historic hydrologic conditions, respectively. Phosphorus, on the other hand, will be added to the water largely as a result of anaerobic soil conditions but moderated by biological uptake by aquatic biota during both present and historic hydrologic conditions. The floodplain and associated water bodies may provide an important management opportunity for reducing downstream transport of nitrogen in Mississippi River waters. ?? 2009, The Society of Wetland Scientists.

  5. Exploring field vegetation reflectance as an indicator of soil contamination in river floodplains.

    Science.gov (United States)

    Kooistra, L; Salas, E A L; Clevers, J G P W; Wehrens, R; Leuven, R S E W; Nienhuis, P H; Buydens, L M C

    2004-01-01

    This study investigated the relation between vegetation reflectance and elevated concentrations of the metals Ni, Cd, Cu, Zn and Pb in river floodplain soils. High-resolution vegetation reflectance spectra in the visible to near-infrared (400-1350 nm) were obtained using a field radiometer. The relations were evaluated using simple linear regression in combination with two spectral vegetation indices: the Difference Vegetation Index (DVI) and the Red-Edge Position (REP). In addition, a multivariate regression approach using partial least squares (PLS) regression was adopted. The three methods achieved comparable results. The best R(2) values for the relation between metals concentrations and vegetation reflectance were obtained for grass vegetation and ranged from 0.50 to 0.73. Herbaceous species displayed a larger deviation from the established relationships, resulting in lower R(2) values and larger cross-validation errors. The results corroborate the potential of hyperspectral remote sensing to contribute to the survey of elevated metal concentrations in floodplain soils under grassland using the spectral response of the vegetation as an indicator. Additional constraints will, however, have to be taken into account, as results are resolution- and location-dependent.

  6. Habitat associations, reproduction and diet of the Guinean tilapia Tilapia guineensis of the Gambia River floodplains.

    Science.gov (United States)

    Louca, V; Lindsay, S W; Piyapong, C; Lucas, M C

    2010-06-01

    The ecology of the Guinean tilapia Tilapia guineensis a dominant species of the lower Gambia River floodplains and an important food source in parts of West Africa was studied to better understand the threat posed from construction of a barrage across the river. The catch per unit effort (CPUE) of T. guineensis was positively associated with conductivity and dissolved oxygen and negatively associated with water depth and the % vegetation cover. Diet studies indicated that the T. guineensis is primarily an iliophage. The peak of reproduction was at the beginning of the rainy season. CPUE peaked in May, just before the first rains, and subsequently declined, probably reflecting movement into newly flooded habitat. Median size at maturity was 11.6 cm total length, L(T), for females and 12.5 cm L(T) for males. L(T)-frequency analysis indicated several juvenile cohorts as well as very young fish on the floodplains each month, suggesting continuation of reproduction throughout the rainy season. The impending construction of a hydroelectric dam on the Gambia River is likely to affect T. guineensis negatively through anticipated changes in the hydrology of the river.

  7. Metals and arsenic in soils and corresponding vegetation at Central Elbe river floodplains (Germany)

    Energy Technology Data Exchange (ETDEWEB)

    Overesch, M. [Department for Geo- and Agroecology, Institute of Spatial Analysis and Planning in Areas of Intensive Agriculture, University of Vechta, P.O. Box 1553, D-49364 Vechta (Germany)]. E-mail: moveresch@ispa.uni-vechta.de; Rinklebe, J. [Department of Soil Science, UFZ Center for Environmental Research Leipzig-Halle, Theodor-Lieser-Strasse 4, D-06120 Halle (Germany)]. E-mail: joerg.rinklebe@ufz.de; Broll, G. [Department for Geo- and Agroecology, Institute of Spatial Analysis and Planning in Areas of Intensive Agriculture, University of Vechta, P.O. Box 1553, D-49364 Vechta (Germany)]. E-mail: gbroll@ispa.uni-vechta.de; Neue, H.-U. [Department of Soil Science, UFZ Center for Environmental Research Leipzig-Halle, Theodor-Lieser-Strasse 4, D-06120 Halle (Germany)]. E-mail: heinz-ulrich.neue@ufz.de

    2007-02-15

    Floodplain soils at the Elbe river are frequently polluted with metals and arsenic. High contents of these pollutants were detected down to subsoil layers. NH{sub 4}NO{sub 3}-extractable (phytoavailable) Cd, Ni, and Zn were elevated in horizons with high acidity. Among five common floodplain plant species, Artemisia vulgaris showed highest concentrations of Cd, Cu, and Hg, Alopecurus pratensis of As and Phalaris arundinacea of Ni, Pb, and Zn. Relationships were weak between metal concentrations in plants and phytoavailable stocks in soil. As and Hg uptake seems to be enhanced on long submerged soils. Enrichments of Cd and Hg are linked to a special plant community composition. Grassland herbage sampled in July/August revealed higher concentrations of As (+122%), Hg (+124%), and Pb (+3723%) than in May. To limit harmful transfers into the food chain, low-lying terraces and flood channels revealing highest contaminations or phytoavailabilities should be excluded from mowing and grazing. - Soils in the Elbe river floodplains are highly polluted with metals and arsenic and a critical enrichment in the grassland herbage seems to be most likely in flood channels or within special plant species.

  8. Aeolian dust supply from the Yellow River floodplain as recorded in the loess-palaeosol sequences from the Mangshan Plateau

    Science.gov (United States)

    Shang, Yuan; Prins, Maarten A.; Beets, Christiaan J.; Kaakinen, Anu; Lahaye, Yann; Troelstra, Simon; Dijkstra, Noortje; Wang, Bin; van Elsas, Roel; Zheng, Hongbo

    2017-04-01

    In central China, the Mangshan loess plateau is located along the southern bank of the lower reach of the Yellow River, well outside the main body of Chinese Loess Plateau (CLP). It contains thick and exceptionally fast accumulated loess-paleosol sequences that provide high-resolution records of Quaternary environmental and climate change. The grain-size distributions, accumulation rates and magnetic susceptibility in the upper part (above the paleosol layer S2) of the Mangshan loess sequence shifted remarkably from its lower part, which likely indicate a change of source for Mangshan dust above S2. Unlike the loess deposits in the CLP, which have been derived from the broad area of northern China, the proximal Yellow River floodplain is considered to have served as a main source for the upper part of Mangshan loess sequence. However, so far, no final diagnostic evidence has been shown on the provenance variation of the Mangshan dust. In this study, we present multiple proxy data and zircon U-Pb ages on the Mangshan loess-paleosol sequences to investigate the dust supply for Mangshan loess. Our results show that the paleosol and loess units in the lower part of the profile (S3-S5, L3-L6) are relative thin and fine-grained and whereas the paleosol (S0-S2) and loess layers (L1 and L2) in the upper part of the sequence are significantly thicker and coarser-grained. The zircon U-Pb age distributions of Mangshan sequence show two predominant age populations: 200-350 Ma and 350-550 Ma. In the lower part of the sequence, the 350-550 Ma age population is more prominent. This is comparable with the zircon age pattern of the sediments in the lower reach of Yellow River, indicating that Yellow River sediments form a major supply for the Mangshan loess deposits at least since 650 ka BP. However, a significant increase of the 200-350 Ma age population is found in the upper part of the Mangshan sequence, likely suggesting an increased contribution of the debris from the regional

  9. Edge effects are important in supporting beetle biodiversity in a gravel-bed river floodplain.

    Directory of Open Access Journals (Sweden)

    Simone D Langhans

    Full Text Available Understanding complex, dynamic, and diverse ecosystems is essential for developing sound management and conservation strategies. Gravel-bed river floodplains are composed of an interlinked mosaic of aquatic and terrestrial habitats hosting a diverse, specialized, and endangered fauna. Therefore, they serve as excellent models to investigate the biodiversity of multiple ecotones and related edge effects. In this study, we investigated the abundance, composition, richness, and conservation status of beetle assemblages at varying sediment depth (0, 0.1, 0.6 and 1.1 m, distance from the channel (1, 5, 20, and 60-100 m, and 5 m within the riparian forest, and time of the year (February-November across a 200 m-wide gravel bar at the near-natural Tagliamento River (Italy, to detect edge effects in four floodplain ecotones: aquatic-terrestrial, forest-active floodplain, sediment-air, and sediment-groundwater. We used conventional pitfall traps and novel tube traps to sample beetles comparably on the sediment surface and within the unsaturated sediments. We found a total of 308 beetle species (including 87 of conservation concern that showed multiple, significant positive edge effects across the floodplain ecotones, mainly driven by spatial heterogeneity: Total and red list beetle abundance and richness peaked on the sediment surface, at channel margins, and at the edge of the riparian forest. All ecotones possessed edge/habitat specialists. Most red list species occurred on the sediment surface, including five species previously considered extinct--yet two of these species occurred in higher densities in the unsaturated sediments. Conservation and management efforts along gravel-bed rivers must therefore promote a dynamic flow and sediment regime to create and maintain habitat heterogeneity and ecotone diversity, which support a unique and high biodiversity.

  10. Edge effects are important in supporting beetle biodiversity in a gravel-bed river floodplain.

    Science.gov (United States)

    Langhans, Simone D; Tockner, Klement

    2014-01-01

    Understanding complex, dynamic, and diverse ecosystems is essential for developing sound management and conservation strategies. Gravel-bed river floodplains are composed of an interlinked mosaic of aquatic and terrestrial habitats hosting a diverse, specialized, and endangered fauna. Therefore, they serve as excellent models to investigate the biodiversity of multiple ecotones and related edge effects. In this study, we investigated the abundance, composition, richness, and conservation status of beetle assemblages at varying sediment depth (0, 0.1, 0.6 and 1.1 m), distance from the channel (1, 5, 20, and 60-100 m, and 5 m within the riparian forest), and time of the year (February-November) across a 200 m-wide gravel bar at the near-natural Tagliamento River (Italy), to detect edge effects in four floodplain ecotones: aquatic-terrestrial, forest-active floodplain, sediment-air, and sediment-groundwater. We used conventional pitfall traps and novel tube traps to sample beetles comparably on the sediment surface and within the unsaturated sediments. We found a total of 308 beetle species (including 87 of conservation concern) that showed multiple, significant positive edge effects across the floodplain ecotones, mainly driven by spatial heterogeneity: Total and red list beetle abundance and richness peaked on the sediment surface, at channel margins, and at the edge of the riparian forest. All ecotones possessed edge/habitat specialists. Most red list species occurred on the sediment surface, including five species previously considered extinct--yet two of these species occurred in higher densities in the unsaturated sediments. Conservation and management efforts along gravel-bed rivers must therefore promote a dynamic flow and sediment regime to create and maintain habitat heterogeneity and ecotone diversity, which support a unique and high biodiversity.

  11. Arsenic species formed from arsenopyrite weathering along a contamination gradient in Circumneutral river floodplain soils.

    Science.gov (United States)

    Mandaliev, Petar N; Mikutta, Christian; Barmettler, Kurt; Kotsev, Tsvetan; Kretzschmar, Ruben

    2014-01-01

    Arsenic is a toxic trace element, which commonly occurs as contaminant in riverine floodplains and associated wetlands affected by mining and ore processing. In this study, we investigated the solid-phase speciation of As in river floodplain soils characterized by circumneutral pH (5.7-7.1) and As concentrations of up to 40.3 g/kg caused by former mining of arsenopyrite-rich ores. Soil samples collected in the floodplain of Ogosta River (Bulgaria) were size-fractionated and subsequently analyzed using a combination of X-ray fluorescence (XRF) spectrometry, powder X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and selective chemical extraction of poorly crystalline mineral phases. Arsenic and Fe were found to be spatially correlated and both elements were strongly enriched in the fine soil particle size fractions (Arsenic K-edge XAS spectra showed the predominance of As(V) and were well fitted with a reference spectrum of As(V) adsorbed to ferrihydrite. Whereas no As(III) was detected, considerable amounts of As(-I) were present and identified as arsenopyrite originating from the mining waste. Iron K-edge XAS revealed that in addition to As(V) adsorbed to ferrihydrite, X-ray amorphous As(V)-rich hydrous ferric oxides ("As-HFO") with a reduced number of corner-sharing FeO6 octahedra relative to ferrihydrite were the dominating secondary As species in the soils. The extremely high concentrations of As in the fine particle size fractions (up to 214 g/kg) and its association with poorly crystalline Fe(III) oxyhydroxides and As-HFO phases suggest a high As mobilization potential under both oxic and anoxic conditions, as well as a high bioaccessibility of As upon ingestion, dermal contact, or inhalation by humans or animals.

  12. Proteocephalidean larvae (Cestoda in naturally infected cyclopid copepods of the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    Dina Lúcia Morais Falavigna

    2003-01-01

    Full Text Available The occurrence, prevalence and infection intensity of proteocephalidean larvae in naturally infected intermediate hosts of the Upper Paraná River floodplain are reported. A total of 5,206 zooplanktonic and benthic organisms were analyzed, namely cyclopid (2,621 and calanoid (1,479 copepods, cladocerans (704, rotifers (307, chironomid larvae (41 and ostracods (54. Eight cyclopid copepods - two copepodids, one male and five females - comprising 0.3% of the cyclopid copepods examined, were naturally infected. The male infected belonged to a species of Paracyclops, and the females to Paracyclops sp., Thermocyclops minutus and Mesocyclops longisetus.

  13. Caloric density of Loricariichthys platymetopon (Osteichthyes, Loricariidae in the Upper Paraná River floodplain, Brazil

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    Daniela Aparecida Garcia

    2010-10-01

    Full Text Available This study analyzed the muscle energy content (caloric density of L. platymetopon captured at different sites of the Upper Paraná River floodplain, and potential relationships between the content and various environmental variables (water temperature, oxygen dissolved in water, food availability, relative numeric abundance and biological variables (body size and reproductive cycle. Quarterly samplings from September 2006 to June 2007 in the lakes and rivers resulted in a sample of 739 specimens, whose muscle caloric density was determined using a calorimeter. Differences between the caloric averages of the males and females and among the different stages of gonadal development were not significant. Caloric density varied over time and space, with two seasonal variation trends. The intensity of the correlation between the caloric density and each environmental variable, as well as the type of correlation, varied according to the sampled site. Body size and reproductive cycle were not correlated with caloric density.Este estudo analisou o conteúdo de energia (densidade calórica de L. platymetopon capturados em diferentes locais da planície alagável do Alto Rio Paraná, e potenciais relações entre este conteúdo e várias variáveis ambientais (temperatura da água, oxigênio dissolvido na água, disponibilidade de alimento, abundância relativa numérica e variáveis biológicas (tamanho corpóreo e ciclo reprodutivo. Coletas trimestrais, de setembro/2006 a junho/2007, em lagos e rios, resultaram em uma amostra de 739 espécimes, cuja densidade calórica muscular foi determinada através de calorímetro. Diferenças entre as médias calóricas de machos e fêmeas e entre os estádios de desenvolvimento gonadal não foram significativas Densidade calórica variou sazonal e espacialmente, com duas tendências de variação sazonal. A intensidade da correlação entre densidade calórica e cada variável e cada variável ambiental, assim como

  14. The significance of sediment contamination in the Elbe River floodplain (Czech Republic)

    Science.gov (United States)

    Chalupová, Dagmar; Janský, Bohumír; Langhammer, Jakub; Šobr, Miroslav; Jiři, Medek; Král, Stanislav; Jiřinec, Petr; Kaiglova, Jana; Černý, Michal; Žáček, Miroslav; Leontovyčova, Drahomíra; Halířová, Jarmila

    2015-04-01

    The abstract brings the information about the research that was focused on anthropogenic pollution of river and lake sediments in the middle course of the Elbe River (Czech Republic). The main aim was to identify and to evaluate the significance of old polluted sediments in the river and its side structures (old meanders, cut lakes, oxbow lakes) between Hradec Králové and Mělník (confluence with the Moldau River) and to assess the risk coming from the remobilization of the contaminated matter. The Elbe River floodplain has been highly inhabited since the Middle Ages, and, especially in the 20th century, major industrial plants were founded here. Since that time, the anthropogenic load of the river and it`s floodplain has grown. Although the contaminants bound to the sediment particles are usually stable, the main risk is coming from the fact that under changes in hydrological regime and water quality (floods, changes in pH, redox-potential, presence of complex substances etc.), the pollution can be released and remobilized again. The most endangered areas are: the surroundings of Pardubice (chemical factory Synthesia, Inc.; refinery PARAMO), and Neratovice (chemical factory Spolana, Inc.). The chemical factories situated close to these towns represented the most problematic polluters of the Elbe River especially during 2nd half of 20th century. In the research, the main attention was aimed at subaquatic sediments of selected cut lakes situated in the vicinity of the above mentioned sources of pollution. To describe the outreach of contamination, several further fluvial lakes were taken into account too. Sediment sampling was carried out from boats on lakes and with the help of drilling rig in the floodplain. Gained sediment cores were divided into several parts which were analysed separately. Chemical analyses included substances identified by ICPER (International Commission for the Protection of the Elbe River) as well as chemicals considered as significant in

  15. How livestock and flooding mediate the ecological integrity of working forests in Amazon River floodplains.

    Science.gov (United States)

    Lucas, Christine M; Sheikh, Pervaze; Gagnon, Paul R; Mcgrath, David G

    2016-01-01

    The contribution of working forests to tropical conservation and development depends upon the maintenance of ecological integrity under ongoing land use. Assessment of ecological integrity requires an understanding of the structure, composition, and function and major drivers that govern their variability. Working forests in tropical river floodplains provide many goods and services, yet the data on the ecological processes that sustain these services is scant. In flooded forests of riverside Amazonian communities, we established 46 0.1-ha plots varying in flood duration, use by cattle and water buffalo, and time since agricultural abandonment (30-90 yr). We monitored three aspects of ecological integrity (stand structure, species composition, and dynamics of trees and seedlings) to evaluate the impacts of different trajectories of livestock activity (alleviation, stasis, and intensification) over nine years. Negative effects of livestock intensification were solely evident in the forest understory, and plots alleviated from past heavy disturbance increased in seedling density but had higher abundance of thorny species than plots maintaining low activity. Stand structure, dynamics, and tree species composition were strongly influenced by the natural pulse of seasonal floods, such that the defining characteristics of integrity were dependent upon flood duration (3-200 d). Forests with prolonged floods ≥ 140 d had not only lower species richness but also lower rates of recruitment and species turnover relative to forests with short floods forest regeneration, but overall forest integrity was largely related to the hydrological regime and age. Given this disjunction between factors mediating canopy and understory integrity, we present a subset of metrics for regeneration and recruitment to distinguish forest condition by livestock trajectory. Although our study design includes confounded factors that preclude a definitive assessment of the major drivers of

  16. Bacterioplankton features and its relations with doc characteristics and other limnological variables in Paraná river floodplain environments (PR/MS-Brazil

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    Mariana Carolina Teixeira

    2011-09-01

    Full Text Available Since the introduction of the Microbial Loop concept, many studies aimed to explain the role of bacterioplankton and dissolved organic carbon (DOC in aquatic ecosystems. Paraná River floodplain system is a very complex environment where these subjects were little explored. The aim of this work was to characterize bacterial community in terms of density, biomass and biovolume in some water bodies of this floodplain and to verify its temporal variation and its relation with some limnological variables, including some indicators of DOC quality, obtained through Ultraviolet-visible (UV-VIS and fluorescence spectroscopic analysis. Bacterial density, biomass and biovolume are similar to those from other freshwater environments and both density and biomass were higher in the period with less rain. The limnological and spectroscopic features that showed any relation with bacterioplankton were the concentrations of N-NH4 and P-PO4, water transparency, and some indicators of DOC quality and origin. The analysis of these relations showed a possible competition between bacterioplankton and phytoplankton for inorganic nutrients and that the DOC used by bacterioplankton is labile and probably from aquatic macrophytes.

  17. Environmental changes and human work in the region of the Upper Paraná River floodplain: processes and interactions

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    EA. Tomanik

    Full Text Available The environment and society constitute a complex of elements and interactions. Thus, an understanding of the processes in which the environment and psychosocial elements are involved may not be gained from knowledge of just one isolated variable. Based on such premises, the present paper, which summarizes the results of a series of studies, adopts work relationships as its main focus, but in addition, it has two complementary objectives. One is to present some analyses on the interaction between human actions and the environmental changes that have been taking place in the region of the Upper Paraná River floodplain and in its boundaries. A secondary aim is to show how those two factors have been changing people's working and living conditions and the identity configuration of some of the human groups that live at that site.

  18. The effect of seasonality on fish species composition and abundance in Rungan river floodplain, Palangkaraya, Central Kalimantan

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    BAMBANG SULISTIYARTO

    2007-10-01

    Full Text Available Tropical floodplain rivers are home to the largest fraction of freshwater fish diversity and as such should be a focal point of fish conservation efforts. The aim of this study was to inventory of the fish fauna and analyzing the effect of seasonality on fish species composition and abundance in the Rungan river floodplain at Palangkaraya Municipality. The results of this study provide background data for conserving fish resources. Fishes were sampled at monthly intervals between May 2005 and April 2006 with gillnets of standardized dimensions with several mesh sizes. These were carried out at three stations with different habitat type, includes forested swamp, opened swamp, and river. A total of 4278 fishes were collected consisting of 50 species and 19 families. Seasonality effects on fish species composition and abundance in forested swamp and river. Fish species composition and abundance in opened swamp tend not to drive by seasonality.

  19. Occurrence of coal and coal-derived particle-bound polycyclic aromatic hydrocarbons (PAHs) in a river floodplain soil.

    Science.gov (United States)

    Yang, Yi; Ligouis, Bertrand; Pies, Carmen; Grathwohl, Peter; Hofmann, Thilo

    2008-01-01

    A PAH contaminated river floodplain soil was separated according to grain size and density. Coal and coal-derived particles from coal mining, coal industry and coal transportation activities were identified by organic petrographic analysis in our samples. Distinct concentrations of PAHs were found in different grain size and density fractions, however, similar distribution patterns of PAHs indicated similar sources. In addition, although light fractions had the mass fraction by weight of less than 5%, they contributed almost 75% of the total PAHs in the soil. PAH concentrations of all sub fractions showed positive correlation with their TOC contents. Altogether, coal and coal-derived particles that were abundant in light fractions could be the dominant geosorbents for PAHs in our samples.

  20. Development of a Web-based GIS monitoring and environmental assessment system for the Black Sea: application in the Danube Delta area.

    Science.gov (United States)

    Tziavos, Ilias N; Alexandridis, Thomas K; Aleksandrov, Borys; Andrianopoulos, Agamemnon; Doukas, Ioannis D; Grigoras, Ion; Grigoriadis, Vassilios N; Papadopoulou, Ioanna D; Savvaidis, Paraskevas; Stergioudis, Argyrios; Teodorof, Liliana; Vergos, Georgios S; Vorobyova, Lyudmila; Zalidis, Georgios C

    2016-08-01

    In this paper, the development of a Web-based GIS system for the monitoring and assessment of the Black Sea is presented. The integrated multilevel system is based on the combination of terrestrial and satellite Earth observation data through the technological assets provided by innovative information tools and facilities. The key component of the system is a unified, easy to update geodatabase including a wide range of appropriately selected environmental parameters. The collection procedure of current and historical data along with the methods employed for their processing in three test areas of the current study are extensively discussed, and special attention is given to the overall design and structure of the developed geodatabase. Furthermore, the information system includes a decision support component (DSC) which allows assessment and effective management of a wide range of heterogeneous data and environmental parameters within an appropriately designed and well-tested methodology. The DSC provides simplified and straightforward results based on a classification procedure, thus contributing to a monitoring system not only for experts but for auxiliary staff as well. The examples of the system's functionality that are presented highlight its usability as well as the assistance that is provided to the decision maker. The given examples emphasize on the Danube Delta area; however, the information layers of the integrated system can be expanded in the future to cover other regions, thus contributing to the development of an environmental monitoring system for the entire Black Sea.

  1. Establishing the system of public communal utility on the river Danube and the river Sava on the territory of Belgrade

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    Pušić Antonije

    2007-01-01

    Full Text Available Waste disposal and treatment problem consideration in the Republic of Serbia is making a pioneer steps. Main goal of this paper is to emphasize problems of waste disposal on waterways in urban areas, which consists of three aspects: uncontrolled disposal, possibilities of waste elimination and institutional model of collecting and recycling. Considering the fact that Draft version of Waste disposal law is not yet adopted by the national government (beside the fact that it contains the question of disposing and recycling municipal solid waste and that it is not elaborating the problem of dumping the municipal waste into rivers, this paper will give methodological and legislative recommendations for the solution of this problem. However, city of Belgrade and the other cities in Serbia are often facing serious problems (arranged riverfronts covered with municipal waste. Because of that, it is necessary to define methods of collecting and treatment of waste disposed in the water streams (in the area of technology. It is also important to determine legislative framework, and also to establish hierarchy in decision-making on the local level. One of the main goals is to determine new aspects of public communal utilities (so called "river communal utility", which will have jurisdiction in this area. International experiences must be analyzed separately and based on them is proposed new concept of elimination of waste from the rivers. Implementation of this pilot project is recommended on the river Danube and the river Sava on the territory of the city of Belgrade.

  2. Semiotic approach to the features of the ‘Danube Script’

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    Marco Merlini

    2005-12-01

    Full Text Available The article presents a matrix of basic semiotic markers and rules for examining the internal structure of the sign system developed in the Neo-Eneolithic in the Danube basin. It is intended a to test the hypothesis that these cultures had an early form of writing, the so-called Danube script; b to infer the principles of this system of writing; c to distinguish between bi- and multi-signs texts of the Danube script, without knowing what any of them meant, from compounds of signs associated with other communication codes, among them decoration, symbols, and divinity identifiers. The matrix is applied to some recent discoveries selected not from the core area of the Danube civilization in the Vinča region, but from peripheral regions, in order to document how widespread the Danube script was.

  3. Crucial European and international strategic documents for guiding the spatial development of the Danube region in Serbia

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    Maksin Marija

    2011-01-01

    Full Text Available Corridor VII, the Danube development belt and the Danube River Basin represent a basis for the development of Serbia’s spatial, economic, social and cultural relations with the Danube countries and the implementation of the European strategic documents concerning the management of the sustainable spatial development of the Danube Region. Therefore, this paper analyzes the implementation approaches, priority areas, actions and instruments determined by the relevant European and international strategic documents for the Danube, and the umbrella European document for all Danube countries - European Union Strategy for the Danube Region. The implementation of an integrated approach, strategic framework, obligations and recommendations determined by the analyzed European and international strategic documents and conventions is especially important for improving the management of the spatial development of the Danube Region and Serbia as a whole. From that aspect, the paper recommends the necessary activities and facilities for harmonizing our strategic planning and management system and practice with the analyzed European documents concerning the Danube and Danube Region.

  4. Nucleotide diversity of Hemigrammus cf. marginatus (Characiformes, Characidae in the upper Paraná river floodplain - doi: 10.4025/actascibiolsci.v34i3.6669

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    Carla Simone Pavanelli

    2012-06-01

    Full Text Available Characidae is the largest and more diversified family from Characiformes and presents several classification problems, with several genera currently allocated as incertae sedis, such as the genus Hemigrammus. The upper Paraná river floodplain is an environment with high fish diversity. There is at least one species of Hemigrammus, however there are divergences among some authors about the number and the identification of the species from this genus. Therefore the goal of this study was to characterize, using a molecular approach, individuals of Hemigrammus from the upper Paraná river floodplain and to compare them with individuals from the type locality of Hemigrammus marginatus, since this is the only species distributed in this floodplain. For this, the DNA was extracted and a partial region from the mitochondrial genes ATPase 6 and ATPase 8 were amplified and sequenced. The results evidenced the existence of two species of Hemigrammus in the floodplain, although impossible to be distinguished only through morphological traits. High nucleotide diversity among individuals from the upper Paraná river in relation to those from the type locality was also observed, indicating that both species of Hemigrammus present in the upper Paraná river floodplain are not Hemigrammus marginatus. 

  5. Phytoplankton diversity in the Upper Paraná River floodplain during two years of drought (2000 and 2001

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    PAF. Borges

    Full Text Available Floodplain lakes and lotic environments of the High Paraná River floodplain present notable biodiversity, especially in relation to phytoplanktonic community. The goal of this work was to evaluate phytoplankton diversity (alpha, beta and gamma in three subsystems during two years of drought (2000 and 2001. We sampled 33 habitats at the pelagic zone subsurface during February and August. Due to low hydrometric levels of the Paraná and Ivinhema Rivers, there was no clear distinction between the potamophase and limnophase periods for the two hydrosedimentological cycles analysed. We recorded 366 taxa. The values obtained for gamma diversity estimators ranged from 55.5-87.8%. DCA and variance analyses revealed only spatial differences in the phytoplankton composition. The mean values of species richness, evenness and Shannon diversity were low, especially when compared to those obtained in previous periods for Baía subsystem. The highest mean values of species richness were verified in the connected floodplain lakes. The highest beta diversity was obtained from the Paraná subsystem and lotic environments in 2001. In general, we observed that the Upper Paraná River floodplain has the highest values of species richness, evenness and H' during the potamophase period, when the flood facilitates dispersion. However, this pattern was not observed in 2000 and 2001, years influenced by La Niña. Besides the low precipitation observed during that period, we must consider the influence of the Porto Primavera impoundment, which also altered the discharge regime of the Paraná River by decreasing the degree of connectivity between fluvial channels and the lentic environments of the floodplain. Thus, the prevalence of conditions characterising the limnophase during 2000 and 2001 explains the lack of significant variability registered for most components of phytoplankton diversity over the study period. We conclude that variations in phytoplankton diversity

  6. Phytoplankton diversity in the Upper Paraná River floodplain during two years of drought (2000 and 2001).

    Science.gov (United States)

    Borges, P A F; Train, S

    2009-06-01

    Floodplain lakes and lotic environments of the High Paraná River floodplain present notable biodiversity, especially in relation to phytoplanktonic community. The goal of this work was to evaluate phytoplankton diversity (alpha, beta and gamma) in three subsystems during two years of drought (2000 and 2001). We sampled 33 habitats at the pelagic zone subsurface during February and August. Due to low hydrometric levels of the Paraná and Ivinhema Rivers, there was no clear distinction between the potamophase and limnophase periods for the two hydrosedimentological cycles analysed. We recorded 366 taxa. The values obtained for gamma diversity estimators ranged from 55.5-87.8%. DCA and variance analyses revealed only spatial differences in the phytoplankton composition. The mean values of species richness, evenness and Shannon diversity were low, especially when compared to those obtained in previous periods for Baía subsystem. The highest mean values of species richness were verified in the connected floodplain lakes. The highest beta diversity was obtained from the Paraná subsystem and lotic environments in 2001. In general, we observed that the Upper Paraná River floodplain has the highest values of species richness, evenness and H' during the potamophase period, when the flood facilitates dispersion. However, this pattern was not observed in 2000 and 2001, years influenced by La Niña. Besides the low precipitation observed during that period, we must consider the influence of the Porto Primavera impoundment, which also altered the discharge regime of the Paraná River by decreasing the degree of connectivity between fluvial channels and the lentic environments of the floodplain. Thus, the prevalence of conditions characterising the limnophase during 2000 and 2001 explains the lack of significant variability registered for most components of phytoplankton diversity over the study period. We conclude that variations in phytoplankton diversity during the study

  7. Potencial for natural forest regeneration from seed bank in an upper Paraná river floodplain, Brazil

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    Campos João Batista

    2003-01-01

    Full Text Available The historical process of deforestation was analyzed to evaluate the regeneration potential of forests from soil seed bank of Porto Rico island (53° 15'W and 22° 45'S in the upper Paraná river floodplain. Remnant forest fragments were identified and measured and the structure of arboreous vegetation and the composition of the seed bank of the forests and grassland of the island were evaluated. Results showed a fast process of deforestation with critical levels of forest: the remaining twice fragments represented only 5.98% of the total surface of the island. Disturbance by cattle raised on the island continuously degraded the fragments (backward succession, while expansion of areas with pasture favored severe impoverishment of the seed banks flora. The latter factor, soil compaction, and characteristics of seeds of existing arboreous species in the bank suggested that the immediate reestablishment of vegetation was more conditioned to introduction processes of seeds (by rain and ''flood seed'' than by stock of seeds in the bank.

  8. Effects of flooding on ion exchange rates in an Upper Mississippi River floodplain forest impacted by herbivory, invasion, and restoration

    Science.gov (United States)

    Kreiling, Rebecca; DeJager, Nathan R.; Whitney Swanson,; Eric A. Strauss,; Meredith Thomsen,

    2015-01-01

    We examined effects of flooding on supply rates of 14 nutrients in floodplain areas invaded by Phalaris arundinacea (reed canarygrass), areas restored to young successional forests (browsed by white-tailed deer and unbrowsed), and remnant mature forests in the Upper Mississippi River floodplain. Plant Root Simulator ion-exchange probes were deployed for four separate 28-day periods. The first deployment occurred during flooded conditions, while the three subsequent deployments were conducted during progressively drier periods. Time after flooding corresponded with increases in NO3 −-N, K+ and Zn+2, decreases in H2PO4 −-P, Fe+3, Mn+2, and B(OH)4-B, a decrease followed by an increase in NH4 +-N, Ca+2, Mg+2 and Al+3, and an increase followed by a decrease for SO4 −2-S. Plant community type had weak to no effects on nutrient supply rates compared to the stronger effects of flooding duration. Our results suggest that seasonal dynamics in floodplain nutrient availability are similarly driven by flood pulses in different community types. However, reed canarygrass invasion has potential to increase availability of some nutrients, while restoration of forest cover may promote recovery of nutrient availability to that observed in reference mature forests.

  9. Flood Risk in the Danube basin under climate change

    Science.gov (United States)

    Schröter, Kai; Wortmann, Michel; del Rocio Rivas Lopez, Maria; Liersch, Stefan; Viet Nguyen, Dung; Hardwick, Stephen; Hattermann, Fred

    2017-04-01

    The projected increase in temperature is expected to intensify the hydrological cycle, and thus more intense precipitation is likely to increase hydro-meteorological extremes and flood hazard. However to assess the future dynamics of hazard and impact induced by these changes it is necessary to consider extreme events and to take a spatially differentiated perspective. The Future Danube Model is a multi-hazard and risk model suite for the Danube region which has been developed in the OASIS project. The model comprises modules for estimating potential perils from heavy precipitation, heat-waves, floods, droughts, and damage risk considering hydro-climatic extremes under current and climate change conditions. Web-based open Geographic Information Systems (GIS) technology allows customers to graphically analyze and overlay perils and other spatial information such as population density or assets exposed. The Future Danube Model combines modules for weather generation, hydrological and hydrodynamic processes, and supports risk assessment and adaptation planning support. This contribution analyses changes in flood hazard in the Danube basin and in flood risk for the German part of the Danube basin. As climate change input, different regionalized climate ensemble runs of the newest IPCC generation are used, the so-called Representative Concentration Pathways (RCPs). They are delivered by the CORDEX initiative (Coordinated Downscaling Experiments). The CORDEX data sample is extended using the statistical weather generator (IMAGE) in order to also consider extreme events. Two time slices are considered: near future 2020-2049 and far future 2050-2079. This data provides the input for the hydrological, hydraulic and flood loss model chain. Results for RCP4.5 and RCP8.5 indicate an increase in intensity and frequency of peak discharges and thus in flood hazard for many parts of the Danube basin.

  10. Further development and implementation of the DIWA distributed hydrological model-based integrated hydroinformatics system in the Danube River Basin for supporting decision making in water management

    Science.gov (United States)

    Szabó, J. A.; Réti, G. Z.; Tóth, T.

    2012-04-01

    developed integrated model has two basic pillars: the DIWA (DIstributed WAtershed) hydrologic, and the well-known HEC-RAS hydraulic models. The DIWA is a dynamic water-balance model that distributed both in space and its parameters, and which was developed along combined principles but its mostly based on physical foundations. According to the philosophy of the distributed model approach the catchment is divided into basic elements, cells where the basin characteristics, parameters, physical properties, and the boundary conditions are applied in the centre of the cell, and the cell is supposed to be homogenous between the block boundaries. The neighbouring cells are connected to each other according to runoff hierarchy (local drain direction). Applying the hydrological mass balance and the adequate dynamic equations to these cells, the result is a distributed hydrological model on a continuous, 3D gridded domain. For calculating the water level as well the HEC-RASS hydraulic model has been embedded into DIWA model. In this integration the DIWA model provides the upper boundary conditions for HEC-RAS, and then HEC-RAS provides the water levels along the lowland parts of the river-network. In this presentation, our recently developed integrated hydroinformatics system and its implementation for the middle-upper part of the Danube River Basin will be reported. Following an outline of the backgrounds, an overview on the DIWA and the integrated model-system will be given. The implementation of this integrated hydroinformatics system in the Danube River Basin will also be presented, including a summary of the developed 1km resolution geo-dataset for the modelling. Then some demonstrative results of the use of the pre-calibrated system will be discussed. Finally, an outline of the future steps of the development will be discussed.

  11. DANUBE SALMON (HUCHO HUCHO L.. THEMATIC BIBLIOGRAPHY

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    I. Hrytsynyak

    2015-09-01

    Full Text Available Purpose. Creating of the thematic bibliographic list of publications dedicated to ecological and zoogeographical, morphological and biological, physiological, biochemical and genetic characteristics of the Danube salmon, as well as to its cultivation in Ukraine and abroad. Methodology. In the process of systematic search complete and selective methods were applied. The bibliographic core have been formed by the literature from the fund of scientific library of the Institute of Fisheries NAAS. Findings. There was composed the thematic list of publications in a quantity of 100 sources, containing characteristics of Danube salmon as representative of salmonids. Literary sources was arranged in alphabetical order by author or title, and described according to DSTU 7.1:2006 «System of standards on information, librarianship and publishing. Bibliographic entry. Bibliographic description. General requirements and rules», as well as in accordance with the requirements of APA style – international standard of references. Practical value. The list may be useful for scientists, practitioners, students, whose area of interests covers the questions of breeding, and researching of the salmon biological features.

  12. Upper Mississippi River Floodplain water quality for Keithsburg Division, Illinois, Mark Twain National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Biologists from the U.S. Fish and Wildlife Service surveyed environmental quality at a backwater system of the Upper Mississippi River between 1994 and 1996. The...

  13. Age, growth and mortality of Clarias gariepinus (Siluriformes: Clariidae) in the Mid-Cross River-Floodplain ecosystem, Nigeria.

    Science.gov (United States)

    Okogwu, Okechukwu Idumah

    2011-12-01

    Clarias gariepinus is a threatened highly prized species used for some elite ceremonies by the local communities. Artisanal fishers take advantage of this species annual breeding migration from the lower Cross River to the floodplain lakes in Mid-Cross River during the rainy season, and some migrant stocks are not able to spawn. Since there is a lack of information on this species population dynamics in the Mid-Cross area, this study aimed to evaluate the age, growth and mortality to support the development of effective management plans. For this, monthly overnight gill net catches (from 6 to 72mm mesh sizes) were developed between March 2005 and February 2007. Growth parameters were determined using the FiSAT II length-frequency distribution. A total of 1 421 fish were collected during the survey. The asymptotic growth (L(infinity)) was 80.24cm, growth rate (K) was 0.49/year while the longevity was 6.12 years. The annual instantaneous rate of total mortality (Z) was 2.54/year and the natural mortality (M) was 0.88. Fishing mortality (1.66/year) was higher than the biological reference points (F(opt) = 0.83 and F(limit) = 1.11) and the exploitation rate (0.66) was higher than the predicted value (E(max) = 0.64) indicating that C. gariepinus was over exploited in the Mid-Cross River-Floodplain ecosystem. Some recommended immediate management actions are to strengthen the ban of ichthyocide fishing, closure of the floodplain lakes for most of the year, restricted access to the migratory path of the fish during the flood period and vocational training to the fishers. In order to recover and maintain a sustainable harvest, I suggest that a multi-sector stakeholder group should be formed with governmental agents, community leaders, fishers, fisheries scientists and non-governmental organizations. These short and long term measures, if carefully applied, will facilitate recovery of the fishery.

  14. Feeding of Eigenmannia trilineata (Pisces, Sternopygidae (Lopez & Castello, 1966, in the upper Paraná River floodplain, Brazil

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    Danielle Peretti

    1999-01-01

    Full Text Available Studies were performed on various aspects related to the feeding of Eigenmannia trilineata in the upper Paraná River floodplain, from June 1993 to July 1994, at four places with different types of bottom and waters speed. A number of 279 fish had its stomachal contents analyzed by occurence and point methods in which it was applied on its frequencies the feeding index. Two hundred an sixty two specimens were utilized to the analysis of the feeding activity that it was based on frequency and middle degree of stomach repletion. For the morfological analyse utilized 12 individuals. It was verified fourteen items on species diet which it was found chiefly Chironomidae (Diptera and detritus. Seasonal, area variations were verified in feeding activity and the participation of constituent items in diet. The results showed that the species presents nightly and benthophagous habits, with morfological characters of the carnivorous species.Os estudos foram realizados sob vários aspectos relacionados à alimentação de Eigenmannia trilineata na planície de inundação do alto rio Paraná, de junho de 1993 a julho de 1994 em quatro locais com diferentes tipos de fundo e velocidade de águas. Um número de 279 peixes tiveram seus estômagos analisados pelos métodos de ocorrência e pontos sendo aplicado sobre suas frequências o índice alimentar. Duzentos e sessenta e dois indivíduos foram utilizados para a análise da atividade alimentar, a qual foi baseada sobre a freqüência e grau de repleção médio dos estômagos. Para a análise morfológica foram utilizados 12 indivíduos. Foi verificado 14 itens na dieta da espécie, encontrando-se principalmente Chironomidae (Diptera e detritos. Variações sazonais e de área foram verificados na atividade alimentar e na participação dos itens constituintes da dieta. Os resultados mostraram que a espécie apresenta hábitos noturno e bentófago, com características morfológicas de espécies carnívoras.

  15. Age, growth and mortality of Clarias gariepinus (Siluriformes: Clariidae in the Mid-Cross River-Floodplain ecosystem, Nigeria

    Directory of Open Access Journals (Sweden)

    Okechukwu Idumah Okogwu

    2011-12-01

    Full Text Available Clarias gariepinus is a threatened highly prized species used for some elite ceremonies by the local communities. Artisanal fishers take advantage of this species annual breeding migration from the lower Cross River to the floodplain lakes in Mid-Cross River during the rainy season, and some migrant stocks are not able to spawn. Since there is a lack of information on this species population dynamics in the Mid-Cross area, this study aimed to evaluate the age, growth and mortality to support the development of effective management plans. For this, monthly overnight gill net catches (from 6 to 72mm mesh sizes were developed between March 2005 and February 2007. Growth parameters were determined using the FiSAT II length-frequency distribution. A total of 1 421 fish were collected during the survey. The asymptotic growth (L∞ was 80.24cm, growth rate (K was 0.49/year while the longevity was 6.12years. The annual instantaneous rate of total mortality (Z was 2.54/year and the natural mortality (M was 0.88. Fishing mortality (1.66/year was higher than the biological reference points (Fopt=0.83 and Flimit=1.11 and the exploitation rate (0.66 was higher than the predicted value (Emax=0.64 indicating that C. gariepinus was over exploited in the Mid-Cross River-Floodplain ecosystem. Some recommended immediate management actions are to strengthen the ban of ichthyocide fishing, closure of the floodplain lakes for most of the year, restricted access to the migratory path of the fish during the flood period and vocational training to the fishers. In order to recover and maintain a sustainable harvest, I suggest that a multi-sector stakeholder group should be formed with governmental agents, community leaders, fishers, fisheries scientists and non-governmental organizations. These short and long term measures, if carefully applied, will facilitate recovery of the fishery. Rev. Biol. Trop. 59 (4: 1707-1716. Epub 2011 December 01.

  16. THE HIDROLOGICAL RELATIONSHIP BETWEEN DANUBE ARMS AND LAKE COMPLEXIS IN THE DANUBE DELTA

    Directory of Open Access Journals (Sweden)

    Basarab Victor DRIGA

    2008-06-01

    Full Text Available The Danube Delta, which is an open system, is permanently exchanging matter and energy with the external environment. The hydrological sub-system, basically the water circulation represents the vital component of the existence of the delta space. In view of the ecological requirements of this delta space, of the present and prospective situation of various managements, of the present legal framework and the future of the Danube Delta Biosphere Reserve, it is advisable to make some changes to the water circulation system within the Letea unit as follows: to close down or undersize the Mila 35 Canal and the Mila 22 Canal, to reduce the Crânjală Canal flow section or close the canal, to secure the ecological reconstruction of inefficient dammed enclosures (e.g. Pardina by ensuring normal water circulation inside them, to reopen the Sireasa Canal at its junction with the Chilia Arm. The fact is that the water circulation system throughout the Caraorman unit will suffer essential changes, so that is recommendable to: revitalise the Litcov Canal and close the Filat canal, downsize the Crişan-Caraorman flow section, open up the Gorgova and Ceamurlia canals, revigorate the Ivancea and the Erenciuc canals (between the Puiu and the Erenciuc lakes, respectively, make 2 – 3 openings in the littoral dam and in the Împuţita Backwater, placing the weir level at + 70-80 cm, in order to facilitate the depression water outflow into the sea.

  17. Age, growth and mortality of Clarias gariepinus (Siluriformes: Clariidae in the Mid-Cross River-Floodplain ecosystem, Nigeria

    Directory of Open Access Journals (Sweden)

    Okechukwu Idumah Okogwu

    2011-12-01

    Full Text Available Clarias gariepinus is a threatened highly prized species used for some elite ceremonies by the local communities. Artisanal fishers take advantage of this species annual breeding migration from the lower Cross River to the floodplain lakes in Mid-Cross River during the rainy season, and some migrant stocks are not able to spawn. Since there is a lack of information on this species population dynamics in the Mid-Cross area, this study aimed to evaluate the age, growth and mortality to support the development of effective management plans. For this, monthly overnight gill net catches (from 6 to 72mm mesh sizes were developed between March 2005 and February 2007. Growth parameters were determined using the FiSAT II length-frequency distribution. A total of 1 421 fish were collected during the survey. The asymptotic growth (L∞ was 80.24cm, growth rate (K was 0.49/year while the longevity was 6.12years. The annual instantaneous rate of total mortality (Z was 2.54/year and the natural mortality (M was 0.88. Fishing mortality (1.66/year was higher than the biological reference points (Fopt=0.83 and Flimit=1.11 and the exploitation rate (0.66 was higher than the predicted value (Emax=0.64 indicating that C. gariepinus was over exploited in the Mid-Cross River-Floodplain ecosystem. Some recommended immediate management actions are to strengthen the ban of ichthyocide fishing, closure of the floodplain lakes for most of the year, restricted access to the migratory path of the fish during the flood period and vocational training to the fishers. In order to recover and maintain a sustainable harvest, I suggest that a multi-sector stakeholder group should be formed with governmental agents, community leaders, fishers, fisheries scientists and non-governmental organizations. These short and long term measures, if carefully applied, will facilitate recovery of the fishery. Rev. Biol. Trop. 59 (4: 1707-1716. Epub 2011 December 01.Clarias gariepinus es una

  18. Floodplain Sedimentation in Vegetated Areas of the Elwha River Floodplain, 2012-2014

    Science.gov (United States)

    Lauer, J. W.; Polka, J.

    2014-12-01

    field-based sedimentation measurements and to develop a reach-wide estimate of overall fine sediment accumulation on the floodplain. Our CAESAR runs, which are performed for the entire post-dam removal period, produce rich 2-D representations of velocity and bed texture that should be useful to other researchers studying this system.

  19. Geomorphic and vegetation processes of the Willamette River floodplain, Oregon: current understanding and unanswered science questions

    Science.gov (United States)

    Wallick, J. Rose; Jones, Krista L.; O'Connor, Jim E.; Keith, Mackenzie K.; Hulse, David; Gregory, Stanley V.

    2013-01-01

    decrease bed-material supply by an unknown amount because they limit bank erosion and entrainment of stored sediment. The rivers, geomorphic floodplain, and vegetation within the study area have changed noticeably in response to the alterations in floods and coarse sediment and wood transport. Widespread decreases have occurred in the rates of meander migration and avulsions and the number and diversity of landforms such as gravel bars, islands, and side channels. Dynamic and, in some cases, multi-thread river segments have become stable, single-thread channels. Preliminary observations suggest that forest area has increased within the active channel, further reducing the area of unvegetated gravel bars. Alterations to floods and sediment transport and ongoing channel, floodplain, and vegetation responses result in a modern Willamette River Basin. Here, the floodplain influenced by the modern flow and sediment regimes, or the functional floodplain, is narrower and inset with the broader and older geomorphic floodplain. The functional floodplain is flanked by higher elevation relict floodplain features that are no longer inundated by modern floods. The corridor of present- day active channel surfaces is narrower, enabling riparian vegetation to establish on formerly active gravel bar surfaces. The modern Willamette River Basin with its fundamental changes in the flood, sediment transport, and large wood regimes has implications for future habitat conditions. System-wide future trends probably include narrower floodplains and a lower diversity of landforms and habitats along the Willamette River and its major tributaries compared to historical patterns and today. Furthermore, specific conditions and future trends will probably vary between geologically stable, anthropogenically stable, and dynamic reaches. The middle and lower segments of the Willamette River are geologically stable, whereas the South Santiam and Middle Fork Willamette Rivers were historically dynamic, but

  20. Improving the Performance of Enterprises from Danube Riveran Countries, through the Implementation of a Quality Management System

    Directory of Open Access Journals (Sweden)

    Irina Todos

    2012-08-01

    Full Text Available A major commitment and objective in the conditions of a market economy is to improve thequality of production, with a special emphasis on increasing the efficiency of economic activity to meetthe production and consumption requirements. A permanent competition on both domestic and international markets has challenged companies to continuously ensure the high quality of their products, in order to meet social needs. The advantages from improving the commodities quality are reflected in an increased labour productivity, reduced production costs, increased profitability. Currently, many companies are particularly interested in the quality assurance models as proposed by international standards of ISO 9000, ISO 14000, ISO 22000, OSHAH 18000, etc. Some of these companies have already a certified quality management system based on these standards. They consider that the qualitysystem certification has a positive impact on business performance, acknowledging at the same time, the far-reaching importance of continuous improvement and implementation of this system, the principles of total quality management to ensure a successful performance in the competition.

  1. Flower morphology, nectar features, and hummingbird visitation to Palicourea crocea (Rubiaceae in the Upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    Luciana B. Mendonça

    2006-03-01

    Full Text Available We investigated flower morphology, nectar features, and hummingbird visitation to Palicourea crocea (Rubiaceae, a common ornithophilous shrub found in the riparian forest understory in the Upper Paraná River floodplain, Brazil. Flowers are distylous and the style-stamen dimorphism is accompanied by other intermorph dimorphisms in corolla length, anther length, and stigma lobe length and form. We did not observe strict reciprocity in the positioning of stigma and anthers between floral morphs. Flowering occurred during the rainy season, October to December. Nectar standing crop per flowerwas relatively constant throughout the day, which apparently resulted in hummingbirds visiting the plant throughout the day. Energetic content of the nectar in each flower (66.5J and that required daily by hummingbird visitors (up to 30kJ would oblige visits to hundreds of flowers each day, and thus movements between plants that should result in pollen flow. Three hummingbird species visited the flowers: the Gilded Sapphire (Hylocharis chrysura, the Black-throated Mango (Anthracothorax nigricollis, and the Glittering-bellied Emerald (Chlorostilbon aureoventris. The frequency of hummingbird visitation, nectar features, and the scarcity of other hummingbird-visited flowers in the study area, indicate that P. crocea is an important nectar resource for short-billed hummingbirds in the study site.Investigamos a morfologia floral, as características do néctar e a visita de beija-flores a Palicourea crocea (Rubiaceae, uma espécie ornitófila arbustiva comumente encontrada no sub-bosque da vegetação ripária na planície de inundação do Alto Rio Paraná, Brasil. As flores são distílicas, sendo o dimorfismo estilete-estames acompanhado por outras variações morfológicas no comprimento da corola, altura das anteras, comprimento das anteras e comprimento e forma das papilas estigmáticas. Não foi observada reciprocidade estrita na posição dos estigmas e

  2. The Shipping Register of Ukraine on the Danube River

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    Oleg Shevchuk

    2013-08-01

    Full Text Available The article deals with the prehistory, goals and activities of the Shipping Register of Ukraine on the Danube River. It illustrates the main functions, the rights and law support of the organization, which can ensure the safety of shipping. The Shipping Register of Ukraine always tends to a constant and greater customer satisfaction in its work and continual improvement of the effectiveness of its internal quality control system.

  3. Understanding the Otherness in the Danube Region

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    Juliana Popova

    2016-08-01

    Full Text Available The aim of this paper is to discuss the attitudes towards the Otherness in the Danube region. A monograph dedicated to the notions about the Otherness in Bulgaria. Theoretical clarification of the nature and types of Otherness in general and finding its expression in the public opinion within the Danube region. The general conclusion drawn in the paper is that the citizens of the Danube countries have different attitudes towards the “own”, indigenous otherness and external, exogenous otherness due to the complicated political situation, linked with the transnational migration. The paper results can serve as a preliminary basis for various studies in the field of ethnicity, gender equality, problems of disadvantaged people, etc. The study will contribute to better understanding of the Otherness as one of the most sensitive problems of the contemporary societies and will shed light on this matter in the Danube countries.

  4. Vertical distribution of 137Cs in alluvial soils of the Lokna River floodplain (Tula oblast) long after the Chernobyl accident and its simulation

    Science.gov (United States)

    Mamikhin, S. V.; Golosov, V. N.; Paramonova, T. A.; Shamshurina, E. N.; Ivanov, M. M.

    2016-12-01

    Profiles of vertical 137Cs distribution in alluvial meadow soils on the low and medium levels of the Lokna River floodplain (central part of the Plavsk radioactive spot in Tula oblast) 28 years after the Chernobyl fallout have been studied. A significant increase in the 137Cs pool is revealed on the low floodplain areas compared to the soils of interfluves due to the accumulation of alluvium, which hampers the reduction of the total radionuclide pool in alluvial soils because of radioactive decay. The rate of alluvium accumulation in the soil on the medium floodplain level is lower by three times on average. An imitation prognostic model has been developed, which considers the flooding and climatic conditions in the region under study. Numerical experiments have quantitatively confirmed the deciding role of low-mobile forms in the migration of maximum 137Cs content along the soil profile in the absence of manifested erosion-accumulation processes.

  5. Digenea, Nematoda, Cestoda, and Acanthocephala, parasites in Potamotrygonidae (Chondrichthyes from the upper Paraná River floodplain, states of Paraná and Mato Grosso do Sul, Brazil.

    Directory of Open Access Journals (Sweden)

    Pavanelli, G. C.

    2008-01-01

    Full Text Available The present paper represents the first study on the endoparasitic fauna of Potamotrygon falkneri and P.motoro in the upper Paraná River floodplain. Fishes were collected by fishing rod and gillnetting in different stations ofthe floodplain, from March, 2005 to September, 2006. Parasites were sampled, fixed and preserved according tospecialized literature. About half of the analyzed fish were parasitized by at least one of the following species ofendoparasites: Clinostomum complanatum, Genarchella sp. and Tylodelphys sp. (metacercaria (Digenea;Acanthobothrium regoi, Rhinebothrium paratrygoni, Paroncomegas araya and Potamotrygonocestus travassosi(Cestoidea; Brevimulticaecum sp. (larva, Cucullanus sp., Echinocephalus sp. and Spinitectus sp. (Nematoda; andQuadrigyrus machadoi (Acanthocephala. Some species were already registered in Chondrichthyes and others werepreviously recorded in Osteichthyes from the study area. The study listed ten new records of parasites in the host P.falkneri, one new record in the host P. motoro and five new records in the locality upper Paraná River.

  6. Danube: Future – A Promising Path to Connecting the Danube Region

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    Juliana Popova

    2016-08-01

    Full Text Available The aim of this paper is to present the participation and involvement of the University of Ruse in the Danube: Future Project for sustainable development of the Danube Region. A white paper on integrated sustainable development of the Danube River Basin produced by representatives of Danube Rectors’ Conference and Alps-Adriatic Conference member universities. Case study of the participation of the University of Ruse in the 3 editions of the DIANET International School, the 1st Danube:Future Workshop, and in the Management Committee of the Project. The general conclusion drawn in the paper is that the Danube:Future project has allowed the University of Ruse to be more engaged in the scientific development in the Danube Region, and has improved its visibility among other universities and stakeholders. The paper results can serve as a motivation for other researchers and universities to join the project and contribute to its growing Knowledge Base. The study will contribute to finding new paths for developing research in the Danube Region by making the environmental and cultural heritage of the DRB visible and bringing it into the context of sustainable development.

  7. The Serbian Danube region as tourist destination

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    Lukić Dobrila

    2015-01-01

    Full Text Available The aim of this paper is to show the advantages and disadvantages of the Serbian Danube Region as a tourist destination. Tasks to be completed in order to achieve the set aim include: determining the position of the Serbian Danube Region from the perspective of transportation geography, identifying its natural and anthropogenic tourism assets, its tourism infrastructure, as well as the types of tourism that can develop there based on the above. The methods used in this paper comprise: the cartographic method; a statistical method used for determining monthly and annual mean values of the Danube water level, water temperature and climatic elements for the period 1991-2010, the number of tourists and overnights in the Danube Region in 2012, as well as the number of accommodation facilities and their comparison for the years 2010 and 2012; the analytic and synthetic method; the fieldwork method combined with the photographic method, etc. The only conclusion that can be drawn is that the potentials of the Serbian Danube Region for tourism development have not been sufficiently valorised or realised except in Belgrade and Novi Sad. Therefore, taking action and measures in connection with sustainable development of tourism would favour economic development outside major cities, advance the spatial distribution of population and improve the overall social situation.

  8. Hydro blues on the Danube

    Energy Technology Data Exchange (ETDEWEB)

    Kovac, C.

    1997-03-24

    Armed with more than 10,000 pages of documents, Hungarian government representatives presented opening arguments earlier this month in a suit with neighboring Slovakia over environmental, financial and political impacts of a $2-billion hydroelectric project on the Danube River. The two countries` 20-year discord over the Gabcikovo-Nagymaros project has reached a new plateau in the legal battle now before the International Court of Justice in The Hague, The Netherlands. Following a two-week recess that began March 10, the court is set to hear arguments from Slovakia. The trial is expected to take six weeks, and will include an on-site inspection of the now-completed project by judges. The project includes a 15.5-mile-long diversion canal and a 720-Mw hydroelectric dam and power plant at Gabcikovo, now in Slovakia. Downstream in Hungary, Nagymaros Dam, with a 160-Mw powerplant, was to be built to halt surges from Gabcikovo. Hungary opted not to build the project.

  9. Contributions to the knowledge of the Danube waters impact on the Black Sea

    Science.gov (United States)

    Gomoiu, Marian-Traian; Oaie, Gheorghe; Secrieru, Dan; Vasiliu, Dan; Begun, Tatiana; Caraus, Ioan

    2013-04-01

    Rivers usually have a positive impact on marine areas where they discharge their waters, fertilizing them and supporting high biological productivity, the Danube River being a good example in this respect. Given the conditions of chaotic industrialization and the discharge into rivers of many chemicals, some of high toxicity, the eutrophication influence changed its beneficial nature, turning into a toxic polluting influence, with catastrophic effects on the structure and functioning of coastal ecosystems, which is a situation well-known and in the area of the Danube mouths for the period 1970-1990. After 1990, under major political changes in socio-economic systems, the environmental pressures with impact on marine coastal ecosystems diminished; these pressures had been maintained by hydrological systems opening to the marine areas. What is the current situation of these pressures? What are the major characteristics of the organisms associations under the direct influence of the Danube? In this paper, the authors try to give some answers to these questions. In the framework of the lower Danube monitoring program, conducted by GeoEcoMar during 2009-2012, measurements were made and samples collected in more than 230 stations along the Romanian sector of the Danube River. The main aspects related to the ecological state of the River were: - Physico-chemical and biological (phytoplankton); - Sediment granulometry and inorganic chemistry - CaCO3, Fe2O3, TiO2, Zr, Ba, Rb, Zn, Ni, MnO, Cr, V, Co, Pb; - Ammonia, TOC, total cyanide, organochlorine pesticides in sediments; - Physico-chemical analyses of water samples. According to the results, the areas suspected of pollution from anthropogenic sources and also from other activities, could be outlined as follows: - The stretch between km 1072 (Danube entry to Romania) and km 1039 - downstream the mining sector Moldova Veche; - Sector between km 957-947, near the Iron Gates I dam; - Danube - Black Sea Canal (the NPP

  10. Use of LANDSAT data for resources investigation in the lower basin of Danube and Danube Delta

    Science.gov (United States)

    Oprescu, N. (Principal Investigator)

    1975-01-01

    The author has identified the following significant results. A most important is that bands 4 and 5 very clearly show the sedimentary discharge into the sea and the spreading regime in the sea at the mouth of the Danube and out at sea at great distances to over 100 km. Another particularly significant result is shown by bands 6 and 7, presenting the successive stages of sediments in the Danube Delta, with the clear marking of the separation between the fluvial and marine delta. The survey of floods and of some of their effects may also be studied on all of the bands in the complex area of the Danube Delta and in the lower basin of the Danube.

  11. Linking hydro-morphology with invertebrate ecology in diverse morphological units of a large river-floodplain system

    CSIR Research Space (South Africa)

    Blettler, MCM

    2016-12-01

    Full Text Available study were 1) to determine changes in invertebrate community due to hydrological stages, 2) to link local physical features [flow configuration, sediment composition and morphological feature) with the ecological structure between and within dissimilar...

  12. The evaluation of the development of the Danube-Morava corridor traffic network

    Directory of Open Access Journals (Sweden)

    Vemić Mirčeta R.

    2004-01-01

    Full Text Available Traffic has the primary influence on the development of the Danube-Morava Corridor as a specific natural, geographically determined and stochastic-functional territorial system. The traffic network of roads railway lines and waterways along this corridor is at the very core of the Trans-European Transport Corridor 10, representing its most dynamic, most congested and highest-traffic section. The influence, namely the creative power of traffic, largely depends on the degree of development modernization and maintenance of the network. This work presents the assessment of the development of the Danube-Morava Corridor traffic network.

  13. Spatial and temporal distribution of larvae and juveniles of Hoplias aff. malabaricus (Characiformes, Erythrinidae in the Upper Paraná River floodplain, Brazil

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    A. BIALETZKI

    Full Text Available Spatial and temporal distribution of larvae and juveniles of trahira, Hoplias aff. malabaricus (Erythrinidae, and their relationship with environmental parameters in the Upper Paraná River floodplain were analyzed. Sampling of larvae and juveniles of H. aff. malabaricus has been conducted during the period from November 1991 through February 1995, with 42 sampling stations distributed in four sub-areas: Ivinhema I, Ivinhema II, Baía, and Paraná. During the same period, data were obtained for water temperature, dissolved oxygen, pH, electrical conductivity, river level, precipitation index, and photoperiod. The largest catches of larvae were in the Ivinhema I sub-area (47.06%, and of juveniles in the Paraná sub-area (54.55%. Larvae and juveniles were caught from October to February. Larvae were mainly collected at night and in all types of environments sampled (lotic, semi-lotic, and lentic. Principal Component Analysis of the environmental parameters and larval density showed that the largest catches were obtained in dry season months, with low values for temperature, electrical conductivity, river level, and photoperiod, and with high concentrations of dissolved oxygen and pH. This reproductive strategy may minimizes predation and maximizes food utilization, as it enables the fish to reach advanced developmental stages, while most other species are spawning.

  14. Spatial and temporal distribution of larvae and juveniles of Hoplias aff. malabaricus (Characiformes, Erythrinidae in the Upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    BIALETZKI A.

    2002-01-01

    Full Text Available Spatial and temporal distribution of larvae and juveniles of trahira, Hoplias aff. malabaricus (Erythrinidae, and their relationship with environmental parameters in the Upper Paraná River floodplain were analyzed. Sampling of larvae and juveniles of H. aff. malabaricus has been conducted during the period from November 1991 through February 1995, with 42 sampling stations distributed in four sub-areas: Ivinhema I, Ivinhema II, Baía, and Paraná. During the same period, data were obtained for water temperature, dissolved oxygen, pH, electrical conductivity, river level, precipitation index, and photoperiod. The largest catches of larvae were in the Ivinhema I sub-area (47.06%, and of juveniles in the Paraná sub-area (54.55%. Larvae and juveniles were caught from October to February. Larvae were mainly collected at night and in all types of environments sampled (lotic, semi-lotic, and lentic. Principal Component Analysis of the environmental parameters and larval density showed that the largest catches were obtained in dry season months, with low values for temperature, electrical conductivity, river level, and photoperiod, and with high concentrations of dissolved oxygen and pH. This reproductive strategy may minimizes predation and maximizes food utilization, as it enables the fish to reach advanced developmental stages, while most other species are spawning.

  15. Nagymaros power station on the River Danube

    Energy Technology Data Exchange (ETDEWEB)

    Kobilka, J.

    1987-02-01

    This article deals with the economic aspects of Austrian cooperation in power station construction as practised in the consulting activities of Oesterreichische Donaukraftwerke AG, and discusses in detail this company's participation in the construction of the main structure for the Nagymaros power station on the Danube under a general contract.

  16. Perinatal health in the Danube region

    DEFF Research Database (Denmark)

    Knudsen, Lisbeth E.; Andersen, Zorana J.; Sram, Radim J.

    2017-01-01

    In 2013-2015, a consortium of European scientists - NEWDANUBE - was established to prepare a birth cohort in the Danube region, including most of the countries with the highest air pollution in Europe, the area being one-fifth of the European Union's (EU's) territory, including 14 countries (nine...

