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Sample records for littoral caprellids crustacea

  1. The distribution of littoral caprellids (Crustacea: Amphipoda: Caprellidea along the Pacific coast of continental Chile La distribución de caprélidos litorales (Crustacea: Amphipoda: Caprellidea en la costa del Pacífico de Chile continental

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    MARTIN THIEL

    2003-06-01

    Full Text Available Many littoral caprellid species have a very ample distribution, some having been reported from all over the world. The cosmopolitan distribution of many littoral caprellid species might be facilitated by the fact that they are often associated with fouling communities on floating objects, which have a high potential of far-range dispersal. This dispersal potential may also have implications for the distribution of caprellids on local and regional scales. Herein we examined the distribution of littoral caprellid species on two spatial scales, local (tens of kilometers and regional (hundreds of kilometers along the Pacific coast of continental Chile. On the local scale, we studied the caprellid fauna in different habitats (intertidal boulders, subtidal algal and seagrass beds, fouling community on buoys and ropes; on the regional scale we focused only on caprellids associated with the fouling community on buoys and ropes. We found a total of six caprellid species, some of which were very abundant both on the local as well as on the regional scale. On the local scale we found a difference between the three studied habitat types with respect to the assemblage of caprellid species, some of which were found in more than one habitat. The highest species richness and abundance of caprellids was found in the fouling community associated with anchored buoys and ropes. On the regional scale we found very high numbers of caprellids in the fouling community of the northern region (n of 30°S, and decreasing abundances and species richness in the central region (30-37° S. No caprellids were found in the southern region of the study area (37-42° S. This pattern coincides with the global distribution of littoral caprellid species, which are most abundant and diverse at low latitudes but occur in low abundances and low diversity at high latitudes. Detached buoys that were found a few km off the coast harbored similar caprellid assemblages (including ovigerous

  2. Towards Integrated Multi-Trophic Aquaculture: Lessons from Caprellids (Crustacea: Amphipoda.

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    José Manuel Guerra-García

    Full Text Available The search for alternative live feed organisms and the progression of Integrative Multi-Trophic Aquaculture (IMTA are currently being highly prioritised in EU strategies. Caprellids could potentially be an important exploitable resource in aquaculture due to their high levels of beneficial polyunsaturated fatty acids, fast growing nature and widespread distribution. Furthermore, since they are mainly detritivorous, they could be excellent candidates for integration into IMTA systems, potentially benefitting from uneaten feed pellets and faeces released by cultured fish in fish farms and sea-cage structures. Despite this, there is a lack of experimental studies to: (i test inexpensive diets for caprellids, such as detritus, (ii develop sustainable caprellid culture techniques and (iii include caprellids in IMTA systems. The main aim of this study was to determine whether detritus (D in the form of fish faeces provided an adequate diet for caprellids in comparison to other traditional diets, such as Artemia nauplii (A or phytoplankton (P. Adult survival rate was shown to be significantly higher for caprellids fed with D. Conversely, hatchlings had the highest survival rate with A, although the juvenile growth rate and number of moults was similar in the three diets. With regard to lipid composition, caprellids fed with A had higher concentrations of Triacylglycerols (TAG and Phosphatidylcholine (PC while those fed with P or D were richer in polyunsaturated fatty acids, especially 22:6(n-3 (DHA. Interestingly, caprellids fed with D were also a rich source of 18:2(n-6 (LA, considered to be an essential fatty acid in vertebrates. It was found that detritus based mainly on fish faeces and uneaten feed pellets can be considered an adequate feed for adult caprellids, providing a source of both omega-3 (DHA and omega-6 (LA fatty acids. Hatchlings however seem to require an additional input of TAG and PC during juvenile stages to properly grow.

  3. On the occurrence of the tropical caprellid Paracaprella pusilla Mayer, 1890 (Crustacea: Amphipoda in Europe

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    M. ROS

    2012-12-01

    Full Text Available Paracaprella pusilla MAYER, 1980 is a tropical caprellid amphipod species first described from Brasil and very common along the Atlantic coast of Central America. Since its original description, P. pusilla has been found at numerous widespread locations in tropical and subtropical seas around the world, primarily associated with fouling communities in harbours. An established population of P. pusilla was recently found in Cádiz, southern Spain, which is both the northernmost collection and first record of this species in European coastal waters. Ship fouling is the most probable vector for its introduction. The species was always found associated with the native hydroid Eudendrium racemosum (CAVOLINI, 1785 and appeared to display a mutualistic relationship with this host.

  4. Exploring trophic strategies of exotic caprellids (Crustacea: Amphipoda): Comparison between habitat types and native vs introduced distribution ranges

    Science.gov (United States)

    Ros, Macarena; Tierno de Figueroa, José Manuel; Guerra-García, José Manuel; Navarro-Barranco, Carlos; Lacerda, Mariana Baptista; Vázquez-Luis, Maite; Masunari, Setuko

    2014-02-01

    The trophic ecology of non-native species is a key aspect to understand their invasion success and the community effects. Despite the important role of caprellid amphipods as trophic intermediates between primary producers and higher levels of marine food webs, there is very little information on their feeding habits. This is the first comprehensive study on the trophic strategies of two co-occurring introduced caprellids in the Spanish coasts: Caprella scaura and Paracaprella pusilla. The diet of 446 specimens of C. scaura and 230 of P. pusilla was analyzed to investigate whether there were differences in the feeding habits in relation to habitat characteristics (natural vs artificial hard substrata), type of host substrata (bryozoans and hydroids) and native vs introduced distribution ranges (Brazil vs Spain). Results revealed differences in diet preferences of the two species that have important implications for their trophic behaviour and showed a limited food overlap, which may favour their coexistence in introduced areas. In general terms, P. pusilla is a predator species, showing preference by crustacean prey in all of its life stages, while C. scaura feeds mainly on detritus. Although no sex-related diet shifts were observed in either of the species, evidence of ontogenetic variation in diet of C. scaura was found, with juveniles feeding on more amount of prey than adults. No diet differences were found between native and introduced populations within the same habitat type. However, P. pusilla exhibited a shift in its diet when different habitats were compared in the same distribution area, and C. scaura showed a flexible feeding behaviour between different host substrata in the same habitat type. This study shows that habitat characteristics at different scales can have greater influence on the feeding ecology of exotic species than different distribution ranges, and support the hypothesis that a switch between feeding strategies depending on habitat

  5. La fauna de caprélidos (Crustacea: Amphipoda: Caprellidea de la costa de Coquimbo, centro-norte de Chile, con una clave taxonómica para la identificación de las especies The caprellid fauna (Crustacea: Amphipoda: Caprellidea from the coast of Coquimbo, Northern-central Chile, with a taxonomic key for species identification

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    JOSÉ M. GUERRA-GARCÍA

    2001-12-01

    Full Text Available Los caprélidos son comunes y abundantes en muchos hábitats litorales del ambiente marino. Sin embargo este grupo de anfípodos no ha sido muy bien estudiado en la costa chilena. El estudio de los caprélidos se ha visto dificultado por su gran variabilidad morfológica y el hecho de que la literatura así como los especímenes de los museos son difíciles de localizar. El objetivo de este estudio fue entregar las herramientas taxonómicas para la identificación de las especies de crustáceos caprélidos comunes en el centro-norte de la costa de Chile. Se muestrearon distintos hábitats (boyas, bolones intermareales, praderas de algas y fanerógamas marinas y se encontraron seis especies distintas de caprélidos: Caprellina longicollis (Nicolet, 1849, Caprella equilibra Say, 1818, C. scaura Templeton, 1836, C. verrucosa Boeck, 1871; Deutella venenosa Mayer, 1890 y Paracaprella pusilla Mayer, 1890. Caprella scaura, C. verrucosa y D. venenosa fueron muy abundantes sobre las algas, hidrozoos y briozoos asociados a boyas. Caprella equilibra, también presente en boyas, fue más abundante bajo piedras en zonas intermareales rocosas expuestas, donde también se encontraron ejemplares de D. venenosa y de P. pusilla. Caprella scaura también se encontró sobre algas rojas de las playas arenosas, especialmente sobre Gracilaria chilensis y sobre la fanerógama marina Heterozostera tasmanica, donde cohabitó junto a Caprellina longicollis. Paracaprella pusilla constituye una nueva cita para las costas pacíficas sudamericanas, siendo nueva para la fauna de Chile. La especie D. venenosa, que se cita por primera vez después de la descripción original de Mayer en el año 1890, es considerada una especie endémica de la costa central de ChileCaprellids are abundant in many littoral habitats of the marine environment. Nevertheless, this group of amphipods has been scarcely studied along the coast of Chile. The study of the Caprellidea is particularly

  6. New littoral, shelf, and bathyal Paratanaidae (Crustacea: Peracarida: Tanaidacea) from New Zealand, with descriptions of three new genera.

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    Bird, Graham J; Bamber, Roger N

    2013-01-01

    Three new genera, Acallocheirus, Aparatanais, and Penteparatanais, and seven new species of the paratanaid subfamily Paratanaidinae are described from New Zealand. New records of three previously known species Atemtanais taikaha, Paratanais paraoa, and P. tara, are also given. Paratanais denticulatus, P. intermedius, P. malignus, P. spinanotandus,and P. vicentetis are transferred to Aparatanais. A key is given to all paratanaidin genera and the NZ Paratanais species. In NZ waters, paratanaids are now known from the littoral zone to 908 m in the bathyal regions of the Chatham Rise and Hikurangi Margin, several of the offshore species being recorded in bryozoan mats. All but one appear to be endemic but may have sibling species elsewhere, particularly in the Southern Hemisphere. Supplementary notes are given on two Australian species P. maleficus and P. perturbatius that clarify their description and diagnostic characters.

  7. Tanaidáceos (Crustacea: Peracarida de los litorales de Guerrero y Oaxaca, México Littoral tanaidaceans (Crustacea: Peracarida from Guerrero and Oaxaca, Mexico

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    Jani Jarquín-González

    2010-10-01

    Full Text Available Los tanaidáceos son componentes esenciales de las cadenas tróficas del bentos marino, son fuente de alimento para especies de relevancia comercial y para otros organismos marinos. A pesar de su importancia, el conocimiento del grupo se ha rezagado debido a los problemas relacionados con su biología y taxonomía, y por la carencia de muestreos exhaustivos y sistemáticos; así, en las costas de Guerrero y Oaxaca sólo se había registrado 1 género. Por lo anterior, el objetivo fue conocer la composición específica y los patrones de distribución de los tanaidáceos litorales de Guerrero y Oaxaca. De 4 275 ejemplares, se identificaron 6 familias y 9 morfotipos: Hexapleomera robusta, Sinelobus stanfordi, Leptochelia cf. dubia, Paratanais cf. denticulatus, Paradoxapseudes cf. garthi, Apseudormorpha sp., Cyclopoapseudes cf. indecorus, Synapseudes sp. y Parapseudes pedispinis. Todos son registros nuevos para el litoral de Guerrero y Oaxaca. Se amplía el intervalo de distribución hacia el norte, para H. robusta de islas Galápagos a Guerrero. Para S. stanfordi y P. pedispinis se proporcionan localidades intermedias que rompen con la distribución disyunta previa en el Pacífico oriental. Hay 6 especies, posiblemente nuevas, con distribución restringida; 2 son de amplia distribución y 1 restringida al Pacífico oriental tropical.The tanaidaceans are essential components in food chains of marine benthos, since they are the main food source for commercially important species and other marine organisms. Despite their importance, problems related to their biology and taxonomy have delayed the understanding of the group, as observed on the coasts of Guerrero and Oaxaca, where only 1 genus was previously known. The aim was to determine the species richness and distribution patterns of littoral tanaids from Guerrero and Oaxaca. A total of 4 275 specimens were collected and 6 families and 9 morphotypes have been identified: Hexapleomera robusta

  8. Characterization and sequence analysis of manganese superoxide dismutases from Brachyura (Crustacea: Decapoda): hydrothermal Bythograeidae versus littoral crabs.

    Science.gov (United States)

    Marchand, J; Leignel, V; Moreau, B; Chénais, B

    2009-06-01

    Hydrothermal vent conditions are particular and organisms living in these environments may have developed detoxification mechanisms and/or genetic adaptations. In particular, physico-chemical conditions are thought to generate reactive oxygen species, highly toxic for organisms. The enzyme superoxide dismutase constitutes the first line of defense against oxidative damage. To improve our understanding of the environmental impacts exerted on the vent organisms, we have characterized the two manganese superoxide dismutase cDNAs (mitochondrial: mMnSOD and cytoplasmic: cMnSOD) of three members of the Bythograeidae (Bythograea thermydron, Cyanagraea praedator and Segonzacia mesatlantica), the only endemic crab family living in hydrothermal vents. In comparison, the isolation of manganese superoxide dismutase cDNAs was also carried out in several littoral crab families. MnSOD signatures were found in both sequences from each species studied, as well as different residues involved in metal coordination and protein activity. The phylogenetic analysis performed confirms the probable ancient duplication that gave rise to the two MnSODs (cMnSOD and mMnSOD). This study describes two potential distinct mMnSOD isoforms presenting particular peptide signals. Nevertheless, no sequence particularity that could support the hypothesis of a genetic adaptation was found in Bythograeidae's MnSODs compared to the other sequences. The mRNA expression analysis performed by real-time PCR on B. thermydron and S. mesatlantica compared to Cancer pagurus and Necora puber revealed a higher cMnSOD and mMnSOD mRNA expression in hydrothermal crabs compared to littoral crabs.

  9. Littoral Cells 2005

    Data.gov (United States)

    California Department of Resources — Littoral cells along the California Coast. Originally digitized by Melanie Coyne from the Assessment and Atlas of Shoreline Erosion Along the California Coast...

  10. Littoral Cells 2005

    Data.gov (United States)

    California Department of Resources — Littoral cells along the California Coast. Originally digitized by Melanie Coyne from the Assessment and Atlas of Shoreline Erosion Along the California Coast...

  11. Seasonal fluctuations of some biological traits of the invader Caprella scaura (Crustacea: Amphipoda: Caprellidae in the Mar Piccolo of Taranto (Ionian Sea, southern Italy

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    Ermelinda Prato

    2013-03-01

    Full Text Available Caprella scaura is an epifaunal amphipod crustacean that originates in the western Indian Ocean and has spread throughout the world, but very little is known about fundamental aspects of its biology. This paper is the first presentation of its life history traits in an invaded region. The study was conducted in the Mar Piccolo basin (southern Italy, Ionian Sea, over a one-year period. All biological parameters showed a strong seasonal pattern, breeding peaked twice during the year and the number of eggs in the ventral brood pouch ranged from 5 to 72. The sex ratio was generally close to 1:1. A strong correlation between total length of ovigerous females and number of eggs was observed. The mean length of both mature males and mature females was 10.63 and 7.70 mm, respectively. The results of this study showed that the population dynamics of this species was not dissimilar to that of other caprellids or marine epifaunal Crustacea. This caprellid has given rise to a stable population in the Mar Piccolo; it was present all year round in the study area but its density suggests that it is not yet a strong invader.

  12. Littoral Combat Ship Crew Scheduling

    Science.gov (United States)

    2015-03-01

    package DON Department of the Navy F&R Fix and Relax GAMS General Algebraic Modeling System LCS Littoral Combat Ship LCSRON Littoral Combat Ship...but that can be acceptable depending on the scheduler needs. F&R produces superior long-term schedules when compared to a similar-length RH schedule...LEFT BLANK 29 IV. MODEL IMPLEMENTATION LCSS is implemented with the General Algebraic Modeling System (GAMS) using the GAMS/CPLEX (GAMS, 2014

  13. Enkele interessante Nederlandse crustacea

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    Holthuis, L.B.

    1969-01-01

    In de laatste jaren heeft het Rijksmuseum van Natuurlijke Historie enkele vermeldenswaardige Crustacea ontvangen, die uit de Nederlandse wateren en uit de zuidelijke Noordzee afkomstig zijn. Twee van deze bleken tot soorten te behoren die nog niet eerder uit ons land vermeld waren, te weten de

  14. The spreading of the non-native caprellid (Crustacea: Amphipoda Caprella scaura Templeton, 1836 into southern Europe and northern Africa: a complicated taxonomic history.

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    M. ROS CLEMENTE

    2013-12-01

    Full Text Available Caprella scaura, originally described by Templeton (1836 from Mauritius and later reported as several subspecies from numerous areas of the world, was found for the first time in the Mediterranean in 1994. Since this report, the species was found in several Mediterranean locations. To explore the current distribution of C. scaura in the Iberian Peninsula and adjacent areas, we surveyed marine fouling communities from 88 marinas along the whole Iberian Peninsula and North Africa, 3 from Italy, 1 from France, 1 from Malta and 1 from Greece between June 2011 and June 2012. The results of this survey report the first confirmed record of C. scaura in Corsica (France, Creta (Greece and Morocco, and confirm an extensive distribution of C. scaura along the Spanish Mediterranean coast and the Strait of Gibraltar. The species was absent in the north Atlantic coast of Spain and the upper distribution limit in the eastern Atlantic coast is the locality of Cascais, in the south coast of Portugal. All populations studied belong to the same morphological form, with match with the subspecies C. scaura typica from Brazil and C. scaura scaura from Mauritius, suggesting that these two subspecies could correspond to the same “variety”.

  15. Influence of littoral periphyton on whole-lake metabolism relates to littoral vegetation in humic lakes.

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    Vesterinen, Jussi; Devlin, Shawn P; Syväranta, Jari; Jones, Roger I

    2017-09-09

    The role of littoral habitats in lake metabolism has been underrated, especially in humic lakes, based on an assumption of low benthic primary production (PP) due to low light penetration into water. This assumption has been challenged by recent recognition of littoral epiphyton dominance of whole-lake PP in a small highly humic lake and of epiphyton as an important basal food source for humic lake biota. However, as these studies have mostly concerned single lakes, there is a need to test their wider generality. We studied the whole-lake PP and community respiration (CR) in eight small humic lakes in southern Finland during July 2015 using (14) C incorporation to measure pelagic PP and the changes in dissolved inorganic carbon in light and dark in situ incubations to measure CR and littoral PP by epiphyton. Changes in O2 concentration in both pelagic and littoral surface water were measured periodically from each lake and, additionally, continuously with a data logger from one lake during the study period. The results revealed that the littoral dominated whole-lake net primary production (NPP) in five of the eight lakes, which was supported by observed O2 supersaturation in the littoral surface water in most of the lakes. Calculated pelagic:littoral ratios by area correlated negatively with both littoral NPP and littoral contribution to whole-lake NPP. Moreover, there was a significant positive relationship between littoral proportion of whole-lake NPP and the fraction of lake surface area covered by littoral aquatic vegetation. This demonstrates that increased aquatic littoral vegetation cover increases the overall importance of the littoral to whole-lake PP in highly humic lakes. Littoral NPP also correlated strongly with littoral O2 saturation, and the continuously measured O2 revealed substantial temporal variation in O2 saturation, particularly in the littoral zone. Whole-lake gross primary production:community respiration (GPP:CR) ratios revealed that

  16. Les paradoxes du littoral Swahili

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    François Bart

    2008-10-01

    Full Text Available Le contact entre l'océan Indien occidental et le continent africain a forgé l'identité et l'originalité du littoral swahili. Cette interface, longue d'environ 2 000 kilomètres, du sud de la Somalie au nord du Mozambique, constitue un monde original où, au gré de traditions anciennes de circulation maritime et continentale se sont diffusées et mêlées des influences culturelles venues du continent africain, de la péninsule arabique et de la péninsule indienne. Le développement du continent, du littoral et des archipels s'inscrit dans une double logique de fragmentation et d'ouverture au monde. Dans cette vaste aire géographique, le rôle de relais des îles et des axes de pénétration continentale à partir des ports est essentiel.The identity and the original features of the Swahili seashore mainly proceed from the contact of African mainland and western indian Ocean. This coastal interface, stretching over 2 000 kilometres from southern Somalia to northern Mozambique, is characterized by ancient traditions of trade movements through maritime areas and mainland as well, which spread and mixed different cultural influences originating from Africa and both Arabic and Indian peninsulas. The development of this area is linked to both fragmentation and opening dynamics. In such a wide area, the relaying function of islands and continental corridors from main harbours is very important.

  17. Littoral steering of deltaic channels

    Science.gov (United States)

    Nienhuis, Jaap H.; Ashton, Andrew D.; Giosan, Liviu

    2016-11-01

    The typically single-threaded channels on wave-influenced deltas show striking differences in their orientations, with some channels oriented into the incoming waves (e.g., Ombrone, Krishna), and others oriented away from the waves (e.g., Godavari, Sao Francisco). Understanding the controls on channel orientation is important as the channel location greatly influences deltaic morphology and sedimentology, both subaerially and subaqueously. Here, we explore channel orientation and consequent feedbacks with local shoreline dynamics using a plan-form numerical model of delta evolution. The model treats fluvial sediment delivery to a wave-dominated coast in two ways: 1) channels are assumed to prograde in a direction perpendicular to the local shoreline orientation and 2) a controlled fraction of littoral sediment transport can bypass the river mouth. Model results suggest that channels migrate downdrift when there is a significant net littoral transport and alongshore transport bypassing of the river mouth is limited. In contrast, river channels tend to orient themselves into the waves when fluvial sediment flux is relatively large, causing the shoreline of the downdrift delta flank to attain the orientation of maximum potential sediment transport for the incoming wave climate. Using model results, we develop a framework to estimate channel orientations for wave-influenced deltas that shows good agreement with natural examples. An increase in fluvial sediment input can cause a channel to reorient itself into incoming waves, behavior observed, for example, in the Ombrone delta in Italy. Our results can inform paleoclimate studies by linking channel orientation to fluvial sediment flux and wave energy. In particular, our approach provides a means to quantify past wave directions, which are notoriously difficult to constrain.

  18. The Crustacea Decapoda of Cyprus

    NARCIS (Netherlands)

    Lewinsohn, Ch.; Holthuis, L.B.

    1986-01-01

    An account of the species of Crustacea Decapoda so far known from Cyprus, based on (1) material collected during the 1967-1970 Hebrew University - Smithsonian Institution Joint Program "Biota of the Red Sea and the Eastern Mediterranean", (2) Cyprus material from other sources, and (3) published rec

  19. Littoral Subsonic Seismoacoustic Phenomena Ultrasonic Modeling

    Science.gov (United States)

    2016-06-07

    Littoral Subsonic Seismoacoustic Phenomena Ultrasonic Modeling Jacques R. Chamuel Sonoquest Advanced Ultrasonics Research P.O. Box 81153 Wellesley... variable water/air content, and benthic shelled animals leading to accurate acoustic modeling of littoral surficial layer and geophysical inversion...UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) Sonoquest Advanced Ultrasonics Research ,P.O. Box 81153,Wellesley Hills,MA,02481-0001 8

  20. Maritime SOF in the littorals: theoretical principles for successful littoral special operations

    OpenAIRE

    Grimeland, Torbjorn; van der Veen, Oscar

    2016-01-01

    Approved for public release; distribution is unlimited This thesis uses past experiences to help develop a theoretical framework for maritime special operations forces (SOF) to succeed in the littorals. The theoretical framework defines six principles important to special operations in littoral spaces: deliberate planning, tailored force, specified mobility, joint support, cover/concealment, and innovation. Five historical case studies followed by a vignette show the importance of these th...