  17. FISHERY MANAGEMENT IN THE DANUBE CATCHMENT AREA

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    Tomislav Treer

    1999-12-01

    Full Text Available There are three successive regions of the Danube, each of which has to deal with its own problems in fisheries. Sport fishing and ecological recontruction problem matters predominate in the upper flow. These problems also characterize the middle flow, where to a certain extent, commercial fishery is coming into view, while the lower flow has to deal with commercial fishery problems to full extent. The difference is not so much due to the morphometry as to the development and state of the economy of the countries in the river basin, their legislation on fishery and the manner in which the legislation is applied. Numerous dams of the upper flow of the Danube (29 in Germany, 9 in Austria, influence significantly the ichthyocenoses. An extreme example of that is Gabčikovo dam at the Slovak-Hungarian border where fish catch decreased to one fourth. In the lower segment of the Danube fish catch falls down to one third and is followed, by a drastically negative change of fish species composition. The records show that highly valued species as sturgeons, pike and tench are in drastic decline over the last few years. The changes were caused by physical barriers, like dams and weirs, by water pollution, by increasing concentration of nutrients and heavy metals, by poaching and by overexploitation. For all those alarming reasons, some legal interventions in commercial fishery must be undertaken. In the middle flow, where the Danube flows through Croatian territory, there have also been declining trends of bentivore and phytophyl species respectively. The law supports the coexistence of sport and commercial fishery in this area and although sport fishing should be given the advantage, commercial fishing should be rigorously supervised and allowed only when there is a naturally produced surplus. Because of fish migrations and political frontiers of Danube area, it is essential that the neighboring countries coordinate their efforts in managing fisheries

  18. Modelling the coastal processes at the mouths of the Danube River in the Black Sea

    Science.gov (United States)

    Rusu, Eugen; Zanopol, Andrei

    2014-05-01

    The mouths of the Danube River in the Black Sea represent the main southern entrance in the seventh Pan European transportation corridor that links the Black and the Northern seas and is the most important inland navigable waterway in Europe. For this reason the coastal area close to the Danube Delta is subjected to high navigation traffic, which is crucially affected by the strong processes mainly induced by the interactions between the waves and the currents generated by the Danube River outflow. From this perspective, the objective of the present work is to develop a computational framework based on numerical models able to evaluate properly the effects of these interactions and to provide reliable predictions concerning the wave and current conditions corresponding to various environmental patterns. Following this target, a wave modelling system, SWAN based, was implemented in the entire basin of the Black Sea and focused on the coastal sector at the entrance of the Danube Delta. As a next step of the modelling process, SWAN simulations were performed at two different computational levels, considering in parallel the situations without and with the current fields for the main environmental conditions characteristic to the target area. The first level covers the entire coastal area at the mouths of the Danube River and has a resolution in the geographical space of 500m. The second is a computational domain with the resolution of 50m that is focused on the Sulina channel, which is the main navigation gate at the mouths of the Danube River. The results show that the presence of the currents induces relevant enhancements in terms of significant wave heights. Additionally, the Benjamin Feir index (BFI) was also evaluated. This is a spectral shape parameter that is related to the kurtosis of the distribution and indicates the risk of the freak wave occurrence. The enhanced values for BFI in the case when the current fields are considered in the modelling process

  19. Education and Training Needs in the Field of Logistic Structures and Services in the Lower Danube Region

    Directory of Open Access Journals (Sweden)

    Mihai Felea

    2010-11-01

    Full Text Available The approach of the subject concerning the training of specialists in the domain of logistic structures and services in the region of the inferior Danube is enlisted within a larger context, the Strategy of the Danube, but also in a more restrained one, the Program of Cross-Border Cooperation Romania – Bulgaria, 2007-2013. The Strategy of the Danube represents a project initiated in the year 2008 by Germany, Austria and Romania to which subsequently there adhered the other states on the Danube and which became a program of the European Commission. It shall have allotted a budget of 50 milliards euro until the year 2013. It shall be preponderantly addressed to the population in the Danube Basin, which is estimated at 115 millions, following to be developed through cross-border projects. In December 2010 there is foreseen the approval of the Action Plan for the program the Strategy of the Danube by the European Commission. The integration process needs premises and conditions for further development. One of them is the connectivity and it supporting system – the logistics. The problem of the connectivity is one of the pillars of the Danube strategy, which could play an important role in the Lower Danube Macro region’s development. Those problems need different approaches, specialized research and training. The situation of the two countries in the domain of fluvial logistics may be characterized as unsatisfactory in relation to their potential. At the present moment there is a single bridge which connects the two countries (Giurgiu – Ruse and several travels with the passage boat. The harbour infrastructures are old and inefficient. There are no modern multi-modal platforms or a coherent vision in their design. The transportation on the Danube is insufficiently exploited. As well, the river is not capitalized in other domains, too: agriculture, pisciculture, energy, ecology, tourism, arrangement of the territory, etc. Within a more

  20. Temporal-spatial patterns of intestinal parasites of the Hooded Crane (Grus monacha) wintering in lakes of the middle and lower Yangtze River floodplain

    Institute of Scientific and Technical Information of China (English)

    Wei Huang; Lizhi Zhou; and Niannian Zhao

    2014-01-01

    Background:Parasites have adverse effects on the life and survival of many migratory waterbirds, especially birds on the endangered species list. Hooded Cranes are large migratory colonial waterbirds wintering in wetlands, which are prone to parasite infection, thus monitoring the diversity of parasites is important for sound wetland management and protection of this species. Methods:From November 2012 to April 2013, we collected 821 fresh faecal samples from the three lakes (Poyang, Caizi and Shengjin Lake) in the lower and middle Yangtze River floodplain, and detected with saturated brine floating and centrifugal sedimentation methods. Parasite eggs were quantified with a modified McMaster’s counting method. Results:In this study, 11 species of parasites were discovered, i.e., two coccidium (Eimeria gruis, E. reichenowi), five nematodes (Capil aria sp., Strongyloides sp., Ascaridia sp., Trichostrongylus sp., Ancylostomatidae), three trematodes (Echinostoma sp., Echinochasmus sp., Fasciolopsis sp.) and one cestode (Hymenolepis sp.). About 57.7%of the faecal samples showed parasitic infection. All species of parasites were found at the three sites except Hymenolepis which was not found at Poyang Lake. While most samples were affected by only one or two species of parasites, infection by Eimeria spp. was the most common (53.1%). From One-Way ANOVA analysis of the three lakes, parasite species richness index (p = 0.656), diversity index (p = 0.598) and evenness index (p = 0.612) showed no significant difference. According to the statistical analysis of our data, there were no significant difference in parasite species richness index (p = 0.678) and evenness index (p= 0.238) between wintering periods, but a strong difference in diversity index (p Conclusions:Our study suggests that in the wintering Hooded Crane populations, parasite diversity is more sensitive to changes in the overwintering periods than to locations. This also indicates that with the limitations of

  1. Interannual variability of phytoplankton in the main rivers of the Upper Paraná River floodplain, Brazil: influence of upstream reservoirs

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    LC. Rodrigues

    Full Text Available The interannual variation of phytoplankton communities in the three main rivers of the Upper Paraná River floodplain is evaluated in relation to changes in the hydrosedimentological regime. These changes are a result of climatic variability and the formation of Porto Primavera Reservoir, located at the upper Paraná River. Phytoplankton species richness and density were investigated in rivers during a prior period (1993-1994 and eight years after reservoir impoundment (2000-2007. Multiple analyses were conducted to test the differences between these time periods in order to find predictor variables for phytoplankton attributes. A total of 454 phytoplanktonic taxa were found. The regression analysis revealed significant differences between periods. In the years following construction of the Porto Primavera dam, species richness was lower in the Paraná River and density was higher in the three rivers. In general, the algal density decreased from 2005 to 2007. Diatoms and cyanobacteria contributed significantly to the total density during the period from March 1993 to February 1994. The years 2000-2007 presented the lowest diatom contribution to species richness and the highest cyanobacteria contribution. From 2000 on, cryptomonads and cyanobacteria dominated. The interannual variability of phytoplankton was probably influenced by changes in hydrosedimentological regime due to climatic variations (La Niña and El Niño - Southern Oscillation events - ENSO and the operational procedures associated with an upstream reservoirs. Studies on climatic variability and its effects on hydrosedimentological regimes of the Paraná, Baía and Ivinhema rivers and the biota therein are necessary to obtain subsidies for management, including decisions related to the operation of dams upstream and downstream of the study area, with the purpose of minimizing risks to the Environmental Protection Area.

  2. Water balance analysis of the Morava River floodplain in the Kostice-Lanžhot transect using the WBCM-7 model.

    Science.gov (United States)

    Kovář, Pavel; Heřmanovská, Darina; Hadaš, Pavel; Hrabalíková, Michaela; Pešková, Jitka

    2016-02-01

    The study area of the Morava River floodplain is situated between the rivers Morava and Kyjovka in the reach from Hodonín to Lanžhot. This experimental area was chosen because during the last 30 years, there has been a serious problem with the frequent occurrence of hydrological extremes, such as floods and droughts. Dry seasons have a very negative impact on the floodplain forest and have been caused mainly by regulation of the Morava River channel in the 1970s. Since flooding in the catastrophic year 1977, a part of this area has served as a polder for flood impact mitigation of the urbanised area of the town of Lanžhot. Management and farming practices have been heavily affected by the enormous economic and ecological damage due to long-term flooding of agricultural land. The purpose of this study is to assess the extent to which the precipitation in the growing season of the dry years 2003 and 2011 was deficient, in comparison with the normal year 2009, through a study of the actual evapotranspiration caused by the significant drought in the Morava floodplain. A similar but converse situation in the wet year 2010 was also analysed, with the aim to show the differences in the components of the water balance equation in the growing seasons of all the extreme years tested here. The daily data from the Kostice climatological station were processed using the WBCM-7 model, where the input parameters were calibrated by the fluctuation of the groundwater table in the control borehole.

  3. Strategic Planning for the Development of the Danube Area

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    ANTONIO VALENTIN TACHE

    2014-12-01

    Full Text Available The article includes concepts, information, methodologies of spatial planning focused on the Danube carried out within the European projects "Donauregionen" and "Donauregionen+", financed by the European Union through the South East Europe Transnational Cooperation Programme. The article proposes solutions for solving problems related to the opportunities offered by the Danube as an important corridor to support the economic growth and competitiveness of functional regions in the Danube area. The current situation in the Danube River riparian land-use planning policies involves (a creating the spatial concept of the Danube area interregional level, b developing integrated strategies to develop sectoral strategies embodied in the Danube area, the Transdanube strategy and development strategies for the Danube region as a whole. In this general scheme, indicators have been proposed, designed on four main areas (natural conditions, housing and human resources, technical infrastructure and transport, and economy. Based on the analyses conducted in the project, five Danube sub-regions and 19 Transdanube regions were established. Using the forecasting methodology proposed in the “Donauregionen+” project, three types of scenarios were developed for each sub-region: pessimistic, realistic and optimistic. All these scenarios have resulted in GIS cartograms, based on groups of territorial indicators that highlight the socio-economic development capacity of the Danube sub-regions.

  4. Newborns health in the Danube Region

    DEFF Research Database (Denmark)

    Andersen, Zorana J; Sram, Radim J; Ščasný, Milan

    2016-01-01

    risks, and knowledge gaps in the Danube Region, based on publicly available databases, registers, and literature, as a rationale and incentive for a new integrated project. The review also proposes the concept for the project aiming to characterize in utero exposures to multiple environmental factors...... and estimate their effect on early-life health, evaluate economic impact, as well as identify interventions with a potential to harness social norms to reduce emissions, exposures and health risks in the Danube Region. METHODS: Experts in environmental epidemiology, human biomonitoring and social science...... on lifestyle, indoor exposures, noise, occupation, socio-economic status, risk-averting behavior, and preferences; and undertake clinical examinations of children at and after birth. Birth cohort will include at least 2000 newborns per site, and a subset of at least 200 mother-child pairs per site...

  5. THE RURAL TOURISM IN DANUBE DELTA

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    Ionica SOARE

    2014-06-01

    Full Text Available Purpose - the purpose of this paper is to evaluate the rural areas has market size and forecast its development as an economic activity. The present paper aims at analyzing the rural areas has in Danube Delta. In an enviable BAs which have responsibility for their particular isolated, such as the Danube Delta and the Danube that used, fishing and rural areas has the main activities that provide jobs and income sources for local populations. Design/methodology/approach - A survey was administered to customers’ rural hostel accommodation in Danube Delta. Descriptive statistics method was mainly adopted to calculate the mean with standard deviation of entry assumes variable, and to examine the different levels of consumers' awareness. The index values of product familiarity, the ratio between entries assumes product's familiarity value and the average value. Findings - the research results show hash has rural consumers have different perception and accomplished through behaviour. The information channels of brand hash mainly from friends, relatives and neighbours, so word of mouth spreading is very important for a brand. Women show a higher sensitivity in health and are currently operating the propensity than referred to follow the recommendations for nutrition. Research limitations/implications - This item is intended to synthesize developments and challenges," on June 13th rural market growth has. The results of this paper should be considered tentatively until has also features replicated by larger has rural consumers. Originality/value - members of rural areas has consumer's behavior would improve marketing and the development of rural areas has products, in order to reduce consumer confusion.

  6. Species richness of testate amoebae in different environments from the upper Paraná river floodplain (PR/MS - doi: 10.4025/actascibiolsci.v33i3.7261 Species richness of testate amoebae in different environments from the upper Paraná river floodplain (PR/MS - doi: 10.4025/actascibiolsci.v33i3.7261

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    Fábio Amodêo Lansac-Tôha

    2011-07-01

    Full Text Available This study evaluated the species richness of testate amoebae in the plankton from different environments of the upper Paraná river floodplain. Samplings were performed at subsurface of pelagic region from twelve environments using motorized pump and plankton net (68 µm, during four hydrological periods. We identified 67 taxa, distributed in seven families and Arcellidae, Difflugiidae and Centropyxidae were the most representative families. Higher values of species richness were observed in the lakes (connected and isolated during the flood pulses. Centropyxis aculeata, Difflugia gramem and D. pseudogramem were frequent throughout the study period. Seasonal variability of species in the channels and isolated lakes was evidenced by beta diversity. Besides that, in the rivers, extreme changes in species composition were verified during the high-water period. Our results highlight the importance of the present study to improve the knowledge about the diversity and geographic distribution of these organisms in Brazil and emphasize the importance of current flow in the displacement of testate amoebae from their preferred habitats, marginal vegetation and sediment.This study evaluated the species richness of testate amoebae in the plankton from different environments of the upper Paraná river floodplain. Samplings were performed at subsurface of pelagic region from twelve environments using motorized pump and plankton net (68 µm, during four hydrological periods. We identified 67 taxa, distributed in seven families and Arcellidae, Difflugiidae and Centropyxidae were the most representative families. Higher values of species richness were observed in the lakes (connected and isolated during the flood pulses. Centropyxis aculeata, Difflugia gramem and D. pseudogramem were frequent throughout the study period. Seasonal variability of species in the channels and isolated lakes was evidenced by beta diversity. Besides that, in the rivers, extreme

  7. Temporal-spatial patterns of intestinal parasites of the Hooded Crane(Grus monacha) wintering in lakes of the middle and lower Yangtze River floodplain

    Institute of Scientific and Technical Information of China (English)

    Wei; Huang; Lizhi; Zhou; Niannian; Zhao

    2014-01-01

    Background: Parasites have adverse effects on the life and survival of many migratory waterbirds, especially birds on the endangered species list. Hooded Cranes are large migratory colonial waterbirds wintering in wetlands,which are prone to parasite infection, thus monitoring the diversity of parasites is important for sound wetland management and protection of this species.Methods: From November 2012 to April 2013, we collected 821 fresh faecal samples from the three lakes(Poyang,Caizi and Shengjin Lake) in the lower and middle Yangtze River floodplain, and detected with saturated brine floating and centrifugal sedimentation methods. Parasite eggs were quantified with a modified Mc Master’s counting method.Results: In this study, 11 species of parasites were discovered, i.e., two coccidium(Eimeria gruis, E. reichenowi), five nematodes(Capillaria sp., Strongyloides sp., Ascaridia sp., Trichostrongylus sp., Ancylostomatidae), three trematodes(Echinostoma sp., Echinochasmus sp., Fasciolopsis sp.) and one cestode(Hymenolepis sp.). About 57.7% of the faecal samples showed parasitic infection. All species of parasites were found at the three sites except Hymenolepis which was not found at Poyang Lake. While most samples were affected by only one or two species of parasites, infection by Eimeria spp. was the most common(53.1%). From One-Way ANOVA analysis of the three lakes, parasite species richness index(p = 0.656), diversity index(p = 0.598) and evenness index(p = 0.612) showed no significant difference. According to the statistical analysis of our data, there were no significant difference in parasite species richness index(p = 0.678) and evenness index(p = 0.238) between wintering periods, but a strong difference in diversity index(p < 0.05).Conclusions: Our study suggests that in the wintering Hooded Crane populations, parasite diversity is more sensitive to changes in the overwintering periods than to locations. This also indicates that with the limitations of

  8. Abiotic variables in littoral-limnetic gradient of an oxbow lake of Mogi-Guaçu River floodplain, Southeastern, Brazil

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    Glória Massae Taniguchi

    2004-11-01

    Full Text Available The present study aimed to analyse the abiotic characteristics spatial variability in the littoral-limnetic gradient of the Diogo Pond, Mogi-Guaçu River floodplain, as well as evaluating the hydrological influence on the spatial gradient. During the hydrological cycle, four field trips (high water, flood, low water, and drought were carried out at three sampling stations: littoral, interface, and limnetic region. Analysis of physical and chemical variables allowed to conclude that the time scale established by the hydrological cycle was the main forcing function over the limnological variability of the Diogo Pond. The relative spatial scale related to littoral-limnetic gradient contributed secondarily to the abiotic variability. Littoral was characterized as a distinct compartment from the other stations during the entire hydrological cycle.O presente estudo visou analisar a variabilidade espacial de características limnológicas abióticas no gradiente litorâneo-limnético na lagoa do Diogo, planície de inundação do rio Mogi-Guaçu, bem como avaliar a influência do regime hidrológico no gradiente espacial. Quatro coletas foram realizadas durante o ciclo hidrológico (enchente, cheia, vazante e seca e em três estações de amostragem: região litorânea, região limítrofe e região limnética. Através das análises de variáveis físicas e químicas pôde-se concluir que a escala temporal, determinada pelo regime hidrológico, foi a principal função de força sobre a variabilidade limnológica na lagoa do Diogo. A escala espacial relativa ao gradiente litorâneo-limnético contribuiu, secundariamente, com a variabilidade dos fatores limnológicos abióticos. A região litorânea foi caracterizada como um compartimento separado das demais regiões em todas as épocas do ciclo hidrológico.

  9. Multiple lines of evidence risk assessment of American robins exposed to polychlorinated dibenzofurans (PCDFS) and polychlorinated dibenzo-P-dioxins (PCDDS) in the Tittabawassee River floodplain, Midland, Michigan, USA.

    Science.gov (United States)

    Tazelaar, Dustin L; Fredricks, Timothy B; Seston, Rita M; Coefield, Sarah J; Bradley, Patrick W; Roark, Shaun A; Kay, Denise P; Newsted, John L; Giesy, John P; Bursian, Steven J; Zwiernik, Matthew J

    2013-06-01

    Concentrations of polychlorinated dibenzofurans (PCDFs) and polychlorinated dibenzo-p-dioxins (PCDDs) in Tittabawassee River floodplain soils and biota downstream of Midland, Michigan, USA, are greater than regional background concentrations. From 2005 to 2008, a multiple lines of evidence approach was utilized to evaluate the potential for effects of PCDD/DFs on American robins (Turdus migratorius) breeding in the floodplains. A dietary-based assessment indicated there was potential for adverse effects for American robins predicted to have the greatest exposures. Conversely, a tissue-based risk assessment based on site-specific PCDD/DF concentrations in American robin eggs indicated minimal potential for adverse effects. An assessment based on reproductive endpoints indicated that measures of hatch success in study areas were significantly less than those of reference areas. However, there was no dose-response relationship between that endpoint and concentrations of PCDD/DF. Although dietary-based exposure and reproductive endpoint assessments predicted potential for adverse effects to resident American robins, the tissue-based assessment indicates minimal to no potential for adverse effects, which is reinforced by the fact the response was not dose related. It is likely that the dietary assessment is overly conservative given the inherent uncertainties of estimating dietary exposure relative to direct tissue-based assessment measures. Based on the available data, it can be concluded that exposure to PCDD/DFs in the Tittabawassee River floodplain would not likely result in adverse population-level effects to American robins.

  10. Euglenophyta of the Danube River in Serbia

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    Subakov-Simić Gordana

    2008-01-01

    Full Text Available Most genera and many species of euglenophytes exist worldwide. They usually occur during the summer months in slow-flowing and stagnant waters, rich with organic substances. Euglenophytes of the Danube River in Serbia were studied at 16 localities during 2002-2003. A total of 61 taxa were found, 21 belonging to the genus Euglena Ehr., eight to Lepocinclis Perty, 15 to Phacus Duj., six to Strombomonas Defl., and 11 to Trachelomonas Ehr. The highest number of taxa (35 was recorded at Bačka Palanka during September 2002, but at the Tekije locality no euglenophytes were detected at all.

  11. A new species of Jainus (Monogenea, gill parasite of Schizodon borellii (Characiformes, Anostomidae from the upper Paraná river floodplain, Brazil - doi: 10.4025/actascibiolsci.v33i2.6168 A new species of Jainus (Monogenea, gill parasite of Schizodon borellii (Characiformes, Anostomidae from the upper Paraná river floodplain, Brazil - doi: 10.4025/actascibiolsci.v33i2.6168

    Directory of Open Access Journals (Sweden)

    Gilberto Cezar Pavanelli

    2011-05-01

    Full Text Available Jainus piava n. sp. is described from the gills of Schizodon borellii (Boulenger, 1900 (Characiform, commonly named as piava from the upper Paraná River floodplain, Brazil. The new species differs from the other members of Jainus in the following features: ventral bar thin broadly V-shaped and male copulatory organ (MCO a coil of about 1.5 rings. Jainus piava n. sp. is similar to species of Jainus by having a ventral anchor base with flattened superficial root and elongate rodlike deep root.Jainus piava n. sp. is described from the gills of Schizodon borellii (Boulenger, 1900 (Characiform, commonly named as piava from the upper Paraná River floodplain, Brazil. The new species differs from the other members of Jainus in the following features: ventral bar thin broadly V-shaped and male copulatory organ (MCO a coil of about 1.5 rings. Jainus piava n. sp. is similar to species of Jainus by having a ventral anchor base with flattened superficial root and elongate rodlike deep root.

  12. Distribution patterns, population status and conservation of Melanosuchus niger and Caiman yacare (Crocodylia, Alligatoridae in oxbow lakes of the Ichilo river floodplain, Bolivia

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    Ximena Aguilera

    2008-06-01

    Full Text Available Caiman yacare (lagarto and Melanosuchus niger (black caiman, sympatric species in the Bolivian Amazon basin, have been severely overexploited in the past. We present the results of a standardized survey of C. yacare and M. niger populations in order to evaluate their actual population status in twelve oxbow lakes of the Ichilo River floodplain. Additionally we explored the effect of environmental and anthropogenic variables on caiman distribution patterns. The average density of C. yacare and M. niger in the shoreline of floodplain lakes was of 6 and 1 ind/km, respectively. For both species, the population was composed mainly of juvenile individuals. We used regression tree analysis (RTA to assess patterns of M. niger and C. yacare densities with eight environmental and two anthropogenic variables. The RTA analysis showed that the variation in the densities of both C. yacare (52.4 % and M. niger (36.8 % was related to water conductivity. For C. yacare, higher densities occurred at higher values of water conductivity, while M. niger densities followed an opposite trend, resulting in relatively well spatially segregated populations of the two species. After excluding conductivity, Lake-River Distance (LRD was shown to be the main splitting variable in the RTA analysis. The observed distribution patterns may be the result of the historical post-hunting situation, in combination with differences in habitat selection by the two species, and competitive exclusion processes between the two species. M. niger, a species reported to be recovering slowly from previous low population levels, appears relatively well protected in the Ichilo river floodplain. Rev. Biol. Trop. 56 (2: 909-929. Epub 2008 June 30.Caiman yacare (lagarto y Melanosuchus niger (caiman negro, son dos especies simpátricas para la cuenca amazónica Boliviana que han sido severamente sobreexlotadas en el pasado. El objetivo de la presente investigación es el de evaluar el estado actual

  13. Linking river, floodplain, and vadose zone hydrology to improve restoration of a coastal river affected by saltwater intrusion.

    Science.gov (United States)

    Kaplan, D; Muñoz-Carpena, R; Wan, Y; Hedgepeth, M; Zheng, F; Roberts, R; Rossmanith, R

    2010-01-01

    Floodplain forests provide unique ecological structure and function, which are often degraded or lost when watershed hydrology is modified. Restoration of damaged ecosystems requires an understanding of surface water, groundwater, and vadose (unsaturated) zone hydrology in the floodplain. Soil moisture and porewater salinity are of particular importance for seed germination and seedling survival in systems affected by saltwater intrusion but are difficult to monitor and often overlooked. This study contributes to the understanding of floodplain hydrology in one of the last bald cypress [Taxodium distichum (L.) Rich.] floodplain swamps in southeast Florida. We investigated soil moisture and porewater salinity dynamics in the floodplain of the Loxahatchee River, where reduced freshwater flow has led to saltwater intrusion and a transition to salt-tolerant, mangrove-dominated communities. Twenty-four dielectric probes measuring soil moisture and porewater salinity every 30 min were installed along two transects-one in an upstream, freshwater location and one in a downstream tidal area. Complemented by surface water, groundwater, and meteorological data, these unique 4-yr datasets quantified the spatial variability and temporal dynamics of vadose zone hydrology. Results showed that soil moisture can be closely predicted based on river stage and topographic elevation (overall Nash-Sutcliffe coefficient of efficiency = 0.83). Porewater salinity rarely exceeded tolerance thresholds (0.3125 S m(-1)) for bald cypress upstream but did so in some downstream areas. This provided an explanation for observed vegetation changes that both surface water and groundwater salinity failed to explain. The results offer a methodological and analytical framework for floodplain monitoring in locations where restoration success depends on vadose zone hydrology and provide relationships for evaluating proposed restoration and management scenarios for the Loxahatchee River.

  14. Organic Carbon Inventories and Vertical Fluxes Through the Vadose Zone into Groundwater at the Rifle, Colorado River Floodplain Site

    Science.gov (United States)

    Tokunaga, T. K.; Wan, J.; Dong, W.; Williams, K. H.; Robbins, M.; Kim, Y.; Faybishenko, B.; Conrad, M. E.; Christensen, J. N.; Gilbert, B.; Dayvault, R. D.; Long, P. E.; Hubbard, S. S.

    2013-12-01

    Understanding carbon inventories and fluxes within the vadose zone and groundwater of semi-arid regions is challenging because of their typically deep profiles, moderately low soil organic carbon (SOC) inventories, low dissolved organic carbon (DOC) fluxes, and slow changes in soil inorganic carbon (SIC) inventories. The remediated uranium/vanadium mill tailings site situated on a floodplain at Rifle, Colorado possesses a number of characteristics that facilitate investigation of subsurface carbon fluxes. These include locally derived fill soil having SOC and SIC concentrations representative of the region, established vegetation cover (perennial grasses and shrubs) on the fill, boundaries between the fill and underlying alluvium distinguishable through concentrations of SIC and other chemical components, predictable groundwater flow and interaction with the adjacent Colorado River, and a clearly delineated impermeable lower boundary (Wasatch Formation shale) at depths ranging from 6 to 7.5 m. Environmental characteristics of this site permit year-round sampling of both pore water and pore gas throughout most of the moderately deep (~ 3.5 m) vadose zone. Within this well-defined hydrological system, we recently installed a suite of tensiometers, pore water (vadose zone and groundwater) samplers, gas samplers, and neutron probe access tubes at three sites along a transect aligned with the groundwater flow direction in order to determine inventories and fluxes of water, carbon, and other components. The tensiometer and piezometer measurements are revealing impacts of infiltration and groundwater recharge events, evapotranspiration, and capillary fringe-groundwater interactions. The results of pore water analyses are showing relatively high concentrations of DOC (up to 4 mM) in the vadose zone, and particulate organic carbon (POC) mobile in the capillary fringe. Differences in DOC characteristics are being determined using a variety of analytical techniques. Hydraulic

  15. The Danube - the Southern Border of Moldova. Historical Aspects

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    Ruslan Șevcenco

    2014-08-01

    Full Text Available For centuries the Danube was the southern border of Moldova. Moldova had the following ports: Chile, Izmail, Reni, Galati and others. This has contributed significantly to the economic development. Turkish authorities, becoming aware of the Danube immense importance at the trade, economic, and military-political level, partly conquered the Danube bay, which belonged to Moldova. In order to reduce the influence of Moldova, the Ottoman Empire created its own boundaries on this territory. Although divided into two (the east side was occupied by the Russian army, Moldova regained access on Danube at its previous borders, starting with the liquidation of the Turks domination. But in 1940 under the influence of Nikita Khrushchev, who had the position of first secretary of the Central Committee of the Communist Party (Bolshevik of Ukraine, the counties adjacent to the Danube - the territory between the Prut and Nistru - were transferred to Ukraine and its membership remained until the present days. The current authorities had managed to keep only a small segment of the Danube bay. In this article we will elucidate how for centuries the Moldovan authorities have struggled to maintain a part of the Danube's bay.

  16. Growth of companies and water level fluctuations of the river Danube

    Science.gov (United States)

    Jánosi, Imre M.; Gallas, Jason A. C.

    1999-09-01

    Recent studies on growth rate of publicly traded companies revealed interesting scaling properties and universality. Based on the statistical analysis, different models have been proposed to cast light into the inner workings of companies responsible for the phenomena observed. The purpose of this paper is to point out that the properties of the analysed economic data might be present in a wider class of complex systems producing strongly correlated noisy time series. As an illustration, we report an investigation of the daily water-level fluctuations of the river Danube over a period of 87 years, as measured in Nagymaros, Hungary. The Danube data shows similar characteristics to those seen in the company growth. This suggests that a universal description of the statistics should exist for both systems.

  17. Challenges of river basin management: Current status of, and prospects for, the River Danube from a river engineering perspective.

    Science.gov (United States)

    Habersack, Helmut; Hein, Thomas; Stanica, Adrian; Liska, Igor; Mair, Raimund; Jäger, Elisabeth; Hauer, Christoph; Bradley, Chris

    2016-02-01

    In the Danube River Basin multiple pressures affect the river system as a consequence of river engineering works, altering both the river hydrodynamics and morphodynamics. The main objective of this paper is to identify the effects of hydropower development, flood protection and engineering works for navigation on the Danube and to examine specific impacts of these developments on sediment transport and river morphology. Whereas impoundments are characterised by deposition and an excess of sediment with remobilisation of fine sediments during severe floods, the remaining five free flowing sections of the Danube are experiencing river bed erosion of the order of several centimetres per year. Besides the effect of interruption of the sediment continuum, river bed degradation is caused by an increase in the sediment transport capacity following an increase in slope, a reduction of river bed width due to canalisation, prohibition of bank erosion by riprap or regressive erosion following base level lowering by flood protection measures and sediment dredging. As a consequence, the groundwater table is lowered, side-arms are disconnected, instream structures are lost and habitat quality deteriorates affecting the ecological status of valuable floodplains. The lack of sediments, together with cutting off meanders, leads also to erosion of the bed of main arms in the Danube Delta and coastal erosion. This paper details the causes and effects of river engineering measures and hydromorphological changes for the Danube. It highlights the importance of adopting a basin-wide holistic approach to river management and demonstrates that past management in the basin has been characterised by a lack of integration. To-date insufficient attention has been paid to the wide-ranging impacts of river engineering works throughout the basin: from the basin headwaters to the Danube Delta, on the Black Sea coast. This highlights the importance of new initiatives that seek to advance knowledge

  18. New approaches in European governance? Perspectives of stakeholders in the Danube macro-region

    Directory of Open Access Journals (Sweden)

    Franziska Sielker

    2016-01-01

    Full Text Available Macro-regional cooperation in the EU are networks that use the horizontal and vertical dimension of the multilevel governance system to influence both strategic decision-making as well as implementation activities. Drawing on an analysis of expert interviews in the Danube Region the paper scrutinizes stakeholders’ shared views towards expectations, challenges and added values, and thereby seeks to explain why a trend towards macro-regions arises and for what reasons stakeholders are getting involved. The analysis of the drivers for stakeholders’ commitment in the EU Danube Region Strategy shows that new governance arrangements need to be adjustable to different contexts, allow for negotiation and new network creation whilst simultaneously offering the political ability to act. The evidence presented suggests that multilevel governance in the EU is becoming increasingly complex, embracing more and different types of cooperation, with soft characteristics as crucial elements.

  19. River Bed Morphology Assessment of The Lower Danube In The Common Romanian-bulgarian River Reach (danube Km 845 - Km 375).

    Science.gov (United States)

    Behr, O.; Bondar, C.; Gutknecht, D.; Modev, S.; Petkovic, S.

    In den Lower Danube reach numerous problems have arisen over the past two to three decades linked to changes of the river morphology and to erosion along the Danube reach between the Iron Gates reservoirs and the Danube delta. To address this issue of river morphology and its consequences for all types of water management activities in this area, a common initiative of all involved countries was launched that led to the definition of a project entitled "Morphological Changes and Abatement of their Neg- ative Effects on a Selected Part of the Danube River". Implementation of this project was made possible by Phare funding through the EPDRB (Environmental Program for the Danube River Basis). This paper reports on the results of this two-phase project. In the first phase, performed in 1997, an inventory of all available material to assess the river morphology in the approx. 470 km long common Bulgarian-Romanian river reach (km 375 - km 845) was prepared. Analysing various sources of information as bathymetric maps (1908, 1938, 1966), cross-section profiles and discharge-stage curves at gauging stations, and suspended sediment data from the time period 1956-1995, a first overall picture of the morphological changes during this period could be prepared indicating (i) a general tendency of decreasing water levels over this period, (ii) a general decrease of suspended loads both in the Danube river and its tributaries, (iii) pronounced changes in the morphological features of the reach, e.g. changes of bank lines due to bank erosion and changes in the number and size of islands along the whole river reach. To prepare the preconditions for remedial action planning a second phase project was performed between October 1998 and February 2000. It was aimed at the develop- ment of a common and integrating monitoring methodology for the Lower Danube and the development of recommendations for global agreements between the involved countries on future monitoring, data and

  20. Danube region strategy: Arguments for a territorial capital based multilevel approach

    Directory of Open Access Journals (Sweden)

    Giffinger Rudolf

    2010-01-01

    Full Text Available During the last months the discussion on a strategy for the Danube Region as a new approach for a European macro-region has been intensified, predominantly within the area of Central and South-Eastern Europe. Evidently the territory of the Danube Region is characterized by a divergent group of countries concerning the process of integration and the preconditions in geographic, economic, cultural and socio-demographic terms. Besides, the region’s spatial development shows divergent trends causing increasing regional disparities. Therefore, territorial cohesion - understood as intensified functional interrelations and strategic cooperation - is jeopardized in manifold ways. Hence, the main objective of this paper is to discuss the basic features of a strategy aiming at strengthening the polycentric development on different spatial levels. We start by assuming that the development of every city (as an element of the urban system depends on its territorial capital and relevant assets providing location based advantages regarding its competitiveness on different spatial levels. Therefore we uncover what we understand as assets driving urban development. In this context the meaning of polycentric development and the importance of polycentric structures as an asset of a city’s territorial capital is being revealed. Based on these conceptual considerations we examine some relevant features of the urban polycentric system in the Danube region and finally argue that a multilevel and evidence based approach should be evolved facing the differences in the preconditions and already existing assets of spatial development.

  1. Democracy and Identity in the Danube Region (the Case of Romania and Hungary

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    Boryana Stancheva

    2014-08-01

    Full Text Available The paper aims at researching the interconnection between two key concepts in political sciences Ŕ Ŗdemocracyŗ and Ŗidentityŗ. The analysis is focused on the Danube Region as an example of a macro-regional construct in the multi-level governance system of the European Union. The author is working on a PhD dissertation dedicated to the democratic deficits in the European Union, with a specific focus on two of the newest member states Ŕ Hungary and Romania. Since both Ŗdemocracyŗ and Ŗidentityŗ are notions that have not been defined by consent in the post-communist member states of the Union, the paper chooses to particularly examine their impact in Romania and Hungary by researching different information sources and statistical data. The paper has to examine the level of interdependency of the post-communist political identity of Hungary and Romania and the state of democracy and its institutions. The results have to be further discussed not only in the context of both countriesř EU-membership, but also with a view to their belonging to the newly established Danube macro-region. The following paper and its results are part of the long-term PhD research of the author. The study will add value to the analysis of two fundamental notions in the theory of political and social sciences by trying to examine the level of their interconnection in two Danube countries.

  2. Eco Bio Cultural Protocols for Preservation of Endangered Agrobiodiversity Areas from the Adjacent Regions of Danube and Danube Delta

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    Iudith Ipate

    2014-08-01

    Full Text Available Danube Strategy involves creating synergies between different sectors (tourism, environmental protection, agriculture and forestry, promoting solutions and contributing to the prosperity of social, economic and cultural sustainable development. It requires multiinterdisciplinary problem solving biodiversity conservation and environmental protection. Agrobiodiversity conservation and means must be assessed according to international risk categories, taking into account the culture, traditions and local lifestyle. Fundamental aspects of the protocols will be to assess species and breeds endangered and their influence on specific ecosystems of the Danube and Danube Delta to promote local tradition and cultural heritage. Our studies will have to reveal new interdependencies between socio- economic phenomena that occur in the context of regional sustainable development and identify viable solutions to ensure the conservation of agrobiodiversity as part of the natural and cultural heritage of the Danube Delta . Need of cooperation between Danube countries and between local authorities and research entities to conserve natural and cultural heritage that can be achieved based on eco-bio-diplomacy. Need of cooperation between Danube countries and between local authorities and research entities to conserve natural and cultural heritage that can be achieved based on eco-bio-diplomacy.

  3. Traditional Jewelry on Both Sides of the Danube River

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    P. Chaushev

    2015-09-01

    Full Text Available From the Ancient times Danube River acts as stabile and almost uncontested Northern border of Bulgarian lands. For a very long period it divides different populations speaking different languages, developing different cultures and political units. In the same times Danube River unites it is both banks by cheap and easy to manage transportation. More than this Danube as a liquid border connects populations from the both banks with Central Europe serving as a vehicle for people, goods, money and ideas. The aim of this article is to explore one particular segment of culture connections - the evolution of traditional jewelry from 19th to early 20th century in the region of Northern Bulgaria and Southern Romania. The focus is on snake or dragon motifs carved on belt buckles originated from both sides of the border. This and related believes and cult practices reveals close cultural and commercial ties crossing Danube River. During my research I came across material that showed that those motifs were found in several Balkan countries (Serbia and Greece. The decoration of this traditional jewelry is typical for the Orient, but it is common among the Christian population of the Balkan Peninsula. It shows that in those times the Danube River was acting mostly as natural, not as a political or cultural border.

  4. The Intercultural Danube - a European Model

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    Gheorghe Lateș

    2014-08-01

    Full Text Available The EU construction began following the logic of economics, which in time it has created dysfunctions that seem to accentuate and create a quasi-general skepticism. This paper aims at analyzing the union construction and reconstruction on other conceptual premises, placing culture at the forefront of the new strategy. A multicultural Europe, based on the state primordial ethnicity is no longer current; the cultural diversity does not lead to unity, but rather it is a factor of dissolution. The Danubian model reunites races, languages and religions, being so diverse that their functional diachrony justifies the idea of reconstruction, based on what it was, and it did not generate tensions or conflicts. The ethnic identity did not become, in the Danube area, ethnicism, what it constitutes in a synchronic approach, as a model of rethinking the union, not by hierarchies, barriers, but rather by the opportunity of the coexistence of the peoples that connect history and the present of the horizontal axis River of a united Europe.

  5. Resources the Development of Tourism of Ukrainian Danube

    Directory of Open Access Journals (Sweden)

    Vyacheslav Todorov

    2016-08-01

    Full Text Available Are examined geographic development background of tourist-recreational activity in Ukrainian Danube. Are analyzed the general particularities recreational potential of region. Ukrainian Danube the unique natural resource potential. It has huge reserves of water resources that are exclusive to the steppe zone. Specificity of the geographical location, variegated ethnic structure of the population, the deterioration of the conditions of his life and especially of the legal framework of the state in the field of ethno-national to a large extent define the modern ethno-cultural and ethnopolitical situation in the Ukrainian Danube region. Historic and geographic features of development between the rivers and caused considerable impact of external factors on ethno-national situation. The specific location of the region determines the presence of a significant number of potential users of the entertainment industry.

  6. Real time flood forecasting in the Upper Danube basin

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    Nester Thomas

    2016-12-01

    Full Text Available This paper reports on experience with developing the flood forecasting model for the Upper Danube basin and its operational use since 2006. The model system consists of hydrological and hydrodynamic components, and involves precipitation forecasts. The model parameters were estimated based on the dominant processes concept. Runoff data are assimilated in real time to update modelled soil moisture. An analysis of the model performance indicates 88% of the snow cover in the basin to be modelled correctly on more than 80% of the days. Runoff forecasting errors decrease with catchment area and increase with forecast lead time. The forecast ensemble spread is shown to be a meaningful indicator of the forecast uncertainty. During the 2013 flood, there was a tendency for the precipitation forecasts to underestimate event precipitation and for the runoff model to overestimate runoff generation which resulted in, overall, rather accurate runoff forecasts. It is suggested that the human forecaster plays an essential role in interpreting the model results and, if needed, adjusting them before issuing the forecasts to the general public.

  7. Long-term tritium monitoring to study river basin dynamics: case of the Danube River basin

    Science.gov (United States)

    Aggarwal, Pradeep; Araguas, Luis; Groening, Manfred; Newman, Brent; Kurttas, Turker; Papesch, Wolfgang; Rank, Dieter; Suckow, Axel; Vitvar, Tomas

    2010-05-01

    During the last five decades, isotope concentrations (O-18, D, tritium) have been extensively measured in precipitation, surface- and ground-waters to derive information on residence times of water in aquifers and rivers, recharge processes, and groundwater dynamics. The unique properties of the isotopes of the water molecule as tracers are especially useful for understanding the retention of water in river basins, which is a key parameter for assessing water resources availability, addressing quality issues, investigating interconnections between surface- and ground-waters, and for predicting possible hydrological shifts related to human activities and climate change. Detailed information of the spatial and temporal changes of isotope contents in precipitation at a global scale was one of the initial aims of the Global Network of Isotopes in Precipitation (GNIP), which has provided a detailed chronicle of tritium and stable isotope contents in precipitation since the 1960s. Accurate information of tritium contents resulting of the thermonuclear atmospheric tests in the 1950s and 1960s is available in GNIP for stations distributed world-wide. Use of this dataset for hydrological dating or as an indicator of recent recharge has been extensive in shallow groundwaters. However, its use has been more limited in surface waters, due to the absence of specific monitoring programmes of tritium and stable isotopes in rivers, lakes and other surface water bodies. The IAEA has recently been compiling new and archival isotope data measured in groundwaters, rivers, lakes and other water bodies as part of its web based Water Isotope System for Data Analysis, Visualization and Electronic Retrieval (WISER). Recent additions to the Global Network of Isotopes in Rivers (GNIR) contained within WISER now make detailed studies in rivers possible. For this study, we are re-examining residence time estimates for the Danube in central Europe. Tritium data are available in GNIR from 15

  8. Bessarabian Danube Motifs in the Lyrics of the Land

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    Reva-Lievshakova Liudmyla

    2016-08-01

    Full Text Available Danube poetic circle edge includes many names creative people of all ages. They are more or less known as Bessarabia. The history of poetry edge associated with the activities of the Association of Writers of Bessarabia «Budjak» which is hipidstrukturnym union the National Union of Writers of Ukraine. Members of this association is Ismail authors: V. Reva B., O. Kartelyan, L. Oliynyk, T. Kibkalo, A. Gurieva, N. Parshyhina, V. Vorobiev et al. These authors are members Izmail literary association named after M. Vasilyuk. By Ismail litob'yednannya creative individuals drawn from Bolgrad, Reni, Kiliya, Vylkove, Saratov, Tarutino, Tatarbunary – almost the entire south of Odessa region. In lyric poets of Bessarabia, in addition to general themes of signs of life, sense, philosophy is the theme of his native land, which borders the Danube is geographically defined. In verses Danube notable poets motifs steppe landscapes, river horizon, lush greenery on the banks of freshwater – that living, bright, colorful, causing a certain emotional state that is displayed in the lyrical lines. Each of the authors of the style and manner, his subtle strings of verbal and sensory impact on the reader, your experience and related experience. Song Bessarabia grounds cover a huge color landscape beauty and related areas of geographical names (Budjak, Steppe of Budzhatsk, lakes (Katlabuh, Yalpug, Kugurluy, names of settlements (Dolukioy, historical names Danube city of Izmail (Smil, Tuchkov. They are widely used artistic palette of each of Danube poets znakuyuchy native land and its nature, conveying deep patriotic feelings. These names as symbols of «small» country characterized by an individual, a kind of complex sensory images and associations.

  9. Network-based Modeling of Mesoscale Catchments - The Hydrology Perspective of Glowa-danube

    Science.gov (United States)

    Ludwig, R.; Escher-Vetter, H.; Hennicker, R.; Mauser, W.; Niemeyer, S.; Reichstein, M.; Tenhunen, J.

    Within the GLOWA initiative of the German Ministry for Research and Educa- tion (BMBF), the project GLOWA-Danube is funded to establish a transdisciplinary network-based decision support tool for water related issues in the Upper Danube wa- tershed. It aims to develop and validate integration techniques, integrated models and integrated monitoring procedures and to implement them in the network-based De- cision Support System DANUBIA. An accurate description of processes involved in energy, water and matter fluxes and turnovers requires an intense collaboration and exchange of water related expertise of different scientific disciplines. DANUBIA is conceived as a distributed expert network and is developed on the basis of re-useable, refineable, and documented sub-models. In order to synthesize a common understand- ing between the project partners, a standardized notation of parameters and functions and a platform-independent structure of computational methods and interfaces has been established using the Unified Modeling Language UML. DANUBIA is object- oriented, spatially distributed and raster-based at its core. It applies the concept of "proxels" (Process Pixel) as its basic object, which has different dimensions depend- ing on the viewing scale and connects to its environment through fluxes. The presented study excerpts the hydrological view point of GLOWA-Danube, its approach of model coupling and network based communication (using the Remote Method Invocation RMI), the object-oriented technology to simulate physical processes and interactions at the land surface and the methodology to treat the issue of spatial and temporal scal- ing in large, heterogeneous catchments. The mechanisms applied to communicate data and model parameters across the typical discipline borders will be demonstrated from the perspective of a land-surface object, which comprises the capabilities of interde- pendent expert models for snowmelt, soil water movement, runoff formation, plant

  10. How do long-term development and periodical changes of river-floodplain systems affect the fate of contaminants? Results from European rivers

    NARCIS (Netherlands)

    Lair, G.J.; Zehetner, F.; Fiebig, M.; Koelmans, A.A.; Slijkerman, D.M.E.

    2009-01-01

    In many densely populated areas, riverine floodplains have been strongly impacted and degraded by river channelization and flood protection dikes. Floodplains act as buffers for flood water and as filters for nutrients and pollutants carried with river water and sediment from upstream source areas.

  11. The Danube Region Protection – Challenges for Green Marketing and Corporate Social Responsibility in Serbia

    Directory of Open Access Journals (Sweden)

    Jelena Stanković

    2015-08-01

    Full Text Available During past years the influence of climate changes on environmental factors, such as water, soil, and air, has become significant and pretty unavoidable. Based on that, anthropogenic influences like industrial, communal, and agricultural wastewater discharge, have become more dangerous for the eco-system as a whole. In this paper we will analyse the possibilities for reducing antropogenic influences through the processes of controlling and monitoring of the wastewater as well as the Danube river water-gang. The European Union Framework Directive has been implemented into the legislative system of the Republic of Serbia, with the purpose of more complete protection of the Danube Region. In that sense, the prevention of the drinking water deficit requires a multidisciplinary approach, which includes activities on green marketing and a higher level of corporate social responsibility. Water, in all its aspects, has a strong economic value, which is the reason why it has to be recognized as an economic resource as well as a highly influential factor of local community development. Integrated management system of wastewater has to be established on the overall cooperation among consumers, planners, and policy designers at all levels – local, regional and global.

  12. FLOOD MODELING OF THE VUKA RIVER SECTION UPSTREAM OF ITS CONFLUENCE WITH THE DANUBE RIVER

    Directory of Open Access Journals (Sweden)

    Dario Marić

    2016-12-01

    Full Text Available In this paper, a section of the Vuka River from its confluence with the Danube River in Vukovar to 3 + 630 rkm was modeled. The possibility and size of floods in the surrounding area were analyzed for different return periods (2, 5, 10, 50, and 100 yrs. Although the high-water levels of the Danube River are lower than the terrain elevation of Vukovar, they cause backwater in the Vuka River and in its tributary, the Bobotski canal. In that indirect way, the surrounding area is endangered and the efficiency of drainage systems is reduced. The existing riverbed of the analyzed Vuka River section was digitalized based on a digital terrain model using the geographic information system (GIS software ArcGIS and the HEC-GeoRAS toolbar. A mathematical model of the steady-state flow of the Vuka river section using the digitized riverbed was executed in the HEC-RAS software using different return periods. The obtained velocities and water levels were analyzed using HEC-RAS, and the sizes of the flooded areas were calculated and observed in ArcGIS.

  13. Avaliação da sustentabilidade agroambiental de unidades produtivas agroflorestais em várzeas flúvio marinhas de Cametá - Pará Agro-environmental sustainability evaluation of productive agroforestry units in tidal river floodplains Cametá Pará

    Directory of Open Access Journals (Sweden)

    Raimundo Nonato da Silveira Ribeiro

    2004-09-01

    Full Text Available O objetivo do trabalho é avaliar o potencial de sustentabilidade agroambiental de unidades produtivas agroflorestais ribeirinhas. A metodologia empregou técnicas de inventário florestal, coleta e análise laboratorial de solo, questionários, observações de campo e orçamentos unitários. As variáveis-indicadores são relativas ao clima, ao solo, a estrutura fitossociológica, ao potencial produtivo da agrofloresta e a geração de renda. Os resultados revelaram que o clima e o solo não são fatores limitantes. Cerca de 27 % da composição florística são espécies comerciais e somam mais de 92 % da população total com baixo potencial para a extração de madeiras e uma diversidade de produtos não-madeireiros. A renda bruta estimada atingiu valores de R$ 2.000,00/ha/ano. O potencial de sustentabilidade agroambiental das unidades produtivas é mediano, obtido pela avaliação das variáveis-indicadores por meio de um sistema de pontuação e inserção em um nível de sustentabilidade previamente proposto.The purpose of this paper is to evaluate the agro-environmental sustainability potential of productive agroforestry units in tidal river floodplains. The methodology employed forest inventory techniques, soil collection and laboratory analysis, questionnaires, field observations and budget sheets. The indicator variables are relative to climate, soils, sociological plant structure, agroforestry's productive potential and the generation of income. Results revealed that climate and soil are not limiting factors. Approximately 27% of the floristic composition is commercial species, making up over 92% of the total tree population having low timber extraction potential and a diversity of non-timber products. Estimated gross income reached sums of R$2,000.00/ha/year. The agro-environmental sustainability potential of the productive units is median and was measured by evaluating the indicator variables on a point system and placed within a

  14. Xanthophyceae planctônicas da planície de inundação do alto rio Paraná - DOI: 10.4025/actascibiolsci.v27i1.1353 Planktonic Xanthophyceae from upper Parana River floodplain - DOI: 10.4025/actascibiolsci.v27i1.1353

    Directory of Open Access Journals (Sweden)

    Sueli Train

    2005-03-01

    Full Text Available Existem poucos estudos abordando a biodiversidade fitoplanctônica em ambientes aquáticos de planície de inundação, o que sugere a necessidade de estudos taxonômicos visando à conservação e recuperação desses ecossistemas. A Classe Xanthophyceae foi estudada quanto à taxonomia e contribuição para a densidade e biomassa fitoplanctônica total. Foram analisadas amostras das regiões pelágica e litorânea de 33 ambientes da planície de inundação do alto rio Paraná, entre fevereiro de 2000 e fevereiro de 2001. As xantofíceas ocorreram em 61% dos biótopos, sendo identificados 20 táxons. Gloeobotrys lunatus Ettl, Goniochloris spinosa Pascher, Istmochloron neustonica Zalocar e Pizarro e Pseudostaurastrum limneticum (Borge Chodat constituíram primeira citação para esse sistema. O maior número de táxons ocorreu nos ambientes próximos ao rio Paraná, destacando-se a lagoa do Osmar. A contribuição de Xanthophyceae para a densidade e biomassa foi reduzida em todo o período estudado, sendo maior no período de águas altasThere are scarce studies concerning phytoplankton biodiversity in floodplain environment. This suggest the need of taxonomic studies for the conservation and recuperation of these ecosystems. Xanthophyceae was studied in relation to taxonomy and contribution to phytoplanktonic density and biomass. Samples were taken from limnetic and seaboard regions in 33 biotopes in the Upper Parana River floodplain, between February 2000 and February 2001. This group occurred in 61% of the biotopes and 20 species were registered. Gloeobotrys lunatus Ettl, Goniochloris spinosa Pascher, Istmochloron neustonica Zalocar and Pizarro and Pseudostaurastrum limneticum (Borge Chodat were considered first citation for this system. The highest number of taxa was registered in the biotopes near Parana River, especially in the Osmar Lagoon. The contribution of Xanthophyceae to density and biomass was low throughout the studied period and

  15. Romanian–British Commercial Exchanges at the Lower Danube: The Consular Report of Percy Sanderson on the Year 1883

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    Cristian Constantin

    2016-12-01

    Full Text Available Researchers consider that the slight increase in commerce through Brăila and Galaţi after 1883 was mainly due to the reorientation of Romanian foreign trade by the dualist monarchy towards other European states. The Danube route-way regained some of its importance, although the port of Galaţi still suffered after the loss of the rich region of Southern Bessarabia and because of the inconvenient manner by which the town was linked to the Romanian railway system. Thus, the paper insists on the quantity and value of commercial exchanges (exports, imports, the grains, the main economic partners and the specific character of Brăila, Galaţi and Sulina in the Romanian economy. This study analyses the results of this fact upon the foreign commerce of the ports, as there are opinions that it had positive consequences for development of commerce and navigation at the Maritime Danube. The text proper is preceded by a short historical comment on the activity of the International Trade in the Lower Danube region.

  16. Social Media Interactions and Online Games - Building up New Human Relationships in Danube Region

    Directory of Open Access Journals (Sweden)

    Predrag K Nikolić

    2015-08-01

    Full Text Available In this paper we are trying to explore possibilities of using online environment, multiplayer gaming culture and social media networks to engage people in the Danube Region around social, multi-cultural and environment initiatives. The Danube Region online community could become a new cultural phenomena, technology mediated, built on human interactions, common interests and cultural heritage which open space for future humancentered social and infrastructural design initiatives. We believe that such social media environment could also be a research playground where people form Danube Region may express their needs and desires as well as to leave the trace of their behavior, significant for further Danube Region development.

  17. Tourism and Pollution versus Danube Legislation (Example Cazane, Romania Area

    Directory of Open Access Journals (Sweden)

    Cipriana Sava

    2014-08-01

    Full Text Available The Danube is the river that runs through ten European countries, with a length of 2875 km, which ranks him second in Europe, being the only one in this part of the world that flows from the west to the east. Tourism development along its length is an important source of income and provides multiple options. The Cazane area is a relatively short portion on the river, located in the lower course of the Danube, very spectacular that also offers tourists unforgettable images.The current legislation supports the development of tourism and protects the river respectively the environment. Unfortunately, there are areas where pollution is present which can jeopardize the tourism activity and destroy the entire habitat. The samplings were taken in the 2011-2013 period by the authors.

  18. PERSISTENT ORGANIC POLLUTANTS - PCBs AND DDTs IN FISH FROM DANUBE RIVER AND FROM BLACK SEA, BULGARIA

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    Mona Stancheva

    2013-06-01

    Full Text Available Persistent organochlorine pollutants (POPs like polychlorinated biphenyls (PCBs and DDT residues (DDTs can still be a problem for the aquatic environment and the human health. PCBs and DDTs were determined in three freshwater fish species: common carp (Cyprinus carpio, catfish (Silurus glanis, pike-perch (Sander lucioperca and two marine fish: shad (Alosa pontica pontica and grey mullet (Mugil cephalus. The freshwater fish samples were collected from the Danube River and from Black Sea, Bulgaria in 2010. The POPs were analyzed in order to investigate the presence of PCBs and DDTs in fish species from Danube River and compared the results to the levels in marine fish species from Black Sea. The fifteen congeners of PCBs, p,p’-DDT and its two main metabolites p,p’-DDE and p,p’-DDD were determined by capillary gas chromatography system with mass spectrometry detection. DDTs were the predominant contaminants in investigated species, with the p,p’- DDE contributing to more than 67% to the total DDTs. In freshwater fish concentrations of DDTs were found from 19.2 to 30.3 ng/g ww and PCBs concentrations - from 6.2 to 12.6 ng/g ww. The highest levels of PCBs and DDTs were determined in shad. The levels of DDTs and PCBs were determined lower than those found in similar fish species from other aquatic ecosystems.

  19. Danube area spatial integration by stimulating the Romanian port cities regeneration

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    Marius Voica

    2014-09-01

    Full Text Available Romania is crossed through by the Danube, the main European river course, the Romanian port cities being an important item of the European river network. Ports as Galati, Tulcea, Giurgiu are part of the Pan-European Corridor IV, assuring the Eastern link for the merchandises entering Europe through some of the main ports as Rotterdam, Wien, Mainz or Strasbourg. Their strategic location is offering the Romanian ports the opportunity of becoming the main gate for the water traffic between Asia and Occident. The paper is developing the concept of urban regeneration of the port cities and their spatial integration within the Danube influence area. The objective is to propose an analyze frame for the port – city system, to identify the possible strategies and actions for promoting the local development and port – cities regeneration supporting. The paper process has the following approaches: the assessment of the economic development, tourist opportunities, culture and nature resources as a support for tourism development and strengthening into the port cities. Population relationships, opportunities within the crossing border area these port cities are having in view are analyzed. The intended purpose of the paper is to highlight the functional particularities of port cities and to elaborate a scenario of planning approach to their study implications promoted regeneration of socio-economic and ecological assessments.

  20. Strengthening river basin institutions: The Global Environment Facility and the Danube River Basin

    Science.gov (United States)

    Gerlak, Andrea K.

    2004-08-01

    Increased international attention to water resource management has resulted in the creation of new institutional arrangements and funding mechanisms as well as international initiatives designed to strengthen river basin institutions. The Global Environment Facility's (GEF) International Waters Program is at the heart of such novel collaborative regional approaches to the management of transboundary water resources. This paper assesses GEF-led efforts in the Danube River Basin, GEF's most mature and ambitious projects to date. It finds that GEF has been quite successful in building scientific knowledge and strengthening regional governance bodies. However, challenges of coordinating across expanding participants and demonstrating clear ecological improvements remain. GEF-led collaborative activities in the Danube River Basin reveal three critical lessons that can inform future river basin institution building and decision making, including the importance of appropriately creating and disseminating scientific data pertaining to the river system, the need for regional governance bodies for integrated river basin management, and the necessity to address coordination issues throughout project planning and implementation.

  1. Anatomia foliar de Polygonaceae (Angiospermae da planície de inundação do alto rio Paraná Leaf anatomy of Polygonaceae (Angiospermae from the upper Paraná river floodplain

    Directory of Open Access Journals (Sweden)

    Ismar Sebastião Moscheta

    2001-05-01

    Full Text Available A anatomia foliar de Polygonum acuminatum, P. ferrugineum, P. hydropiperoides, P. meisnerianum, P. punctatum, P. stelligerum, Ruprechtia laxiflora e Triplaris americana foi realizada com o objetivo de fornecer subsídios para a identificação destas espécies encontradas na planície de inundação do alto rio Paraná. Foram comparados a estrutura do limbo, em seção transversal, nervação, estômatos e pêlos da epiderme. Os gêneros Polygonum, Ruprechtia e Triplaris podem facilmente ser distinguidos através das características anatômicas: tipos de estômatos, pêlos glandulares, pêlos tectores das faces e dos bordos, nervura fimbrial e idioblastos epidérmicos. As espécies de Polygonum podem ser distinguidas através dos pêlos tectores, cavidade epidérmica e, mais dificilmente, pelas aréolas e terminações das nervurasLeaf anatomy of the following Polygonaceae Polygonum acuminatum, P. ferrugineum, P. hydropiperoides, P. meisnerianum, P. punctatum, P. stelligerum, Ruprechtia laxiflora and Triplaris Americana was carried out as an aid towards the identification of these species found in the upper Paraná river floodplain. The leaf blade structure in transversal section, veins, stoma and epidermal trichome were compared. The genera Polygonum, Ruprechtia and Triplaris are easily distinguishable through their anatomical features: stomatal types, glandular trichomes, surface and edge non-glandular trichome, fimbria vein and epidermal idioblasts. Polygonum species are distinguishable through non-glandular trichomes, epidermal cavity and, with some difficulty, through areolas and veinlets

  2. Analysis of large Danube flood events at Vienna since 1700

    Science.gov (United States)

    Kiss, Andrea; Blöschl, Günter; Hohensinner, Severin; Perdigao, Rui

    2014-05-01

    Whereas Danube water level measurements are available in Vienna from 1820 onwards, documentary evidence plays a significant role in the long-term understanding of Danube hydrological processes. Based on contemporary documentary evidence and early instrumental measurements, in the present paper we aim to provide an overview and a hydrological analysis of major Danube flood events, and the changes occurred in flood behaviour in Vienna in the last 300 years. Historical flood events are discussed and analysed according to types, seasonality, frequency and magnitude. Concerning historical flood events we apply a classification of five-scaled indices that considers height, magnitude, length and impacts. The rich data coverage in Vienna, both in terms of documentary evidence and early instrumental measurements, provide us with the possibility to create a relatively long overlap between documentary evidence and instrumental measurements. This makes possible to evaluate and, to some extent, improve the index reconstruction. While detecting causes of changes in flood regime, we aim to provide an overview on the atmospheric background through some characteristic examples, selected great flood events (e.g. 1787). Moreover, we also seek for the answer for such questions as in what way early (pre-instrumental period) human impact such as water regulations and urban development changed flood behaviour in the town, and how much it might have an impact on flood classification.

  3. Measurement of tritium in the Sava and Danube Rivers.

    Science.gov (United States)

    Grahek, Željko; Breznik, Borut; Stojković, Ivana; Coha, Ivana; Nikolov, Jovana; Todorović, Nataša

    2016-10-01

    Two nuclear power plants (NPP), the KrškoNPP (Slovenia) on the Sava River and the Paks NPP (Hungary) on the Danube River, are located in the immediate vicinity of Croatia and Serbia. Some of the radioactivity monitoring around the NPPs involves measuring tritium activity in the waters of rivers and wells. The authors present the tritium measurement results taken over several years from the Sava and Danube Rivers, and groundwater. The measurements were carried out in two laboratories including an impact assessment of the tritium released into the rivers and groundwater. The routine methods for determining tritium (with/without electrolytic enrichment) were tested in two laboratories using two different instruments, a Tri-Carb 3180 and Quantulus 1220. Detection limits for routine measurements were calculated in compliance with ISO 11929 and Currie relations, and subsequently the results were compared with those determined experimentally. This has shown that tritium can be reliably determined within a reasonable period of time when its activity is close to the calculated detection limit. The Krško NPP discharged 62 TBq of tritium into the River Sava over a period of 6 years (23% of permitted activity, 45 TBq per year). The natural level of tritium in the Sava River and groundwater is 0.3-1 Bq/l and increases when discharges exceed 1 TBq per month. Usually, the average monthly activity in the Sava River and groundwater is maintained at a natural level. The maximum measured activity was 16 Bq/l in the Sava River and 9.5 Bq/l in groundwater directly linked to the river. In the majority of water samples from the Danube River, measured tritium activity ranged between 1 and 2 Bq/l. The increased tritium levels in the Danube River are more evident than in the Sava River because tritium activity above 1.5 Bq/l appears more frequently on the Danube River. All measured values were far below the allowed tritium limit in drinking water. Dose assessment has shown that

  4. Danube Soya – Improving European GM-free soya supply for food and feed

    Directory of Open Access Journals (Sweden)

    Krön Matthias

    2015-09-01

    Full Text Available The Danube Soya Association is an international, voluntary, non-profit, non-governmental association promoting sustainable and GMO**-free soya production along the Danube River Basin – from Switzerland to the Black Sea. Founded in 2012 the association counts today more than 200 members from the whole value chain and civil society in 16 European countries. The members share the vision of a protein transition towards more European and more sustainable protein sources for food and feed. The Danube Area is an area of large potential agricultural surpluses and Danube Soya promotes the idea of using these surpluses to replace a part of the imported soya. The goals of the association are to increase value-added in the rural economies of Central Eastern Europe, promote European cooperation as well as a production of constant and sustainable local soya sources. The Danube Soya Association runs a certification scheme that reaches from soya seeds all the way to final products, which can be labelled with the consumer label “Fed with Danube Soya” (for animal products and “Danube Soya” (for soya food products. Together with its partners, the Danube Soya Association implements and supports dissemination and research projects on different topics.

  5. Isochron burial dating of Danube terraces in the course of an interlaboratory comparison on sample preparation in Vienna and Budapest

    Science.gov (United States)

    Neuhuber, Stephanie; Ruszkiczay-Rüdiger, Zsófia; Decker, Kurt; Braucher, Regis; Fiebig, Markus; Braun, Mihály; Häuselmann, Philipp; Aster Team

    2016-04-01

    The Neogene development of the Vienna Basin's tectonic history is well-documented in seismic sections and hydrocarbon wells. The late Neogene to Quaternary history is less well preserved due to a gap in the sediment record starting from the Late Pannonian due to a large-scale uplift during a phase of basin inversion [1]. Quaternary sediments in the Vienna Basin form prominent Pleistocene terraces north and south of the Danube's recent floodplain. The Danube's course currently shifts to the south where it erodes into its own gravel terraces that were presumably accumulated during the Pliocene and Early to Middle Pleistocene. North of the Danube, a wide alluvial plain has developed with one prominent Middle Quaternary terrace level 17-25 m above the river (Gänserndorf and Schlosshof Terraces). The most recent tectonic events related to the sinistral movement of the Vienna Basin transform fault system are recorded north of the Danube by faulted terrace segments that were identified by paleoseismological trenching in combination with OSL [2]. In contrast, terraces south of the Danube form a staircase with altitudes ranging between 25 and 130 m above todays water level. The terraces in the south have also been strongly dissected by faults [3], each fault block preserved a slightly different succession of terraces. The fault-related vertical displacements south of the Danube have not yet been quantified. To better understand the Quaternary terrace sequence and its displacement in the southern zone, we use the cosmogenic nuclide pair of 26Al and 10Be for isochron burial dating of a Danube terrace at Haslau an der Donau (~40 m above river level). This terrace is locally the lowest of a staircase of a total of 6 different levels. Based on published geomorphological works, the expected age is Middle Pleistocene. The isochron burial dating method is therefore well-suited to date this sedimentary setting due to the presence of large individual clasts that share the same post

  6. HYDROLOGICAL FORECASTS OF DANUBE FLOOD 2013 BY THE HUNGARIAN HYDROLOGICAL FORECASTING SERVICE

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    A. CSÍK

    2014-10-01

    Full Text Available The significant lead time resulting from the use of the OLSER system of the Hungarian Hydrological Forecasting Service is of key importance in making timely preparations for flood defence. Due to continuous improvements to the quantitative meteorological forecast models (primarily the generally used ECMWF model and the OLSER system over the past years, we have by now reached a point where the previously separately managed flood peak forecasting and continuous forecasting can no longer be interpreted independently. Continuous forecasting taking into account precipitation forecasts and monitoring spatial changes of the complex physics-based concentration process also offers a level of accuracy suitable to identify peak values. The flood wave of June 2013 along the Hungarian Danube section exceeded the ever observed highest high water levels everywhere (except for gauge Mohács. The forecasts prepared by HHFS played a crucial role both in terms of lead time and the forecasted water levels.

  7. Feeding and morphological analysis of the digestive tract of four species of fish (Astyanax altiparanae, Parauchenipterus galeatus, Serrasalmus marginatus and Hoplias aff. malabaricus from the upper Paraná River floodplain, Brazil

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    D. Peretti

    Full Text Available The present study is inspired by the great wealth of species exhibited by the ichthiofauna. Not only concepts and techniques of ecology deserve attention, but also knowledge in other biological areas, such as zoology and anatomy, are necessary. The intention of the present work is to discover the morphology of fish through the study of the digestive tract morphology, associating it to diet data, in order to better understand the biology of four fish species of the upper Paraná River floodplain. The samples were collected quarterly in the year 2000 with gillnets of different meshes. The stomach content was analyzed under a stereoscopic microscope and the frequencies of occurrence (FO and volumetric (FV and the alimentary index (IAi were calculated. Various morphologic characteristics were analyzed and schematized using a light chamber. The species were grouped into two trophic guilds - insectivores (Astyanax altiparanae and Parauchenipterus galeatus and piscivores (Serrasalmus marginatus and Hoplias aff. malabaricus. The first two, although consumers of insects, preyed on different alimentary groups, notably Hymenoptera in the case of A. altiparanae and Coleoptera in the case of P. galeatus. Serrasalmus marginatus and H. aff. malabaricus consumed mainly fishes. However, only pieces of prey were usually found in the stomach content of the first species, whereas whole fishes were found in the stomach content of the second. Astyanax altiparanae exhibited characteristics that allowed it to obtain food in several compartments of the water column. Similarly P. galeatus consumed food resources that were available in all aquatic compartments, although the abilities to capture, to manipulate and to absorb food differed, as shown by the importance of teeth plates and pharyngeal teeth. Serrasalmus marginatus and H. aff. malabaricus, although resembling each other in many aspects of the digestive tract morphology, differed in the strategies used to capture

  8. Ecological estimation of the possible variants new Ukrainian shipping way between the Danube and the Black Sea

    Science.gov (United States)

    Berlinsky, N.