  1. Logistical Analysis of the Littoral Combat Ship

    Science.gov (United States)

    2003-03-01

    and CAPT Jeff Kline for sparking my interest in the Littoral Combat Ship and CAPT James Stewart at Commander, Naval Surface Forces Pacific and CDR...Senior Lecturer of Operations Research Naval Postgraduate School Monterey, California 76 10. James Stewart , CAPT, USN Warfare Requirements, N8

  2. A model for lightning in littoral areas

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    Blaj, M.A.; Leferink, Frank Bernardus Johannes

    2009-01-01

    The littoral or coastal areas are different compared to the maritime or continental areas considering lightning. Only the last years some research about these areas has been carried out. The need for a model, regarding the lightning activity in these areas is much needed. And now, with the changes i

  3. Landscape eco-environmental research on littoral zone in China.

    Science.gov (United States)

    Peng, Jian; Wang, Yang-lin; Jing, Juan; Li, Wei-feng; Ding, Yan

    2004-01-01

    Littoral zone is a special land/landscape type. As an important kind of land resource in support, the use of littoral zone is vital to eastern coastal areas in China. And the research on littoral zone relates to the key theory of landscape ecology. Based on the theory of landscape ecology, the littoral zone was divided into four types: mud flat, sand beach, bench, and biological flat. The distribution of each type in China is pointed out. As a typical open system, littoral zone has six landscape ecological characteristics: (1) high sensitivity to disturbance; (2) distinct edge effect; (3) spatial aggregation of natural resources; (4) frequently spatial oscillation; (5) obviously spatial heterogeneity; and (6) noticeably spatial differentiation. Some proposals are also put forward on the land use and development of littoral zone for environmental protection and environmental management.

  4. Littoral Combat Ship Open Ocean Anti-Submarine Warfare

    Science.gov (United States)

    2014-06-01

    COVERED Capstone 4. TITLE AND SUBTITLE LITTORAL COMBAT SHIP OPEN OCEAN ANTI-SUBMARINE WARFARE 5. FUNDING NUMBERS 6. AUTHOR(S) 311-124O/Team LCS...Life cycle cost LCCE Life cycle cost estimate LCS Littoral combat ship LHA Landing ship, helicopter assault LHD Landing ship, helicopter...is unlimited LITTORAL COMBAT SHIP OPEN OCEAN ANTI- SUBMARINE WARFARE by Team LCS 311-124O June 2014 Capstone Advisors: John Green Dan

  5. CHARACTERISTICS OFBENTHIC FISH COMMUNITY OF DNIEPER STORAGE POOL LITTORAL ZONE

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    Novitskiy R. A.

    2011-11-01

    Full Text Available Specific composition of bull-calves is analyzed together with their quantitative and quality parameters in the littoral zone of the Dnepr storage pool. The structural-functional features of organization of littoral communities of bull-calves were studied. The patterns of spatial distribution of Bull-calf (Gobiidae representatives were analyzed for the storage pool; their role in the littoral fish communities was clarified.

  6. Littoral transport rates in the Santa Barbara Littoral Cell: a process-based model analysis

    Science.gov (United States)

    Elias, E. P. L.; Barnard, Patrick L.; Brocatus, John

    2009-01-01

    Identification of the sediment transport patterns and pathways is essential for sustainable coastal zone management of the heavily modified coastline of Santa Barbara and Ventura County (California, USA). A process-based model application, based on Delft3D Online Morphology, is used to investigate the littoral transport potential along the Santa Barbara Littoral Cell (between Point Conception and Mugu Canyon). An advanced optimalization procedure is applied to enable annual sediment transport computations by reducing the ocean wave climate in 10 wave height - direction classes. Modeled littoral transport rates compare well with observed dredging volumes, and erosion or sedimentation hotspots coincide with the modeled divergence and convergence of the transport gradients. Sediment transport rates are strongly dependent on the alongshore variation in wave height due to wave sheltering, diffraction and focusing by the Northern Channel Islands, and the local orientation of the geologically-controlled coastline. Local transport gradients exceed the net eastward littoral transport, and are considered a primary driver for hot-spot erosion.

  7. Simulated drawdown and rewetting of littoral sediments

    DEFF Research Database (Denmark)

    Klamt, Anna-Marie; Reitzel, Kasper; Andersen, Frede Østergaard

    2016-01-01

    This study aims to answer the question if temporary drawdowns could be a beneficial restoration measure for endangered Lobelia lakes. Intact littoral sediment cores with and without plants were used to simulate a drawdown over an almost 5 months period and a subsequent rewetting. During drawdown...... for endangered Lobelia lakes given that the isoetid plants spread during the drying period......., the initial low saturation of sorption sites for phosphorus (P) increased due to increased contents of mobile P forms in the surface layers. Contents of P binding iron forms remained constant. The increase of mobile P forms was mostly derived from decayed plant material since the experimental set up caused...

  8. Deforestation and plant diversity of Madagascar's littoral forests.

    Science.gov (United States)

    Consiglio, Trisha; Schatz, George E; McPherson, Gordon; Lowry, Porter P; Rabenantoandro, Johny; Rogers, Zachary S; Rabevohitra, Raymond; Rabehevitra, David

    2006-12-01

    Few studies have attempted to quantify the reduction or document the floristic composition of forests in Madagascar. Thus, we focused specifically on deforestation and plant diversity in Madagascar's eastern littoral community. We used a data set of approximately 13,500 specimen records compiled from both historical and contemporary collections resulting from recent intensive inventory efforts to enumerate total plant species richness and to analyze the degree of endemism within littoral forests. Change in littoral forest cover from original to current extent was estimated using geographical information systems tools, remote sensing data (satellite imagery and low-elevation digital photography), and environmental data layers. Of the original littoral forest only 10.3% remains in the form of small forest parcels, and only 1.5% of these remaining fragments are included within the existing protected-areas network. Additionally, approximately 13% of Madagascar's total native flora has been recorded from these forests that originally occupied land surface, and over 25% of the 1535 plant species known from littoral forests are endemic to this community. Given the ongoing pressure from human settlement along Madagascar's eastern coast, protection of the remaining forest fragments is critical for their survival. Fifteen of the largest intact littoral forest fragments we identified, collectively representing 41.5% of remaining littoral forest, are among priority sites recommended to the government of Madagascar for plant conservation and incorporation into the protected-areas network.

  9. Common littoral pycnogonids of the Mediterranean Sea

    Directory of Open Access Journals (Sweden)

    Tobias Lehmann

    2014-10-01

    Full Text Available In the present study 21 littoral pycnogonid species from 5 families are analysed: Ammotheidae (9 species, Callipallenidae (5 species, Endeidae (2 species, Phoxichilidiidae (3 species, and Pycnogonidae (2 species. The material was mainly taken from Mediterranean pycnogonid collections housed in the Bavarian State Collection of Zoology. Additional material was collected during field trips. Altogether the material was obtained from six different locations: Banyuls-sur-Mer (France, Tavolara Island (Italy, Elba Island (Italy, Giglio Island (Italy, Sicily Island (Italy, and Istria Peninsula (Croatia. The animals were studied in detail with a scanning electron microscope (SEM. Additionally series of light microscopic pictures were made to generate extended depth of field pictures of whole animals. The observed features are compared with previous literature.

  10. Littoral transport studies along west coast of India - A reivew

    Digital Repository Service at National Institute of Oceanography (India)

    Kunte, P.D.; Wagle, B.G.; Sugimori, Y.

    This article presents an overview of investigations that were carried out to determine the dynamics of littoral transport along the west coast of India, during last three decades. Sedimentological methods, wave refraction diagrams, tracer tracking...

  11. Wave refraction and littoral currents off Colva Beach, Goa

    Digital Repository Service at National Institute of Oceanography (India)

    Veerayya, M.; Murty, C.S.; Varadachari, V.V.R.

    Wave refraction studies have been carried out for waves of different periods approaching the coast at Colva, with directions of approach lying between180 degrees and 340 degrees, to obtain a qualitative picture of littoral flows along the beach...

  12. Littoral Zone Sediments, San Diego, Region, October 1983-June 1984.

    Science.gov (United States)

    1985-12-01

    corresponding foreshore samples within the five littoral segments at Lake Tahoe which show the most persistent grain-size fining trends. The value for the...terrains exposed at higher elevations as the dominant ultimate source rocks for the obtained sample set. 3.03 The Geologic Map of the Corona, Elsinore ...Austin, Texas, Hemphill’s Bookstore, 182 p. Gaynor, J. M., 1984, Sources and transport of sand in the littoral zone of Lake Tahoe, California and Nevada

  13. Maritime Sof in the Littorals: Theoretical Principles for Successful Littoral Special Operations

    Science.gov (United States)

    2016-06-01

    narrow band , referred to as the littoral and is defined as those land areas (and their adjacent sea and associated air space) that are predominantly...Strategic Studies, 1993), 101–2. http://www.dtic.mil/dtic/tr/fulltext/ u2 /a528871.pdf. 152 Hooker and Coglianese, Operation Weserübung and the Origins of...Defense University, Institute for National Strategic Studies, 1993. http://www.dtic.mil/dtic/tr/fulltext/ u2 /a528871.pdf. Hovtun, Lars M. “Spesialister

  14. Lake shoreline and littoral physical habitat structure in a national lakes assessment

    Science.gov (United States)

    Riparian and littoral habitat components are important to lake biological assemblages, providing refuge from predation, living and egg-laying substrates, and food. Shoreline structure also affects nutrient cycling, littoral production, and sedimentation rates. Measures of ripar...

  15. Naamlijst van de Nederlandse landpissebedden (Crustacea: Isopoda: Oniscidea)

    NARCIS (Netherlands)

    Berg, M.P.

    1997-01-01

    Checklist of Dutch woodlice (Crustacea: Isopoda: Oniscidea). An updated checklist for the terrestrial isopods of The Netherlands is presented. Four species, Armadillo officinalis, Eluma purpurascens, Miktoniscus patiencei, and Trichoniscoides sarsi are new to the woodlice fauna of The Netherlands co

  16. EO system concepts in the littoral

    Science.gov (United States)

    Schwering, Piet B. W.; van den Broek, Sebastiaan P.; van Iersel, Miranda

    2007-04-01

    In recent years, operations executed by naval forces have taken place at many different locations. At present, operations against international terrorism and asymmetric warfare in coastal environments are of major concern. In these scenarios, the threat caused by pirates on-board of small surface targets, such as jetskis and fast inshore attack crafts, is increasing. In the littoral environment, the understanding of its complexity and the efficient use of the limited reaction time, are essential for successful operations. Present-day electro-optical sensor suites, also incorporating Infrared Search and Track systems, can be used for varying tasks as detection, classification and identification. By means of passive electro-optical systems, infrared and visible light sensors, improved situational awareness can be achieved. For long range capability, elevated sensor masts and flying platforms are ideally suited for the surveillance task and improve situational awareness. A primary issue is how to incorporate new electro-optical technology and signal processing into the new sensor concepts, to improve system performance. It is essential to derive accurate information from the high spatial-resolution imagery created by the EO sensors. As electro-optical sensors do not have all-weather capability, the performance degradation in adverse scenarios must be understood, in order to support the operational use of adaptive sensor management techniques. In this paper we discuss the approach taken at TNO in the design and assessment of system concepts for future IRST development. An overview of our maritime programme in future IRST and EO system concepts including signal processing is presented.

  17. Littoral drift computations on mutual wave and current influence

    NARCIS (Netherlands)

    Bijker, E.W.

    1971-01-01

    11th Conference on Coastal Engineering in London 1968, the author presented a method for computing the littoral drift starting from the longshore current velocity as this is generated by the waves and with the assumption that the material is stirred up by the waves. In this paper measurements in a m

  18. Littoral Cell Angioma in a Patient with Crohn's Disease

    Science.gov (United States)

    Björnsson, Bergthor; Ignatova, Simone; Sandström, Per; Ekstedt, Mattias

    2015-01-01

    Littoral cell angioma is a rare vascular tumor of the spleen. The pathogenesis is unknown but the lesion is associated with several malignancies and immunological disorders. The diagnosis requires histopathological examination. The malignant potential of this lesion is unknown, which is why splenectomy is recommend for all cases. Symptomatic cases generally suffer from hypersplenism and pyrexia. A previously healthy 20-year-old female was diagnosed with colonic Crohn's disease; as part of the work-up a magnetic resonance enterography was performed which showed multiple signal changes of the spleen. The patient reported chronic abdominal pain in the left upper quadrant, malaise, and fever. The unknown splenic lesions prompted a laparoscopic splenectomy; pathology revealed a littoral cell angioma. The abdominal pain and malaise remitted but the fever persisted one year despite adequate treatment of the patient's Crohn's disease. Littoral cell angioma is associated with immune-dysregulation including Crohn's disease with several reported cases. Signs and symptoms of hypersplenism and splenic lesions on imaging should raise suspicion of littoral cell angioma in patients with Crohn's disease. Magnetic resonance enterography to assess disease severity in Crohn's disease may provide an opportunity to study the prevalence and natural history of this rare splenic tumor. PMID:25705528

  19. Littoral Encounters : The Shore as Cultural Interface in King Horn

    NARCIS (Netherlands)

    Sobecki, Sebastian

    2006-01-01

    1. III * Later Medieval: Excluding Chaucer -- Brown et al., 10.1093 ... ... between the Saracens and the londisse men allied to the protagonist (' Littoral Encounters: the Shore as Cultural Interface in King Horn', Al-Mas a ... www.ywes.oxfordjournals.org/cgi/content/full/man0092 2.Murray, Alan V. “

  20. Topoclimatic map of the littoral zone in Slovenian Istria

    Directory of Open Access Journals (Sweden)

    Darko Ogrin

    2011-12-01

    Full Text Available The paper presents the basic topoclimatic features of the littoral zone in Slovenian Istria which result from general climate features and specific local conditions. The most widely spatially spread topoclimatic units arise from differences in insolation and the combination of local landforms and land use. They are presented on the map at a scale of 1 : 50,000.

  1. Selenium deficiency in subtropical littoral pampas: environmental and dietary aspects.

    Science.gov (United States)

    Mirlean, N; Seus-Arrache, E R; Vlasova, O

    2017-04-11

    Se deficiency has a critical effect on human health. The littoral near Patos Lagoon in the south of Brazil is composed of Quaternary sandy deposits and nutrient-deficient soils, which contribute to Se deficiency in the surrounding environment. The average concentration of Se in littoral soils is six times lower than the metalloid deficiency threshold of 0.5 mg kg(-1) and is close to that in countries where Keshan disease is registered. The sediments in the Patos Estuary are also notably lower in Se than near-shore marine sediments. Foodstuffs produced in the littoral pampas are characterised by extremely low Se concentrations compared with the same alimentary products reported worldwide. The total daily dietary intake of Se in the region is 24 μg day(-1), which is half the Estimated Average Requirement for adults. Black beans in the local diet provide over 40% of daily Se intake. Prescriptive addition of Se to prevalent products seems the most effective solution to the problem of metalloid dietary deficiency in the region. Similar environmental conditions and significant concentration of the population in the littoral zone suggest that the problem of Se deficiency probably affects a large proportion of the population along the Atlantic coast of Brazil.

  2. Identification of Littoral Targets with a Laser Range Profiler

    NARCIS (Netherlands)

    Heuvel, J.C. van den; Bekman, H.H.P.T.; Putten, F.J.M. van; Cohen, L.H.

    2007-01-01

    Naval operations in the littoral have to deal with threats at short range in cluttered environments with both neutral and hostile targets. On board naval vessels there is a need for fast identification, which is possible with a laser range profiler. Additionally, in a coast-surveillance scenario a

  3. First record of the littoral family Isotogastruridae (Collembola in Asia

    Directory of Open Access Journals (Sweden)

    Yan Gao

    2011-10-01

    Full Text Available The new species Isotogastrura trichaetosa sp. n. is described from a sand beach of Hainan, South China. It differs from all its congeners by 3+3 axial setae on Abd. IV (vs. 2+2 and by the presence of a pair of tubercles on Abd.VI. The geography of this strictly littoral genus is discussed.

  4. Reproductive biology and seasonality of the Indo-Australasian mysid Mesopodopsis orientalis (Crustacea: Mysida) in a tropical mangrove estuary, Malaysia

    Science.gov (United States)

    Hanamura, Yukio; Siow, Ryon; Chee, Phaik-Ean

    2008-04-01

    A year-round survey of the tropical shallow-water mysid Mesopodopsis orientalis (Tattersall, 1908) (Crustacea, Mysidacea) was conducted in the Merbok mangrove estuary, northwestern Peninsular Malaysia. The mysid formed dense aggregations at the river's edge close to the mangrove forest during the daytime, but very few were captured elsewhere in the estuary system. The sampled population was found in a wide range of salinities from 16 to 32, demonstrating broad euryhalinity, and the number of the catch at the littoral zone ranged from 11.8 to 2273 ind m -2. The overall annual mean was 709.2 ind m -2. Females predominated over males in the entire population, and brooding females were present at every monthly sample, indicating that reproduction is continuous year round. The clutch size positively correlated with female body length. The diameter of eggs (Stage I embryos) was unaffected by the seasonality and independent of the maternal size within an observed size range. The life history pattern of the estuarine population of M. orientalis showed close similarity to that of the coastal counterpart. However, the former was found to produce fewer but larger eggs, and the specimens in this population were larger than those in the coastal population at the embryo, juvenile, and adult stages. This evidence indicates that the life history features of the estuarine population would differ to some degree from those of the coastal counterpart.

  5. Littoral-cell angioma of the spleen: A case report

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Littoral-cell angioma (LCA) is a primary splenic vascular tumor that arises from the normal littoral cells lining the sinus channels of the splenic red pulp. We report a case of LCA of the spleen, which has been infrequently communicated in the literature. A 76-year-old man with a 2-wk history of weight loss, abdominal pain and changes in bowel habits was admitted to our hospital.Imaging studies (CT and MRI) showed multiple lesions in the spleen. Splenectomy was performed. Lining cells were positive for CD31/CD68 markers. Our case was associated with a serrated colonic adenoma. LCA is a benign vascular tumor of the spleen that needs to be included in the differential diagnosis of multiple splenic nodules.

  6. Landscape eco-environmental research on littoral zone in China1

    Institute of Scientific and Technical Information of China (English)

    PENG Jian; WANG Yang-lin; JING Juan; LI Wei-feng; DING Yan

    2004-01-01

    Littoral zone is a special land/ landscape type. As an important kind of land resource in support, the use of littoral zone is vital to eastern coastal areas in China. And the research on littoral zone relates to the key theory of landscape ecology. Based on the theory of landscape ecology, the littoral zone was divided into four types: mud flat, sand beach, bench, and biological flat. The distribution of each type in China is pointed out. As a typical open system, littoral zone has six landscape ecological characteristics: (1) high sensitivity to disturbance; (2) distinct edge effect; (3) spatial aggregation of natural resources; (4) frequently spatial oscillation; (5) obviously spatial heterogeneity; and (6) noticeably spatial differentiation. Some proposals are also put forward on the land use and development of littoral zone for environmental protection and environmental management.

  7. Fighting The Network: Manet Management In Support Of Littoral Operations

    Science.gov (United States)

    2016-03-01

    a constrained temporal and spatial environment. Ongoing research into the integration of unmanned systems and sensors as mobile ad-hoc network... temporal and spatial environment. Ongoing research into the integration of unmanned systems and sensors as mobile ad-hoc network (MANET) nodes...Sharing ISO International Standards Organization JFC Joint Force Commander JOA Joint Operations Area KML Keyhole Markup Language LCS Littoral Combat

  8. Lions in the Littoral - Leadership on Risk’s Edge

    Science.gov (United States)

    2015-01-01

    War, the Swedish Navy learned that many afloat sensors and weapon systems were solely desig- ned for blue water operations and not for the littoral...weapon systems . Existing systems had not been designed to handle the clutter, shallow waters and ducting phenomena that are peculiar to that...experimentation and training by bringing it from the Baltic to San Diego from 2005 to 2007. The common leadership threads abo - ve are youth combined with

  9. Air transportation and tourism in the Croatian littoral

    Directory of Open Access Journals (Sweden)

    Slaven Gašparović

    2011-12-01

    Full Text Available The aim of this paper is to analyse and explain the impact of air transportation on the development of tourism in the Croatian littoral. The analysis was made by using the data collected from flight schedules and airport authorities. The data on frequency of lines and number of passengers were analysed in order to correlate the distribution of the number of passengers with the number of tourists during the year. In this case, the correlation between the number of passengers and the number of arrivals/number of overnight stays is observed. Data for the time period from 2008 till 2010 were analysed in more detail by dividing the passengers into four categories: full-service passengers, low-cost passengers, charter passengers and general aviation passengers. Major touristic markets are identified on the basis of the number of connections between European and Croatian littoral airports. The last part of the paper deals with the increasing impact of low-cost services on the development of tourism in the Croatian littoral region. This is due to the fact that low-cost carriers have accounted for a considerable part of air transport in the last few years.

  10. Eluma purpurascens, nieuw voor de Nederlandse fauna (Crustacea: Isopoda: Oniscoidea)

    NARCIS (Netherlands)

    Tempelman, D.; Berg, M.P.

    1997-01-01

    Eluma purpurascens, new for the Dutch fauna (Crustacea: Isopoda: Oniscoidea). The first Dutch specimen of Eluma purpurascens was found on 29 April 1994 on the Kaloot, east of Vlissingen, in the south-western province of Zeeland. One year later the species proved to be locally common along the southe

  11. Landpissebedden van de Ooijpolder: deel 1. verspreiding (Crustacea: Isopoda: Oniscidea)

    NARCIS (Netherlands)

    Wijnhoven, H.

    2000-01-01

    Terrestrial isopods of the Ooijpolder: part 1. distribution (Crustacea: Isopoda: Oniscidea) The distributions and habitats of woodlice were investigated in ‘the Ooijpolder’, also named ‘the Ooij’. The area of approximately 41 square kilometers is located along the river Waal, east of Nijmegen, Provi

  12. Methods applied in the large littoral mesocosms study of nutrient enrichment in rocky shore ecosystems - EULIT

    NARCIS (Netherlands)

    Bokn, T.L.; Hoell, E.E.; Kersting, K.; Moy, F.E.; Sorensen, K.

    2001-01-01

    Eight concrete land-based mesocosms have been set up for a study of the effect of nutrient enrichment on littoral hard bottom ecosystems. The construction of the mesocosms and the community establishment were initiated 2 yr ahead of the MAST-III project. The littoral communities were established by

  13. Littoral lichens as a novel source of potentially bioactive Actinobacteria.

    Science.gov (United States)

    Parrot, Delphine; Antony-Babu, Sanjay; Intertaglia, Laurent; Grube, Martin; Tomasi, Sophie; Suzuki, Marcelino T

    2015-10-30

    Cultivable Actinobacteria are the largest source of microbially derived bioactive molecules. The high demand for novel antibiotics highlights the need for exploring novel sources of these bacteria. Microbial symbioses with sessile macro-organisms, known to contain bioactive compounds likely of bacterial origin, represent an interesting and underexplored source of Actinobacteria. We studied the diversity and potential for bioactive-metabolite production of Actinobacteria associated with two marine lichens (Lichina confinis and L. pygmaea; from intertidal and subtidal zones) and one littoral lichen (Roccella fuciformis; from supratidal zone) from the Brittany coast (France), as well as the terrestrial lichen Collema auriforme (from a riparian zone, Austria). A total of 247 bacterial strains were isolated using two selective media. Isolates were identified and clustered into 101 OTUs (98% identity) including 51 actinobacterial OTUs. The actinobacterial families observed were: Brevibacteriaceae, Cellulomonadaceae, Gordoniaceae, Micrococcaceae, Mycobacteriaceae, Nocardioidaceae, Promicromonosporaceae, Pseudonocardiaceae, Sanguibacteraceae and Streptomycetaceae. Interestingly, the diversity was most influenced by the selective media rather than lichen species or the level of lichen thallus association. The potential for bioactive-metabolite biosynthesis of the isolates was confirmed by screening genes coding for polyketide synthases types I and II. These results show that littoral lichens are a source of diverse potentially bioactive Actinobacteria.