    2007-05-01

    The better way or optimal variant means economic advisability of organization and using the way and the same time minimization of anthropogenic press. The first problem's factor is - all kinds' variants cross the area of the Danube Biosphere Reserve. The next factor is - all kinds of variants need dredging works in the sea shallow water so called bar's zone for marine entrance channel. As for natural factors there are also two. The first one is a long term delta evolution and the second is the process of water discharge redistribution. If the human influence to the first factor is still limited the second factor's influence can be unlimited - it is easy to do by jetty or dams construction. At present there are nine possible variants of the DWW: Variant 1. It is an artificial canal built as an ameliorative at 80-s between the Danube and Sasik liman. It provokes the water discharge redistribution up on 16.6% from the Danube run off (from the total Q=3000 m3/c for 54 km), hydrological regime in Ukrainian delta and ecological conditions will be sharply worsened. This project supposed a giant dredging works. Variant 2. The Project of engineer P.S. Chekhovich (1904). The length of the canal is 10 km. (The problems are: it is an artificial canal, needs the bridge, cross the wetlands area, redistribute water discharge from the Danube). Variant 3. Solomonov branch - Zhebryany bay modern Project by engineer V.P. Zizak (2000), The problems are: it is an artificial canal also, but with locks, needs the bridge, to cross the wetlands area, the water discharge redistribution from the Danube up on 2.27% (from the total Q=3000 m3/c for 54 km). The length of the canal is 9 km. Two last variants have orientation from Solomonov arm to Zhebriany bay. The other variants of DWW linked with Ochakovsky and Starostambulsky arms systems. Ochakosky system is dying off system from geological point of view. There are two arms which can be examined for DWW - Prorva arm and Potapovo arm. Besides

  9. ANTHROPIC IMPACT ON AIR QUALITY IN THE DANUBE REGION

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    VOINA A.

    2016-07-01

    Full Text Available There were monitored by data acquisition both in summer and winter period, the concentrations of pollutants - SO2, NO2 and particulate matter (PM10 – existing in air on the territory of 6 counties bordering the Danube. After processing and analysis of collected data have been found that: SO2 pollution may be due primarily burning fuel with high sulfur content and / or industrial activities for carbonic products (anodes for obtaining the electrolytic aluminum, graphite electrodes etc.; pollution with NO2 comes primarily from automobile exhaust gases; particulate matter pollution may be due both loess soil (high winds in dry periods characteristic of the area i

  10. Adaptive Management on Danube Delta’s Biodiversity

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    Ildiko Ioan

    2014-04-01

    Full Text Available Biodiversity is a heritage of life that could hold the information needed for the wellbeing of human kind. The challenge of biodiversity preservation was addressed by various management solutions, the newest being the adaptive management. The paper aims to give insights for the application of adaptive management and to reveal its potential for increasing the effectiveness of ecosystem management in the Danube Delta. Carefully designed adaptive management action plans could allow important improvements in the information base that support decisions related to reed valuation.

  11. The River Danube: An Examination of Navigation on the River

    Science.gov (United States)

    Cooper, R. W.

    One of the definitions of Navigation that gets little attention in this Institute is (Oxford English Dictionary), and which our French friends call La Navigation. I have always found this subject fascinating, and have previously navigated the Rivers Mekong, Irrawaddy, Hooghly, Indus, Shatt-al-Arab, Savannah and RhMainKanal (RMDK) and the River Danube, a distance of approximately 4000 km. This voyage has only recently become possible with the opening of the connecting RMDK at the end of 1992, but has been made little use of because of the civil war in the former Yugoslavia.

  12. 25th Conference on Robotics in Alpe-Adria-Danube Region

    CERN Document Server

    Borangiu, Theodor

    2017-01-01

    This book presents the proceedings of the 25th International Conference on Robotics in Alpe-Adria-Danube Region, RAAD 2016 held in Belgrade, Serbia, on June 30th–July 2nd, 2016. In keeping with the tradition of the event, RAAD 2016 covered all the important areas of research and innovation in new robot designs and intelligent robot control, with papers including Intelligent robot motion control; Robot vision and sensory processing; Novel design of robot manipulators and grippers; Robot applications in manufacturing and services; Autonomous systems, humanoid and walking robots; Human–robot interaction and collaboration; Cognitive robots and emotional intelligence; Medical, human-assistive robots and prosthetic design; Robots in construction and arts, and Evolution, education, legal and social issues of robotics. For the first time in RAAD history, the themes cloud robots, legal and ethical issues in robotics as well as robots in arts were included in the technical program. The book is a valuable resource f...

  13. THE ROLE OF THE HYDROLOGICAL FACTOR IN HABITAT DYNAMICS WITHIN THE FLUVIAL CORRIDOR OF DANUBE

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    GH. CLOŢĂ

    2012-03-01

    Full Text Available The role of the hydrological factor in habitat dynamics within the fluvial corridor of Danube. This paper had explored the connections between river hydrology with its changes and habitat dynamics. The fluvial corridor integrates spatially the channel and parts of its floodplain affected by periodical flooding and could be considered as an ecological corridor because of the size of the hydrosystem. The river and its ecosystems depend on geomorphogenetic and biological function and, thus creating a inter-dependence transposed into a concept, namely the fluvial hydrosystem, proposed firstly by Roux 1982, Amoros 1987. The hydrosystem is an ecological complex system constituted of biotopes and specific biocenoses of stream waters, stagnant water bodies, semi-aquatic, terrestrial ecosystems localized in the space of floodplain modeled directly and indirectly by river’s active force.

  14. Environmental influences on the composition and structure of the freshwater mussels in shallow lakes in the Cuiabá River floodplain

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    AC. Colle

    Full Text Available The maintenance of the freshwater mussels' community in lakes is determined by abiotic factors at the local scale and at regional scale by interspecific relations between the larvae of bivalves and fish host. Whereas the distribution pattern at local scale, our goal was to understand the abundance and community composition of bivalves and relate the environmental agents structuring this community. We sampled 20 lakes in the floodplain of the Cuiabá River using a standardized method of sampling. To evaluate the effect of environment on the community we applied multivariate inferential analyses. We found 1.143 individuals alive belonging into six species distributed at the family Hyriidae, Mycetopodidae, Sphaeridae and Corbiculidae. The results showed that in the Pantanal the bivalve assemblage structure is influenced locally by organic matter and particle size, variables that reflect the intense interactions between water-sediment. However it is important to emphasize that these environmental characteristics are the result of the dynamics of this system which is dependent on the flood pulse, a regional factor.

  15. Fluvial inheritances of the Cher River floodplain (region Centre, France) as elements of characterization of hydrological dynamics and their past evolutions

    Science.gov (United States)

    Vayssière, Anaëlle; Castanet, Cyril; Gautier, Emmanuèle; Virmoux, Clément

    2015-04-01

    -mineral clayey deposits, characteristic of a swampy environment disconnected most of the time from the main river. (3) Finally, the upper part is constituted by a silty layer that may be attributed to an increase in fluvial activity or in erosion dynamics (slope of the catchment, local filling processes …) These first results show a good record of palaeo-environnemental changes in the Cher valley. The comparison with similar works conducted in other catchments of the "Bassin de Paris" shows that these records may describe environmental evolutions during the Pleniglacial, Lateglacial and Holocene. The perspectives of this work is to provide relevant data on the readjustment of the river related with climate changes since the LGM and on the part played by climate changes and ancient societies on the fluvial system during the Holocene.

  16. The Danube, the Leading Actor of European Identity

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    Florin Iftode

    2016-08-01

    Full Text Available The regional policy is a strategic investment policy, which aims at stimulating the economic growth of all EU regions and cities and to improve quality of life. It is also an expression of solidarity, as it focuses on helping the less developed regions. The Regional policy aimed at EU regions and cities, stimulating the economic growth and improving the quality of life through strategic investments. It is also an active form of solidarity, which targets to support the less developed regions. Regional policy benefits from the biggest part of the EU budget for 2014-2020 (351.8 billion Euros out of a total of 1082 billion and is therefore the main investment instrument of the Union. With an area of about 800,000 km (occupying one fifth of the EU's area and with a population of over 100 million, the Danube Region is vital for Europe. Danube basin has a number of advantages that can enable the development of its rapid geographical position (opening to the east; cultural, ethnic and natural; sources of renewable energy (hydro, biomass, wind and thermal; benefits related to the environment (flora and fauna, water resources, Delta.

  17. Preliminary Data on the Ecological Requirements of the Invasive Spiny-Cheek Crayfish in the Lower Danube

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    Pîrvu Mălina

    2014-12-01

    Full Text Available Water quality and properties of the riverbed often shape the community structure of aquatic ecosystems, occasionally sustaining the expansion of non-native species. This study aims to provide preliminary data on the ecological preferences of the invasive species Orconectes limosus, its control, and the protection of the native stock is an European priority. In order to assess the species ability to colonize small river systems, relevant tributaries in the invaded Danube sector were monitored. Statistical test indicates a preference for deep and warm rivers, low water velocity and also high concentrations of calcium.

  18. Limnology of the Touw River floodplain

    CSIR Research Space (South Africa)

    Allanson, BR

    1983-12-01

    Full Text Available This report is the summary of a larger two-volumed work originally presented to the Coastal Lakes Working Group in 1981. The floodplain is in essence a series of small, shallow lakes, running in an east-west direction between the village...

  19. Media-Competence as Precondition of the Students’ Intercultural Competence Formation of the Danube Region

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    Anastasia Hrekova

    2015-08-01

    Full Text Available The unity of Europe, including countries of the Danube region, takes into account a variety of national cultures. One of the priority tasks of European society development is the mutual enrichment of intellectual values and at the same time national identity preservation. The article deals with the role of media-education of the effective cooperation development of ethnic cultures. Media literacy is analyzed as a precondition for the formation of intercultural competence of student youth from the Lower Danube Region. The mechanisms of adequate perception formation of cultural differences through the students’ media-competence education of the Danube region are under analysis.

  20. The influence of the geomorphological factors on the relief modelling within Eselnita hydrographic basin (Danube catchment/Romania

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    DANIELA VLAD

    2012-08-01

    Full Text Available Developed on the south-eastern side of Almãjului Mountains, Eşelniţa drainage basin neighbours upon the following basins: upon S – SV with Mala, upon SV - V with Mraconia, upon V – NV with Berzasca, upon NV - NNE with Nera and on the NNE – SE direction with Cerna. The basin has a surface of 77 km2 and present a 5th degree hydrographic network according to Horton-Strahler ranking system, tributary to Danube by means of Eşelniţa main collector. Developed in a mountain landscape, the basin presents different levels held between minimum altitude of 64 m at the confluence with the Danube and maximum altitude of 1107 m, thus presenting a difference of 1043 m. Geological formations within the basin belong predominant to the Danubian Domain, so in central and upper courses, these are represented by a crystalline foundation and by magmatic rocks of intrusive nature covered by very small areas of sediment located in the northwest (belong to the Lower Jurassic and in the south-eastern (belongs to the Upper Cretaceous of the basin. But in the lower course, there are both crystalline and the sedimentary formations, last being integrated to Orşova depression and whose presence is related to the evolution of the Danube. Morphometric indices of Eşelniţa basin allows the distinction of a higher sector, mountainous terrain with high energy under a relatively increased fragmentation and depression sector with low relief energy and also with an intense fragmentation of the existing sedimentary rocks wich favors erosion manifestation in the context of deforestation action.

  1. 黄泛平原小网格农田林网的风场特征%Wind field characteristics of small farmland shelterbelt network in Yellow River floodplain

    Institute of Scientific and Technical Information of China (English)

    邴贝贝; 李传荣; 许景伟; 黄超; 程玲

    2013-01-01

    有效控制黄泛平原风沙危害对于农业增产增收具有重要的意义,以山东省菏泽市鄄城县黄河滩区3种主林带林龄(分别为4a、6a和8a)的等面积小网格(分别记为网格1、2、3)农田林网为研究对象,通过空间多点观测,研究网格内风场的空间分布特征及其防护效能.结果表明:主林带树高或林龄对林网内风速的变化有较大影响,防风效能和防护面积随着主林带树高的增加而增大.林网内风速的半方差函数分析表明,3种网格内风速理论变异模型分别为高斯模型、球型模型和球型模型,而且有强烈的空间自相关性,其自相关性大小和空间连续性与主林带林龄密切相关,表现为网格1<网格2<网格3.以降低风速30%~50%为标准确定有效防护面积,3种网格的平均有效防护面积比分别为31.0%、40.7%和46.7%.总体上,相同面积林网的防护效能随林带树高增大而增大.研究成果可为农田林网的可持续经营提供理论依据.%Controlling wind-sand disaster plays an importance role inincreasing agricultural productivity effectively in Yellow River floodplain area.The spatial distribution characteristics of wind field and protective effectiveness of three same size farmland shelterbelt networks,named network 1,2 and 3,withdifferent main forest belt ages (i.e.4 a,6 a and 8 a),were analyzed by multi-point observations in lowland of the Yellow River in Juancheng County,Heze City,Shandong Province.The results indicated that the main forest belt height and age had strong influences on the wind speed within the forest networks and their wind-break function and wind-break area increased with the main forest belt height increasing.The wind speed analysis of semivariance results in 3 forest networks showed that their variation models of wind speed were Gaussian model,Spherical model,and Spherical model,respectively,and there were strong spatial autocorrelations,in addition

  2. Interpretations and Implementation of the Regulations on the Protection of Danube Delta Biosphere Reserve

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    Dorin Matei

    2015-08-01

    Full Text Available The Danube Delta Biosphere Reserve, part of the UNESCO world patrimony since 1992, enjoys an enhanced legislative protection regarding the protection of fauna and flora. In Romania we find the legislation in the field of traffic regulations on ships and boats on the Danube, on canals and inland lakes in the Danube Delta area, and in fisheries and protection of animals and plants. The state of the environment in the Danube Delta Biosphere Reserve is constantly analyzed, achieving annual public reports. The aim of the paper is the interpretation of legal provisions both in the field, making proposals de lege ferenda for the smooth running of traffic and environmental protection in the Delta.

  3. Solutions for environmental problems of Danube river; Soluciones para la problematica ambiental del Danubio

    Energy Technology Data Exchange (ETDEWEB)

    Wildschut, L. [Haskoning, S.A. (Spain); Martinez de Bascaran, G. [Adecagua (Spain)

    1995-06-01

    A summary of the study on the environmental problems of Danube in some countries of the European Union is given. This study proposes strategic solutions in order to stop the environmental degradation in this area.

  4. Sustainable planning and tourism development policy exemplified by medieval fortresses along the river Danube

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    Belij Srđan

    2014-01-01

    Full Text Available The coastal area of the Danube had the greatest strategic importance in the preservation of the waterway, which was the most important road in this part of Europe until the late 19th century. On the banks of the Danube were located the cradle of many civilizations that were built by European values and identities created by different people. As a natural border Danube has played a significant role in military strategy in the struggle for supremacy and domination of European territories, which are the most significant and most monumental fortress in Serbia, built right on the banks of the Danube. Cultural Route „Fortresses on the Danube“, which floats our sector of the Danube, displays our most important monuments of military architecture in this part of Serbia, the preserved remains of seven fortresses: Bač, Petrovaradin, Belgrade, Smederevo, Ram, Golubačka and Fetislam. Mentioned fortress are an important resource for sustainable tourism development and an important part of the cultural corridor not only in Serbia, but also South-Eastern Europe, which value is recognized by UNESCO. A special segment of the tourism industry in the development of the Danube region represents the development of geotourism as tourism specific niche markets Danube fortresses, and other objects of natural and cultural heritage of the Danube basin is recognized as an interesting tourist destinations and sites worth visiting and retention during a cruise on the Danube. Protection of cultural heritage as a unique and irreplaceable wealth, is very important for the Republic of Serbia and the Danube Region. The development of „cultural routes“ and other forms of cluster connectivity properties of cultural heritage will help better interpretation of heritage and the creation of cooperative networks that will provide obtaining the status of an important heritage resource in the development of cultural tourism and to be involved in politics purposeful tourism

  5. The Legal Status of the Danube Delta Biosphere Reservation

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    Florica Brasoveanu

    2012-05-01

    Full Text Available In recent years the world has become aware that natural resources are not inexhaustible, that manyspecies are threatened with extinction and that is is necessary to strive for judicious use of natural resources tofulfill the needs of the present without compromising the ability of future generations to meet their needs(principle of sustainable development. To conserve species and habitats protected areas have beenestablished worldwide. The protected area is a geographically defined area, with rare natural elements and / orendangered species, regulated and managed in order to achieve specific conservation objectives. Althoughranked Europe's second in size (after the Volga River and the 20th in the world, because of the rich landscapeand wildlife, with the birds ranked most important, the Danube Delta has a very special interest scientificallyas it is a natural laboratory of forming delta, tourism and economic ecosystems, through its renewable naturalresources of which the most important resources are living aquatic resources.

  6. Variability of summer-time precipitation in Danube plain, Bulgaria

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    Nikolova Nina

    2005-01-01

    Full Text Available Over the recent years the climate extremes like as drought and floods become more often and have negative impact on human society. That is way it is very important to know the peculiarities of precipitation variability. The paper investigates precipitation variability during summer time in one of the most important agriculture region in Bulgaria - Danube Plain. The summer-time is determined for the period May - October. The study is based on monthly precipitation total for the period 1961-2005. The precipitation variability is analyzed by comparison with the period 1961-1990, determined by World Meteorological Organization as "contemporary climate". In order to investigate the precipitation variability the various indices lake as Percent of Normal, Rainfall Anomaly Index and Cumulative Anomaly have been calculated. Two wet spells (1865-1983 and 1993-2005 and one dry spell (1983-1993 have been identified. The Kriging interpolation has been applied for presenting special distribution of precipitation variability.

  7. Originality of Foreign Language Teaching Technologies in Higher Educational Establishments of the Danube River Basin Countries

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    Olga Demchenko

    2014-08-01

    Full Text Available The article is aimed at investigating the originality of foreign language teaching technologies in higher educational establishments of the Danube river basin countries. Definitions of teaching technologies, typology of some foreign language teaching technologies, analysis of activity learning technologies are given. The stress is made on the importance of competence and communicative approaches in Maritime English teaching in the Danube basin higher educational establishments.

  8. Tourist ships on the Danube as an opportunity for export of meat and meat products

    OpenAIRE

    Tešanović Dragan; Vuksanović Nikola; Kalenjuk Bojana; Portić Milijanko

    2015-01-01

    Tourism development launches growth of other complementary industries. River tourism, as a special selective tourism form, experiences intensive development, with an importance for all the regions through which the Danube, as an integral part of the Rhine - Main - Danube waterway, flows. During cruising, the largest consumption is achieved on the ship itself, where meat and meat products are an integral element of every meal and represent the most expensive component of the dish. The task of ...

  9. Social Media Interactions and Online Games - Building up New Human Relationships in Danube Region

    OpenAIRE

    Predrag K Nikolić

    2015-01-01

    In this paper we are trying to explore possibilities of using online environment, multiplayer gaming culture and social media networks to engage people in the Danube Region around social, multi-cultural and environment initiatives. The Danube Region online community could become a new cultural phenomena, technology mediated, built on human interactions, common interests and cultural heritage which open space for future humancentered social and infrastructural design initiatives...

  10. Danube Soya – Improving European GM-free soya supply for food and feed

    OpenAIRE

    2015-01-01

    The Danube Soya Association is an international, voluntary, non-profit, non-governmental association promoting sustainable and GMO**-free soya production along the Danube River Basin – from Switzerland to the Black Sea. Founded in 2012 the association counts today more than 200 members from the whole value chain and civil society in 16 European countries. The members share the vision of a protein transition towards more European...

  11. Danube Soya – Improving European GM-free soya supply for food and feed

    OpenAIRE

    Krön Matthias; Bittner Ursula

    2015-01-01

    The Danube Soya Association is an international, voluntary, non-profit, non-governmental association promoting sustainable and GMO**-free soya production along the Danube River Basin – from Switzerland to the Black Sea. Founded in 2012 the association counts today more than 200 members from the whole value chain and civil society in 16 European countries. The members share the vision of a protein transition towards more European...

  12. Plants accumulating heavy metals in the Danube River wetlands.

    Science.gov (United States)

    Matache, Marius L; Marin, Constantin; Rozylowicz, Laurentiu; Tudorache, Alin

    2013-12-20

    We present herein our results regarding the accumulation of four heavy metals (copper, cadmium, lead, and zinc) in four aquatic species plants (Ceratophyllum demersum, Potamogeton pectinatus, Potamogeton lucens, Potamogeton perfoliatus) collected from the Danube River, South-Western part of Romania and their possible use as indicators of aquatic ecosystems pollution with heavy metals. Elements concentration from the vegetal material was determined through Inductively Coupled Plasma - Mass Spectrometry. The species were chosen based on their previous use as bioindicators in aquatic ecosystems and due to the fact they are one of the most frequent aquatic plant species of the Danube River ecosystems within the Iron Gates Natural Park. Highest amounts are recorded for Ceratophyllum demersum (3.52 μg/g for Cd; 22.71 μg/g for Cu; 20.06 μg/g for Pb; 104.23 μg/g for Zn). Among the Potamogeton species, the highest amounts of heavy metals are recorded in Potamogeton perfoliatus (1.88 μg/g for Cd; 13.14 μg/g for Cu; 13.32 μg/g for Pb; 57.96 μg/g for Zn). The sequence for the bioconcentration factors (BCFs) calculated in order to describe the accumulation of the four metals is Cd > Zn > Pb > Cu. Increase of the zinc concentration determines an increase of the cadmium concentration (Spearman rho=0.40, p=0.02). Despite the low ambiental levels of heavy metals, the four aquatic plants have the ability to accumulate significant amounts, which make them useful as biological indicators. BCF value for Ceratophyllum demersum indicated this species as a cadmium hyperaccumulator.

  13. The Cooperation of the Danube Countries within the frames of the Priority Area 11 of the EU Strategy for the Danube Region /EUSDR/

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    Krasimir Koev

    2014-08-01

    Full Text Available The goal of this paper is to underline the importance of the issues, which are object of intervention within Priority 11 of the EUSDR, namely working together to tackle security and organized crime. The author has presented a large scale study on the security issues in European context, reflected in his PhD dissertation. Exploration of the existing EU programming documents and strategic plans for cooperation in the area of security. Through examining the progress of activities and results within the Priority area 11 of the EUSDR, the author outlines the contribution of all Danube countries for the cooperation in security within the Danube region. The paper can attract the attention of academics, stakeholders and NGOs on initiating of projects within the Priority area 11 of EUSDR. The added value of the paper is in finding the interconnection between guaranteeing the security in all its types within the Danube space and the prosperity of the region.

  14. Long-term evolution of the Lower Danube discharge and corresponding climate variations: solar signature imprint

    Science.gov (United States)

    Dobrica, Venera; Demetrescu, Crisan; Mares, Ileana; Mares, Constantin

    2017-07-01

    The possible changes in temperature and precipitation regime are expected to lead to changes in the water regime of rivers. In this study, we investigate the long-term evolution of Lower Danube discharge in connection to variations in the precipitation in the Upper-Middle and Lower Danube Basins. The analysis is given by using annual means data from four gauges along the river, on the Romanian territory, namely, Orsova, Ceatal, Sulina, and Sf. Gheorghe, and from 27 weather stations in the Danube Basin. The comparison of the average precipitation in the Upper and Middle Danube Basin, as calculated from the records of 17 weather stations, with the discharge at Orsova, at the entry in the Lower Danube segment, shows correlated interannual and multi-decadal variations. The variations in precipitation in the Lower Danube Basin, recorded at ten weather stations, show up to a certain degree in variations of the tributary rivers discharge and in the discharge difference between the upstream station Orsova and the downstream station Ceatal. The precipitation and discharge data from the two sub-basins have been examined from the viewpoint of multi-decadal variability associated with Atlantic variability and with solar variability at decadal and multi-decadal timescales. Significant variations at the two timescales have been found.

  15. Hydrological simulation of flood transformations in the upper Danube River: Case study of large flood events

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    Mitková Veronika Bačová

    2016-12-01

    Full Text Available The problem of understand natural processes as factors that restrict, limit or even jeopardize the interests of human society is currently of great concern. The natural transformation of flood waves is increasingly affected and disturbed by artificial interventions in river basins. The Danube River basin is an area of high economic and water management importance. Channel training can result in changes in the transformation of flood waves and different hydrographic shapes of flood waves compared with the past. The estimation and evolution of the transformation of historical flood waves under recent river conditions is only possible by model simulations. For this purpose a nonlinear reservoir cascade model was constructed. The NLN-Danube nonlinear reservoir river model was used to simulate the transformation of flood waves in four sections of the Danube River from Kienstock (Austria to Štúrovo (Slovakia under relatively recent river reach conditions. The model was individually calibrated for two extreme events in August 2002 and June 2013. Some floods that occurred on the Danube during the period of 1991–2002 were used for the validation of the model. The model was used to identify changes in the transformational properties of the Danube channel in the selected river reach for some historical summer floods (1899, 1954 1965 and 1975. Finally, a simulation of flood wave propagation of the most destructive Danube flood of the last millennium (August 1501 is discussed.

  16. CRUISE SHIP TOURISM ON THE DANUBE RIVER. CASE STUDY: CAPITALIZATION OF DELTAIC TOURISM POTENTIAL

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    IRINCU Elena

    2015-12-01

    Full Text Available Over the past two decades, river cruise tourism has witnessed a strong development, being preferred by more tourists each year, to the detriment of other forms of tourism. The presence of a plethora of attractive resources, concentrated along the inland waterways represents a particular offer for tourism development, through proper planning. However, in Romania, river cruise tourism is still incipient, even though cruises on the Danube are available, on a regular basis, since the 1970s. This research focuses on cruise ship tourism on the Danube, in particularly on the deltaic sector; with the Romanian ship MS Delta Star as a case study. Following, a brief presentation of the evolution of this type of tourism on the Danube River and its peculiarities on the Romanian sector, especially in the Danube Delta, was made. The assessment framework of the tourism potential of the Danube Delta at the level of administrative-territorial units was developed by applying the methodology from the National Spatial Plan. After correlating the results of the assessment with the current capitalization of tourism potential of the delta by the cruise ship included in the study, it is highlighted the need for optimizing the structure of the offer for this tourism sector. Identifying the most valuable elements of the Danube Delta, in terms of touristical attractions and including them to future itineraries for tourists on cruise ships guarantees a better capitalization of the tourism potential attracting therefore, a greater number of tourists.

  17. The Role of the Nobility in the Development of Navigation on the Danube (XIX - early XX centuries

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    Liliya Tsyganenko

    2013-08-01

    Full Text Available The questions of the place and role of the nobility of Bessarabia in the development of transport Infrastructure of the region in the late 19th - early 20th centuries is disscused. The activity of Prince Y. Gagarin - the first founder of shipping company on the Danube - Russian-Danube Shipping Company, which by 1886 evolved into a major joint-venture private limited transport in Bessarabia - Black Sea-Danube Shipping

  18. Long-term environmental radioactive contamination of Europe due to the Chernobyl accident - Results of the Joint Danube Survey 2013.

    Science.gov (United States)

    Maringer, Franz Josef; Ackerl, Claudia; Baumgartner, Andreas; Burger-Scheidlin, Christopher; Kocadag, Maria; Sterba, Johannes H; Stietka, Michael; Welch, Jan Matthew

    2017-02-27

    In the course of the Joint Danube Survey 3 (JDS3), coordinated by the International Commission for the Protection of the Danube River (ICPDR), laboratory ships travelled 2375km down the Danube River engaging in sampling, processing and on-board analyses during the summer of 2013. The results of the radiometric analysis of (90)Sr, (137)Cs and natural radionuclides in recent riverbed sediment are presented. The activity concentrations of (90)Sr and (137)Cs in Danube sediments have been found below 100Bq/kg.

  19. Flood risk analysis model in the village of St. George/Danube Delta

    Science.gov (United States)

    Armas, I.; Dumitrascu, S.; Nistoran, D.

    2009-04-01

    River deltas may have been cradles for prehistoric civilizations (Day et al. 2007) and still represent favoured areas for human habitats on the basis of their high productivity, biodiversity and favourable economical conditions for river transport (Giosan and Bhattacharya 2005). In the same time, these regions are defined through their high vulnerability to environmental changes, being extremely susceptible to natural disasters, especially to floods. The Danube Delta, with an area of 5640 km2, is the largest ecosystem of the European humid zones. Its state reflects environmental conditions at both local and regional levels via liquid and solid parameters and has to ensure the water supply for the local economy and communities. Flooding of the delta is important for the dynamics of the entire natural system. Floods sustain both alluvial processes and the water supply to deltaic lakes. In addition, flooding frequency is important in flushing the deltaic lake system water, ensuring a normal evolution of both terrestrial and aquatic ecosystems. For human communities, on the other hand, floods are perceived as a risk factor, entailing material damage, human victims and psychological stress. In the perspective of risk assessment research, every populated place faces a certain risk engaged by a disaster, the size of which depends on the specific location, existent hazards, vulnerability and the number of elements at risk. Although natural hazards are currently a main subject of interest on a global scale, a unitary methodological approach has yet to be developed. In the general context of hazard analysis, there is the need to put more emphasis on the problem of the risk analysis. In most cases, it focuses only on an assessment of the probable material damage resulted from a specific risk scenario. Taking these matters into consideration, the aim of this study is to develop an efficient flood risk assessment methodology based on the example of the village of St. George in

  20. Storm driven evolution and morphodynamic feedbacks. Sacalin spit, Danube delta

    Science.gov (United States)

    Zăinescu, Florin I.; Vespremeanu-Stroe, Alfred; Tătui, Florin; Constantinescu, Ştefan

    2015-04-01

    Deltaic spits are among the most highly dynamic and vulnerable coastal landforms rapidly changing their dimension, plan position and morphology. Sacalin barrier spit formed at the southernmost Danube mouth (Sfântu Gheorghe arm), representing the youngest downdrift feature of the Sfântu Gheorghe deltaic lobe (1500 BP - present). Sacalin emerged in 1897 aided by a major flood and developed by backwards migration and by constant elongation (towards south). Its evolution took place during a strongly anthropogenic influenced period of record high (19th century, beginning of the 20th century) and low solid discharge (late 20th century, beginning of 21 century) which reflects large scale land use and hydrotechnical works in the Danube watershed. With the use of an extensive database consisting in: historical maps, satellite imagery, orthophotos, bathymetric and topographic surveys, LIDAR data, long-term wind speed measurements, long-term wave hindcast data and sediment discharge records, the current study sheds new light on the evolution and behavior of transgressive deltaic islands and spits, and also on the evolution of the downdrift part of the Sfantu Gheorghe lobe by linking morphologic change and climatic variation. The Sacalin cycle appears to be different from past cycles by developing further offshore from the river mouth and by achieving in its last stage of evolution, a flying spit morphology. The high shoreline mobility of the narrow and low Sacalin barrier is mainly driven by coastal storms and associated processes: longshore and cross-shore sediment transport, overtopping, washover fan building and sediment transport during breaching. The barrier spit was frequently breached in the central part and, episodically it experiences large elongation and retreat rates (up to 500 m/year and 80 m/year). The in depth analysis performed on the evolution indices in correspondence with the storm climate and storm-induced sediment transport indicate that the long term

  1. Soil seed bank during succession at an abandoned pasture in the upper Paraná river-floodplain, Brazil - doi: 10.4025/actascibiolsci.v33i1.6391 Soil seed bank during succession at an abandoned pasture in the upper Paraná river-floodplain, Brazil - doi: 10.4025/actascibiolsci.v33i1.6391

    Directory of Open Access Journals (Sweden)

    João Batista Campos

    2011-02-01

    Full Text Available We evaluated density and species composition of the soil seed bank in active pasture and in secondary forest on a 10 year-old abandoned pasture to identify changes in density, richness, diversity and species composition during secondary succession of abandoned pastures. The implications of those changes for the forest recovery process were also considered. Soil samples were collected at Porto Rico island, state of Paraná, in 2007. The seedling emergence method was used. Data on active pasture collected in 1996, published by Campos and Souza (2003 were used for comparative analysis. No evidence was found of a pattern of changes in density of the soil seed bank during succession of abandoned pastures. We observed increases in richness and diversity, in the contribution of tree and shrub species and dominance of herb species for the seed bank during the first 10 years of abandonment of pastures in riparian forests. At the end of succession, the soil used as pasture can result in systems that are different from the original environment, due to seed bank impoverishment and presence of exotic species.We evaluated density and species composition of the soil seed bank in active pasture and in secondary forest on a 10 year-old abandoned pasture to identify changes in density, richness, diversity and species composition during secondary succession of abandoned pastures. The implications of those changes for the forest recovery process were also considered. Soil samples were collected at Porto Rico island, state of Paraná, in 2007. The seedling emergence method was used. Data on active pasture collected in 1996, published by Campos and Souza (2003 were used for comparative analysis. No evidence was found of a pattern of changes in density of the soil seed bank during succession of abandoned pastures. We observed increases in richness and diversity, in the contribution of tree and shrub species and dominance of herb species for the seed bank during the

  2. Holocene river history of the Danube: human-environment interactions on its islands in Hungary

    Science.gov (United States)

    Viczián, István; Balogh, János; Kis, Éva; Szeberényi, József

    2016-04-01

    A change in the frequency and magnitude of floods is the main response of river systems to climatic change. Natural floods are highly sensitive to even modest changes of climate. The discharge and the characteristics of floods basically determine the floodplain evolution and the feasibility of human land use and inhabitation on the islands and floodplains. The study revealed that those small islands of large rivers which have the surface rising only some meters above the river are particularly suitable research objects of Holocene climate variability as they are exposed to floods, react sensitively to environmental changes and their evolution may be paralleled with human history. The research area covers the islands of the Danube along the river between Komárom and Paks in Hungary, which is about 250 km, includes more than 50 smaller or formerly existing islands and two extensive islands: the Szentendre Island and Csepel Island. Data gathered from 570 archaeological sites of those islands from Neolithic to Modern Ages were analysed and interpreted in accordance with climate history and floodplain evolution. Nevertheless, the study is not only about river and its environmental history but it demonstrates the role of river and climatic variability in the history of mankind. The environment of the floodplain, the river hydrology, the sedimentation, the formation of islands and the incision and aggradation of surrounding riverbeds, the frequency of devastating floods have significantly changed through the historical time periods, which is reflected in the number and locations of archaeological sites on the islands. Their occupation history reflects the changes in discharge, climate, geomorphology, floods and human impacts and indicates historical periods with low or high probability of inundation. The most favourable periods for an island's occupation concerning the flood risk of its surfaces - and consequently of the banks along the river - are the first parts of a

  3. THE DANUBE STRATEGY AND ITS IMPACT ON THE PROCESS OF UKRAINE-EU RAPPROCHEMENT

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    Artem FYLYPENKO

    2014-10-01

    Full Text Available The research paper analyzes the impact of the Danube strategy on the process of Ukraine-EU rapprochement. The strategy itself is primarily a political document, which provides guidance to States in the region and the EU institutions to ensure the development of the Danube region. This document is unique in a number of parameters. First, its implementation will affect not only the eight Danube States - members of the EU, but also the neighboring countries of the EU. Secondly, it is a comprehensive document that covers not only the transport sector, but environmental issues, development of culture and tourism, education and many others. For Ukraine, the value of the Strategy is primarily due to the fact that in the context of the course of European integration this document provides additional opportunities for entry into the common European space. In addition, the Danube strategy can be considered as a tool for regional development. Strategy parameters cover four regions of Ukraine, located in the Danube River Basin - Odessa, Chernivtsi, Transcarpathian and Ivano-Frankivsk region.

  4. The evolution of Sf. Gheorghe (Danube asymmetric deltaic lobe

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    Alfred VESPREMEANU-STROE

    2014-11-01

    Full Text Available The wave asymmetric Sf. Gheorghe lobe is the only active in the Danube delta where river mouth bar (and the associated barrier islands and spits continuously deployed a cyclic development for almost two millennia. During first stage, the Sf. Gheorghe distributary had a small discharge (with an order of magnitude lower than present which after that experienced a rapid increase in consequence of the successive avulsions of Împuţita (southern distributary of Sulina arm and Dunavăţ distributaries. Our morphological analyses together with the newly obtained chronology, revealed the multiple ridgesets structure of Sf. Gheorghe deltaic lobe. In fact, all ridgesets (10 follow a common morphodynamic pattern characterized by the cyclic succession of three stages: i subaqueous mouth bar development, ii barrier island emergence, iii barrier spit phase with several secondary spits derived from an updrift trunk ridge. The size of each ridgeset increased exponentially with every new cycle due to the constant lengthening of the coastline as the downdrift side of the lobe advances seaward through a series of progressively larger similar quadrilaterals, yielding to a constant enlargment of the delta front size. 

  5. Identifying Efficient Nitrate Reduction Strategies in the Upper Danube

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    Angel Udias

    2016-08-01

    Full Text Available Nitrogen losses in the form of Nitrate (N-NO3 from point and diffuse sources of pollution are recognized to be the leading cause of water body impairment throughout Europe. Implementation of conservation programs is perceived as being crucial for restoring and protecting the good ecological status of freshwater bodies. The success of conservation programs depends on the efficient identification of management solutions with respect to the envisaged environmental and economic objectives. This is a complex task, especially considering that costs and effectiveness of conservation strategies depend on their locations. We applied a multi-objective, spatially explicit analysis tool, the R-SWAT-DM framework, to search for efficient, spatially-targeted solution of Nitrate abatement in the Upper Danube Basin. The Soil Water Assessment Tool (SWAT model served as the nonpoint source pollution estimator for current conditions as well as for scenarios with modified agricultural practices and waste water treatment upgrading. A spatially explicit optimization analysis that considered point and diffuse sources of Nitrate was performed to search for strategies that could achieve largest pollution abatement at minimum cost. The set of optimal spatial conservation strategies identified in the Basin indicated that it could be possible to reduce Nitrate loads by more than 50% while simultaneously provide a higher income.

  6. May cause environmental damage the diversion of the Danube in the Szigetköz area, Hungary?

    Science.gov (United States)

    Novak, Brigitta

    2009-04-01

    Summary The floodplain area between the main channel of Danube and its branch river Mosoni-Duna is called the Szigetköz. This wetland area has special flora and fauna, and it is a natural protection area. Underneath of the Szigetköz, there are a thick (several hundreds meters) sedimentary sequence, the so called Kisalföld Quaternary Aquifer. This aquifer system is fed by the surface river system of Danube and supplies excellent quality drinking water for several hundred thousands of people in Hungary and Slovakia. The Szigetköz Monitoring Network was established in 1991 to describe the environmental effects of the Bős-Nagymaros Dam System, which was partly built in 1992 on the Slovakian part of the Danube. The dam diverts three-quarter of the Danube runoff to a 40 km long artificial concrete channel north of the original river bed. The effect of this diversion is spectacular on the wetland area. Water level in the meandering channels have decreased significantly, part of the wetland area frequently becomes dry. The natural flow pattern has disappeared. As a consequence, the channel characteristics of the river network, therefore the flow pattern, the quantity and quality of surface and subsurface water on the upper region of the Danube have significantly changed. The aim of our research is to describe the relationship between surface water and groundwater and considering the variable geology of the area, to describe trends in chemistry and to find the possible reasons for extreme values. Also to detect possible connection between the extreme values and the changes in flow pattern caused by the human intervention. Water sample pairs from surface water and shallow and deeper ground water were taken in every season at 18 locations. To sample shallow ground-water 1,5 m long, screened metal probes were derived into the sediment at the possible nearest point to the surface water. On the field pH, temperature, dissolved oxygen, specific conductivity, and in the wells

  7. An Innovative Implication of the Atlas of European Values for Bridging Cultural Differences within the Danube Region

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    Juliana Popova

    2014-08-01

    Full Text Available The aim of this paper is to discuss the positioning of the Danube countries in the Atlas of European Values and to outline the possibility for the establishment of a common identity among the inhabitants of the Danube region on the basis of shared values and attitudes. Exploration of the prerequisites for an integrated cultural identity within the Romanian-Bulgarian cross-border region along the Danube river. Comparative study of the empirical data about the Danube countries, extracted from all data in the Atlas of European Values.: Identified similarities among the citizens of the Danube countries in relation to the components of their cultural identity. Outlined necessity for increasing the intercultural awareness of the inhabitants of the Danube region in order to overcome the existing cultural barriers and to create prerequisites for common cultural identity. The paper presents the applicability of the Atlas of European Values for wide range of studies in the area of cultural, societal and political sciences. The comparative study of the cultural similarities and differences of the Danube countries is the first of its kind and can serve as a basis of multilayer research of the values within the Danube region.

  8. Web-based modelling of energy, water and matter fluxes to support decision making in mesoscale catchments??the integrative perspective of GLOWA-Danube

    Science.gov (United States)

    Ludwig, R.; Mauser, W.; Niemeyer, S.; Colgan, A.; Stolz, R.; Escher-Vetter, H.; Kuhn, M.; Reichstein, M.; Tenhunen, J.; Kraus, A.; Ludwig, M.; Barth, M.; Hennicker, R.

    The GLOWA-initiative (Global Change of the water cycle), funded by the German Ministry of Research and Education (BMBF), has been established to address the manifold consequences of Global Change on regional water resources in a variety of catchment areas with different natural and cultural characteristics. Within this framework, the GLOWA-Danube project is dealing with the Upper Danube watershed as a representative mesoscale test site (∼75.000 km 2) for mountain-foreland regions in the temperate mid-latitudes. The principle objective is to identify, examine and develop new techniques of coupled distributed modelling for the integration of natural and socio-economic sciences. The transdisciplinary research in GLOWA-Danube develops an integrated decision support system, called DANUBIA, to investigate the sustainability of future water use. GLOWA-Danube, which is scheduled for a total run-time of eight years to operationally implement and establish DANUBIA, comprises a university-based network of experts with water-related competence in the fields of engineering, natural and social sciences. Co-operation with a network of stakeholders in water resources management of the Upper Danube catchment ensures that practical issues and future problems in the water sector of the region can be addressed. In order to synthesize a common understanding between the project partners, a standardized notation of parameters and functions and a platform-independent structure of computational methods and interfaces has been established, by making use of the unified modelling language, an industry standard for the structuring and co-ordination of large projects in software development [Booch et al., The Unified Modelling Language User Guide, Addison-Wesley, Reading, 1999]. DANUBIA is object-oriented, spatially distributed and raster-based at its core. It applies the concept of “proxels” (process pixels) as its basic objects, which have different dimensions depending on the viewing

  9. Review of the Distribution of the Family Gobiidae (Pisces in the Bulgarian Danube Tributaries

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    Velislav Y. Zarev

    2013-12-01

    Full Text Available The current study aims to give in detailed information on the actual distribution of the species from family Gobiidae in the Bulgarian Danube tributaries. All known literature has been revised and with the new data collected is given complete and actual information on their distribution. In the period 2010-2012 were sampled a total of 41 sites alongside each one of the Bulgarian Danube tributaries. The sampling started from the river mouths to upstream in order to discover what is the southern (upstream distribution of each one goby species. Four goby species were recorded from the tributaries – the round goby (Neogobius melanostomus Pallas, 1814, the monkey goby (Neogobius fluviatilis, the racer goby (Neogobius gymnotrachelus and the tubenose goby (Proterorhinus marmoratus. Further analysis showed preference of mixed substrates and silt in addition of homogenous ones. The occurrence of gobies in the studied tributaries decreased inversely proportional to distance from Danube.

  10. Application of multi-criteria analysis and GIS in ecotourism development (Case study: Serbian Danube region

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    Stojković Sanja

    2015-01-01

    Full Text Available Ecotourism can be defined as responsible travel to natural areas that conserves the environment and cultural heritage and improves the well-being of local people. Sustainable planning and management of ecotourism development are important and necessary for increasing positive and decreasing negative effects on the complex environment. This paper analyses the suitability of selected protected natural areas in the Serbian Danube region for the purposes of ecotourism development. The multi-criteria analysis includes several natural and socio-economic factors and criteria which influence ecotourism development. The integration of Geographic Information System (GIS and Analytic Hierarchy Process (AHP greatly facilitates the decision-making process in the ecotourism destination planning. A suitability map of the analysed protected natural areas for ecotourism development as one of the sustainable tourism types is highlighted as a result of this paper. Such analysis assists in the objective promotion of ecotourism destinations and thus contributes to the improvement of Serbian tourism development. [Projekat Ministarstva nauke Republike Srbije, br. 176008

  11. Aquatic and Sedimentary N-Isotope Dynamics in the Danube Delta Front

    Science.gov (United States)

    Möbius, Jürgen; Dähnke, Kirstin

    2014-05-01

    The North-Western Black Sea Shelf Region suffered from severe eutrophication in the past decades, mainly due to increased nutrient loads of the Danube River, the most important contributor of freshwater to this brackish sea. It is yet unclear whether the Black Sea shelf is at present on the way to recovery due to a recent decrease in nutrient discharge from the Danube River. During 2 cruises in summer and spring 2013 in the Danube River Delta/Black Sea transition zone, we analysed dissolved nutrients, and nitrate (and oxygen) isotope signatures in nitrate, suspended particulate matter, surface sediment and a sediment core from the shelf. Our rationale was two-fold: Firstly, we aimed to investigate N turnover and nutrient dynamics in the present Black Sea Shelf region to assess the effect of contemporary nutrient loads of the River Danube, and secondly, we wanted to compare these findings to the past situation as captured in the sediment record. Our data indicate intense draw-down of river-borne dissolved silica and phosphate in the transition zone, up to nutrient depletion in mesohaline waters in summer. Surprisingly, nitrate concentration follows a conservative mixing line. Despite this apparent conservative mixing of river nitrate with marine water, nitrate isotope trends confirm the importance of biological nitrate assimilation in the water column. Moreover, the relative enrichment of O to N isotopes in nitrate, following an unexpectedly steep slope of 2, suggests that this uptake cannot only be due to phytoplankton activity, which usually plots along a slope of 1. We accordingly investigated the potential effects of different nitrate turnover processes and specifically nitrate regeneration on its isotopic composition. Furthermore, notwithstanding significant nutrient input via benthic nutrient recycling, the N-isotope trend of sediment cores furthermore seems to provide a first hint towards improved water quality in the Danube Delta Front Region, possibly due

  12. Around or across the Carpathians: colonization model of the Danube basin inferred from genetic diversification of stone loach (Barbatula barbatula) populations.

    Science.gov (United States)

    Sedivá, Alena; Janko, Karel; Slechtová, Vendula; Kotlík, Petr; Simonović, Predrag; Delic, Antun; Vassilev, Milen

    2008-03-01

    Despite increasing information about postglacial recolonization of European freshwater systems, very little is known about pre-Pleistocene history. We used data on the recent distribution and phylogenetic relationships of stone loach mitochondrial lineages to reconstruct the initial colonization pattern of the Danube river system, one of the most important refuges for European freshwater ichthyofauna. Fine-scale phylogeography of the Danubian populations revealed five highly divergent lineages of pre-Pleistocene age and suggested the multiple origin of the Danubian stone loach. The mean sequence divergence among lineages extended from 7.0% to 13.4%, which is the highest intraspecific divergence observed so far within this river system. Based on the phylogeographical patterns, we propose the following hypothesis to relate the evolution and dispersal of the studied species with the evolution of the Danube river system and the Carpathian Mountains: (i) during the warmer period in the Miocene, the areas surrounding the uplifting Alps and Carpathians served as mountainous refuges for cold-water adapted fish and promoted the diversification of its populations, and (ii) from these refuges, colonization of the emerging Danube river system may have taken place following the retreat of the Central Paratethys. Co-existence of highly divergent mtDNA lineages in a single river system shows that range shifts in response to climatic changes during the Quaternary did not cause extensive genetic homogenization in the stone loach populations. However, the wide distribution of some mtDNA lineages indicates that the Pleistocene glaciations promoted the dispersal and mixing of populations through the lowlands.

  13. Ecological Network as a Factor in the Development of Tourism of Ukrainian Danube

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    Vyacheslav Todorov

    2015-08-01

    Full Text Available In the article the main components of the structural elements of the regional ecological network are analyzes. The main reserve for increasing the area of ecological network are such lands as pastures and hayfields, lands of water fund, as well as forests and wooded land. The article considers the distribution of the objects of Natural Conservation Fund on the Ukrainian Danube. It was found that the highest percentages of wilderness protection area are in administrative regions that have access to the Black Seas and Danube. It is shown that in the regional network is not fully represented all existing landscapes in the region.

  14. Education and Training Needs in the Field of Visitors Receiving Structures and Tourism Services in the Lower Danube Region

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    Gabriela Ţigu

    2010-11-01

    Full Text Available The paper analyzes the new realities and conditions for the development of tourism in the Lower Danube region in the context of the "Danube Strategy" of the EU, the state of the Bulgarian and Romanian tourist market, and the Romania market, as well as the possibilities for development of alternative tourism along the Danube. Special attention has been paid to the problems of education and training in the field of tourist facilities and services in Bulgaria and Romania and the need for their improvement. The reasons for this are that education and training are strategic factor for sustainable development trough contribution to human capital development, within the Romania- Bulgaria Cross-Border Cooperation Program 2007-2013. In relation to this the Academy of Economic Studies in Bucharest, Romania and D. Tsenov Academy of Economics in Svishtov, Bulgaria decided to collaborate in the field “Cooperation on human resources development – joint development of skills and knowledge”, through the development of cross-border liaisons and exchanges between the two universities. Both Bulgaria and Romania have represented and still represent important tourism destinations in Eastern Europe, promoting coastal tourism, spas, mountain resorts or heritage tourism. Comparing with the existent potential and with the other Central and East- European countries, including Bulgaria, Romania has modest economical performances in tourism industry. The last decade shows a relative decline of external demand for Romania, the main causes being the missing fund for investment in developing, modernization, and rehabilitation of specific infrastructure, the less diversification of the entertainment, the tourism services’ quality – lesser comparative with competitors. On other hand, in the same period, Bulgaria has improved the tourism services’ quality and economic performances. Training specialists in tourism is one of the ways of performance growth in this field

  15. Novas ocorrências de Lecane no plâncton de distintos ambientes da planície de inundação do alto rio Paraná = New occurrences of Lecane in plankton in different environments of the upper Paraná river floodplain

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    Ciro Yoshio Joko

    2008-04-01

    Full Text Available A planície de inundação do alto rio Paraná possui grande diversidade de rotíferos, com 288 táxons planctônicos registrados. Estudos realizados, nesse ecossistema, desde 1992, mostram que Lecanidae é a família mais especiosa, com 45 táxons registrados. Este trabalho teve como objetivo investigar a ocorrência dessa família em ambientes aindanão-estudados e consequentemente contribuir para a diversidade de rotíferos nessa planície de inundação. Foram registradas sete novas ocorrências de Lecane em amostras do plâncton: L. bifurca, L. rhytida, L. subtilis, L. crepida, L. bulla styrax, L. obtusa, e L.thienemanne. Embora os táxons descritos fossem encontrados no plâncton, essa família caracteriza-se por ser tipicamente não-planctônica. Dessa forma, visando ampliar o conhecimento sobre a diversidade dessa família na planície de inundação do alto rioParaná, estudos exclusivamente taxonômicos devem explorar a grande heterogeneidade de hábitats presente nessa planície, como, por exemplo, a região marginal e as extensas áreas colonizadas por macrófitas aquáticas.The upper Paraná river floodplain possesses a great diversity of rotifers, with 288 planktonic taxa recorded. Surveys performed in thisecosystem since 1992 have shown that Lecanidae is the most abundant family, with 45 registered taxa. The main goal of the present study was to investigate the occurrence of this family in environments that have not yet been studied. Seven new occurrences of Lecane were recorded in plankton samples: L. bifurca, L. rhytida, L. subtilis, L. crepida, L. bulla styrax, L. obtusa, and L. thienemanne. Although the described taxa were found in plankton, this family is characterized by being typically non-planktonic. As such, exclusively taxonomic studies must explore the great habitat heterogeneity in thisfloodplain, e.g., the littoral region and the extensive areas colonized by aquatic macrophytes, aiming to expand knowledge on the

  16. Spatial and temporal patterns of ciliate species composition (Protozoa: Ciliophora in the plankton of the Upper Paraná River floodplain Padrões espaciais e temporais da composição de espécies de ciliados (Protozoa: Ciliophora no plâncton da planície de inundação do Alto Rio Paraná

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    GM. Pauleto

    2009-06-01

    Full Text Available Spatial and temporal patterns of plankton ciliates species composition in the Paraná River floodplain were investigated. Samplings were carried out in twelve environments in two distinct hydrological periods (limnophase and potamophase. A total of 61 species of ciliates were recorded, and among them 21 are classified as pelagic while 40 are considered preferentially as littoral species. The registered species belong to eleven orders, and among them, Prostomatida was the most specious followed by Hymenostomatida and Peritrichida. The ciliate species composition was significantly distinct between periods, but not among environments. In this way, typically pelagic species characterized the ciliate community during the limnophase period, while the littoral species were predominant during the potamophase period. Our results strongly support the idea of the flood pulse as the main factor driving the composition pattern of the planktonic ciliates community in the Paraná River floodplain.No presente estudo foram investigados os padrões espaciais e temporais da composição de espécies de ciliados planctônicos na planície de inundação do Alto Rio Paraná. As amostras foram obtidas em 12 ambientes, em dois períodos hidrológicos distintos (limnofase e potamofase. Foram registradas 61 espécies de ciliados entre as quais 21 foram classificadas como pelágicas enquanto 40 foram consideradas preferencialmente litorâneas. As espécies registradas pertencem a 11 ordens, sendo Prostomatida foi a mais especiosa, seguida por Hymenostomatida e Peritrichida. A composição de espécies de ciliados foi significativamente distinta entre os períodos hidrológicos, enquanto que entre os ambientes, diferenças na composição não foram evidenciadas. Dessa forma, espécies tipicamente pelágicas caracterizaram a comunidade de ciliados na limnofase, enquanto que espécies litorâneas foram preponderantes para a composição de ciliados na potamofase. Os

  17. Conhecimento ecológico tradicional no fragmento da planície de inundação do alto rio Paraná: percepção ecológica dos pescadores Upper Paraná River floodplain fishermen’s traditional ecological knowledge: fishermen’s ecological feeling

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    Adriana Rosa Carvalho

    2002-05-01

    Full Text Available O conhecimento ecológico é uma sabedoria popular empírica acumulada pela prática de atividades em ambientes naturais. Alterações nos ecossistemas afetam o estoque dos recursos naturais explorados, bem como a prática tradicional deles dependente. Neste trabalho, é apresentado o conhecimento ecológico tradicional dos pescadores da planície de inundação do alto rio Paraná, regiões de Porto Rico (PR e Porto São José, Estado do Paraná. Um breve relato da teoria de fragmentação de habitats é apresentado, visto que esse ambiente está fragmentado pela construção de barragens de hidrelétricas. Três frases e um provérbio que revelam a dinâmica dos processos ecológicos dentre os pescadores foram anotados e confrontados com o conhecimento científico já reunido sobre a região. As frases demonstram uma interpretação popular em consonância com as descobertas científicas na planície. Essa sabedoria está ameaçada pela fragmentação da planície e pela perda da tradição, devido ao abandono da atividade pesqueira.The ecological knowledge is an empiric popular wisdom stored by the fishermen’s natural environmental practice. Changes in ecosystem affect the explored natural resources as well as the traditional practice dependent on them. This paper aims at presenting the upper Paraná river floodplain fishermen’s traditional ecological knowledge from Porto Rico (PR and Porto São José (PR regions. A brief comment on fragmentation theory is presented because of the floodplain fragmentation imposed by the construction of hydroelectric dams. Three phrases and one proverb, which reveal the dynamics of the fishermen’s ecological process, were registered and confronted with the scientific knowledge of the region. The phrases show a popular and traditional interpretation in agreement with the upper Paraná river floodplain scientific discoveries. The ecosystem fragmentation and loss of tradition, due to the fishery practice

  18. The applicability of an 87Sr/86Sr river isoscape to fish ecological questions in the Danube catchment

    Science.gov (United States)

    Zitek, A.; Irrgeher, J.; Sailer, K.; Trautwein, C.; Waidbacher, H.; Prohaska, T.

    2012-04-01

    Isoscapes are spatial maps of the distribution of isotopes on Earth. As a basis for ecological studies such as long distance migrations of animals or for determining the origin of food these tools are increasingly being developed, until now - mainly for terrestrial systems. In contrast, in case of aquatic systems only few maps were established up to now. As far as variation in the isotopic distribution in a studied area exists, the isotopic composition bears the potential to be used as natural tracer e.g. for ecological questions or food authentication. Above all the 87Sr/86Sr ratio taken up from the environment by organisms without any significant fractionation is known to provide a direct link to geologically distinct regions. Within the 'IsoMark' project (www.isomark.at), a database ('Isoscape Austria') containing all available spatially explicit isotope data (terrestrial and aquatic) with a focus on isotope distributions in Austrian rivers is being developed. Water samples from different rivers, mainly along the Danube in Austria, were collected and analyzed for their elemental and Sr isotopic composition. Analyses of water samples yielded several 'Isozones' along the Austrian part of the Danube, indicating diverse geology in these river catchments. Studying migration phenomena of fish using natural isotopic marks in hard parts is especially possible between these 'Isozones'. In geologically similar regions with little differences, element distributions or artificial marking methods (tagging, spiking) can serve as additional means. A significant positive relationship between the 87Sr/86Sr ratio in river water and the proportion of siliceous geological formations in the catchment was found on a national and European level. These analyses proved the possibility to predict the 87Sr/86Sr ratios in river catchments all over Europe. This relationship allows for an estimation of the applicability of the 87Sr/86Sr ratio for fish ecological questions on a European scale

  19. Assessment of the genotoxic potential along the Danube River by application of the comet assay on haemocytes of freshwater mussels: The Joint Danube Survey 3.

    Science.gov (United States)

    Kolarević, Stoimir; Kračun-Kolarević, Margareta; Kostić, Jovana; Slobodnik, Jaroslav; Liška, Igor; Gačić, Zoran; Paunović, Momir; Knežević-Vukčević, Jelena; Vuković-Gačić, Branka

    2016-01-01

    In this study we assessed the level of genotoxic pollution along the Danube River by measuring the level of DNA damage in the haemocytes of freshwater mussels of Unio sp. (Unio pictorum/Unio tumidus) and Sinanodonta woodiana. The comet assay was used for the assessment of DNA damage. The research was performed on 34 out of 68 sites analysed within the Joint Danube Survey 3 - the world's biggest river research expedition of its kind in 2013. During research, 2285 river kilometres were covered with an average distance of 68 km between the sites. The complex data set on concentrations of various substances present in water, suspended particulate matter and sediment on investigated sites gave the opportunity to identify the groups of xenobiotics which mostly affect the studied biomarker - DNA damage. The highest levels of DNA damage were recorded in the section VI (Panonnian Plain), which is under the impact of untreated wastewater discharges. Both positive and negative influences of the large tributaries on the level of genotoxicity in the Danube River were evident. Significant correlation in response was detected between the studied species of freshwater mussels. The level of DNA damage in mussels correlated with concentrations of compounds from the group of hazardous priority substances (polycyclic aromatic hydrocarbons), persistent organic pollutants (dioxins) and emerging pollutants (Oxazepam, Chloridazon-desphenyl).

  20. Modelling the Danube-influenced North-western Continental Shelf of the Black Sea. II: Ecosystem Response to Changes in Nutrient Delivery by the Danube River after its Damming in 1972

    Science.gov (United States)

    Lancelot, C.; Staneva, J.; van Eeckhout, D.; Beckers, J.-M.; Stanev, E.

    2002-03-01

    The ecological model BIOGEN, describing the carbon, nitrogen, phosphorus and silicon cycling throughout aggregated chemical and biological compartments of the planktonic and benthic marine systems, has been implemented in the north-western Black Sea to assess the response of this coastal ecosystem to eutrophication by the Danube River. The trophic resolution of BIOGEN was chosen to simulate the major ecological changes reported in this coastal area since the 1960s. Particular attention was paid to establishing the link between quantitative and qualitative changes in nutrients, phytoplankton composition and food-web structures. The BIOGEN numerical code structure includes 34 state variables assembled in five interactive modules describing the dynamics of (1) phytoplankton composed of three distinct groups, each with a different trophic fate (diatoms, nanophytoflagellates, non-silicified opportunistic species); (2) meso- and microzooplankton; (3) trophic dead-end gelatinous organisms composed of three distinct groups (the omnivorous Noctiluca and the carnivores Aurelia and the alien Mnemiopsis ), and organic matter degradation and associated nutrient regeneration processes by (4) planktonic and (5) benthic bacteria. The capability of the BIOGEN model to simulate the recent ecosystem changes reported for the Black Sea was demonstrated by running the model for the period 1985-1995. The BIOGEN code was implemented in an aggregated and simplified representation of the north-western Black Sea hydrodynamics. The numerical frame consisted of coupling a 0-D BIOGEN box model subjected to the Danube with a 1-D BIOGEN representing the open-sea boundary conditions. Model results clearly showed that the eutrophication-related problems of the north-western Black Sea were not only driven by the quantity of nutrients discharged by the Danube, but that the balance between them was also important. BIOGEN simulations clearly demonstrated that phosphate, rather than silicate, was the

  1. The Perspective of the Development of the Vinous Tourism in the Ukrainian Danube

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    Margarita Diduh

    2013-08-01

    Full Text Available Viniculture is the traditional branch of the specialization of the agriculture of the Ukrainian Danube. Technology of the production of the wine by different ethnic groups can be traced here. It creates the favorable ground for the development of the vinous tourism in the context of the unique agroclimatic conditions of the territory

  2. Delineating locals: Transformations of knowledge/power and the governance of the Danube delta

    NARCIS (Netherlands)

    Assche, van K.A.M.; Duineveld, M.; Beunen, R.; Teampau, P.

    2011-01-01

    In this paper, we adopt a Foucauldian perspective on power/knowledge interactions to investigate the evolution and implementation of policy for the Romanian Danube delta. We argue that a better understanding of the potential for citizen participation in environmental governance can be obtained from

  3. Balance of Comparative Advantages in the Processed Food Sector of the Danube Countries

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    Svetlana Ignjatijević

    2015-05-01

    Full Text Available In this paper, we investigated the level of competitiveness of the processed food sector of the Danube region countries, in order to show the existence of comparative advantage and the correlation of exports. We used the Balassa (RCA–revealed comparative advantage index and TPI (trade performance indexes. At first, using the Pearson and Spearman index, we examined the existence of correlations between the processed food sector of the Danube countries. Then, we applied the Least Significant Difference (LSD test to further compare the value and answered the question: between which Danube countries are there significant differences? With the study, we found that the distribution of the RCA index in Bosnia and Herzegovina, Hungary, Moldova and Slovenia deviates from normality. We also found the existence of a strong correlation of the RCA index of the Czech Republic with Romania, Hungary with Moldova and Serbia, Moldova with Serbia and Bulgaria with Ukraine. Finally, we concluded that the development of trade in the countries of the Danube region requires the participation of all relevant interest groups and could play an important role in providing faster economic development, that is in achieving sustainable development of the countries, with the sustainable use of available resources.

  4. Recent Data on the Danube Delta (Romania Avifauna from the 2014 and 2015 Summer Seasons

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    Kiss Botond J.

    2016-11-01

    Full Text Available A number of faunistically interesting observations related to the avifauna of the Danube Delta (Romania are presented. In the spring of 2015, a mass mortality event with a minimum of 118 dead birds occurred in a major Dalmatian Pelican Pelecanus crispus colony in the Black Sea lagoons caused by the avian flu virus, strain H5N1. A possible hybrid between Little Egret Egretta garzetta and Western Reef Heron Egretta gularis was observed. The first nesting of Ruddy Shelduck Tadorna ferruginea in the Danube Delta was documented. Goldeneye Bucephala clangula and Smew Mergus albellus are re-colonising the areas they abandoned in the early 20th century. New data regarding the relocation of Pallas’s Gull Larus ichthyaetus colony in the Danube Delta as a result of hydromorphological changes in the bay, nesting and defence strategies against Caspian Gulls Larus cachinnans are described. Probable nesting of Citrine Wagtail Motacilla citreola in the Danube Delta was documented in 2014 for the first time.

  5. The English Language as a Mediator of the Intercultural Dialogue within Danube Space

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    Denitsa Yordanova

    2014-08-01

    Full Text Available The paper explores the importance of the English language in the process of cooperation between the countries in the Danube region and outlines the value of the knowledge for the different cultures and the variety of languages that are spoken in this region. Study of contemporary linguistic and cultural borrowings in Bulgaria, Russia and the USA. Comparative analysis based on survey results. The results of the survey show the peopleřs opinion on the value of the English language as a tool for solving the communication problems stemming from the different languages that are spoken in the Danube region. The results also show how people perceive this region and what issues are considered as important for its development. The results can serve as a starting point of a large-scale study on the linguistic and cultural diversity within the Danube region. This paper interprets the impact of the English language in the process of achieving mutual knowledge about the cultures of the ten countries that are situated along the Danube river.

  6. New record of Neogobius fluviatilis (Pallas, 1814 (Gobiidae in the Danube river basin (Serbia

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    Đikanović Vesna

    2013-01-01

    Full Text Available Recently, the growing colonization of allochthonous organisms in the Serbian section of the Danube River and interconnected ecosystems was observed. Hydro-morphological changes, such as regulations of the watercourse, have made this sector suitable for bio-invasions. Two specimens of Neogobius fluviatilis (Pallas, 1814 (Piscea: Gobidae were collected on 10 August 2012 from the Zapadna Morava River, below the first dam on the river course. This is the first record of the sand goby in the watercourse in the central part of Serbia, as a tributary of the Danube River. Our findings show that the sand goby has thus far reached not only the main course of the Danube River but its tributary as well. This freshwater fish was observed for the first time in the Serbian part of the Danube River in 1986 in Begej locality (1.276 km. There are five Ponto-Caspian goby species in the waters of Serbia. [Projekat Ministarstva nauke Republike Srbije, br. 173045, br. 37009 i br. 31011

  7. Narrating Regional Identity in Tourism--Sketches from the Austrian Danube Valley

    Science.gov (United States)

    Ploner, Josef

    2009-01-01

    This article sketches the processes of regionalisation in the realm of present day tourism. By exploring issues of "regional culture" and "diversity" in Austria, and more particular, in the highly symbolic Danube valley "Wachau", the article shows how the imaginaries of contested cultural spaces--be they…

  8. Importance of the Danube in the Development of the European inland transport. Inland and Port Infrastructure Development in Romania

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    Romeo Boşneagu

    2015-08-01

    Full Text Available Europe currently has an extensive network of inland waterways components of the Pan European Transport Network. The Danube River with Sulina and Danube-Black Sea is part of pan European transport corridor VII. European policy in the transport sector, is subject to joint decisions in the Council of the European Union. A current priority is to balance the use of different types of transportation alternation and making connections between transport modes. Currently it acts to stimulate the development of a balance between rail sectors, maritime, river and waterways of Europe. Romania is implementing several European and national programs to upgrade its infrastructure on the Danube waterway

  9. The Danube Bend, Hungary - proposal for its recognition as a geoheritage

    Science.gov (United States)

    Karátson, Dávid

    2016-04-01

    The Danube Bend in North Hungary is a river curvature along the Danube river, cut into a rocky section that reveals Miocene volcanic sucessions. The deepest and narrowest part of the curvature, 5 km in diameter (called Visegrád Gorge), is one of the most picturesque landscapes in Hungary. There, the Danube, before changing its direction toward the south, forms a U-shaped valley in planform - a peculiar shape that has been an enigmatic issue in Hungarian earth sciences since the 19th century. A number of geomorphological theories have been put forward for the origin of the valley, which is incised between remnants of ca. 16 Ma old, small-sized dacitic stratovolcanoes of the Börzsöny Mts to the north, and the ~15 Ma Keserűs Hill lava dome complex to the south, all of which emerged in a contemporaneous archipelago (existent up to Pannonian times). According to Karátson et al. (2006), the U-shaped loop is partly inherited from a late-stage horseshoe caldera morphology of Keserűs Hill volcano, open to the north. Several Ma later, the formation of the Danube Bend was initiated by river incision, removing the post-volcanic sedimentary cover in mid- or rather, late Pleistocene times. Fluvial processes and erosion in turn were triggered by mountain uplift, climate changes, and drop of remote erosion base level. The present curvature of the river was controlled by the exhumation of the horseshoe caldera as well as the surrounding resistant volcaniclastic rocks (e.g. Visegrád Castle Hill) and a hilltop lava dome (Szent Mihály Hill). Moreover, an early-stage meander of Danube may have also inherited. The accelerated Late Quaternary erosion and intense dissection has resulted in a "re-birth" of the volcanic relief, which exhibits again steep slopes to form the spectacular gorge. At present, exposed rock formations (e.g. Vadálló-kövek) tower above the Danube Bend, making the area one of the most scenic landscape in East-Central Europe. Therefore, in 1997, the Danube

  10. Large-scale water resources management within the framework of GLOWA-Danube. Part A: The groundwater model

    Science.gov (United States)

    Barthel, Roland; Rojanschi, Vlad; Wolf, Jens; Braun, Juergen

    The research project GLOWA-Danube, financed by the German Federal Government, is investigating long-term changes in the water cycle of the upper Danube river basin (77,000 km 2) in light of global climatic change. Its aim is to build a fully integrated decision-support tool “DANUBIA” that combines the competence of 11 different research institutes in domains covering all major aspects governing the water cycle-from the formation of clouds, to groundwater flow patterns, to the behaviour of the water consumer. Both the influence of natural changes in the ecosystem, such as climate change, and changes in human behaviour, such as changes in land use or water consumption, are considered. DANUBIA is comprised of 15 individual disciplinary models that are connected via customized interfaces that facilitate network-based parallel calculations. The strictly object-oriented DANUBIA architecture was developed using the graphical notation tool UML (Unified Modeling Language) and has been implemented in Java code. All models use the same spatial discretisation for the exchange of data (1 × 1 km grid cells) but are using different time steps. The representation of a vast number of relevant physical and social processes that occur at different spatial and temporal scales is a very demanding task. Newly developed up- and downscaling procedures [Rojanschi, V., 2001. Effects of upscaling for a finite-difference flow model. Master’s Thesis, Institut für Wasserbau, Universität Stuttgart, Stuttgart, Germany] and a sophisticated time controller developed by the computer sciences group [Hennicker, R., Barth, M., Kraus, A., Ludwig, M., 2002. DANUBIA: A Web-based modelling and decision support system for integrative global change research in the upper Danube basin. In: GSF (Ed.), GLOWA, German Program on Global Change in the Hydrological Cycle Status Report 2002. GSF, Munich, pp. 35-38; Kraus, A., Ludwig, M., 2003. GLOWA-Danube Papers Technical Release No. 002 (Danubia Framework

  11. Larvas de Chironomidae arvas (Diptera da planície de inundação do alto rio Paraná: distribuição e composição em diferentes ambientes e períodos hidrológicos = Chironomidae larvae (Diptera from the upper Paraná river floodplain: distribution and composition in different environments and hydrological periods

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    Gisele Cristina Rosin

    2007-01-01

    Full Text Available O presente estudo teve por objetivos, identificar possíveis diferenças na estrutura da comunidade de larvas de Chironomidae em quatro ambientes da planície de inundação do alto rio Paraná com diferentes características e analisar a influência dos fatores abióticos e das variações do nível hidrométrico sobre a comunidade. As coletas foram realizadas em março e setembro de 2003. Em cada um dos 12 pontos coletados foram realizadas quatro amostragens: três para análise biológica e uma para análise sedimentológica. O material biológico foi lavado em conjunto de peneiras com malhas de abertura 2, 1 e 0,2 mm e fixado em álcool 70%. As larvas de Chironomidae foram identificadas até a categoria de gênero. Foram encontradas 1478larvas de Chironomidae pertencentes a 19 gêneros. Polypedilum, Tanytarsus e Chironomus foram registrados em todos os ambientes. As maiores densidades e diversidade de Chironomidae foram registradas nos períodos de águas baixas, especialmente em ambientes lênticos. Avariação da densidade, dominância e diversidade de Chironomidae entre as duas coletas foi influenciada, principalmente, pelo ciclo hidrológico e pelo oxigênio dissolvido, enquanto que a variação espacial esteve associada ao tipo de sedimento, porcentagem de matéria orgânica e a presença ou ausência de macrófitas aquáticas.The present study had the aim to identify possible differences in the community structure of Chironomidae larvae in four different environments of the upper Paraná river floodplain with different characteristics and to analyze the influence of abiotic factors and variations in the hydrometric level of the community. Samplings were carried out in March and September, 2003. Four samplings were taken from each of the 12 collecting points: three for biological analysis and one for sediment analysis. Biological contents were washed with the aid of a system with 2.0; 1.0 and 0.2 mm sieves. Chironomidae larvae were

  12. "Possible impacts of climate change on the Danube river along the Iron Gate gorge

    Science.gov (United States)

    Adamovic, M.

    2009-04-01

    The research was dedicated to foreseeing the possible impacts of climate change on water resources in eastern part of Serbia, along the Danube catchment. The Danube basin is in the eastern section of the considered RCM ( Regional climate model). For this purposes, the RCM EBU-POM according to the IPCC scenario A1B, was used in its representation of the hydrological balance over the Danube river basin along Iron Gate gorge, for the time frame 1961-1990 and 2071-2100. The Danube's catchment encompasses continental climate, as it is land-dominated by advection from the surrounding land areas. This part of Danube catchment is greatly affected by the Mediterranean climate, since the Danube runoff gives a relevant contribution of freshwater flux into the Mediterranean sea and it is dependent mostly on precipitated water of Mediterranean origin. On the other, the Dinaric-Balkan mountain chains in the west and the Carpathian mountain bow in the north and east, present distinctive morphological and climatic regions and barriers. The hydrological balance has been computed in two different, but in principle equivalent ways. The first approach, which has a more hydrological nuance, relies on establishing relationships between annual averages of the hydrological balance parameters (E, P, T) in order to get relevant coefficients. The second approach, which is more typically meteorological, relies on the calculation of the E for the time frame 2071-2100 by using the previous coefficients and getting runoff depth (h) and discharge (Q) as the final outputs. The results according to this model, show that the river flow of the Danube, in this part of its basin, will decrease over 50% with a great consequences to the dams Iron Gate I and II, their accumulations and ecosystems. Furthermore, if we take into account predictions made by IPCC which say that the south-east Europe will face temperature growth of 0.2 degrees in the next two decades for the range of SRES scenarios, makes the

  13. TRANSBOUNDARY IMPACT OF THE CHERNAVODSKA NPP ON TRITIUM POLLUTION OF THE DANUBE RIVER ON THE TERRITORY OF UKRAINE

    Directory of Open Access Journals (Sweden)

    V. I. VIT`KO

    2015-10-01

    Full Text Available This article reviews the influence of the Chernavodska nuclear power plant on the aquatic environment of the Danube River in the transboundary context. Data of tritium discharges, dependence of volume activity of tritium in the Danube River, and its inflows from the surrounding areas to its mouth. The average annual volume activities of tritium are provided. Assessments of the impact of the Chernavodska NPP in conditions that are different from the norm have been given.

  14. DATOURWAY: Transnational Strategy for the Sustainable Territorial Development of the Danube Area with Special Regard to Tourism

    OpenAIRE

    Elena Stancu; Amelia Cazacu

    2014-01-01

    The article is a synthesis of the DATOURWAY project which is a part of South Est Europe Program (2009-2012) and represents “an outstanding example of transnational cooperation” between partners from seven countries, from which six countries are touched by the Danube River. The cooperation within the project was committed to the development of tourism along and on the middle and south-eastern section of river Danube, while paying particular attention to the protection and enhancement of the na...

  15. The Danube question during the period of the Vienna peace Conference and Congress of Paris (1855-1856

    Directory of Open Access Journals (Sweden)

    Mihaela Munteanu

    2015-06-01

    Full Text Available After the start of the Crimean War, one of the main objectives of the European diplomacy was the resolving of the contradictions related to the navigation on the Danube. Removing Russia from the Danube's mouth and eliminating the danger of Austria's exclusive control in the Romanian region of the river, represented important victories for Romanians, which, under the collective guarantee of the great European powers, could follow their own political destiny and meanwhile to grow economically.

  16. Extending the area of investigation of fine versus coarse quartz optical ages from the Lower Danube to the Carpathian Basin

    OpenAIRE

    Timar-Gabor, Alida; Daniela CONSTANTIN; Marković, S. B.; Jain, Mayank

    2015-01-01

    Despite the general satisfactory performance of quartz in the single aliquot regeneration protocol (SAR), previous optically stimulated luminescence (OSL) dating studies of key loess sections in Romania, Lower Danube region, revealed a disturbing disagreement among the ages obtained on fine (4e11 mm) grains and coarse (63e90 mm) grains respectively. The current study aims at expanding these investigations, both by extending the area of study from the Lower Danube Basin to the Carpathian Basin...

  17. Newborns health in the Danube Region: environment, biomonitoring, interventions and economic benefits in a large prospective mother-child cohort study

    OpenAIRE

    Andersen, Zorana J; Sram, Radim J.; Ščasný, Milan; Gurzau, Eugen S.; Fucic, Aleksandra; Gribaldo, Laura; Rossner, Pavel, Jr.; Rossnerova, Andrea; Braun Kohlová, Markéta; Máca, Vojtěch; Zvěřinová, Iva; GAJDOSOVA Dagmar; Moshammer, Hanns; Rudnai, Peter; Knudsen, Lisbeth E.

    2015-01-01

    Background: The EU strategy for the Danube Region addresses numerous challenges including environment, health and socioeconomic disparities. Many old environmental burdens and heavily polluted areas in Europe are located in the Danube Region, consisting of 14 countries, with over 100 million people. Estimating the burden of environmental exposures on early-life health is a growing research area in Europe which has major public health implications, but the data from the Danube Region are large...

  18. Seasonal Variation of Eutrophication in Some Lakes of Danube Delta Biosphere Reserve.

    Science.gov (United States)

    Török, Liliana; Török, Zsolt; Carstea, Elfrida M; Savastru, Dan

    2017-01-01

      To understand the trophic state of lakes, this study aims to determine the dynamics of phytoplankton assemblages and the main factors that influence their seasonal variation. Sampling campaigns were carried out in three lakes from the Danube Delta Biosphere Reserve. Spectral analysis of specific phytoplankton pigments was applied as a diagnostic marker to establish the distribution and composition of phytoplankton taxonomic groups. Fluorescence spectroscopy was used to quantify changes in dissolved organic matter (DOM). The relative contribution of the main phytoplankton groups to the total phytoplankton biomass and the trend of development during succession of the seasons showed that cyanobacteria could raise potential ecological or human health problems. Moreover, fluorescence spectroscopy revealed that Cryptophyta and cyanobacteria were the main contributors to the protein-like components of DOM. It was concluded that fluorescence could be used to provide a qualitative evaluation of the eutrophication degree in Danube Delta lakes.

  19. 24th International Conference on Robotics in Alpe-Adria-Danube Region

    CERN Document Server

    2016-01-01

    This volume includes the Proceedings of the 24th International Conference on Robotics in Alpe-Adria-Danube Region, RAAD 2015, which was held in Bucharest, Romania, on May 27-29, 2015. The Conference brought together academic and industry researchers in robotics from the 11 countries affiliated to the Alpe-Adria-Danube space: Austria, Croatia, Czech Republic, Germany, Greece, Hungary, Italy, Romania, Serbia, Slovakia and Slovenia, and their worldwide partners. According to its tradition, RAAD 2015 covered all important areas of research, development and innovation in robotics, including new trends such as: bio-inspired and cognitive robots, visual servoing of robot motion, human-robot interaction, and personal robots for ambient assisted living. The accepted papers have been grouped in nine sessions: Robot integration in industrial applications; Grasping analysis, dexterous grippers and component design; Advanced robot motion control; Robot vision and sensory control; Human-robot interaction and collaboration;...

  20. About the wall which was the river. Mihály Kornis The Jewish Danube

    Directory of Open Access Journals (Sweden)

    Kinga Piotrowiak-Junkiert

    2015-12-01

    Full Text Available In the first part of the article, the author presents a few crucial political and historical events which have an association with the situation of the in 1944-45 Budapest. The politics of the Arrow Cross Party, very similar to German Nazis, led to the mass execution of Jewish citizens on the Danube river. The main purpose of the article is to analyse a short story by the Hungarian writer Mihály Kornis. In The Jewish Danube he raises the thorny issue of the memory of the murdered people, and in doing so creates a blasphemous and provocative text, in which he tries to break the taboo subject of genocide.

  1. “Porţile de Fier/Iron Gates” Gorges Area (Danube Fish Fauna

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    Bănăduc Doru

    2014-12-01

    Full Text Available An important fisheries sector of the Danube, the “Iron Gates” area, was studied by famous naturalists along the history like Marsigli, Haeckel, Kner, Antipa and Bănărescu. After more than half a century after the last main publication in this area, the “Iron Gates” Danube sector suffered significant human impact, and an assessment of the fish fauna was needed. The paper summarizes the trend of fish species along the XIX to XXIst centuries, and reveals the appearance of new species. The study includes data from about 65 fish species, belonging to: Acipenseridae, Polyodontidae, Clupeidae, Salmonidae, Esocidae, Cyprinidae, Cobitidae, Siluridae, Ictaluridae, Anguillidae, Lotidae, Gasterosteidae, Syngnathidae, Centrarchidae, Percidae, Gobiidae, Odontobutidae, and Cottidae. The major hidrotechnical works along with pollution, overexploitation and poachery, induced major changes in the ichthyofauna structure.

  2. Comparative Study Of Alluvial Cnidion-Type Meadows In The Lower Danube River Basin

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    Schneider-Binder Erika

    2014-10-01

    Full Text Available Alluvial Cnidion-type meadows (Habitat type 6440 of the Habitats Directive, mostly characteristic for the lower courses of large rivers in continental climate conditions of Europe are presented from the Lower Danube upstream the municipality of Giurgiu (river-km 510-524. The ecological requirements of the characteristic species, as well as their sensitivity to human-induced changes that derive from regular flooding, drainage, intensification of use and/or abandonment, are highlighted; these changes frequently lead to a decrease of biodiversity of the Cnidion-type meadows or to their total loss The studied meadows are compared with similar alluvial meadows from other sites of the lower Danube River basin. Finally, the strong interlocking of Cnidion type meadows with those of the Agropyro-Rumicion, Molinion and Deschampsion caespitosae alliances are discussed.

  3. The River Danube as an Attraction in Positioning Hotels along its Riverside Capitals

    Directory of Open Access Journals (Sweden)

    Ákos Kátay

    2015-04-01

    Full Text Available The hotel is part of the tourism suprastructure; it provides the conditions of the complex supply set of the people’s temporary home. The most important supply characteristic is the location, because this is the only one that is not changeable after a hotel starts its operation. Therefore, the site of the venue completely determines the hotel’s future successfulness. The aim of the research is to explore how much Danube bank located hotel industry lived with the opportunity of choosing the venue’s establishing location as a potential attraction. The paper also outlines how much these properties use this condition in their marketing and also in selling their products. The research examines those hotels that have no significant built-up area between their property and the Danube that would completely destroy the view of the river. According to the hypotheses of the research these riverside based venues mostly belong to international or regional hotel chains. The economical factor during the planning of the venue is much more important than that all rooms should have a riverside view. In the hotels’ marketing communication the utilization of the Danube appears as an attraction such as its additional value shows up in their price policy. The average room prices of these venues’ are higher than the same capital’s similar star-rated ones without having Danube view. In order to get relevant answers for the above hypotheses authors have a detailed literature review on the development plans and operating reports of the hotel and hospitality industry and examined the involved hotels’ website content analysis, as well.

  4. Tourist ships on the Danube as an opportunity for export of meat and meat products

    Directory of Open Access Journals (Sweden)

    Tešanović Dragan

    2015-01-01

    Full Text Available Tourism development launches growth of other complementary industries. River tourism, as a special selective tourism form, experiences intensive development, with an importance for all the regions through which the Danube, as an integral part of the Rhine - Main - Danube waterway, flows. During cruising, the largest consumption is achieved on the ship itself, where meat and meat products are an integral element of every meal and represent the most expensive component of the dish. The task of this paper is to analyse the consumption of meat and meat products on six tourist ships run by to 'Grand Circle Corporation' in 2013, in order to point out the possibility of supplying them with meat and meat products from sources in the territory where the ships sail. The paper presents the current suppliers and manufacturers of meat and meat products in Republic of Serbia that could supply the company 'Grand Circle Cruise Line' and other tourist ships that cruise on the Danube. Also, the research indicates that the export of meat products from the Republic Serbia could have a significant effect on improving the agricultural conditions and food production through increased competition, assuming the Serbian manufacturers supply most of tourist ships and not only the six ships analysed in this paper. Research results, specifically, point out the possibility of increasing export of poultry and beef if the potential demand of each of the eight companies with their 54 ships which operate tourist cruises on the Danube is taken into account. The data have been systematized, analysed and presented statistically in tables and graphs.

  5. Actual contamination of the Danube and Sava Rivers at Belgrade (2013)

    OpenAIRE

    Antonijević Milan D.; Arsović Marija; Čáslavský Josef; Cvetković Vesna; Dabić Predrag; Franko Mladen; Ilić Gordana; Ivanović Milena; Ivanović Nevena; Kosovac Milica; Medić Dragana; Najdanović Slobodan; Nikolić Milica; Novaković Jovana; Radovanović Tatjana

    2014-01-01

    This study is focussed on a comprehensive investigation on the state of pollution of Danube and Sava rivers in Belgrade region. Different complementary analytical approaches have been used covering both (i) organic ccontaminants in river water by target analyses of hormones and neonicotinoids as well as non-target screening analyses and (ii) heavy metals in sediments. Finally, some common water quality parameters have been analysed. The overall state of pol...

  6. NATURAL AND ARTIFICIAL RADIOACTIVITY IN BULGARIAN SOILS ALONG THE DANUBE RIVER

    OpenAIRE

    I YORDANOVA; STANEVA, D.; TZ BINEVA

    2005-01-01

    Data from gamma-spectrometry analyses of soils and sediments samples taken along the Danube river is presented in the paper. Results about the content of natural and artifi cial radionuclides like Sr-90 and Cs-137 are discussed. The region around the Kozloduj NPP including its exclusion zone is investigated in more details. Data from the last years is compared with such from former investigations of similar samples from the region. The soil is a natural depot and initial reservoir for spreadi...

  7. Trace Element Accumulation in Selected Bioindicators Exposed to Emissions along the Industrial Facilities of Danube Lowland

    OpenAIRE

    SPIEGEL, Heide

    2002-01-01

    The scope of this study was to investigate the effects of the atmospheric emissions of two significant industrial centres of the Danube Lowland: the Schwechat and Slovnaft refineries. In this connection the environmental pollution of emission zones by heavy metals on the base of selected bioindicators (soil, lucerne, wheat, earthworms) should be evaluated. The phenomenon of the atmospheric impact of heavy metal aerosols on the food chain and substance transfer for the model studied (...

  8. The Role of the Nobles-Philanthropists in the Activities of Hospitals in the Danube Region

    Directory of Open Access Journals (Sweden)

    Nataliya Goncharova

    2015-08-01

    Full Text Available Reviews the legal and regulatory basis in the sphere of the guardianship treatment centres in the Russian Empire in the middle of the XIXth century, alleging the establishment of the public supervision over the activities of city, County and provincial hospitals. Contents of the powers of the Trustees, their objectives and main activities. Specific examples in the Danube region proved the thesis that among the Trustees were dominated by representatives of the nobility.

  9. Wet Spells and Associated Moisture Sources Anomalies across Danube River Basin

    Directory of Open Access Journals (Sweden)

    Danica Ciric

    2017-08-01

    Full Text Available The Danube River Basin is the second longest catchment basin in Europe and exhibits intense climatological diversity. In recent decades, the frequency and intensity of daily precipitation extremes have suffered from an increment in many parts of the world, including Central and Eastern Europe. Wet spells are defined by the number of consecutive rainy days with different thresholds. The identification of wet spells and their trends in the rainfall time is very important for many sectors, such as agriculture, ecology, hydrology and water resources. Wet spells can lead to extreme events and cause floods and other disasters. In this study, we will attempt to characterise global precipitation in the context of wet spells and associated precipitation depth of wet spells in the Danube River Basin area using daily precipitation data, as well as analysing different approaches to identifying wet spells. The ten most intense wet spells were detected, and the most intense, which occurred on 23 September 1996, was studied in depth in terms of precipitation and associated anomalies, the synoptic situation and the anomalous transport of moisture using a Lagrangian approach. The existence of a marked west-east dipole in the field of sea level pressure between the Atlantic Ocean and the eastern Mediterranean leads to the anomalous moisture transport from the Northern Atlantic Ocean to the Mediterranean Sea, where a higher available amount of moisture existed, and subsequently penetrated within the low positioned over the Danube River Basin. In addition, an Atmospheric River was also responsible for the wet conditions in the Danube River Basin. The combination of all these factors was responsible for the extreme precipitation linked with the wet spell.

  10. Environmental Security in the Danube River Basin: Policy Implications for the United States

    Science.gov (United States)

    1999-01-01

    lead to instability, consti- tute what has been termed the “environmental security pillar ” of preventive defense (Goodman, 1996). The Department and...Wetlands (b) Metals cadmium, mercury, copper , nickel, lead, zinc, chromium, arsenic (c) Danube related (d) Data too scarce to allow for proper...chlorine producing industry; zinc from electroplating and the pulp industries; chromium from waste treatment discharges fiom tanning, electroplating

  11. Análise das modificações da cobertura vegetal da planície fluvial do alto rio Paraná no período entre 1976 e 2007 = Analysis of vegetation changes in the Paraná river floodplain between 1976 and 2007

    Directory of Open Access Journals (Sweden)

    Edivando Vitor Couto

    2011-04-01

    Full Text Available A vegetação da planície fluvial do rio Paraná sofre a pressão da ocupação antrópica desde a década de 1950. A área próxima a Porto Rico (Paraná tem sido estudada desde os anos 1980, mas não há estudos dirigidos à distribuição espacial da vegetação. Os objetivos deste trabalho são cartografar as unidades vegetais e verificar a evolução temporal de sua distribuição entre 1976 e 2007. Para isso foram utilizadas imagens orbitais de 1976 (LANDSAT MSS-1, 1987 (LANDSAT TM-5, 2000 (LANDSAT ETM+7 e de 2007 (CBERS-2 CCD. Asimagens foram georreferenciadas e classificadas pelo algoritmo Bhattacharya. Foram identificadas três classes de vegetação, corpos de água e áreas de solo exposto. A análise multitemporal demonstrou aumento contínuo da área de solo exposto, aumento da área dos corpos de água, mudança de posição das áreas úmidas no período entre 1976 e 1987 e modificações mais sutis de ambas as classes no período entre 1987 e 2007. As áreas de vegetação arbórea diminuíram em quase todos os anos. Tais dados permitem afirmar que a atuação antrópica sobre a planície vem se ampliando e que as principais cheias modificaram sua morfologia.The removal of vegetation from the Paraná river floodplain has been increasing since the 1950s the until present time, but no study has been made about its spatial distribution. The purpose of this paper is to map and analyze the temporal evolution of vegetation distribution over the Parana river floodplain between 1976 and 2007. Orbital images from 1976 (LANDSAT MSS-1, 1987 (LANDSAT TM-5, 2000 (LANDSAT ETM+7 and 2007 (CBERS-2 CCD were utilized to compare the evolution of the vegetation distribution over that time period. Theimages were georeferenced using SPRING 4.3.3 software and classified by the Bhattacharya algorithm; the maps were produced using the Global Mapper 7.4 software. Three different classes of vegetation, water bodies and exposed soil areas were

  12. Community Role in Heritage Management and Sustainable Turism Development: Case Study of the Danube Regionin Serbia

    Directory of Open Access Journals (Sweden)

    Aleksandra TERZIĆ

    2014-12-01

    Full Text Available Destinations and cultural resources that are used and respected by both residents and tour-ists are the ultimate goal of sustainable tourism development. The sustainable tourism as an emerging paradigm seems to enhance the exist-ing conceptual frameworks on tourism planning and development by making the residents its focal point. In that sense, opinions and attitudes of residents on the protection of cultural heritage and the possibilities of tourism development in their environment are very important. The Dan-ube region in Serbia is recognized as a region of high quality natural characteristics and cultural resources which gives an outstanding opportuni-ty for tourism development. The purpose of the study is to examine the current state of the heri-tage management in the Danube region in Serbia and to outline the tourism development potentials of the area. The objective of the study is to ex-amine the role of the local communities in these aspects.  The methods used in the study were a public opinion survey, a focus group interview of 12 experts and the evaluation of the sustainable cultural tourism development indicators. The results have shown that local population in the Danube region in Serbia has, in general, a posi-tive opinion and initial enthusiasm when it comes to tourism development, but their role is margin-alized in the process. This is the key proposition to start an initiative for the local communities to actively participate in tourism development.

  13. Peculiarities of the Danube Business Environment in the Context of the Sustainable Development

    Directory of Open Access Journals (Sweden)

    Viorica Pușcaciu

    2015-08-01

    Full Text Available The aim of our study intends to be a link between the “green economy” and the “blue economy”, and the objective of it is to analyze the Danube economy in the context of the environment preserving. As the prior works deserve generous space to research regarding the sustainable development concept and experiences and others deal with the Danube problems, our approach tries to build on a link between these two fields of research, and understanding all these problems linked to the Romanian area and trying to find out what are the problems in this sense for our country. The method of research used for our survey is a qualitative one, survey and observation being our tools for fulfillment this approach. The key results and conclusions from this empirical study is that any reader of it could find out how the Danube business environment tries to circumscribe it into the sustainable development percepts. This study could be useful to researchers, administrations, ports authorities, and people interested in this field. The key contribution of this paper might be the interdisciplinary approach of this matter and thus the hope of its originality.

  14. NATURAL AND ARTIFICIAL RADIOACTIVITY IN BULGARIAN SOILS ALONG THE DANUBE RIVER

    Directory of Open Access Journals (Sweden)

    I YORDANOVA

    2005-07-01

    Full Text Available Data from gamma-spectrometry analyses of soils and sediments samples taken along the Danube river is presented in the paper. Results about the content of natural and artifi cial radionuclides like Sr-90 and Cs-137 are discussed. The region around the Kozloduj NPP including its exclusion zone is investigated in more details. Data from the last years is compared with such from former investigations of similar samples from the region. The soil is a natural depot and initial reservoir for spreading of all man-made radionuclides and natural radioactivity. The man-made isotopes with the longest half-life time, like Sr-90 and Cs-137 are mainly investigated. Because of their feature to be bioelements, that is to include themselves in human’s metabolism, they are especially dangerous when their concentrations in the nutritious chain increase. That is why the investigation of these nuclides together with the natural once like uranium, thorium and radium started in 1978 with annual determination of their concentrations in soils collected from the region of “Kozloduj” NPP and some places along the Danube river potentially exposed to radioactive contamination. The aim was to make a picture of the radioecological status of the soils along the Danube river. The period after 1986 is concerned as the accident in Chernobyl’s NPP changed basically the radioactive situation in the country.

  15. The Ways to Optimize the History Education in Ukrainian Danube Region

    Directory of Open Access Journals (Sweden)

    Liliya Tsyganenko

    2014-08-01

    Full Text Available The history education in the Danube region has a long tradition. In 1940 Akkerman Teachersř Institute (later - Izmail State Pedagogical Institute opened the Faculty of History, which lasted until 1950. Revival of the history education in the region occurred in 1991, when at the college, within the Faculty of Ukrainian Philology was resumed training of the historical profile. As an independent faculty of the University the Department of History existed from 2001 to 2011. Demographic problems, poor funding, remoteness from major research centers, the lack of historical perspective of the scientific projects call into question the ability to save in Izmail University the training center for historians of the region. Today there is an urgent need to optimize the approaches and principles of the organization of history education in the Danube region, which should be based on the application of scientific research in the educational process, expanding European integration approaches, joint historical research, frank discussion on relevant and topical issues of the past Bessarabia. As well as the creation by the scientists of Ukraine, Romania, Bulgaria, Moldova joint history textbooks of the Danube region.

  16. SENTINEL-1/2 Data for Ship Traffic Monitoring on the Danube River

    Science.gov (United States)

    Negula, I. Dana; Poenaru, V. D.; Olteanu, V. G.; Badea, A.

    2016-06-01

    After a long period of drought, the water level of the Danube River has significantly dropped especially on the Romanian sector, in July-August 2015. Danube reached the lowest water level recorded in the last 12 years, causing the blockage of the ships in the sector located close to Zimnicea Harbour. The rising sand banks in the navigable channel congested the commercial traffic for a few days with more than 100 ships involved. The monitoring of the decreasing water level and the traffic jam was performed based on Sentinel-1 and Sentinel-2 free data provided by the European Space Agency and the European Commission within the Copernicus Programme. Specific processing methods (calibration, speckle filtering, geocoding, change detection, image classification, principal component analysis, etc.) were applied in order to generate useful products that the responsible authorities could benefit from. The Sentinel data yielded good results for water mask extraction and ships detection. The analysis continued after the closure of the crisis situation when the water reached the nominal level again. The results indicate that Sentinel data can be successfully used for ship traffic monitoring, building the foundation of future endeavours for a durable monitoring of the Danube River.

  17. The Role of Cultural Diplomacy for Intensifying the Cross Border Cooperation within Danube Region

    Directory of Open Access Journals (Sweden)

    Krasimir Koev

    2013-08-01

    Full Text Available Objectives: The main objective of the paper is to highlight the role of cultural diplomacy for strengthening the international cooperation within the Danube macro-region. Prior Work: Some leading points of view in the field of cultural diplomacy serve as a theoretical background of the paper. In order to prove the theses of the research, existing empirical results are discussed and analyzed. Approach: The research uses interdisciplinary approach to conceptualization of cultural diplomacy and applies the methods of observation and systematic analysis and synthesis. Results: The presented empirical data indicate that some measures and actions are needed in the Danube macro-region in order to enhance the culture-based awareness of its citizens and intensify the intercultural cooperation. The establishment of a University Centre for Cultural Diplomacy in the Danube Region (UCDR is presented as a possible tool for the achievement of this goal. Implications: The results of the study can be interesting for public authorities and academics. Value: the promotion of the idea for UCDR is the first of its kind.

  18. SENTINEL-1/2 DATA FOR SHIP TRAFFIC MONITORING ON THE DANUBE RIVER

    Directory of Open Access Journals (Sweden)

    I. Dana Negula

    2016-06-01

    Full Text Available After a long period of drought, the water level of the Danube River has significantly dropped especially on the Romanian sector, in July-August 2015. Danube reached the lowest water level recorded in the last 12 years, causing the blockage of the ships in the sector located close to Zimnicea Harbour. The rising sand banks in the navigable channel congested the commercial traffic for a few days with more than 100 ships involved. The monitoring of the decreasing water level and the traffic jam was performed based on Sentinel-1 and Sentinel-2 free data provided by the European Space Agency and the European Commission within the Copernicus Programme. Specific processing methods (calibration, speckle filtering, geocoding, change detection, image classification, principal component analysis, etc. were applied in order to generate useful products that the responsible authorities could benefit from. The Sentinel data yielded good results for water mask extraction and ships detection. The analysis continued after the closure of the crisis situation when the water reached the nominal level again. The results indicate that Sentinel data can be successfully used for ship traffic monitoring, building the foundation of future endeavours for a durable monitoring of the Danube River.

  19. Two steps back, one step forward: reconstructing the dynamic Danube riverscape under human influence in Vienna.

    Science.gov (United States)

    Hohensinner, Severin; Sonnlechner, Christoph; Schmid, Martin; Winiwarter, Verena

    As part of an interdisciplinary project on the environmental history of the Viennese Danube, the past river landscape was reconstructed. This article describes the different types of historical sources used for the GIS-based reconstruction, the underlying methodological approach and its limitations regarding reliability and information value. The reconstruction was based on three cornerstones: (1) the available historical sources; (2) knowledge about morphological processes typical for the Austrian Danube prior to regulation; and (3) the interpretation of past hydraulic measures with respect to their effectiveness and their impact on the river's behaviour. We compiled ten historical states of the riverscape step-by-step going backwards in time to the early 16th century. After one historical situation had been completed, we evaluated its relevance for the temporally younger situations and whether corrections would have to be made. Such a regressive-iterative approach allows for permanent critical revision of the reconstructed time segments already processed. The resulting maps of the Danube floodplain from 1529 to 2010 provide a solid basis for interpreting the environmental conditions for Vienna's urban development. They also help to localise certain riverine and urban landmarks (such as river arms or bridges) relevant for the history of Vienna. We conclude that the diversity of approaches and findings of the historical and natural sciences (river morphology, hydrology) provide key synergies.

  20. Retrieval of suspended particulate matter concentrations in the Danube River from Landsat ETM data.

    Science.gov (United States)

    Onderka, Milan; Pekárová, Pavla

    2008-07-01

    Alternations in river channel morphology result in a disturbed natural transport of suspended particulate matter (SPM). Suspended particulate matter serves as a transport medium for various pollutants, e.g. heavy metals. It is therefore important to understand how artificial obstructions alter the natural transport of suspended matter. Measurements of SPM in rivers are traditionally carried out during in situ sampling campaigns, which can provide only a limited view of the actual spatial distribution of suspended matter over large distances. Several authors have studied how space-borne remote sensing could be used for mapping of water quality in standing waters, but with only little attention paid to rivers. This paper describes the methodology how a Landsat ETM image was used to map the spatial patterns of SPM in the Slovak portion of the Danube River. Results of our investigation reveal that the Danube River in Slovakia exhibits gradual longitudinal decrease in concentrations of SPM. Based on a strong relationship between the Landsat near-infrared band (TM4) and field measurements, we developed a map of suspended particulate matter in the Danube River with a standard error (SE) of 2.92 mg/L. This study aims to show how archived satellite data and historical water quality data can be used for monitoring of SPM in large rivers. A methodology describing the minimum samples required for sufficiently accurate results is discussed in this paper also.

  1. "An assessment of changes the Danube river flow along the Iron Gate gorge for XXI century

    Science.gov (United States)

    Adamovic, M.

    2009-04-01

    The research was dedicated to foreseeing the possible impacts of climate change on water resources in eastern part of Serbia, along the Danube catchment. The Danube basin is in the eastern section of the considered RCM ( Regional climate model). For this purposes, the RCM EBU-POM according to the IPCC scenario A1B, was used in its representation of the hydrological balance over the Danube river basin along Iron Gate gorge, for the time frame 1961-1990 and 2071-2100. The Danube's catchment encompasses continental climate, as it is land-dominated by advection from the surrounding land areas. This part of Danube catchment is greatly affected by the Mediterranean climate, since the Danube runoff gives a relevant contribution of freshwater flux into the Mediterranean sea and it is dependent mostly on precipitated water of Mediterranean origin. On the other, the Dinaric-Balkan mountain chains in the west and the Carpathian mountain bow in the north and east, present distinctive morphological and climatic regions and barriers. Prior to the assessment of changes of water resources of the Danube river, including the climate change effects, there was determined the terrain's spatial regionalization. Having been aware of the climatic-hydrologic and hydrographic homogeneity of regions, the whole territory of Serbia was divided into 20 units basins. The part of Danube basin in its eastern part, was subject of the research. For this balance unit, the main components of the balance equation of the water that included into the calculation are: precipitation P (mm), flow Q (m3/s), runoff depth h (mm), evaporation E (mm) and annual air temperature T (0C). The hydrological balance has been computed in two different, but in principle equivalent ways. The first approach, which has a more hydrological nuance, relies on establishing relationships between annual averages of the hydrological balance parameters (E, P, T) for the time frame 1961-1990 in order to get relevant coefficients

  2. Education and Training Needs in the Field of Local Development in the Lower Danube Macro Region

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    Laurenţiu Tăchiciu

    2010-11-01

    Full Text Available The present paper is the result of an effort made by the authors to explore the needs of education and training in the field of local development, according to the situation in Romanian and Bulgarian Danube bordering regions, aiming at designing joint projects to address such needs between the universities to which authors are affiliated. Local development is here understood as a deliberately induced process of improving the welfare of local communities, which should be democratic, inclusive and sustainable, in particular with regard to creating competitive local economies, stimulating economic growth and ensuring better living conditions for the inhabitants. Local development is an important part of a governance process which involves complex interactions at various territorially defined levels: local, regional, national, cross-national, international. In the case of the regions considered in the present paper a historical opportunity is provided for them by the so called European Union Strategy for the Danube Region. In order to fully exploit this opportunity, the capacity to address local development issues should be strengthened in both countries, especially by well designed education and training programmes. This is why local development was considered a priority topic for the cooperation between the two universities. In the same framework, taking into consideration the challenges which are specific to the Lower Danube Region, other topics of interest were considered: logistics, tourism, consumer affairs or rural development. The authors of the present paper had to avoid overlapping with the work of the other teams. In particular, there are many common points between local development and rural development, because in both countries the regions on the border of Danube are predominately rural and significantly dependent on agriculture. Therefore, here, the needs for education and training are defined in strict correlation with the required

  3. The Tito-Stalin Conflict and its Political Consequences over the International Regime of the Danube River

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    Arthur Tuluş

    2015-07-01

    Full Text Available The discrepancies arisen between the two totalitarian communist leaders - – Joseph Vissarionovici Stalin (The Soviet Union and Josip Broz Tito (Yugoslavia – contained in themselves the seed of destruction of the political and economic Stalinist monopoly regarding the Danube. Our study proposes to identify, through scientific analysis of contemporary sources of the event, the aftermath of this conflict regarding the political evolution of the international regime of the Danube, as well as the manner in which the dissolution of the communist bloc affected the post-war international relations. Between 1948 and 1953, until the death of Stalin, the conflict blocked the Danube for both communist states from the river's basin as well as in terms of international trade that characterized the previous period (interwar. Stalin viewed the Danube River as a factor of influence and political pressure that meant to subordinate the small communist states. After Stalin's death (March 1953, Khrushchev had to make a series of major concessions regarding Yugoslavia and other communist states which led to the transformation of the international regime of the Danube and to a "thaw" between East and West.

  4. Romania’s Participation to the Conclusion of the Convention on the Final Status of the Danube

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    Constantin Tănase

    2012-08-01

    Full Text Available This paper aims at highlighting Romania's efforts to preserve the natural and historicalrights in connection with the Danube. Throughout its activity there are revealed interwar Romaniandiplomacy efforts for Romania to be a factor in the regulation of maritime and river navigation on theDanube, the potential economic impact and solving the disputes that may arise in this area. Theresearch prior 1989, with significant results has been abandoned over the past two decades, which is arisk to security and economic interests of Romania. The way Romanian delegation acted to the ParisConference of 1920-1921 can be a model for nowadays diplomacy. The problem was investigated, ofcourse, based on archival documents and available papers. We believe that the results can belandmarks or reference points for further research on interests in the Danube basin.

  5. The Jaramillo Bottleneck for Migration of Hominins with Megaherbivores Into Europe via the Danube-Po Gateway

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    Muttoni, G.; Kent, D. V.; Scardia, G.

    2015-12-01

    Based on ongoing magnetostratigraphic work and updated critical reviews of sites bearing hominin remains and/or tools from greater Europe, including the Balkans and Greece, we maintain that the only compelling evidence of hominin presence in these regions was after the Jaramillo subchron (0.99 Ma), at about the time of the climatic late Early Pleistocene revolution (EPR) and the onset of enhanced glacial/interglacial activity from MIS 22 onward. Europe may have become initially populated during the EPR when, possibly for the first time in the Pleistocene, vast and exploitable ecosystems were generated along the Danube-Po Gateway in the Balkan peninsula and northern Italy. These newly formed settings, characterized by low-lands with open grasslands and reduced woody cover during glacial/interglacial transitions, represented the closest analogues to the savanna environment to which several large mammals linked with hominins in a common food web were adapted and could use as a migratory corridor. We acknowledge that lack of evidence may not be a compelling argument, but the absence of the Jaramillo and out-of-sequence cosmogenic nuclide dates with wide error margins in key sections preclude the use of such evidence to substantiate the presence of humans (and presumably associated biostratigraphic markers) prior to the Jaramillo, and thus logically deny applying such conclusions to other systems.

  6. Impact of reduced anthropogenic emissions and century flood on the phosphorus stock, concentrations and loads in the Upper Danube

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    Zoboli, Ottavia; Viglione, Alberto; Rechberger, Helmut; Zessner, Matthias

    2015-01-01

    Patterns of changes in the concentration of total and soluble reactive phosphorus (TP, SRP) and suspended sediments at different flow levels from 1991 to 2013 in the Austrian Danube are statistically analyzed and related to point and diffuse emissions, as well as to extreme hydrological events. Annual loads are calculated with three methods and their development in time is examined taking into consideration total emissions and hydrological conditions. The reduction of point discharges achieved during the 1990s was well translated into decreasing TP and SRP baseflow concentrations during the same period, but it did not induce any change in the concentrations at higher flow levels nor in the annual transport of TP loads. A sharp and long-lasting decline in TP concentration, affecting all flow levels, took place after a major flood in 2002. It was still visible during another major flood in 2013, which recorded lower TP concentrations than its predecessor. Such decline could not be linked to changes in point or diffuse emissions. This suggests that, as a result of the flood, the river system experienced a significant depletion of its in-stream phosphorus stock and a reduced mobilization of TP rich sediments afterwards. This hypothesis is corroborated by the decoupling of peak phosphorus loads from peak maximum discharges after 2002. These results are highly relevant for the design of monitoring schemes and for the correct interpretation of water quality data in terms of assessing the performance of environmental management measures. PMID:25747371

  7. Assessment of the contamination of riparian soil and vegetation by trace metals--A Danube River case study.

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    Pavlović, P; Mitrović, M; Đorđević, D; Sakan, S; Slobodnik, J; Liška, I; Csanyi, B; Jarić, S; Kostić, O; Pavlović, D; Marinković, N; Tubić, B; Paunović, M

    2016-01-01

    The aim of this study was to assess the spatial distribution of arsenic and heavy metals (Cd, Cr, Cu Hg, Ni, Pb and Zn) in a riparian area influenced by periodical flooding along a considerable stretch of the Danube River. This screening was undertaken on soil and plant samples collected from 43 sites along 2386 km of the river, collected during the international Joint Danube Survey 3 expedition (ICPDR, 2015). In addition, data on the concentration of these elements in river sediment was used in order to describe the relationship between sediment, riparian soil and riparian plants. A significant positive correlation (Spearman r, for psoil (r=0.817). A significant correlation between soil and plants (r=0.438) and sediment and plants (r=0.412) was also found for trace metal concentrations. Elevated levels of Cd, Cr, Cu, and Ni were found at certain sites along the Serbian stretch, while elevated concentrations of Hg were also detected in Hungary, of Pb along the Romanian stretch and of As along the Bulgarian stretch (the Lower Danube). These results point to the presence of naturally-occurring metals derived from ore deposits in the Danube River Basin and anthropogenic metals, released by mining and processing of metal ores and other industrial facilities, which are responsible for the entry of metals such as Cu, Ni and Zn. Our results also indicated toxic Cd and Zn levels in plant samples, measured at the Hercegsznato site (Middle Danube, Hungary), which highlighted these elements as a potential limiting factor for riparian vegetation in that area. The distribution of the analysed elements in plant material also indicates the species-specific accumulation of trace metals. Based on our results, the Lower and Middle Danube were found to be more polluted in terms of the analysed elements.

  8. The Danube – Mythical Space in the Literary Text (Voiculescu V. and Meniuc G.

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    Victoria Fonari

    2014-08-01

    Full Text Available From the perspective of the space the myth of the water is the specific one, which, trough its fluidity comes close to the myth of the air and also, through the dynamic force draws close to the myth of the fire, opposed to the earth which is the sign of stability. Studying the myth, we will approach to the image of Danube in the literary texts of Vasile Voiculescu and of George Meniuc. Both authors are tempted to absorb the own experiences through the phantasmagorical images, where the reality blends skillfully with the imagination, water having the function to cross the being into another world which is so little known. For V. Voiculescu, the water can be placed neither in the past, nor in the future, it lives in the circle time. It holds the secret of destiny. Even if it seems predictable, it contains the mysteries that can not be definitively perceived. For V. Voiculesc the river lends the poem which links the man to the aquatic life. Thus the fisherman, Amin, is convinced that he comes from the sturgeon, just like the old Santiago, the character from the novel of Ernest Hemingway, who is united with the porpoises and the flying fish. G. Meniuc is the artist who kept artistically silent in the fiftyřs in MSSR, being suspected during his life of the beginning of his literary career in the interwar period. That is why, Danube represents the space of the knowledge, of a freedom that combines the contemplation, the decoding and the memory. By the Danube (Reni and Tulcea G. Meniuc reveals the Romanian ethnic space.

  9. The Alpine tectonic evolution of the Danube Basin and its northern periphery (southwestern Slovakia

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    Hók Jozef

    2016-10-01

    Full Text Available The tectonic evolution of the pre-Cenozoic basement, as well as the Cenozoic structures within the Danube Basin (DB and its northern periphery are presented. The lowermost portion of the pre-Cenozoic basement is formed by the Tatricum Unit which was tectonically affected by the subduction of the Vahicum / Penninicum distal continental crust during the Turonian. Tectonically disintegrated Tatricum overlaid the post-Turonian to Lower Eocene sediments that are considered a part of the Vahicum wedge-top basin. These sediments are overthrust with the Fatricum and Hronicum cover nappes. The Danube Basin Transversal Fault (DBTF oriented along a NW–SE course divided the pre-Neogene basement of the DB into two parts. The southwestern part of the DB pre-Neogene basement is eroded to the crystalline complexes while the Palaeogene and Mesozoic sediments are overlaid by the Neogene deposits on the northeastern side of the DBTF. The DBTF was activated as a dextral fault during the Late Oligocene – Earliest Miocene. During the Early Miocene (Karpatian – Early Badenian it was active as a normal fault. In the Middle – Late Miocene the dominant tectonic regime with NW – SE oriented extension led to the disintegration of the elevated pre-Neogene basement under the simple and pure shear mechanisms into several NE – SW oriented horst and graben structures with successive subsidence generally from west to east. The extensional tectonics with the perpendicular NE – SW orientation of the Shmin persists in the Danube Basin from the ?Middle Pleistocene to the present.

  10. CAPITALISATION OF NATURAL RESOURCES FOR TOURISM PURPOSES IN THE DANUBE DELTA

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    IOAN ILDIKO

    2015-06-01

    Full Text Available The Danube Delta outstands by a number of characteristics that outline its uniquiness at national, regional and world level, pattern that is recognized by its multiple natural reserve status (biosphere reserve, Ramsar site, UNESCO natural heritage site, Natura 2000 site. Despite major technical works that were prior performed for the development of transportation, agriculture, and mining in the Danube Delta, the territory still preserves untamed ecosystems that create breath-taking landscapes and allow a powerful transformative experience of wilderness with major sustainability education potential for its visitors. Meanwhile, traditional economic activities are declining and local communities are experiencing mainly the drawbacks of remoteness instead of harnessing the valuable opportunities born within the current economic trends that emphasize the need to capture the positive externalities of well-preserved natural ecosystems. The Danube Delta is already a well-known tourism destination, but this status still fails to improve local wellbeing. Thus the richness of natural resources is conflicting with the wellbeing of communities with most of the people living at the edge of poverty. This “resource curse” like situation is the main reason that motivates our study that envisages outlining how tourism development and management could create the economic capacity that delivers prosperity for local communities without jeopardising the conservation goals of the natural reserve. In this respect we revisited a number of characteristics of tourism potential, tourism indicators, patterns of tourism products, and the current tourism management. This analysis revealed that there are a number of positive trends, but also the need to strengthen the measures that support high value added tourism products that allow avoiding the threat of numerous visitors and the development of mass tourism infrastructure. The relevance of these conclusions is limited by

  11. The fauna of endoparasites in Acipenser ruthenus Linnaeus, 1758 from the Serbian part of the Danube River

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    Cakić P.

    2008-01-01

    Full Text Available Helminths of sterlet (Acipenser ruthenus L. from the Danube River were studied as a part of ichthyoparasitological research in Serbia. The fish were collected during the period of 2002 - 2003 along the Danube's course through the Belgrade region. A total of 517 specimens of sterlet of different ages (0+ to 1+ were examined. Helminths were found in 342 or 66.15% of the collected specimens. The examined fish yielded a total of 13 helminth species: four species of Trematoda, one species of Cestoda, four species of Nematoda, and four species of Acanthocephala.

  12. Prodeinotherium bavaricum (Proboscidea, Mammalia from the Middle Miocene tuffaceous sediments near Svinná (Danube Basin, Slovakia

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    Csaba Tóth

    2013-12-01

    Full Text Available An isolated p4 of Prodeinotherium bavaricum (von Meyer, 1831 from the Middle Miocene (Sarmatian sediments of Svinná (the Danube Basin, Slovakia is morphometrically described and compared with similarly preserved coeval material from the neighbouring countries. The material points to the taxonomic identification of isolated deinothere p4 teeth based on the combination of size, WI index and the paracristid morphology. The material presented herein is the only occurrence of the Middle Miocene deinothere from the Slovakian part of the Danube Basin.

  13. METHOD TO ASSESS THE EXTREME HYDROLOGICAL EVENTS IN DANUBE FLUVIAL DELTA

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    MARIAN MIERLĂ

    2012-03-01

    Full Text Available Method to assess the extreme hydrological events in Danube fluvial Delta. In this paper the subject is about of testing a method for Romania to assess the extreme hydrological events. In this paper through hydrological extreme events it should be understood as the extreme droughts and the extreme flooding. The place to be tested this method for Romania is the Danube Delta, fluvial delta to be more precisely. The importance of the area consists in the fact that is the third Delta of the Europe (after the Volga’s and Kuban’s. The method that is supposed to be tested on a specific part of the delta is aiming to rise the knowledge about the extreme hydrological events (drought and flooding and to be able to respond in an appropriate way to these. For this paper it will be taken into account the hydrological events occurred in 2003 (the exceptional drought and in 2006 (the exceptional flood. To do the analysis there were used satellite images (LANDSAT from the period that was taken into account and additional there were used the hypsometrical model of the Danube Delta for the specific area. The first two datasets (2003 and 2006 satellite images give information about were the border of the water (in drought period and respective in flooding one reached. The second dataset (the delta’s hypsometry give information about the altitude of the terrain in order to establish which areas, at a certain water level, are flooded. The result of these datasets combination is the calibration of the hypsometrical model of the Danube Delta, in that region, regarding the hydrological events in the sense of building-up the hydrograds as isolines. The new approach of this matter can be more concrete and makes easier to see on the cartographic support the hydrologic events. The information obtained from these datasets makes the awareness regarding the extreme hydrological events to be higher and respective the measures taken to mitigate these will be more efficient.

  14. Observations on the shelter-belt planted around the Danube Cement Works (near Vac, Hungary)

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    Klincsek, P.

    1977-01-01

    Almost simultaneously with the establishment of the Danube Cement Works, an experimental shelter belt composed of a variety of tree species was planted in the neighborhood. The volumes of the different tree species were determined in order to discover which of them was able to grow, in spite of the constant pollution. The development of the 15 tree species showed considerable variation. Under the conditions of this test, the tree species Populus robusta, Cerasus avium, Elaeagnus angustifolia, and Pinus silvestris are excellently suited for the establishment of a green belt. 14 references, 6 figures.

  15. Seasonal variations of bisphenol A in the Danube River by the municipality of Novi Sad, Serbia

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    Milanović Maja

    2016-01-01

    Full Text Available Seasonal variations of bisphenol A (BPA were investigated in the Danube along the Novi Sad bank, Serbia using solid-phase extraction followed by gas chromatographic mass spectrometric method. The obtained results confirmed the presence of BPA above the limit of quantification (6 ng/L in 22 out of 32 water samples at all eight sampling sites. Тhe BPA concentration varied from 1 for autumn, spring and summer. The high potential risk which is attributed to the elevated summer concentrations is probably the result of the increased human activates and weather conditions. [Projekat Ministarstva nauke Republike Srbije, br. III46009

  16. The significance of the Danube ecological corridor in the proceedings of implementing ecological networks in Serbia

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    Filipović Dejan

    2015-01-01

    Full Text Available With the modern processes for exploiting land people have altered the original appearance of areas and created cultural environments. The remaining natural environments, whether protected or not, take up a relatively small portion of space and represent isolated islands which in itself can not be sufficient for the preservation of biodiversity or for the fulfillment of national, regional or international goals and commitments related to their preservation. In order to secure the preservation of biodiversity, the strengthening of integrity and the natural processes, such as animal migrations, succession of vegetation and evolution processes, the communication between natural habitats is imperative. Ecological corridors, as integral elements of ecological networks, ensure the preservation of vital ecological interactions by providing a connection between different habitats or areas. Depending on a range of factors, from the fulfillment of demands of different species to the connecting of regions, corridors of local, sub-regional, regional and international importance are identified. The Danube ecological corridor is one of the most significant corridors of international importance which encompasses a large number of habitats which are part of the natural watercourse of the corridor. There are numerous protected areas in the Danube coastal area on Serbia's territory which present themselves as central areas for forming the ecological network, such as: Gornje Podunavlje, Karađorđevo, Fruška Gora, Titelski Breg hill, Kovalski rit marsh, Dunavski loess bluffs, the Sava mouth, Labudovo okno, Deliblato sands, Đerdap and Mala Vrbica. The diverse and mosaic vegetation of the floodplain, as well as the consistency of the protected areas within the Danube corridor have a direct influence on the quality and functionality of this corridor. The goal of this paper is to show the significance of the Danube ecological corridor in the process of implementing

  17. Spatial and seasonal distribution of chromophoric dissolved organic matter in the Upper Paraná River floodplain environments ( Brazil Distribuição espacial e sazonal da matéria orgânica dissolvida cromófora em ambientes da planície de inundação do alto rio Paraná (Brasil

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    Mariana Carolina Teixeira

    2011-12-01

    Full Text Available AIM: Our aim was to identify dissolved organic matter (DOM main sources in environments of the Upper Paraná River floodplain and their seasonal and spatial variation. METHODS: Ultraviolet-visible and fluorescence spectroscopy were utilized. The samples were obtained from November 2007 to September 2008 in six lakes of the floodplain. RESULTS: DOM quality differs among environments and also between rainy and dry season. The environments connected with Paraná River showed a high variation on the allochthonous/autochthonous proportion. Aquatic macrophytes might represent an important contribution to DOM in Garças and Osmar lakes. CONCLUSIONS: In general, environments connected to Paraná River have a greater influence of autochthonous DOC, while the others are most influenced by allochthonous inputs.OBJETIVO: O objetivo deste estudo foi identificar a origem da matéria orgânica dissolvida (MOD em ambientes da planície de inundação do alto rio Paraná e sua variação sazonal e espacial. MÉTODOS: Para tal, foram utilizadas técnicas de espectroscopia ultravioleta-visível e de fluorescência. As amostras foram coletadas no período de novembro de 2007 a setembro de 2008 em seis lagoas da planície de inundação. RESULTADOS: A qualidade da MOD difere entre ambientes e também entre as estações seca e chuvosa. Os ambientes conectados ao rio Paraná apresentaram grande variação na proporção autóctone/alóctone. Macrófitas aquáticas podem representar uma contribuição importante à MOD nas lagoas Garças e Osmar. CONCLUSÕES: Em geral, ambientes conectados ao rio Paraná têm maior influência de COD autóctone, enquanto os demais têm maior influência de COD alóctone.

  18. Species richness of testate amoebae in different environments from the upper Paraná river floodplain (PR/MS = Riqueza de amebas testáceas em diferentes ambientes da planície de inundação do alto rio Paraná (PR/MS

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    Deise de Morais Costa

    2011-07-01

    Full Text Available This study evaluated the species richness of testate amoebae in the plankton from different environments of the upper Parana river floodplain. Samplings were performed at subsurface of pelagic region from twelve environments using motorized pump and plankton net (68 ƒÝm, during four hydrological periods. We identified 67 taxa, distributed in seven families and Arcellidae, Difflugiidae and Centropyxidae were the most representative families. Higher values of species richness were observed in the lakes (connected and isolated during the flood pulses. Centropyxis aculeata, Difflugia gramem and D.pseudogramem were frequent throughout the study period. Seasonal variability of species in the channels and isolated lakes was evidenced by beta diversity. Besides that, in the rivers, extreme changes in species composition were verified during the high-water period. Our results highlight the importance of the present study to improve the knowledge about the diversity and geographic distribution of these organisms in Brazil and emphasize the importance of current flow in the displacement of testate amoebae from their preferredhabitats, marginal vegetation and sediment.Este estudo objetivou avaliar a riqueza de taxons de amebas testaceas no plancton de diferentes ambientes da planicie de inundacao do alto rio Parana. Foram amostrados 12 pontos da regiao pelagica em diferentes ambientes (rios, canais e lagoas e em quatro periodos hidrologicos. Foram identificados 67 taxons, distribuidos em sete familias. Arcellidae, Difflugiidae e Centropyxidae foram as familiasmais especiosas. Nas lagoas (abertas e fechadas, durante os pulsos de inundacao, foram observados os maiores valores para a riqueza de especies. Centropyxis aculeata, Difflugia gramem e D. pseudogramem foram frequentes durante todo o periodo estudado. Os dados obtidos pela diversidade beta evidenciaram a variabilidade sazonal das especies nos canais e lagoas fechadas. Nos rios, as alteracoes

  19. Flebotomíneos de várzea do rio Aguapeí, região noroeste do Estado de São Paulo, Brasil Sand flies in the Aguapeí river floodplain, northwest area of State of São Paulo, Brazil

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    Rosa M F N Odorizzi

    2007-08-01

    Full Text Available OBJETIVO: Investigar a sazonalidade de flebotomíneos de acordo com sua ocorrência e densidade. MÉTODOS: A pesquisa for realizada em área de várzea do rio Aguapeí, do município de Mirandópolis, Estado de São Paulo. Os flebotomíneos foram capturados mensalmente com armadilhas automáticas luminosas, instaladas das 18:00 às 7:00 horas, durante um ano (2004-2005, em dois locais: varanda de um rancho de pesca e mata. Utilizou-se a média de Williams para o cálculo da sazonalidade dos flebotomíneos e teste de qui-quadrado para comparação. RESULTADOS: Foram capturados 35.995 flebotomíneos. Cinco espécimes eram Brumptomyia avellari, um Psathyromyia (Xiphomyia hermanlenti e os demais Nyssomyia neivai, que apresentou freqüência mais elevada no inverno. É o primeiro registro de Ps. hermanlenti no Estado. CONCLUSÕES: A alta densidade de Nyssomyia neivai, um dos vetores suspeitos de transmitir a leishmaniose tegumentar americana, aponta o risco de transmissão dessa doença no local, principalmente nos períodos mais secos do ano.OBJECTIVE: To investigate the seasonal variation of sand flies regarding their occurrences and densities. METHODS: The study was conducted in the Aguapeí river floodplain in the state of São Paulo, southeastern Brazil. Sand flies were monthly captured with automatic light traps set up between 18:00 and 7:00 hours, over a period of one year (2004-2005, at two sites: veranda of a domicile and in a forest on the banks of Aguapeí River. The Williams' average was used for estimating the seasonal variation and the Chi-square test for comparison. RESULTS: A total of 35,995 specimens were captured: five Brumptomyia avellari, one Psathyromyia (Xiphomyia hermanlenti and the rest Nyssomyia neivai, which had the highest frequency during the winter. Ps. hermanlenti is first recorded in state of São Paulo. CONCLUSIONS: The high density of Nyssomyia neivai, a suspected vector of cutaneous leishmaniasis, points out to the

  20. Parasitic copepods in the nasal fossae of five fish species (Characiformes from the upper Paraná river floodplain, Paraná, Brazil = Copépodes parasitos de fossas nasais de cinco espécies de peixes (Characiformes da planície de inundação do alto rio Paraná, Paraná, Brasil

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    Ana Carolina Figueiredo Lacerda

    2007-10-01

    Full Text Available The present work had the objective to study parasitic copepods in thenasal fossae of fish from the upper Paraná river floodplain. Fish were captured in different locations of the floodplain in March, June and September, 2004. A total of 73 specimens (Characiformes were collected, belonging to 4 distinct families and 5 species: Acestrorhynchus lacustris (Acestrorhynchidae, Schizodon borellii (Anostomidae, Prochilodus lineatus (Prochilodontidae, Serrasalmus marginatus and Serrasalmus maculatus (Serrasalmidae. Among 73 fishes examined, 53 were parasitized by nasal fossae copepods, varying from 1 to 146 parasites per host. Parasites found belonged to 3 known species: Gamidactylus jaraquensis Thatcher & Boeger, 1984; Gamispatulus schizodontis Thatcher & Boeger, 1984; and Rhinergasilus piranhus Boeger & Thatcher, 1988. There were differences in parasite corporal measurements and in the quantity of parasites per host in relation to copepod parasites from the Amazon region. The present study constitutes one of the few studies of identification of copepod parasites in the nasal fossae of fish from the Southern region of Brazil.O presente trabalho teve como objetivo o estudo de copépodes parasitos de fossas nasais de peixes da planície de inundação do alto Rio Paraná. As coletas foram realizadas em diversos pontos da planície nos meses de março, junho e setembro de 2004. Foram coletados 73 exemplares de peixes da ordem Characiformes, de quatrofamílias distintas, pertencentes a cinco espécies: Acestrorhynchus lacustris, Prochilodus lineatus, Schizodon borellii, Serrasalmus maculatus e Serrasalmus marginatus. Dentre os 73 peixes examinados, 53 encontravam-se parasitados por copépodes de fossas nasais,variando de 1 a 146 parasitos por peixe. Os parasitos encontrados pertenciam a três espécies conhecidas: Gamidactylus jaraquensis Thatcher & Boeger, 1984; Gamispatulus schizodontis Thatcher & Boeger, 1984 e Rhinergasilus piranhus Boeger & Thatcher

  1. Influência do nível hidrológico sobre a assembléia de peixes em lagoa sazonalmente isolada da planície de inundação do alto rio Paraná Influence of the hydrological level on an assemblage of fishes at a seasonally isolated lagoon of the Upper Paraná River floodplain

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    Samuel Veríssimo

    2002-05-01

    Full Text Available A finalidade deste trabalho foi avaliar o efeito de diferentes períodos hidrológicos na estrutura da assembléia de peixes da lagoa Canal do Meio, planície de inundação do alto rio Paraná, considerando-se alguns atributos das assembléias, tais como: riqueza, diversidade, eqüitabilidade, densidade e standing crop. A densidade específica foi estimada em anos com diferentes níveis hidrológicos, utilizando-se o método de verossimilhança máxima de Zippin. O primeiro ano analisado, 1996, foi caracterizado por baixos níveis de cheia, curto período de inundação e inundação interrompida. Em 1998, o oposto foi observado. As diferenças entre as assembléias de peixes foram atribuídas aos diferentes níveis de cheia. Riqueza das espécies, densidade total e, especialmente, a densidade de peixes migradores foi menor em 1996. Esses resultados demonstram a importância da continuidade e da duração do período de inundação (como observado em 1998 para a conservação da biodiversidade de peixes em ecossistemas de planície de inundação.The purpose of this paper was to assess the effect of different hydrological periods on the structure of a fish assemblage at Canal do Meio Lagoon (Upper Paraná River floodplain, taking into account richness, diversity, equitability, density and standing crop. Specific density was estimated in years with different hydrological regimes, by using the Zippin maximum likelihood method. The first year analyzed, 1996, was characterized by low water levels, short inundation period and interrupted floods. In 1998, the opposite was observed. The differences in the fish assemblages was attributed to these differences in hydrological regimes. Species richness, overall density and, specially, the density of migratory fishes was lower in 1996. These results demonstrate the importance of uninterrupted and long floods (as observed in 1998 to the conservation of fish biodiversity in floodplain ecosystems.

  2. Hábitos alimentares e sobreposição trófica das raias Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae na planície alagável do alto rio Paraná, Brasil = Feeding habitats and trophic overlap of the freshwater stingrays Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae in the upper Paraná river floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    Milza Celi Fedatto Abelha

    2006-07-01

    Full Text Available As raias Potamotrygon falkneri e Potamotrygon motoro foram avaliadas em relação à composição de suas dietas e a sobreposição do nicho trófico nos períodos de seca (agosto/2004 e cheia (janeiro/2005 na planície alagável do alto rio Paraná, em três estações de coleta próximas à ilha Mutum. Foram analisados 49 conteúdos estomacais de P. falkneri e 16 de P. motoro, obtidos de espécimes capturados através de pesca com anzol, fisga (arpão e espinhel. Os conteúdos estomacais foram analisados de acordo com os métodos de freqüência volumétrica e de ocorrência. A similaridade da dieta foi quantificada pelo índicede sobreposição de Pianka. As espécies revelaram flexibilidade alimentar, com ambas consumindo predominantemente moluscos na cheia, enquanto na seca a dieta de P. falkneri foi composta principalmente por peixes e a de P. motoro por insetos aquáticos. Os valores doíndice de sobreposição de nicho variaram entre 0,38 na seca (moderado e 0,94 na cheia (acentuado. A variação da composição das dietas foi atribuída às oscilações na disponibilidade dos recursos alimentares no ambiente.Feeding habits and trophic overlap of freshwater stingrays Potamotrygon falkneri e Potamotrygon motoro were evaluated in the upper Paraná river floodplain. Samples were collected during periods of drought (August/2004 and flood (January/2005 near Mutum island. Fishhook, harpoon and long line were used to capture the individuals and a total of 49 stomach contents of P. falkneri and 16 of P. motorowere analyzed. Diet composition was analyzed by the relative occurrence and volumetric frequencies. The trophic overlap was quantified by the index of niche overlap of Pianka. Results indicated that both species predominantly consumed mollusks during the floodseason, while in the drought season the diet of P. falkneri was composed mainly by fish and P. motoro for aquatic insects. The values of the index of niche overlap varied from 0.38, in

  3. O gênero Eugenia L. (Myrtaceae na planície de alagável do Alto Rio Paraná, Estados de Mato Grosso do Sul e Paraná, Brasil The genus Eugenia L. (Myrtaceae on the Upper Paraná River floodplain, Mato Grosso do Sul and Paraná States, Brazil

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    Mariza Barion Romagnolo

    2006-09-01

    Full Text Available Foi realizado o levantamento das espécies de Eugenia L. da planície alagável do Alto Rio Paraná, Estados de Mato Grosso do Sul e Paraná (22º40' a 22º55'S e 53º10' a 53º40'W. Esta área localiza-se no domínio da Floresta Estacional Semidecidual e apresenta formações ripárias ao longo do rio Paraná, de suas ilhas e de seus tributários. As espécies registradas foram: Eugenia egensis DC., E. florida DC., E. hyemalis Cambess., E. klappenbachiana Mattos & D. Legrand, E. moraviana O. Berg, E. pyriformis Cambess., E. ramboi D. Legrand, E. repanda O. Berg., E. sulcata Spring. ex Mart. e E. uniflora L. Os meses que apresentaram o maior número de espécies em floração e frutificação foram respectivamente, setembro e novembro. Eugenia florida, E. hyemalis e E. repanda apresentam ampla distribuição na área, enquanto que E. ramboi e E. sulcata foram encontradas somente na margem esquerda do rio Paraná. É fornecida uma chave para a identificação das espécies, acompanhada de ilustrações e descrições das mesmas, além de informações sobre o período de floração, frutificação e distribuição na área estudada.A floristic survey of Eugenia L. species of the Upper Paraná River floodplain in Mato Grosso do Sul and Paraná States, Brazil (22º40'-22º55'S; 53º10'-53º40'W is presented. The study area is covered by Seasonal Semideciduous Forest, with riparian formations along the Paraná River and its islands and tributaries. The following species were identified: E. egensis DC., E. florida DC., E. hyemalis Cambess., E. klappenbachiana Mattos & D. Legrand, E. moraviana O. Berg, E. pyriformis Cambess., E. ramboi D. Legrand, E. repanda O.Berg., E. sulcata Spring. ex Mart., and E. uniflora L. The greatest number of species in flower or fruit was detected in September and November, respectively. Eugenia florida, E. hyemalis and E. repanda are widely distributed in the study area, whereas E. ramboi and E. sulcata were observed only

  4. 景观规划对滩地型旅游地旅游资源类型的多样化促进分析——以郑州黄河滩地为例%Diversification analysis on the tourism resources types of the floodplain tourist destination promoted by landscape planning——a case study in the Yellow River floodplain of Zhengzhou City,China

    Institute of Scientific and Technical Information of China (English)

    乔丽芳; 李东升; 郑树景

    2008-01-01

    景观规划可以有效增加滩地型旅游地的旅游资源的类型.以郑州市黄河滩地为例,定量化分析景观规划前后旅游资源类型的变化.郑州黄河滩地原旅游资源有主类7、亚类16、基本类型25.通过景观规划使旅游资源类型达到主类8、亚类25、基本类型68,较景观规划前分别增加了14%、56%、172%.地文景观、水域景观、生物景观、天象与气候景观、遗址遗迹、建筑与设施、旅游商品、人文活动等的基本类型新增教分别占总数的20%、33%、45%、67%、0、80%、100%、80%.郑州黄河滩地的旅游资源主类、亚类、基本类型占全国的比例分别由景观规划前的87.5%、51.6%、16.1%提高到100%、76%、43.9%,分别增加了12.5%、24.4%和27.8%.%Landscape Planning can effectively raise the tourism reoources types of floodplain tourist destination.As a case study in the Yellow River floodplain of Zhengzhou City,we analyzed the quantitative changes in types of tourism resoures before and after the landscape plan-ning.The former tourism resources of the Yellow River floodplain of Zhengzhou City include 7 main classes,16 subclasses and 25 basic types.New tourism resources have been constructed through landscape planning,consisting of 8 main classes,25 subclasses and 68 basic types,with the increasing rate of 14%.56%,and 172%respectively.The increases in landscape,water landscape,biological landscape,sky and cli-mate landscape,relics sites,buildings and facilities,tourism commodities and cultural activities account for 20%,33%,45%,67%,0.80%,100%,80%of the total respectively.The proportions of the main elaeses,subclasses and basic types of Yellow River floodplain tourism resources to those of the whole country have increased from 87.5%,51.6%,16.1% to 100%,76%and 43.9%,with the increasing rate of 12.5%,24.4%,and 27.8%respectively.