  14. Toxic effects of decomposing red algae on littoral organisms

    Science.gov (United States)

    Eklund, Britta; Svensson, Andreas P.; Jonsson, Conny; Malm, Torleif

    2005-03-01

    Large masses of filamentous red algae of the genera Polysiphonia, Rhodomela, and Ceramium are regularly washed up on beaches of the central Baltic Sea. As the algal masses start to decay, red coloured effluents leak into the water, and this tinge may be traced several hundred meters off shore. In this study, possible toxic effects of these effluents were tested on littoral organisms from different trophic levels. Effects on fertilisation, germination and juvenile survival of the brown seaweed Fucus vesiculosus were investigated, and mortality tests were performed on the crustaceans Artemia salina and Idotea baltica, as well as on larvae and adults of the fish Pomatoschistus microps. Fucus vesiculosus was the most sensitive species of the tested organisms to the red algal extract. The survival of F. vesiculosus recruits was reduced with 50% (LC50) when exposed to a concentration corresponding to 1.7 g l -1 dw red algae. The lethal concentration for I. baltica, A. salina and P. microps were approximately ten times higher. The toxicity to A. salina was reduced if the algal extract was left to decompose during two weeks but the decline in toxicity was not affected by different light or temperature conditions. This study indicates that the filamentous red algae in the central Baltic Sea may produce and release compounds with negative effects on the littoral ecosystem. The effects may be particularly serious for the key species F. vesiculosus, which reproduce in autumn when filamentous red algal blooms are most severe.

  15. Littoral cell angioma: review of the literature and case report.

    Science.gov (United States)

    Mokhtari, Navid; Hamidian Jahromi, Alireza; Dela Cruz, Nestora; Woodward, Aaron; Do, Daniel; Thomas-Ogunniyi, Jaiyeola O; Sangster, Guillermo

    2013-01-01

    Littoral cell angioma (LCA), a primary vascular neoplasm originating from splenic red pulp littoral cells, was initially thought to be an extremely rare pathology. There have been an increasing number of cases reported in the literature. However, the etiology and prevalence of LCA is still unclear, partly due to the rarity of cases. The association of LCA with internal organ cancers, specifically lymphoma, has also been reported. In the patients with a history of cancer/lymphoma, the accurate diagnosis of LCA as the cause of the splenomegaly is challenging. Here we present a case of LCA in a patient with non-Hodgkin B-cell lymphoma and alpha-thalassemia trait. To our knowledge, this is the first report of the coexistence of LCA and thalassemia and only the second report of LCA and marginal-zone non-Hodgkin B-cell lymphoma. We review the literature and discuss the radiologic and pathologic findings of this case compared with the previously reported cases.

  16. Zooplankton in littoral waters of a tropical lake: a revisited biodiversity.

    Science.gov (United States)

    Maia-Barbosa, P M; Peixoto, R S; Guimarães, A S

    2008-11-01

    The present study was carried out in Lake Dom Helvécio, in the state of Minas Gerais, with two main objectives: to demonstrate the contribution of the littoral zone, in order to better characterize zooplankton fauna; and to assess the distribution of zooplankton species in different habitats, i.e., the littoral zone with and without aquatic vegetation. The samples were collected in February and July 2006, throughout the littoral zone of the lake, in areas with and without aquatic vegetation. We identified a total of 188 species, of which 130 are new records for Lake Dom Helvécio. One hundred and eighty-four species were identified in the littoral zone with aquatic vegetation, and 117 in the zone with no vegetation. The higher zooplankton richness in areas of the littoral zone with aquatic vegetation can be related to the greater environmental heterogeneity. Compared to previous studies on the littoral zones of lakes along the middle River Doce, the present study expended greater sampling effort, and identified many more species. In relation to biological conservation, this study demonstrated the importance of the littoral zone for better characterization and conservation of the zooplankton fauna, especially when it is colonized by aquatic vegetation. Underestimating the richness of species may provide inaccurate data on the biota, as well as on the ecological conditions in an environment.

  17. Zooplankton in littoral waters of a tropical lake: a revisited biodiversity

    Directory of Open Access Journals (Sweden)

    PM. Maia-Barbosa

    Full Text Available The present study was carried out in Lake Dom Helvécio, in the state of Minas Gerais, with two main objectives: to demonstrate the contribution of the littoral zone, in order to better characterize zooplankton fauna; and to assess the distribution of zooplankton species in different habitats, i.e., the littoral zone with and without aquatic vegetation. The samples were collected in February and July 2006, throughout the littoral zone of the lake, in areas with and without aquatic vegetation. We identified a total of 188 species, of which 130 are new records for Lake Dom Helvécio. One hundred and eighty-four species were identified in the littoral zone with aquatic vegetation, and 117 in the zone with no vegetation. The higher zooplankton richness in areas of the littoral zone with aquatic vegetation can be related to the greater environmental heterogeneity. Compared to previous studies on the littoral zones of lakes along the middle River Doce, the present study expended greater sampling effort, and identified many more species. In relation to biological conservation, this study demonstrated the importance of the littoral zone for better characterization and conservation of the zooplankton fauna, especially when it is colonized by aquatic vegetation. Underestimating the richness of species may provide inaccurate data on the biota, as well as on the ecological conditions in an environment.

  18. Seaside, mountain and... wind turbines; Le littoral, la montagne et... les eoliennes

    Energy Technology Data Exchange (ETDEWEB)

    Gossement, A.

    2011-02-15

    Several courts have given a ruling considering that the law 'Montagne' (January 9., 1985) and the law 'Littoral' (January 3., 1986) are opposable to the building license of wind turbines. The law 'Littoral' imposes that any new construction in seaside areas has to be built in continuity of existing villages or hamlets. The law 'Montagne' imposes similar constraints to avoid the construction of isolated buildings in mountain areas but, contrary to the law 'Littoral', it allows some impairment for instance for the construction of certain public equipment. (A.C.)

  19. SUCCESSION OF LITTORAL ZOOPLANKTON COMMUNITIES OF THE BAKSHALYNSKE RESERVOIR

    Directory of Open Access Journals (Sweden)

    V. Trokhymets

    2016-09-01

    Full Text Available Purpose. The most pressing current environmental issues of scientific research include the studies of ecosystems altered by human impact. Aquatic ecosystems are important for the stable functioning of communal, industrial, agricultural and energy sectors. One of the typical examples of human impact on aquatic ecosystems is the transformation of river systems in the cascades of reservoirs. In southern Ukraine, there is a South Ukrainian energy complex, for the optimization of functioning of which the lower part of the Bakshala river was transformed into the Bakshalinske reservoir. The aim of this work was to study the succession of changes that occur in the reservoir using the littoral zooplankton communities as an example. These aquatic organisms are basic ecological group, sensitive to changes in their habitats. Methodology. When collecting and preserving samples of littoral zooplankton and its subsequent processing and analysis in the laboratory, we used both the standard methods and an original method of the standardization of the selection of monitoring stations depending on the type and size of the reservoir. Findings. The paper examines the peculiarities of succession processes in a small canyon-shaped Bakshalynske reservoir at different stages of the formation and functioning of its biota. The peculiarities of the succession of zooplanktonic cenoses in this reservoir were investigated by analyzing the changes in species diversity, faunal, ecological and trophic spectra, quantitative indicators, dominant communities and complexes of littoral zooplanktonic species. Originality. The data on zooplankton and other groups of aquatic organisms for the Bakshalynske reservoir are absent, so all provided data are original and have a scientific novelty. In addition, when collecting the material, we used new methodological approaches regarding the standardization of the selection of monitoring stations depending on the type and size of the reservoir

  20. Intersexuality in Crustacea: an environmental issue?

    Science.gov (United States)

    Ford, Alex T

    2012-02-01

    This paper aims to give a historical overview of current understanding about intersexuality in crustaceans, assesses gaps in our knowledge and asks whether it should be an environmental concern. The oldest known cases of intersexuality come from 70 million year old fossil crabs whilst the oldest published case of intersex crustacean stems from a 1730 Royal Society report of a gynandromorph lobster. Many crustacean species are sequential hermaphroditic or simultaneous hermaphrodites. Consequently, there has been confusion as to whether accounts of intersex in the literature are correct. Intersexuality is fairly common throughout the Crustacea and it has been suggested that intersex may arise through different mechanisms. For example, sexual gynandromorphism may arise through disruption in early embryonic development whereas intersexuality may also arise through perturbations of androgenic gland hormone and sexual differentiation in later development. The causes of intersex are multifaceted and can occur through a number of mechanisms including parasitism, environmental sex determination, genetic abnormalities and increasingly pollution is being implicated. Despite many studies on the effects of endocrine disrupters on crustaceans, very few have focussed on wild populations or male related endpoints; rather many laboratory studies have been attempting to assess biomarkers of feminisation. This is surprising as many of the seminal papers on endocrine disruption focussed on effects found in the wild and male specimens. This paper argues that we might have been addressing the right questions (i.e. pollution induced intersex), but in the wrong way (feminisation); and therefore gives recommendations for future directions for research. Biomarker development has been hampered by paucity of genomic and endocrine knowledge of many crustacean model species; however this is rapidly changing with the advent of cheaper affordable genomic techniques and high throughput sequencing.

  1. Endemism in the Cladocera (Crustacea: Branchiopoda) of Southern Africa

    OpenAIRE

    2013-01-01

    We review the current state of knowledge and patterns of distribution in the endemic Cladocera (Crustacea: Branchiopoda) of Southern Africa and describe two species of the Western Cape, of which one is new to science. Frey (1993), Korovchinsky (2006) and Smirnov (2008) previously suggested that South Africa harbours few endemics in the Cladocera. In the current study, we show that so-called low endemism in this region is mainly attributed to our limited state of knowledge of the local clado...

  2. An annotated checklist of the Cladocera (Crustacea: Branchiopoda) of Colombia.

    Science.gov (United States)

    Kotov, Alexey A; Fuentes-Reinés, Juan M

    2015-11-20

    Based on the revision of available literature on the Colombian Cladocera (Crustacea: Branchiopoda), we present an annotated checklist, with taxonomical comments for all taxa recorded since the start of research on this group in the country in 1913. We have listed 101 valid taxa, of which most records belong to the Caribbean region of Colombia. The situation in Colombian Cladocera taxonomy is, at present, unfavorable for any realistic conclusions on biodiversity, ecology and biogeography.

  3. Le littoral, vitrine du patrimoine géologique

    OpenAIRE

    Graviou, Pierrick

    2013-01-01

    La France, pays le plus visité au monde grâce à son patrimoine culturel, doit une partie de cette richesse à la variété géologique de son sous-sol. Cette variété se traduit notamment par l'existence de nombreux sites remarquables, particulièrement bien exposés sur le littoral où le jeu ambigu de l'érosion contribue à leur mise en valeur mais aussi à leur inéluctable destruction. Une protection de ce patrimoine est donc nécessaire, mais peut s'avérer inefficace dans certains cas....

  4. Edge detection of red hind grouper vocalizations in the littorals

    Science.gov (United States)

    Matthews, Cameron A.; Beaujean, Pierre-Philippe

    2016-05-01

    Littoral regions typically present to passive sensors as a high noise acoustic environment, particularly with respect to port and harbor regions where tidal variation, often characterized as pink, mixes with reverberation from on-shore business and commercial shipping, often characterized as white. Some fish in these regions, in particular epiphenalius Guttatus or more commonly the red hind grouper, emit relatively narrowband tones in low frequencies to communicate with other fish in such regions. The impact of anthropogenic noise sources on the red Hind and other fish is a topical area of interest for wildlife fisheries, private sportsmen and military offices that is not considered here; the fact that fish species continue to populate and communicate in these regions in the presence of high noise content lends some study to the signal content and modeling of a potential biologically inspired receiver structure.

  5. Response of littoral macrophytes to water level fluctuations in a storage reservoir

    National Research Council Canada - National Science Library

    Krolová, M; Čížková, H; Hejzlar, J; Poláková, S

    2013-01-01

    Lakes and reservoirs that are used for water supply and/or flow regulations have usually poorly developed littoral macrophyte communities, which impairs ecological potential in terms of the EU Water Framework Directive...

  6. N2O fluxes from the littoral zone of a Chinese reservoir

    National Research Council Canada - National Science Library

    M Yang; X M Geng; J Grace; Y F Jia; Y Z Liu; S W Jiao; L L Shi; C Lu; Y Zhou; G C Lei

    2015-01-01

    .... We report a case study that focuses on the littoral zone of a major Chinese reservoir, where we established measurements of N2O fluxes using the static chamber technique at five different water levels...

  7. Physical habitat structure of the lake shoreline and littoral zone -- How important is it?

    Science.gov (United States)

    The recent National Lakes Assessment (NLA) included the first national assessment of littoral and lakeshore physical habitat. It quantified water depth, surface characteristics, bank morphology, lake level fluctuations, substrate, fish concealment features, aquatic macrophytes, l...

  8. Impact of groyne fields on the littoral drift: A hybrid morphological modelling study

    DEFF Research Database (Denmark)

    Kristensen, S. E.; Drønen, N.; Deigaard, R.

    2016-01-01

    of this mechanism is presented including effects of scales, e.g. the effect of the relative length of the groynes (compared to the width of the surf zone).The model results indicate a strong dependency of the reduction in littoral drift on the initial geometric bypass ratio (Qgeo*), which is defined from the groyne......This paper concerns numerical modelling of the impact on the littoral drift and the shoreline from groynes forming a field of equidistant and identical groynes. The most important effect of a groyne on the shoreline morphology is that the littoral drift is blocked completely or partially. A local...... reduction in the littoral drift around the groyne introduces alongshore gradients in the alongshore sediment transport and sedimentation and erosion around the groyne which will cause re-orientation of the bed contours towards the prevailing wave direction until an equilibrium is reached. A discussion...

  9. Response of littoral macrophytes to water level fluctuations in a storage reservoir

    OpenAIRE

    Krolová M.; Čížková H.; Hejzlar J.; Poláková S.

    2013-01-01

    Lakes and reservoirs that are used for water supply and/or flow regulations have usually poorly developed littoral macrophyte communities, which impairs ecological potential in terms of the EU Water Framework Directive. The aim of our study was to reveal controlling factors for the growth of littoral macrophytes in a storage reservoir with fluctuating water level (Lipno Reservoir, Czech Republic). Macrophytes occurred in this reservoir only in the eulittoral zone i.e., the shoreline region be...

  10. Business Process Re-Engineering: Application for Littoral Combat Ship Mission Module Acquisition

    Science.gov (United States)

    2006-06-01

    9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) Program Executive Office, Littoral Mine Warfare 614 Sicard Street SE Stop 7003...in performance.” 10 From this perspective, a business seeking only a few more percentage points in sales or cost reductions most likely will not...27 Program Executive Office for Littoral Mine Warfare, “Power Point Brief for Dr. Delores Etter, ASN (RD&A) 30 Nov 2005. (Unpublished paper

  11. Response of littoral macrophytes to water level fluctuations in a storage reservoir

    OpenAIRE

    Krolová M.; Čížková H.; Hejzlar J.; Poláková S.

    2013-01-01

    Lakes and reservoirs that are used for water supply and/or flow regulations have usually poorly developed littoral macrophyte communities, which impairs ecological potential in terms of the EU Water Framework Directive. The aim of our study was to reveal controlling factors for the growth of littoral macrophytes in a storage reservoir with fluctuating water level (Lipno Reservoir, Czech Republic). Macrophytes occurred in this reservoir only in the eulittoral zone i.e., the shoreline region be...

  12. Littoral Hydrodynamics and Sediment Transport Around a Semi-Permeable Breakwater

    Science.gov (United States)

    2015-09-18

    Transport 1 Li, H., L. Lin, C.-C. Lu, C. Reed, and A. Shak (2015). Littoral Hydrodynamics and Sediment Transport around a Semi-Permeable Breakwater...Coasts and Ports 2015, Auckland, New Zealand, 15-18 September, 2015, 7 pp. Littoral Hydrodynamics and Sediment Transport Around a Semi...Dana Point Harbor requires a better understanding of hydrodynamics and sediment transport around a permeable breakwater. In this study, an integrated

  13. Wave-induced release of methane : littoral zones as a source of methane in lakes

    OpenAIRE

    Hofmann, Hilmar; Federwisch, Luisa; Peeters, Frank

    2010-01-01

    This study investigates the role of surface waves and the associated disturbance of littoral sediments for the release and later distribution of dissolved methane in lakes. Surface wave field, wave-induced currents, acoustic backscatter strength, and the concentration and distribution of dissolved methane were measured simultaneously in Lake Constance, Germany. The data indicate that surface waves enhance the release of dissolved methane in the shallow littoral zone via burst-like releases of...

  14. Quantitative characteristics of the littoral fauna of Grønfjorden Gulf (Spitsbergen) during winter and spring of 2016.

    Science.gov (United States)

    Zimina, O L; Meshcheryakov, N I

    2017-05-01

    The first description of the quantitative and qualitative compositions of the littoral fauna of Grønfjorden Gulf during the winter and spring period is given. Granulometric analysis of the surface sediments of the littoral has been performed. Thirty invertebrate taxa that did not leave the littoral zone during wintertime and could survive complete freezing during ebb have been identified. Species diversity and population density of the invertebrates were shown to depend on the granulometric size composition of the surface sediments.

  15. Effects of predation by Hydra (Cnidaria on cladocerans (Crustacea: Cladocera

    Directory of Open Access Journals (Sweden)

    Ligia Rivera-De la Parra

    2016-03-01

    Full Text Available Planktonic cladocerans have evolved different strategies to avoid predation from vertebrates; these include changes in morphology, behavior, physiology, and/or life-history traits. However, littoral cladocerans are better adapted to avoid invertebrate predation particularly from insect larvae by evolving morphological and physiological adaptations. Nevertheless, this has not been proven for some littoral predators such as Hydra. In this study, we provide quantitative data on how Hydra affects its zooplankton prey. We studied the predation behavior on Alona glabra, Ceridodaphnia dubia, Daphnia pulex, Daphnia cf. mendotae, Diaphanosoma birgei, Macrothrix triserialis, Moina macrocopa, Pleuroxus aduncus, Scapholeberis kingi, Simocephalus vetulus, Elaphoidella grandidieri, Brachionus rubens and Euchlanis dilatata. We also tested the indirect effect of allelochemicals from Hydra on the demography of Daphnia cf. mendotae. Littoral cladocerans are specially adapted to resist nematocyst injection and discharge of toxic substances from Hydra. A significant decrease in the population growth rate from 0.21 to 0.125 d-1 was observed at densities of 2 ind. ml-1. The role of carapace thickness as an adaptive strategy of littoral cladocerans against Hydra predation is discussed.

  16. The Littoral Station of Aguda, in the North of Portugal

    Science.gov (United States)

    Weber, M.

    1995-03-01

    The public authorities have recently approved the building of a Littoral Station in Aguda, a small fishing village on the Atlantic coast, 15 km south of the River Douro estuary in the municipal area of Vila Nova de Gaia. The internal structure of the building involves a Fishery Museum exhibiting ancient and modern gear, a Public Aquarium displaying the local marine fauna and flora and a Research and Educational Department for marine biology, aquaculture and fishery. The project was drawn up by the architect João Paulo Peixoto, in collaboration with local engineers, and the author. In Aguda there is an active, small-scale fishery, based on traditional methods handed down from generation to generation. The almost unstudied local marine fauna and flora is characterized by a high diversity of invertebrates and a rich abundance of fish stocks. Easy access to a variety of marine biotopes is guaranteed by means of the local fishing-fleet, thus supporting the Station's programme of education and research.

  17. CANCER IN THE CASPIAN LITTORAL AND NORTH WEST AREA

    Directory of Open Access Journals (Sweden)

    B. A Salmasizadeh

    1975-06-01

    Full Text Available Studies undertaken during the last 5 years in the Babol Research Station of the Institute of Public Health Research, Teheran University, with the collaboration of the International Agency for Research on Cancer in the Caspian Littoral and Ardabil area in the north of Iran has indicated the presence of cancer in 48 different sites. The five more prevalent types of cancer found in that area in order of their incidence are esophageal, stomach, skin, lung and liver cancers. Except for cancer of esophagus which occurs with a very high variation in incidence in the area, the incidence of other 4 does not significantly differ in various parts of the region. The incidence of esophageal cancer is maximum in the east and southeast of the area and it gradually decreases towards the reaching its minimum level in Gilan and increasing again to the west in Ardabil area. The incidence is higher among males in the low incidence, almost equal in the high incidence area except in Gombad area where is much higher among females than in males. The total number of cancer of soesophagus registered during the 5 years period is 1420 which constitute 1/10 of all cases reported. Of other types of cancer registered, cancers of skin, cervix uteri and lymphoma, mostly lymphosarcoma are more prevalent. Of the cancers of digestive tube, oesophageal is more prevalent in the east and stomach cancer in the west of the area.

  18. [Bacterial diversity in littoral wetland of Wuliangsuhai Lake].

    Science.gov (United States)

    Du, Ruifang; Li, Jingyu; Zhao, Ji

    2014-10-04

    The aim of this study was to analyze the bacterial diversity of land-water transition zone in littoral wetland of Wuliangsuhai Lake, and to study the effect of eutrophic substrate on the bacterial composition. The denaturing gradient gel electrophoresis (DGGE) with PCR-amplified 16S rDNA fragments was used to determine bacterial diversity, and the ordination technique of canonical correspondence analysis (CCA) was used to evaluate its effects on bacterial community composition. DGGE result shows that the microbial quantity decreased gradually from eutrophic lake sediment to desert soil. Diversity index analysis shows that the Shannon-Wiener index (H), Evenness index (E), richness index (S) and Simpson index (Ds) decreased gradually from water to land (eutrophic lake sediment > swamp sediment > saline soil > desert soil). Based on the sequencing results, there are 3 phyla in 4 samples, including Proteobacteria (78.6%), Acidobacteria (7.1%), Bacteroidetes (14.3%), Proteobacteria (52.6%) were dominant species, in which the Epsilon proteobacteria were predominant subgroup. The results of CCA suggest that that NH4+ -N, total nitrogen, organic carbon, total soluble salt, Cl- and K+ have most significant influenced the distribution of bands related species. The bacterial community structure of transition zone in Wuliangsuhai wetland differed significantly, and eutrophic relative factors had a strong impact on the bacterial community structure. This work presented a certain reference for the preliminary understanding of the bacterial composition and diversity and provided a scientific foundation for the research of spatial heterogeneity in this transition zone.