  5. Novas ocorrências de Lecane no plâncton de distintos ambientes da planície de inundação do alto rio Paraná (Brasil - DOI: 10.4025/actascibiolsci.v30i2.3636 New occurrences of Lecane in plankton in different environments of the upper Paraná river floodplain - DOI: 10.4025/actascibiolsci.v30i3.3636

    Directory of Open Access Journals (Sweden)

    Claudia Costa Bonecker

    2008-05-01

    Full Text Available planície de inundação do alto rio Paraná possui grande diversidade de rotíferos, com 288 táxons planctônicos registrados. Estudos realizados, nesse ecossistema, desde 1992, mostram que Lecanidae é a família mais especiosa, com 45 táxons registrados. Este trabalho teve como objetivo investigar a ocorrência dessa família em ambientes ainda não-estudados e consequentemente contribuir para a diversidade de rotíferos nessa planície de inundação. Foram registradas sete novas ocorrências de Lecane em amostras do plâncton: L. bifurca, L. rhytida, L. subtilis, L. crepida, L. bulla styrax, L. obtusa, e L. thienemanne. Embora os táxons descritos fossem encontrados no plâncton, essa família caracteriza-se por ser tipicamente não-planctônica. Dessa forma, visando ampliar o conhecimento sobre a diversidade dessa família na planície de inundação do alto rio Paraná, estudos exclusivamente taxonômicos devem explorar a grande heterogeneidade de hábitats presente nessa planície, como, por exemplo, a região marginal e as extensas áreas colonizadas por macrófitas aquáticas.The upper Paraná river floodplain possesses a great diversity of rotifers, with 288 planktonic taxa recorded. Surveys performed in this ecosystem since 1992 have shown that Lecanidae is the most abundant family, with 45 registered taxa. The main goal of the present study was to investigate the occurrence of this family in environments that have not yet been studied. Seven new occurrences of Lecane were recorded in plankton samples: L. bifurca, L. rhytida, L. subtilis, L. crepida, L. bulla styrax, L. obtusa, and L. thienemanne. Although the described taxa were found in plankton, this family is characterized by being typically non-planktonic. As such, exclusively taxonomic studies must explore the great habitat heterogeneity in this floodplain, e.g., the littoral region and the extensive areas colonized by aquatic macrophytes, aiming to expand knowledge on the

  6. Origin of hydrocarbons in the Slovak part of the Danube Basin

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    Milička Ján

    2015-12-01

    Full Text Available The Danube Basin is one of our largest Neogene basins in Slovakia with the highest volume of potential source rocks in active hydrocarbon generation zones. The source rocks, however, are quite poor with low hydrocarbon potential. In Blatné- and Rišňovce depressions at the northern part of the Danube Basin only early oil and oil generation window were reached below 2900 m during the Upper Miocene to Pliocene, due the lower temperature. In the southern Central Gabčíkovo Depression (CGD that is explored by drilling only to 2700 m, all generation zones up to dry gas zone have been reached according to modelling. While the oil generation zone was reached at approximately 2800 m, dry gas is expected below 4000 m. The natural gas molecular composition and methane carbon isotopes indicate small local natural hydrocarbon gas accumulations associated mostly with oil generation that migrated to present reservoirs and mixed with biogenic methane. The carbon dioxide and partly also nitrogen here are most likely related to volcanic activity. The gasoline hydrocarbon range indicates that non biodegraded gasoline oil from the FGČ1 Čilistov well in the CGD is thermally very mature, with its origin most likely in the deeper parts of the CGD below 3500 m. In contrast, the oil trace from Sereď5 (Se5 well is strongly biodegraded and according to the sterane correlations it could have originated in any examined Neogene source reaching the oil window.

  7. Socio-economic features of commercial fishery in the bordering upper Danube River area of Serbia.

    Science.gov (United States)

    Smederevac-Lalić, Marija; Pešić, Radmilo; Cvejić, Slobodan; Simonović, Predrag

    2012-05-01

    The multidisciplinary socio-economic study of fisheries in the bordering part of the Danube River between Serbia and Croatia (at the following sites: Apatin, Bačka Palanka, Bačko Novo Selo, Bezdan, and Sombor) that was performed in order to investigate various aspects of fish resource utilization (management, policy of protection and exploitation of freshwater fishery resources, present fisheries legislation, catch statistics), was realized during 2004 and 2005. Data were collected via survey with a structured interview. Socio-economic circumstances, together with ecological factors, have had an influence on the fish stock and number of commercial fishermen. Awareness of the occurring problems, both economic and ecological ones, is apparent, regardless of whether it is assessed in the field of commercial or recreational fishing. Fishery sector in Serbia is in a prolonged process of transition, with the enforcement of fishing regulations, but also the lack of control that leaves space for illegal commercial fishing. The statements, consciousness, experience and behavior of commercial fishermen represent a good basis for planning the sustainable development of fishing in this section of the Danube River.

  8. STUDY REGARDING TO AGGRESSIONS ON THE ECOSYSTEM DANUBE DELTA – BLACK SEA AND PROTECTIVE MEASURES

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    Ion Gr. IONESCU

    2014-06-01

    Full Text Available Danube Delta has suffered damages of habitat and species loss caused by factors, including: construction of dams upstream have degraded obviously flooding regime; creation of agricultural and fishing enclosures which decreased the natural and original surfaces; extending artificial navigation channels that negatively affected the hydrological regime and water quality of lakes; increase of nutrients in the water, industrial pollution and accumulate effluents that led to the reduction of plant and bird species; attempt to exploit quartz sand, very pure and fine, the sea levees, although they were protected as nature reserves because of the specific morphology and sub-Mediterranean vegetation covering them; tourism and illegal fishing; mismanagement of resources of reed and fish. The fact is that there was a slight improvement for the marine ecosystem, reported since the early 90s. At present, the area of the Danube Delta - Black Sea is developing sustainable, in terms of medium and economic perspective. In my study I used comparative methods, investigations, direct observations, measurements, calculations and actual data, obtained from surveys and direct observations, from prestigious, specialized and authorized institutions.

  9. STUDY REGARDING TO AGGRESSIONS ON THE ECOSYSTEM DANUBE DELTA – BLACK SEA AND PROTECTIVE MEASURES

    Directory of Open Access Journals (Sweden)

    Ion Gr. IONESCU

    2014-06-01

    Full Text Available Danube Delta has suffered damages of habitat and species loss caused by factors, including: construction of dams upstream have degraded obviously flooding regime; creation of agricultural and fishing enclosures which decreased the natural and original surfaces; extending artificial navigation channels that negatively affected the hydrological regime and water quality of lakes; increase of nutrients in the water, industrial pollution and accumulate effluents that led to the reduction of plant and bird species; attempt to exploit quartz sand, very pure and fine, the sea levees, although they were protected as nature reserves because of the specific morphology and sub-Mediterranean vegetation covering them; tourism and illegal fishing; mismanagement of resources of reed and fish. The fact is that there was a slight improvement for the marine ecosystem, reported since the early 90s. At present, the area of the Danube Delta - Black Sea is developing sustainable, in terms of medium and economic perspective. In my study I used comparative methods, investigations, direct observations, measurements, calculations and actual data, obtained from surveys and direct observations, from prestigious, specialized and authorized institutions.

  10. Actual contamination of the Danube and Sava rivers at Belgrade (2013

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    Antonijević Milan D.

    2014-01-01

    Full Text Available This study is focussed on a comprehensive investigation on the state of pollution of Danube and Sava rivers in Belgrade region. Different complementary analytical approaches have been used covering both (i organic ccontaminants in river water by target analyses of hormones and neonicotinoids as well as non-target screening analyses and (ii heavy metals in sediments. Finally, some common water quality parameters have been analysed. The overall state of pollution is on a moderate level. Bulk parameters did not reveal any unusual observation. Also quantification of preselected organic contaminants did not point to elevated pollution. A more significant contamination was measured for chromium, nickel, zinc and partially copper in sediments with values above target values according to Serbian regulations. Lastly, non-target screening analysis revealed a wider spectrum of organic contaminants comprising pharmaceuticals, technical additives, personal care products and pesticides. The study presented a comprehensive view on the state of pollution of Sava and Danube rivers and is the base for setting up further monitoring programs. As a superior outcome it has been illustrated how different chemical analyses can point to different assessments of the river quality. The comparison of target and non-target analyses pointed to potential misinterpretation of the real state of pollution.

  11. N, P, and heavy metal dynamics in wetlands and lakes of the Danube Delta, Romania

    Energy Technology Data Exchange (ETDEWEB)

    Lajtha, K.; Keller, B.; Jamil, A. [Oregon State Univ., Corvallis, OR (United States)]|[Boston Univ., MA (United States)]|[Univ. of Bucharest (Romania)] [and others

    1995-09-01

    The Danube Delta stands at the interface between the Danube and the western Black Sea. Although it is assumed that such extensive wetlands can effectively filter nutrients and pollutants from surrounding waters, recent anthropogenic factors such as increased loading from upstream sources, dredging, channelization, and engineering impoundments may all serve to decrease the filtering potential of the marshes. We sampled sediments, water, and mussels from lakes, and plants and sediments from marshes along an eastward gradient as well as with distance from a main channel in the Delta to examine controls on filtering efficiency. N and P in water decreased with distance from the western gateway, although the magnitude of this decrease varied among years with changes in hydrology. Heavy metals in roots of Phragmites did not vary predictably over this gradient, although concentrations in roots from dredged channel sediments were significantly higher than in roots from natural marshes. Accumulation in mussels reflected hydrologic flow within the Delta, which may be significantly altered by channelization and dredging.

  12. Lifelong Learning and Employability in the Danube Region Countries: Influences and Correlations

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    Constanţa-Nicoleta Bodea

    2016-08-01

    Full Text Available A continuous challenge for education and lifelong learning is to assist individuals in acquiring skills and knowledge for successful work life, especially after the financial crisis which influenced negatively the employment growth in all European Union countries. The paper focuses on finding correlations between employability and lifelong learning in the Danube Region countries of the European Union and more explicitly in the ex-communist ones of this region. As research instruments, two online questionnaires were built based on a thorough literature review and a set of structured interviews and filled in by 390 IT students and 55 IT professors. The surveys’ results revealed a clear positive correlation between the level of education and the opinion about the importance of obtaining a job as a result of the educational endeavors. A special attention in the survey was given to social networks, which were acknowledged as modern facilitators of lifelong learning activities. The conclusions of the current study are particularly important in the Romanian context, as the employment rate of recent graduates is in a decreasing trend, but also for all the Danube Region ex-communist countries, which have to boost their employment rates as well, to assure their economical growth. Identification of factors stimulating employment of young people according with their education contributes at the sustainable economic growth of these countries, at the growth of graduates insertion in the labor market and at the diminution of labor migration.

  13. Assessing the potential skill of seasonal streamflow forecasting for the River Rhine and the Upper Danube Basin

    Science.gov (United States)

    Klein, B.; Meissner, D.; Gerl, N.; Hemri, S.; Gneiting, T. J.

    2013-12-01

    Reliable seasonal streamflow forecasts could be a valuable tool for the medium-term to long-term planning of many users of the water sector. Especially for the optimization of hydropower generation and the water-related logistic transportation chain the knowledge about the possible future evolution of streamflows within the next 1 to 6 months would be an important additional information in the decision process. Although there is a strong need for seasonal forecast products there is no operational forecasting system available for the large rivers in Germany. One of the main reasons is that the long-term meteorological predictability, especially for precipitation, is quite limited over Central Europe. Potential gain of predictability in the hydrological system that makes us believe that skillful seasonal streamflow forecasts in Central Europe are not out of reach is the hydrological memory and the delayed and damped system response of river basins. Natural (like snow pack, groundwater, soil moisture) as well as man-made reservoirs and dams have a large influence on the future runoff. In hydrological forecasting this memory is represented by the initial conditions of the hydrological model. In addition the streamflow at a gauge is an integrated system response with the meteorological variables as system input. If there is at least some valuable information in the numeric seasonal weather forecasts about the future evolution of precipitation and temperature as the main drivers of the hydrological processes, it could be possibly assessed through spatial (considering larger catchments) and temporal aggregation (e.g. monthly mean runoff values instead of daily values). In this contribution the potential skill of seasonal streamflow forecasting is evaluated for River Rhine and the Upper Danube Basin (up to the gauge Vienna). Different spatial and temporal scales are considered as well as different meteorological forcings. Two different hydrological models are applied in

  14. Methodological Foundation for Preparation of Teachers-Philologists for Intercultural Communication of Schoolchildren in the Danube Region

    Directory of Open Access Journals (Sweden)

    Natalia Mushynska

    2013-08-01

    Full Text Available In the given article the problem of the formation of intercultural communication of teachers-philologists in the countries of Danube Region is analyzed. Methodological foundation for preparation to intercultural communication, as one of the priorities of modern education, is under consideration.

  15. Extending the area of investigation of fine versus coarse quartz optical ages from the Lower Danube to the Carpathian Basin

    DEFF Research Database (Denmark)

    Timar-Gabor, Alida; Constantin, Daniela; Marković, S.B.;

    2015-01-01

    Despite the general satisfactory performance of quartz in the single aliquot regeneration protocol (SAR), previous optically stimulated luminescence (OSL) dating studies of key loess sections in Romania, Lower Danube region, revealed a disturbing disagreement among the ages obtained on fine (4e11...

  16. The Danube and the Sava in Strabo’s Geography and in Roman Inscriptions

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    Marjeta Šašel Kos

    2010-12-01

    Full Text Available The Danube, once considered the most important river of Europe, is referred to by Strabo in several passages. Of the greatest interest is the information recorded in his Book 7, which is largely dedicated to the Balkan peninsula and to the adjacent regions. The Danube as an important boundary river is mentioned at the very beginning of the book, which defines the geographical extent of the area. The importance of the Danube as one of the largest rivers was already perceived by Herodotus, who describes the Ister as the most important of all rivers known to him and locates its source somewhere in the west. Its sources are a day’s walk away from Lake Constance and were discovered by Tiberius only in 15 B.C. – another fact recorded by Strabo. A similar evaluation of the Danube’s importance was made c. 150 years later by the historian Appian, who provides a surprising amount of geographical data. He broaches the subject in his very introduction, stating that the Roman Empire is largely circumscribed by two European rivers, the Rhine and the Ister: the Rhine flows into the northern ocean, and the Ister into the Black Sea. But there are peoples who are under Roman control even beyond these rivers: some groups of Celts beyond the Rhine, and some groups of the Getae named ‘Dacians’ beyond the Ister (Fig. 1.  Strabo generally refers to the river by its Thracian name, Ister, fully established among the Greeks. In Book 7, however, he explains that it has two names and that the upper section is usually called Danuvius.Danuvius/Danubius is probably a Celtic name, which referred to the river down to the cataracts at the so-called Železna vrata (‘Iron Gates’ under Singidunum (Belgrade. It was only towards the end of the 1st century B.C., when their conquering campaigns finally reached these parts, that the Romans realised it was a single river. The Scythian name for the Danube was Matoas. In Roman times, the Danube was worshipped and

  17. Stability and Dynamics in the Ukrainian Higher Danube Dialect

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    Maryna Delyusto

    2015-08-01

    Full Text Available The article deals with some dynamic processes in the Ukrainian dialect spoken in the village Shevchenkove, Kiliya district, Odessa region. The author establishes stables elements of its grammatical system which are indifferent towards influence of other languages, especially Russian and Romanian, towards the Ukrainian literary standard and neighboring dialects, and changeable ones, which have been modified since last investigations of this dialect.

  18. Cultural Resources of the Ohio River Floodplain in Illinois,

    Science.gov (United States)

    1977-10-15

    americana), hickories, .nd sweet gum, with occasional black walnut (Juailapns _igrij), butternut (Iluglans cinerea), and pecan ( Carya illinoensis ) on better...Quercius velutina), shingle oak (Quercus imbricaria), and various hickories, particularly the more xeric species such as black hickory ( Carya texana...where soil is thin or exposure hazardous. Stands of various hickories ( Carya ) are interspersed. Smaller trees might include dogwood (Cornus spp.) and

  19. Arsenic in groundwater of the Red River Floodplain, Vietnam

    DEFF Research Database (Denmark)

    Postma, Diederik Jan; Larsen, Flemming; Jessen, Søren

    2007-01-01

    The mobilization of arsenic (As) to the groundwater was studied in a shallow Holocene aquifer on the Red River flood plain near Hanoi, Vietnam. Results show an anoxic aquifer featuring organic carbon decomposition with redox zonation dominated by the reduction of Fe-oxides and methanogenesis....... The concentration of As increases over depth to a concentration of up to 550 μg/L. Most As is present as As(III) but some As(V) is always found. Arsenic correlates well with NH4, relating its release to organic matter decomposition and the source of As appears to be the Fe-oxides being reduced....

  20. Arsenic in groundwater of the Red River Floodplain, Vietnam

    DEFF Research Database (Denmark)

    Postma, Diederik Jan; Larsen, Flemming; Jessen, Søren

    2007-01-01

    . The concentration of As increases over depth to a concentration of up to 550 μg/L. Most As is present as As(III) but some As(V) is always found. Arsenic correlates well with NH4, relating its release to organic matter decomposition and the source of As appears to be the Fe-oxides being reduced.......The mobilization of arsenic (As) to the groundwater was studied in a shallow Holocene aquifer on the Red River flood plain near Hanoi, Vietnam. Results show an anoxic aquifer featuring organic carbon decomposition with redox zonation dominated by the reduction of Fe-oxides and methanogenesis...

  1. Elm Fork of the Trinity River Floodplain Management Study

    OpenAIRE

    Tickle, Greg; Clary, Melinda

    2001-01-01

    Wendy Lopez and Associates, Inc. (WLA) was asked to provide a conservation and ecological restoration overview for the City of Dallas as part of an Elm Fork Floodplain Management Study. This study encompasses a unique portion of the main stem of the Elm Fork of the Trinity River, Dallas County, Dallas, Texas. The project area includes approximately 8.5 square miles, half of which lie within a 100-year floodplain. Approximately 15% of the project area is mature bottomland hardwood forest and s...

  2. USING PHOTOS AT THE THEME THE "DANUBE DELTA"

    Directory of Open Access Journals (Sweden)

    ROXANA TEODORA MATEIU (COTOI

    2014-01-01

    Full Text Available The objective of this study is to analyze from MSc students' perspective, the task relating to the use of photographs in a subject chosen from the curriculum, the problem-solving process, and its solution. The task was given at the course "Models and Paradigms of Teaching and Learning", at the first year students of the MSc Management of the Curriculum at the Faculty of Psychology and Sciences of Education, in the 2013-2014 academic year. At the end of this study, we concluded that in analyzing and interpreting the content of a photograph with students, we can use various forms of organization or interaction, different teaching methods, and procedures. By solving the task, the MSc students developed their competences of planning learning activities starting from a specific competence and they could use that competence in the pre-university educational system.

  3. From ENSEMBLES to CORDEX: exploring the progress for hydrological impact research for the upper Danube basin

    Science.gov (United States)

    Stanzel, Philipp; Kling, Harald

    2017-04-01

    EURO-CORDEX Regional Climate Model (RCM) data are available as result of the latest initiative of the climate modelling community to provide ever improved simulations of past and future climate in Europe. The spatial resolution of the climate models increased from 25 x 25 km in the previous coordinated initiative, ENSEMBLES, to 12 x 12 km in the CORDEX EUR-11 simulations. This higher spatial resolution might yield improved representation of the historic climate, especially in complex mountainous terrain, improving applicability in impact studies. CORDEX scenario simulations are based on Representative Concentration Pathways, while ENSEMBLES applied the SRES greenhouse gas emission scenarios. The new emission scenarios might lead to different projections of future climate. In this contribution we explore these two dimensions of development from ENSEMBLES to CORDEX - representation of the past and projections for the future - in the context of a hydrological climate change impact study for the Danube River. We replicated previous hydrological simulations that used ENSEMBLES data of 21 RCM simulations under SRES A1B emission scenario as meteorological input data (Kling et al. 2012), and now applied CORDEX EUR-11 data of 16 RCM simulations under RCP4.5 and RCP8.5 emission scenarios. The climate variables precipitation and temperature were used to drive a monthly hydrological model of the upper Danube basin upstream of Vienna (100,000 km2). RCM data was bias corrected and downscaled to the scale of hydrological model units. Results with CORDEX data were compared with results with ENSEMBLES data, analysing both the driving meteorological input and the resulting discharge projections. Results with CORDEX data show no general improvement in the accuracy of representing historic climatic features, despite the increase in spatial model resolution. The tendency of ENSEMBLES scenario projections of increasing precipitation in winter and decreasing precipitation in summer is

  4. Great Danube flood peak of the late medieval - early modern transition: the 1470s-1520s

    Science.gov (United States)

    Kiss, Andrea

    2016-04-01

    As a consequence of very detailed contemporary documentation, namely legal-administrative documentation (charters) and the annual (or daily) information available in the Bratislava accounts (mainly bridgemasters' accounts), a relatively detailed picture of a massive flood peak can be detected in the Carpathian Basin documentation concerning the decades of the late 15th and early 16th centuries. These decades are one of the most important period in the millennial flood history of the Danube in this area: both concerning the number of individual flood events and regarding the information on multiannual problems. Moreover, archaeological evidence, for example the flood sediment layers in Visegrád and also the damages, structural and elevation changes of renovated buildings in Buda or along the Upper-Danube, provide similar examples of multiannual flood-related problems. Moreover, clear flood peaks can be also detected at this time on the Austrian sections of the Danube, but especially on its Eastern Alpine tributaries, centred around the 1480s and the greatest flood events of 1501, and also partly of 1503 and 1508 (best documented for the Traun at Wels: see Rohr 2007, 2013). In the poster presentation on the one hand a general overview of the documented flood events and multiannual flood-related information - based on documentary and archaeological evidence -, occurred in the Carpathian Basin are presented regarding frequency, magnitude (3-scaled classification) and seasonality information (when available). On the other hand, differences in flood frequencies, flood types and seasonality is also separately discussed on an annual and decadal scale: while, for example, in the drought-affected 1470s were characterised by ice jam floods, the great flood peak of the 1480s were both rich in ice jams and summer-flood events (with a peak in 1485 with 4 great floods). The decade of the 1500s was mainly influenced by the 1501 "deluge" and further two great flood events (and

  5. ORCONECTES LIMOSUS COLONISES NEW AREAS FAST ALONG THE DANUBE IN HUNGARY

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    PUKY M.

    2006-01-01

    Full Text Available Introduced species are one of the most important anthropogenic impacts on freshwater ecosystems with many direct and indirect effects on native taxa. Among other invasive groups, such as plants, mussels and fish, several alien Decapoda species have also spread successfully in Europe in the last 110 years. In Hungary three native (Astacus astacus, Astacus leptodactylus, Austropotamobius torrentium and three alien Decapoda species, namely Orconectes limosus, Pacifastacus leniusculus and Eriocheir sinensis are known to be present. O. limosus, which had been tried for use in crayfish farming in the 1950s, was the first to occur in the country’s natural waters. Initially it was found in the Danube at river km 1,653 at Budapest in 1985. Since then, it has been spreading fast and populations have reached high abundances. By 1998, it was already in the Gemenc section of the river colonising five 50 km × 50 km UTM squares. In the early 2000s it was also found at Mohács (and further downstream in Croatia, in canals in the Great Hungarian Plain and in the River Ipoly, which added three new 50 km × 50 km UTM squares to its previously known distribution area in the Carpathian Basin. On the basis of the available records from the past 20 years, the downstream colonisation speed of this decapod was calculated to be more than 13 km yr–1, but if its presence at Kopácsi rét/Kopacki rit in Croatia is also taken into consideration, it is over 16 km yr–1. It is unknown, however, how much this process was helped by deliberate introductions, if at all. Besides the main watercourse of Hungary, O. limosus is also common in its lowland tributaries and spreading towards Lake Balaton along the Sió canal. However, it has not been recorded entering mountain streams in the Danube Bend, where A. torrentium lives, which is important for the conservation of that native species. If O. limosus spreads with the same speed and distribution pattern in the Carpathian Basin

  6. Preliminary paleoecological reconstruction of long-term relationship between human and environment in the northern part of Danube-along Plain, Hungary

    Science.gov (United States)

    Kustár, Rozália; Molnár, Dávid; Sümegi, Pál; Törőcsik, Tünde; Sávai, Szilvia

    2016-06-01

    The peat bog at Ócsa is located at the northern part of the Danube-Tisa Interfluves at the transitional zone of two landscapes with different morphological characters. At the boundary of the Danube-Tisa Interfluves and the Danube-along Plain a marshland sequence can be found from Hajós to Ócsa. We extended our research to the Ócsa peat bog to complete the environmental historical investigations in the examined area, as well. The bog is located in a former pool formed by the Danube River in which aeolian sand and thick lake sediment deposited from the Late Pleistocene. The initial oligotrophic lake became mesotrophic, therefore thick carbonate sediment deposited. Afterwards, as a consequence of the Neolithic human occupations, the natural development of the lake changed drastically and the lake choked up. The pollen and quartermalacological analysis of the area support the mentioned geological processes.

  7. Assembléia de peixes em áreas litorâneas da planície de inundação do alto rio Paraná, Brasil Fish assemblages in littoral areas of the upper Paraná river floodplain, Brazil

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    Evanilde Benedito Cecilio

    2001-05-01

    Full Text Available A assembléia de peixes em áreas litorâneas de rios (Baía e Paraná e lagoas (Figueira, Genipapo e Pousada da planície de inundação do alto rio Paraná foi avaliada quanto à composição, estrutura em comprimento, abundância e padrões de dominância e diversidade de espécies. As amostragens foram realizadas em março de 1999, com o uso de redes de arrastes simples (rios e triplos (lagoas de 5mm de malha, resultando na captura de 10.517 indivíduos pertencentes a 51 espécies. Houve diferenças significativas entre as médias de comprimento-padrão das assembléias nos diferentes ambientes. Na lagoa Pousada registrou-se a maior densidade em número de peixes, bem como o maior valor de diversidade α, enquanto na lagoa Figueira verificou-se a maior biomassa por unidade de área. As espécies mais abundantes nesses ambientes foram Cheirodon notomelas (Eigenmann, 1915 (Baía e Figueira, Bryconamericus stramineus Eigenmann, 1908 (Paraná, Steindachnerina insculpta (Fernándes-Yépez, 1948 (Genipapo e Moenkhausia intermédia Eigenmann, 1908 (Pousada. As zonas litorâneas das lagoas apresentaram baixas similaridades entre si, o que pode estar relacionado com o padrão de conectividade dos ambientes e a forte interrupção do pulso de inundação na planície no ciclo hidrológico de 1998/1999. Esta interrupção foi provocada pelo fechamento da UHE de Porto Primavera, tornou as lagoas mais diferenciadas neste ciclo e aumentou a heterogeneidade entre elasFish assemblages in littoral areas of rivers (Baía and Paraná and lagoons (Figueira, Genipapo and Pousada on the upper Paraná river floodplain were evaluated in their composition, length structure, abundance and species dominance and diversity patterns. Samplings were carried out in March 1999, with single (for the rivers and triple (for the lagoons 5mm-mesh seine nets. Results amounted to the catch of 10,517 individuals belonging to 51 species. There were significant differences between

  8. Banco de sementes de remanescentes naturais e de áreas reflorestadas em uma várzea do Rio Mogi-Guaçu - SP Seed bank of natural forest remainders and reforestation areas in a Mogi-Guaçu river floodplain, Luiz Antônio County, São Paulo State, Brazil

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    Assíria Maria Ferreira da Nóbrega

    2009-06-01

    Full Text Available Este estudo avaliou qualitativa e quantitativamente o banco de sementes de dois remanescentes florestais, de um povoamento de Eucalyptus robusta e de três áreas de reflorestamento com espécies nativas, localizados em uma várzea do rio Mogi-Guaçu, Luiz Antônio (21°31´S e 47°55´W, Estado de São Paulo, Brasil. Foram usadas 12 parcelas de 10 x 10 m distribuídas sistematicamente em cada área de estudo. Em cada parcela foram distribuídas aleatoriamente quatro subparcelas de 0,5 m x 0,5 m. Duas subparcelas foram usadas para coletar a serapilheira e duas para coletar o solo a 0-5 cm de profundidade. A amostragem foi realizada em setembro de 2001, nos remanescentes naturais e no povoamento de eucalipto e, em setembro de 2002, nas áreas reflorestadas. As amostras foram acondicionadas em vasos de plástico e incubadas com irrigações periódicas para a germinação das sementes por um período de sete meses, em dois ambientes de casa de vegetação: um a 100% de luz solar e outro sob tela com 70% de redução de luz solar. Na composição do banco de sementes de todas as áreas amostradas, houve predominância de espécies pioneiras dos primeiros estádios de sucessão. As espécies arbóreas mais importantes foram Aloysia virgata e Cecropia hololeuca. Os reflorestamentos com espécies nativas proporcionaram um banco de sementes com maior diversidade de espécies arbóreas nativas do que o povoamento de eucalipto. Este estudo indicou que a similaridade entre as florestas plantadas e as nativas deverá aumentar ao longo do tempo.The objective of this study was to evaluate qualitative and quantitatively the seed bank of two natural forest remainders, one Eucalyptus robusta plantation and three reforestation areas with native species, located in a riparian area of Mogi-Guaçu River floodplain, in Luiz Antonio County (21°31´S and 47°55´W, São Paulo State, Brazil. The evaluation was carried out in 12 plots of 10 x 10 m systematically

  9. Regeneração natural em remanescentes florestais e áreas reflorestadas da várzea do rio Mogi-Guaçu, Luiz Antônio - SP Natural regeneration in forest remainders and reforested areas of "Mogi-Guaçu" river floodplain in Luiz Antônio county, São Paulo, Brazil

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    Assíria Maria Ferreira da Nóbrega

    2008-10-01

    > 10 cm and diameter at breast height (DBH < 5.0 cm were measured and analyzed separately in four height classes according to floristic diversity, similarity, density, frequency, dominance, importance value and natural regeneration. A total of 2,010 individuals were identified, belonging to 24 families, 46 genera and 51 species. The species with greater importance values were Cabralea canjerana, Psidium cattleyanum, Nectandra megapotamica, Acacia polyphylla and Syzygium cumini, well represented in the four height classes. Reforestation with native species in a degraded Mogi-Guaçu River floodplain promoted natural regeneration with more biodiversity than in natural remainders submitted to border effect, and contributed to the forest ecosystem restoration process. The 20-year-old Eucalyptus robusta plantation promoted the regeneration of climax and secondary species.

  10. La gestion des aires critiques: le delta du Danube entre isolement et réserve

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    Lucian Dobraca

    1999-03-01

    Full Text Available La création d'une réserve de la biosphère dans le delta du Danube a compliqué les rapports fragiles homme-environnement. L'espace du delta, structuré par les activités liées à l'eau, avait été bouleversé par des aménagements peu respectueux de l'environnement (1960-1989. La mise en place d'une administration écologiste en 1991 (objectifs scientifiques, valorisation dans la logique du développement durable, actions de contrôle et de protection a limité l'ampleur des dégâts de l'environnement, mais a multiplié les contraintes pour la vie humaine.

  11. Psychological Features of Ethnic Tolerance of Students Of Ukrainian Danube Region

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    Inna Mazokha

    2016-08-01

    Full Text Available The article is devoted to the results of theoretical research aimed at the analysis and refinement of the concept of “ethnic tolerance”, revealing its internal and external determinants and describing the approaches of different authors to the interpretation of this phenomenon. The article presents a study of manifestations’ peculiarities of ethnic tolerance in multicultural surrounding of ISUH students, as well as its prospects for the development of students’ psychology. The ethnic structure of Ukrainian Danube region is causedby the interaction of different ethnic groups (Bulgarians, Gagauz, Ukrainians, Russians, Armenians, Jews and others, which requires tolerant attitude to other nationalities. Such models of marginalization of ethnic consciousness can be traced in the region: a psychological, moral ambivalence; identity with one of the ethnic groups; double or multiple ethnic self-identity.

  12. Education and Training Needs in the Field of Consumer Protection in the Lower Danube Region

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    Vasile Dinu

    2010-11-01

    evaluate the requirement for education and training in the field of consumer protection in the Lower Danube Region, we decided to collect and study the necessary information, both at EU level as well as those specific to the counties bordering the Danube, information which sustain the need for the establishment of a new form of expert training in this field. As a result, the paper brings up aspects regarding the need for training AE Education and Training Needs in the Field of Consumer Protection in the Lower Danube Region Amfiteatru 710 Economic experts in the field of consumer protection, referring to the Romanian counties bordering the Danube and neighbouring Bulgaria. Also, this report presents the findings of a research project whose aim is to evaluate the availability of prerequisites for seeking educational products in the field of consumer protection in Bulgaria. The institutional framework of the process in Bulgaria has been analyzed and the results of a survey among the representatives of the four parties involved in it – government authorities, NGOs, consumers and suppliers – have been presented. The research presents their point of view regarding the extent to which the process of consumer protection in Bulgaria is developed, what are the major obstacles it faces, what means of improvement are there, to what extent the more active offer of educational products would facilitate the process and based on this, what would the role played by the institutions of higher education be, what types of educational products would best be realized on the market in a short-term and medium term aspect. The motivation for such research is related both to the strive to improve the status of the consumer rights protection in Bulgaria and the intention of Tsenov Academy of Economics in Svishtov, Bulgaria and the Academy of Economic Studies in Bucharest to collaborate towards intensifying the cross-border co-operation and facilitate the human resource development in the region

  13. Aquatic macrophytes from Danube Delta lagoons Musura Bay and Zatonul Mare

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    Sava D.,

    2016-05-01

    Full Text Available The Romanian Danube Delta, a unique, young and continuing to grow region situated in the eastern part of Europe, is the largest continuous marshland and the second largest delta on the continent, and also a favorable place for developing a unique flora and fauna in Europe, with many rare and protected species. The predominance of the aquatic environment, led to the existence of a particular macrophytic flora. In this context, the purpose of this paper is to contribute to the study of aquatic macrophytes. The present study took place over two years, between 2013-2014, and in each year a number of expeditions were made in the two lagoons (Musura Bay and Zătonul Mare in different seasons, in order to observe the diverse flora, because, due to seasonal variation in water quality, there might be a significantly seasonality of the vegetation also.

  14. Benthic Macroinvertebrate Communities in the Northern Tributaries of the “Iron Gates” Gorge (Danube River

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    Curtean-Bănăduc Angela

    2014-12-01

    Full Text Available The paper presents the structure of the benthonic macro-invertebrates communities in the Berzasca, Sirinia, Liubcova, and Mraconia rivers. The results are based on quantitative benthos samples (95 samples, collected in July 2014 from 19 sampling stations within the study area. In longitudinal profile, the benthonic macro-invertebrate communities of the Sirinia, Liubcova and Berzasca rivers displays relatively large structural variability, while the communities of the Mraconia River displays smaller structural variability. The structure of the benthonic macro-invertebrate communities correlated with the biotope characteristics indicates the good ecological status of the analysed rivers, with the exception of the Berzasca River sector downstream of the town of Berzasca and immediately upstream of the Danube junction, a sector with moderate ecological status due to negative effects from man-made modifications in the lotic biotope of the sector.

  15. Capturing the Turkish Fortress on Danube as the Decisive Factor in the Victory of Russia in the Russo-Turkish war of 1787-1791

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    Ivan Tatarinov

    2013-08-01

    Full Text Available During the Russian-Turkish war of 1787-1791 the fortress on the Danube were major military bases for the Turkish army. They are reliably protected the Balkans against the invading Russian troops. Based on studies of the memoirs of contemporaries and predecessors in this article refers to the importance of seizing the Turkish fortifications on the Danube in 1790. In addition, examined and identified the characteristics of each stage of the military campaign in 1790.

  16. Know-how from Austria for a hydroelectric power plant in Hungary. The Nagymaros power plant is under construction at the Danube river

    Energy Technology Data Exchange (ETDEWEB)

    Fremuth, W.

    1989-06-01

    In Hungary, a hydroelectric power plant is being constructed at the Danube river and is planned to be operated by the CSSR and Hungary. The project management is an Austrian company, Donaukraft, who thus inverts its know-how in hydroelectric power plant construction. The plant is planned to be ready for operation by 1994, and will stretch out over a distance of 180 kilometers along the Danube river, supplying about 171 MW of electricity. (orig.).

  17. Microsatellites variation in sterlet sturgeon, Acipenser ruthenus from the Lower Danube

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    Andreea Dudu

    2013-05-01

    Full Text Available Sturgeons represent an ancient group of fish with an important scientific and commercial value. The economical significance of these species is due to their meat and roes that are considered to be a gastronomic delicacy. Unfortunately, precisely due to their economical value the sturgeons have been overexploited by fishing and poaching and nowadays are facing extinction. Currently, in the Ponto-Caspian region is found the greatest diversity of acipenserid species and the Lower Danube is the last refuge for the sturgeons from the Black Sea. Acipenser ruthenus (sterlet is a fresh water sturgeon species which has undergone a large population decline, but local populations are still surviving in most parts of the rivers draining to Black, Azov and Caspian Seas. In order to have successful conservation programs of this species is essential to evaluate its genetic diversity. Microsatellites represent valuable markers for genetic analyses aiming the assessment of genetic variability of population. In our study we analyzed the cross-amplification and the polymorphism in A. ruthenus population from the Lower Danube of seven microsatellite loci (LS-19, LS-34, LS-54, LS-57, LS-68, Aox23 and Aox45, originally isolated in North-American sturgeon species. Among the seven loci, three (LS57, Aox23 and Aox45 have showed a tetrasomic profile. The most polymorphic loci were LS-57 with 12 alleles in population, followed by Aox23 and Aox45 with 11 alleles and LS-68 with 10 alleles. Four loci (LS-19, LS-34 and LS-54 presented a lower level of polymorphism, only three alleles being identified for the analyzed individuals.

  18. RESEARCH REGARDING THE MELLIFEROUS CHARACTHERISTICS OF LABIATES FROM XEROPHILE MEADOWS FROM DANUBE VALLEY

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    NICOLETA ION

    2013-12-01

    Full Text Available The xerophile meadows in the Danube Valley are dry meadows, located at a great distance from the Danube and with underground waters at greater depth. Their floral composition is characterized by a small number of species pertaining to both mezoxerophiles and to xerophiles, yet the highest percentage is covered by xerophile species, which are characterized by their small foliage surface, the very narrow and tough limb, and acute porosity etc.In the floral composition of these species, the graminaceae species are best represented, followed by leguminous and lamiaceae, known in beekeeping as good honey plants. Thus, the researches carried out have shown that Lamiaceae species have a good participation, with variation limits raging from 15% to 50-60%. Leguminous species are represented less on xerophile meadows than in hidrophile meadows. Among these we mention: Lotus corniculatus L., Trifolium repens L. si Medicago lupulina L., all these species being known in beekeeping as good honey plants. Among gramineae species the most representatives are: Lolium perene L. and Poa pratensis L., yet with no melliferous value. Likewise, the group of „various” plants varied a lot as participation in the structure of the vegetal cover of xerophile meadows, depending on the place of research, all these species having no melliferous value. The current paper describes the results o biometric and melliferous researches carried out over the period 2003- 2005 on 5 plant species pertaining to the Lamiaceae family, namely: Salvia nemerosa L. – sage; Salvia pratensis L. – meadow sage; Marrubium vulgare L. – horehound;Lamium purpureum L. – purple deatnettle;Lamium amplexicaule L. – henbit deadnettle.

  19. Antibiotic resistance patterns of Pseudomonas spp. isolated from the River Danube

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    Clemens eKittinger

    2016-05-01

    Full Text Available Spread and persistence of antibiotic resistance pose a severe threat to human health, yet there is still lack of knowledge about reservoirs of antibiotic resistant bacteria in the environment. We took the opportunity of the Joint Danube Survey 3 (JDS3, the world's biggest river research expedition of its kind in 2013, to analyse samples originating from different sampling points along the whole length of the river. Due to its high clinical relevance, we concentrated on the characterization of Pseudomonas spp. and evaluated the resistance profiles of Pseudomonas spp. which were isolated from eight sampling points. In total, 520 Pseudomonas isolates were found, 344 (66.0% isolates were identified as Pseudomonas putida, and 141 (27.1% as Pseudomonas fluorescens, all other Pseudomonas species were represented by less than five isolates, among those two P. aeruginosa isolates. Thirty seven percent (37% of all isolated Pseudomonas species showed resistance to at least one out of eleven tested antibiotics. The most common resistance was against meropenem (30.4% / 158 isolates piperacillin/tazobactam (10.6% / 55 isolates and ceftazidime (4.2% / 22 isolates. 16 isolates (3.1% / 16 isolates were multi-resistant. For each tested antibiotic at least one resistant isolate could be detected. Sampling points from the upper stretch of the River Danube showed more resistant isolates than downriver. Our results suggest that antibiotic resistance can be acquired by and persists even in Pseudomonas species that are normally not in direct contact with humans. A possible scenario is that these bacteria provide a reservoir of antibiotic resistance genes that can spread to related human pathogens by horizontal gene transfer.

  20. The European Union strategy for the Danube – Preliminaries, mechanisms, positions, priorities and effects

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    Emilian M. DOBRESCU

    2011-06-01

    Full Text Available The European Union Strategy for the Danube is an internal EU strategy where all river-side countries are invited to take part, complying with the three principles applied also in the case of the EU Strategy for the Baltic Sea Region.The three pillars proposed by the European Commission and which the Strategy centers round are: connectivity (transport, energy, telecommunication, environmental protection and water management, as well as the socio-economic development (culture, education, tourism, rural development. The European Commission proposed to launch and organize a public debate in all river-side countries, conferences, seminars and round tables. The outcome of these debates will lie in the European Commission working out and bringing up, together with the river states, a paper on the theme of the EU Strategy for the Danube Region, and also a Plan of Action. This will comprise the detailed analysis of the present state and will propose a list of strategic projects. The implementation of the Plan of Action will be monitored by the European Commission and will be periodically up-dated, according to the economic conditions and the social trends in the region. Classification-JEL:N5; N7; Q4; R4Keywords:strategy, connectivity, environmental protection, water management, socio-economic development, sustainable developmentJournal:Romanian Journal of EconomicsPages:169-190Volume:32Issue:1(41Year:2011(XXIMonth: JuneFile-URL: http://www.revecon.ro/articles/2011-1/2011-1-10.pdfFile-Format: Application/pdfHandle: RePEc:ine:journl:v:1:y:2011:i:41:p:169-190

  1. Joint modelling of flood peaks and volumes: A copula application for the Danube River

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    Papaioannou George

    2016-12-01

    Full Text Available Flood frequency analysis is usually performed as a univariate analysis of flood peaks using a suitable theoretical probability distribution of the annual maximum flood peaks or peak over threshold values. However, other flood attributes, such as flood volume and duration, are necessary for the design of hydrotechnical projects, too. In this study, the suitability of various copula families for a bivariate analysis of peak discharges and flood volumes has been tested. Streamflow data from selected gauging stations along the whole Danube River have been used. Kendall’s rank correlation coefficient (tau quantifies the dependence between flood peak discharge and flood volume settings. The methodology is applied to two different data samples: 1 annual maximum flood (AMF peaks combined with annual maximum flow volumes of fixed durations at 5, 10, 15, 20, 25, 30 and 60 days, respectively (which can be regarded as a regime analysis of the dependence between the extremes of both variables in a given year, and 2 annual maximum flood (AMF peaks with corresponding flood volumes (which is a typical choice for engineering studies. The bivariate modelling of the extracted peak discharge - flood volume couples is achieved with the use of the Ali-Mikhail-Haq (AMH, Clayton, Frank, Joe, Gumbel, Hüsler-Reiss, Galambos, Tawn, Normal, Plackett and FGM copula families. Scatterplots of the observed and simulated peak discharge - flood volume pairs and goodness-of-fit tests have been used to assess the overall applicability of the copulas as well as observing any changes in suitable models along the Danube River. The results indicate that for the second data sampling method, almost all of the considered Archimedean class copula families perform better than the other copula families selected for this study, and that for the first method, only the upper-tail-flat copulas excel (except for the AMH copula due to its inability to model stronger relationships.

  2. Explanatory Factors of the Expansion of Recreation Function on the Bank of Danube River in Budapest

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    Pál Szabó

    2015-10-01

    Full Text Available In a city's development a river and riverbank played important role, however in recent decades the functions of them have changed, transformed, especially in major cities in the more developed countries, so the city administration was faced with a new phenomenon and geographical space: the changing riverbanks, and the utilization, development, revitalization of them has become a key issue. The various real processes showed the direction that these areas should be provided to the people, and the recreation service will be important for the local residents and tourists. Overall, the urban waterfront development is an increasingly important researched topic and policy. The question is: can we realize it in Budapest also nowadays? In recent years, those processes took place in Budapest, which resulted in an increasing utilization of the Danube and its banks for recreational functions. On the one hand, local social and economic processes have led to the waterfront sites released, on the other hand the needs of the residential population and tourists using the river and the riverside for recreational purposes have increased, and thirdly, the new city administration decided to renew the banks of the Danube, mainly to create new recreational areas. In this paper, we analyze these three factors, focusing on a past short period, because there is an exceptional cohesion between the processes, the needs and the new development goals. Two case studies are in the paper also: the Margaret Island as the oldest traditional recreational area in Budapest, and the Kopaszi-dam, as the newest and successful recreational area of Budapest. The analysis of the processes is based on data and literature, the analysis of the needs is based on a survey, and the analysis of the goals is based on the different development documents.

  3. Hiatus in global warming - example of water temperature of the Danube River at Bogojevo gauge (Serbia

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    Ducić Vladan

    2015-01-01

    Full Text Available The research included trends in water temperature of the Danube River at Bogojevo gauge and surface air temperature at the nearby meteorological station Sombor, as well as an analysis of the results obtained in relation to the claims of the existence of the hiatus in global air temperature increase in the period 1998-2012. In the period 1961-2013, there was a statistically significant increase in the mean annual water temperature (0.039°C/year, as well as all the average monthly values. However, with annual values for the period 1998-2013, there was a decrease. The longest periods of negative trend (27 years were recorded for January and February. A high correlation was found between the surface air temperature and water temperature for all monthly and seasonal values. In the mean annual air temperature the presence of the hiatus is not observed, but a negative trend is recorded in March (32 years, December (43 years and February (49 years. The highest correlations between water temperature and North Atlantic Oscillation (NAO, Arctic Oscillation (AO and Atlantic Multidecadal Oscillation (AMO were obtained for the NAO in January (0.60, the AMO in autumn (0.52 and the NAO in winter (0.51. For surface air temperature, the highest correlations were registered for the AMO in summer (0.49 and the NAO in winter (0.42. The results indicate the dominant role of natural factors in the decrease of winter air temperature and water temperature of the Danube. [Projekat Ministarstva nauke Republike Srbije, br. III47007

  4. Modelling extraordinary floods and sedimentological processes in a large channel-floodplain system of the Lower Paraná River (Argentina)

    Institute of Scientific and Technical Information of China (English)

    Marina L. Garcia; Pedro A. Basile; Gerardo A. Riccardi; José F. Rodriguez

    2015-01-01

    abstract A quasi-2D unsteady flow and sediment transport model suitable for the simulation of large lowland river systems, including their floodplains, is presented. The water flow and sediment equations are discretised using an interconnected irregular cells scheme, in which different simplifications of the 1D de Saint Venant equations are used to define the discharge laws between cells. Spatially-distributed transport and deposition of fine sediments throughout the river-floodplain system are simulated. The model is applied over a 208-km reach of the Paraná River between the cities of Diamante and Ramallo (Argentina) comprising a river-floodplain area of 8100 km². After calibration and validation, the model is applied to predict water and sediment dynamics during synthetically generated extraordinary floods of 100, 1000, and 10,000 years return period. The potential impact of a 56-km long road embankment constructed across the entire floodplain is simulated and compared to model results without the embankment. The embankment results in increases in upstream water levels, inundation extent, flow duration, and sediment deposition.

  5. Education and Training Needs in the Field of Agriculture and Rural Development in the Lower Danube Region

    OpenAIRE

    Nicolae Istudor; Margarita Bogdanova; Victor Manole; Raluca Ignat; Irina Elena Petrescu

    2010-01-01

    Given the conditions of European Strategy for Labour which was ratified also by Romania, that states an intensifying implementation at national level of labour policies and especially those regarding young person labour market integration, and taking into consideration the great human and agricultural potential of Lower Danube Region, we consider the implementation of national and regional programmes in order to train agriculture and rural development specialists to be very necessary. This ar...

  6. ROMANIA AND SUSTAINABLE DEVELOPMENT. THE STATE OF FACT AND THE DANUBE RIVER AS A KEY-ELEMENT

    Directory of Open Access Journals (Sweden)

    BACIU Adrian

    2010-07-01

    Full Text Available This paper is focused on the evolution of economic and social situation in Romania in 1990-2007, and after that it is focalized upon possible paths to follow in order to provide a sustainable development in this geographical area, taking account of the way Romanian society and the political leadership could use the huge potential given by Danube river in order to attain this objective.

  7. Isochron burial dating of the Haslau terrace of the Danube (Vienna Basin) and interlaboratory comparison of sample preparation in Vienna and Budapest

    Science.gov (United States)

    Ruszkiczay-Rüdiger, Zsófia; Neuhuber, Stephanie; Decker, Kurt; Braucher, Régis; Fiebig, Marcus; Braun, Mihály; Lachner, Johannes; Aster Team

    2017-04-01

    In the Vienna Basin, terraces to the South of the Danube form a staircase with altitudes ranging between 25 and 130 m above current water level. The terrace system has been strongly dissected by faults related to the sinistral movement of the Vienna Basin Transform Fault System [1, 2]. Although each fault block displays a slightly different succession of terraces, fault-related vertical displacements south of the Danube have not yet been quantified. To better understand the Quaternary terrace sequence and its displacement along a fault segment south of the Danube, the isochron burial dating method [3] based on the 26Al and 10Be cosmogenic nuclide pair has been used on a terrace at Haslau an der Donau (˜40 m above river level). This terrace is locally the lowest of a staircase of a total of 6 different levels. Based on geomorphological mapping, its age was considered to be Middle Pleistocene [4]. The sample set consisted of several quartzite cobbles taken from two sedimentary units (5.5 m and 11.8 m depth) separated by an erosional hiatus of unknown duration. Six cobbles were selected for inter-laboratory comparison and processed at both the Cosmogenic Nuclide Sample Preparation Laboratory at Vienna and at Budapest [5]. AMS measurements were performed at the French national facility ASTER (CEREGE, Aix-en-Provence) and at the Vienna Environmental Research Accelerator (VERA). Initially, the obtained results show that the 10Be and 26Al concentrations calculated from the subsamples processed independently using different extraction schemes at both laboratories overlap within error for all subsamples but one, whose 26Al concentrations were significantly different. The low 26Al concentration measured in one Budapest sample probably resulted from Al having been trapped within the insoluble residues observed after evaporation to dryness. A modification of the sample processing allows overcoming this difficulty while treating for the following sample set. The results

  8. Morphometric analyze for flood hazard map using DTM built with LIDAR and Echo-sounder data in Danube Delta

    Science.gov (United States)

    Constantinescu, A.; Nichersu, I.; Trifanov, C.; Nichersu, I.; Mierla, M.

    2012-04-01

    High definition morphometric data acquired with a multibeam sonar is used to develop studies of past and future riverbed and shores dynamics on the Lower Danube at two bifurcations, one upstream from Tulcea city (Ceatal Ismail) and one downstream from Tulcea City (Ceatal Sf. Gheorghe). These studies help in understanding the tendency of the evolution of the Danube Delta in terms of river morphology, discharges, sediments and navigation between the three main branches which are: Chilia with an average flow of 60%, Sulina with an average flow of 18% and Sf. Gheorghe with an average flow of 22%. The most significant issue is the erosion of the shores of Pătlăgeanca town which represents the 1st bifurcation (Ceatal Izmail). Another intriguing issue is the presence of a current diversion dike located at the first bifurcation, the studies and models will show its importance and impact on the river morphology and biodiversity. Historical maps are used to determine the initial state of the area and will allow analyses of various types. Back in 2010 there was a high flooding in this area and 6 km downstream on Chilia branch the water broke the right side (Romanian side) dyke where used to be an old channel and flooded a 4570 Ha agricultural polder called Sireasa. It is imperative to know if the route of that flooding can shape the 4th branch of the Danube Delta. The dykes that are protecting the villages and the agricultural polders in this area are over raised but they are still in danger because they can still be flooded through infiltrations or from behind the dyke through upstream flooded polders. The situation in which the current diversion dyke is modified by increasing its length towards the downstream (act already happened), the shores from downstream and of Pătlăgeanca village will utterly alterate the river morphology, discharges, quantity of sediments and navigation in the whole Danube Delta. The resulted high definition data aquired with a multibeam sonar

  9. ORGANOCHLORINE PESTICIDES IN FISH OF THE KILIYA DELTA OF THE DANUBE (2003–2005

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    Yu. Sytnik

    2015-09-01

    Full Text Available Purpose. Identification and analysis of the content of organochlorine pesticides (OCP in organs and tissues of benthivorous and predatory fish species of the Kiliya delta of the Danube (Eastern mouth and their comparison with previous years. Methodology. The analysis of the samples of aquatic organisms for the content of residual organochlorine pesticides was carried out by gas-liquid chromatography (GLH based on a unified methodology. The chromatographic analysis was carried out on the gas chromatograph "Color 5" with electron capture detector at the Institute of Hydrobiology of the National Academy of Sciences of Ukraine. Findings. The effect of stable organochlorine pesticides on aquatic organisms is characterized by marked persistence in the environment and by high ability for migration and accumulation on different levels of food chains in aquatic ecosystems. The continuous presence of OCP in all investigated organs and tissues of selected species with the presence of a certain amount of fat and consequently, the fixation of residual organochlorine pesticides. Among benthivorous fishes, the content of OCP in organs and tissues (total is as follows: vimba → roach → wild carp → bream → gibel carp. Among the predators: asp → perch → European catfish → pikeperch. Originality. Recently, a significant number of scientists all around the world returns to the problem of the accumulation and distribution (redistribution of OCP in the components of aquatic ecosystems. This is associated with certain threats to the environment and human health, that could lead to negative consequences as a result of the consumption of fish as the highest trophic level in fresh waters of Ukraine. Practical value. The obtained data indicate that the major commercial fish species of the Kiliya delta of the Danube river contains residual quantities of pesticides. This indicates to the need for continuous hygienic and toxicological monitoring of fish caught

  10. Impacts of climate change on ecologically relevant river flow characteristics in the Danube river catchment

    Science.gov (United States)

    Stagl, Judith; Hattermann, Fred F.

    2014-05-01

    River flow characteristics reflecting flow seasonality and variability such as low and high flow durations play an important role for aquatic, wetland and riparian ecosystems. Climate change might not only alter long term average flows, but also affect the hydrologic regime on smaller scales. The Indicators of Hydrological Alteration (IHA) statistics (Richter et al. 1996) characterize changes in hydrologic regime by using a suite of ecologically relevant indicators given a daily discharge time series. Eco-hydrological indicators are applied to bridge the communication gap that exists between professionals in the fields of hydrology and ecology. Such indicators can help to synthesize complex hydrological variables into ecologically-meaningful information. For this study the eco-hydrological watershed model SWIM was applied for the whole Danube river catchment using 1224 subbasins. The SWIM model (Soil and Water Integrated Model) is a continuous-time semi-distributed watershed model, which combines hydrological processes, vegetation, erosion and nutrient dynamics at the meso- to macroscale (Krysanova et al. 1998, 2000). As the Danube river basin is climatically heterogeneous, it is characterized by a changing-complex river runoff regime varying from nival regimes in the alpine parts to mainly rain feed regimes in the lowlands. To account for these different river regimes of the Danubian tributaries, the SWIM model was calibrated separately for the major river subbasins. After calibration and validation of the model, this study uses a set of 14 high-resolution climate change projections performed by several state-of-art GCMs and RCMs, all based on the IPCC-SRES-A1B emission scenario, from the ENSEMBLES project (EU FP6). They serve as meteorological drivers for the SWIM model to simulate future daily time series of river discharge under different scenario conditions. The derived hydrologic data series then were statistically analyzed by using selected eco

  11. Foundation works for construction of Danube Bridge II Vidin (Bulgaria)-Calafat (Romania); Puente internacional sobre el rio Danubio entre las localidades de Vidin (Bulgaria) y Calafat (Rumania)

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Martin, J.

    2011-07-01

    The Foundations works of the bridge over the the Danube River II has involved a new technical challenge due to the cathartics of depth and diameter of the piles, and the logistical and human, due to the hard environmental conditions for the execution. This work, awarded to FCC. Construction company in its two contracts. Access to the bridge and Main Bridge has required on the differenced sites, the use of a wide range of foundation systems, since driven precast piles to in in situ pile with permanent casing, installed by vibrating systems and excavated with benoto grabs systems. The enormous responsibility of this phase is evident in the intense camping of characterization tests with static load tests, dynamic and Osterberg cells, as well as control the campaign with Cross-hole tests in 100% of the piles in situ executed, that has allowed no only ensure the highest level of quality on the foundation elements, but also to take the most of the mechanical characteristics of soils provided. The complexity of the execution of more than 24,000 ml pile executed along the more than 2 years duration of the work reach the maximum expression in the more than 6,900 ml of in situ pile made from marine resources, with a maximum depths up to 80 m with 2 m diameter pile. The article intends to give an overview of the site and the execution, associating the different foundation methods used, and the problems that were detected. (Author)

  12. " Using the impact model in order to predict the Danube river flow in the last quarter of the XXI century

    Science.gov (United States)

    Adamovic, M.

    2009-04-01

    The paper has intercompared and verified Regional Climate Model (RCM) EBU-POM in its representation of the hydrological balance over the Danube river basin along Iron Gate gorge, for the time frame 1961-1990 and 2071-2100 according to the IPCC SRES scenario A1B. The Danube has been chosen as a case study because of its multiple relevance for socioeconomical, as well as environmental and climatic level. This part of the Danube river basin has a direct relevance to the Mediterranean region, since it provides a relevant input of freshwater to the sea, as well as being fuelled mostly by precipitations due to the water of Mediterranean origin. On the other, the Dinaric-Balkan mountain chains in the west and the Carpathian mountain bow in the north and east, present distinctive morphological and climatic regions and barriers. Having been aware of the climatic-hydrologic and hydrographic homogeneity of regions, the whole territory of Serbia is divided into 20 units basins. The part of Danube basin in its eastern part present one of them, and was subject of the research. For this balance unit, the main components of the balance equation of the water that included into the calculation are: precipitation P (mm), flow Q (m3/s), runoff depth h (mm), evaporation E (mm) and annual air temperature T (0C). The hydrological balance has been computed in two different, but in principle equivalent ways. The first approach, which has a more hydrological nuance, relies on establishing relationships between annual averages of the hydrological balance parameters (E, P, T) in order to get relevant coefficients. The second approach, which is more typically meteorological, relies on the calculation of the E for the time frame 2071-2100 by using the previous coefficients. On the basis of the assessment of climate parameters in the XXI century and with help of the established relationships, the water flow of Danube river and runoff depth were defined for this century. The outcomes are very

  13. Aquatic macrophytes as indicators of heavy metal pollution of water in DTD canal system

    OpenAIRE

    Pajević Slobodanka P.; Vučković Mirjana S.; Kevrešan Žarko S.; Matavulj Milan N.; Radulović Snežana B.; Radnović Dragan V.

    2003-01-01

    The aim of this investigation was to establish the presence or absence of chemical contamination of water and the littoral zone (banks) of Danube-Tisza-Danube (DTD) canal system. The investigation covered the canal section from Bezdan to Prigrevica. By analyzing the chemical composition of dominant aquatic species in four locations of the section, we defined the species with the highest capacity to accumulate nutrients and heavy metals. Concentrations of P and K as well as of a beneficial ele...

  14. New data on sterlet (Acipenser ruthenus L. genetic diversity in the middle and Lower Danube sections, based on mitochondrial DNA analyses

    Directory of Open Access Journals (Sweden)

    Cvijanović Gorčin

    2015-01-01

    Full Text Available Poor regulated fishery, pollution, fragmentation and loss of habitat are most important factors influencing decline of sterlet population worldwide. In Middle and Lower Danube region, this species still have significant economic importance since wilde populations are commercially exploited, while Upper Danube populations are dependent on stocking efforts in order to maintain their presence in open waters. Aim of present study is to analyze genetic diversity of sterlet populations from the Middle and Lower Danube and Lower Tisza rivers, as a prerequisite for their effective conservation and management. Analysis of a highly variable D-loop fragment of mitochondrial DNA detected five new haplotypes, while the eight previously identified haplotypes had extended their previous range. Genetic variability could be attributed almost entirely to individuals, with observed lack of population structure. Negative values of neutrality test indicate recent expansion on some sampling locations. Adittionaly, gene flow analysis between Lower and Middle Danube region showed intensive exchange of speciemens. At the same time analysis showed some influence of Tisza dam on gene flow between samples from Tisza and Middle Danube section.Our study indicated the need for a careful planning of sterlet stocking programmes and inclusion of demographic data or catch time-series. [Projekat Ministarstva nauke Republike Srbije, br. 173045

  15. THE INFLUENCE OF FLUVIAL DYNAMICS ON GEOARCHAEOSITES FROM THE DANUBE BANK (THE MĂCIN BRANCH. CASE STUDY: TROESMIS FORTRESS (ROMANIA

    Directory of Open Access Journals (Sweden)

    Ionela Georgiana GAVRILĂ

    2012-03-01

    Full Text Available The influence of fluvial dynamics on geoarchaeosites from the Danube Bank (the Măcin Branch. Case study: Troesmis Fortress (Romania. Built since the first century AD, the fortresses along the right bank of the Danube river have suffered decay along the ages as a result of anthropic and geomorphological factors (weathering of construction rocks, fluvial and eolian erosion. Therefore, in order to study the evolution of the sites, analysis of the geological, geomorphological, hydrological and climatic conditions were made. Our study aims to analyze the Troesmis Geto-Dacian site (III - IV century AD situated on the right bank of the Măcin Branch. Nowadays, the fortress stage of degradation is quite advanced, the main natural decay favouring factor being lateral erosion from the Danube. Fluvial erosion and associated geomorphological processes have determined the retreat of the right bank of the Danube, which led to the structural destruction of the archaeological sites. In order to determine the fluvial dynamics of the Măcin Branch sector, bibliographic materials (maps from different time periods etc were analyzed and field observations were made. The result consisted mainly in the creation of maps that presents the dynamic of the Măcin Branch (Danube and its influence on the Troesmis geoarchaeosite.

  16. The Role of Media in Social Integration within the Danube Region

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    Yoanna Pankova

    2014-08-01

    Full Text Available This work analyses the importance of media as a perpetrator, influencing the pace of social integration. The article explores the differentiation in the way various media present events and the power of its influence. Prior Work: Study of Social integration, Approach: Survey among various media and its impact, Results: The results of the research show that the role of media is crucial for the subsequent attitude of citizens of the Danube region. It depends on the minimized or exaggerated impact of various issues, presented by it. The news media, as a global informative actor in shaping citizen`s acquaintance on various topics, is crucial player in the process of integration. Implications: The significance of media`s influence is effecting not only the attitude of citizens but also the tourism development. Value: With the emergence of printing and broadcasting media, their impact on the fulfilment of social unity is constantly emerging. Due to that fact it is necessary to explore the various types of media and their influence.

  17. Biostratigraphy, sedimentology and paleoenvironments of the northern Danube Basin: Ratkovce 1 well case study

    Directory of Open Access Journals (Sweden)

    Rybár Samuel

    2015-02-01

    Full Text Available The Ratkovce 1 well, drilled in the Blatné depocenter of the northern Danube Basin penetrated the Miocene sedimentary record with a total thickness of 2000 m. Biostratigraphically, the NN4, NN5 and NN6 Zones of calcareous nannoplankton were documented; CPN7 and CPN8 foraminifer Zones (N9, 10, 11 of the global foraminiferal zonation; and MMi4a; MMi5 and MMi6 of the Mediterranean foraminiferal zonation were recognized. Sedimentology was based on description of well core material, and together with SP and RT logs, used to characterize paleoenvironmental conditions of the deposition. Five sedimentary facies were reconstructed: (1 fan-delta to onshore environment which developed during the Lower Badenian; (2 followed by the Lower Badenian proximal slope gravity currents sediments; (3 distal slope turbidites were deposited in the Lower and Upper Badenian; (4 at the very end of the Upper Badenian and during the Sarmatian a coastal plain of normal marine to brackish environment developed; (5 sedimentation finished with the Pannonian-Pliocene shallow lacustrine to alluvial plain deposits. The provenance analysis records that the sediment of the well-cores was derived from crystalline basement granitoides and gneisses and from the Permian to Lower Cretaceous sedimentary cover and nappe units of the Western Carpathians and the Eastern Alps. Moreover, the Lower Badenian volcanism was an important source of sediments in the lower part of the sequence.

  18. Avian Influenza Surveillance in the Danube Delta Using Sentinel Geese and Ducks

    Science.gov (United States)

    Maftei, Daniel Narcis; Chereches, Razvan M.; Bria, Paul; Dragnea, Claudiu; McKenzie, Pamela P.; Valentine, Marissa A.; Gray, Gregory C.

    2014-01-01

    Highly pathogenic avian influenza (HPAI) H5N1 virus incursions from migrating birds have occurred multiple times in Romania since 2005. Beginning in September 2008 through April 2013, seasonal sentinel surveillance for avian influenza A viruses (AIVs) using domestic geese (Anser cygnoides) and ducks (Anas platyrhynchos) in the Danube Delta was established by placing 15 geese and 5 ducks at seven sites. Tracheal and cloacal swabs, and sera collections (starting in 2009) were taken monthly. We studied a total of 580 domestic birds and collected 5,520 cloacal and tracheal swabs from each and 2,760 sera samples. All swabs were studied with real-time reverse transcription polymerase chain reaction (rRT-PCR) for evidence of AIV. Serological samples were studied with hemagglutination inhibition assays against avian H5, H7, and H9 influenza viruses. From 2009 to 2013, 47 swab specimens from Cot Candura, Enisala, and Saon screened positive for AIV; further subtyping demonstrated that 14 ducks and 20 geese had cloacal evidence of H5N3 carriage. Correspondingly, 4 to 12 weeks after these molecular detections, sentinel bird sera revealed elevated HI titers against H5 virus antigens. We posit that domestic bird surveillance is an effective method to conduct AIV surveillance among migrating birds in delta areas. PMID:24795823

  19. Continental water storage inferred from 3-D GPS coordinates in Danube Basin

    Science.gov (United States)

    van Dam, T. M.; Wang, L.; Weigelt, M. L. B.; Tourian, M. J.; Chen, Q.; Sneeuw, N. J.

    2014-12-01

    GPS coordinates time series contain viable information about continental water storage (CWS) at global and regional scale. The permanent GPS network of GPS stations around the Earth recorded more than 15 years of data, which comprise the elastic response of the bed rock movements induced by mass loading. The inversion of the observed displacements, yields mass variations which can be interpreted as CWS under the condition that no other mass loading is interfering. GPS-derived CWS offers complimentary information to the widely used CWS determination by GRACE but is also able to mitigate a possible loss of data in case the GRACE mission ends before the launch of the GRACE Follow-On mission. GPS also allows increasing the temporal resolution (weekly from GPS versus monthly from GRACE) and the spatial resolution (especially in the regions with dense GPS networks). Here, we determine the weekly mass variations from GPS 3-D coordinates by using mass-loading Green's function in six Danube sub-basins. The results are validated against GRACE and hydro-meteorological models. We also demonstrate the contribution of GPS horizontals for regional water storage and provide insights into the benefits and limitations of 3-D GPS inversions for regional water storage.

  20. Laboratory Performance Testing of Two Types of Geotextiles used in Danube Hydrotechnical Works

    Science.gov (United States)

    Dumitru, F. D.; Moncea, M. A.; Panait, A. M.; Olteanu, M.; Laslo, L.

    2017-06-01

    The products included in the geosynthetic category (geotextiles, geogrids, geonets, geomembranes, geosynthetic clay liners, geofoam, geocells (cellular confinement) and geocomposites) have multiple civil engineering uses, being effectively used as drains and filters in civil and environmental works. The paper aims to test the performance of the geotextiles used for the ecological restoration of riverbank defences on the Danube River, between Calarasi and Braila. For this purpose, the analysed geosynthetics were subjected to hydrolysis and oxidation degradation in laboratory conditions. To evaluate the effect of the two degradation mechanisms, the specimens were subjected to tensile tests at room temperature. The three analysed parameters were tensile strength, elongation and failure mode. The results showed that the tensile strength values for the samples subjected to oxidation and hydrolysis are lower than the ones corresponding to the reference samples, while the elongation values determined after mechanical testing showed that hydrolysis influences the fibre flexibility. The failure mode of the analysed geotextiles highlighted the tendency of the samples to fail either in the calibrated area or at the grip, indicating that in use the geotextile will break in the strained region.

  1. Land Cover Changes (1963–2010 and Their Environmental Factors in the Upper Danube Floodplain

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    Fang Xu

    2017-06-01

    Full Text Available To analyze the changes in the Upper Danube Floodplain, we used aerial photos to quantify the change of landscape pattern from 1963 to 2010. We focused on typical floodplain habitats, i.e., riparian forest and floodplain grassland. We used landscape metrics and transformation matrix to explore changes in land cover structure and composition. The active floodplain experienced increasing fragmentation from 1963 to 2010. Despite an increase of aggregation, riparian forest suffered a 2.3% area loss from 1995 to 2010. Arable land in the active floodplain declined by 28.5%, while its patch size significantly increased. Elevation, distance to river and soil quality were the most relevant environmental factors for the land cover change in the floodplain. Higher soil quality or longer distance to river led to an increase of conversion from grassland into arable land; grassland patches with poorer soil quality were likely to change into riparian forest; riparian forest closer to the river and with a lower height above mean water level tended to remain stable. This comprehensive understanding of historical land cover change and environmental factors is needed for the enhancement of landscape functions and sustainable development in the floodplain.

  2. The first comprehensive estimate of the winter population of the White-tailed Eagle Haliaeetus albicilla along the Danube/ Prva celostna ocena zimske populacije belorepca Haliaeetus albicilla vzdolž Donave

    Directory of Open Access Journals (Sweden)

    Probst Remo

    2014-12-01

    Full Text Available In January 2014, the first ever comprehensive winter census of the Whitetailed Eagle Haliaeetus albicilla along the Danube River was conducted, using mostly point and transect counts. Altogether, 550-700 eagles were counted. The upper range of the estimate may in fact be more realistic because 615 km of the Danube were not surveyed. Birds were observed in every country along the Danube. Hotspots of occurrences were (1 the Central Danube floodplains - the area encompassing the lower Hungarian section (Danube- Drava National Park, Kopački rit Nature Park (Croatia, and the Gornje Podunavlje Special Nature Reserve (Serbia; and (2 the Danube Delta Biosphere Reserve. According to the Action Plan for the conservation of the White-tailed Eagle along the Danube, future winter counts should be made regularly, and lower variation in the resulting eagle numbers achieved by a higher degree of synchronization between individual countries. This study reinforces the importance of protected areas along the Danube as a backbone for the conservation of White-tailed Eagles and biodiversity.

  3. Dominant events in the northern Danube Basin palaeogeography – a tool for specification of the Upper Miocene and Pliocene stratigraphy

    Directory of Open Access Journals (Sweden)

    Peter Joniak

    2010-01-01

    Full Text Available Late Neogene palaeogeography and geodynamics of the Danube Basin is characterized by wide rifting of the back arc basin, its gradual infill, followed by the Pliocene uplift and denudation. Basin development is well recorded in its sedimentary succession, where three 3rd order sequence stratigraphy cycles were documented. DB1 cycle comprising the Lower and Middle Pannonian sediments (A – E zones sensu Papp, 1951 deposited in time span 11.6 – (9.7? 8.9 Ma is represented in Slovakia by the Ivanka and Beladice formations, in Hungary (where the formations are defined as appearance of sedimentary facies in time and space the equivalents are: deepwater setting marls, clays and sandy turbidites of the Endrőd and Szolnok formations, towards overlying strata by deposits of the basin palaeoslope or delta-slope represented by the Algyő Formation and the final shallow water setting deposits of marches, lagoons, coastal and delta plain built up by clays, sands with coal seams, represented by the Újfalu Formation. DB2 cycle comprises the Upper Pannonian sediments of the Danube Basin (F, G & H zones sensu Papp, 1951 deposited in time span (9.7? 8.9 – 6.3? Ma and is represented by the uppermost part of the Beladice and Volkovce formations, in Hungary by the Zagyva Formation. Sedimentary environment can be characterized as alluvial – with wide range of facies – from fluvial, deltaic, ephemeral lake to marches and dry land deposits. DB3 cycle comprises the Pliocene sediments of the Danube Basin Slovak part represented by the Kolárovo Formation, dated 4.1? – 2.6 Ma. The formation was deposited in fluvial to lake, and alluvial environment.

  4. Multiparametric monitoring of microbial faecal pollution reveals the dominance of human contamination along the whole Danube River.

    Science.gov (United States)

    Kirschner, A K T; Reischer, G H; Jakwerth, S; Savio, D; Ixenmaier, S; Toth, E; Sommer, R; Mach, R L; Linke, R; Eiler, A; Kolarevic, S; Farnleitner, A H

    2017-11-01

    The microbial faecal pollution of rivers has wide-ranging impacts on a variety of human activities that rely on appropriate river water quality. Thus, detailed knowledge of the extent and origin of microbial faecal pollution is crucial for watershed management activities to maintain safe water use. In this study, the microbial faecal pollution levels were monitored by standard faecal indicator bacteria (SFIB) along a 2580 km stretch of the Danube, the world's most international river, as well as the Danube's most important tributaries. To track the origin of faecal pollution, host-associated Bacteroidetes genetic faecal marker qPCR assays for different host groups were applied in concert with SFIB. The spatial resolution analysis was followed by a time resolution analysis of faecal pollution patterns over 1 year at three selected sites. In this way, a comprehensive faecal pollution map of the total length of the Danube was created, combining substantiated information on both the extent and origin of microbial faecal pollution. Within the environmental data matrix for the river, microbial faecal pollution constituted an independent component and did not cluster with any other measured environmental parameters. Generally, midstream samples representatively depicted the microbial pollution levels at the respective river sites. However, at a few, somewhat unexpected sites, high pollution levels occurred in the lateral zones of the river while the midstream zone had good water quality. Human faecal pollution was demonstrated as the primary pollution source along the whole river, while animal faecal pollution was of minor importance. This study demonstrates that the application of host-associated genetic microbial source tracking markers in concert with the traditional concept of microbial faecal pollution monitoring based on SFIB significantly enhances the knowledge of the extent and origin of microbial faecal pollution patterns in large rivers. It constitutes a

  5. Body burden of pesticides and wastewater-derived pollutants on freshwater invertebrates: Method development and application in the Danube River.

    Science.gov (United States)

    Inostroza, Pedro A; Wicht, Anna-Jorina; Huber, Thomas; Nagy, Claudia; Brack, Werner; Krauss, Martin

    2016-07-01

    While environmental risk assessment is typically based on toxicant concentrations in water and/or sediment, awareness is increasing that internal concentrations or body burdens are the key to understand adverse effects in organisms. In order to link environmental micropollutants as causes of observed effects, there is an increasing demand for methods to analyse these chemicals in organisms. Here, a multi-target screening method based on pulverised liquid extraction (PuLE) and a modified QuEChERS approach with an additional hexane phase was developed. It is capable to extract and quantify organic micropollutants of diverse chemical classes in freshwater invertebrates. The method was tested on gammarids from the Danube River (within the Joint Danube Survey 3) and target compounds were analysed by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Furthermore, a non-target screening using high resolution-tandem mass spectrometry (LC-HRMS/MS) was conducted. A total of 17 pollutants were detected and/or quantified in gammarids at low concentrations. Pesticide concentrations ranged from 0.1 to 6.52 ng g(-1) (wet weight), those of wastewater-derived pollutants from 0.1 to 2.83 ng g(-1) (wet weight). The presence of wastewater-derived pollutants was prominent at all spots sampled. Using non-target screening, we could successfully identify several chlorinated compounds. These results demonstrate for the first time the presence of pesticides and wastewater-derived pollutants in invertebrates of the Danube River.

  6. DATOURWAY: Transnational Strategy for the Sustainable Territorial Development of the Danube Area with Special Regard to Tourism

    Directory of Open Access Journals (Sweden)

    Elena Stancu

    2014-09-01

    Full Text Available The article is a synthesis of the DATOURWAY project which is a part of South Est Europe Program (2009-2012 and represents “an outstanding example of transnational cooperation” between partners from seven countries, from which six countries are touched by the Danube River. The cooperation within the project was committed to the development of tourism along and on the middle and south-eastern section of river Danube, while paying particular attention to the protection and enhancement of the natural and cultural resources linked to this part of River. National Institute for Research and Development in Construction, Urban Planning and Sustainable Spatial Develoment ”URBAN-INCERC”, through “Urbanproiect Branch”, has been one of the Romanian partners in the DATOURWAY project, together with The National Institute for Research and Development in Tourism and the Ministry of Regional Development and Tourism. “URBANPROIECT” has mainly contributed to the National Analysis and Strategy concerning Romanian territory and two Pilot-Projects: PiP3 – “Vidin-Calafat” (Romania and Bulgaria regarding city tourism and rural neighborhood, and PiP4 – “Deltas” (Romania-Italy regarding eco-friendly tourism development of river Danube and Po deltas. The DATOURWAY project has been a “contribution to sustainable territorial development and has reflected a common strategic interest by setting a common future approach in the field of tourist development, focusing mainly on the rural areas, by elaborating a set of mutually agreed tourist strategies and implementing different pilot projects tailored to special areas”.

  7. Peasant Self-Government in the Ukrainian Danube Region (End of XIX - Early XX Century.: Social and Cultural Aspects

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    Irina Verkhovtseva

    2013-08-01

    Full Text Available The complex historical destiny of Ukrainian Danube region in the nineteenth century led to the fact that by the end of this century, in the counties of the region peasant self-government was organized in different ways: in Akkerman - according to the reform in 1868, carried out by the Russian authorities in Bessarabia, and in Ismail - in accordance with the reforms of 1864-1874 years conducted by the Romanian government. The author compares and analyzes the peasant self-government in the counties of the province in the context of its sociocultural development in the unfolding process of modernization of the late XIX - early XX centuries.

  8. Educating for action: Aligning skills with policies for sustainable development in the Danube river basin.

    Science.gov (United States)

    Irvine, Kenneth; Weigelhofer, Gabriele; Popescu, Ioana; Pfeiffer, Ellen; Păun, Andrei; Drobot, Radu; Gettel, Gretchen; Staska, Bernadette; Stanica, Adrian; Hein, Thomas; Habersack, Helmut

    2016-02-01

    Sustainable river basin management depends on knowledge, skills and education. The DANCERS project set out to identify feasible options for achieving education for sustainable water management across the Danube river basin, and its integration with broader education and economic development. The study traced the historic, regulatory and educational landscape of water management in the basin, contrasting it with the complex political decision-making, data-heavy decision support, learning-centred collaboration, and information-based participation that are all inherent components of Integrated Water Resource Management (IWRM). While there is a wide range of educational opportunities and mobility schemes available to individuals, there is no coherent network related to training in water management and sustainable development in the study region. Progress in addressing the multi-layered environmental challenges within the basin requires further aligning of economic, environmental and educational policies, advancing the EU Bologna Process across the region, and the development of dedicated training programmes that combine technical and relational skills. The DANCERS project identified key short and medium term needs for education and research to support progressive adoption of sustainable development, and the necessary dialogue across the public and private sectors to align policies. These include the development of new education networks for masters and PhD programmes, including joint programmes; improved access to technical training and life-long learning programmes for skills development; developing formalized and certified competency structures and associated accreditation of institutions where such skilled individuals work; and developing a co-ordinated research infrastructure and pan-basin programme for research for water management and sustainable development.

  9. Aspectos ecológicos de Diplectanum piscinarius (Platyhelminthes, Monogenea parasita de brânquias de Plagioscion squamosissimus (Osteichthyes, Sciaenidae da plan. inund. Alto rio Paraná, B - DOI: 10.4025/actascibiolsci.v27i3.1279 Ecological aspects of Diplectanum piscinarius (Platyhelminthes, Monogenea parasite of gills of Plagioscion squamosissimus (Osteichthyes, Sciaenidae in the Upper Paraná River floodplain, Brazil - DOI: 10.4025/actascibiolsci.v27i3.1279

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    Maria de Los Angeles Perez Lizama

    2005-03-01

    Full Text Available Trinta e nove espécimes de Plagioscion squamosissimus Heckel, 1840 foram coletados com redes de espera de diferentes malhagens na planície de inundação do Alto rio Paraná. Foi registrada a ocorrência de Diplectanum piscinarius Kritsky e Thatcher, 1984, que apresentou abundância média igual a 31, intensidade média 31,8 e prevalência 97%. Realizou-se uma análise ecológica de alguns aspectos da relação parasita-hospedeiro entre D. piscinarius e P. squamosissimus. Não houve diferenças significativas entre prevalência e intensidade de parasitismo em machos e fêmeas. Não houve correlações entre abundância e prevalência com o comprimento padrão dos hospedeiros e entre o fator de condição relativo com a abundância. Através dos resultados, é possível supor que, provavelmente, existem poucas diferenças fisiológicas e comportamentais entre hospedeiros machos e fêmeas, não ocorrem mudanças fisiológicas durante o desenvolvimento dos hospedeiros e o parasita exibe baixa patogenicidadeThirty-nine specimens of Plagioscion squamosissimus Heckel, 1840 were collected through nets of different mesh sizes in the Upper Paraná River floodplain. The occurrence of Diplectanum piscinarius Kritsky and Thatcher, 1984 was registered and it presented mean abundance of 31, mean intensity of 31.8 and prevalence of 97%. This paper also brings an ecological analysis of some aspects of the host-parasite relationship between D. piscinarius and P. squamosissimus. There were not significant differences between the prevalence and intensity of parasitism of males and females. There were not correlations between abundance and prevalence and the standard length of the hosts; and between relative condition factor (Kn and abundance. From the results it is possible to assume that there are few physiological and behavioral differences between male and female hosts. Physiological changes probably do not occur during the development of the hosts and

  10. Variação temporal de fatores limnológicos em ambientes da planície de inundação do alto rio Paraná (PR/MS – Brasil - DOI: 10.4025/actascibiolsci.v26i3.1538 Temporal variation of limnological factors in the Upper Paraná River floodplain habitats - DOI: 10.4025/actascibiolsci.v26i3.1538

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    Renata Ribeiro de Araujo Rocha

    2004-04-01

    Full Text Available A variação sazonal de variáveis limnológicas foi monitorada em quatro ambientes da planície de inundação do alto rio Paraná, entre os meses de março de 2000 e março de 2001. As variáveis mensuradas foram: temperatura, profundidade da coluna de água, transparência do disco de Secchi, pH, condutividade elétrica, alcalinidade total, turbidez, oxigênio dissolvido, material em suspensão total, N-nitrato, N-nitrito, N-amoniacal, nitrogênio total, fósforo reativo solúvel, fósforo dissolvido, fósforo total, carbono orgânico dissolvido e clorofila α. Durante a análise da variação sazonal das variáveis, foram considerados os registros de precipitação pluviométrica e dos níveis de água do rio Paraná. Os resultados indicaram ausência do efeito homogeneizador, como registrado em estudos anteriores na planície, ausência de sazonalidade para alguns fatores (e.g., condutividade e alcalinidade e forte influência da precipitação pluviométrica na dinâmica dos fatores limnológicos, em especial nos aportes de nutrientesThe seasonal variation of limnological variables was monitored in four habitats in the Upper Paraná River floodplain, from March 2000 to March 2001. The measured variables were temperature, depth, Secchi transparency, pH, electrical conductivity, total alkalinity, turbidity, dissolved oxygen, total suspended matter, nitrate-N, nitrite-N, ammoniac-N, total nitrogen, reactive soluble phosphorus, dissolved phosphorus, total phosphorus, dissolved organic carbon and chlorophyll α. During the seasonal variation, the pluviometric precipitation and water levels were also considered. The results indicated absence of homogenization, as detected in previous studies, absence of seasonality of some factors (e.g., conductivity and alkalinity, and a strong influence of the pluviometric precipitation upon the limnological factors dynamic, especially in the nutrient inputs

  11. The influence of parasitism on the relative condition factor (Kn of Metynnis lippincottianus (Characidae from two aquatic environments: the upper Parana river floodplain and Corvo and Guairacá rivers, Brazil = Influência do parasitismo sobre o fator de condição relativo (Kn de Metynnis lippincottianus em dois ecossistemas aquáticos: planície de inundação do alto rio Paraná e rios Corvo e Guairacá, Brasil

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    Luís Henrique de Aquino Moreira

    2010-01-01

    Full Text Available The study analyzed 84 specimens of Metynnis lippincottianus (Cope, 1870 (Characidae from two environments with different degrees of impact due to a hydroeletric plant; 44 hosts from the upper Parana river floodplain (low degree of impact and 40 from Paranapanema tributaries (Corvo and Guairacá rivers, high degree of impact. The prevalence found, among the total collected fishes, was 77.4%. One digenetic species, Dadayus pacupeva, and four nematodes, Spinoxyuris oxydoras, Contracaecum sp. (larval stage, Procamallanus (Spirocamallanus inopinatus and Raphidascaris (Sprentascaris mahnerti were identified. In the floodplain, the fishes parasitized by D. pacupeva and S. oxydoras presented better relative condition factor (Kn than non-parasitized species. Positive correlation between Kn and abundance of these parasites was found in the same area. In the tributaries, the Kn did not differ significantly between parasitized an non-parasitized fishes, not even correlation with abundance of any parasite found.Foram coletados 84 espécimes de Metynnis lippincottianus, peixe caracídeo, em dois ecossistemas com diferentes níveis de impacto, resultante da construção de usinas hidroelétricas; 44 hospedeiros na planície de inundação do alto rio Paraná (baixo impacto e 40 nos tributários do rio Paranapanema (rios Corvo e Guairacá com alto impacto. Foi encontrada prevalência parasitária de 77,4% no total de peixes coletados. Uma espécie de digenético: Dadayus pacupeva e quatro de nematoides: Spinoxyuris oxydoras, Contracaecum sp. (estágio larval, Procamallanus (Spirocamallanus inopinatus e Raphidascaris (Sprentascaris mahnerti foram identificadas. Na região da planície, os peixes parasitados por D. pacupeva e S. oxydoras apresentaram melhor fator de condição relativo (Kn quando comparado aos não-parasitados. Verificou-se correlação positiva entre o Kn e a abundância dos parasitos citados anteriormente na mesma região. Nos tributários, n

  12. Planning, architecture, seismic, construction and energy-related criteria for sustainable spatial development in the Danube Delta Biosphere Reserve area

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    Vasile Meiţă

    2014-09-01

    Full Text Available The Danube Delta Biosphere Reserve represents a complex of ecosystems embedding a biome that had been included on UNESCO World Heritage list due to its global environmental importance. The outstanding natural diversity, including ecosystems, habitats and species situated at the top of European and International conservation lists, is mixed with an equally rich and important cultural (ethnic and religious diversity of the human communities inhabiting the area. According to the guidelines of the Man and the Biosphere Programme of UNESCO, the biosphere reserves including human settlements should be managed such that they could constitute an example for what sustainable development means. Starting from the spatial dimension added to the traditional socioeconomic, ecological and cultural pillars of sustainable development, the paper examines planning, architecture, seismic, construction and energy-related criteria that could substantiate a sustainable development model applicable to the Danube Delta, and counter the effects of clime change in the area. The results suggest that the traditional practices of the inhabitants could offer sustainable solutions and help preserving the natural and cultural diversity of the region.

  13. Hydrological Cycle in the Danube basin in present-day and XXII century simulations by IPCCAR4 global climate models

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    Lucarini, Valerio; Kriegerova, Ida; Speranza, Antonio; 10.1029/2007JD009167

    2011-01-01

    We present an intercomparison and verification analysis of 20 GCMs included in the 4th IPCC assessment report regarding their representation of the hydrological cycle on the Danube river basin for 1961-2000 and for the 2161-2200 SRESA1B scenario runs. The basin-scale properties of the hydrological cycle are computed by spatially integrating the precipitation, evaporation, and runoff fields using the Voronoi-Thiessen tessellation formalism. The span of the model simulated mean annual water balances is of the same order of magnitude of the observed Danube discharge of the Delta; the true value is within the range simulated by the models. Some land components seem to have deficiencies since there are cases of violation of water conservation when annual means are considered. The overall performance and the degree of agreement of the GCMs are comparable to those of the RCMs analyzed in a previous work, in spite of the much higher resolution and common nesting of the RCMs. The reanalyses are shown to feature severa...

  14. The Annals of Braila - The Most Important Regional Culture Journal in the Interwar Period of the Lower Danube

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    Cristina Dosuleanu

    2011-12-01

    Full Text Available “The Annals of Braila” is one of the most important regional cultural journals published in the interwar period, due to the cultural phenomenon of regionalism. This was the response of Romanian intellectuals to the exaggerated influence of the West in all areas, that is the emergence of what Titu Maiorescu called forms without substance. As a result, immediately after the Great Union of 1918, young people, mostly students, who already exposed their ideas in scientific societies, began to organize information-gathering activities in all domains in certain areas and then they published them as scientific texts. That is how regional culture journals appeared in Craiova, Brasov, Timisoara and Constanta. Curiously, all have been mentioned in history books of press or in dictionaries except “The Annals of Braila”. A careful examination shows that the journal was probably not only a refuge, as the Braila journal was as important as the other. And in order to support this we should mention: it appeared for 12 years despite the financial difficulties, while others were released for a smaller period of time, it had as collaborators important people of the Romanian culture and literature, and its studies concerned the entire area of the Lower Danube, the analyzes, documents, information having considered other cities that are on the Danube shores. Therefore, we believe that the “Annals of Braila” journal must stand alongside the other regional culture journals and enjoy the same importance.

  15. The Danube so colourful: a potpourri of plastic litter outnumbers fish larvae in Europe's second largest river.

    Science.gov (United States)

    Lechner, Aaron; Keckeis, Hubert; Lumesberger-Loisl, Franz; Zens, Bernhard; Krusch, Reinhard; Tritthart, Michael; Glas, Martin; Schludermann, Elisabeth

    2014-05-01

    Previous studies on plastic pollution of aquatic ecosystems focused on the world's oceans. Large rivers as major pathways for land-based plastic litter, has received less attention so far. Here we report on plastic quantities in the Austrian Danube. A two year survey (2010, 2012) using stationary driftnets detected mean plastic abundance (n = 17,349; mean ± S.D: 316.8 ± 4664.6 items per 1000 m(-3)) and mass (4.8 ± 24.2 g per 1000 m(-3)) in the river to be higher than those of drifting larval fish (n = 24,049; 275.3 ± 745.0 individuals. 1000 m(-3) and 3.2 ± 8.6 g 1000 m(-3)). Industrial raw material (pellets, flakes and spherules) accounted for substantial parts (79.4%) of the plastic debris. The plastic input via the Danube into the Black Sea was estimated to 4.2 t per day.

  16. Concentrations of 17 elements in muscle, gills, liver and gonads of five economically important fish species from the Danube River

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    Lenhardt M.

    2013-01-01

    Full Text Available The Danube River in the vicinity of the city of Belgrade receives large amounts of untreated or poorly treated communal and industrial waste waters. The aim of this study was to assess elemental accumulation patterns in a number of economically important fish species in this area that belong to different trophic levels. Concentrations of 17 elements (Al, As, B, Ba, Cd, Co, Cr, Cu, Fe, Li, Mn, Mo, Ni, Pb, Se, Sr and Zn were assessed in liver, muscle, gills and gonads of silver carp (Hypophthalmichthys molitrix, freshwater bream (Abramis brama, white bream (Blicca bjoerkna, common carp (Cyprinus carpio and wels catfish (Silurus glanis from the Danube River in Serbia by the use of ICP-OES. Silver carp specimens were differentiated from the other four species by high concentrations of Al and Fe in the liver. Common carp specimens were differentiated by high concentrations of Zn in gills, muscle and liver. Distribution of elements among different tissues had a consistent pattern among the species. Concentrations of Pb, Cd, As, Zn, Cu and Fe in muscle were at acceptable levels for human consumption, while concentrations of Fe and Zn were above maximum acceptable concentrations in liver and gonads.

  17. Educational Tourism Movements in and the Danube Region of Fruška Gora – Condition and Development Perspectives

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    Jovan Romelic

    2008-01-01

    Full Text Available Northern slopes of Fruška gora near the Danube area comprise a variety of natural and anthropogenic objects, phenomena and processes. Thus, that area of the mountain has grown into a constituent part of the tourist region of Novi Sad and Fruška gora, which geographical position, structure and quality of tourist attractions and receptive base have contributed to its functionally versatile and comprehensive tourism spatial structure. A group of professors and associates from the Department of Geography, Tourism and Hotel Management, Novi Sad in cooperation with Tourist Organization of Sremski Karlovci have completed valorisation of this area regarding tourism by application of didactical-methodological approach. They concluded that the Danube basin near Fruška gora might become the location for various educational program's and training's, i.e. “lesson in thing” and educational tourism in broader sense. The paper discusses this hypothesis based upon interdisciplinary scientific and methodological approach to the problem.

  18. Long-term analysis of turbidity patterns in Danube Delta coastal area based on MODIS satellite data

    Science.gov (United States)

    Constantin, Sorin; Constantinescu, Ștefan; Doxaran, David

    2017-06-01

    The monitoring of coastal areas is becoming an urgent necessity in the context of increased pressure over these ecosystems due to climate change and human activities. Long term evaluation of specific parameters regarding water quality can now be achieved, thanks to the increased number of archived Earth Observation satellite data, now covering decades. Within this study, 12 years of MODIS information were used to compute surface water turbidity products that were further temporal binned into composite datasets (e.g. monthly, annual). A regional algorithm, based on local in situ measurements, was used in order to inverse remote sensing reflectance values into turbidity units. The interpretation of the final maps revealed important characteristics of the processes that play a major role in the regional turbidity dynamics. Observations were made regarding the relation between surface water turbidity and Danube River's discharge rates, winds, currents and also the bottom sedimentary characteristics of the shelf area. We discuss how different regions are affected by various external factors, depending on their geographical location, and we reinforce the idea that the river solid input is not the only parameter controlling water clarity in the Danube Delta coastal area, resuspension processes playing also an important role.

  19. How Will Hydroelectric Power Generation Develop under Climate Change Scenarios? A Case Study in the Upper Danube Basin

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    Markus Weber

    2011-09-01

    Full Text Available Climate change has a large impact on water resources and thus on hydropower. Hydroelectric power generation is closely linked to the regional hydrological situation of a watershed and reacts sensitively to changes in water quantity and seasonality. The development of hydroelectric power generation in the Upper Danube basin was modelled for two future decades, namely 2021–2030 and 2051–2060, using a special hydropower module coupled with the physically-based hydrological model PROMET. To cover a possible range of uncertainties, 16 climate scenarios were taken as meteorological drivers which were defined from different ensemble outputs of a stochastic climate generator, based on the IPCC-SRES-A1B emission scenario and four regional climate trends. Depending on the trends, the results show a slight to severe decline in hydroelectric power generation. Whilst the mean summer values indicate a decrease, the mean winter values display an increase. To show past and future regional differences within the Upper Danube basin, three hydropower plants at individual locations were selected. Inter-annual differences originate predominately from unequal contributions of the runoff compartments rain, snow- and ice-melt.

  20. Microcrustacean diversity in the Gemenc-Béda-Karapancsa Floodplains (Danube-Drava National Park, Hungary: rare and alien species

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    Ágoston-Szabó, E.

    2015-11-01

    Full Text Available The composition of microcrustacean fauna was investigated in different water bodies of Gemenc-Béda-Karapancsa Floodplains with special regard to the distribution of alien and rare taxa. Between 2002 and 2013 101 taxa (57 Cladocera, 27 Copepoda, 17 Ostracoda, were recorded from the water bodies with differing degrees of connectivity to the main river (eu-, para-, plesio- and paleopotamon. 18 species are reported for the first time from the area of Danube-Drava National Park and among them Daphnia ambigua, Pleuroxus denticulatus and Eurytemora velox are allochtonous species in Hungary. E. velox and P. denticulatus have persistent populations in the area, but their contribution to floodplain biodiversity is still not significant. Daphnia ambigua has only local and temporal populations and its presence is confined to the disconnected side of the floodplain. The abundance of thirty species was very low and their distribution pattern in the floodplain is different. The microcrustacean diversity of the plesiopotamal side arms is remarkable, particularly in the Nyéki-Holt-Danube.

  1. The Danube so colourful: A potpourri of plastic litter outnumbers fish larvae in Europe's second largest river

    Science.gov (United States)

    Lechner, Aaron; Keckeis, Hubert; Lumesberger-Loisl, Franz; Zens, Bernhard; Krusch, Reinhard; Tritthart, Michael; Glas, Martin; Schludermann, Elisabeth

    2014-01-01

    Previous studies on plastic pollution of aquatic ecosystems focused on the world's oceans. Large rivers as major pathways for land-based plastic litter, has received less attention so far. Here we report on plastic quantities in the Austrian Danube. A two year survey (2010, 2012) using stationary driftnets detected mean plastic abundance (n = 17,349; mean ± S.D: 316.8 ± 4664.6 items per 1000 m−3) and mass (4.8 ± 24.2 g per 1000 m−3) in the river to be higher than those of drifting larval fish (n = 24,049; 275.3 ± 745.0 individuals. 1000 m−3 and 3.2 ± 8.6 g 1000 m−3). Industrial raw material (pellets, flakes and spherules) accounted for substantial parts (79.4%) of the plastic debris. The plastic input via the Danube into the Black Sea was estimated to 4.2 t per day. PMID:24602762

  2. Modeling the BOD of Danube River in Serbia using spatial, temporal, and input variables optimized artificial neural network models.

    Science.gov (United States)

    Šiljić Tomić, Aleksandra N; Antanasijević, Davor Z; Ristić, Mirjana Đ; Perić-Grujić, Aleksandra A; Pocajt, Viktor V

    2016-05-01

    This paper describes the application of artificial neural network models for the prediction of biological oxygen demand (BOD) levels in the Danube River. Eighteen regularly monitored water quality parameters at 17 stations on the river stretch passing through Serbia were used as input variables. The optimization of the model was performed in three consecutive steps: firstly, the spatial influence of a monitoring station was examined; secondly, the monitoring period necessary to reach satisfactory performance was determined; and lastly, correlation analysis was applied to evaluate the relationship among water quality parameters. Root-mean-square error (RMSE) was used to evaluate model performance in the first two steps, whereas in the last step, multiple statistical indicators of performance were utilized. As a result, two optimized models were developed, a general regression neural network model (labeled GRNN-1) that covers the monitoring stations from the Danube inflow to the city of Novi Sad and a GRNN model (labeled GRNN-2) that covers the stations from the city of Novi Sad to the border with Romania. Both models demonstrated good agreement between the predicted and actually observed BOD values.

  3. Ozsvath, Zsuzsanna: "When the Danube Ran Red"; Mandel, Eva Marika: "Le Livre de Mana"; Roth, Marika: "All the Pretty Shoes; A Memoir of Survival and the Feminine Spirit".

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    Evi Blaikie

    2011-01-01

    Full Text Available Ozsvath, Zsuzsanna. When the Danube Ran Red. Syracuse University Press, 2010,171 pp., Illus.Mandel, Eva Marika. Le Livre de Mana. Paris, Glyphe 2009, 231 pp., Illus.Roth, Marika. All the Pretty Shoes; A Memoir of Survival and the Feminine SpiritWyatt McKenzy 2010, 254 pp., Illus.Reviewed by Evi Blaikie, Freelance Writer.

  4. A comparison of large 18th-century floods on Danube: Vienna - Bratislava - Budapest

    Science.gov (United States)

    Kiss, Andrea; Parajka, Juraj

    2013-04-01

    The documentation of historic floods can help in better understanding of factors that might cause and contribute to large and extreme flood events. In particular, the analysis of historic floods provides information about flood seasonality, its changes and anthropogenic impacts on river flood regime which in some cases strongly influenced flood behaviour. The main objective of the present contribution is to document large and medium size flood events on Danube in Vienna, Bratislava and Budapest in the 18th century. In the present study, based on contemporary documentary evidence, for each of the three towns a five-scaled flood index series is developed to describe the magnitude and intensity of flood events. According to this classification, the 100-year flood event was characterised by the index value 5, while great destructive floods - depending on their extension, destructivity and further impacts - received the values 4 and 3, respectively. Less significant but still harmful flood events were classified as No. 2, and floods without further specification remained in the lowest category (No. 1). Beside classification issues, seasonality and flood frequency differences between the three towns are as well discussed. The results indicate that a greater number of flood events took place in the last decades of the century, but only a few flood events of the same magnitude are documented simultaneously in all three towns. And whereas in 1775 no winter flood event was reported in Vienna, an important ice jam flood was documented in Bratislava, and a catastrophic ice jam flood event, greatest of the century, occurred in Budapest. In 1787 autumn the greatest flood event of the century occurred in Vienna, while hardly any flood waves were observed at Budapest. While in Vienna, summer (and partly autumn) floods had great importance, in Budapest a large number of ice jam floods were documented. In some cases the differences are likely caused by different hydrometeorological

  5. Sediment dynamics and heavy metal pollution history of the Cruhlig Lake (Danube Delta, Romania).

    Science.gov (United States)

    Begy, Róbert-Csaba; Preoteasa, Luminita; Timar-Gabor, Alida; Mihăiescu, Radu; Tănăselia, Claudiu; Kelemen, Szabolcs; Simon, Hedvig

    2016-03-01

    This is the first study reporting recent sedimentation rates data (e.g. the past 120-150 years) for the Cruhlig Lake situated in the Danube Delta. The aim of this study is to analyse the recent sedimentation rates using the (210)Pb dating method and identifying the heavy metal pollutants and their variability in time. Five sediment cores were taken with a gravity corer and - after drying the sliced samples-physical parameters, organic material and inorganic carbon content were determined. The total (210)Pb content was measured via (210)Po by alpha spectrometry, while supported (210)Pb was measured by (226)Ra (trough short life (222)Rn daughters) with HPGe detectors. Heavy metals were determined by ICP-MS; from the 64 measured elements, only exceeding values of Al, As, Cd, Co, Cs, Cr, Cu, Fe, Hg, K, Li, Mg, Mn, Ni, Pb and Zn are discussed. After applying the CRS model, ages and sedimentation rates were calculated. The average sedimentation rate of the Cruhlig Lake is 0.21 ± 0.02 g/cm(2)y, Minimum values (0.05 ± 0.003 g/cm(2)y) are registered along the eastern shoreline of the lake before 1913, while maximum values are recorded due to the flooding in 2006 in the western side (1.34 ± 0.12 g/cm(2)y). Recent sedimentation rates divide the lake into three areas: the secluded eastern near shore part (0.63 ± 0.07 g/cm(2)y), the centre of the lake (0.92 ± 0.05 g/cm(2)y) and the dynamic western area, where most sediment transport takes place (1.13 ± 0.01 g/cm(2)y). The sedimentation pattern proves this lake to be very sensitive to fluvial discharge fluctuations. The building of the Iron Gate dams (1972 and 1985) had a negative impact on the sedimentation decreasing it with 58.74%, while after 1989 these values grew 2.25 times. The lake received a quantity of sediment rich in heavy metals in 1992 ± 3 y, which settled mostly on the eastern part. Values for Cd, Co, Cr, Hg, Pb and Zn are up to five times higher in 1980 ± 5 y in the eastern part of the lake, while Cd, Co

  6. Education and Training Needs in the Field of Agriculture and Rural Development in the Lower Danube Region

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    Nicolae Istudor

    2010-11-01

    Full Text Available Given the conditions of European Strategy for Labour which was ratified also by Romania, that states an intensifying implementation at national level of labour policies and especially those regarding young person labour market integration, and taking into consideration the great human and agricultural potential of Lower Danube Region, we consider the implementation of national and regional programmes in order to train agriculture and rural development specialists to be very necessary. This article inquires the necessity of training agriculture and rural development specialists within Lower Danube Region in the context of cross-border cooperation between Romania and Bulgaria. This research starts by analysing the European and national legal framework of adult training in those two fields. Subsequently, the main premises and advantages of those activities were emphasized. It is good to mention that the Academy of Economic Studies in Bucharest, Romania, and the D. Tsenov Academy of Economics in Svishtov, Bulgaria, proposed themselves to cooperate in the field of “human resources development – common development of skills and knowledge”. The legal base exists as the Romania-Bulgaria Cross-border Cooperation Programme 2007-2013 is enforced. Furthermore, a four years comparative study of the number of persons trained for the main jobs in rural area, including farmer, in Lower Danube Region was conducted. All these led to the idea that it is necessary to continue and to stress adult training of farmers and rural specialists as a solution for rural economy development and social welfare. Also, comparative analysis of supply and demand of professionals in the field of agriculture was elaborated. The main educational programs in training agriculture and rural development specialists were identified and some problems and perspectives were worked out. This research can be considered as a first step of future deeper and profound collaboration of Tsenov

  7. The intestinal parasite Pomphorhynchus laevis (Acanthocephala) from barbel as a bioindicator for metal pollution in the Danube River near Budapest, Hungary

    Energy Technology Data Exchange (ETDEWEB)

    Thielen, F.; Zimmermann, S.; Baska, F.; Taraschewski, H.; Sures, B

    2004-06-01

    Concentrations of As, Al, Ag, Ba, Bi, Cd, Co, Cr, Cu, Fe, Ga, Mg, Mn, Ni, Pb, Sb, Sn, Sr, Tl, V and Zn were analyzed by inductively coupled mass spectrometry (ICP-MS) in the intestinal helminth Pomphorhynchus laevis and its host Barbus barbus. The fish were caught in the Danube river downstream of the city of Budapest (Hungary). Ten out of twenty one elements analyzed were found at higher concentrations in the acanthocephalan than in different tissues (muscle, intestine, liver and kidney) of barbel. Considering the fish tissues, most of the elements were present at highest concentrations in liver, followed by kidney, intestine and muscle. Spearman correlation analyses indicate that there is competition for metals between the parasites and the host. The negative relationships between parasite number and metal levels in organs of the barbel support this hypothesis. The bioconcentration factors for Ag, As, Ba, Bi, Cu, Ga, Mn, Pb, Sr, Tl, and Zn showed that the parasites concentrated metals to a higher degree than the fish tissues. They accumulated the metals As, Cd, Cu, Fe, Ni, Pb, Sr and Zn even better than established bioindicators such as the mussel Dreissena polymorpha as revealed by data from the literature. The results presented here emphasize that acanthocephalans of fish are very useful as sentinels for metal pollution in aquatic ecosystems. Ratio of metal concentrations in the parasites and the host tissues provide additional information. Not including acanthocephalans in accumulation bioindication studies with fishes (as still customarily done) may lead to false results. - Acanthocephalans of fish may be useful as sentinels of metal pollution in aquatic systems.

  8. Abundance and biomass responses of microbial food web components to hydrology and environmental gradients within a floodplain of the River Danube.

    Science.gov (United States)

    Palijan, Goran

    2012-07-01

    This study investigated the relationships of time-dependent hydrological variability and selected microbial food web components. Samples were collected monthly from the Kopački Rit floodplain in Croatia, over a period of 19 months, for analysis of bacterioplankton abundance, cell size and biomass; abundance of heterotrophic nanoflagellates and nanophytoplankton; and concentration of chlorophyll a. Similar hydrological variability at different times of the year enabled partition of seasonal effects from hydrological changes on microbial community properties. The results suggested that, unlike some other studies investigating sites with different connectivity, bacterioplankton abundance, and phytoplankton abundance and biomass increased during lentic conditions. At increasing water level, nanophytoplankton showed lower sensitivity to disturbance in comparison with total phytoplankton biomass: this could prolong autotrophic conditions within the floodplain. Bacterioplankton biomass, unlike phytoplankton, was not impacted by hydrology. The bacterial biomass less affected by hydrological changes can be an important additional food component for the floodplain food web. The results also suggested a mechanism controlling bacterial cell size independent of hydrology, as bacterial cell size was significantly decreased as nanoflagellate abundance increased. Hydrology, regardless of seasonal sucession, has the potential to structure microbial food webs, supporting microbial development during lentic conditions. Conversely, other components appear unaffected by hydrology or may be more strongly controlled by biotic interactions. This research, therefore, adds to understanding on microbial food web interactions in the context of flood and flow pulses in river-floodplain ecosystems.

  9. Soil microarthropods and their bioindicator value regarding the bio-edaphic conditions in forest ecosystems of Danube Delta

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    Călugăr A.,

    2016-05-01

    Full Text Available The main objective of this study was to compare soil mesofauna communities in natural and anthropogenic forests from Danube Delta Biosphere Reserve and establish a baseline data in monitoring the disturbed sites. The abundance and diversity of edaphic microarthropods were analyzed in five plots, three of them being natural forests and two plantations (Canada poplar, and respectively willow. The mites from Trombidiformes and Oribatida were closely investigated being identified at family level. Qualitative analysis of edaphic microarthropods evidences numerical dominance of mites, excepting only one stand (Canada poplar plantation. Among mites Oribatida owns the biggest weight (76.6 - 94.1% of the total mites, followed by Trombidiformes or Mesostigmata. Among insects the collembolans hold higher density in the poplar plantation, and the lowest one in the willow plantation. Structure of mites communities differs between the investigated ecosystems both in quantitative and qualitative aspects depending on particular conditions of each plot.

  10. Middle Miocene chitons (Polyplacophora from the Slovak part of the Vienna Basin and the Danube Basin (Central Paratethys

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    Ruman Andrej

    2015-12-01

    Full Text Available We describe species-rich chiton assemblages from the Middle Miocene of the Slovak part of the Vienna Basin and the Danube Basin (Central Paratethys. They were found at five localities, including Devínska Nová Ves brickyard, Devínska Nová Ves-Útočnica, Rohožník clay pit, Kúty-45 borehole and Dubová. Thirteen species belong to eight genera from the families Leptochitonidae, Hanleyidae, Callochitonidae, Chitonidae, Tonicellidae and Acanthochitonidae. They occur predominantly in redeposited, moderately-sorted rhodolith-rich or well-sorted bioclastic layers of the Late Badenian age, and belong to lineages that presently inhabit warm-temperate and tropical regions.

  11. The anthropogenic impact on water quality of the river Danube in Serbia: Microbiological analysis and genotoxicity monitoring

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    Kolarević S.

    2011-01-01

    Full Text Available The aim of this work was to examine the impact of urban wastewaters on the water quality of the Danube River in Serbia. Samples of water and sediments for microbiological analysis and genotoxicity monitoring were collected from 6 sites during spring and/or autumn 2010. Sanitary analysis, i.e. enumeration of total and fecal coliforms and intestinal enterococci, indicated moderate to critical fecal contamination, while organic load assessment (oligotroph to heterotroph ratio, index of phosphatase activity revealed the category of moderately polluted water. Mercury-resistant bacteria were detected in all water samples, with high numbers at locations positioned downstream of Belgrade. There was no correlation of the microbiological parameters of the sediment and water samples. Genotoxicity monitoring, performed by the comet assay on hemocytes of mussels Sinanodonta woodiana, indicated a significant increase of DNA damage in mussels collected from the studied sites compared with the control group.

  12. Question mark shaped earrings from Danube Bulgaria(the XIII–XIV cc.: origin and area of spread

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    Vladimirov Georgi V.

    2014-03-01

    Full Text Available A special type of jewelry, earrings shaped as question mark from Bulgaria, is considered. Their spreading area and possible sources of their emergence in the culture of 13-14th-century Danube Bulgaria are made clear. Two stylistic groups are distinguished: those with a simple stylized pattern and those with an intricate pattern. The second group, a more numerous one, finds an analogy in the territory of the Golden Horde. According to the author, it can be argued that the emergence and spread of this type of earrings in the Bulgarian environment is the result of the influence of a "supraethnic" culture of the steppe peoples. These peoples (mainly the Cumans were in the orbit of the Golden Horde.

  13. Large-Scale Water Resources Management within the Framework of GLOWA-Danube - Part A: The Groundwater Model

    Science.gov (United States)

    Barthel, R.; Rojanschi, V.; Wolf, J.; Braun, J.

    2003-04-01

    The interdisciplinary research co-operation Glowa-Danube aims at the development of innovative techniques, scenarios and strategies to investigate the impacts of Global Change on the hydrological cycle within the catchment area of the Upper Danube Basin (Gauge Passau). Both the influence of natural changes in the ecosystem, such as climate change, and changes in human behavior, such as changes in land use or water consumption, are considered. A globally applicable decision support tool "DANUBIA" that comprises 15 individual disciplinary models will be developed. The models are connected with each other via customized interfaces that facilitate network-based parallel calculations. The strictly object-oriented DANUBIA architecture was developed using the graphical notation tool UML (Unified Modeling Language) and has been implemented in Java code. The Institute of Hydraulic Engineering of the Universitaet Stuttgart contributes two models to DANUBIA: A groundwater flow and transport model and a water supply model. The latter is dealt with in a second contribution to this conference. This paper focuses on the groundwater model. The catchment basin of the Upper Danube covers an area of approximately 77.000 km2. The elevation difference from the highest peaks of the Alps to the lowest flatlands in the Danube valley is more than 3.000 m. In addition to the Alps, several lower mountain ranges such as the Black Forest, the Swabian and Franconian Alb and the Bavarian Forest are located respectively in the Northeast, North and Northwest of the basin. The climatic conditions, geomorphology, geology and land use show a wide range of different characteristics. The size and heterogeneity of the area make it extremely difficult to represent the natural conditions in a numerical model. Both data availability and accessibility add to the difficulties that one encounters in the approach to simulate groundwater flow and contaminant transport in this area. The groundwater flow model of

  14. Statistical analysis of the influence of major tributaries to the eco-chemical status of the Danube River.

    Science.gov (United States)

    Ilijević, Konstantin; Obradović, Marko; Jevremović, Vesna; Gržetić, Ivan

    2015-09-01

    We have assembled and assessed the statistical procedure which is capable to objectively explore influence of the Danube's major tributaries (the Rivers Tisa, Sava, and Velika Morava) to its eco-chemical status. Procedure contains several tests for measurement of central tendencies: one-way analysis of variance (ANOVA), repeated measures ANOVA, and nonparametric Kruskal-Wallis and Mann-Whitney tests. Various nuisance factors, (outliers, departures from normality, seasonality, and heteroscedasticity) which are present in large data bases, affect the objectivity of central tendency tests; therefore, it was important not only to estimate their robustness, but also to apply proper procedures for detection of the nuisance factors (Grubbs', generalized ESD-extreme Studentized deviate, Kolmogorov-Smirnov, Shapiro-Wilk, turning point, Wald-Wolfowitz runs, Kendall rank, and Levene's tests) and to mitigate their influence (outlier exclusion, Box-Cox, and logarithmic transformations). The analysis of selected eco-chemical parameters: biological oxygen demand-5, chemical oxygen demand, UV extinction at 254 nm, dissolved oxygen, oxygen saturation, total dissolved solids, electrical conductivity, suspended matter, total phosphorus, phosphates, nitrates, ammonia, pH, total alkalinity, m-2p alkalinity, CO2, and temperature, was performed for 15 years period. The Tisa was the most polluted tributary, but its pollution load was not substantial enough to exceed the Danube self-purification potential. The City of Belgrade was also identified as serious pollution source. Assessment of assembled statistical procedure, which was based on the real environmental data, indicates that proposed tests are sufficiently robust to the observed level of nuisance factors with the exception of pronounced seasonality.

  15. Organochlorine pesticides and polychlorinated biphenyls in surface soils of Novi Sad and bank sediment of the Danube River.

    Science.gov (United States)

    Skrbic, Biljana; Cvejanov, Jelena; Durisic-Mladenovic, Natasa

    2007-01-01

    The contents of 16 organochlorine pesticides (OCPs) and six so-called indicator polychlorinated biphenyls (PCBs) were determined in the surface zone (0-5 cm) of soil and sediment samples, taken from different locations in the city of Novi Sad, capitol of Vojvodina Province (North of the Serbia) covering residential and commercial area, recreational and arable zone. The total organochlorine pesticides concentration in soil varied from 2.63 to 31.78 ng g(-1) dry weight, while the level in sediment was 10.35 ng g(-1) dry weight. Maximum content of identified individual organochlorine pesticide in soil samples was 10.40 ng g(-1) dry weight for p, p-DDE in the market garden and 6.31 ng g(-1) dry weight for p, p'-DDT in sediment of the Danube River, although their application is restricted in Serbia. Some of investigated PCBs were identified only in the soil samples from a park-school backyard in the city downtown (0.32 ng g(-1) dry weight) and market garden (0.22 ng g(-1) dry weight), and also in sediment sample from left bank of the Danube River (0.41 ng g(-1) dry weight). Data of the OCPs and PCBs present in this study were compared with the ones found for soils and river sediments throughout the world, and with limit values set by soil and sediment quality guidelines. Also, correlation between the levels of certain pesticides and soil characteristics (organic matter, pH and clay content) was investigated.

  16. Relative influence of chemical and non-chemical stressors on invertebrate communities: a case study in the Danube River.

    Science.gov (United States)

    Rico, Andreu; Van den Brink, Paul J; Leitner, Patrick; Graf, Wolfram; Focks, Andreas

    2016-11-15

    A key challenge for the ecological risk assessment of chemicals has been to evaluate the relative contribution of chemical pollution to the variability observed in biological communities, as well as to identify multiple stressor groups. In this study we evaluated the toxic pressure exerted by >200 contaminants to benthic macroinvertebrates in the Danube River using the Toxic Unit approach. Furthermore, we evaluated correlations between several stressors (chemical and non-chemical) and biological indices commonly used for the ecological status assessment of aquatic ecosystems. We also performed several variation partitioning analyses to evaluate the relative contribution of contaminants and other abiotic parameters (i.e. habitat characteristics, hydromorphological alterations, water quality parameters) to the structural and biological trait variation of the invertebrate community. The results of this study show that most biological indices significantly correlate to parameters related to habitat and physico-chemical conditions, but showed limited correlation with the calculated toxic pressure. The calculated toxic pressure, however, showed little variation between sampling sites, which complicates the identification of pollution-induced effects. The results of this study show that the variation in the structure and trait composition of the invertebrate community are mainly explained by habitat and water quality parameters, whereas hydromorphological alterations play a less important role. Among the water quality parameters, physico-chemical parameters such as suspended solids, nutrients or dissolved oxygen explained a larger part of the variation in the invertebrate community as compared to metals or organic contaminants. Significant correlations exist between some physico-chemical measurements (e.g. nutrients) and some chemical classes (i.e. pharmaceuticals, chemicals related to human presence) which constitute important multiple stressor groups. This study

  17. Archéologie(s du Paysage et Paysage Archéologique dans la région du Danube inférieur. Histoire d'un projet, méthodologie, et sélection de quelques résultats

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    PHILIPPE FAJON

    2016-12-01

    Full Text Available Landscape Archaeology(ies and Archaelogical Landscape in the Danubes inferior region. A project history, methodology and a selection of some results. Archaeological practising has changed a lot with the new technologies and new intellectual approaches. IT tools, such as GIS, usually used by geographers may open innovative perspectives, only if archaeologists integrate their thinking in a process of "longue durée" with a special attention to the quality and nature of the information processed. The techniques should not be separated from an epistemological reflection. This is what the archeogeography provides in having an analytical and critical view of the geo-historical objects. To show the status of these issues in Romania, we replace the recent works in the history of the Romanian "national archaeological map". Then, five examples of analyzes of historical and archaeological sites around the Lower Danube Valley suggest five research topics, among others, in the fiel of « understanding the landscape systems » : role of hydraulic systems, notion of landscape stability, resilient landscape elements, landscape planning.

  18. THE REPERCUSSIONS IN THE PROCESS OF TRANSFORMATION, REDEFINITION AND PROPOSITION OF THE IDENTITY OF THE DANUBE DELTA THROUGH THE VALORIZATION OF THE TOURIST POTENTIAL

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    Ionica SOARE

    2012-12-01

    Full Text Available The present paper highlights aspects on the status reached by some of the possible directions/ trends of development of the tourism from the Danube Delta, established in different studies and researches, as well as suggestions in eliminating the disfunctions or in order to successfully achieve them. As a consequence of the fact that the tourism in The Biosphere Reserve Danube Delta causes benefits and costs, the planning and development have been established by the main actors so as to aim getting an advantage from the interest shown by tourists in order to improve the economic opportunities, to protect the national and cultural patrimony, to improve the quality of life of all the people belonging to this area.

  19. Impacts of Climate Change on Riverine Ecosystems: Alterations of Ecologically Relevant Flow Dynamics in the Danube River and Its Major Tributaries

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    Judith C. Stagl

    2016-12-01

    Full Text Available River flow dynamics play an important role for aquatic and riparian ecosystems. Climate change is projected to significantly alter river flow regimes in Europe and worldwide. In this study, we evaluate future river flow alterations in the entire Danube River basin by means of ecologically relevant river flow indicators under different climate warming scenarios (Representative Concentration Pathway (RCP 2.6, RCP 4.5, and RCP 8.5. The process-based watershed model SWIM was applied for 1124 sub-catchments to simulate daily time series of river discharge for the Danube River and its tributaries under future scenario conditions. The derived hydrological data series were then statistically analyzed using eight eco-hydrological indicators to distinguish intra-year variations in the streamflow regime. The results are used to: (a analyze the possible impacts of climate change on the ecologically relevant flow regime components; and (b identify regions at the highest risk of climate change-driven flow alterations. Our results indicate that climate change will distinctively alter the recent ecological flow regime of the Danube River and, in particular, the tributaries of the Middle and Lower Danube basin. While for the RCP 2.6 scenario the projected flow alterations might still be considered moderate for many rivers, the impacts might strongly accelerate if global mean temperatures rise more than 2 °C compared to pre-industrial times. Under RCP 4.5 and RCP 8.5 warming scenarios, the recent ecological flow regime might be highly altered, posing a serious threat to river and floodplain ecosystems.

  20. Improving the sampling strategy of the Joint Danube Survey 3 (2013) by means of multivariate statistical techniques applied on selected physico-chemical and biological data.

    Science.gov (United States)

    Hamchevici, Carmen; Udrea, Ion

    2013-11-01

    The concept of basin-wide Joint Danube Survey (JDS) was launched by the International Commission for the Protection of the Danube River (ICPDR) as a tool for investigative monitoring under the Water Framework Directive (WFD), with a frequency of 6 years. The first JDS was carried out in 2001 and its success in providing key information for characterisation of the Danube River Basin District as required by WFD lead to the organisation of the second JDS in 2007, which was the world's biggest river research expedition in that year. The present paper presents an approach for improving the survey strategy for the next planned survey JDS3 (2013) by means of several multivariate statistical techniques. In order to design the optimum structure in terms of parameters and sampling sites, principal component analysis (PCA), factor analysis (FA) and cluster analysis were applied on JDS2 data for 13 selected physico-chemical and one biological element measured in 78 sampling sites located on the main course of the Danube. Results from PCA/FA showed that most of the dataset variance (above 75%) was explained by five varifactors loaded with 8 out of 14 variables: physical (transparency and total suspended solids), relevant nutrients (N-nitrates and P-orthophosphates), feedback effects of primary production (pH, alkalinity and dissolved oxygen) and algal biomass. Taking into account the representation of the factor scores given by FA versus sampling sites and the major groups generated by the clustering procedure, the spatial network of the next survey could be carefully tailored, leading to a decreasing of sampling sites by more than 30%. The approach of target oriented sampling strategy based on the selected multivariate statistics can provide a strong reduction in dimensionality of the original data and corresponding costs as well, without any loss of information.

  1. Between the Danube and the Deep Blue Sea: Zooarchaeological Meta-Analysis Reveals Variability in the Spread and Development of Neolithic Farming across the Western Balkans

    OpenAIRE

    Orton, David; Gaastra, Jane; Vander Linden, Marc

    2016-01-01

    The first spread of farming practices into Europe in the Neolithic period involves two distinct ‘streams’, respectively around the Mediterranean littoral and along the Danube corridor to central Europe. In this paper we explore variation in Neolithic animal use practices within and between these streams, focusing on the first region in which they are clearly distinct (and yet still in close proximity): the western Balkans. We employ rigorous and reproducible meta-analysis of all available zoo...

  2. Between the Danube and the Deep Blue Sea: zooarchaeological meta-analysis reveals variability in the spread and development of Neolithic farming across the western Balkans.

    OpenAIRE

    Orton, David Clive; Gaastra, Jane; Vander Linden, Marc

    2016-01-01

    The first spread of farming practices into Europe in the Neolithic period involves two distinct 'streams', respectively around the Mediterranean littoral and along the Danube corridor to central Europe. In this paper we explore variation in Neolithic animal use practices within and between these streams, focusing on the first region in which they are clearly distinct (and yet still in close proximity): the western Balkans. We employ rigorous and reproducible meta-analysis of all available zoo...

  3. Water quality of the Pannonian basin rivers the Danube, the Sava and the Tisa (Serbia and its correlation with air temperature

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    Pantelić Milana M.

    2015-01-01

    Full Text Available The Danube, the Sava and the Tisa rivers belong to the Black Sea river basin and they flow through many European countries, while in Serbia they flow through the Pannonian flatland. The water quality of these rivers, which is affected by complex anthropogenic activities and natural factors, is one of important factors that are taken into account in the evaluation of development sustainability of this region. Using the correlation analysis in this paper we tested the impact of air temperature as a natural factor on certain parameters indicating the water quality. A significant correlation was found between air temperature and total nitrogen oxides in the Danube of up to -0.744, namely of -0.740 on the Tisa and -0.299 on the Sava. A significant correlation was found in electrical conductivity - up to -0.793 on the Danube, -0.226 on the Tisa, and 0.380 on the Sava. Correlation links were found between air temperature and O2, BOD, as well as suspended matters saturation percentage, but their correlation values are significantly lower. Based on the results of the research it was concluded that air temperature had low effect on changes in water quality during the year and that anthropogenic impact was far more dominant.

  4. Uma nova espécie de Dadayius Fukui, 1929 (Digenea: Cladorchiidae parasita do trato intestinal de Metynnis maculatus (Kner, 1858 (Characidae da planície de inundação do alto rio Paraná, Brasil - DOI: 10.4025/actascibiolsci.v25i2.2044 A new species of Dadayius Fukui, 1929 (Digenea: Cladorchiidae, parasite of the intestinal tract of Metynnis maculates (Kner, 1858 (Characidae from the Upper Paraná River floodplain, Brazil - DOI: 10.4025/actascibiolsci.v25i2.2044

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    Ricardo Massoto Takemoto

    2003-04-01

    Full Text Available Uma nova espécie de Cladorchiidae (Trematoda, Digenea foi encontrada no trato intestinal do peixe de água-doce “pacu peva”, Metynnis maculatus (Kner, 1858 na planície de inundação do Alto Rio Paraná, Brasil. A nova espécie foi classificada no gênero Dadayius Fukui, 1929 por apresentar testículos não lobados e acetábulo ventro-terminal com um “entalhe” postero-mediano na margem interior, características do gênero que possui apenas duas espécies conhecidas. Algumas características que diferem a espécie nova de D. marenzelleri (Daday, 1907 e D. pacuensis Thatcher, 1996 são cecos não alcançando o acetábulo, vitelária de extensão limitada e não atingindo o nível do testículo posterior e a presença de dois tamanhos diferentes de ovos em dois estágios de maturação diferentes.A new species of Cladorchiidae (Trematoda, Digenea was found in the intestinal tract of freshwater fish “pacu peva”, Metynnis maculates (Kner, 1858 from the Upper Paraná River floodplain, southern Brazil. The new species was classified in the genus Dadayius Fukui, 1929 by having non-lobate testis and a ventro-terminal acetabulum with postero median notch on rim, characters of the genus wich has only two previously known species. Some characters that differ the new species from D. marenzelleri (Daday, 1907 and D. pacuensis Thatcher, 1996 are: ceca not reaching acetabulum, vitellaria of limited extension, not reaching the level of posterior testis and the presence of two different egg sizes in two different maturity stages.

  5. Problems and limitations of geospatial elements of environment on the transboundar biosphere reserve Mura-Drava-Danube

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    Petar Ranković

    2015-02-01

    Full Text Available Nature is the source of life, unique and unrepeatable. It is home and ecological framework for all living beings, including man. Everything that makes Earth unique in the universe known to us, beautiful landscapes, rivers, lakes, seas, oceans, mountains, plains, forests, villages, at the beginning of the XXI century has such a look that our ancestors could not even guess. The earth is a gift of the universe. Man's negative impact on nature brought into question not only the survival of natural ecosystems, habitats, plants and animals, but also their own kind. Many plant and animal species have been brought to the brink of survival, because of that, red books and lists are formed, but unfortunately a large number disappeared from Earth forever and they are in the black book. The disappearance of species is associated with the destruction of habitat. Destruction of habitats reduces the surface under natural ecosystems. All this leads to major disruptions in nature. The goal of environmental protection is not only the protection of ecosystems, habitats, plants and animals, but also rapprochement of states and nations. Therefore, the area which is located on the territory of Serbia and Croatian, a Biosphere Reserve "Mura-Drava-Danube", which is on the territory of Serbia emphasizes the special nature reserve "Upper Danube", nature park "Tikvara", and special nature reserve "Karađorđevo", and in the area of Croatian emphasizes nature park "Kopački rit", it is necessary to have better protection. This can be done only through joint action and erasing borders, because the environment does not know about borders. Biosphere reserve stretches not only on the Serbian and Croatian territory, but also on the territory of Hungary, Austria and Slovenia. This common "green vision" will be implemented Europe's largest protected area, which has nickname "European Amazon". Rapprochement of two or more states is the fastest and best done through the environment

  6. Inter-annual variations in the abundance of young-of-the-year of migratory fishes in the Upper Paraná River floodplain: relations with hydrographic attributes Variações interanuais na abundância de jovens-do-ano de peixes migradores da planície de inundação do Alto Rio Paraná: relação com atributos hidrográficos

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    HI. Suzuki

    2009-06-01

    Full Text Available In this study, we identified and characterized the hydrographic attributes related to the success of recruitment of migratory fishes in the Upper Paraná River floodplain. To achieve our objectives, we analyzed inter-annual variations in the abundance of young-of-the-year (YOY; index of recruitment of six migratory species and their relations with hydrographic attributes. Recruitment was related to the intensity, duration (in different fluviometrical levels, elasticity, number of pulses, greater uninterrupted overflow and delay of the floods (all obtained using the PULSO software. Collections of fish were conducted in the period between January 1987 and November 2007 in distinct environments (river channels, secondary channels and connected and disconnected floodplain lakes distributed along three subsystems (Paraná, Baía and Ivinheima. Relations between recruitment and the attributes of interest were determined through analysis of covariance. In the studied period, the highest abundances of YOY were registered in 2007, followed by 1992, 1993, 2005 and 1988. The abundance of YOY was positively correlated with an intensity of high water levels (potamophase and the duration of potamophase 1 and negatively with the duration of low water levels (limnophase and a delay of flood. Higher hydrometric levels (540 and 610 cm for Paraná and 325 and 450 cm for Ivinheima and greatest uninterrupted overflow presented different relations (significant interactions among subsystems, but all with positive effects on recruitment. Results evidenced that recruitment responded better when floods started in January with potamophase intensities above 610 cm and water levels above 450 cm over a period of 50 days and repeated every two years (or > 610 cm for 38 days and repeated every two or three years. Therefore, artificial control of the floods at intervals of two or three years by manipulating the discharge of dams located upstream from the floodplain in a way

  7. Parasites of Apollonia melanostoma (Pallas 1814) and Neogobius kessleri (Guenther 1861) (Osteichthyes, Gobiidae) from the Danube River in Austria.

    Science.gov (United States)

    Mühlegger, J M; Jirsa, F; Konecny, R; Frank, C

    2010-03-01

    Two invasive fish species, the round goby Apollonia melanostoma syn. Neogobius melanostomus (Pallas 1814) and the bighead goby Neogobius kessleri (Günther, 1861), have established a firm population in Austrian waters during the past 15 years. As there have been no records of the parasite fauna from these populations, a total of 79 specimens of A. melanostoma and 12 specimens of N. kessleri were examined for parasites between May and October 2007 from three different sampling sites from the Danube River in Austria. In total 12 parasite taxa were recovered. The protozoans Trichodina sp. and Ichthyophthirius multifiliis from the gills and skin; two crustacean species, Paraergasilus brevidigitus and Ergasilus sieboldi, from the gills; and the two monogeneans Gyrodactylus sp. and Dactylogyrus sp., from the skin and gills respectively, all occurred at low prevalence and intensities. Furthermore, cystacanths of the acanthocephalan Acanthocephalus lucii were found in the body cavity. Metacercariae of the digeneans Diplostomum sp. and Tylodelphys clavata were found in the lens of the eye and the vitreous humour, respectively. Adults of two digeneans, Nicolla skrjabini and Bunodera nodulosa, were found in the intestine. In addition, during this survey metacercariae of the Holarctic digenean Bucephalus polymorphus, encysted in the skin and fins, with prevalence up to 78%, were recorded for the first time in Austria.

  8. Joint modeling of flood peak discharges, volume and duration: a case study of the Danube River in Bratislava

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    Bačová Mitková Veronika

    2014-09-01

    Full Text Available The study is focused on the analysis and statistical evaluation of the joint probability of the occurrence of hydrological variables such as peak discharge (Q, volume (V and duration (t. In our case study, we focus on the bivariate statistical analysis of these hydrological variables of the Danube River in Bratislava gauging station, during the period of 1876-2013. The study presents the methodology of the bivariate statistical analysis, choice of appropriate marginal distributions and appropriate copula functions in representing the joint distribution. Finally, the joint return periods and conditional return periods for some hydrological pairs (Q-V, V-t, Q-t were calculated. The approach using copulas can reproduce a wide range of correlation (nonlinear frequently observed in hydrology. Results of this study provide comprehensive information about flood where a devastating effect may be increased in the case where its three basic components (or at least two of them Q, V and t have the same significance.

  9. Water management, environmental protection and spatial planning reconciliation: "Accommodating" the Danube and the Tisa river in Serbia

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    Pihler Vladimir

    2013-01-01

    Full Text Available Water management in Serbia has been mostly operating in a framework of public companies and institutions focused on strictly sectorial and technical expertise on hydraulic engineering, environmental protection and navigable traffic engineering within the highly autonomous legislative framework. On the cross-point of spatial planning and water management there is a growing debate on the important discourses of the policy domains. Seeing rivers as an “accommodated” generator of opportunities is a statement which is opposing the traditional consideration of strict separation of water from the land. Spatial planning as a framework for regulating the land use has an important function in integrating the water management and landscape more closely. In Serbian spatial planning practice there is growing practice of area-specific development planning (reflected through the Spatial plans for the special-purpose areas which are considered to accommodate new ideas on spatiality better than the traditional, sectorial planning documents. The question is placed as to how these practices could direct new spatial arrangements of integrative collaborative spatial planning and not just merely reflect the framework of the existing planning order. This paper seeks the potential and actual role of spatial planning in addressing challenges related to particular river environments on the Tisa and the Danube rivers. The research is based on the analysis of two Spatial plans for the special-purpose areas which are still in conceptual phase - The Cultural landscape of Bač and Multifunctional ecological corridor of the Tisa river.