  19. Litorais da psicanálise Psychoanalysis littorals

    Directory of Open Access Journals (Sweden)

    Ana Costa

    2009-01-01

    Full Text Available Este trabalho se propõe a abordar algumas fronteiras estabelecidas pelo discurso analítico, principalmente com o campo da literatura. Sua principal referência se sustenta no tema dos "litorais", seguindo a proposição lacaniana criada pelo neologismo "lituraterra". Essa proposição, além de permitir construir interfaces da psicanálise com outros campos, também é o suporte para a produção dentro da própria psicanálise. Sua especificidade é a de constituir seu sujeito passando pela proposta de uma "extimidade", numa torsão na concepção corriqueira do dentro e fora. O tema que permitirá situar a construção dessas bordas situa-se na questão da escrita.This work intends to discuss some frontiers established by the psychoanalytical discourse, mainly with literature as a privileged field of dialogue. Its principal reference is supported by the subject of the "littoral", following the Lacanian proposition created by the neologism "lituraterre". This proposition allows us to build interfaces between psychoanalysis and other fields, and it is also the support for the production inside psychoanalysis itself. This approach is a reversion of the ordinary conception of the relationship between internal / external. The subject that will allow us to situate the construction of these edges concerns the question of the writing.

  20. 40 CFR 180.1071 - Peanuts, Tree Nuts, Milk, Soybeans, Eggs, Fish, Crustacea, and Wheat; exemption from the...

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 23 2010-07-01 2010-07-01 false Peanuts, Tree Nuts, Milk, Soybeans... Peanuts, Tree Nuts, Milk, Soybeans, Eggs, Fish, Crustacea, and Wheat; exemption from the requirement of a..., tree nuts, milk, soybeans, eggs (including putrescent eggs), fish, crustacea, and wheat are exempted...

  1. Holocene coastal dune fields used as indicators of net littoral transport: West Coast, USA

    Science.gov (United States)

    Peterson, C.D.; Stock, E.; Hart, R.; Percy, D.; Hostetler, S.W.; Knott, J.R.

    2010-01-01

    Between Point Grenville, Washington, and Point Conception, California (1500 km distance) 21 dune fields record longshore transport in 20 littoral cells during the late Holocene. The direction of predominant littoral transport is established by relative positions of dune fields (north, central, or south) in 17 representative littoral cells. Dune field position is north of cell midpoints in northernmost Oregon and Washington, but is south of cell midpoints in southern Oregon and California. Downdrift sand trapping occurs at significant changes in shoreline angle and/or at bounding headlands that project at least 2.5 km seaward from the general coastal trend. Sand bypassing occurs around small headlands of less than 0.5 km in projection distance. A northward shift of the winter low-pressure center in the northeast Pacific Ocean is modeled from 11 ka to 0 ka. Nearshore current forcing in southern Oregon and northern California switched from northward in earliest Holocene time to southward in late Holocene time. The late Holocene (5-0 ka) is generally characterized by net northward littoral drift in northernmost Oregon and Washington and by net southward littoral drift in southernmost Oregon and California. A regional divergence of net transport direction in central Oregon, i.e. no net drift, is consistent with modeled wind and wave forcing at the present time (0 ka). ?? 2009 Elsevier B.V.

  2. Hydrology is reflected in the functioning and community composition of methanotrophs in the littoral wetland of a boreal lake

    NARCIS (Netherlands)

    Siljanen, H.M.P.; Saari, A.; Krause, S.; Lensu, A.; Abell, G.C.J.; Bodrossy, L.; Bodelier, P.L.E.; Martikainen, P.J.

    2011-01-01

    In lake ecosystems a major proportion of methane emissions originate from the littoral zone which can have a great spatial variability in hydrology, soil quality and vegetation. Hitherto, spatial heterogeneity and the effects it has on functioning and diversity of methanotrophs in littoral wetlands

  3. Development of a regional littoral benthic macroinvertebrate multi-metric index (MMI) for lakes from the National Lakes Assessment

    Science.gov (United States)

    During the 2007 National Lakes Assessment (NLA) benthic macroinvertebrate samples were collected from the lake littoral zone. The purpose of the sampling was to assess the feasibility of a multi-metric index (MMI) to assess the condition of the littoral benthic macroinvertebrate...

  4. Nutrient Cycling and Retention Along a Littoral Gradient in a Dutch Shallow Lake in Relation to Water Level Regime

    NARCIS (Netherlands)

    Sollie, S.; Verhoeven, J.T.A.

    Littoral zones are characterized by gradients in depth and vegetation biomass, influencing nutrient retention capacity. A field experiment was conducted in a Phragmites australis dominated littoral zone to investigate nutrient retention and its effect on surface water quality. Measurements were done

  5. An Experimental Study of Mixture Corrosion Effects of Carbonate Rocks in the Transitional Zone of Littoral Karst Areas

    Institute of Scientific and Technical Information of China (English)

    陈鸿汉; 邹胜章; 朱远峰; 陈从喜

    2001-01-01

    The mechanism for development of littoral karst differs from that of inland karst, and the mixture corrosion effects are one of the most important factors that control the development of littoral karst. Through seven groups of static experiments carried out in a closed CO2-H2O system, basic conclusions can be drawn as follows: (1) the basic law of corrosion process in a transitional zone of seawater-freshwater in littoral karst areas is identical with that in the fresh water,i.e., the lithologic characteristics and rock structure are the main factors which control the development of littoral karst; (2)the mixture corrosion rate of the carbonate rock in the above transitional zone is faster than that in fresh water or seawater;(3) the mechanism for development of carbonate rocks differs at various pressures of CO2 in a transitional zone in littoral karst areas.``

  6. Lower respiration in the littoral zone of a subtropical shallow lake.

    Science.gov (United States)

    They, Ng Haig; da Motta Marques, David; Souza, Rafael Siqueira

    2012-01-01

    Macrophytes are important sources of dissolved organic carbon (DOC) to littoral zones of lakes, but this DOC is believed to be mostly refractory to bacteria, leading to the hypothesis that bacterial metabolism is different in littoral and pelagic zones of a large subtropical shallow lake. We tested this hypothesis by three approaches: (I) dissolved inorganic carbon (DIC) accumulation in littoral and pelagic water; (II) O(2) consumption estimate for a cloud of points (n = 47) covering the entire lake; (III) measurement of O(2) consumption and CO(2) accumulation in dark bottles, pCO(2) in the water, lake-atmosphere fluxes of CO(2) (fCO(2)) and a large set of limnological variables at 19 sampling points (littoral and pelagic zones) during seven extensive campaigns. For the first two approaches, DIC and O(2) consumption were consistently lower in the littoral zone, and O(2) consumption increased marginally with the distance to the nearest shore. For the third approach, we found in the littoral zone consistently lower DOC, total phosphorus (TP), and chlorophyll a, and a higher proportion of low-molecular-weight substances. Regression trees confirmed that high respiration (O(2) consumption and CO(2) production) was associated to lower concentration of low-molecular-weight substances, while pCO(2) was associated to DOC and TP, confirming that CO(2) supersaturation occurs in an attempt to balance phosphorus deficiency of macrophyte substrates. Littoral zone fCO(2) showed a tendency to be a CO(2) sink, whereas the pelagic zone showed a tendency to act as CO(2) source to the atmosphere. The high proportion of low-molecular-weight, unreactive substances, together with lower DOC and TP may impose lower rates of respiration in littoral zones. This effect of perennial stands of macrophytes may therefore have important, but not yet quantified implications for the global carbon metabolism of these lakes, but other issues still need to be carefully addressed before rejecting

  7. Littoral Decapods of Socorro Island, Revillagigedo Archipelago, Mexico

    Directory of Open Access Journals (Sweden)

    Silvia Mille-Pagaza

    2003-03-01

    Full Text Available Decapod community inhabiting the rocky littoral of eight bays from Socorro island, Revillagigedo Archipelago, was studied during March 1992. Samples were collected from one-square meter plots placed following transects drawn perpendicularly to the shoreline along the intertidal zone. Species richness and abundance were determined in each bay, as well as the similarity between bays using Morisita’s index. Organisms collected belong to six families, 20 genera and 26 species of the Brachyura and Anomura infraorders. Xanthidae was the family with the highest number of species, and the highest species richness was recorded at the V. Lozano bay. Pachygrapsus transversus, Xanthodius cooksoni and Calcinus explorator were the most abundant species in nearly all localities. Dendrogram obtained define two groups of bays at a similarity level above 0.67, given the similarity in the crab’s species richness and their abundance between bays in the island.Se estudió la comunidad de cangrejos del litoral rocoso de ocho bahías de la Isla Socorro, Archipiélago Revillagigedo en marzo de 1992. Las muestras fueron colectadas en cuadrantes de un m² a lo largo de transectos perpendiculares a la costa en la zona intermareal. Se determinó la riqueza específica, la abundancia por especie para cada bahía, así como la similitud entre bahías mediante el índice de Morisita. Los organismos colectados pertenecen a seis familias, 20 géneros y 26 especies de los infraordenes Brachyura y Anomura. La familia con el mayor número de especies fue Xanthidae y la mayor riqueza específica se registró en la bahía V. Lozano. Pachygrapsus transversus, Xanthodius cooksoni y Calcinus explorator fueron las más abundantes en casi todas las localidades. En el dendrograma se definen dos agrupaciones con nivel de similitud superior a 0.67, dada la semejanza en la riqueza específica de cangrejos y las abundancias entre las bahías.

  8. Population structure of the seabob shrimp Xiphopenaeus kroyeri (Heller, 1862 (Crustacea: Penaeoidea in the littoral of São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Rodrigo H. Castro

    2005-03-01

    Full Text Available The population structure of the penaeidean shrimp Xyphopenaeus kroyeri was studied in Ubatuba Bay, Ubatuba, São Paulo, Brazil. The period and site of juvenile recruitment were monitored using a monthly sampling design with eight fixed areas (transects from September 1995 to August 1996. The population structure was assessed using size frequency distributions (based on carapace length for each month and sampling area. Females were significantly larger than males, suggesting a differential growth between sexes. The very low occurrence of large adults in the Bay can be related to offshore migration for reproduction. Recruitment occurred throughout the year, with a peak during the summer, when the highest recruitment rates were obtained along inshore transects. The present investigation revealed valuable information on the biology of the species mainly in the study region, which is considered a nursery ground for juveniles of X. kroyeri. The species showed an important variation from the typical life cycle that it is assumed to hold over its entire range and X. kroyeri should be classified as having a life cycle different from that proposed previously in the literature, i.e. the juveniles prefer inshore areas instead of estuaries. Some suggestions for the seabob fishery management are proposed as an alternative for minimising the impact during the harvest period and adjusting the protection schedule.

  9. Regional Sediment Budget of the Columbia River Littoral Cell, USA

    Science.gov (United States)

    Buijsman, Maarten C.; Sherwood, C.R.; Gibbs, A.E.; Gelfenbaum, G.; Kaminsky, G.M.; Ruggiero, P.; Franklin, J.

    2002-01-01

    Summary -- In this Open-File Report we present calculations of changes in bathymetric and topographic volumes for the Grays Harbor, Willapa Bay, and Columbia River entrances and the adjacent coasts of North Beach, Grayland Plains, Long Beach, and Clatsop Plains for four intervals: pre-jetty - 1920s (Interval 1), 1920s - 1950s (Interval 2), 1950s - 1990s (Interval 3), and 1920s 1990s (Interval 4). This analysis is part of the Southwest Washington Coastal Erosion Study (SWCES), the goals of which are to understand and predict the morphologic behavior of the Columbia River littoral cell on a management scale of tens of kilometers and decades. We obtain topographic Light Detection and Ranging (LIDAR) data from a joint project by the U.S. Geological Survey (USGS), National Oceanic and Atmospheric Administration (NOAA), National Aeronautic and Space Administration (NASA), and the Washington State Department of Ecology (DOE) and bathymetric data from the U.S. Coast and Geodetic Survey (USC&GS), U.S. Army Corps of Engineers (USACE), USGS, and the DOE. Shoreline data are digitized from T-Sheets and aerial photographs from the USC&GS and National Ocean Service (NOS). Instead of uncritically adjusting each survey to NAVD88, a common vertical land-based datum, we adjust some surveys to produce optimal results according to the following criteria. First, we minimize offsets in overlapping surveys within the same era, and second, we minimize bathymetric changes (relative to the 1990s) in deep water, where we assume minimal change has taken place. We grid bathymetric and topographic datasets using kriging and triangulation algorithms, calculate bathymetric-change surfaces for each interval, and calculate volume changes within polygons that are overlaid on the bathymetric-change surfaces. We find similar morphologic changes near the entrances to Grays Harbor and the Columbia River following jetty construction between 1898 and 1916 at the Grays Harbor entrance and between 1885 and

  10. Do lake littoral benthic invertebrates respond differently to eutrophication, hydromorphological alteration, land use and fish stocking?

    Directory of Open Access Journals (Sweden)

    Šiling Rebeka

    2016-01-01

    Full Text Available In order to provide adequate guidelines in freshwater management, managers need reliable bioindicators that can respond differently to varied stressors. Managers also have to consider hierarchical structure of environmental factors. Thus, our research aims to test the independence of taxa responses along environmental gradients and to examine in what order natural and anthropogenic factors constrain the structure of littoral benthic assemblages. The rank of explained variance of littoral benthic assemblage's variable group hierarchy was: land use > landscape characteristics > eutrophication > fish stocking > hydromorphological alteration. We determined nine gradients (two natural and seven stressor gradients, separated into five groups based on statistically significant differences in responsiveness of taxa. Apart from responsiveness to natural factors, littoral benthic invertebrates could be used as bioindicators for stressors reflecting urbanization, eutrophication, hydromorphological alteration and fish stocking. The taxonomical composition of littoral benthic invertebrates, especially when taxa with preference for certain relatively narrow environmental conditions along gradients are present, can be used to identify effects of key stressors. Our findings have profound implications for ecological assessment and management of lakes, as they indicate that benthic invertebrates can be used when the effects of multiple stressors need to be disentangled.

  11. Littoral Cell Angioma in a Patient with Crohn’s Disease

    Directory of Open Access Journals (Sweden)

    Joel Johansson

    2015-01-01

    Full Text Available Littoral cell angioma is a rare vascular tumor of the spleen. The pathogenesis is unknown but the lesion is associated with several malignancies and immunological disorders. The diagnosis requires histopathological examination. The malignant potential of this lesion is unknown, which is why splenectomy is recommend for all cases. Symptomatic cases generally suffer from hypersplenism and pyrexia. A previously healthy 20-year-old female was diagnosed with colonic Crohn’s disease; as part of the work-up a magnetic resonance enterography was performed which showed multiple signal changes of the spleen. The patient reported chronic abdominal pain in the left upper quadrant, malaise, and fever. The unknown splenic lesions prompted a laparoscopic splenectomy; pathology revealed a littoral cell angioma. The abdominal pain and malaise remitted but the fever persisted one year despite adequate treatment of the patient’s Crohn’s disease. Littoral cell angioma is associated with immune-dysregulation including Crohn’s disease with several reported cases. Signs and symptoms of hypersplenism and splenic lesions on imaging should raise suspicion of littoral cell angioma in patients with Crohn’s disease. Magnetic resonance enterography to assess disease severity in Crohn’s disease may provide an opportunity to study the prevalence and natural history of this rare splenic tumor.

  12. Littoral zones in shallow lakes. Contribution to water quality in relation to water level regime

    NARCIS (Netherlands)

    Sollie, S.

    2007-01-01

    Littoral zones with emergent vegetation are very narrow or even lacking in Dutch shallow lakes due to a combination of changed water level regime and unfavorable shore morphometry. These zones are important as a habitat for plants and animals, increasing species diversity. It has also been demonstra

  13. Lomé et ses environs (Togo) : inondations et évolution du littoral ...

    African Journals Online (AJOL)

    ... et les nouveaux arrivants ont construit leurs habitations dans les zones marginales ... l'évolution et l'impact du climat sur la vulnérabilité de la population et, ... Keywords: Lomé, flooding, pluviometry, littoral, coastal erosion, climatic refugee.

  14. Life on the boundary: Environmental factors as drivers of habitat distribution in the littoral zone

    Science.gov (United States)

    Cefalì, Maria Elena; Cebrian, Emma; Chappuis, Eglantine; Pinedo, Susana; Terradas, Marc; Mariani, Simone; Ballesteros, Enric

    2016-04-01

    The boundary between land and sea, i.e. the littoral zone, is home to a large number of habitats whose distribution is primarily driven by the distance to the sea level but also by other environmental factors such as littoral's geomorphological features, wave exposure, water temperature or orientation. Here we explore the relative importance of those major environmental factors that drive the presence of littoral rocky habitats along 1100 Km of Catalonia's shoreline (Spain, NW Mediterranean) by using Geographic Information Systems and Generalized Linear Models. The distribution of mediolittoral and upper infralittoral habitats responded to different environmental factors. Mediolittoral habitats showed regional differences drawn by sea-water temperature and substrate type. Wave exposure (hydrodynamism), slope and geological features were only relevant to those mediolittoral habitats with specific environmental needs. We did not find any regional pattern of distribution in upper infralittoral habitats, and selected factors only played a moderate role in habitat distribution at the local scale. This study shows for the first time that environmental factors determining habitat distribution differ within the mediolittoral and the upper infralittoral zones and provides the basis for further development of models oriented at predicting the distribution of littoral marine habitats.

  15. Diatoms of the marine littoral of Steenberg's cove in St. Helena Bay, Cape province, South Africa

    CSIR Research Space (South Africa)

    Malcolm, HG

    1973-01-01

    Full Text Available In a series of previous investigation of the marine littoral of the South African coast, the author has made observations at the various localities along the shores of the Eastern Cape Province. All these stations are situated along the shores...

  16. Littoral zones in shallow lakes. Contribution to water quality in relation to water level regime

    NARCIS (Netherlands)

    Sollie, S.

    2007-01-01

    Littoral zones with emergent vegetation are very narrow or even lacking in Dutch shallow lakes due to a combination of changed water level regime and unfavorable shore morphometry. These zones are important as a habitat for plants and animals, increasing species diversity. It has also been

  17. Patterns of extracellular enzyme activities in littoral sediments of Lake Gooimeer, The Netherlands

    NARCIS (Netherlands)

    Boschker, H.T.S.; Cappenberg, T.E.

    1998-01-01

    The seasonal variation in enzymatic activities against protein and several polysaccharides together with esterase as a measure of general hydrolytic activity was studied in a transect of sediments through the littoral zone of Lake Gooimeer, The Netherlands. Absolute activities showed a linear

  18. Decomposition of organic matter in the littoral sediments of a lake

    NARCIS (Netherlands)

    Boschker, H.T.S.

    1997-01-01

    This thesis deals with the microbial decomposition of organic matter in littoral sediments of lakes. Special attention was given to the initial step in the decomposition of polysaccharides that form a major component of macrophyte litter produced in these systems. This initial step, an

  19. Atmospheric refraction effects on optical-infrared sensor performance in a littoral-maritime environment

    NARCIS (Netherlands)

    Fritz, P.; Moerman, M.M.; Jong, A.N.; Leeuw, G. de; Winkel, H.

    2004-01-01

    During a number of transmission experiments over littoral waters, quantitative measurements of atmospheric refraction phenomena were carried out to determine the range performance of optical–IR sensors. Examples of distortion and intensity gain generated by spatial variations of the atmospheric

  20. Ultraestrutura do espermatozóide de Ucides cordatus Linnaeus (Crustacea, Ocypodidae do litoral norte do Brasil Ultrastructure of spermatozoon of the crab Ucides cordatus Linaeus (Crustacea, Decapoda of the northern littoral of Brazil

    Directory of Open Access Journals (Sweden)

    Edilson Matos

    2000-09-01

    Full Text Available Ultrastructure of spermatozoa of the crab Ucides cordatus Linnaeus, 1763 is described and illustrated. Three parts can be distinguished: 1. the elongate-ovoid acrosome located anteriorly; 2. the cytoplasmic region; and 3. the nuclear region. The acrosome is composed of a thick electron-dense wall and a less electron-dense subacrosomal space. The cytoplasm region connects the acrosome with the nucleus, and three arms filled with microtubules arise from this region. The nucleus is polymorphous. The spermatozoon of Ucides cordatus follows the general pattern described for other Decapods.

  1. Dune Ecosystem Management of the Razim-Sinoie Littoral Bar (Romania

    Directory of Open Access Journals (Sweden)

    Gheorghe ROMANESCU

    2010-12-01

    Full Text Available The Razim-Sinoie lagoon complex is located in the south-eastern part of Romania. It is bordered by the Dobrudja region to the west and north, the Danube Delta to the north-east and the Black Sea to the east. An assessment of the quality of dunes was made in that area and several conservation measures were proposed. The age of the Razim-Sinoie littoral bar cannot be older than 1500 - 2000 years, according to to the total closure of the Halmyris bay and the end of the harbour activities in Histria and, subsequently, in Enisala. Transversally, the littoral bar is quite symmetrical, with few differences between the part towards the sea, which is more abrupt, and the less abrupt part towards the lagoon. Most of the sediments that make up the littoral bar are of Danubian origin and the rest are of marine origin (bio-constructional, caused by the smashing of the empty shells. The materials get transported by the littoral stream and deposited by waves and wind. The average increase of the marine level is between 1 and 2 cm/year. Even if the transgressive phenomenon occurs along the entire bar, several sectors are slightly eroded (as in Portita, others are slightly progradated (as in Chituc-Capul Midia and the rest have a precarious relative equilibrium (Periboina, Periteasca. The reduced water transparency facilitates a good development of the shell population, and causes the terrigenic material/organogenic material ratio (T/O to be 50/50. As a result of the reduction of the Danube solid discharge which supplied the littoral bar, the whole alignment was affected, and, consequently, a generalized retreat of the shore line occurred. Under such circumstances, a supplementary sediment discharge was necessary, but without affecting the nearby ecosystems. Supplementary material can be brought from offshore, from the - 20m deep isobath or by building canals between the Sfantu Gheorghe arm of the Danube (the southernmost arm and the littoral nearby. In that

  2. Thermally driven interaction of the littoral and limnetic zones by autumnal cooling processes

    Directory of Open Access Journals (Sweden)

    Kolumban HUTTER

    2005-02-01

    Full Text Available In autumn, during the transition period, shores influence the interior dynamics of large temperate lakes by the formation of horizontal water-temperature gradients between the shallow and deep areas, whilst vertical temperature gradients are smoothed by convection due to surface cooling. A simple heat budget model, based on the heat balance of the water column without horizontal advection and turbulent mixing, allows deduction of the time-dependent difference between the mean temperature within the littoral area and the temperature in the upper mixed layer. The model corroborates that littoral areas cool faster than regions distant from shores, and provides a basis for an estimation of structure of flows from the beginning of cooling process till the formation of the thermal bar. It predicts the moment in the cooling process, when the corresponding density difference between the littoral and limnetic parts reaches a maximum. For a linear initial vertical temperature profile, the time-dependent "target depth" is explicitly calculated; this is the depth in the pelagic area with a temperature, characteristic of the littoral zone. This depth is estimated as 4/3 of the (concurrent thickness of the upper mixed layer. It is shown that, for a linear initial vertical temperature profile, the horizontal temperature profile between the shore and the lake has a self-similar behavior, and the temperature difference between the littoral waters and the upper mixed off-shore layer, divided by the depth of the upper mixed layer, is an invariant of the studied process. The results are in conformity with field data.