  10. Considerations regarding Barrow Burials and Metal Depositions during the Early Bronze Age in the Carpathian-Danube Area

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    Bianca Preda

    2015-12-01

    Full Text Available The beginning of the Early Bronze Age brought significant changes in the Carpathian-Danube Area, including new burial customs, a different economy and innovative technologies, most of them with eastern steppe origins. Thus, burial barrows appeared in the landscape raised over rectangular grave-pits, sometimes with wood or stone structures containing individuals lying in contracted or supine position with flexed legs, stained with ochre, rarely accompanied by grave-goods like wares, ornaments or weapons made of stone, bone and precious metals. Among the metallurgical innovations, items such as silver hair rings, copper shaft-hole axes and tanged daggers are considered specific to the new era. However, a careful approach of the deposition contexts of these artifacts, as compared with the eastern space, indicates that in some cases the objects were not just adopted, but reinterpreted and involved in different social practices. This paper aims to analyze the manner in which metal pieces were disposed of and to identify the rules governing this behavior.

  11. A review of Gobiid expansion along the Danube-Rhine corridor – geopolitical change as a driver for invasion

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    Roche K.F.

    2013-09-01

    Full Text Available Five Gobiid fish species have recently increased their ranges along the Danube/Rhine river corridor. Studies to date, however, have tended to be local, site specific and reactive, examining just one or few species. As such, overall range has tended to be assumed based on a summary of patchy, and sometimes contradictory, data. This study provides an up-to-date literature review of first records of occurrence for all five species along their expansion route. In addition, available shipping data are examined to identify possible proximal causes of introduction. Three main discontinuous population centres were identified; all at or near important container ports: Vienna, Duisburg and Rotterdam. Shipping is confirmed as an important factor in the rapid national and international expansion of Ponto-Caspian Gobiids, with downstream drift, rip-rap and heavy boat traffic contributing to rapid spread on the Rhine. Geopolitical factors, however, such as the fall of communism and the Balkan conflict, have been key in influencing where, when, and by which route gobies first appear. Rapid expansion of Gobiids in the Rhine raises the possibility of establishment throughout mainland Europe via two new potential invasion corridors across Germany/Poland and France.

  12. Heavy metal and trace element bioaccumulation in target tissues of four edible fish species from the Danube River (Serbia).

    Science.gov (United States)

    Subotić, Srđan; Spasić, Slađana; Višnjić-Jeftić, Zeljka; Hegediš, Aleksandar; Krpo-Ćetković, Jasmina; Mićković, Branislav; Skorić, Stefan; Lenhardt, Mirjana

    2013-12-01

    Pikeperch (Sander lucioperca), European catfish (Silurus glanis), burbot (Lota lota), and common carp (Cyprinus carpio) were collected from the Danube River (Belgrade section, Serbia), and samples of liver, muscle, and gills were analyzed for Al, As, B, Ba, Cd, Co, Cr, Cu, Fe, Hg, Li, Mn, Mo, Ni, Pb, Se, Sr, and Zn using inductively coupled plasma optical emission spectrometry (ICP-OES) to highlight the importance of species and tissue selection in monitoring research, contaminant studies, and human health research. The Kruskal-Wallis test revealed significant differences between fish species in regard to metal levels in liver, muscle, and gills. The principal component analysis (PCA) indicated that the studied fish species could be grouped on the basis of the level of analyzed elements in liver and gills. The Mann-Whitney test showed two subsets (one comprising two piscivorous species, pikeperch and catfish, and the other, two polyphagous species, burbot and carp) in regard to Cr and Hg levels in liver (higher levels in piscivorous species), as well as B, Fe, and Hg in gills (B and Fe with higher levels in polyphagous and Hg in piscivorous species), and As in muscle (higher levels in polyphagous species). Carp had distinctly higher levels of Cd, Cu, and Zn in liver in comparison to other three species. None of the elements exceeded the maximum acceptable concentrations (MAC). However, since Hg levels are close to the prescribed MAC levels, the consumption of these fishes can be potentially hazardous for humans.

  13. The influence of environmental abiotic factors on the qualitative and quantitative structure of ichthyofauna from predeltaic Danube area

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    Petronela Georgiana Calin Sandu

    2013-05-01

    Full Text Available The aim of the paper  is to analyse the influence of environmental factors on the capture and fish communities structure from Danube, between Siret River and Prut River mouth. Fish were collected from April to December 2012 in four fishing areas. During the year, 4910 kg, respectively 7121 fish of 31 species were collected. Cyprinidae, the dominant family, 54.84% in term of number of species, was represented by 17 species (Cyprinus carpio, Carassius gibelio, Barbus barbus, Abramis brama, Abramis sapa, Blicca bjoerkna, Leuciscus idus, Vimba vimba, Aspius aspius, Pelecus cultratus, Chondrostoma nasus, Ctenopharingodon idella, Hypophthalmichthys molitrix, Hypophthalmichthys nobilis, Scardinius erythrophthalmus, Rutilus rutilus, Alburnus alburnus. Other families had the following structure: Percidae (16.13% with 5 species (Sander lucioperca, Zingel zingel, Zingel streber, Perca fluviatilis, Gymnocephalus schraetzer, Acipenseridae (12.90% with 4 species (Huso huso, Acipenser stellatus, Acipenser ruthenus, Acipenser gueldenstaedtii, Clupeidae (6.45% with two species (Alosa immaculata, Alosa tanaica, Siluridae (3.23% with one species (Silurus glanis, Esocidae (3.23% with one species (Esox lucius  and Salmonidae (3.23% with one species also (Salmo labrax. The highest capture was 2977.93 kg (60.65%, during the spring season (April-May, followed by autumn season (September–November, with 992.39 kg (20.21%. The water level and water flow showed high correlation with both number and total catch, respectively.

  14. How schlieren affects beam transmissometers and LISST-Deep: an example from the stratified Danube River delta, NW Black Sea

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    A. KARAGEORGIS

    2015-07-01

    Full Text Available The term ‘schlieren’ describes angular deflection of a light ray when it passes through a fluid region characterized by refractive index inhomogeneities. These inhomogeneities in the marine environment are generally caused by density variations, i.e. salinity and temperature anomalies. The influence of schlieren on transmissometers and the in situ particle sizer LISST-Deep of Sequoia Scientific are examined in the Danube delta during October 2007. A seasonal pycnocline driven mainly by an intense temperature gradient was identified as a major hydrological feature. It was associated with high buoyancy frequency values and minor changes of the refractive index of seawater. Measurements of two 25-cm path-length transmissometers (660 nm and 470 nm showed distinguishable peaks at the pycnocline. LISST also uses a 5-cm transmissometer (670 nm, which proved to be very sensitive in both cases. This is mainly due to its very small acceptance angle, which enables enhanced light scattering outside the lens, thus increasing beam attenuation. Subsequently, LISST falsely predicts abundance of large particles within the pycnoclines. A buoyancy frequency N of 0.01 s-1 is the new proposed threshold for schlieren occurrence.

  15. Metal concentrations in water, sediment and three fish species from the Danube River, Serbia: a cause for environmental concern.

    Science.gov (United States)

    Ivanović, Jelena; Janjić, Jelena; Baltić, Milan; Milanov, Raša; Bošković, Marija; Marković, Radmila V; Glamočlija, Nataša

    2016-09-01

    The aim of this study was to investigate the presence of metal contamination in water, sediments and three different fish species. All samples were taken from the Danube River in Belgrade Region, a location upstream from Grocka. Concentrations of Cd, Hg and Pb in water samples were not detected, while concentrations of Zn, Fe, Cu and As were in the range of 0.004-0.41 mg L(-1). Iron was the most deposited metal in sediment samples (17,530.00 mg kg(-1)). For the purpose of heavy metal determination in fish tissue, silver carp, common carp and wels catfish were collected. Concentrations of Pb, Cd and As were determined in muscle, digestive tract and liver by inductively coupled plasma-optical emission spectrophotometry (IPC-OES). The highest concentration of Pb was in the digestive tract of all three fish species, while Cd was mostly deposited in the liver. The highest concentration of Hg was in the muscle tissue of wels catfish, and these values are above the maximum residual levels prescribed by the European Union and the maximum allowed concentrations (MACs) for Serbia. Concentration of As was mostly deposited in the liver, but under the MAC.

  16. Concepts of the body and personhood in the Mesolithic-Neolithic Danube Gorges: interpreting animal remains from human burials

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    Ivana Živaljević

    2016-02-01

    Full Text Available In recent years, humanities have brought forward the idea of non-human agency; either in the form of meanings bestowed upon objects, animals and natural phenomena, or through deconstruction of ontological differences between ‘people’ and ‘things’. In case of the former, it has been argued that non-human agents have the power to act as ‘participants’ in social action (e.g. the agentive power of material properties of things, or of animal behaviour. In this paper, I discuss the practice of placing animal body parts alongside human bodies in the Mesolithic-Neolithic Danube Gorges, by using the concept of perspectivism as a theoretical framework. The choice of species and their body parts varied, but was by no means accidental. Rather, it reflected certain culturally specific taxonomies, which were based on animal properties: how they look, move, feel or what they do. Common examples include red deer antlers, which have the power to ‘regenerate’ each year, or dog mandibles (physical remains of ‘mouths’ which have the power to ‘communicate’ (i.e. bark. The aim of the paper is to explore how various aspects of animal corporeality, associated with certain ways of seeing and experiencing the world, could be ‘borrowed’ by humans utilizing animal body parts.

  17. Ecotoxicological assessment of sediment, suspended matter and water samples in the upper Danube River. A pilot study in search for the causes for the decline of fish catches.

    Science.gov (United States)

    Keiter, Steffen; Rastall, Andrew; Kosmehl, Thomas; Wurm, Karl; Erdinger, Lothar; Braunbeck, Thomas; Hollert, Henner

    2006-09-01

    Fish populations, especially those of the grayling (Thymallus thymallus), have declined over the last two decades in the upper Danube River between Sigmaringen and Ulm, despite intensive and continuous stocking and improvement of water quality since the 1970s. Similar problems have been reported for other rivers, e.g. in Switzerland, Great Britain, the United States and Canada. In order to assess if ecotoxicological effects might be related to the decline in fish catch at the upper Danube River, sediment, suspended matter and waste water samples from sewage treatment plants were collected at selected locations and analyzed in a bioanalytical approach using a battery of bioassays. The results of this pilot study will be used to decide if a comprehensive weight-of-evidence study is needed. Freeze-dried sediments and suspended particulate matters were extracted with acetone in a Soxhlet apparatus. Organic pollutants from sewage water were concentrated using XAD-resins. In order to investigate the ecotoxicological burden, the following bioassays were used: (1) neutral red assay with RTL-W1 cells (cytotoxicity), (2) comet assay with RTL-W1 cells (genotoxicity), (3) Arthrobacter globiformis dehydrogenase assay (toxicity to bacteria), (4) yeast estrogen screen assay (endocrine disruption), (5) fish egg assay with the zebrafish (Danio rerio; embryo toxicity) and (6) Ames test with TA98 (mutagenicity). The results of the in vitro tests elucidated a considerable genotoxic, cytotoxic, mutagenic, bacteriotoxic, embryotoxic and estrogenic burden in the upper Danube River, although with a very inhomogeneous distribution of effects. The samples taken from Riedlingen, for example, induced low embryo toxicity, but the second highest 17beta-estradiol equivalent concentration (1.8 ng/L). Using the fish egg assay with native sediments, a broad range of embryotoxic effects could be elucidated, with clear-cut dose-response relationships for the embryotoxic effects of contaminated

  18. The Contributions of the Economic Press from the Lower Danube to the Development of Romanian Culture and Literature during 1846 - 1915

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    Cristina Dosuleanu

    2012-12-01

    Full Text Available This paper presents some of the research conducted on the Lower Danube Press. In itsdevelopment it was intended to reveal important elements of the publication, in the economic domain,but also the contributions of the newspapers to the Romanian literature. The economic activityparticularly intense in the Lower Danube area resulted in the release of a large number of magazinesthat supported this activity. The first magazine in Galati was published in 1846, called theDunărea/Danube. Its content came in the support of the merchants, who dealt with trade, agricultureand navigation asMercur/Mercuryin Braila, following another publication in 1849 of economic fromGalati,Jurnalul de Galaţi/Galati Journal. These first publications have in common their release inseveral European languages of interest to traders: Italian, it was preferred as it used the Latin alphabetand it was easier to print the publication, Greek or French. In this category of papers there werereleased newspapers of scholarships, commercial clubs, as an expression of the concerns of suchmembers, among whom there were also the cultural ones. It was also highlighted the fact that thesepublications have contributed to the evolution of the Romanian language but also of literature, ofcourse at a lower level than the literary publications. There have been discovered also publicationsthat had nothing to do with literature or economic, financial or literary phenomena, their purposebeing only publishing documents regulating the economic activities, one example being theSemaphore de Brăila/Semaphore of Braila. It was also noted the involvement of the authorities in thepromotional activities of the economy through various publications with the title of calendars,monitors, or daily newspapers, which had a modest culturalcontribution. Compared with other typesof publications, the economic ones are the most numerous, as the ones from the political domain.

  19. Improvement of Professional Training of Maritime Fleet Specialists: Experience of Interactive Technologies Introduction in the Danube Institute of National University «Odessa Maritime Academy»

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    Olga Demchenko

    2016-08-01

    Full Text Available The article focuses on the coverage of the most effective methods and technologies on improving communicative skills during the professional training of maritime fleet specialists. A complex study of skills formation process for communication in a foreign language in the Danube Institute of National University «Odessa Maritime Academy» has identified its the most problematic areas. In the result of using interactive technologies («brainstorming», project techniques, etc. was established positive dynamics in formation of skills of professional communication.

  20. PRESENCE OF THE MOST ECONOMICALLY IMPORTANT FISH SPECIES IN THE RIVER DANUBE AND ITS FLOOD ZONES IN SERBIA

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    Zoran Marinović

    2012-12-01

    Full Text Available On the basis of the data published between 1983 and 2008, this paper shows presence of tench (Tinca tinca, carp (Cyprinus carpio, pike (Esox lucius, catfish (Silurus glanis, zander (Sander lucioperca and sterlet (Acipenser ruthenus in the Gornje Podunavlje and Koviljsko-Petrovaradinski Rit Special Nature Reserves and the Begečka Jama Nature Park, as well as in the part of the Danube’s bed between river kilometre 1249- and 1255. The number of these fish species in the River Danube and its flood zones in this part of the Pannonian Basin is decreasing due to the use of inappropriate “tools”, electric current, uncontrolled agricultural and industrial waste dumps, degradation of the habitat. The above mentioned species deserve attention because, according to the Rulebook on declaration and protection of protected and strictly protected wild species of plants, animals and fungi of 2010, in Serbia, T. tinca is a strictly protected species, while C. carpio, E. lucius, S. glanis, S. lucioperca and A. ruthenus are listed as protected. On the basis of the 2009 Fisheries Law in Serbia, permanently closed fishing season was introduced for tench, and closed season in certain periods and fishing ban for individuals under the prescribed size for the rest of the above mentioned species. A. ruthenus is subject to the Law on Ratification of Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES, ANNEX II and is listed in the category of species that may be in danger of extinction. Furthermore, it can be found on the IUCN Red List of Endangered Species of the International Union for Conservation of Nature – VU, which means that it is marked as vulnerable.

  1. Source identification, spatio-temporal distribution and ecological risk of persistent organic pollutants in sediments from the upper Danube catchment.

    Science.gov (United States)

    Kukučka, Petr; Audy, Ondřej; Kohoutek, Jiří; Holt, Eva; Kalábová, Tereza; Holoubek, Ivan; Klánová, Jana

    2015-11-01

    Riverine sediments, collected on a monthly basis during a period of one year, from five sites in a mixed land use region of the Czech Republic were analysed for chlorinated and brominated persistent organic pollutants (POPs). The region is located in the upper catchment of the Danube River. The POPs concentrations were as follows: 11-930 pg g(-1) polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDDs/Fs), 170-980 pg g(-1) dioxin-like polychlorinated biphenyls (dl-PCBs), 34-13,700 pg g(-1) polychlorinated naphthalenes (PCNs), 5.7-29,200 pg g(-1) polybrominated diphenylethers (PBDEs) and 0.21-351 ng g(-1) hexabromocyclododecanes (HBCDs). Concentrations expressed as toxic equivalents (TEQs), for PCDD/F+dl-PCB+PCN (TEQPCDD/F+dl-PCB+PCN) ranged from 0.37 to 19 pg g(-1). The results revealed a clear spatial separation between sites based on concentration and congener profile. There were also some obvious temporal patterns of selected POPs, which were related to river flow (seasonality) and organic carbon (TOC) of the sediment. Potential sources of POPs include local municipalities (flame retardants), some diffuse sources (PCNs and PCDDs/Fs) and potential point sources (PBDEs). Risk assessment based on risk quotients (RQ) revealed limited to medium ecological risk from PBDEs. TEQPCDD/F+dl-PCB+PCN were low relative to other European rivers, hence the risk to aquatic organisms was considered to be low. PCNs contributed significantly to overall TEQ in several cases. Copyright © 2015 Elsevier Ltd. All rights reserved.

  2. Modelling of dissolved oxygen in the Danube River using artificial neural networks and Monte Carlo Simulation uncertainty analysis

    Science.gov (United States)

    Antanasijević, Davor; Pocajt, Viktor; Perić-Grujić, Aleksandra; Ristić, Mirjana

    2014-11-01

    This paper describes the training, validation, testing and uncertainty analysis of general regression neural network (GRNN) models for the forecasting of dissolved oxygen (DO) in the Danube River. The main objectives of this work were to determine the optimum data normalization and input selection techniques, the determination of the relative importance of uncertainty in different input variables, as well as the uncertainty analysis of model results using the Monte Carlo Simulation (MCS) technique. Min-max, median, z-score, sigmoid and tanh were validated as normalization techniques, whilst the variance inflation factor, correlation analysis and genetic algorithm were tested as input selection techniques. As inputs, the GRNN models used 19 water quality variables, measured in the river water each month at 17 different sites over a period of 9 years. The best results were obtained using min-max normalized data and the input selection based on the correlation between DO and dependent variables, which provided the most accurate GRNN model, and in combination the smallest number of inputs: Temperature, pH, HCO3-, SO42-, NO3-N, Hardness, Na, Cl-, Conductivity and Alkalinity. The results show that the correlation coefficient between measured and predicted DO values is 0.85. The inputs with the greatest effect on the GRNN model (arranged in descending order) were T, pH, HCO3-, SO42- and NO3-N. Of all inputs, variability of temperature had the greatest influence on the variability of DO content in river body, with the DO decreasing at a rate similar to the theoretical DO decreasing rate relating to temperature. The uncertainty analysis of the model results demonstrate that the GRNN can effectively forecast the DO content, since the distribution of model results are very similar to the corresponding distribution of real data.

  3. Levantamento florístico e fitofisionomia da lagoa Figueira e seu entorno, planície alagável do alto rio Paraná, Porto Rico, Estado do Paraná, Brasil - DOI: 10.4025/actascibiolsci.v25i1.2091 Floristic survey and phytophysiognomy of the Figueira pond in the upper Paraná River floodplain, in Porto Rico, state of Paraná, Brazil - DOI: 10.4025/actascibiolsci.v25i1.2091

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    Maria Conceição de Souza

    2003-04-01

    Full Text Available Foi realizada uma caracterização botânica da lagoa Figueira (planície alagável do alto rio Paraná, Porto Rico, Estado do Paraná, Brasil, a 22o45’36’’S e 53ol5’56’’W, empregando-se levantamentos florísticos e perfis fitofisionômicos em diferentes períodos fluviométricos, além de uma carta batimétrica e análise do solo. O levantamento florístico resultou no reconhecimento de 36 famílias, 75 gêneros e 89 espécies. As famílias de maior riqueza específica foram Poaceae (14 espécies, seguida por Cyperaceae e Euphorbiaceae (oito cada. O porte predominante pertenceu ao herbáceo (79,78% das espécies e, quanto à forma biológica, houve predominância das terrestres (50,56% e das anfíbias (37,08%. A fitofisionomia, com predominância de herbáceas, apresenta diferenciações entre as margens e ao longo da lagoa, havendo uma considerável diminuição da cobertura vegetal no período de águas altas. Essa lagoa foi considerada um corpo de água raso, com solo tipo argilosoA botanical characterization of the Figueira pond (Upper Paraná River floodplain, in Porto Rico, State of Paraná, Brazil, at 22o45’36’’ S and 53ol5’56’’ W has been carried out using floristic surveys and phytophysiognomic profiles, in different water periods, together with a bathymetric chart and a soil analysis. The floristic survey resulted in 36 families, 75 genera and 89 species. The families with more specific richness were Poaceae (14 species, followed by Cyperaceae and Euphorbiaceae (eight each. The highest habit incidence belonged to the herbaceous (79,78% of the species and, concerning the biological form, there was predominance of the terrestrial (50,56% and amphibious ones (37,08%. The phytophysiognomy, with predominance of herbaceous, shows differentiation between the banks and along the pond, with a considerable decrease of the vegetal covering in the high water periods. This pond was considered a shallow body of water, with

  4. Hábitos alimentares e sobreposição trófica das raias Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae na planície alagável do alto rio Paraná, Brasil - DOI: 10.4025/actascibiolsci.v28i3.208 Feeding habitats and trophic overlap of the freshwater stingrays Potamotrygon falkneri e Potamotrygon motoro (Chondrichthyes, Potamotrygonidae in the upper Paraná river floodplain, Brazil - DOI: 10.4025/actascibiolsci.v28i3.208

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    Edson Fontes de Oliveira

    2007-11-01

    Full Text Available As raias Potamotrygon falkneri e Potamotrygon motoro foram avaliadas em relação à composição de suas dietas e a sobreposição do nicho trófico nos períodos de seca (agosto/2004 e cheia (janeiro/2005 na planície alagável do alto rio Paraná, em três estações de coleta próximas à ilha Mutum. Foram analisados 49 conteúdos estomacais de P. falkneri e 16 de P. motoro, obtidos de espécimes capturados através de pesca com anzol, fisga (arpão e espinhel. Os conteúdos estomacais foram analisados de acordo com os métodos de freqüência volumétrica e de ocorrência. A similaridade da dieta foi quantificada pelo índice de sobreposição de Pianka. As espécies revelaram flexibilidade alimentar, com ambas consumindo predominantemente moluscos na cheia, enquanto na seca a dieta de P. falkneri foi composta principalmente por peixes e a de P. motoro por insetos aquáticos. Os valores do índice de sobreposição de nicho variaram entre 0,38 na seca (moderado e 0,94 na cheia (acentuado. A variação da composição das dietas foi atribuída à s oscilações na disponibilidade dos recursos alimentares no ambiente.Feeding habits and trophic overlap of freshwater stingrays Potamotrygon falkneri e Potamotrygon motoro were evaluated in the upper Paraná river floodplain. Samples were collected during periods of drought (August/2004 and flood (January/2005 near Mutum island. Fishhook, harpoon and long line were used to capture the individuals and a total of 49 stomach contents of P. falkneri and 16 of P. motoro were analyzed. Diet composition was analyzed by the relative occurrence and volumetric frequencies. The trophic overlap was quantified by the index of niche overlap of Pianka. Results indicated that both species predominantly consumed mollusks during the flood season, while in the drought season the diet of P. falkneri was composed mainly by fish and P. motoro for aquatic insects. The values of the index of niche overlap varied from 0

  5. Copépodes parasitos de fossas nasais de cinco espécies de peixes (Characiformes da planície de inundação do alto rio Paraná, Paraná, Brasil - DOI: 10.4025/actascibiolsci.v29i4.887 Parasitic copepods in the nasal fossae of five fish species (Characiformes from the upper Paraná river floodplain, Paraná, Brazil - DOI: 10.4025/actascibiolsci.v29i4.887

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    Maria de los Angeles Perez Lizama

    2008-02-01

    Full Text Available O presente trabalho teve como objetivo o estudo de copépodes parasitos de fossas nasais de peixes da planície de inundação do alto Rio Paraná. As coletas foram realizadas em diversos pontos da planície nos meses de março, junho e setembro de 2004. Foram coletados 73 exemplares de peixes da ordem Characiformes, de quatro famílias distintas, pertencentes a cinco espécies: Acestrorhynchus lacustris, Prochilodus lineatus, Schizodon borellii, Serrasalmus maculatus e Serrasalmus marginatus. Dentre os 73 peixes examinados, 53 encontravam-se parasitados por copépodes de fossas nasais, variando de 1 a 146 parasitos por peixe. Os parasitos encontrados pertenciam a três espécies conhecidas: Gamidactylus jaraquensis Thatcher & Boeger, 1984; Gamispatulus schizodontis Thatcher & Boeger, 1984 e Rhinergasilus piranhus Boeger & Thatcher, 1988. Diferenças foram observadas nas medidas corporais dos parasitos e na quantidade de espécies de parasitos por espécie de peixe em relação aos copépodes encontrados em estudos anteriores na região amazônica. O presente estudo constitui um dos poucos trabalhos de identificação de copépodes parasitos de fossas nasais de peixes da região Sul do Brazil.The present work had the objective to study parasitic copepods in the nasal fossae of fish from the upper Paraná river floodplain. Fish were captured in different locations of the floodplain in March, June and September, 2004. A total of 73 specimens (Characiformes were collected, belonging to 4 distinct families and 5 species: Acestrorhynchus lacustris (Acestrorhynchidae, Schizodon borellii (Anostomidae, Prochilodus lineatus (Prochilodontidae, Serrasalmus marginatus and Serrasalmus maculatus (Serrasalmidae. Among 73 fishes examined, 53 were parasitized by nasal fossae copepods, varying from 1 to 146 parasites per host. Parasites found belonged to 3 known species: Gamidactylus jaraquensis Thatcher & Boeger, 1984; Gamispatulus schizodontis Thatcher & Boeger

  6. Improving the evaluation of hydrological multi-model forecast performance in the Upper Danube Catchment

    NARCIS (Netherlands)

    Bogner, K.; Cloke, H.; Pappenberger, F.; Roo, A.P.J. de; Thielen, J.

    2011-01-01

    Medium range flood forecasting activities, driven by various meteorological forecasts ranging from high resolution deterministic forecasts to low spatial resolution ensemble prediction systems, share a major challenge in the appropriateness and design of performance measures. In this paper

  7. The Creation and Development of Innovative Infrastructure in the Danube Countries

    OpenAIRE

    Liudmila Rosca-Sadurschi

    2014-01-01

    Entrepreneurship development is supported by a developed infrastructure or innovative infrastructure. The purpose of the business infrastructure is to create favorable conditions for its development by providing support in various areas, complete and targeted to businesses. Training system infrastructure provides creation and development of innovation infrastructure objects. Thus, this article will conduct a comparative analysis of the elements of innovation infrastructure and how...

  8. High sensitive multiresidue analysis of pharmaceuticals and antifungals in surface water using U-HPLC-Q-Exactive Orbitrap HRMS. Application to the Danube river basin on the Romanian territory

    NARCIS (Netherlands)

    Chitescu, C.L.; Kaklamanos, George; Nicolau, A.I.; Stolker, Linda

    2015-01-01

    The occurrence of 67 pharmaceutical and antifungal residues in the Danube river on the Romanian territory was studied by using solid-phase extraction (SPE) and LC-Q Exactive Orbitrap high resolution MS in both full scan (FS) MS and targeted MS/MS modes. A single-laboratory validation procedure

  9. High sensitive multiresidue analysis of pharmaceuticals and antifungals in surface water using U-HPLC-Q-Exactive Orbitrap HRMS. Application to the Danube river basin on the Romanian territory

    NARCIS (Netherlands)

    Chitescu, C.L.; Kaklamanos, George; Nicolau, A.I.; Stolker, Linda

    2015-01-01

    The occurrence of 67 pharmaceutical and antifungal residues in the Danube river on the Romanian territory was studied by using solid-phase extraction (SPE) and LC-Q Exactive Orbitrap high resolution MS in both full scan (FS) MS and targeted MS/MS modes. A single-laboratory validation procedure wa

  10. The Creation and Development of Innovative Infrastructure in the Danube Countries

    Directory of Open Access Journals (Sweden)

    Liudmila Rosca-Sadurschi

    2014-08-01

    Full Text Available Entrepreneurship development is supported by a developed infrastructure or innovative infrastructure. The purpose of the business infrastructure is to create favorable conditions for its development by providing support in various areas, complete and targeted to businesses. Training system infrastructure provides creation and development of innovation infrastructure objects. Thus, this article will conduct a comparative analysis of the elements of innovation infrastructure and how their development in different countries. Innovation infrastructure elements analyzed are: information infrastructure refers to access to information; Financial infrastructure refers to financial resources; infrastructure, staff training (qualified staff; material and technical infrastructure; infrastructure consulting (expert consultation; marketing infrastructure.

  11. Methodological Principles of Investigating Semantic Structure of Ukrainian Axionomens of the Danube Region

    Directory of Open Access Journals (Sweden)

    Tetyana Soroka

    2015-08-01

    Full Text Available The article is dedicated to the description of the procedure of axionomens’ formalized analysis. Matrix method of investigating words denoting spiritual values in the modern Ukrainian language is proposed. Matrix is defined to be a two-dimensional structure which replaces oversimplified notation systems used in componential analysis. Matrix enables a researcher to study all the interconnections between the related meanings of different lexical units as well as between different meanings of a specific lexical unit. It consists of two axes – a vertical one indicates a lexical stock and a horizontal one means a seme stock of the collected language material. The application of matrix method in practice proves that the structural organization of axiovocabulary considerably becomes complicated; internal mechanisms and dynamics of semantic cooperations of axionomens are revealed under the influence of extra-linguistic factors. Matrix presentation of non-material values gives an opportunity to describe in detail the structure of axionouns’ lexical meanings which are not in chaotic order, but clearly organized, to distinguish the degree of their related semantics, to expose the functional character of semes forming definite structures within the framework of analyzed words. The proposed methodology of researching the relations between lexico-semantic groups is considered to be perspective in studying all lexical sub-systems of the value paradigms of the English and French language societies.

  12. Environmental Histories and Emerging Fisheries Management of the Upper Zambezi River Floodplains

    Directory of Open Access Journals (Sweden)

    Abbott James

    2009-01-01

    Full Text Available In response to a widespread decline in fisheries, scientists and policy makers have constructed models outlining the biological and social drivers that cause changes in fishing intensity and methods identified with overfishing. The models also address the consequences of overfishing, namely changes in biomass, trophic structure and ecosystem resilience, as well as increased poverty and vulnerability of the fishers, particularly in the developing world. While these models have emerged from marine and coastal fisheries, they have also been used to identify overfishing in floodplain fisheries and to guide management recommendations. In this article, we critique the assumptions of a global overfishing narrative describing the serial depletion of fish species, increased fishing effort and fisher dependence, which are considered valid by various stakeholders in the floodplain fisheries of the Upper Zambezi River. We find that researchers highlight how the inherent variability of the floodplain environment defies the simple diagnoses of overfishing, based on changes in effort and methods or livelihood. However, the views of policy makers and local users on the ′problem of overfishing′ are that the fish biomass is declining and intensive fishing methods are to blame, which largely resonate with the narrative. We consider how differing emphasis on parts of the narrative by stakeholders has implications for management, and what such differences tell us about the malleability of narratives.

  13. Archaeology in the Mississippi River Floodplain at Sand Run Slough, Iowa,

    Science.gov (United States)

    1987-06-01

    fragments of black walnut (Jualans nigra ). A single specimen from a Late Archaic feature appears to be from a butternut (J. cinerea). The acorn shell...Gymnocladus spp. 4 2.- .7 Gleditsia triacantnos - - 3 2.0 Juglans spp. 6 4.- 7 4.8 Morus rubra 2 1.4 2 1.4 Populus/Salix spp. 8 5.5 13 8.9 Salix spp. 2 1.4

  14. Patterns of forest succession and impacts of flood in the Upper Mississippi River floodplain ecosystem

    Science.gov (United States)

    Yin, Y.; Wu, Y.; Bartell, S.M.; Cosgriff, R.

    2009-01-01

    The widespread loss of oak-hickory forests and the impacts of flood have been major issues of ecological interest concerning forest succession in the Upper Mississippi River (UMR) floodplain. The data analysis from two comprehensive field surveys indicated that Quercus was one of the dominant genera in the UMR floodplain ecosystem prior to the 1993 flood and constituted 14% of the total number of trees and 28% of the total basal area. During the post-flood recovery period through 2006, Quercus demonstrated slower recovery rates in both the number of trees (4%) and basal area (17%). In the same period, Carya recovered greatly from the 1993 flood in terms of the number of trees (11%) and basal area (2%), compared to its minor status before the flood. Further analyses suggested that different species responded to the 1993 flood with varying tolerance and different succession strategies. In this study, the relation of flood-caused mortality rates and DBH, fm(d), can be expressed in negative exponential functions for each species. The results of this research also indicate that the growth functions are different for each species and might also be different between pre- and post-flood time periods. These functions indicate different survival strategies and emergent properties in responding to flood impacts. This research enhances our understanding of forest succession patterns in space and time in the UPR floodplain. And such understanding might be used to predict long-term impacts of floods on UMR floodplain forest dynamics in support of management and restoration. ?? 2009 Elsevier B.V.

  15. A method for distinguishing different water sources during flood events in river floodplains, northern Poland

    NARCIS (Netherlands)

    Chormanski, J.; Karalevich, J.; Kardel, I.; Okruszko, T.; Wassen, M.J.

    2010-01-01

    The Biebrza wetlands are located in an ice-marginal valley in northeastern Poland and cover some 195 000 hectares. The Biebrza river is not regulated, the valley is not reclaimed and still has marsh, fen and grassland vegetation whereas large scale human interventions in hydrology are absent. The mo

  16. Cyanobacteria abundance and its relationship to water quality in the Mid-Cross River floodplain, Nigeria

    Directory of Open Access Journals (Sweden)

    Okogwu Okechukwu I

    2009-06-01

    Full Text Available The physicochemical variables and cyanobacteria of Mid-Cross River, Nigeria, were studied in six stations between March 2005 and August 2006 to determine the relationship between water quality and cyanobacteria abundance. Canonical Correspondence Analysis (CCA showed that biological oxygen demand (BOD, dissolved oxygen, pH, water velocity, width and depth were important environmental factors that influenced cyanobacteria abundance. Trace metals, phosphate and nitrate increased significantly from values of previous studies indicating increased eutrophication of the river but were weakly correlated with cyanobacteria abundance and could be scarcely regarded as regulating factors. A higher cyanobacteria abundance was recorded during the wet season in most of the sampled stations. The dominant cyanobacteria included Microcystis aeruginosa, Aphanizomenon flos-aquae, Oscillatoria limnetica and Anabaena spiroides. The toxins produced by these species could degrade water quality. The factors favouring cyanobacteria abundance were identified as increased pH, width and depth. Increase in cyanobacteria abundance was associated with reduction in dissolved oxygen and increase in BOD values. Rev. Biol. Trop. 57 (1-2: 33-43. Epub 2009 June 30.Las variables físico-químicas y la abundancia de cianobacterias del río nigeriano Mid-Cross fueron estudiadas en seis estaciones entre marzo del 2005 y agosto del 2006. El Análisis de Correspondencia Canónica (CCA demostró que la demanda biológica de oxígeno (DBO, oxígeno disuelto, pH, velocidad de agua, anchura y profundidad son factores ambientales importantes que influyen en la abundancia de cianobacterias. Los mayores valores de trazas de metales, fosfatos y nitratos, en comparación con estudios previos, indican mayor eutrofización, pero tienen poca correlación con la abundancia de las cianobacterias. La mayor abundancia de cianobacterias se registró durante el periodo más húmedo de la estación seca en la mayoría de las estaciones de muestreo. Las cianobacterias dominantes incluyen Microcystis aeruginosa, Aphanizomenon flos-Aquae, Oscillatoria limnetica y Anabaena spiroide. Las toxinas producidas por estas especies podrían degradar la calidad del agua. Los factores que favorecen la abundancia de cianobacterias fueron identificados como el aumento de pH, ancho y profundidad. El aumento de la abundancia se asoció con una reducción de oxígeno disuelto y un aumento de los valores de DBO.

  17. The impact of nitrogen contamination and river modification on a Mississippi River floodplain lake.

    Science.gov (United States)

    Karthic, Indu; Brugam, Richard B; Retzlaff, William; Johnson, Kevin

    2013-10-01

    Anthropogenic nitrogen contamination has increased in ecosystems around the world (frequently termed the "nitrogen cascade"). Coke production for steel manufacturing is often overlooked as a source of nitrogen to natural ecosystems. We examined sediment cores from a Horseshoe Lake, a floodplain lake located just East of St. Louis Missouri (USA) to test whether a coking plant effluent could be traced using stable isotopes of nitrogen and diatom microfossils. The distribution of δ(15)N values in surface sediment samples from the lake shows the highest values near the coking plant effluent. Stable isotopes of nitrogen from 4 sediment cores using a mixing model showed three sources of nitrogen since 1688 CE. The first source (active between 1688 and 1920 CE) had a calculated δ(15)N value ranging between -0.4 and 1.1‰ depending on the core. After 1920 a second source with a δ(15)N ranging between 10.6 and 15.4‰ became active. The change in these sources coincides with the construction of a coking plant on the lake shore. A third source with a value approximately 7.0‰ was present at all times and represents background. The diatom microfossil assemblages present from 1688 CE to the late 1800s are dominated by the planktonic species Aulacoseira granulata and periphytic and benthic genera Gomphonema, Cocconeis, and Lyrella. After the late 1800s the diatom assemblages are dominated by Staurosira species indicating a shift of species from high flow riverine environments to epipelic species from a lake environment. Diatom microfossils seem to track the reduction in flooding due to leveeing of the floodplain and the isolation of the lake from the river. Our results show how stable isotopes of nitrogen can be used to track nitrogen inputs from industrial sources. Diatom changes corresponded with changes in connectivity between the Mississippi River and its floodplain.

  18. Metals and arsenic in soils and corresponding vegetation at Central Elbe river floodplains (Germany).

    Science.gov (United States)

    Overesch, M; Rinklebe, J; Broll, G; Neue, H-U

    2007-02-01

    Floodplain soils at the Elbe river are frequently polluted with metals and arsenic. High contents of these pollutants were detected down to subsoil layers. NH4NO3-extractable (phytoavailable) Cd, Ni, and Zn were elevated in horizons with high acidity. Among five common floodplain plant species, Artemisia vulgaris showed highest concentrations of Cd, Cu, and Hg, Alopecurus pratensis of As and Phalaris arundinacea of Ni, Pb, and Zn. Relationships were weak between metal concentrations in plants and phytoavailable stocks in soil. As and Hg uptake seems to be enhanced on long submerged soils. Enrichments of Cd and Hg are linked to a special plant community composition. Grassland herbage sampled in July/August revealed higher concentrations of As (+122%), Hg (+124%), and Pb (+3723%) than in May. To limit harmful transfers into the food chain, low-lying terraces and flood channels revealing highest contaminations or phytoavailabilities should be excluded from mowing and grazing.

  19. Breeding bird assemblages associated with stages of forest succession in large river floodplains

    Science.gov (United States)

    Knutson, M.G.; McColl, L.E.; Suarez, S.A.

    2005-01-01

    Floodplain forests rival all other habitat types in bird density and diversity. However, major successional changes are predicted for floodplain forests along the Mississippi River in the coming decades; young forests may replace the existing mature silver maple (Acer saccharinum L.) forests in some areas. We wanted to assess how the breeding bird community might respond to these changes. We studied stands of young forests along the middle Mississippi River, comparing the breeding bird assemblages among three stages of forest succession: shrub/scrub, young cottonwood (Populus deltoides Marshall) and willow (Salix nigra Marshall) forests, and mature silver maple dominated forests. We recorded a total of 54 bird species; the most frequently observed species were the indigo bunting (Passerina cyanea), red-winged blackbird (Agelaius phoeniceus), and yellow-billed cuckoo (Coccyzus americanus). Bird species richness differed among the habitat types, with mature forests supporting the largest number of species and the most species of management concern. The shrub/scrub and mature forest bird assemblages were distinct and shared few species, but the young forests had no identifiable bird species assemblage, sharing species found in both of the other habitat types. The bird assemblages we observed in young forests may become more prevalent as aging floodplain forests are replaced with younger stages of forest succession. Under this scenario, we would expect a temporary local decrease in bird species richness and habitat for species of management concern.

  20. Flow regime effects on mature Populus fremontii (Fremont cottonwood) productivity on two contrasting dryland river floodplains

    Science.gov (United States)

    Andersen, Douglas C.

    2016-01-01

    I compared riparian cottonwood (Populus fremontii) productivity-discharge relationships in a relictual stand along the highly regulated Green River and in a naturally functioning stand along the unregulated Yampa River in semiarid northwest Colorado. I used multiple regression to model flow effects on annual basal area increment (BAI) from 1982 to 2011, after removing any autocorrelation present. Each BAI series was developed from 20 trees whose mean size (67 cm diameter at breast height [DBH]) was equivalent in the two stands. BAI was larger in the Yampa River stand except in 2 y when defoliating leaf beetles were present there. I found no evidence for a Yampa flood-magnitude threshold above which BAI declined. Flow variables explained ∼45% of residual BAI variability, with most explained by current-year maximum 90-d discharge (QM90) in the Yampa River stand and by a measure of the year-to-year change in QM90 in the Green River stand. The latter reflects a management-imposed ceiling on flood magnitude—Flaming Gorge Dam power plant capacity—infrequently exceeded during the study period. BAI in the relictual stand began to trend upward in 1992 when flows started to mimic a natural flow regime. Mature Fremont cottonwoods appear to be ecologically resilient. Their productivity along regulated rivers might be optimized using multiyear environmental flow designs.

  1. Chehalis River Floodplain Land Cover Mapping between Aberdeen and Montesano, Washington,

    Science.gov (United States)

    1980-01-01

    use activities in the study area include residential and business, industrial, and gravel extraction. We would like to acknowledge contributions by...these large woodlots may support large mamals such as black-tailed deer (Odocoileus hemionus) and coyote (Canis latrans). Sensitive species (eagles...Lnx rufus), as well as small birds, small mam- mals, reptiles , and amphibians. Coastal forests also support several species which are rare or

  2. Bioaccessibility of arsenic in mining-impacted circumneutral river floodplain soils.

    Science.gov (United States)

    Mikutta, Christian; Mandaliev, Petar N; Mahler, Nina; Kotsev, Tsvetan; Kretzschmar, Ruben

    2014-11-18

    Floodplain soils are frequently contaminated with metal(loid)s due to present or historic mining, but data on the bioaccessibility (BA) of contaminants in these periodically flooded soils are scarce. Therefore, we studied the speciation of As and Fe in eight As-contaminated circumneutral floodplain soils (≤ 21600 mg As/kg) and their size fractions using X-ray absorption spectroscopy (XAS) and examined the BA of As in the solids by in-vitro gastrointestinal (IVG) extractions. Arsenopyrite and As(V)-adsorbed ferrihydrite were identified by XAS as the predominant As species. The latter was the major source for bioaccessible As, which accounted for 5-35% of the total As. The amount of bioaccessible As increased with decreasing particle size and was controlled by the slow dissolution kinetics of ferrihydrite in the gastric environment (pH 1.8). The relative BA of As (% of total) decreased with decreasing particle size only in a highly As-contaminated soil--which supported by Fe XAS--suggests the formation of As-rich hydrous ferric oxides in the gastric extracts. Multiple linear regression analyses identified Al, total As, C(org), and P as main predictors for the absolute BA of As (adjusted R(2) ≤ 0.977). Health risk assessments for residential adults showed that (i) nearly half of the bulk soils may cause adverse health effects and (ii) particles <5 μm pose the highest absolute health threat upon incidental soil ingestion. Owing to their low abundance, however, health risks were primarily associated with particles in the 5-50 and 100-200 μm size ranges. These particles are easily mobilized from riverbanks during flooding events and dispersed within the floodplain or transported downstream.

  3. Estimating groundwater dynamics at a Colorado River floodplain site using historical hydrological data and climate information

    Science.gov (United States)

    Chen, Jinsong; Hubbard, Susan S.; Williams, Kenneth H.; Ficklin, Darren L.

    2016-03-01

    Long-term prediction of groundwater dynamics is important for assessing water resources and their impacts on biogeochemical cycling. However, estimating future groundwater dynamics is challenging due to the wide range of spatiotemporal scales in hydrological processes and uncertainty in future climate conditions. In this study, we develop a Bayesian model to combine small-scale historical hydrological data with large-scale climate information to estimate groundwater dynamics at a floodplain site in Rifle, Colorado. Although we have only a few years of groundwater elevation measurements, we have 47 years of streamflow data from a gaging station approximately 43 km upstream and long-term climate prediction on the Upper Colorado River Basin. To estimate future daily groundwater dynamics, we first develop a time series model to downscale the monthly streamflow derived from climate information to daily streamflow, and then transform the daily streamflow to groundwater dynamics at the downstream floodplain site. We use Monte Carlo methods to estimate future groundwater dynamics at the site through sampling from the joint posterior probability distribution. The results suggest that although future groundwater levels are expected to be similar to the current levels, the timing of the high groundwater levels is predicted to occur about 1 month earlier. The developed framework is extendable to other sites to estimate future groundwater dynamics given disparate data sets and climate projections. Additionally, the obtained estimates are being used as input to a site-specific watershed reactive transport models to predict how climate-induced changes will influence future biogeochemical cycling relevant to a variety of ecosystem services.

  4. A PROBABILITY SURVEY OF SUCCESSIONAL FOREST COMPOSITION AND CONDITION IN A GREAT RIVER FLOODPLAIN LANDSCAPE

    Science.gov (United States)

    Floodplains within the Great River Ecosystems (GREs) of the central U.S. are composed of dynamic mosaics of successional habitat that (when unmodified) are typically dominated by cottonwood forest (Populus ssp.). GRE riparian habitat condition and successional dynamics are linked...

  5. Biogeochemical constraints on the ecological rehabilitation of wetland vegetation in river floodplains

    NARCIS (Netherlands)

    Lamers, L.P.M.; Loeb, R.; Antheunisse, A.M.; Miletto, M.; Lucassen, E.C.H.E.T.; Boxman, A.W.; Smolders, A.J.P.; Roelofs, J.

    2006-01-01

    The European policy for river management during peak discharge periods is currently changing from exclusion strategies (reinforcement of dykes) to allowing a more natural situation by creating more floodplain space to reduce water levels during peak discharges. In addition, water retention and water

  6. A seasonal survey of the fish of the Kavango River floodplain along ...

    African Journals Online (AJOL)

    denise

    schemes for water resource utilization are being con- ... The results of the first seasonal survey of the fish of the Kavango River ... research reported here in that seasonal shifts in abun- ... of 10 500×106 m3 per year at the Botswana border ..... 70.0 53.0 32.0 50.0 50.0 ..... probably a reflection of gear selectivity based on its.

  7. Hydrologic and hydraulic modelling of the Nyl River floodplain Part 3 ...

    African Journals Online (AJOL)

    2007-01-01

    Jan 1, 2007 ... by catchments which are experiencing continuing water resource ... Careful dam operation could ameliorate impacts in very dry years, however. .... decreases rapidly, reflecting the seasonal variability of the flood- ..... tions and some hydraulic modelling were carried out by the first ... Research Foundation.

  8. The Palimpsest of River-Floodplain Management and the Role of Geomorphology

    NARCIS (Netherlands)

    Hudson, Paul F; Middelkoop, Hans

    2015-01-01

    Embanked floodplains are the status-quo where humans are a major component of the environment, especially across Europe and North America. Effective management of embanked rivers requires a comprehensive knowledge of past and present-day geomorphic processes, including sediment transport and channel

  9. Arsenic in groundwater of the Red River floodplain, Vietnam: Controlling geochemical processes and reactive transport modeling

    DEFF Research Database (Denmark)

    Postma, Diederik Jan; Larsen, Flemming; Hue, N.T.M.

    2007-01-01

    with redox zonation dominated by the reduction of Fe-oxides and methanogenesis. Enhanced PCO2 pressure causes carbonate dissolution to take place but mainly in the soil and unsaturated zone. The concentration of As increases over depth to a concentration of up to 550 mu g/L. Most As is present as As...... indicate most As to be related to the Fe-oxide fractions. The measured amount of sorbed As is low. In agreement, speciation calculations for a Fe-oxide surface suggest As(III) to constitute only 3% of the surface sites while the remainder is occupied by carbonate and silica species. The evolution in water...

  10. Uncertainty in biogeomorphological assessments of lowland river floodplains resulting from landcover classification errors

    NARCIS (Netherlands)

    Straatsma, M.W.; Perk, M. van der; Schipper, A.; Nooij, R. de; Leuven, R.; Huthoff, F.; Middelkoop, H.

    2011-01-01

    Landcover maps provide essential input data for a sequence of models used to quantify the hydrodynamics and ecology of lowland rivers and their floodplains. Hydrodynamic models provide estimates of peak water levels and sediment deposition while ecological models characterize habitat suitability, bi

  11. Inter- and intraspecific variation in mercury bioaccumulation by snakes inhabiting a contaminated river floodplain.

    Science.gov (United States)

    Drewett, David V V; Willson, John D; Cristol, Daniel A; Chin, Stephanie Y; Hopkins, William A

    2013-04-01

    Although mercury (Hg) is a well-studied contaminant, knowledge about Hg accumulation in snakes is limited. The authors evaluated Hg bioaccumulation within and among four snake species (northern watersnakes, Nerodia sipedon; queen snakes, Regina septemvittata; common garter snakes, Thamnophis sirtalis; and rat snakes, Elaphe obsoleta [Pantherophis alleghaniensis]) from a contaminated site on the South River (Waynesboro, VA, USA) and two nearby reference sites. Total Hg (THg) concentrations in northern watersnake tail tissue at the contaminated site ranged from 2.25 to 13.84 mg/kg dry weight (mean: 4.85 ± 0.29), or 11 to 19 times higher than reference sites. Blood THg concentrations (0.03-7.04 mg/kg wet wt; mean: 2.24 ± 0.42) were strongly correlated with tail concentrations and were the highest yet reported in a snake species. Within watersnakes, nitrogen stable isotope values indicated ontogenetic trophic shifts that correlated with THg bioaccumulation, suggesting that diet plays a substantial role in Hg exposure. Female watersnakes had higher mean THg concentrations (5.67 ± 0.46 mg/kg) than males (4.93 ± 0.49 mg/kg), but no significant differences between sexes were observed after correcting for body size. Interspecific comparisons identified differences in THg concentrations among snake species, with more aquatic species (watersnakes and queen snakes) accumulating higher mean concentrations (5.60 ± 0.40 and 4.59 ± 0.38 mg/kg in tail tissue, respectively) than the more terrestrial species, garter snakes and rat snakes (1.28 ± 0.32 and 0.26 ± 0.09 mg/kg, respectively). The results of the present study warrant further investigation of potential adverse effects and will aid in prioritizing conservation efforts.

  12. Follow-up observations of vegetation associated with the Atigun River floodplain oil spill

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report is a summary of the results of botanical investigations conducted along the Atigun River, associated side channels and tributaries during the period 6, 7...

  13. Invasive riparian vegetation response to flow regimes and flood pulses in a braided river floodplain.

    Science.gov (United States)

    Caruso, Brian S; Pithie, Callum; Edmondson, Laura

    2013-08-15

    This study evaluated flow regimes and flood pulse characteristics, and their influences on invasive riparian vegetation, in a free-flowing braided river in the Southern Alps, South Island, New Zealand. A 46-year gauged flow record was used to evaluate 67 flow metrics for the Ahuriri River, and five sets of colour aerial photographs over 20 years (1991-2011) were analysed to quantify temporal and spatial changes in vegetation (crack willow, Russell lupin, and grassland). The correlation between flow metrics and vegetation class cover for each aerial photo interval was analysed, and multiple regression models were developed. Significant changes in different invasive vegetation classes were found, including cover, number and sizes of patches, and distances from patches to primary channels. In addition to infrequent large floods, specific characteristics of small floods, high flows, low/baseflows, and extreme low flows had influences on different vegetation classes. Key metrics that appear to drive changes in cover and provide a useful multiple regression model include the largest flood peak, frequency of floods, and the time since the last flood for each air photo interval. Up to 25% of invasive vegetation cover was removed and bare substrate increased after the largest flood on record (approximately 50-year flood), and the amount of vegetation cover is highly variable over time and space. Within approximately six years, however, the proportion of vegetation recovered to pre-flood levels. The study reach appears to demonstrate the "shifting-mosaic steady state" conceptual model of riverine floodplains, where the total proportion of substrate, vegetation and water remain relatively constant over long time periods.

  14. Polycyclic aromatic hydrocarbons in soil of the Canadian River floodplain in Oklahoma

    Science.gov (United States)

    Sartori, F.; Wade, T.L.; Sericano, J.L.; Mohanty, B.P.; Smith, K.A.

    2010-01-01

    The accumulation of polycyclic aromatic hydrocarbons (PAH) in soil, plants, and water may impart negative eff ects on ecosystem and human health. We quantified the concentration and distribution of 41 PAH (n = 32), organic C, total N, and S (n = 140) and investigated PAH sources using a chronosequence of floodplain soils under a natural vegetation succession. Soil samples were collected between 0- and 260-cm depth in bare land (the control), wetland, forest, and grassland areas near a closed municipal landfill and an active asphalt plant (the contaminant sources) in the north bank of the Canadian River near Norman, OK. Principal component, cluster, and correlation analyses were used to investigate the spatial distribution of PAH, in combination with diagnostic ratios to distinguish pyrogenic vs. petrogenic PAH suites. Total PAH concentration (??PAH) had a mean of 1300 ng g-1, minimum of 16 ng g-1, and maximum of 12,000 ng g-1. At 0- to 20-cm depth, ??PAH was 3500 ?? 1600 ng g-1 (mean ?? 1 SE) near the contaminant sources. The most common compounds were nonalkylated, high molecular weight PAH of pyrogenic origin, i.e., fluoranthene (17%), pyrene (14%), phenanthrene (9%), benzo(b)fluoranthene (7%), chrysene (6%), and benzo(a)anthracene (5%). ??PAH in the control (130 ?? 23 ng g -1) was comparable to reported concentrations for the rural Great Plains. Perylene had a unique distribution pattern suggesting biological inputs. The main PAH contamination mechanisms were likely atmospheric deposition due to asphalt production at the 0- to 20-cm depth and past landfill operations at deeper depths. Copyright ?? 2010 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. All rights reserved.

  15. The impact of nitrogen contamination and river modification on a Mississippi River floodplain lake

    Energy Technology Data Exchange (ETDEWEB)

    Karthic, Indu [Box 1099 Environmental Sciences Program, Southern Illinois University, Edwardsville, IL 62026 (United States); Brugam, Richard B., E-mail: rbrugam@siue.edu [Box 1651 Department of Biological Sciences, Southern Illinois University, Edwardsville, IL 62026 (United States); Retzlaff, William [Box 1099 Environmental Sciences Program, Southern Illinois University, Edwardsville, IL 62026 (United States); Johnson, Kevin

    2013-10-01

    Anthropogenic nitrogen contamination has increased in ecosystems around the world (frequently termed the “nitrogen cascade”). Coke production for steel manufacturing is often overlooked as a source of nitrogen to natural ecosystems. We examined sediment cores from a Horseshoe Lake, a floodplain lake located just East of St. Louis Missouri (USA) to test whether a coking plant effluent could be traced using stable isotopes of nitrogen and diatom microfossils. The distribution of δ{sup 15}N values in surface sediment samples from the lake shows the highest values near the coking plant effluent. Stable isotopes of nitrogen from 4 sediment cores using a mixing model showed three sources of nitrogen since 1688 CE. The first source (active between 1688 and 1920 CE) had a calculated δ{sup 15}N value ranging between − 0.4 and 1.1‰ depending on the core. After 1920 a second source with a δ{sup 15}N ranging between 10.6 and 15.4‰ became active. The change in these sources coincides with the construction of a coking plant on the lake shore. A third source with a value approximately 7.0‰ was present at all times and represents background. The diatom microfossil assemblages present from 1688 CE to the late 1800s are dominated by the planktonic species Aulacoseira granulata and periphytic and benthic genera Gomphonema, Cocconeis, and Lyrella. After the late 1800s the diatom assemblages are dominated by Staurosira species indicating a shift of species from high flow riverine environments to epipelic species from a lake environment. Diatom microfossils seem to track the reduction in flooding due to leveeing of the floodplain and the isolation of the lake from the river. Our results show how stable isotopes of nitrogen can be used to track nitrogen inputs from industrial sources. Diatom changes corresponded with changes in connectivity between the Mississippi River and its floodplain. - Highlights: • Effluent from a steel plant increases fixed nitrogen input to a floodplain lake. • Isotopes of nitrogen in the lake surface sediment show the location of effluent. • Simple binary mixing model reconstructs the isotope signature of nitrogen sources. • Diatoms from sediment cores show a history of flooding—not eutrophication.

  16. Productivity assessment of two great blue herons colonies in the Roanoke River Floodplain

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Conine Creek colony was comprised of a mix of great egrets and great blue herons. The great egrets outnumbered the great blue herons by at least two to one. We...

  17. Assessment of Missouri River floodplain invertebrates during historic inundation: implications for river restoration

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    Gosch N.J.C.

    2014-01-01

    Full Text Available Floodplain connectivity is important to aquatic organisms in large rivers. Anthropogenic alterations regulating the Missouri River have limited connectivity and negatively affected native fauna. Determining the biological response to rare inundation events may be important when considering potential restoration options on a regulated river; thus, we assessed benthic invertebrate and zooplankton communities at three floodplain sites during a historic Missouri River high-water event. Chironomid larvae dominated during most sampling trips and densities were often highest during initial sampling trips with lower densities as high water persisted. Similar trends were evident for rotifer, cladoceran, and copepod densities. Nonmetric multidimensional scaling also showed relatively high dissimilarity of densities between early and late sampling trips for benthic invertebrate and zooplankton communities. As such, short-term inundation may be more beneficial to Missouri River benthic invertebrate (mainly chironomid larvae and zooplankton production than more prolonged inundation lasting a month or more. Furthermore, restoration projects may be designed at elevations allowing more short-term inundation, which would likely benefit native fishes with additional spawning, nursery, and foraging habitat. Levee setbacks may be an effective restoration option for increasing the amount of habitat available for short-term inundation while potentially providing socioeconomic, flood-risk reduction benefits by enhancing flow conveyance.

  18. Tectonostratigraphic evolution of the Danube Basin: inferences from gravity, magnetic and seismic data

    Science.gov (United States)

    Zalai, Zsófia; Balázs, Attila; Balázs, László

    2017-04-01

    The 220-290 km of Miocene extension observed in the Pannonian basin system of Central Europe was driven by the rapid roll-back of the Carpathian slab. Basin formation was coupled with the extrusion of the Eastern Alps with large amounts of translation and vertical axis rotations. In the hanging wall of low-angle normal faults and detachments few kilometers thick syn-rift sediments deposited during the Early to Middle Miocene (Karpatian, Badenian and Sarmatian). Following a spectacular unconformity they are overlain by the gently folded thick Pannonian to Quaternary deposits. A novel tectono-stratigraphic interpretation was carried out in the Csapod and Győr-Kenyeri sub-basins using a dense network of reflection seismic data supported by gravity and magnetic anomaly maps. Incorporating new biostratigraphical data from deep wells the spatial and temporal patterns of the Miocene deformation was analyzed. 3D geological model was constructed using the gravity and magnetic forward modeling software (IGMAS+, e.g., Götze & Lahmeyer, 1988) based on the potential field anomalies (). Dz magnetic anomalies imply the location of buried volcanic bodies while the gravity anomalies indicate the buried basement highs. Our seismic interpretation revealed that asymmetric extension (Tari et al. 1992) was diachronous in the basin system. Oldest half-grabens closer to the basin margins were characterized by Karpatian (ca. 17.2-16.3 Ma) extension with limited amount of Badenian post-kinematic sedimentation. Toward the basin centre, in the Csapod Through the culmination of extension is Badenian (16-13 Ma) in age. Further to the deepest depocenters, in the Győr-Kenyeri depression, half-graben formation was still active during late Badenian - Sarmatian (14-11.6 Ma). Uplift and exhumation of the footwalls of the half-grabens are shown by the interpretation of depth-converted seismic data. Our estimations on this uplift of the footwalls are in the order of a few hundreds of meters, up to 1

  19. The potential of coordinated reservoir operation for flood mitigation in large basins - A case study on the Bavarian Danube using coupled hydrological-hydrodynamic models

    Science.gov (United States)

    Seibert, S. P.; Skublics, D.; Ehret, U.

    2014-09-01

    The coordinated operation of reservoirs in large-scale river basins has great potential to improve flood mitigation. However, this requires large scale hydrological models to translate the effect of reservoir operation to downstream points of interest, in a quality sufficient for the iterative development of optimized operation strategies. And, of course, it requires reservoirs large enough to make a noticeable impact. In this paper, we present and discuss several methods dealing with these prerequisites for reservoir operation using the example of three major floods in the Bavarian Danube basin (45,000 km2) and nine reservoirs therein: We start by presenting an approach for multi-criteria evaluation of model performance during floods, including aspects of local sensitivity to simulation quality. Then we investigate the potential of joint hydrologic-2d-hydrodynamic modeling to improve model performance. Based on this, we evaluate upper limits of reservoir impact under idealized conditions (perfect knowledge of future rainfall) with two methods: Detailed simulations and statistical analysis of the reservoirs' specific retention volume. Finally, we investigate to what degree reservoir operation strategies optimized for local (downstream vicinity to the reservoir) and regional (at the Danube) points of interest are compatible. With respect to model evaluation, we found that the consideration of local sensitivities to simulation quality added valuable information not included in the other evaluation criteria (Nash-Sutcliffe efficiency and Peak timing). With respect to the second question, adding hydrodynamic models to the model chain did, contrary to our expectations, not improve simulations, despite the fact that under idealized conditions (using observed instead of simulated lateral inflow) the hydrodynamic models clearly outperformed the routing schemes of the hydrological models. Apparently, the advantages of hydrodynamic models could not be fully exploited when

  20. Use of pilot-controlled horizontal drilling for a culvert under the Danube near the town of Aschach; Einsatz gesteuerter Horizontalbohrtechnik zur Unterduekerung der Donau bei Aschach

    Energy Technology Data Exchange (ETDEWEB)

    Marek, H. [Ferngas AG, Linz (Austria)

    1998-10-01

    The challenge involved in the `Donaudueker Aschach` (Aschach sub-Danube Culvert) project was that of drilling through the river bed in an exceptionally difficult geological structure. Tunnelling started in Aschach, and the drill emerged from the soil precisely on target after 470 m at the connecting point close to Feldkirchen. A 200 mm diameter steel pipe was installed into this boring without any hindrance to road and river traffic, and construction between Aschach and Feldkirchen was successfully completed. (orig.) [Deutsch] Die Herausforderung beim Bauvorhaben `Donaudueker Aschach` war die Durchbohrung des Flussbettes in einer aeusserst schwierigen geologischen Struktur. In Aschach wurde mit der Tunnelbohrung begonnen und punktgenau tauchte nach 470 m der Bohrkopf an der Anschlussstelle Feldkirchen aus dem Erdreich auf. Ohne Verkehrs- und Schiffahrtsbeeintraechtigung wurde in die Bohrung ein Stahlrohr mit 200 mm Durchmesser eingezogen und der Bau zwischen Aschach und Feldkirchen erfolgreich durchgefuehrt. (orig.)

  1. STUDY UPON THE MACROZOOBENTHIC COMMUNITIES FROM THE DANUBE RIVER BY BAZIAŞ-PORŢILE DE FIER SECTOR (SOUTH-WESTERN ROMANIA

    Directory of Open Access Journals (Sweden)

    ADINA-MIRELA PANĂ

    2009-01-01

    Full Text Available Different sensitivity of benthic macroinvertebrates was used in determining water quality of the eight major tributaries of the Danube, which drains two mountain ranges: Locvei and Almăjului, within the context in which the macrozoobenthic community is influenced by changes in the qualitative parameters of aquatic ecosystems. To get an overview, a series of physical- chemical parameters (water temperature, pH, oxygen, conductivity, cyanide, nitrites, nitrates, phosphates was studied in parallel with the study of benthic community. Elevated abundance of benthic groups in the case of water quality characteristic (Ephemeroptera, Trichoptera, Plecoptera, Amphipoda, along with their high frequency in all the monitored tributaries in the present study and the water quality parameters maintained within normal limits fits these lotic ecosystems in the A class of surface water quality.

  2. A History of Pebbles and Silt – Fluvial Sediment Transport, Hydropower and Technical Expertise at the Austrian Danube and its Tributaries

    Directory of Open Access Journals (Sweden)

    Schoder Angelika

    2016-08-01

    Full Text Available The paper investigates experts’ perceptions of hydropower, sediment regime, and their interaction in the 20th century with an environmental historical approach, based on various case studies at both the Danube River and one of its tributaries, and on a review of contemporary literature authored by engineers. Results show that questions of sediment continuity have engaged planners of hydropower plants since the advent of this technology, and decisions were at any time influenced by multiple interests (navigation, electricity demand, nature conservation. In such an intricate fluvial landscape, phenomena like reservoir sedimentation and riverbed incision can be approached as “legacies” of past technical interventions, which limit the options of current and future river management.

  3. Diazotrophy in alluvial meadows of subarctic river systems.

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    Thomas H DeLuca

    Full Text Available There is currently limited understanding of the contribution of biological N2 fixation (diazotrophy to the N budget of large river systems. This natural source of N in boreal river systems may partially explain the sustained productivity of river floodplains in Northern Europe where winter fodder was harvested for centuries without fertilizer amendments. In much of the world, anthropogenic pollution and river regulation have nearly eliminated opportunities to study natural processes that shaped early nutrient dynamics of large river systems; however, pristine conditions in northern Fennoscandia allow for the retrospective evaluation of key biochemical processes of historical significance. We investigated biological N2 fixation (diazotrophy as a potential source of nitrogen fertility at 71 independent floodplain sites along 10 rivers and conducted seasonal and intensive analyses at a subset of these sites. Biological N2 fixation occurred in all floodplains, averaged 24.5 kg N ha(-1 yr(-1 and was down regulated from over 60 kg N ha(-1 yr(-1 to 0 kg N ha(-1 yr(-1 by river N pollution. A diversity of N2-fixing cyanobacteria was found to colonize surface detritus in the floodplains. The data provide evidence for N2 fixation to be a fundamental source of new N that may have sustained fertility at alluvial sites along subarctic rivers. Such data may have implications for the interpretation of ancient agricultural development and the design of contemporary low-input agroecosystems.

  4. Fish –based diet- correlations between metabolism of carbohydrates, lipidis and proteins. Study case population of the Sulina Town, Danube Delta

    Directory of Open Access Journals (Sweden)

    Georgiana ENE

    2016-06-01

    Full Text Available According to literature data, the normal values of biochemical parameters in blood vary by sex, age, geographical region, and type of diet. The aim of this study was to analyze the benefits of a fish-based diet among the population of Sulina, in the Danube Delta (3,663 individuals, by performing a comparative hepatic evaluation, lipid profile, serum glucose levels and total protein profile of these patients. Fish is an important source of protein with high biological value, containing all essential aminoacids and low lipid levels. The novelty of the research is represented by the analyzed geographical area. The Danube Delta had no medical analysis laboratory until 2010, when the RoutineMed Sulina laboratory was opened. Patients had a set of biochemical tests in the RoutineMed Sulina laboratory and declared they eat fish or fish-based products at least once a week. Tests were performed on 200 patients for the evaluation of the liver of these patients: Aspartate Amino Transferase, alanine amino transferase, de Ritis ratio, High Density Lipoprotein, Low Density Lipoprotein, total lipids, total cholesterol, triglycerides and 200 tests for the evaluation of the serum glucose levels and total protein. Both women and men were involved in the research and patients were grouped into age ranges: 20-40 years, 40-60 years, > 60 years. The values obtained were statistically analyzed using the SPSS v. 20 software and then compared to the ranges considered normal for these parameters. The results obtained showed that patients with a fish-based diet seem to be healthier than those with a diet in which fish meat is scarce, as their blood biochemical parameters values are closer to normal, which leads to the conclusion that including fish and fish products in people's regular diet is beneficial in preventing lipid, protein and carbohydrate metabolism disorders and preserving the overall health of the body.