  3. Reference values for feeding parameters of isopods (Porcellioscaber, Isopoda, Crustacea).

    Science.gov (United States)

    Drobne, Damjana; Drobne, Samo

    2014-01-01

    The advantage of using terrestrial isopods in toxicity studies is that a battery of parameters can be tested at different levels of biological complexity. Feeding parameters for example link organism level response to potential ecological consequences but a problem with using feeding parameters in toxicity tests with terrestrial isopods is their high variability. The aim of our study was to set benchmark values for feeding parameters for isopod Porcellioscaber (Isopoda, Crustacea) in laboratory-controlled experiments. In the work presented here, the daily feeding rate of the central 50% of the control population of Porcellioscaber and a correlation between feeding rate and isopod weight were set. Values outside these ranges need additional evaluation to increase the relevance of test outcomes. We suggest using benchmark values for feeding parameters as well as the coefficient of variation (a) to identify animals with altered feeding parameters with respect to controls, and (b) to assess the data quality in each experiment.

  4. RNA interference with special reference to combating viruses of crustacea.

    Science.gov (United States)

    La Fauce, Kathy; Owens, Leigh

    2012-09-01

    RNA interference has evolved from being a nuisance biological phenomenon to a valuable research tool to determine gene function and as a therapeutic agent. Since pioneering observations regarding RNA interference were first reported in the 1990s from the nematode worm, plants and Drosophila, the RNAi phenomenon has since been reported in all eukaryotic organisms investigated from protozoans, plants, arthropods, fish and mammals. The design of RNAi therapeutics has progressed rapidly to designing dsRNA that can specifically and effectively silence disease related genes. Such technology has demonstrated the effective use of short interfering as therapeutics. In the absence of a B cell lineage in arthropods, and hence no long term vaccination strategy being available, the introduction of using RNA interference in crustacea may serve as an effective control and preventative measure for viral diseases for application in aquaculture.

  5. Changes in ventilation and locomotion of Gammarus pulex (Crustacea, Amphipoda) in response to low concentrations of pharmaceuticals

    NARCIS (Netherlands)

    Lange, de H.J.; Peeters, E.T.H.M.; Lürling, M.F.L.L.W.

    2009-01-01

    Exposure to contaminants below lethal concentrations may affect the performance of organisms, resulting in measurable differences in behavior. We measured the response of the benthic invertebrate Gammarus pulex (Crustacea, Amphipoda) to sublethal concentrations of three pharmaceuticals, fluoxetine,

  6. Reports on the impact of Caulerpa lentillifera by alien free-living isopod Paracerceis sculpta (Crustacea, Isopoda, Sphaeromatidae)

    National Research Council Canada - National Science Library

    太田, 悠造

    2014-01-01

    Unidentified free-living isopods (Crustacea, Sphaeromatidae) occurring in an important commercial seaweed bed of Caulerpa lentillifera at Miyako-jima island, southern Japan, are identified herein Paracerceis sculpta (Holmes, 1904...

  7. Littoral Combat Ship: Navy Complied with Regulations in Accepting Two Lead Ships, but Quality Problems Persisted after Delivery

    Science.gov (United States)

    2014-09-01

    25GAO, Littoral Combat Ship: Deployment of USS Freedom Revealed Risks in Implementing Operational Concepts and Uncertain Costs...Honorable Thad Cochran Ranking Member Committee on Appropriations Subcommittee on Defense United States Senate The Honorable Howard P. “Buck” McKeon...Management Needed Prior to Further Investments. GAO-14-749. Washington, D.C.: July 30, 2014. Littoral Combat Ship: Deployment of USS Freedom Revealed Risks

  8. Distribution of Mysidium integrum (Tattersall) (Crustacea-mysidacea) in Venezuelan coral habitats

    NARCIS (Netherlands)

    Zoppi de Roa, Evelyn; Pedro Alonso, G.

    1997-01-01

    ZOPPI DE ROA, EVELYN & PEDRO ALONSO G.: Distribution of Mysidium integrum (Tattersall) (Crustacea: Mysidacea) in Venezuelan coral habitats. Studies Nat. Hist. Caribbean Region 73, Amsterdam 1997: 55-62. This paper reports the occurrence, distribution and some ecological aspects of mysids in six cora

  9. Phylogeny and evolution of life history strategies of the Parasitic Barnacles (Crustacea, Cirripedia, Rhizocephala)

    DEFF Research Database (Denmark)

    Glenner, Henrik; Hebsgaard, Martin Bay

    2006-01-01

    The barnacles (Crustacea, Cirripedia) consist of three well-defined orders: the conventional filter-feeding barnacles (Thoracica), the burrowing barnacles (Acrothoracica), and the parasitic barnacles (Rhizocephala). Thoracica and Acrothoracica feed by catching food particles from the surrounding ...... crustaceans (Anomura), which includes hermit crabs and squat lobsters....

  10. Hyloniscus riparius: een lang onopgemerkte landpissebed in Nederland (Crustacea, Isopoda: Trichoniscidae)?

    NARCIS (Netherlands)

    Wijnhoven, H.

    1993-01-01

    Hyloniscus riparius: an unnoticed terrestrial wood-louse in the Netherlands (Crustacea, Isopoda: Trichoniscidae) ? Until recently Hyloniscus riparius was only recorded from The Netherlands from green-houses in the Botanical Garden at Utrecht. More recently material was collected in the Ooy Polder. I

  11. Porcellium conspersum, een in Nederland zeer zeldzame landpissebed van vochtige bossen (Crustacea: Isopoda: Oniscoidea)

    NARCIS (Netherlands)

    Soesbergen, M.

    1999-01-01

    The influence of recent inundations on the distribution pattern of the isopod Eluma purpurascens in the province of Zeeland (Crustacea: Isopoda: Oniscoidea) Small scale mapping of Eluma purpurascens Budde-Lund, 1885 in the province of Zeeland revealed a remarkable distribution pattern. The species p

  12. Mysidacea (Crustacea) from the Minicoy lagoon (Lakshadweep, India) with description of a new species of Anisomysis

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Panampunnayil, S.U.; Prabhakaran, M.P.

    .M.Garret, U.S.N. commanding, 27. Memoirs of the Museum of Comparative Zo?logy, Harvard College. 35: 175-296. Murano M. 1994. Anisomysis (Paranisomysis) ohtsukai (Crustacea, Mysidacea), a new mysid from Japan. Bulletin of National Science Museum, Tokyo 20...

  13. Immunocytochemical studies on the naupliar nervous system of Balanus improvisus (Crustacea, Cirripedia, Thecostraca)

    DEFF Research Database (Denmark)

    Semmler, Henrike; Wanninger, Andreas; Høeg, Jens T;

    2008-01-01

    neurons in the protocerebrum, along the circumoesophageal connectives and in the mandibular ganglion stain only for serotonin. Due to the almost complete absence of comparable data on the neuroanatomy of early (naupliar) stages in other Crustacea, we include immunocytochemical data on the larvae...

  14. Assessment of susceptibility to pollution in littoral waters using the concept of recovery time.

    Science.gov (United States)

    Gómez, Aina G; Juanes, José A; Ondiviela, Bárbara; Revilla, José A

    2014-04-15

    Susceptibility to pollution can be related to the flushing capacity of aquatic systems. Transport time scales constitute a useful tool for representing the water exchange and transport processes. A new transport time scale, recovery time, and a methodology to estimate it by means of numerical models is hereby developed. Recovery time, calculated in Gijon, Santander and Tarragona harbours, is significantly related to physical, chemical and biological water quality indicators. Susceptibility, assessed through recovery time values, provides spatial patterns of expected flushing capacity, being sensitive to physical and hydrodynamic characteristics. The developed method is appropriate to estimate recovery time and assess susceptibility against pollution in littoral waters having great potential to be applied to different disciplines. Recovery time could be used in littoral waters as a surrogate of water quality indicators, to establish efficient monitoring programs, to define and characterize modified water bodies or to improve the design of marine infrastructures.

  15. A rare case of splenic littoral cell angioma in a child

    Directory of Open Access Journals (Sweden)

    Recep Bedir

    2014-01-01

    Full Text Available Littoral cell angioma (LCA is a rare, benign primary vascular neoplasm of the spleen. The tumor originates from the littoral cells lining the sinuses of the red pulp of the spleen. Preoperative distinction of this tumor from other benign or malign splenic lesions is difficult. Radiologically most cases present as multiple nodules. Definitive diagnosis can only be made histopathologically and immunohistochemically following splenectomy. This clinical situation can coexist with various malignancies and autoimmune disorders. Even though, it is mostly benign, since it has the potential to become malignant after splenectomy, long-term follow-up is required. We present an LCA case, which appeared as a solitary mass in the spleen of an 11-year-old girl with abdominal pain admitted to our hospital.

  16. Ecotoxicological effects of metal pollution in two mollusc species from the Spanish South Atlantic littoral

    Energy Technology Data Exchange (ETDEWEB)

    Funes, V. [Department of Biochemistry and Molecular Biology, University of Cordoba, Campus de Rabanales, Edificio Severo Ochoa, 14071 Cordoba (Spain); Alhama, J. [Department of Biochemistry and Molecular Biology, University of Cordoba, Campus de Rabanales, Edificio Severo Ochoa, 14071 Cordoba (Spain); Navas, J.I. [CIFPA ' Agua del Pino' , IFAPA, Consejeria de Innovacion, Ciencia y Empresa, Junta de Andalucia. Aptdo. 104, 21071 Huelva (Spain); Lopez-Barea, J. [Department of Biochemistry and Molecular Biology, University of Cordoba, Campus de Rabanales, Edificio Severo Ochoa, 14071 Cordoba (Spain); Peinado, J. [Department of Biochemistry and Molecular Biology, University of Cordoba, Campus de Rabanales, Edificio Severo Ochoa, 14071 Cordoba (Spain)]. E-mail: bb1pepej@uco.es

    2006-01-15

    Metal accumulation and some of their biochemical effects have been studied in oysters (Crassostrea angulata) and mussels (Mytilus galloprovincialis) of the South Atlantic Spanish littoral. Especial attention has been paid to antioxidant defences and oxidative damage to biomolecules. Deep differences in the response of oysters and mussels to metal pollution were found. Oysters, with the higher metal loads of both species, showed increased antioxidant defences, and less extensive oxidative damage. In contrast, mussels, which accumulated much lower metal concentrations, showed clear increases in oxidized biomolecules, in agreement with their low increases in the antioxidant defence mechanisms. Our results suggest that mussels are more sensitive and less well adapted to metal pollution, probably explaining their absence in the most contaminated studied site, Mazagon. We conclude that oysters can be used as more sensitive bioindicator of pollution in the South Spanish littoral, and as a suitable model to study the adaptation to metal pollution. - Oysters adapt to metal pollution while mussels are more sensitive.

  17. Studies on parasitic fungi of plants occurring in the lake littoral of the Masurian Lakeland

    Directory of Open Access Journals (Sweden)

    Bożena Durska

    2014-11-01

    Full Text Available In the years 1969-1970 the parasitie mycoflora of plants occurring in the littoral of 51 lakes of the Olsztyn and Mrągowo lake distriets and inthe Land of Great Lakes was examined. 132 species of parasitic fungi on the 150 vascular plants species were found, 6 of them for the first time in Poland, and 9 on hosts hitherto not observed in Poland. The influence of ecological factors such as the zone of the littoral, the position and irradiation of the coast etc. on the occurrence of pathogens was noted. The effect of some pathogenes on the transpiration, level of nitrogen and phosphorus, calorific value and yield of host plants wasalso examined, maily for Phragmites communis Trin.

  18. A comparison of pelagic, littoral, and riverine bacterial assemblages in Lake Bangongco, Tibetan Plateau.

    Science.gov (United States)

    Liu, Yongqin; Priscu, John C; Yao, Tandong; Vick-Majors, Trista J; Michaud, Alexander B; Jiao, Nianzhi; Hou, Juzhi; Tian, Lide; Hu, Anyi; Chen, Zhong-Qiang

    2014-08-01

    Lakes of the Tibetan Plateau lack direct anthropogenic influences, providing pristine high-altitude (> 4000 m) sites to study microbial community structure. We collected samples from the pelagic, littoral, and riverine zones of Lake Bangongco, located on the western side of the Plateau, to characterize bacterial community composition and geochemistry in three distinct, but hydrologically connected aquatic environments during summer. Bacterial community composition differed significantly among zones, with communities changing from riverine zones dominated by Bacteroidetes to littoral and pelagic zones dominated by Gammaproteobacteria. Community composition was strongly related to the geochemical environment, particularly concentrations of major ions and total nitrogen. The dominance of Gammaproteobacteria in the pelagic zone contrasts with typical freshwater bacterial communities as well as other lakes on the Tibetan Plateau. © 2014 Federation of European Microbiological Societies. Published by John Wiley & Sons Ltd. All rights reserved.

  19. Littoral Combat Ship (LCS) Civilian Aviation Alternative Support Study: Report of Findings and Recommendations

    Science.gov (United States)

    2006-07-30

    team initiated and developed Cutter Manpower Documents for all cutters from the 82’ Point Class to the 378’ Hamilton Class. In the acquisition arena...activities such that, beyond that point , they amount to participating actively and directly in hostilities. In a rear area, the Navy and DoD would likely...Littoral and Mine Warfare (PMS 420) 614 Sicard St SE (Stop 7003) Washington Navy Yard 47. Washington, DC 20376-7003Philip Marshall – MarshallHP

  20. Security enhancement of littoral combat ship class utilizing an autonomous mustering and pier monitoring system

    OpenAIRE

    Stubblefield, Philip N.

    2010-01-01

    Approved for public release; distribution is unlimited Littoral Combat Ships (LCS) are designed and built to have minimum crew sizes thus, while the ship is in port, there are fewer crewmembers to facilitate pier monitoring, security, and conducting mustering of personnel. The crew of LCS ships presently have too many responsibilities to ensure 100% coverage of the Pier area 100% of the time, and cannot manually maintain a real time muster of all ships personnel. This lack of coverage a...

  1. Suitability of Taxodium distichum for Afforesting the Littoral Zone of the Three Gorges Reservoir.

    Science.gov (United States)

    Li, Bo; Du, Chunlan; Yuan, Xingzhong; Willison, J H Martin; Xiao, Hongyan

    2016-01-01

    The littoral zone ecosystem of the Three Gorges Reservoir (TGR) has become significantly degraded by annual cycles of prolonged winter flooding and summer drought. For purposes of flood control and sediment management, the water level in the reservoir is lowered by 30 m during the summer monsoon season and raised again to 175 m above sea level each year at the end of the monsoon period. To explore an effective way to promote biodiversity and associated ecosystem services, we examined Taxodium distichum as a species for afforesting the littoral zone. Sapling growth variations were measured after two rounds of winter flooding. Dominant influence factors were determined by redundancy analysis. Herb community similarities between the experimental afforested areas and nearby control areas were assessed to detect the ecosystem influence of the experimental afforestation. 94.5% of saplings planted at elevations above 168 m survived. All measured growth indices (tree height, diameter at breast height, crown width and foliage density) decreased as the flood depth increased. Completely submerged saplings had a mean dieback height of -0.65 m. Greater initial foliage density led to increased tree height and stem diameter. Shannon-Wiener indices were not significantly different between plots in experimental and control areas, but the low similarity of herb communities between experimental and control areas (0.242 on average) suggested that afforestation would enrich plant community structure and improve littoral zone ecosystem stability. Because littoral zone afforestation provides several ecosystem services (habitat, carbon sink, water purification and landscaping), it is a promising revegetation model for the TGR.

  2. Littoral Infrared Ship Self Defence Technology Studies (Autodefense cotiere infrarouge des navires etudes technologiques)

    Science.gov (United States)

    2014-05-01

    Modeling Radiometry Ship signature control Surveillance 14. Abstract Task Group Number 51 (RTG-51/SET-088), titled “Littoral Infrared Ship...Centre Renaissancelaan 30, 1000 Bruxelles Armaments Department ITALIE 9-11, Drumul Taberei Street CANADA Centro Gestione Conoscenza Sector 6...Distribučné a Defence R&D Canada informačné stredisko STO Department of National Defence ITALY Demänová 393 305 Rideau Street, 9th Floor Centro Gestione

  3. Nouveaux loisirs, nouveaux espaces: les fonds sous-marins du littoral languedocien

    Directory of Open Access Journals (Sweden)

    Frédéric Galinier

    2000-06-01

    Full Text Available L’exploration des fonds sous-marins fascine un nombre croissant de jeunes citadins. Le littoral de l’Hérault, même bas et peu rocheux, ne fait pas exception à la règle et l’activité subaquatique s’y développe. Les effets n’en sont pas négligeables pour les revenus de certaines communes littorales, ainsi que sur l’environnement.

  4. Seasonal variations in pore water and sediment geochemistry of littoral lake sediments (Asylum Lake, MI, USA)

    OpenAIRE

    Miller Douglas; Haas Johnson R; Koretsky Carla M; Ndenga Noah T

    2006-01-01

    Abstract Background Seasonal changes in pore water and sediment redox geochemistry have been observed in many near-surface sediments. Such changes have the potential to strongly influence trace metal distribution and thus create seasonal fluctuations in metal mobility and bioavailability. Results Seasonal trends in pore water and sediment geochemistry are assessed in the upper 50 cm of littoral kettle lake sediments. Pore waters are always redox stratified, with the least compressed redox str...

  5. Trophic partitioning among three littoral microcrustaceans: relative importance of periphyton as food resource

    Directory of Open Access Journals (Sweden)

    Alexandre Bec

    2012-07-01

    Full Text Available The high species richness of zooplankton communities in macrophytes littoral zones could result from the diversity of potential trophic niches found in such environment. In macrophytes littoral zones, in addition to phytoplankton, neustonic, benthic and epiphytic biofilms can also be potential components of the microcrustacean diet. Here, we investigated the ability of three large cladocerans: Daphnia longispina, Simocephalus vetulus and Eurycercus lamellatus, to develop on periphyton as their only food source or as a complement to a phytoplankton resource in scarce supply. D. longispina exhibited a very low growth and reproduction rates on the periphytic resource and as S. vetulus seems unable to scrape on periphyton. In contrast, E. lamellatus could not grow on phytoplankton, and appears to be an obligatory periphyton scraper. This latter finding contrasts with previous studies suggesting that E. lamellatus could be able to scrap periphyton as well as filter-feed on suspended matter. These differences in feeding strategy probably reflect the different trophic niches occupied by these three species in macrophytes littoral zones, and may explain at least in part their ability to coexist in the same environment.

  6. Characteristics of the lactation, chemical composition milk hygiene quality of the Littoral-Dinaric ass

    Directory of Open Access Journals (Sweden)

    Ante Ivanković

    2009-06-01

    Full Text Available Milk production is one of the possible economic uses of donkey population. The Littoral- Dinaric donkey is numerous, but the structural changes in rural areas during the last decade have pushed it into a group of endangered genetic heritage. The aim of this research is to determine the production potential, lactation characteristics, chemical composition and hygienic quality of the Littoral-Dinaric ass milk. The average milk production was 172.12 mL per milking with the average fat percentage of 0.33 %, milk protein 1.55 %, and lactose 6.28 %. The low average number of somatic cells and bacterial count are noticed in ass’s milk (4.09 mL log-1; 3.58 mL log-1. A significant influence of lactation stage on the milk quantity and proportion of dry matter (P<0.01, as well on the proportion of milk fat and milk protein (P<0.05, was observed. Also the influence of the season on productivity, and the proportion of dry matter and milk fat (P<0001, as well as milk protein (P<0.01 was also significant. Productivity of the Littoral-Dinaric ass in the pasture system is relatively modest, but the direct and indirect benefits from this kind of production are multiple. That is the reason to continue the development of donkey milk production technology.

  7. Between tide and wave marks: a unifying model of physical zonation on littoral shores

    Directory of Open Access Journals (Sweden)

    Christopher E. Bird

    2013-09-01

    Full Text Available The effects of tides on littoral marine habitats are so ubiquitous that shorelines are commonly described as ‘intertidal’, whereas waves are considered a secondary factor that simply modifies the intertidal habitat. However mean significant wave height exceeds tidal range at many locations worldwide. Here we construct a simple sinusoidal model of coastal water level based on both tidal range and wave height. From the patterns of emergence and submergence predicted by the model, we derive four vertical shoreline benchmarks which bracket up to three novel, spatially distinct, and physically defined zones. The (1 emergent tidal zone is characterized by tidally driven emergence in air; the (2 wave zone is characterized by constant (not periodic wave wash; and the (3 submergent tidal zone is characterized by tidally driven submergence. The decoupling of tidally driven emergence and submergence made possible by wave action is a critical prediction of the model. On wave-dominated shores (wave height ≫ tidal range, all three zones are predicted to exist separately, but on tide-dominated shores (tidal range ≫ wave height the wave zone is absent and the emergent and submergent tidal zones overlap substantially, forming the traditional “intertidal zone”. We conclude by incorporating time and space in the model to illustrate variability in the physical conditions and zonation on littoral shores. The wave:tide physical zonation model is a unifying framework that can facilitate our understanding of physical conditions on littoral shores whether tropical or temperate, marine or lentic.

  8. Between tide and wave marks: a unifying model of physical zonation on littoral shores.

    Science.gov (United States)

    Bird, Christopher E; Franklin, Erik C; Smith, Celia M; Toonen, Robert J

    2013-01-01

    The effects of tides on littoral marine habitats are so ubiquitous that shorelines are commonly described as 'intertidal', whereas waves are considered a secondary factor that simply modifies the intertidal habitat. However mean significant wave height exceeds tidal range at many locations worldwide. Here we construct a simple sinusoidal model of coastal water level based on both tidal range and wave height. From the patterns of emergence and submergence predicted by the model, we derive four vertical shoreline benchmarks which bracket up to three novel, spatially distinct, and physically defined zones. The (1) emergent tidal zone is characterized by tidally driven emergence in air; the (2) wave zone is characterized by constant (not periodic) wave wash; and the (3) submergent tidal zone is characterized by tidally driven submergence. The decoupling of tidally driven emergence and submergence made possible by wave action is a critical prediction of the model. On wave-dominated shores (wave height ≫ tidal range), all three zones are predicted to exist separately, but on tide-dominated shores (tidal range ≫ wave height) the wave zone is absent and the emergent and submergent tidal zones overlap substantially, forming the traditional "intertidal zone". We conclude by incorporating time and space in the model to illustrate variability in the physical conditions and zonation on littoral shores. The wave:tide physical zonation model is a unifying framework that can facilitate our understanding of physical conditions on littoral shores whether tropical or temperate, marine or lentic.

  9. Advancing Littoral Zone Aerosol Prediction via Holistic Studies in Regime-Dependent Flows

    Science.gov (United States)

    Solbrig, J. E.; Miller, S. D.; van den Heever, S.; Kreidenweis, S. M.; Zhang, J.; Holz, R.; Zupanski, M.; Wang, J.; Oo, M. M.; Albers, S. C.; Atwood, S. A.; Igel, A. L.; Kliewer, A.