  5. Organic carbon and nitrogen export from a tropical dam-impacted floodplain system

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    R. Zurbrügg

    2013-01-01

    Full Text Available Tropical floodplains play an important role in organic matter transport, storage, and transformation between headwaters and oceans. However, the fluxes and quality of organic carbon (OC and organic nitrogen (ON in tropical river-floodplain systems are not well constrained. We explored the quantity and characteristics of dissolved and particulate organic matter (DOM and POM, respectively in the Kafue River flowing through the Kafue Flats (Zambia, a tropical river-floodplain system in the Zambezi River basin. During the flooding season, > 80% of the Kafue River water passed through the floodplain, mobilizing large quantities of OC and ON, which resulted in a net export of 69–119 kg OC km−2 d−1 and 3.8–4.7 kg ON km−2 d−1, 80% of which was in the dissolved form. The elemental C : N ratio of ~ 20, the comparatively high δ13C values of −25‰ to −21‰, and its spectroscopic properties (excitation-emission matrices showed that DOM in the river was mainly of terrestrial origin. Despite a threefold increase in OC loads due to inputs from the floodplain, the characteristics of the riverine DOM remained relatively constant along the sampled 410-km river reach. This suggests that floodplain DOM displayed properties similar to those of DOM leaving the upstream reservoir and implied that the DOM produced in the reservoir was relatively short-lived. In contrast, the particulate fraction was 13C-depleted (−29‰ and had a C : N ratio of ~ 8, which indicated that POM originated from phytoplankton production in the reservoir and in the floodplain, rather than from plant debris or resuspended sediments. While the upstream dam had little effect on the DOM pool, terrestrial particles were retained, and POM from algal and microbial sources was released to the river. A nitrogen mass balance over the 2200 km2 flooded area revealed an annual deficit of 15 500–22 100 t N in

  6. Organic carbon and nitrogen export from a tropical dam-impacted floodplain system

    Directory of Open Access Journals (Sweden)

    R. Zurbrügg

    2012-06-01

    Full Text Available Tropical floodplains play an important role in organic matter transport, storage, and transformation between headwaters and oceans. However, the fluxes and quality of organic carbon (OC and organic nitrogen (ON in tropical river-floodplain systems are not well constrained. We explored the quantity and characteristics of dissolved and particulate organic matter (DOM and POM in the Kafue River flowing through the Kafue Flats (Zambia. The Kafue Flats are a tropical dam-impacted river-floodplain system in the Zambezi River basin. During the flooding season, >80% of the Kafue River water passed through the floodplain, mobilizing large quantities of OC and ON, which resulted in a net export of 75 kg OC km−2 d−1 and 2.9 kg ON km−2 d−1, 80% of which was in the dissolved form. Mass budget estimates showed that ON export, denitrification, and burial caused an annual deficit of ~21 000 t N yr−1 in the Kafue Flats. A N isotope balance and the δ15N of DON and PON suggest that N-fixation must level out the large N losses. The elemental C:N ratio of ~20, the δ13C values of higher than −24‰, and spectroscopic properties (excitation-emission matrices showed that DOM in the river was mainly of terrestrial origin. Despite a threefold increase in OC loads due to inputs from the floodplain, the river DOM characteristics remained relatively constant along the sampled 400-km river reach. This suggested that floodplain DOM had similar properties than DOM from the upstream reservoir. In contrast, based on its low δ13C of −29‰ and the C:N ratio of ~8, POM originated from phytoplankton production in the upstream reservoir and in the floodplain. While the reservoir had little impact on DOM properties, terrestrial POM was efficiently trapped and, instead, phytoplankton-derived POM was discharged to the downstream Kafue Flats.

  7. Spatially and temporally varying Quaternary uplift rates of the Gerecse Hills, Northern Pannonian Basin, using dated geomorphological horizons in the Danube valley

    Science.gov (United States)

    Ruszkiczay-Rüdiger, Zsófia; Fodor, László; Csillag, Gábor; Braucher, Régis; Kele, Sándor; Novothny, Ágnes; Thamó-Bozsó, Edit; Virág, Attila; Molnár, Gábor; Madarász, Balázs; Aster Team

    2016-04-01

    The assessment of Quaternary vertical deformation rates of uplifted, low altitude hilly regions is based mainly on the dating of paleo-surfaces that can be related to reference levels through several stages of landscape evolution. Regarding the Gerecse Hills (NE part of the Transdanubian Range, Hungary), situated to the south of the incised Danube River the all-time base-level of the river provides a suitable reference level, because the intracontinental setting of the study area makes it insensitive of the global sea level changes. The terrace sequences of the Hungarian part of the Danube valley preserve a record of varying tectonic uplift rates along the river course and throughout several climate stages. The Gerecse Hills consists mainly of Triassic carbonatic rocks and a thin Paleogene and Neogene siliciclastic cover. The Danube is escorted by a set of Quaternary river terraces and higher planation surfaces, which may be of Pliocene age. The terraces are covered by alluvial sediments frequently capped by travertine and/or loess. To establish the chronology of these terraces, we rely on U-series data of travertines and on new in situ produced cosmogenic nuclides data combined with luminescence (OSL and postIR-IRSL) ages from the lower terraces. In situ produced cosmogenic 10Be concentrations were measured in samples distributed along vertical depth profiles to enable the determination of both the exposure duration and the denudation rate at each studied locality. We used Monte Carlo approach to model the denudation rate-corrected exposure ages. Burial age determinations were performed using cosmogenic 26Al/10Be nuclide ratios. Post-IR IRSL measurements were carried out on K-feldspar and OSL measurements on quartz grains to determine the ages of sediment deposition. The highest dated horizon (˜115 m above the river) provided a preliminary burial age of ˜2.7 Ma, which is in accordance with the possible time span of sedimentation deduced from the occurrence of

  8. Simulating post-LGM riverine fluxes to the coastal zone: The Waipaoa River System, New Zealand

    Science.gov (United States)

    Upton, Phaedra; Kettner, Albert J.; Gomez, Basil; Orpin, Alan R.; Litchfield, Nicola; Page, Michael J.

    2013-04-01

    HydroTrend, a climate-driven hydrologic transport model, is used to simulate the suspended sediment discharge of the Waipaoa River System (WRS) over the last 5.5 kyr. We constrain the precipitation input with a paleo-rainfall index derived from the high-resolution Lake Tutira storm sediment record. The simulation is extended to 22 ka using a lower resolution version of the model, constrained by terrestrial and marine paleoenvironment indicators and a simulated model of northeast New Zealand's climate at the Last Glacial Maximum (LGM). Comparison of the 5.5 kyr simulation with the shelf sediment core MD97-2122 suggests that the sediment flux variations observed on the shelf primarily reflect changes in rainfall associated with wetter and drier periods of centuries to millennia duration. Storage of sediment on the Waipaoa River floodplain (Poverty Bay Flats) moderates the signal by reducing the sediment flux reaching the coast. During the LGM conditions were more erosive than the Holocene with tussock and grass dominated vegetation. For erodibility four times the Holocene's and half today's, the LGM Waipaoa River System would have generated approximately half the current sediment yield and about 3 times the amount generated when the catchment was fully forested.

  9. Three new species of Myxobolus Bütschli, 1882 (Myxozoa: Myxobolidae) infecting the common nase Chondrostoma nasus (L.) in the River Danube.

    Science.gov (United States)

    Cech, Gábor; Borzák, Réka; Molnár, Kálmán; Székely, Csaba

    2015-10-01

    The common nase Chondrostoma nasus (L.) is a frequent cyprinid fish in the River Danube. In a survey on its infection with myxosporeans, eight different Myxobolus spp. spore types were found in the gills, swim bladder, fins and intestinal wall. Of these, spore types representing three species were studied in detail by morphological and molecular methods. Based on the differences in 18S rDNA sequences, two new species of Myxobolus Bütschli, 1882 from the gills and one from the swim bladder are described: M. arrabonensis n. sp., M. szentendrensis n. sp. and M. paksensis n. sp. The new species resembled M. muelleri Bütschli, 1882, M. intimus Zaika, 1965 and M. cycloides Gurley, 1893, all parasitic in leuciscine cyprinids, in spore size and location in the host, but exhibited differences in partial 18S rDNA sequences as follows: M. arrabonensis - M. muelleri (1.4%), M. szentendrensis - M. intimus (2.8%), M. paksensis - M. cycloides (2.4%). Based on the significant differences in rDNA sequences, the three forms are considered to represent new, hitherto undescribed species in spite of their morphological similarities to some Myxobolus spp. forming spores in identical locations in genetically closely related cyprinids of the subfamily Leuciscinae.

  10. Structure and seasonal dynamics of the protozoan community (heterotrophic flagellates, ciliates, amoeboid protozoa) in the plankton of a large river (River Danube, Hungary).

    Science.gov (United States)

    Kiss, Aron Keve; Acs, Eva; Kiss, Keve Tihamér; Török, Júlia Katalin

    2009-05-01

    Seasonal dynamics of all major protozoan groups were investigated in the plankton of the River Danube, upstream of Budapest (Hungary), by bi-weekly sampling over a 1-year long period. Sixty-one heterotrophic flagellate, 14 naked amoeba, 50 testate amoeba, 4 heliozoan and 83 ciliate morphospecies were identified. The estimated abundance ranges of major groups throughout the year were as follows: heterotrophic flagellates, 0.27-7.8 x 10(6)ind.l(-1); naked amoebae, max. 3300ind.l(-1); testaceans, max. 1600ind.l(-1); heliozoans, max. 8500ind.l(-1); ciliates, 132-34,000ind.l(-1). In terms of biovolume, heterotrophic flagellates dominated throughout the year (max. 0.58mm(3)l(-1)), and ciliates only exceeded their biovolume in summer (max. 0.76mm(3)l(-1)). Naked amoeba and heliozoan biovolume was about one, and testacean biovolume 1-3, orders of magnitude lower than that of ciliates. In winter, flagellates, mainly chrysomonads, had the highest biomass, whilst ciliates were dominated by peritrichs. In 2005 from April to July a long spring/summer peak occurred for all protozoan groups. Beside chrysomonads typical flagellates were choanoflagellates, bicosoecids and abundant microflagellates (large chrysomonads and Collodictyon). Most abundant ciliates were oligotrichs, while Phascolodon, Urotricha, Vorticella, haptorids, Suctoria, Climacostomum and Stokesia also contributed significantly to biovolume during rapid succession processes. In October and November a second high protozoan peak occurred, with flagellate dominance, and slightly different taxonomic composition.

  11. Application of biological markers for the identification of oil-type pollutants in recent sediments: Alluvial formation of the Danube river, Oil refinery Pančevo

    Directory of Open Access Journals (Sweden)

    Rašović Aleksandar S.

    2002-01-01

    Full Text Available The purpose of this paper was to examine to which extent the abundance and distribution of certain biological markers may be used for the identification of oil-type pollutants in recent sediments and ground waters. The samples were taken from the area of the Oil Refinery Pančevo (alluvial formation of the Danube River. The organic matter of the investigated samples was isolated using an extraction method with chloroform. The group composition and usual biological markers were analyzed in the obtained extracts. n-Alkanes and acyclic isoprenoids, pristane and phytane were analyzed using gas chromatographie (GC analysis of saturated hydrocarbons. Polycyclic alkanes of the sterane and terpane type were analyzed using gas chromatography-mass spectrometry (GC-MS, i.e. by analyzing the carbamide non-adduct of the total alkane fraction (Single Ion Monitoring SIM-technique. The obtained results indicate that n-alkanes can be used for the identification of oil-type pollutants (for example, if the oil-pollutant is biodegraded or present in very low concentrations, and steranes and triterpanes can be used as very reliable indicators of oil-type pollution in recent sediments and ground waters.

  12. QUANTITATIVE AND QUALITATIVE EVALUATION OF ICHTHYOPLANKTON IN THE ROSCI0066 DANUBE DELTA - THE MARIN AREA SITE – A CASE STUDY IN VERNAL SEASON 2012

    Directory of Open Access Journals (Sweden)

    Carmen Georgeta Nicolae

    2014-06-01

    Full Text Available Ichthyoplankton are the eggs and larvae of fish and is a component of the trophic spectrum of different consumers, but also is a new ichtyofauna for aquatic ecosystem. To assess the qualitative and quantitative structure of the ichthyoplankton in ROSCI0066 site, in vernal season 2012, the samples were collected using Bongo net in six stations (Sfantu Gheorghe, Zaton, Sahalin, Periteasca, Sulina, Portita. For each particular station were recorded the data like: date when the sample was taken; the geographical coordinates of the station; water depth (m; the number of revolutions of the net. The biological samples were stored in 4% formaldehyde and analyzed in the laboratory. To estimate the number of spawn and larvae per m2 was used Tanaka's formula, by taking into consideration: the sampling depth, the surface net, the number of revolutions of the flow meter, the volume of filtered water (m3, number of spawn or larvae collected. Ichthyoplankton results are expressed in number of individuals/sample and individuals m-2 and for juveniles in numbers/trawling and individuals m-2. In the ROSCI0066 Danube Delta - the Marin Area site, in vernal season 2012, it is found that the diversity of species in the samples analyzed is very low, being identified only four species of fish from the Engraulidae, Clupeidae, Mullidae and Gobiidae families. According to the results, sprat prefers the south of the Romanian Black Sea coast and is prevalent in evidence by the presence of eggs and anchovy by the presence of larvae.

  13. THE RESPONSE OF BENTHIC MACROINVERTEBRATE AND FISH ASSEMBLAGES TO HUMAN IMPACT ALONG THE LOWER STRETCH OF THE RIVERS MORAVA AND DYJE (DANUBE RIVER BASIN, CZECH REPUBLIC

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    Zdeněk Adámek

    2013-10-01

    Full Text Available The lower Morava and Dyje rivers belong among the large lowland rivers on the southeast of the Czech Republic flowing into the Danube 69 km downstream of their confluence. Despite their high nature value and environment protection, both rivers suffered from heavy pollution from the sixties to the eighties of the last century. Significant improvement of their water quality during the last two decades resulted in the partial recovery of former assemblages of both benthic macroinvertebrates and fish. Recently, altogether 262 and 137 taxa of macrozoobenthos were recorded at the Dyje and Morava rivers, respectively. In the River Dyje, 3 and 21 non-native and threatened (according to IUCN categories invertebrate species, respectively, were ascertained, whilst in the River Morava their numbers were 2 and 10, respectively. The fish assemblage consisted of 23 and 24 species, respectively, plus one hybrid in each of the rivers, bleak being by far the most abundant fish. In the sections under study, several rare and/or protected species were also recorded. Two of them, ide (Leuciscus idus and burbot (Lota lota belong among vulnerable fish species and four others, white-eye bream (Abramis sapa, striped ruffe (Gymnocephalus schraetser, streber (Zingel streber and zingel (Zingel zingel, are considered as critically endangered species. Currently, both lower stretches of the rivers Morava and Dyje have been heavily invaded by round goby, Neogobius melanostomus.

  14. MODIS-based multi-parametric platform for mapping of flood affected areas. Case study: 2006 Danube extreme flood in Romania

    Directory of Open Access Journals (Sweden)

    Craciunescu Vasile

    2016-12-01

    Full Text Available Flooding remains the most widely distributed natural hazard in Europe, leading to significant economic and social impact. Earth observation data is presently capable of making fundamental contributions towards reducing the detrimental effects of extreme floods. Technological advance makes development of online services able to process high volumes of satellite data without the need of dedicated desktop software licenses possible. The main objective of the case study is to present and evaluate a methodology for mapping of flooded areas based on MODIS satellite images derived indices and using state-of-the-art geospatial web services. The methodology and the developed platform were tested with data for the historical flood event that affected the Danube floodplain in 2006 in Romania. The results proved that, despite the relative coarse resolution, MODIS data is very useful for mapping the development flooded area in large plain floods. Moreover it was shown, that the possibility to adapt and combine the existing global algorithms for flood detection to fit the local conditions is extremely important to obtain accurate results.

  15. Attitudes and Prerequisites for the Establishment of an Integrated Cultural Identity within Romanian-Bulgarian Cross-Border Region along the Danube River

    Directory of Open Access Journals (Sweden)

    Juliana Popova

    2013-08-01

    Full Text Available Objectives: On the basis of the results from an empirical study this research aims at exploration of the prerequisites for the establishment of an integrated cultural identity within Romanian-Bulgarian Cross-Border Region along the Danube River (RBCBR. Prior Work: The paper is trying to prove the necessity of identity re-negotiation process within RBCBR. The theoretical background of the research is related to some of the most topical considerations in this scientific field. Approach: The research uses an interdisciplinary approach and combines the perspectives of regional studies, cross-cultural psychology and intercultural communication. A representative survey is the main instrument of the research. Results: Among the citizens of the RBCBR there exist favourable attitudes towards closer relations with their neighbours which can serve as a key element of the identity re-negotiation process within the region. Implications: The research results can be used by policy makers and regional authorities in the process of establishment of a new policy for territorial cooperation as well as by researchers in further development of this topic area. Value: the importance of the research is in its new approach towards the establishment of integrated regional identity as well as in the comparison of the Romanian and Bulgarian attitudes towards cooperation in the neighbourhood area.

  16. Macroinvertebrates and fishes in the part of the Danube flowing through the Iron Gate national park and possibilities of their protection under in situ and ex situ conditions

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    Simić Vladica M.

    2004-01-01

    Full Text Available Comparison of the results of later investigations of the Danube in the part flowing through in the Iron Gate (Đerdap National Park with those of research conducted earlier (20 to 40 years ago shows that changes have occurred in regard to the presence and especially the abundance of certain hydrobionts on this sector of the river, a finding that applies to all groups examined. The paper discusses the potential and results of conservation measures realized through both legal regulations and medium-term plans for the advancement of fishing in this region. In addition to in situ study during the period from 1999 to 2003, a large number of species (especially of macroinvertebrates and fish were also investigated under artificial conditions (in the Kragujevac Aquarium in order to gain a better understanding of their ecological characteristics, especially their sensitivity to various environmental stress factors. The presented results indicate that weight of specimens and success of culturing under ex situ conditions are correlated with their sensitivity under natural conditions.

  17. Criteria of sustainable management of large river systems – ecological aspects and challenges of the 21st century

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    Guti, Gábor

    2014-06-01

    Full Text Available River systems maintain unique biotic resources and provide essential renewable water supplies for humankind. Flood pulses are the key natural drivers of species richness and productivity of the large river-floodplain ecosystems, but traditional water management has sought to reduce the natural variability of river flows to achieve more stable water supplies for socio-economic water needs. The increasing human pressure on river systems directly threatens the biodiversity of fluvial ecosystems across the world. Ecologically sustainable river management is aimed at maintaining the ecological integrity of the affected ecosystems while meeting the intergenerational human needs and sustaining the full array of other goods and services provided by natural river ecosystems. Several criteria of ecologically sustainable water management are outlined, such as the assessment of the reference status, the documentation of the deficiencies of the baseline conditions, the identification of the causes of ecosystem degradation using the DPSIR framework, the analysis of the compatibility of water needs, the definition of the target vision, etc.

  18. River sinuosity changes as indicators of the possible neotectonic activity - a case study on the Danube River between Paks (Hungary) and Beograd (Serbia)

    Science.gov (United States)

    Petrovszki, Judit

    2010-05-01

    The meandering, pre-regulation river planforms of the Danube River, between Paks (Hungary) and Beograd (Serbia) was digitized from the map sheets of the Second Military Survey of the Habsburg Empire (Timár et al., 2006). These maps were surveyed before or simultaneously with the river control works, so it is possible to follow the natural riverbeds, the natural changing of the meandering structure. The sinuosity values were calculated with different window sizes, and displayed in a spectrum-like diagram (sinuosity spectra; after van Balen et al., 2008). The channel sinuosity of this river is analyzed in order to draw conclusions on the neotectonic activity of the western part of the Great Hungarian Plain. Several points of sinuosity change were identified. To prove that these are of neotectonic origin, a neotectonic map and seismic sections crossing the study area, were also analyzed. Significant sinuosity changes (low to high or high to low), spatially correlated to linear features identified in seismic survey sections or in tectonic maps (Horváth et al., 2006), indicate their neotectonic activity (Ouchi, 1985; Timár, 2003; Zámolyi et al., 2010). Upstream of the Hungarian-Serbian border, the Duna (Danube) has anabranching planform, the Baracskai-Duna is the main anabranch. There is a fault on the neotectonic map, crossing both rivers, and cause the decreasing of the sinuosity. The vertical activity of the structural line, which is more or less parallel to the international border, is verified by the sinuosity change. The direction of the change (from high to low sinuosity values) correlates with the normal fault character, shown on the map. Another significant sinuosity change occurs downstream of the Drava River confluence. The explanation of this change can be of two kinds. First, there is a known tectonic feature along the Drava River, with dextral faulting. The sinuosity increase could indicate a small active vertical component of this structural line

  19. Reconstruction of the Late Holocene river channel shifts in the North-Eastern part of the Lower Danube Plain based on historical data

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    Ionuț-Alexandru CRISTEA

    2014-11-01

    Full Text Available Several periods of increased fluvial activity and accelerated runoff / deposition have been identified during the Holocene in different regions of Europe (Macklin et al, 2006. According to Starkel (2002 the older phases were characterized by an incision of deeper and wider tracks and, since Roman period, especially during the past millennium, tendency had changed to aggradation, braiding and river avulsions. The turn to a more stable fluvial regime caused further incisions and the development of narrow and smaller meanders. All these fluvial responses can be mainly correlated with the climatic fluctuations (cooler and wetter phases alternating with drier and warmer ones, socio-economic changes (increased anthropic pressure or both. The last major period of concentration of extreme meteorological and hydrological events is the Little Ice Age (LIA, which conventionally took place between the 16th and mid 19th century (Lamb, 1984. However in Romania the study of LIA and the associate fluvial effects is rather poor. The data regarding hydro-climatological events (weather conditions, floods in the medieval period (mostly collected by Topor, 1960 is scarce and based on the few local chronicles and diaries of the foreign travelers. However these confirm the increased frequency and magnitude of the rainfalls in the summer (with several important peaks in the 1590 – 1690 interval as well as the hard winters well documented for the rest of the continent. Changes in the configuration of the stream network, due to avulsions, can be evaluated based on historical maps only with the first half of the 17th century and the dating of the fluvial records is still missing.The North-Eastern part of the Lower Danube Plain (Fig. 1 is a large alluvial floodplain where Siret River collects several major tributary streams draining SE Carpathians (Putna, Râmnicu Sărat, Buzău or the Moldavian Tableland (Bârlad, before joining Danube, near Galaţi. Surprisingly Siret

  20. Applying of Indicator Vertebrate Species to Environmental Assessment in the Landscape: Danube – Oder – Elbe Water Canal in the Czech Republic

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    Poprach Karel

    2016-11-01

    Full Text Available The aim of the study is to assess potential impact of construction of the Danube - Oder - Elbe (DOL water canal on populations of vertebrate species - amphibians, reptiles, birds and mammals - and present using these species as bioindicators on landscape level. For analysis of the data, the canal route was divided into smaller sections which were assessed separately. The following criteria were analysed: 1 current occurrence of target vertebrate species, 2 identification of species affected by canal construction, including evaluation of their numbers, 3 identification of affected species protected by Czech legislation, 4 identification of affected species protected by EU legislation, 5 impact assessment of the DOL project on Special Protection Areas (SPAs and Special Areas of Conservation (SACs, 6 data synthesis and impact assessment of the DOL vertebrates in the particular catchment areas. It is apparent that the most important negative impacts on vertebrate populations and their habitats in case of implementation of the DOL plan can be expected in the following sections of the Morava river: Hodonín - Břeclav, Kroměříž - Otrokovice, Veselí na Moravě - Hodonín, Troubky - Kroměříž, Doubravice - Střelice; of the Oder river: Jeseník nad Odrou - Ostrava, Ostrava - state border; and of the Elbe river: Česká Třebová - Pardubice. In case of construction of the DOL canal, disturbance, damage or loss of vertebrate habitats will occur at least at 6 out of 9 studied sections in the Morava catchment area, at 3 of 4 sections in the Oder catchment area and at 2 of 3 sections in the Elbe catchment area.

  1. Mapping differential elemental accumulation in fish tissues: assessment of metal and trace element concentrations in wels catfish (Silurus glanis) from the Danube River by ICP-MS.

    Science.gov (United States)

    Jovičić, Katarina; Nikolić, Dragica M; Višnjić-Jeftić, Željka; Đikanović, Vesna; Skorić, Stefan; Stefanović, Srđan M; Lenhardt, Mirjana; Hegediš, Aleksandar; Krpo-Ćetković, Jasmina; Jarić, Ivan

    2015-03-01

    Studies of metal accumulation in fish are mainly focused on the muscle tissue, while the metal accumulation patterns in other tissues have been largely neglected. Muscle is not always a good indicator of the whole fish body contamination. Elemental accumulation in many fish tissues and organs and their potential use in monitoring programs have not received proper attention. In the present study, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, and Zn concentrations were assessed by inductively coupled plasma mass spectrometry (ICP-MS) in the following 14 tissues of the wels catfish (Silurus glanis) from the Danube River: muscle, gills, spleen, liver, kidneys, intestine, gizzard, heart, brain, gallbladder, swim bladder, vertebra, operculum, and gonads. A high level of differential elemental accumulation among the studied tissues was observed. The maximum overall metal accumulation was observed in the vertebra, followed by the kidneys and liver, with the metal pollution index (MPI) values of 0.26, 0.25, and 0.24, respectively. The minimum values were observed in the gallbladder, muscle, brain, and swim bladder, with MPI values of 0.03, 0.06, 0.07, and 0.09, respectively. Average metal concentrations in the fish muscle were below the maximum allowed concentrations for human consumption. The mean As, Cd, Pb, Cu, Fe, and Zn concentrations in the muscle were 0.028, 0.001, 0.001, 0.192, 3.966, and 3.969 μg/g wet weight, respectively. We believe that the presented findings could be of interest for the scientific community and freshwater ecosystem managers. There is a need for further research that would assess less studied tissues in different fish species.

  2. Transmission Dynamics of the West Nile Virus in Mosquito Vector Populations under the Influence of Weather Factors in the Danube Delta, Romania.

    Science.gov (United States)

    Cotar, Ani Ioana; Falcuta, Elena; Prioteasa, Liviu Florian; Dinu, Sorin; Ceianu, Cornelia Svetlana; Paz, Shlomit

    2016-12-01

    Mosquitoes were collected in the Danube Delta during the active seasons of 2011-2013. For Culex spp. mosquitoes, the abundance was calculated. Culex pipiens (sensu lato), (s.l.) and Culex modestus pools were tested for the presence of West Nile virus (WNV) genome, and the maximum likelihood of the infection rate was established. Mean daily temperatures and precipitation were obtained for the closest meteorological station. A negative binominal model was used to evaluate linkages between the temperature/precipitation and mosquito population size. A zero-inflated negative binomial model was used to test the relationship between the temperature and the infection rate. A single complex model for infection rate prediction was also used. The linkages were calculated for lag 0 and for 10 days earlier (lag 1), 20 days earlier (lag 2), and 30 days earlier (lag 3). Significant positive linkages (P < 0.001) were detected between temperature and mosquito population size for lag 1, lag 2, and lag 3. The linkages between temperature and infection rates were positive and significant for lag 2 and lag 3. Negative significant (P < 0.001) results were detected between precipitation and infection rates for lags 1, 2, and 3. The complex model showed that the best predictors for infection rate are the temperature, 20 days earlier (positive linkage) and the precipitation, 30 days earlier (negative linkage). Positive temperature anomalies in spring and summer and rainfall decrease contributed to the increase in the Culex spp. abundance and accelerated the WNV amplification in mosquito vector populations in the following weeks.

  3. Identifying external influences on discharge time series: Long term variability of the Danube River flow and its relation to precipitation and temperature

    Science.gov (United States)

    Szolgayová, Elena; Blöschl, Günter; Bucher, Christian

    2013-04-01

    Studies analysing the impact of climate related drivers, such as precipitation and temperature on discharge have become widely popular in the past years. It is especially interesting to see the impact of these factors from the long term perspective and the influence of these drivers on possible long range dependence in the discharge time series. In this work we use cross - wavelet analysis in order to improve the understanding of interdependencies between discharge and the above named climate related drivers and to observe the long term variability of the river flows and its relation to temperature and precipitations. Analysis of the cross - wavelet spectra thus can help to explain the influence of the specific geographical conditions of the region on the discharge. Using the cross - wavelets thus helps to explain the long term behaviour and long range dependence in discharge from the process point of view. Such analysis obviously has to be done case based, observing the interaction between the discharge and the respective driver for different frequency intervals at different periods in time for a discharge gauging station separately. We consider daily and monthly discharge time series from five discharge gauging stations of the Danube River in Germany, Austria and Slovakia and the areal average precipitation over their catchments and temperature time series for the respective discharge gauge. The cross - wavelets are used to analyze the general impact of precipitation on discharge using generated discharge and precipitation data in each station. A simple dual kernel convolution model is used to generate discharge from precipitation. From thus obtained data sets the cross - wavelet spectra are constructed and analysed in order to understand how does precipitation influence discharge, especially in the lower frequencies. The influence of different behavioral patterns in precipitation (simulating possible different physiographic conditions in the catchment), such as

  4. Evaluation of the flood-pulse concept based on statistical models of growth of selected fishes of the upper Mississippi River system

    Science.gov (United States)

    Gutreuter, S.; Bartels, A.D.; Irons, K.; Sandheinrich, M.B.

    1999-01-01

    The flood-pulse concept (FPC) states that annual inundation is the principal force responsible for productivity and biotic interactions in river-floodplain systems. Somatic growth is one component of production, and we hypothesized that, if the FPC applies, growth of fishes that use the moving littoral zone should differ among years with differing flood pattern, whereas nonlittoral fishes would show no such response. Growth of largemouth bass (Micropterus salmoides) and bluegill (Lepomis macrochirus), species that exploit littoral resources, increased during a year having an unusual warm-season flood in the Upper Mississippi River system and was reduced during low-water years. Growth of white bass (Morone chrysops), which do not rely heavily on the littoral zone, did not differ significantly between the extreme-flood and low-water years. Patterns of growth of black crappie (Pomoxis nigromaculatus), which have intermediate dependence on the moving littoral zone, were somewhat ambiguous. These results are consistent with the hypothesis that the FPC applies, at least under certain conditions, to this temperate river system. Our results can also provide an important basis from which to assess some costs and benefits of water level management strategies in large regulated temperate rivers.

  5. Air-Sea Fluxes and River Discharges in the Black Sea With a Focus on the Danube and Bosphorus

    Science.gov (United States)

    2008-01-01

    ANSI Std Z39.18 Available online at www.sciencedirect.com ELSEVIER ScienceDirect Journal of Marine Systems 74 (2008) 74 95 J () li R N A 1...response to the annual 20090306221 Ill Karaetal. / Journal of Marine Systems 74 iJ(H)S) 74 95 ’> cycle of buoyancy fluxes at the sea surface (e.g...al. Journal of Marine Systems 74 COOS) 74 l>5 is to discuss monthly and annual mean river flow values discharged into the Black Sea as

  6. Floodplain restoration on the upper Danube by re-establishing back water dynamics: first results of the hydro-geomorphological monitoring

    Science.gov (United States)

    Fischer, Peter; Hilger, Ludwig; Cyffka, Bernd

    2013-04-01

    Within the framework of a restoration project at the upper Danube, eight working groups of different scientific disciplines have been operating since 2009. They investigate the changes evoked through the accomplished restoration measures, which seek to bring back new dynamics to the floodplain and to reconnect it with the river in order to optimize flood plain ecological functioning. Main object is the identification and analysis of hydro-geomorphological processes and their impact on vegetation and fauna. Hydrology is one of the key factors determining the type and function of flood plains and thus alternating water levels are the motor of riparian ecosystems. Diverse water and groundwater levels and particularly flood events affect and support floodplain typical vegetation and animal species. All floodplain waterbodies (oxbows, floodplain ponds, backwaters and sidearms) are more or less connected by surface or subsurface waterways. Hydrological conditions are mainly influenced by the following measures: a, permanent nature orientated bypass river with a discharge of up to 5 m3/s; b, man controlled ecological flooding (discharge of up to 30 m3/s); c, groundwater drawdown in the eastern project area. These measures shall bring back "former" natural hydrological dynamics to the floodplain. They establish geomorphological processes and forms as well and create a mosaic of typical habitats. River morphology is monitored by terrestrial laser scanning analysing the so attained data sets, erosion and aggregation rates at selected undercut slopes and point bars can be detected with a high resolution. Large scale mapping by a drone and dGPS mapping are very helpful tools for identifing widespread flooding areas. Further methods such as, cross section and bed load measurements complete the research work. The aim is to link the interaction of these abiotic processes with the biotic nature and determine the importance of geomorphological disturbance for floodplain ecosystems

  7. OpenDanubia - An integrated, modular simulation system to support regional water resource management

    Science.gov (United States)

    Muerth, M.; Waldmann, D.; Heinzeller, C.; Hennicker, R.; Mauser, W.

    2012-04-01

    The already completed, multi-disciplinary research project GLOWA-Danube has developed a regional scale, integrated modeling system, which was successfully applied on the 77,000 km2 Upper Danube basin to investigate the impact of Global Change on both the natural and anthropogenic water cycle. At the end of the last project phase, the integrated modeling system was transferred into the open source project OpenDanubia, which now provides both the core system as well as all major model components to the general public. First, this will enable decision makers from government, business and management to use OpenDanubia as a tool for proactive management of water resources in the context of global change. Secondly, the model framework to support integrated simulations and all simulation models developed for OpenDanubia in the scope of GLOWA-Danube are further available for future developments and research questions. OpenDanubia allows for the investigation of water-related scenarios considering different ecological and economic aspects to support both scientists and policy makers to design policies for sustainable environmental management. OpenDanubia is designed as a framework-based, distributed system. The model system couples spatially distributed physical and socio-economic process during run-time, taking into account their mutual influence. To simulate the potential future impacts of Global Change on agriculture, industrial production, water supply, households and tourism businesses, so-called deep actor models are implemented in OpenDanubia. All important water-related fluxes and storages in the natural environment are implemented in OpenDanubia as spatially explicit, process-based modules. This includes the land surface water and energy balance, dynamic plant water uptake, ground water recharge and flow as well as river routing and reservoirs. Although the complete system is relatively demanding on data requirements and hardware requirements, the modular structure

  8. The role of vegetated areas on fish assemblage of the Paraná River floodplain: effects of different hydrological conditions

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    Juan José Neiff

    Full Text Available In this paper, we analyze the changes in composition and abundance of fish assemblages in seven vegetated floodplain wetlands with different connectivity across different hydrologic conditions: after a prolonged connection of the floodplain with the main channel, during receding water, and after a prolonged isolation. We also investigated the size and abundance of large-sized migratory species found in these wetlands and the food resources exploited by the dominant fish. Fishes were captured by diurnal seining (8.0 m x 1.50 m, 5 mm mesh along macrophyte banks. Despite the high total number of species registered (100, sample species richness varied between 7 and 31, depending on the sampling site and the sampling date. Cluster analysis indicated low similarity between sites during both the isolation and the prolonged connection. Species turnover decreased from high water (β = 40.33 to low water (β = 33.83, with the minimum value of beta diversity index obtained during the isolation of the floodplain wetlands (β = 26.83. Our results indicated that different dominant populations of fish occur in different hydrological conditions, even though high water and isolation phases occur in the same season of different years. The ordination (NMDS indicated the importance of hydrologic conditions in structuring fish assemblages in the studied floodplain. Small-sized characids, typically associated with macrophytes, dominated the fish assemblages, whereas the younger stages of large sized migratory species were found in low abundance. The maximum standard length of the fish captured was 28 cm and for large migratory fish, standard length varied between 1.6 and 25.0 cm. The dominant fish used several food resources, but littoral macrophytes-associated organisms had a high frequency of occurrence in the three hydrologic conditions. The high species richness of fish in the small, vegetated lakes was related to the high spatial heterogeneity during different hydrological conditions. Disturbances in the hydrological pulses could reduce the biodiversity by modifying the connectivity of the floodplain with the river channel. Conservation of these vegetated wetlands requires maintenance of actual width range of connectivity that provide diverse habitat along the time.

  9. Economic analysis of temperature reduction in a large river floodplain: An exploratory study of the WIllamette River, Oregon

    Science.gov (United States)

    This paper examines ecosystem restoration practices that focus on water temperature reductions in the upper mainstem Willamette River, Oregon, for the benefit of endangered salmonids and other native cold-water species. The analysis integrates hydrologic, natural science and eco...

  10. Environmental education in the Upper Paraná River floodplain, municipality of Porto Rico (Paraná State, Brazil

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    AT. Obara

    Full Text Available Since 2003, researchers, faculty, graduate and undergraduate students from the State University of Maringá have been working alongside teachers from the state and local schools in the municipality of Porto Rico (Paraná State, located on the banks of the Paraná River. Their objective is to outline actions and strategies with the purpose of building methodological paths to insert environmental education into the school curriculum. Based on the action-research methodology, the group has developed the following programs: a the Continuing Education Program in Environmental Education; b the Development of Interdisciplinary Projects; c the Insertion of Information and Communication Technologies (ICTs; and d the Production of Teaching Materials. The evaluations of the programs indicate that teachers have been able to gradually build a theoretical and methodological basis for environmental education while simultaneously growing into the role of teacher-researchers as they create the conditions to investigate their pedagogical practices, reflect upon them, share experiences, innovate, and make the teaching-learning process more significant. Allied to the advances in educational practices and with the aid of ICTs, the activities developed in the classroom, in the field and in the lab - all of which involve natural and cultural aspects of the region - have contributed to teachers' and students' better understanding of the ecological, cultural, social and economic value of the floodplain, and consequently, of the importance of preservation and management in order to maintain local biodiversity.

  11. Agriculture and the promotion of insect pests: rice cultivation in river floodplains and malaria vectors in The Gambia

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    Louca Vasilis

    2009-07-01

    Full Text Available Abstract Background Anthropogenic modification of natural habitats can create conditions in which pest species associated with humans can thrive. In order to mitigate for these changes, it is necessary to determine which aspects of human management are associated with the promotion of those pests. Anopheles gambiae, the main Africa malaria vector, often breeds in rice fields. Here the impact of the ancient practice of 'swamp rice' cultivation, on the floodplains of the Gambia River, on the production of anopheline mosquitoes was investigated. Methods Routine surveys were carried out along 500 m transects crossing rice fields from the landward edge of the floodplains to the river during the 2006 rainy season. Aquatic invertebrates were sampled using area samplers and emergence traps and fish sampled using nets. Semi-field experiments were used to investigate whether nutrients used for swamp rice cultivation affected mosquito larval abundance. Results At the beginning of the rainy season rice is grown on the landward edge of the floodplain; the first area to flood with fresh water and one rich in cattle dung. Later, rice plants are transplanted close to the river, the last area to dry out on the floodplain. Nearly all larval and adult stages of malaria vectors were collected 0–100 m from the landward edge of the floodplains, where immature rice plants were grown. These paddies contained stagnant freshwater with high quantities of cattle faeces. Semi-field studies demonstrated that cattle faeces nearly doubled the number of anopheline larvae compared with untreated water. Conclusion Swamp rice cultivation creates ideal breeding sites for malaria vectors. However, only those close to the landward edge harboured vectors. These sites were productive since they were large areas of standing freshwater, rich in nutrients, protected from fish, and situated close to human habitation, where egg-laying mosquitoes from the villages had short distances to fly. The traditional practice of 'swamp rice' cultivation uses different bodies of water on the floodplains to cultivate rice during the rainy season. A consequence of this cultivation is the provizion of ideal conditions for malaria vectors to thrive. As the demand for locally-produced rice grows, increased rice farming will generate great numbers of vectors; emphasizing the need to protect local communities against malaria.

  12. Patterns of food resource use by two congeneric species of piranhas (Serrasalmus on the upper Paraná river floodplain

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    C. S. Agostinho

    Full Text Available Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05, with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

  13. Patterns of food resource use by two congeneric species of piranhas (Serrasalmus on the upper Paraná river floodplain

    Directory of Open Access Journals (Sweden)

    Agostinho C. S.

    2003-01-01

    Full Text Available Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05, with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

  14. Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the Upper Paraná River floodplain.

    Science.gov (United States)

    Agostinho, C S; Hahn, N S; Marques, E E

    2003-05-01

    Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments) and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.

  15. Ecology of endoparasites of the fluvial stingray Potamotrygon falkneri (Chondrichthyes: Potamotrygonidae from the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    ACF. Lacerda

    Full Text Available The present study investigated the ecological relationships between endoparasites and the host Potamotrygon falkneri from the upper Paraná River by using as indicators the host's relative condition factor (Kn, sex and hepatosomatic relation (HSR. Forty-seven specimens of P. falkneri were analyzed between March 2005 and September 2006. Statistical analysis showed that the Kn was positively correlated with the abundance of Acanthobothrium regoi and Rhinebothrium paratrygoni; only the abundance of A. regoi was positively correlated to the HSR, whereas R. paratrygoni did not present correlation and there was no influence of the host's sex on the abundance and prevalence of parasites. This is the first study concerning the ecology of parasites of potamotrygonids.

  16. Inventory of Physical and Cultural Elements, Middle Mississippi River Floodplain (River Reach - St. Louis, Missouri, to Cairo, Illinois)

    Science.gov (United States)

    1975-01-01

    Interior and exterior architectural building, rough construction, flagging, and rubble. 59« Clay. There is little clay available; yet it is important...historical and architectural sites in Illi- nois was obtained from the Illinois Historic Landmarks Survey.* This agency can provide additional...34 gothic rural country house under study for Register. f. MH6 - Ste. Genevieve; entire town is a National Historic Landmark. £. MH7 - Important area

  17. Influence of deposition of fine plant debris in river floodplain shrubs on flood flow conditions - The Warta River case study

    Science.gov (United States)

    Mazur, Robert; Kałuża, Tomasz; Chmist, Joanna; Walczak, Natalia; Laks, Ireneusz; Strzeliński, Paweł

    2016-08-01

    This paper presents problems caused by organic material transported by flowing water. This material is usually referred to as plant debris or organic debris. Its composition depends on the characteristic of the watercourse. For lowland rivers, the share of the so-called small organic matter in plant debris is considerable. This includes both various parts of water plants and floodplain vegetation (leaves, stems, blades of grass, twigs, etc.). During floods, larger woody debris poses a significant risk to bridges or other water engineering structures. It may cause river jams and may lead to damming of the flowing water. This, in turn, affects flood safety and increases flood risk in river valleys, both directly and indirectly. The importance of fine plant debris for the phenomenon being studied comes down to the hydrodynamic aspect (plant elements carried by water end up on trees and shrubs, increase hydraulic flow resistance and contribute to the nature of flow through vegetated areas changed from micro-to macro-structural). The key part of the research problem under analysis was to determine qualitative and quantitative debris parameters and to establish the relationship between the type of debris and the type of land use of river valleys (crop fields, meadows and forested river sections). Another problem was to identify parameters of plant debris for various flow conditions (e.g. for low, medium and flood flows). The research also included an analysis of the materials deposited on the structure of shrubs under flood flow conditions during the 2010 flood on the Warta River.

  18. Control of reed canarygrass promotes wetland herb and tree seedling establishment in an upper Mississippi River Floodplain forest

    Science.gov (United States)

    Thomsen, Meredith; Brownell, Kurt; Groshek, Matthew; Kirsch, Eileen

    2012-01-01

    Phalaris arundinacea (reed canarygrass) is recognized as a problematic invader of North American marshes, decreasing biodiversity and persisting in the face of control efforts. Less is known about its ecology or management in forested wetlands, providing an opportunity to apply information about factors critical to an invader's control in one wetland type to another. In a potted plant experiment and in the field, we documented strong competitive effects of reed canarygrass on the establishment and early growth of tree seedlings. In the field, we demonstrated the effectiveness of a novel restoration strategy, combining site scarification with late fall applications of pre-emergent herbicides. Treatments delayed reed canarygrass emergence the following spring, creating a window of opportunity for the early growth of native plants in the absence of competition from the grass. They also allowed for follow-up herbicide treatments during the growing season. We documented greater establishment of wetland herbs and tree seedlings in treated areas. Data from small exclosures suggest, however, that deer browsing can limit tree seedling height growth in floodplain restorations. Slower tree growth will delay canopy closure, potentially allowing reed canarygrass re-invasion. Thus, it may be necessary to protect tree seedlings from herbivory to assure forest regeneration.

  19. Analysis of the Evolution for the Main Economic and Financial Indicators and the Risk of Bankruptcy for a Company who is the most Modern Maritime - River Port on the Danube, in the Period 2009-2013

    Directory of Open Access Journals (Sweden)

    Rodica Pripoaie

    2015-08-01

    Full Text Available This work presents the evolution for the main economic and financial indicators and the risk of bankruptcy for a company who is the most modern maritime - river port on the Danube, in the period 2009-2013. The evolution of the main economic and financial indicators in the last years 2009- 2013 is very dramatic, because Net profit margin (% decreased from 65.76% in 2009 at 9.93% in 2013 and after tax ROE (Return on Equity decreased from 6.69% in 2009 at 2.93% in 2013, so less than half. Bankruptcy risk has always been very important both for investors, for company managers, and for banking institutions and if this intensifies then it becomes a warning for them. Regression models can be used to explain relationships among economic and financial indicators.

  20. The Question of the Danube Principalities in European Diplomacy of the Second Half of 50’s – 60’s of the XIX-th Century (Based on Materials of the Russian Periodical Press

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    Victor Drozdov

    2013-08-01

    Full Text Available Using materials of the Russian periodicals the policy of European States toward the question of the Danube Principalities’ union and their political status in the second half of 50’s – 60’s of the XIX-th century was exposed. The attention was accentuated on the Romanian question that was the main component of the Eastern question and played the important role in French, British, Austrian and Russian diplomatic policy after the Eastern War of the 1853–1856. The position of different ideological and political Russian press’ movement (conservative, liberal, slavophile and radical concerning the formation of Romanian statement and the European diplomacy in this question was analyzed.

  1. Distribution and accumulation of elements (As, Cu, Fe, Hg, Mn, and Zn) in tissues of fish species from different trophic levels in the Danube River at the confluence with the Sava River (Serbia).

    Science.gov (United States)

    Subotić, S; Višnjić Jeftić, Ž; Spasić, S; Hegediš, A; Krpo-Ćetković, J; Lenhardt, M

    2013-08-01

    Pikeperch (Sander lucioperca), European catfish (Silurus glanis), common carp (Cyprinus carpio), and gobies (Neogobius gymnotrachelus, Neogobius melanostomus) were collected from the Danube River (Belgrade section), and samples of liver, muscle, or whole-body composites (in the case of gobies) were analyzed for As, Cu, Fe, Hg, Mn, and Zn with inductively coupled plasma optical spectrometry to find out if there was a correlation between accumulation of these elements in predatory and prey species, as well as in pairs of species with overlapping diets. Concentrations of all analyzed elements were either higher (Cu, Fe, Mn, Zn) in liver than in muscle, or equal (As, Hg), except for Hg in carp, which was higher in muscle. Mercury concentration in liver and muscle of predators (catfish, pikeperch) was significantly (<10(-4)) higher than in prey fishes (carp and gobies). The results indicate that Hg concentration was biomagnified through the food chain. Concentrations of As, Fe, and Hg in carp liver and gobies whole-body composite were similar, but carp had significantly (<10(-4)) higher values of Zn and Cu in liver. The regression analysis and trendline equations indicate that the concentrations of all tested elements, except for As in liver, and Mn and Fe in muscle, were similar in predatory fish (pikeperch and catfish), on one hand, and in prey fish (carp and gobies), on the other hand. Distinctly high Zn concentration in carp is very common in this species due to its physiology. Concentrations of Hg and Zn were higher than the maximum acceptable concentration due to the high pollution level in this section of the Danube River, accordingly posing a risk for the human consumption of these fish species.

  2. Do the ticks of birds at an important migratory hotspot reflect the seasonal dynamics of Ixodes ricinus at the migration initiation site? A case study in the Danube Delta.

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    Attila D Sándor

    Full Text Available Migratory birds play important roles as distributors of ticks within and between continents. In the Old World, the most important migratory route of birds links Asia, Europe and Africa. During their migration, birds use various stopover sites, where they feed and rest and where ticks may attach or detach, creating new natural foci for vector-borne diseases. Danube Delta is one of the most important migration hotspots and so far no studies were focused on ticks of migratory birds herein. The aim of the present study was to assess the species diversity and seasonal dynamics of ticks parasitizing migratory birds in Danube Delta Biosphere Reserve. Migratory birds were trapped on Grindul Lupilor (44°41'N; 28°56'E using mist nets during 4 migratory seasons (2 spring and 2 autumn in 2011 and 2012. From each bird, all the ticks were collected and identified based on morphological features. Epidemiological parameters (prevalence, mean abundance, mean intensity were calculated and all data were analysed statistically based on the season (spring and autumn, regional status of birds (migrants and breeding and foraging behaviour (ground feeders, reed-bed feeders, foliage feeders. A total of 1434 birds (46 species were captured. Ticks were found on 94 birds (10 species. Significantly more migratory birds hosted ticks, compared to resident birds. The 400 collected ticks belonged to four species: Ixodes ricinus (92.25%, I. arboricola (6.25%, I. redikorzevi (1.00% and Haemaphysalis punctata (0.50%. A higher prevalence was found for I. ricinus in spring, with higher prevalence of nymphs in this season, while larvae occurred with the same prevalence in both seasons. Larval intensity was higher during spring and nymphs were more abundant during autumn. The seasonal differences in our study may be related not to the local seasonal dynamics of ticks, but on the seasonal dynamics at the site of migration initiation.

  3. Landscape ecology of the Upper Mississippi River System: Lessons learned, challenges and opportunities

    Science.gov (United States)

    DeJager, Nathan R.

    2016-03-22

    The Upper Mississippi River System (UMRS) is a mosaic of river channels, backwater lakes, floodplain forests, and emergent marshes. This complex mosaic supports diverse aquatic and terrestrial plant communities, over 150 fish species; 40 freshwater mussel species; 50 amphibian and reptile species; and over 360 bird species, many of which use the UMRS as a critical migratory route. The river and floodplain are also hotspots for biogeochemical activity as the river-floodplain collects and processes nutrients derived from the UMR basin. These features qualify the UMRS as a Ramsar wetland of international significance.Two centuries of land-use change, including construction for navigation and conversion of large areas to agriculture, has altered the broad-scale structure of the river and changed local environmental conditions in many areas. Such changes have affected rates of nutrient processing and transport, as well as the abundance of various fish, mussel, plant, and bird species. However, the magnitude and spatial scale of these effects are not well quantified, especially in regards to the best methods and locations for restoring various aspects of the river ecosystem.The U.S. Congress declared the navigable portions of the Upper Mississippi River System (UMRS) a “nationally significant ecosystem and nationally significant commercial navigation system” in the Water Resources Development Act of 1986 (Public Law 99-662) and launched the Upper Mississippi River Restoration (UMRR) Program, the first comprehensive program for ecosystem restoration, monitoring, and research on a large river system. This fact sheet focuses on landscape ecological studies conducted by the U.S. Geological Survey to support decision making by the UMRR with respect to ecosystem restoration.

  4. New Challenges and Opportunities for Putting into Value the Diversity of the Danube Territorial Capital, as a “European Axis” in light of Bio-Resources Supply during 2030-2050, in the context of Global Demographic Projections for 2100

    Directory of Open Access Journals (Sweden)

    Alexandru Bogdan

    2014-08-01

    Full Text Available Diversity of the Danube territorial capital is the part of World Heritage public investment - biodiversity, environmental protection, sustainable development, reducing poverty and increasing social inclusion, continued development of the global economic welfare, promote a healthy environment, conservation of bio-resources as a ―European Axis‖ , business development in the context of eco-bio-economic, diplomatic instruments promoting eco-bio-economic development, food security, public health, are only several ideas of a smart modern world, which can be attached to development philosophy type ―smart power‖ and contextual intelligence world for Sustainable Development Smart (Smart Sustainable Development by Sustainable Diplomacy Smart (Smart Sustainable Diplomacy in diversity of the Danube territorial capital, which can be a key ingredient of success for Excellence in Foreign Affairs Diplomatic and intelligence dedicated Environmental and Eco- Bio-Economy (SMART & Excellence in Environmental and Eco-Bio-Economic Affairs.

  5. The Analysis of Bankruptcy Risk Using the Normal Distribution Gauss-Laplace in Case of a Company is the Most Modern Romanian Sea-River Port on the Danube

    Directory of Open Access Journals (Sweden)

    Rodica Pripoaie

    2015-08-01

    Full Text Available This work presents the application of the normal distribution Gauss-Laplace in case of a company is the most modern Romanian sea-river port on the Danube, specialized service providers, with a handling capacity of approx. 20,000,000 tons / year. The normal distribution Gauss-Laplace is the most known and used probability distribution, because it surprises better the evolution of economic and financial phenomena. Around the average, which has the greatest frequency, gravitate values more to less distant than average, but with the same standard deviation. It is noted that, although used in the forecasting calculations, analysis of profitability threshold - even ignores the risk of decisional operations (regarding deviations between the forecast and achievements, which may, in certain circumstances, influence much the activity of the company. This can be held into account when carefully studying the evolution of turnover follows a law of probability. In case not exist any information on the law of probability of turnover and no reason that one case appear more than another, according of Laplace law, we consider that these cases are uniformly distributed, therefore they follow a normal distribution.

  6. Bioaccumulation of heavy metals in the zebra mussel Dreissena polymorpha in the rivers Danube and Drau and its role as a bioindicator organism; Schwermetallbelastung von Dreissena polymorpha in Donau und Drau und ihre Bedeutung als Bioindikator

    Energy Technology Data Exchange (ETDEWEB)

    Luschuetzky, E.F. [Univ. Wien, Inst. fuer Zoologie, Abt. fuer Ultrastrukturforschung und Elektronenmikroskopie, Wien (Austria)

    2005-07-01

    Goal and scope. This study was undertaken to investigate the differences in heavy metal burden between the organisms and environmental compartments and to evaluate the role of Dreissena polymorpha as a bioindicator organism. Methods. The concentrations of zinc, copper, cadmium and lead in whole soft body and selected tissues of D. polymorpha at two river habitats in Austria were examined using atomic absorption spectroscopy (AAS). Concentrations in organisms were compared to those in sediment and water. Results and conclusion. Zebra mussels of the river Drau showed generally higher heavy metal concentrations as compared to mussels of the river Danube and contained elevated zinc and cadmium levels as compared to metal concentrations found in soft tissues of zebra mussels from uncontaminated sites in Germany and The Netherlands. The essential metals zinc and copper were mainly accumulated in gills, foot and byssal gland tissue of the mussel, in contrast to the non-essential metals cadmium and lead which were found predominantly in the midgut gland. The heavy metal concentrations in both, sediments and mussel tissue, were higher than in water samples. There was no correlation between the concentrations in water and in the organisms except for zinc. In contrast, correlations were found between concentrations in sediments and mussel soft tissue. Recommendation and perspective. Further investigations should include the examination of sediments and consider the mechanism of food uptake to assess the role of D. polymorpha as a bioindicator organism. (orig.)

  7. La notion de géosite et son pertinence dans une étude sur la région du Défilé du Danube en Roumanie

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    FLORINA GRECU

    2014-10-01

    Full Text Available Cet article a le but de voir en quelle mesure une re cherche des géosites dans la région du Défilé du Danube (Portes de Fer peut donner des ré sultats concrets et satisfaisants. Il analyse, succinctement, les principales caractéristiques géo logiques et géomorphologiques des Portes de Fer et essaye de faire une corrélation avec le term e de géosite comme nous le connaissons aujourd’hui. Après le collapse de l’industrie miniè re, le tourisme est devenu la plus importante alternative économique de cette région. La géologie et la géomorphologie doivent être bien exploités touristiquement et cela est possible seul ement par la création d’un projet qui analyse et met en valeur les géosites de cette région. Ce papie r essaye aussi de souligner les principaux enjeux d’un tel projet.

  8. Potential geo-ecological impacts of the proposed Danube–Oder–Elbe Canal on alluvial landscapes in the Czech Republic

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    Machar Ivo

    2015-06-01

    Full Text Available The project of a canal connecting the three major Central European Rivers: the Danube, Oder and Elbe, is incorporated into a planned trans-European transport network system. Geographically, the course of the planned canal stretches into the territory of four Central European countries, predominantly that of the Czech Republic. The environmental impacts of the potential construction and operation of the Danube–Oder–Elbe (DOE Canal is currently widely discussed by experts from various fields. This paper aims to assess some potential impacts of the canal on the alluvial landscapes in the Czech Republic. The method of geo-ecological assessment presented here applies GIS analyses at the larger landscape scale. The results of the geo-ecological assessment of potential impacts of the DOE Canal on the land-use of river floodplains, the fluvial dynamics of streams and the extent of their alluvial plains, and the quantified DOE Canal impact on protected areas and groundwater sources, are presented. The hydrological impact of the DOE Canal will affect a total of 1,975.4 km2 of river basins in the Czech Republic. The DOE Canal will affect 157 sites significant from the perspective of landscape and nature conservation, 7 nature parks and 113 existing water points which are used as groundwater sources. The results show that the most significant disruption of fluvial dynamics of the stream sediment regime would occur in the Protected Landscape Area of Litovelské Pomoraví. In general, the geo-ecological impact of the DOE Canal on the landscape will be very important.

  9. Limnology in the Upper Paraná River floodplain: large-scale spatial and temporal patterns, and the influence of reservoirs.

    Science.gov (United States)

    Roberto, M C; Santana, N N; Thomaz, S M

    2009-06-01

    Knowledge of abiotic limnological factors is important to monitor changes caused by humans, and to explain the structure and dynamics of populations and communities in a variety of inland water ecosystems. In this study, we used a long term data-set (eight years) collected in 10 habitats with different features (river channels, and connected and isolated lakes) to describe the spatial and temporal patterns of some of the principal limnological factors. In general, the degree of connectivity of the lakes, together with the rivers to which the lakes are connected, were important determinants of their limnological characteristics. These differences are expected, because rivers entering the floodplain come from different geological regions and are subject to different human impacts. At large spatial scales, these differences contribute to the increased habitat diversity of the floodplain and thus to its high biodiversity. With regard to temporal variation, Secchi-disk transparency increased, and total phosphorus decreased in the Paraná River main channel during the last 20 years. Although these changes are directly attributed to the several reservoir cascades located upstream, the closing of the Porto Primavera dam in 1998 enhanced this effect. The increase in water transparency explains biotic changes within the floodplain. The lower-phosphorus Paraná River water probably dilutes concentrations of this element in the floodplain waterbodies during major floods, with future consequences for their productivity.

  10. Diversity, occurrence and feeding traits of caddisfly larvae as indicators for ecological integrity of river-floodplain habitats along a connectivity gradient

    NARCIS (Netherlands)

    Van den Brink, F.W.B.; Van der Velde, G.; Wijnhoven, S.

    2013-01-01

    In order to assess ecological values of Lower Rhine and Meuse floodplain habitats we studied the spatial and seasonal variation in diversity, species assemblages and feeding traits of caddisfly larvae in water bodies over the lateral connectivity gradient: eupotamon: main and secondary channels: par

  11. Subsurface crustacean communities as proxy for groundwater-surface water interactions in the Henares and Tajuña Rivers floodplains, central Spain

    Science.gov (United States)

    Rasines Ladero, Ruben; Iepure, Sanda; Careño, Francisco; de Bustamante, Irene

    2013-04-01

    In the last decades, the linkage between surface water - groundwater via the hyporheic zone and the alluvial floodplains become more and more acknowledged. Hydrological exchanges between the stream and hyporheic zone ensure the transport of matter and energy and provide support for biogeochemical processes occurring in-stream bed sediments. Furthermore, the hyporheic zone is directly linked to permeable alluvial aquifers of which exchanges in both directions ensure the withstanding of a mixt biotic community's that may originate either from the surface benthic habitats or from the shallow aquifer. Data on the subsurface crustacean assemblages are used to infer the surface-groundwater interaction in two-groundwater fed-streams in central Spain. The survey was conducted on 20 hyporheic sites (20-40 cm depth) and 28 shallow or deep boreholes. Multivariate statistics were applied to test for differences in crustacean communities resulting from changes in water chemistry between the upstream and downstream parts of the alluvial aquifer, and between the hyporheic zone and the alluvial aquifer. Our aims were to: 1) test whether groundwater discharges in-stream bed sediments are reflected in changes in the crustacean assemblage's structure; and 2) establish whether the surface water influence decreases with increasing groundwater depth and distance from the river. We further aimed to test whether the diversity-stability ecotonal paradigm associated with the distinct level of disturbances and stability at the interface surface-groundwater and the aquifer is reflected in groundwater crustacean community structure. We start from the assumption that groundwater ecosystems undergo significant changes in space and time, and that classical groundwater stability hypothesis ought to be changed to concepts operative for surface ecosystems: disturbance and resilience. The streams are characterised by distinct gradients of surface-groundwater exchanges at spatial scale, with major interactions at the rivers headwaters compare to the lower part of the alluvial aquifer. The origin of the water in-stream bed sediments is indicated by water chemistry, whereas crustacean communities indicate surface-groundwater exchanges by modifications of the community's structure i.e., upwelling groundwater is indicated by large stygobites populations (obligate groundwater species), whereas downwelling surface waters is usually linked to mixed stygophiles and stygoxene populations. The downwelled surface water flow pattern has detectable influence on increasing nutrient content in shallow hyporheic waters and consequently, crustacean assemblages show distinctly high density and diversity. The crustacean diversity slightly declines with increasing depth, whereas no relationship with the population density was detected. The results obtained highlight the recognition of crustacean communities as alternative proxy to investigate surface water-groundwater exchanges. We concluded that the hydrological connections between surface water and groundwater had a major influence in shaping the crustacean communities structure by controlling the diversity, density and ecological configuration of these populations. In the perspective of increasing alteration of surface-groundwater exchanges due to human actions, both small and large scale monitoring surveys are critical for placing groundwater changes in quality and quantity into a wider context, in order to enhance the assessment of subsurface ecosystems sensitivity to anthropogenic forcing and consequently reduce the negative impact.

  12. Observations of the vegetation of the Atigun River floodplain as affected by the crude oil spill from the Trans-Alaska Pipeline

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report is a summary of the results of botanical investigation conducted along the Atigun River, associated side channels and tributaries during the period 26 –...

  13. Hydrogeologic monitoring of the Paraíba do Sul river floodplain area subject to sand mining in the Tremembé municipality, SP, Brazil

    Directory of Open Access Journals (Sweden)

    Getulio Teixeira Batista

    2011-12-01

    Full Text Available To characterize the geological, hydrogeological, hydrochemical, and hydrobacterial aspects of the surface and groundwater in the floodplain of the Paraíba do Sul river in Tremembé municipality, the water levels of the Quaternary sedimentary aquifer experimental site was monitored based on four wells and eight associated piezometers with daily measures of water levels in continuous operation since December 3, 2009. In addition, data from a modular weather station in operation since March 2010 and data from the quality of surface water and groundwater have been analyzed in the period between March 2010 and March 2011. The water balance between April 2010 and March 2011 was estimated to verify the periods of water deficiency and excess. Data loggers installed in the piezometers enabled daily groundwater levels monitoring to establish the influence of the Paraíba do Sul river in the water levels of the Quaternary sedimentary aquifer and also they allowed the determination of the water loss to the atmosphere. A hydrogeological model with simplified equations, based on hydraulics parameters obtained in the wells pump tests, was implemented to calculate the amount of daily evapotranspiration and the average distance of the water loss from the wells to the atmosphere. An evaporation rate of 83.4 m3/h from the open-pit sand mine located at 212.2 m and of 89.2 m3/h for the one at 885.0 m average distance from the monitoring wells were observed. Chemical and bacteriological analysis involving multiple parameters were performed in the period from March 2010 to March 2011 in groundwater collected in wells, in the open-pit mines and in the waters of the Paraíba do Sul river. The results allowed to observe the influences of the Paraíba do Sul river as well as the contamination from fertilizers and pesticides from the agriculture practiced in the floodplain area on the quality of the groundwater.

  14. Malakofauna v nivě Jizery (Severní Čechy The mollusc fauna of the Jizera River floodplain (North Bohemia

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    Vojen Ložek

    2013-06-01

    Full Text Available This paper presents a research of floodplain mollusc communities of the Jizera River (the Elbe tributary, North Bohemia, Czech Republic. Altogether, 101 mollusc species (100 species of gastropods, one species of bivalve were recorded at 55 selected sites during previous and recent researches in 1945–1997 and 2002–2009, representing 40% of the total Czech malacofauna. The upper well-preserved stretch of the river hosts a rich forest mollusc fauna with some rare woodland species e.g. Arion intermedius, Cochlodina dubiosa corcontica, Daudebardia brevipes, D. rufa, Vertigo alpestris and Vitrea subrimata. Impoverish assemblages of the lower stretch are represented by some common or open/semi-open country species, because the river flows there through the landscape of an intensive agricultural land use and high settlement density. Despite, the occurrence of 31 rare species (four of them endangered, eight vulnerable, and 19 near threatened was recorded at the upper stretch of the Jizera River alluvium, which provides an important refuge for these mollusc faunas.

  15. Mapping of Cu and Pb Contaminations in Soil Using Combined Geochemistry, Topography, and Remote Sensing: A Case Study in the Le’an River Floodplain, China

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    Yin Gao

    2012-05-01

    Full Text Available Heavy metal pollution in soil is becoming a widely concerning environmental problem in China. The aim of this study is to integrate multiple sources of data, namely total Cu and Pb contents, digital elevation model (DEM data, remote sensing image and interpreted land-use data, for mapping the spatial distribution of total Cu and Pb contamination in top soil along the Le’an River and its branches. Combined with geographical analyses and watershed delineation, the source and transportation route of pollutants are identified. Regions at high risk of Cu or Pb pollution are suggested. Results reveal that topography is the major factor that controls the spatial distribution of Cu and Pb. Watershed delineation shows evidence that the streamflow resulting from rainfall is the major carrier of metal pollutants.

  16. Multiple Lines of Evidence Risk Assessment of Terrestrial Passerines Exposed to PCDFs and PCDDs in the Tittabawassee River Floodplain, Midland, Michigan, USA

    Science.gov (United States)

    Fredricks, Timothy B.; Giesy, John P.; Coefield, Sarah J.; Seston, Rita M.; Tazelaar, Dustin L.; Roark, Shaun A.; Kay, Denise P.; Newsted, John L.; Zwiernik, Matthew J.

    2011-01-01

    A site-specific multiple lines of evidence risk assessment was conducted for house wrens (Troglodytes aedon) and eastern bluebirds (Sialia sialis) along the Tittabawassee River downstream of Midland, Michigan, where concentrations of polychlorinated dibenzofurans (PCDFs) and polychlorinated dibenzo-p-dioxins (PCDDs) in flood-plain soils and sediments are greater compared to upstream areas and some of the greatest anywhere in the world. Lines of evidence supporting the population-level assessment endpoints included site-specific dietary- and tissue-based exposure assessments and population productivity measurements during breeding seasons 2005–2007. While a hazard assessment based on site-specific diets suggested that populations residing in the downstream floodplain had the potential to be affected, concentrations in eggs compared to appropriate toxicity reference values (TRVs) did not predict a potential for population-level effects. There were no significant effects on reproductive success of either species. The most probable cause of the apparent difference between the dietary- and tissue-based exposure assessments was that the dietary-based TRVs were overly conservative based on intraperitoneal injections in the ring-necked pheasant. Agreement between the risk assessment based on concentrations of PCDFs and PCDDs in eggs and reproductive performance in both species supports the conclusion of a small potential for population-level effects at this site. PMID:21804755

  17. The benefits of being big: effects of body size on energy budgets of three wintering goose species grazing Carex beds in the Yangtze River floodplain

    NARCIS (Netherlands)

    Wang, X.; Zhang, Y.; Zhao, M.; Cao, L.; Fox, A.

    2013-01-01