    2016-12-01

    The land/sea interface presents a uniquely complex environment running the gamut of observational and predictive challenges related to atmospheric aerosol. The diverse and ephemeral nature of littoral zone meteorology produces complex flow-dependent spatial distributions, diverse mixtures of aerosol species from myriad sources, and evolving aerosol optical properties that evolve rapidly over space and time. In turn, these challenges present significant complications to various applications related to visibility and optical propagation. The littoral zone's profusion of surface and air mass discontinuities, combined with `bright water' backgrounds, preclude our ability to characterize aerosol properties via conventional satellite remote sensing techniques. Here we present an overview and early results of a new Multi-University Research Initiative (MURI), conducted under the auspices of the Office of Naval Research (ONR), designed to observe, characterize, assimilate, predict the evolution of aerosols in the littoral zone. The research takes an holistic approach to the problem, in which in-situ characterization, satellite remote sensing, data assimilation, and high resolution modeling sensitivity studies are coupled in order to arrive at a deeper, more interconnected understanding of aerosol processes in this challenging regime.

  10. Water Level Effects on Growth of Melaleuca Seedlings from Lake Okeechobee (Florida, USA) Littoral Zone.

    Science.gov (United States)

    LOCKHART; AUSTIN; AUMEN

    1999-05-01

    / The invasive exotic wetland tree, Melaleuca quinquenervia, is expanding rapidly throughout seasonally wet areas of southern Florida (USA), including the littoral zone of Lake Okeechobee. Natural resource managers are concerned that a lower lake level regulation schedule under consideration for Lake Okeechobee, while potentially beneficial to overall ecosystem health, might increase the rate of Melaleuca expansion. To investigate this possibility, Melaleuca saplings (harvested from the littoral zone) and 7-week-old seedlings (grown from harvested seeds) were subjected to various hydroperiod treatments in replicated mesocosms. Hydroperiod treatments were selected based on a simulation of historical water level variations. Saplings grew taller under longer hydroperiods with fluctuating water levels, including periods of submersion. Time since germination affected the response of seedlings to inundation. Submersed 7-week-old seedlings grew slower and had less biomass than submersed 12-week-old seedlings, yet mortality was low at both ages. Melaleuca's plasticity allows it to adapt to hypoxic, aquatic conditions by means of aquatic heterophylly and adventitious roots. Algae and drought also increased mortality. Based on faster growth of Melaleuca under longer hydroperiods and its adaptability to seasonal flooding, a lower lake regulation schedule may not stimulate its expansion. Therefore, water levels should not be manipulated only to control Melaleuca. Control of Melaleuca should continue using current practices such as manual removal or chemical treatment. KEY WORDS: Melaleuca; Lake Okeechobee; Littoral zone; Water level; Regulation schedule

  11. Impacts to Dungeness Crab from the Southwest Washington Littoral Drift Restoration Project

    Energy Technology Data Exchange (ETDEWEB)

    Williams, Greg D.; Kohn, Nancy P.; Pearson, Walter H.; Skalski, J R.

    2005-11-09

    The Benson Beach littoral drift restoration project is a demonstration project that will replenish sand on Benson Beach, the public beach north of the North Jetty at the mouth of the Columbia River (MCR), using material dredged from the river during normal maintenance dredging of the navigational channel. A U.S. Army Corps of Engineers (Corps) proposal involves pumping the material from a sump area on the south side of the jetty to Benson Beach using a cutter suction dredge, also known as a pipeline dredge. If this one-time demonstration project proves feasible and successful, up to a million cubic yards of sediment could be used to replenish the outer coast littoral drift system in successive years by the same process. The primary goal of this study was to assess the potential risk of impacts to Dungeness crab from the proposed Benson Beach littoral drift restoration process of using the cutter suction dredge to move sediment from the proposed sump area on one side of the North Jetty to the beach on the other side of the jetty. Because there are no direct measurements of crab entrainment by pipeline dredge operating outside of the lower Columbia River navigation channel, dredge impacts for the proposed demonstration project were estimated using a modification of the dredge impact model (DIM) of Armstrong et al. (1987). The model estimates adult equivalent loss (AEL) of crabs using crab population density from trawl surveys, dredge project information (gear type, season, location, volume), and an entrainment function relating crab population density to entrainment by the dredge. The input used in applying the DIM to the Benson Beach littoral drift restoration included the specific dredging scenario provided by the Corps, existing data on crab density in previously proposed sump areas, and a series of entrainment functions. A total of fourteen scenarios were modeled and the outcomes compared with six reference scenarios intended to represent realistic to worst cases

  12. Impacts to Dungeness Crab from the Southwest Washington Littoral Drift Restoration Project

    Energy Technology Data Exchange (ETDEWEB)

    Williams, Greg D.; Kohn, Nancy P.; Pearson, Walter H.; Skalski, J R.

    2005-11-09

    The Benson Beach littoral drift restoration project is a demonstration project that will replenish sand on Benson Beach, the public beach north of the North Jetty at the mouth of the Columbia River (MCR), using material dredged from the river during normal maintenance dredging of the navigational channel. A U.S. Army Corps of Engineers (Corps) proposal involves pumping the material from a sump area on the south side of the jetty to Benson Beach using a cutter suction dredge, also known as a pipeline dredge. If this one-time demonstration project proves feasible and successful, up to a million cubic yards of sediment could be used to replenish the outer coast littoral drift system in successive years by the same process. The primary goal of this study was to assess the potential risk of impacts to Dungeness crab from the proposed Benson Beach littoral drift restoration process of using the cutter suction dredge to move sediment from the proposed sump area on one side of the North Jetty to the beach on the other side of the jetty. Because there are no direct measurements of crab entrainment by pipeline dredge operating outside of the lower Columbia River navigation channel, dredge impacts for the proposed demonstration project were estimated using a modification of the dredge impact model (DIM) of Armstrong et al. (1987). The model estimates adult equivalent loss (AEL) of crabs using crab population density from trawl surveys, dredge project information (gear type, season, location, volume), and an entrainment function relating crab population density to entrainment by the dredge. The input used in applying the DIM to the Benson Beach littoral drift restoration included the specific dredging scenario provided by the Corps, existing data on crab density in previously proposed sump areas, and a series of entrainment functions. A total of fourteen scenarios were modeled and the outcomes compared with six reference scenarios intended to represent realistic to worst cases

  13. Remarkable convergent evolution in specialized parasitic Thecostraca (Crustacea

    Directory of Open Access Journals (Sweden)

    Crandall Keith A

    2009-04-01

    Full Text Available Abstract Background The Thecostraca are arguably the most morphologically and biologically variable group within the Crustacea, including both suspension feeders (Cirripedia: Thoracica and Acrothoracica and parasitic forms (Cirripedia: Rhizocephala, Ascothoracida and Facetotecta. Similarities between the metamorphosis found in the Facetotecta and Rhizocephala suggests a common evolutionary origin, but until now no comprehensive study has looked at the basic evolution of these thecostracan groups. Results To this end, we collected DNA sequences from three nuclear genes [18S rRNA (2,305, 28S rRNA (2,402, Histone H3 (328] and 41 larval characters in seven facetotectans, five ascothoracidans, three acrothoracicans, 25 rhizocephalans and 39 thoracicans (ingroup and 12 Malacostraca and 10 Copepoda (outgroup. Maximum parsimony, maximum likelihood and Bayesian analyses showed the Facetotecta, Ascothoracida and Cirripedia each as monophyletic. The better resolved and highly supported DNA maximum likelihood and morphological-DNA Bayesian analysis trees depicted the main phylogenetic relationships within the Thecostraca as (Facetotecta, (Ascothoracida, (Acrothoracica, (Rhizocephala, Thoracica. Conclusion Our analyses indicate a convergent evolution of the very similar and highly reduced slug-shaped stages found during metamorphosis of both the Rhizocephala and the Facetotecta. This provides a remarkable case of convergent evolution and implies that the advanced endoparasitic mode of life known from the Rhizocephala and strongly indicated for the Facetotecta had no common origin. Future analyses are needed to determine whether the most recent common ancestor of the Thecostraca was free-living or some primitive form of ectoparasite.

  14. Two new species of Floresorchestia (Crustacea, Amphipoda, Talitridae) in Thailand.

    Science.gov (United States)

    Wongkamhaeng, Koraon; Dumrongrojwattana, Pongrat; Pattaratumrong, Manasawan Saengsakda

    2016-01-01

    The beach-hopper and land-hopper genus Floresorchestia Bousfield, 1984 is most widespread in terrestrial and marine littoral habitats and has been recorded from the South African coasts through to tropical Indo-Pacific and Caribbean Sea. In Thailand, there is only Floresorchestia samroiyodensis Azman, Wongkamhaeng & Dumrongrojwattana, 2014 reported from the swamp of Prachuab Kiri Khan, southern Thailand. In this work, two new species of Floresorchestia from Phutsa Reservoir in Nakhon Ratchasima and the man-made swamp in Burapha University are described. The new species are characterised by the mandible left lacinia mobilis 4-dentate; the posterior margin of merus, carpus and propodus covered in palmate setae; the uropod 3 peduncle with two robust setae and the telson longer than broad. The characters of the specimens are described and illustrated in this paper. All specimens are deposited in the Princess Maha Chakri Sirindhorn Natural History Museum, Prince of Songkla University, Thailand.

  15. [Microbial sulfate reduction in sediments of the coastal zone and littoral of the Kandalaksha bay of the White sea].

    Science.gov (United States)

    Savvichev, A S; Rusanov, I I; Iusupov, S K; Baĭramov, I T; Pimenov, N V; Lein, A Iu; Ivanov, M V

    2003-01-01

    Microbiological and biogeochemical investigations of the coastal zone and the littoral of the Kandalaksha Bay of the White Sea were carried out. The material for investigations was obtained in the series of expeditions of the Institute of Microbiology, Russian Academy of Sciences, in August 1999, 2000, 2001, and in March 2003. The studies were conducted on the littoral and in the water area of the Kandalaksha Preserve, the Moscow University Belomorsk Biological Station, and the Zoological Institute Biological Station, Russian Academy of Sciences, Sediment sampling on the littoral was carried out in the typical microlandscapes differing in the sediment properties and macrobenthos distribution. The maximal sulfate reduction rate (SRR) was shown for the shallow part of the Chemorechenskaya Bay (up to 2550 micrograms S/(dm3 day)) and in the Bab'ye More Bay (up to 3191 micrograms S/(dm3 day)). During the winter season, at a temperature of -0.5-0.5 degrees C, the SRR in the sediments of the Kartesh Bay was 7.9-13 micrograms S/(dm3 day). In the widest limits, the SRR values varied in the sediment cores sampled on the littoral. The minimal values (11 mu]g S/(dm3 day)) were obtained in the core samples on the silt-sandy littoral. The littoral finely dispersed sediments rich in organic matter were characterized by high SRR values (524-1413 micrograms S/(dm3 day)). The maximal SRR values were shown for the sediments present within the stretch of decomposing macrophytes, in local pits at the lower littoral waterline, and in the mouth of a freshwater stream (51-159 mg S/(dm3 day)). A sharp difference in the level of H2S production in the type microlandscapes was shown. The average hydrogen sulfide production in finely dispersed sediments constituted 125 mg S/(m2 day); in stormy discharge deposits, 1950 mg S/(m2 day); in depressions under stones and in silted pits, 4300 mg S/(m2 day). A calculation made with regard to the area of microlandscapes with increased productivity shows

  16. Structure of the littoral fish assemblage in an impounded tributary: the effects of macrophytes presence (subtropical region, Brazil).

    Science.gov (United States)

    Hermes-Silva, S; Zaniboni-Filho, E

    2012-08-01

    To evaluate the effects of macrophytes presence in the structure of littoral fish assemblages in the littoral zone, monthly samples were collected from September, 2006 to August, 2007 in an impounded tributary of the Itá Reservoir, the Fragosos River, located in the Upper Uruguay River Basin. Fish were collected using a beach seine and sampling was conducted in the littoral zone inside a macrophyte stand and in an area with no macrophytes. A total of 5,191 fish were captured during the study period. Fish assemblage attributes (fish abundance, species richness, and diversity) varied significantly between sampling months and areas. The abundance of Astyanax cf. bimaculatus, Astyanax fasciatus, Geophagus brasiliensis, and Gymnotus carapo also varied significantly between sampling months and areas. Detrended Correspondence Analysis showed a clear spatial segregation at the first axis and a slight temporal segregation at the second axis. These results were confirmed by Multiple Response Permutation Procedure analysis. Apparently, the presence of the aquatic macrophytes is not the only factor influencing the distribution of littoral fish assemblages in the Fragosos River. Littoral fish seem to be taking advantage of low- to medium-sized macrophyte stands, but few species used maximum-sized stands.

  17. Habitat degradation and seasonality affect physiological stress levels of Eulemur collaris in littoral forest fragments.

    Directory of Open Access Journals (Sweden)

    Michela Balestri

    Full Text Available The littoral forest on sandy soil is among the most threatened habitats in Madagascar and, as such, it represents a hot-spot within a conservation hot-spot. Assessing the health of the resident lemur fauna is not only critical for the long-term viability of these populations, but also necessary for the future re-habilitation of this unique habitat. Since the Endangered collared brown lemur, Eulemur collaris, is the largest seed disperser of the Malagasy south-eastern littoral forest its survival in this habitat is crucial. In this study we compared fecal glucocorticoid metabolite (fGCM levels, a measure of physiological stress and potential early indicator of population health, between groups of collared brown lemurs living in a degraded forest fragment and groups occurring in a more preserved area. For this, we analysed 279 fecal samples collected year-round from 4 groups of collared brown lemurs using a validated 11-oxoetiocholanolone enzyme immunoassay and tested if fGCM levels were influenced by reproductive stages, phenological seasons, sex, and habitat degradation. The lemurs living in the degraded forest had significantly higher fGCM levels than those living in the more preserved area. In particular, the highest fGCM levels were found during the mating season in all animals and in females during gestation in the degraded forest. Since mating and gestation are both occurring during the lean season in the littoral forest, these results likely reflect a combination of ecological and reproductive pressures. Our findings provide a clear indication that habitat degradation has additive effects to the challenges found in the natural habitat. Since increased stress hormone output may have long-term negative effects on population health and reproduction, our data emphasize the need for and may add to the development of effective conservation plans for the species.

  18. Using catenas for GIS-based mapping of NW Mediterranean littoral habitats

    Science.gov (United States)

    Mariani, Simone; Cefalì, Maria Elena; Terradas, Marc; Chappuis, Eglantine; Ballesteros, Enric

    2014-06-01

    Studies aimed at describing habitats and mapping their distributions are pivotal to implementing management plans and to effectively guide conservation measures. We developed a novel approach of data collection and entry (CAT-LIT) to establish a detailed cartography of the littoral habitats found along the Catalan coast (Spain). Field data were recorded using coded, two-digit hierarchical lists (e.g. Aa, Ab, etc.) of horizons found at each point along the coast, called catenas. The horizons were either dominated by species (on the rocky bottoms) or sediment types (on the beaches) and corresponded to LPRE, EUNIS and CORINE habitats. Catenas were transferred into a database and calculations about the extent of bottom types, habitats, and catenas themselves along the coast were carried out with GIS tools. In addition, habitat link richness was calculated and represented using network analysis programs. The application of CAT-LIT to the Catalan coast showed that the habitats dominated by the lichen Verrucaria amphibia and the flattened barnacle Euraphia depressa and those dominated by the barnacle Chthamalus spp. were almost ubiquitous. Those dominated by the red alga Corallina elongata, the mussel Mytilus galloprovincialis and the red alga Rissoella verruculosa were also common. Because of the frequency of their connections, those habitats formed a huge hub of links in the networks. By using catenas, the habitats can be viewed using GIS based programs keeping the catena as the main informational and ecological unit. The catenas allow maximum compactness when vertically distributed habitats are to be shown on a 2D map. The complete cartography and dataset on the spatial distribution of the littoral habitats from Catalonia is valuable for coastal management and conservation to study changes in the habitat distribution and relate such changes to anthropogenic pressures. Furthermore, the CAT-LIT can be easily adapted to shores of other seas and oceans to obtain accurate

  19. Nitrous oxide fluxes from the littoral zone of a lake on the Qinghai-Tibetan Plateau.

    Science.gov (United States)

    Chen, Huai; Wang, Meng; Wu, Ning; Wang, Yanfen; Zhu, Dan; Gao, Yongheng; Peng, Changhui

    2011-11-01

    Nitrous oxide (N(2)O) fluxes were measured in six littoral mirco-zones of Lake Huahu on Qinghai-Tibetan Plateau in the peak growing season of years of 2006 and 2007. The weighted mean N(2)O flux rate was 0.08 mg N m(-2) h(-1) (ranged from -0.07 to 0.35 mg N m(-2) h(-1)). The result was relatively high in the scope of N(2)O fluxes from boreal and temperate lakes. Emergent plant zones (Hippuris vulgaris and Glyceria maxima stands) recorded the highest N(2)O flux rate (0.11 ± 0.24 and 0.08 ± 0.17 mg N m(-2) h(-1), respectively). Non-vegetated lakeshore recorded the lowest N(2)O flux (0.03 ± 0.11 mg N m(-2) h(-1)), lower than that from the floating mat zone of Carex muliensis (0.05 ± 0.18 mg N m(-2) h(-1)), the floating-leaved plant zone of Polygonum amphibium (0.07 ± 0.11 mg N m(-2) h(-1)), and the wet meadow (0.07 ± 0.15 mg N m(-2) h(-1)). Standing water depths were important factors to explain such spatial variations in N(2)O fluxes. Significant temporal variations in N(2)O fluxes were also found. Such temporal variation in N(2)O flux in the littoral zone may be dependent on the interaction of water regime and thermal conditions, instead of the latter solely. These results showed the importance of the littoral zone of lake, especially the emergent plant zone, as a hotspot of N(2)O fluxes in such grazing meadows.

  20. Benthic suspension feeders: their paramount role in littoral marine food webs.

    Science.gov (United States)

    Gili, J M; Coma, R

    1998-08-01

    In recent years, particular attention has been paid to coupling and energy transfer between benthos and plankton. Because of their abundance, certain benthic suspension feeders have been shown to have a major impact in marine ecosystems. They capture large quantities of particles and might directly regulate primary production and indirectly regulate secondary production in littoral food chains. Suspension feeders develop dense, three-dimensional communities whose structural complexity depends on flow speed. It has been postulated that these communities can self-organize to enhance food capture and thus establish boundary systems capable of successfully exploiting a less structured system, namely, the plankton.

  1. Fauna of gastropod molluscs in the Curonian Lagoon littoral biotopes (Baltic Sea, Kaliningrad region, Russia

    Directory of Open Access Journals (Sweden)

    Dmitry Filippenko

    2011-12-01

    Full Text Available A survey of the gastropod mollusc fauna in the coastal waters of the southern part of the Curonian Lagoon (Kaliningrad region, Russia were carried out. Study revealed 34 aquatic gastropods representing 30% of Prosobranchia and 70% of Pulmonata. Obtained data showed higher mollusc diversity in the littoral biotopes in comparison with open areas of the Lagoon. The fauna is represented by a typical Central European species complex of freshwater gastropods. The reed zone along the coastline in the Lagoon functions as a barrier and provides shallow water habitats with slow moving and warmer water, where maximum gastropod species concentrate.

  2. Le tourisme littoral en France : un état des lieux

    OpenAIRE

    Zeghni, Sylvain

    2015-01-01

    Avec 5500 kms de côtes en trois façades maritimes, le littoral français est l'un des atouts majeurs d'attractivité de notre pays. Il n'en reste pas moins que les difficultés liées à l'érosion, à la sur-fréquentation et à une hôtellerie souvent vétuste, posent la question de l'avenir de ce type de tourisme en France.

  3. Les nouveaux outils au service de la diffusion des photographies anciennes du littoral

    OpenAIRE

    Meillon, Julien; Quimbert, Erwann; Satra Le Bris, Catherine; Treguer, Mickael

    2015-01-01

    Depuis 2003 et la découverte dans une salle d’archives d’albums contenant plus de 10.000 photos anciennes du littoral, un important travail de géoréférencement et de mise à disposition de ces photos a été fait. Cela fait plus de 10 ans maintenant que l’Ifremer, au travers de son IDG Sextant, diffuse ces photographies anciennes datant de 1919 à 1958. De nombreux financeurs ont ainsi participé aux traitements de ces données permettant aujourd’hui d’avoir une couverture quasi exhaustive ...

  4. New littoral mite species (Acari, Oribatida, Fortuyniidae) from the Galápagos archipelago, with ecological and zoogeographical considerations.

    Science.gov (United States)

    Pfingstl, Tobias; Schatz, Heinrich

    2017-03-17

    Two species of Fortuyniidae, found on the Galápagos Islands (Ecuador) are described and illustrated based on the adult and juvenile instars. Alismobates galapagoensis sp. nov. was found on six islands of the archipelago, in littoral and supralittoral habitats. It is morphologically similar to A. inexpectatus Pfingstl & Schuster, 2012 from Bermuda, but differs from that species and all other known congeners by a prominent cuticular ridge on epimeron III among other unique character combinations. Litoribates caelestis gen. and sp. nov. was found on the islands Santa Cruz and Bartolomé in the littoral zone under Maytenus and mangroves. Notes on distribution and ecological preferences of both species are included.

  5. Reference values for feeding parameters of isopods (Porcellio scaber, Isopoda, Crustacea)

    OpenAIRE

    Damjana Drobne; Samo Drobne

    2014-01-01

    Abstract The advantage of using terrestrial isopods in toxicity studies is that a battery of parameters can be tested at different levels of biological complexity. Feeding parameters for example link organism level response to potential ecological consequences but a problem with using feeding parameters in toxicity tests with terrestrial isopods is their high variability. The aim of our study was to set benchmark values for feeding parameters for isopod Porcellio scaber ( Isopoda , Crustacea ...

  6. Reference values for feeding parameters of isopods ( Porcellio scaber , Isopoda , Crustacea )

    OpenAIRE

    Damjana Drobne; Samo Drobne

    2014-01-01

    Abstract The advantage of using terrestrial isopods in toxicity studies is that a battery of parameters can be tested at different levels of biological complexity. Feeding parameters for example link organism level response to potential ecological consequences but a problem with using feeding parameters in toxicity tests with terrestrial isopods is their high variability. The aim of our study was to set benchmark values for feeding parameters for isopod Porcellio scaber ( Isopoda , Crustacea ...

  7. Spatial distribution and general population characteristics of Pseudanchialina pusilla (Crustacea: Mysida) in the eastern Arabian Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.

    in a fast maturation of the individuals, allowing the production of many generations per year. Due to continuous breeding, determining the number of generations becomes more complex (Mees et al., 1994; Delgado, 1997) because generations overlap...: Mysidacea) in a sand beach in south Brazil. Revista Brasileira de Zoologia, 25 (3): 403–412. 9 Delgado L., Guerao G. & Ribera C. 1997. Biolgy of the mysid Mesopodopsis slabberi (van Beneden, 1861) (Crustacea, Mysidacea) in a coastal lagoon of the Ebro...

  8. Macroepizoísmo em Libinia ferreirae (Crustacea, Brachyura, Majidae Macroepizoites on Libinia ferreirae (Crustacea, Brachyura, Majidae

    Directory of Open Access Journals (Sweden)

    Vanessa C. Winter

    2006-06-01

    Full Text Available Um estudo de distribuição dos macroepizóicos foi realizado numa população do caranguejo-aranha Libinia ferreirae Brito Capello, 1871 proveniente do litoral dos estados do Paraná e de Santa Catarina. O material biológico foi obtido junto aos pescadores, e faz parte do rejeito de pesca. Os caranguejos foram mensurados e os macroepizóicos identificados e contados. Os seguintes macroepizóicos sésseis foram registrados: Calliactis tricolor (Lesueur, 1817 (Cnidaria; Actiniaria (Cnidaria; Arca sp. (Mollusca; Ostreidae (Mollusca; Acanthodesia tenuis (Desor, 1848 (Bryozoa; Cirripedia e duas espécies tubícolas de Gammaridea (Crustacea. Além destes organismos ocorreram dois tubos desabitados e quatro animais vágeis. A anêmona C. tricolor foi a espécie mais abundante e freqüente, sendo, provavelmente, utilizada como mecanismo de camuflagem pelo caranguejo. O macroepizoísmo em L. ferreirae está relacionado com a idade ou tamanho do caranguejo, tendo maior incidência naqueles mais velhos ou de maior porte. Entretanto, a densidade dos macroepizóicos por caranguejo se mantém em torno de três. Não há relação entre o macroepizoísmo e o sexo do hospedeiro; somente fêmeas ovígeras utilizam desse recurso mais freqüentemente do que as não-ovígeras. Devido à maior área de fixação, os macroepizóicos colonizam principalmente a carapaça do caranguejo, enquanto nos pereiópodos há predominância de Bryozoa.A study of the distribution of the macroepizoites was carried out on a population of the spider crab Libinia ferreirae Brito Capello, 1871 from the Southern Brazilian coast. Crabs were obtained from shrimps and fishes by-catch. They were measured, and their macroepizoites were identified and counted. The following sessile macroepizoites were registered: Calliactis tricolor (Lesueur, 1817 (Cnidaria; Actiniaria (Cnidaria; Arca sp. (Mollusca; Ostreidae (Mollusca; Acanthodesia tenuis (Desor, 1848 (Bryozoa; Cirripedia and two species

  9. Littoral and Coastal Management in Supporting Maritime Security for Realizing Indonesia as World Maritime Axis

    Science.gov (United States)

    Brotosusilo, Agus; Wayan Agus Apriana, I.; Agung Satria, Afrizal; Jokopitoyo, Trisasono

    2016-02-01

    The Indonesian under President Joko Widodo has new goal to make Indonesia as the world maritime axis. This is supported by the geographic of Indonesia as the largest archipelagic country where the sea is two-thirds wide among the whole spacious. Indonesia is the world largest archipelagic state. More than two-third of its territory consist of seas. The ecosystem of littoral and coastal has correlative relationship with country development. There is no doubt of physically facts that Indonesian littoral and coastal with total wide of 5.8 million km2 is rich with various natural resources. Therefore, the condition of Indonesia with its world second longest coastline has several comparative advantages. Not only the country has an abundant natural resources, but it also blessed by demographic bonus advantage. The population of Indonesian is the fifth largest in the world which approximately 220 million people and approximately 60 percent among them live at coastal areas. The people in coastal area relies their live from its surrounding natural resource. Hence, most of their life and daily activity is related with the presence of natural resources. The dealing of conflict potential and attention to maritime security are important to be studied as a reference in preparing and facing the government policies that will lead to the development of maritime.

  10. Determination of 4-nonylphenol concentrations in sediment from a littoral enclosure study

    Energy Technology Data Exchange (ETDEWEB)

    Sheedy, B.R. [Integrated Lab. Systems, Duluth, MN (United States); Heinis, L.J. [Univ. of Wisconsin, Superior, WI (United States); Knuth, M.L.; Ankley, G.T. [Environmental Protection Agency, Duluth, MN (United States). Environmental Research Lab.

    1994-12-31

    During the summer of 1993, a small pond, divided into 18 littoral enclosures was dosed for 21 days with the industrial surfactant metabolite, 4-nonylphenol (NP). A team of biologists and chemists monitored the biological and chemical parameters in each littoral enclosure during the dosing period and for several months thereafter. The water column NP concentrations (nominal 0, 3, 30, 1 00 and 300 ppb) remained relatively constant throughout the dosing period and decreased dramatically during the post-dose phase Natural sediment concentrations, determined during the post-dose phase, in most cases remained high, especially at the 300 ppb level. Artificial containers of sediment placed in several enclosures had somewhat lesser concentrations than the natural sediment. Over the six week sampling period (post-dose), the natural sediment concentrations dropped off, but were still significant at 63 days post-dose. This NP disappearance was small in comparison to the disappearance of NP from the water column. Sediment interstitial NP concentrations were not detected. Concentrations of NP in the sediment after winter will be determined and discussed.

  11. Response of littoral macrophytes to water level fluctuations in a storage reservoir

    Directory of Open Access Journals (Sweden)

    Krolová M.

    2013-05-01

    Full Text Available Lakes and reservoirs that are used for water supply and/or flow regulations have usually poorly developed littoral macrophyte communities, which impairs ecological potential in terms of the EU Water Framework Directive. The aim of our study was to reveal controlling factors for the growth of littoral macrophytes in a storage reservoir with fluctuating water level (Lipno Reservoir, Czech Republic. Macrophytes occurred in this reservoir only in the eulittoral zone i.e., the shoreline region between the highest and the lowest seasonal water levels. Three eulittoral sub-zones could be distinguished: the upper eulittoral with a stable community of perennial species with high cover, the middle eulittoral with relatively high richness of emergent and amphibious species present at low cover values, and the lower eulittoral devoid of permanent vegetation. Cover and species composition in particular sub-zones were primarily influenced by the duration and timing of flooding, followed by nutrient limitation and strongly reducing conditions in the flooded organic sediment. Our results stress the ecological importance of eulittoral zone in reservoirs with fluctuating water levels where macrophyte growth can be supported by targeted management of water level, thus helping reservoir managers in improving the ecological potential of this type of water bodies.

  12. Abundance and Activity of Methanotrophic Bacteria in Littoral and Profundal Sediments of Lake Constance (Germany) ▿

    Science.gov (United States)

    Rahalkar, M.; Deutzmann, J.; Schink, B.; Bussmann, I.

    2009-01-01

    The abundances and activities of aerobic methane-oxidizing bacteria (MOB) were compared in depth profiles of littoral and profundal sediments of Lake Constance, Germany. Abundances were determined by quantitative PCR (qPCR) targeting the pmoA gene and by fluorescence in situ hybridization (FISH), and data were compared to methane oxidation rates calculated from high-resolution concentration profiles. qPCR using type I MOB-specific pmoA primers indicated that type I MOB represented a major proportion in both sediments at all depths. FISH indicated that in both sediments, type I MOB outnumbered type II MOB at least fourfold. Results obtained with both techniques indicated that in the littoral sediment, the highest numbers of methanotrophs were found at a depth of 2 to 3 cm, corresponding to the zone of highest methane oxidation activity, although no oxygen could be detected in this zone. In the profundal sediment, highest methane oxidation activities were found at a depth of 1 to 2 cm, while MOB abundance decreased gradually with sediment depth. In both sediments, MOB were also present at high numbers in deeper sediment layers where no methane oxidation activity could be observed. PMID:18997033

  13. Abundance and activity of methanotrophic bacteria in littoral and profundal sediments of lake constance (Germany).

    Science.gov (United States)

    Rahalkar, M; Deutzmann, J; Schink, B; Bussmann, I

    2009-01-01

    The abundances and activities of aerobic methane-oxidizing bacteria (MOB) were compared in depth profiles of littoral and profundal sediments of Lake Constance, Germany. Abundances were determined by quantitative PCR (qPCR) targeting the pmoA gene and by fluorescence in situ hybridization (FISH), and data were compared to methane oxidation rates calculated from high-resolution concentration profiles. qPCR using type I MOB-specific pmoA primers indicated that type I MOB represented a major proportion in both sediments at all depths. FISH indicated that in both sediments, type I MOB outnumbered type II MOB at least fourfold. Results obtained with both techniques indicated that in the littoral sediment, the highest numbers of methanotrophs were found at a depth of 2 to 3 cm, corresponding to the zone of highest methane oxidation activity, although no oxygen could be detected in this zone. In the profundal sediment, highest methane oxidation activities were found at a depth of 1 to 2 cm, while MOB abundance decreased gradually with sediment depth. In both sediments, MOB were also present at high numbers in deeper sediment layers where no methane oxidation activity could be observed.

  14. Population dynamics of shrimps in littoral marine waters of the Mekong Delta, south of Viet Nam.

    Science.gov (United States)

    Dinh, T D; Moreau, J; Van, M V; Phuong, N T; Toan, V T

    2010-07-15

    The population dynamics of eight commercial species of shrimp (Haliporoides sibogae, Harpiosquilla harpax, Metapenaeus affinis, Metapenaeus brevicornis, Metapenaeus tenuipes, Parapenaeopsis cultrirostris, Parapenaeopsis gracillima and Parapenaeus maxilipedo) distributed in littoral marine zone of the Mekong Delta were investigated. Length-based stock assessment using FiSAT II software package was used to assess the growth and mortality parameters: Asymptotic size (L8), growth coefficient (K), total (Z) and natural (M) mortality, exploitation rate (E), recruitment pattern, current probability of capture and selectivity of fishing gears. Yield-per-recruit analyses were carried out showing different levels of the exploitation. Results showed that the maximum sustainable yield would be reached for an exploitation rate higher than the current one for each population. However, the size of first capture should be increased for every population. The findings indicated that the current exploitations of shrimp populations distributed in littoral marine zone of the Mekong Delta are under exploitation level for maximum sustainable yield; however, all the shrimp populations are subject to growth over-exploitation.

  15. Post-tsunami changes in the littoral environment along the southeast coast of India.

    Science.gov (United States)

    Jaya Kumar, S; Naik, K A; Ramanamurthy, M V; Ilangovan, D; Gowthaman, R; Jena, B K

    2008-10-01

    The 26th December 2004 Indian Ocean tsunami devastated coastal regions of the Indian subcontinent. Andaman and Nicobar Islands, coastal stretches of Tamil Nadu, Andhra Pradesh and Kerala were the most affected regions of India. Changes in the beach profiles, long shore currents, breaking wave characteristics in the surf zone at selected locations along the Tamil Nadu coast were studied during January, April, October 2005 and January 2006. Long shore sediment transport rates were estimated from the observed parameters. Studies were carried out earlier (1995-1996 and 1998) to understand the coastal environment over a one-year cycle in the study region. The post-tsunami observations were compared with the earlier studies to establish the variations in the littoral environment and to ascertain the normalcy of the littoral environment in the post-tsunami scenario. From the changes in the beach profiles, the shoreline was observed to recede by about 20 m and built-up of backshore by about 0.5 m at most locations. Observations from the field investigations and comparisons with earlier studies along this stretch of the coastline indicate that the coastline is yet to return completely to normalcy.

  16. Use and occupation of Olinda littoral (NE, Brazil): guidelines for an integrated coastal management.

    Science.gov (United States)

    Pereira, Luci Cajueiro Carneiro; Jiménez, José A; Medeiros, Carmen; da Costa, Rauquírio Marinho

    2007-08-01

    Located on the northeast Brazilian coast, Olinda is one of UNESCO's World Heritage Sites, which is economically dependent on tourism, commerce, industry, and the informal economy. Despite its environmental and socioeconomic importance, the city of Olinda (understanding the coast as part of it) has suffered several environmental and human disturbances over the last decades. This work describes the environmental and social status of Olinda's beaches and makes recommendations concerning the development of an Integrated Coastal Management Plan for this coastal zone of the Brazilian littoral. The methodology adopted in this study is based on field campaigns (social, physical, chemical, and biological data collection), local observations, and the collection of sea contention building project data from city hall. The results showed that along the seven studied beaches, the main problems were related to the: (i) building of coastal protections, (ii) inefficient sewage disposal systems, (iii) inefficient urban management, and (iv) natural events (equinoctial spring tides and precipitation/evaporation rates). Casa Caiada beach showed the best hydrologic conditions as a consequence of its morphology and it presents facilities that attract housing and recreation investments (by private and public sectors) valuing and improving local use conditions. The obtained data showed that the studied beaches need an urgent action plan to minimize the environmental degradation of Olinda's littoral and to promote sustainable development of the local coastal environments.

  17. Methyl mercury dynamics in littoral sediments of a temperate seepage lake

    Science.gov (United States)

    Krabbenhoft, D.P.; Gilmour, C.C.; Benoit, J.M.; Babiarz, C.L.; Andren, A.W.; Hurley, J.P.

    1998-01-01

    The sites and rates of methyl mercury (MeHg) production and transport in littoral zone sediments were investigated at Pallette Lake in northern Wisconsin. In littoral areas where groundwater inflow occurs, sulfate supply from groundwater creates profiles of electron acceptors (sulfate) and donors (methane, sulfide) that are reversed from those found in sediments whose sulfate supply is delivered from overlying water. The highest MeHg concentrations in porewaters and the maximal advective MeHg flux rates (4.5-61.7 ng??m-2??day-1) were observed in the spring, while highest bulk phase concentrations occur later in the summer. These estimated MeHg fluxes are greater than the mean areal production rates estimated previously for the water column and are similar to the atmospheric flux. Gross MeHg production was measured using the addition of 203Hg as a tracer to sediments. The depth at which maximal 203Hg methylation occurred coincided with the observed maximums m solid-phase and porewater MeHg concentrations. Because input, advection, and accumulation of MeHg in these sediments were measured directly, an independent estimate of MeHg production could be made and compared with 203Hg-derived rates. This comparison suggests that the 203Hg tracer method provides reasonable estimates of gross methylation rates and that a substantial fraction of solid-phase Hg is available for methylation.

  18. Hydrology is reflected in the functioning and community composition of methanotrophs in the littoral wetland of a boreal lake.

    Science.gov (United States)

    Siljanen, Henri M P; Saari, Anne; Krause, Sascha; Lensu, Anssi; Abell, Guy C J; Bodrossy, Levente; Bodelier, Paul L E; Martikainen, Pertti J

    2011-03-01

    In lake ecosystems a major proportion of methane (CH(4) ) emissions originate from the littoral zone, which can have a great spatial variability in hydrology, soil quality and vegetation. Hitherto, spatial heterogeneity and the effects it has on functioning and diversity of methanotrophs in littoral wetlands have been poorly understood. A diagnostic microarray based on the particulate methane monooxygenase gene coupled with geostatistics was used to analyse spatial patterns of methanotrophs in the littoral wetland of a eutrophic boreal lake (Lake Kevätön, Eastern Finland). The wetland had a hydrology gradient with a mean water table varying from -8 to -25 cm. The wettest area, comprising the highest CH(4) oxidation, had the highest abundance and species richness of methanotrophs. A high water table favoured the occurrence of type Ib methanotrophs, whereas types Ia and II were found under all moisture conditions. Thus the spatial heterogeneity in functioning and diversity of methanotrophs in littoral wetlands is highly dependent on the water table, which in turn varies spatially in relation to the geomorphology of the wetland. We suggest that changes in water levels resulting from regulation of lakes and/or global change will affect the abundance, activity and diversity of methanotrophs, and consequently CH(4) emissions from such systems. © 2010 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.

  19. Seasonal and spatial variations in heterotrophic nanoflagellate and bacteria abundances in sediments of a freshwater littoral zone

    NARCIS (Netherlands)

    Starink, Mathieu; Bär-Gilissen, M.J.; Cappenberg, T.E.

    1996-01-01

    We studied seasonal variation in heterotrophic nanoflagellates (HNAN) and bacterial, densities at different depths in the sediment of two freshwater littoral stations. Station 1 was in a reed bed of Phragmites australis; station 2 was outside the reed zone in open water. Benthic HNAN abundances

  20. A new look at the Flood Pulse Concept : The (ir)relevance of the moving littoral in temperate zone rivers

    NARCIS (Netherlands)

    Keizer, F. M.; Schot, P. P.; Okruszko, T.; Chormański, J.; Kardel, I.; Wassen, M. J.

    2014-01-01

    The Flood Pulse Concept links the hydraulic river flood pulse to floodplain nutrient status. The edge of inundation, referred to as the moving littoral, causes wetting and drying and input of river derived nutrients, resulting in high floodplain productivity. If during the floods other water sources

  1. [Some adaptations of Monodonta turbinata (born, 1780) (Gastropoda, Prosobranchia, Trochidae) to feeding and habitation in the littoral zone].

    Science.gov (United States)

    Aliakrinskaia, I O

    2010-01-01

    The basic morphological, ethological, and physiological-biochemical adaptations of Monodonta turbinata to survival in the littoral zone were investigated in this work. Quantitative estimation of myoglobin content in radular tissues of mollusks inhabiting the Mediterranean Sea Basin has been carried out.

  2. Chemical, Physical, and Biological Factors Shape Littoral Invertebrate Community Structure in Coal-Mining End-Pit Lakes

    Science.gov (United States)

    Luek, Andreas; Rasmussen, Joseph B.

    2017-04-01

    Aquatic invertebrates form the base of the consumer food web in lakes. In coal-mining end-pit lakes, invertebrates are exposed to an environment with potentially challenging physical and chemical features. We hypothesized that the physical and chemical features of end-pit lakes reduce critical littoral habitat and thus reduce invertebrate diversity, thereby limiting the potential for these lakes to be naturalized. We used a multivariate approach using principle component analysis and redundancy analysis to study relationships between invertebrate community structure, habitat features, and water quality in five end-pit lakes and five natural lakes in the Rocky Mountain foothills of west-central Alberta, Canada. Results show a significantly different invertebrate community structure was present in end-pit lakes as compared with reference lakes in the same region, which could be accounted for by water hardness, conductivity, slope of the littoral zone, and phosphorus concentrations. Habitat diversity in end-pit lakes was also limited, cover provided by macrophytes was scarce, and basin slopes were significantly steeper in pit lakes. Although water chemistry is currently the strongest influencing factor on the invertebrate community, physical challenges of habitat homogeneity and steep slopes in the littoral zones were identified as major drivers of invertebrate community structure. The addition of floating wetlands to the littoral zone of existing pit lakes can add habitat complexity without the need for large-scale alterations to basing morphology, while impermeable capping of waste-rock and the inclusion of littoral habitat in the planning process of new pit lakes can improve the success of integrating new pit lakes into the landscape.

  3. The littoral zone in the Three Gorges Reservoir, China: challenges and opportunities.

    Science.gov (United States)

    Yuan, Xing-zhong; Zhang, Yue-wei; Liu, Hong; Xiong, Sen; Li, Bo; Deng, Wei

    2013-10-01

    For flood control purpose, the water level of the Three Gorges Reservoir (TGR) varies significantly. The annual reservoir surface elevation amplitude is about 30 m behind the dam. Filling of the reservoir has created about 349 km(2) of newly flooded riparian zone. The average flooding period lasts for more than 6 months, from mid-October to late April. The dam and its associated reservoir provide flood control, power generation, and navigation, but there are also many environmental challenges. The littoral zone is the important part of the TGR, once its eco-health and stability are damaged,which will directly endanger the ecological safety of the whole reservoir area and even the Yangtze River Basin. So, understanding the great ecological opportunities which are hidden in littoral zone of TGR (LZTGR) and putting forward approaches to solve the environmental problems are very important. LZTGR involves a wide field of problems, such as the landslides, potential water pollution, soil erosion, biodiversity loss, land cover changes, and other issues. The Three Gorges dam (TGD) is a major trigger of environmental change in the Yangtze River. The landslides, water quality, soil erosion, loss of biodiversity, dam operation, and challenge for land use are closely interrelated across spatial and temporal scales. Therefore, the ecological and environmental impacts caused by TGD are necessarily complex and uncertain. LZTGR is not only a great environmental challenge but also an ecological opportunity for us. In fact, LZTGR is an important structural unit of TGR ecosystem and has special ecosystem services function. Vegetation growing in LZTGR is therefore a valuable resource due to accumulation of carbon and nutrients. Everyone thinks that the ecological approach to the problem is needed. If properly designed, dike-pond systems, littoral woods systems, and re-created waterfowl habitats will have the capacity to capture nutrients from uplands and obstruct soil erosion

  4. Comparison of fish assemblages in two littoral habitats in a Neotropical morichal stream in Venezuela

    Directory of Open Access Journals (Sweden)

    Carmen G. Montaña

    Full Text Available Morichales are lowland streams in South American savannas with riparian forest dominated by the moriche palm (Mauritia flexuosa. We sampled littoral habitats from ten flooded vegetated patches (dominated by Mauritiella aculeate and six sand banks in two months of the dry season (Feb-Mar 2005 in a stream in the savannas of Apure State, Venezuela. We collected samples that compromised 12,407 individual fishes of 107 species. Small-bodied fishes (< 100 mm, representing diverse trophic and life history strategies, were abundant. The most abundant species were in the families Characidae and Cichlidae. Fish assemblages from flooded vegetated patches differed significantly from those on adjacent sand banks. High structural complexity along vegetated shoreline habitats of morichal streams likely contributes to species richness and affects assemblage composition.

  5. Littoral zones as sources of biodegradable dissolved organic carbon in lakes

    Science.gov (United States)

    Stets, E.G.; Cotner, J.B.

    2008-01-01

    A survey of 12 lakes in Minnesota, USA, was conducted to examine the factors controlling variability in biodegradable dissolved organic carbon (BDOC) concentration. The principal question addressed was whether BDOC concentration was more strongly related to lake trophic status or morphometric parameters. BDOC concentration was determined by incubating filtered lake water for a period of 15 months and fitting an exponential decay curve to measured DOC concentrations. BDOC concentrations varied from 73 to 427 mmol C.L-1 and composed 15%-63% of the total DOC pool. There were no significant correlations between BDOC and measures of lake trophic status. Instead, BDOC was most closely associated with the percentage of lake area covered by littoral zone, suggesting a significant source of BDOC from aquatic macrophytes and lake surface sediments. ?? 2008 NRC.

  6. Effect of metals on Daphnia magna and cladocerans representatives of the Argentinean fluvial littoral.

    Science.gov (United States)

    Luciana, Regaldo; Reno, Ulises; Gervasio, Susana; Horacio, Troiani; Gagneten, Ana María

    2014-07-01

    Chronic toxicity tests were conducted to assess the effect of Cu, Cr and Pb on Moinodaphnia macleayi and Ceriodaphnia dubia -two cladoceran species from the Argentinian Fluvial Littoral Zone (AFLZ)- and Daphnia magna -an holarctic species-. The specimens were exposed to three concentrations of each metal. As endpoints, the number of living and dead organisms, molts, neonates released, and the age of first reproduction were recorded. Chronic assays showed that Cu significantly affected the analyzed life history traits in the three species. The lowest Pb and Cr concentrations did not affect survival, molting or fecundity in D. magna. Conversely, in M. macleayi and C. dubia, survival, molting and fecundity showed highly significant differences in all the concentrations tested compared to control assay. The present study stresses the importance of using biological parameters as bioindicators, as well as the study species from the Southern Hemisphere to assess metal pollution.

  7. Better Few than Hungry: Flexible Feeding Ecology of Collared Lemurs Eulemur collaris in Littoral Forest Fragments

    Science.gov (United States)

    Donati, Giuseppe; Kesch, Kristina; Ndremifidy, Kelard; Schmidt, Stacey L.; Ramanamanjato, Jean-Baptiste; Borgognini-Tarli, Silvana M.; Ganzhorn, Joerg U.

    2011-01-01

    Background Frugivorous primates are known to encounter many problems to cope with habitat degradation, due to the fluctuating spatial and temporal distribution of their food resources. Since lemur communities evolved strategies to deal with periods of food scarcity, these primates are expected to be naturally adapted to fluctuating ecological conditions and to tolerate a certain degree of habitat changes. However, behavioral and ecological strategies adopted by frugivorous lemurs to survive in secondary habitats have been little investigated. Here, we compared the behavioral ecology of collared lemurs (Eulemur collaris) in a degraded fragment of littoral forest of south-east Madagascar, Mandena, with that of their conspecifics in a more intact habitat, Sainte Luce. Methodology/Principal Findings Lemur groups in Mandena and in Sainte Luce were censused in 2004/2007 and in 2000, respectively. Data were collected via instantaneous sampling on five lemur groups totaling 1,698 observation hours. The Shannon index was used to determine dietary diversity and nutritional analyses were conducted to assess food quality. All feeding trees were identified and measured, and ranging areas determined via the minimum convex polygon. In the degraded area lemurs were able to modify several aspects of their feeding strategies by decreasing group size and by increasing feeding time, ranging areas, and number of feeding trees. The above strategies were apparently able to counteract a clear reduction in both food quality and size of feeding trees. Conclusions/Significance Our findings indicate that collared lemurs in littoral forest fragments modified their behavior to cope with the pressures of fluctuating resource availability. The observed flexibility is likely to be an adaptation to Malagasy rainforests, which are known to undergo periods of fruit scarcity and low productivity. These results should be carefully considered when relocating lemurs or when selecting suitable areas for

  8. A field proof-of-concept of tomographic slug tests in an anisotropic littoral aquifer

    Science.gov (United States)

    Paradis, Daniel; Gloaguen, Erwan; Lefebvre, René; Giroux, Bernard

    2016-05-01

    Hydraulic tomography is increasingly recognized as a characterization approach that can image pathways or barriers to flow as well as their connectivity. In this study, we assess the performance of a transient analysis of tomographic slug test head data in estimating heterogeneity in horizontal hydraulic conductivity (Kh), hydraulic conductivity anisotropy (the ratio between vertical and horizontal hydraulic conductivity - Kv/Kh) and specific storage (Ss) under actual field conditions. The tomographic experiment was carried out between two wells in a moderately heterogeneous and highly anisotropic silt and sand littoral aquifer. In this field proof-of-concept, the inversion of the two-dimensional (2D) head dataset was computed with a 2D radial flow algorithm that considers Kh, Kv/Kh, Ss and wellbore storage effects. This study demonstrated that a transient analysis of tomographic slug tests is able to capture the key features of the littoral environment of the test: the vertical profiles of Kh and Kv are indeed in agreement with those from other field and laboratory tests, and Ss values exhibit physically plausible profiles. Furthermore, the simulation of independent inter-well hydraulic tests (slug and pumping tests screened over the entire aquifer) using resolved Kh, Kv/Kh and Ss tomograms produce responses very close to field observations. This study demonstrates that the effects of fine scale heterogeneity that induces K-anisotropy at larger scales can be captured through a transient analysis of tomographic slug tests, which are very difficult to quantify otherwise with conventional hydraulic tests, thus allowing a better representation of properties controlling flow and transport in aquifer systems.

  9. Abrasion and algal fouling of coarse material on the Murman littoral

    Directory of Open Access Journals (Sweden)

    Malavenda S. V.

    2017-03-01

    Full Text Available On the Murmansk coast of the Barents Sea the boulder littoral zone is widely spread mostly covered by Fucus communities. This is one of the most productive benthic communities of the Barents Sea. The studies of intertidal communities have the long history, but the dynamics of intertidal ecosystems due to surf and storms is not clear. The goal of the work is to identify the leading factors that determine the rate of abrasion of coarse material and fouling algae-macrophytes of the intertidal zone of Murman. The study has been conducted in the Zelenetskaya Bay of the Barents Sea on the basis of the biological station of the MMBI KSC RAS. The rate of abrasion has been carried out during 2004–2013, phyto-overgrowing – 2009–2013. In three pilot landfills 12 samples of coarse material have been exposed during the year (from July to next July. The weight change of the sample as well as species composition and biomass of algae of fouling communities have been investigated. The influence of the surf intensity, temperature of water and air has been analyzed (univariate analysis of variance ANOVA has been applied. It has been shown that on the littoral of the Murmansk coast the abrasion of coarse material is determined primarily by the number of storms, so the storm rate has been proposed. It has been revealed that the density of fouling boulders with macroalgae depends primarily on the intensity of the surf and the average gradient of air temperature. The basis for the emerging communities of annual species are green (Acrosiphonia arcta, Blidingia minima, Spongomorpha aeruginosa and brown algae (Pylaiella littoralis, Dictyosiphon chordaria. These algae groups are found everywhere in Fucus communities of the boulder intertidal zone of the Murman coast and probably they are the intermediate stage of fouling the coarse-grained material

  10. N2O fluxes from the littoral zone of a Chinese reservoir

    Science.gov (United States)

    Yang, M.; Geng, X. M.; Grace, J.; Jia, Y. F.; Liu, Y. Z.; Jiao, S. W.; Shi, L. L.; Lu, C.; Zhou, Y.; Lei, G. C.

    2015-08-01

    There have been few studies of greenhouse gas emissions from reservoirs, despite the remarkable growth in the number of reservoirs in developing countries. We report a case study that focuses on the littoral zone of a major Chinese reservoir, where we established measurements of N2O fluxes using the static chamber technique at five different water levels (deep water, shallow water, seasonally flooded, control for seasonally flooded, and non-flooded). The "control for seasonal flooded" had similar vegetation to the "seasonally flooded" but was not actually flooded as it was on a higher piece of land. Seasonal, diurnal and spatial variations of N2O flux and environmental factors were monitored throughout the growing season which included a flood event during summer rains. The N2O flux ranged from -136.6 to 381.8 μg m-2 h-1 averaging 6.8 μg m-2 h-1. Seasonal and spatial variation was significant but diurnal variation was not. Non-flooded dry land emitted more N2O than flooded land, no matter whether it was permanently or seasonally flooded. Piecewise correlation was found between N2O flux, air temperature and soil nitrate concentration. Positive correlation was shown between N2O flux and dissolved oxygen in water. There were significantly higher emissions from farmland. We compared these results with our recently published study of CH4 emissions, carried out simultaneously at the same site as those in the present study. Completely different patterns between the two gases are demonstrated. We conclude that the littoral zone is a hotspot for N2O emissions in the summer, especially when the shores of the lake are used for the farming of maize. But in terms of the overall greenhouse gas budget, the fluxes of N2O are not as important as those of CH4.

  11. Predictability of littoral-zone fish communities through ontogeny in Lake Texoma, Oklahoma-Texas, USA

    Science.gov (United States)

    Eggleton, M.A.; Ramirez, R.; Hargrave, C.W.; Gido, K.B.; Masoner, J.R.; Schnell, G.D.; Matthews, W.J.

    2005-01-01

    We sampled larval, juvenile and adult fishes from littoral-zone areas of a large reservoir (Lake Texoma, Oklahoma-Texas) (1) to characterize environmental factors that influenced fish community structure, (2) to examine how consistent fish-environment relationships were through ontogeny (i.e., larval vs. juvenile and adult), and (3) to measure the concordance of larval communities sampled during spring to juvenile and adult communities sampled at the same sites later in the year. Larval, juvenile and adult fish communities were dominated by Atherinidae (mainly inland silverside, Menidia beryllina) and Moronidae (mainly juvenile striped bass, Morone saxatilis) and were consistently structured along a gradient of site exposure to prevailing winds and waves. Larval, juvenile and adult communities along this gradient varied from atherinids and moronids at highly exposed sites to mostly centrarchids (primarily Lepomis and Micropterus spp.) at protected sites. Secondarily, zooplankton densities, water clarity, and land-use characteristics were related to fish community structure. Rank correlation analyses and Mantel tests indicated that the spatial consistency and predictability of fish communities was high as larval fishes sampled during spring were concordant with juvenile and adult fishes sampled at the same sites during summer and fall in terms of abundance, richness, and community structure. We propose that the high predictability and spatial consistency of littoral-zone fishes in Lake Texoma was a function of relatively simple communities (dominated by 1-2 species) that were structured by factors, such as site exposure to winds and waves, that varied little through time. ?? Springer 2005.

  12. Guide to the littoral zone vascular flora of Carolina bay lakes (U.S.A.).

    Science.gov (United States)

    Howell, Nathan; Krings, Alexander; Braham, Richard R

    2016-01-01

    Carolina bays are elliptic, directionally aligned basins of disputed origin that occur on the Atlantic Coastal Plain from the Delmarva Peninsula to southern Georgia. In southeastern North Carolina, several large, natural, lacustrine systems (i.e., Carolina bay lakes) exist within the geomorphological features known as Carolina bays. Within the current distribution of Carolina bays, Bladen and Columbus counties (North Carolina) contain the only known examples of Carolina bay lakes. The Carolina bay lakes can be split into two major divisions, the "Bladen Lakes Group" which is characterized as being relatively unproductive (dystrophic - oligotrophic), and Lake Waccamaw, which stands alone in Columbus County and is known for its high productivity and species richness. Although there have been several studies conducted on these unique lentic systems, none have documented the flora comprehensively. Over the 2013-2014 growing seasons, the littoral zone flora of Carolina bay lakes was surveyed and vouchered. Literature reviews and herbarium crawls complemented this fieldwork to produce an inventory of the vascular plant species. This survey detected 205 taxa (species/subspecies and varieties) in 136 genera and 80 vascular plant families. Thirty-one species (15.2%) are of conservation concern. Lake Waccamaw exhibited the highest species richness with 145 catalogued taxa and 26 species of conservation concern. Across all sites, the Cyperaceae (25 spp.), Poaceae (21 spp.), Asteraceae (13 spp.), Ericaceae (8 spp.), Juncaceae (8 spp.), and Lentibulariaceae (6 spp.) were the six most species-rich vascular plant families encountered. A guide to the littoral zone flora of Carolina bay lakes is presented herein, including dichotomous keys, species accounts (including abundance, habitat, phenology, and exsiccatae), as well as images of living species and vouchered specimens.

  13. Temporal trends of littoral fishes at deep Posidonia oceanica seagrass meadows in a temperate coastal zone

    Science.gov (United States)

    Deudero, Salud; Morey, Gabriel; Frau, Antoni; Moranta, Joan; Moreno, Isabel

    Seasonal abundance and biomass of littoral fish at Posidonia oceanica seagrass meadows were characterized throughout an annual cycle in Mediterranean waters. Bimonthly beam trawl hauls were performed between 18 and 38 m depth at 4 sites sampling from 2 locations. Approximately 8230 littoral fish were collected belonging to 25 families and 51 species with Labridae and Sparidae families being predominant in terms of abundance. Mean fish abundance was 92 ± 7.5 individuals · 1000 m - 2 peaking in March, April and September and total abundance showed significant statistical differences between May and October. Densities of Diplodus annularis, Gobius sp., Mullus surmuletus, Parablennius tentacularis, Sarpa salpa, Sciaena umbra, Scorpaena porcus, Serranus cabrilla, Symphodus ocellatus, Symphodus rostratus, Symphodus tinca and Synodus saurus differed significantly between seasons. Total community biomass varied significantly along the year with maximum values observed in July (1500 g · 1000 m - 2 ) and minimum biomass recorded in October. The number of species ranged between 5 in January and 21 in July while the total number of individuals was 293 in July and 21 in September, and Margalef diversity index differed between 4.11 in July and 1.3 in January. Biomass peaked in summer linked mainly to the increase of S. porcus, Serranus scriba and some Symphodus species. Diversity was maximal in July and the larger mean size for most of the fish species was achieved from May to July corresponding to the recruitment peaks of some of the fish species. The SIMPER analysis showed that there are seasonal differences in the trophic roles of the fish communities at seagrass meadows. The temporal patterns observed highlight the multifunctional role of deep seagrass meadows during the summer months when all the measured parameters are maximal. Those observations point out the need for conservation measures to be intensified in the warm season.

  14. Typtonomenaeusformosanus gen. et sp. nov., a new sponge-associated pontoniine shrimp (Crustacea: Decapoda: Palaemonidae: Pontoniinae) from northern Taiwan.

    Science.gov (United States)

    Marin, Ivan; Chan, Tin-Yam

    2013-01-01

    A new genus and species of sponge-associated pontoniine shrimps (Crustacea: Decapoda: Palaemonidae: Pontoniinae) is described from northern part of Formosa Island (Taiwan). The new species can be clearly recognized by convex robust nail-like apices on dactyli of both pereiopods II--a unique morphological structure among pontoniine shrimps. Morphological differences from all known sponge-associated pontoniine genera are discussed.

  15. A new species of Hemicyclops (Crustacea, Copepoda, Poecilostomatoida, Clausidiidae) associated with hermit crabs in Curaçao

    NARCIS (Netherlands)

    Stock, Jan H.

    1992-01-01

    STOCK, J. H. 1992. A new species of Hemicyclops (Crustacea, Copepoda, Poecilostomatoida, Clausidiidae) associated with hermit crabs in Curaçao. Stud. Nat. Hist. Caribbean Region 71, Amsterdam 1992: 69-78. Hemicyclops geminatus n. sp. is described from the upper infralittoral zone of Curaçao (Antille

  16. On a collection of Decapod and Stomatopod Crustacea from Pulau Berhala, an islet situated in the straits of Malacca

    NARCIS (Netherlands)

    Man, de J.G.

    1929-01-01

    Mr. J. C. VAN DER MEER MOHR, Zoologist at the Deli-Station at Medan (Sumatra), has in 1926 and in August and December 1927 collected at Pulau Berhala 37 species and one variety of Decapod Crustacea and a variety of Gonodactylus chiragra (Fabr.); these species are described in this paper. As far as I

  17. Northern Gulf Littoral Initiative (NGLI), Geology and Physical Properties of Marine Sediments in the N.E. Gulf of Mexico: Data Report

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Northern Gulf Littoral Initiative (NGLI), Geology and Physical Properties of Marine Sediments in the N.E. gulf of Mexico: Data Report, was produced by the U.S....

  18. [The biogeochemical cycle of methane in the coastal zone and littoral of the Kandalaksha Bay of the White Sea].

    Science.gov (United States)

    Savvichev, A S; Rusanov, I I; Iusupov, S K; Pimenov, N V; Lein, A Iu; Ivanov, M V

    2004-01-01

    Microbiological and biogeochemical investigations of the processes of methane production (MP) and methane oxidation (MO) in the coastal waters and littoral of the Kandalaksha Bay of the White Sea were carried out. The studies were conducted in the coastal zones and in the water areas of the Kandalaksha Preserve, Moscow University White Sea Biological Station, and Zoological Institute (RAS) Biological Station in August, 1999, 2000, and 2001 and in March, 2001. The rate of CO2 assimilation in the shallow and littoral sediments was 35-27800 microg C/(dm3 day) in summer and 32.8-88.9 microg C/(dm3 day) in winter. The maximal rates of MP were observed in the littoral sediments in the zone of macrophyte decomposition, in local depressions, and in the estuary of a freshwater creak (up to 113 microl/(dm3 day)). The maximal level of MO was observed in the shallow estuarine sediments (up to 2450 microl/(dm3 day)). During the winter season, at the temperature of -0.5 to 0.5 degrees C, the MP rate in the littoral sediments was 0.02-0.3 microl/(dm3 day), while MO rate was 0.06-0.7 microl/(dm3 day). The isotopic data obtained indicate that the C(org) of the mats and of the upper sediment layers is enriched with the heavy 13C isotope by 1-4 per thousand as compared to the C(org) of the suspension, comprised on 33.5-34.3% of phytoplankton. A striking difference was found between the levels of methane emission by the typical littoral microlanscapes. In fine sediments, the average emission was 675 microl CH4/(m2 day), in the stormy discharge stretch sediments it was 1670 microl CH4/(m2 day), and under the stones and in silted pits, 1370 microl CH4/(m2 day). The calculation performed with consideration of the microlandscape areas with a high production allowed the CH4 production of 1 km2 of the littoral to be estimated as 192-300 1 CH4/(km2 day).

  19. Endemism in the Cladocera (Crustacea: Branchiopoda of Southern Africa

    Directory of Open Access Journals (Sweden)

    Kay Van Damme

    2013-08-01

    Full Text Available We review the current state of knowledge and patterns of distribution in the endemic Cladocera (Crustacea: Branchiopoda of Southern Africa and describe two species of the Western Cape, of which one is new to science. Frey (1993, Korovchinsky (2006 and Smirnov (2008 previously suggested that South Africa harbours few endemics in the Cladocera. In the current study, we show that so-called low endemism in this region is mainly attributed to our limited state of knowledge of the local cladoceran fauna. Many of the South African taxa are ignored and revisions are lacking, as we briefly discuss for the genus Daphnia. We list known Southern African endemic Cladocera with notes on their status, map the distributions of well-studied taxa, and discuss the importance of temporary freshwater rockpools. We confirm that Southern Africa is a region of endemism for the group. We recognise three categories of endemics: i Montane endemics in the East (e.g. Drakensberg mountains; ii endemics of the Western Cape (lowlands; iii South African endemics, widely distributed in the region, both in the mountains and the lowlands. South African endemics have previously been regarded as relicts (Korovchinsky 2006, yet for the two taxa explored in detail in this study, there are no specific primitive morphological characters in comparison to congeners (within their respective genus/species group and the morphology mainly suggests strong isolation. The two species belong to the Chydoridae and the Eurycercidae, respectively, and are used here as case studies for the investigation of Western Cape endemics. The first, Alona capensis Rühe, 1914 (Anomopoda: Chydoridae: Aloninae, is redescribed based on the type material. We discuss the affinities of this enigmatic species for the first time. Morphology of the habitus and the postabdomen parallel that of members of the Alona affinis-complex. The disconnected head pores and limb characters, on the other hand, place A. capensis in

  20. Invasive mussels alter the littoral food web of a large lake: stable isotopes reveal drastic shifts in sources and flow of energy.

    Directory of Open Access Journals (Sweden)

    Ted Ozersky

    Full Text Available We investigated how establishment of invasive dreissenid mussels impacted the structure and energy sources of the littoral benthic food web of a large temperate lake. We combined information about pre- and postdreissenid abundance, biomass, and secondary production of the littoral benthos with results of carbon and nitrogen stable isotope analysis of archival (predreissenid and recent (postdreissenid samples of all common benthic taxa. This approach enabled us to determine the importance of benthic and sestonic carbon to the littoral food web before, and more than a decade after dreissenid establishment. Long term dreissenid presence was associated with a 32-fold increase in abundance, 6-fold increase in biomass, and 14-fold increase in secondary production of the littoral benthos. Dreissenids comprised a large portion of the post-invasion benthos, making up 13, 38, and 56% of total abundance, biomass, and secondary production, respectively. The predreissenid food web was supported primarily by benthic primary production, while sestonic material was relatively more important to the postdreissenid food web. The absolute importance of both sestonic material and benthic primary production to the littoral benthos increased considerably following dreissenid establishment. Our results show drastic alterations to food web structure and suggest that dreissenid mussels redirect energy and material from the water column to the littoral benthos both through biodeposition of sestonic material as well as stimulation of benthic primary production.

  1. OCORRÊNCIA DE Macrobrachium amazonicum (CRUSTACEA, DECAPODA) NA DIETA DE Lysapsus bolivianus (ANURA, HYLIDAE).

    OpenAIRE

    Mayara Fabiana Melo Furtado; Carlos Eduardo Costa-Campos; Suelique de Souza Queiroz; Kelly Juliana Gaya Correa; Inacia Maria Vieira

    2013-01-01

    A dieta de Lysapsus bolivianus está baseada principalmente em pequenos artrópodes, representados geralmente por Diptera, Collembola e Hemiptera, sendo os crustáceos encontrados ocasionalmente. No presente trabalho registramos a presença de Macrobrachium amazonicum na dieta de L. bolivianus em planície de Inundação no Norte do Brasil. Palavras-chave: dieta, Crustacea, Amazônia Oriental. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v3n3p185-187

  2. Organization of the mitochondrial genome of mantis shrimp Pseudosquilla ciliata (Crustacea: Stomatopoda).

    Science.gov (United States)

    Podsiadlowski, Lars; Bartolomaeus, Thomas

    2005-01-01

    We determined the nearly complete mitochondrial genome of Pseudosquilla ciliata (Crustacea, Stomatopoda), including all protein-coding genes and all but one of the transfer RNAs. There were no gene rearrangements relative to the pattern shared by crustaceans and hexapods. Phylogenetic analysis using concatenated amino acid sequences of the mitochondrial protein-coding genes confirmed a basal position of Stomatopoda among Eumalacostraca. Pancrustacean relationships based on mitogenomic data were analyzed and are discussed in relation to crustacean and hexapod monophyly and hexapod affinities to crustacean subtaxa.

  3. Ephemeroporus quasimodo sp. nov. (Crustacea: Cladocera: Chydoridae), a new species from the Brazilian Cerrado.

    Science.gov (United States)

    Elmoor-Loureiro, Lourdes M A

    2014-06-19

    A new species of Chydoridae cladoceran (Crustacea: Cladocera: Chydoridae) is described from the Cerrado (a Brazilian tropical savanna ecoregion), Central Brazil. Ephemeroporus quasimodo sp. nov. differs from other species of the genus in a high dorsal keel on carapace and posterior part of the head shield, which resembles a hunchback. Parthenogenetic females, ephippial females and males are described, including details of trunk limb morphology. The species is endemic to shallow wetlands found in the Cerrado, where pristine conditions are preserved. Some questions on genus morphology and taxonomic status of Ephemeroporus species occurring in Brazil are discussed.

  4. [A new species of amphipod crustacean of the genus Amphilochus (Crustacea, Amphipoda, Amphilochidae) from Venezuela].

    Science.gov (United States)

    Martín, A; Ortiz, M; Atienza, D

    2001-01-01

    A new species of amphipod Crustacea (Gammaridea, Amphilochidae) of the genus Amphilochus Bate, 1862, is described. The species was collected in Phallusia nigra (Savigny, 1816) at depths between 0 and 2 m, in the pier piles of the Marina El Ancla and Los Manglares gas station in Morrocoy National Park (Falcón State, Venezuela), during the months of June and July 1998. The main differences between A. ascidicola new species and all others species of the genus recorded from the Gulf of Mexico and the Caribbean Sea, are given.

  5. First Record of Hippa adactyla (Fabricius, 1787; Crustacea, Anomura, Hippidae) from Indonesian Waters.

    Science.gov (United States)

    Ardika, Puji Utari; Farajallah, Achmad; Wardiatno, Yusli

    2015-12-01

    Specimens of Hippa adactyla (Crustacea, Anomura, Hippidae) were collected from several coasts of Indonesia (Sumatera, Java, Bali-Lombok and Sulawesi). This finding represents the first record of this species in Indonesia and confirms its presence in the Indian Ocean and in the Wallacea region. Its systematic and morphological characteristics are described, and its distribution in Indonesia is presented. One of the main characteristics of this species is a median lobe in the anterior part of the carapace, which has 3-4 lobes. Likewise, the left antenna has 2-6 articles.

  6. Mercury concentrations in dusky grouper Epinephelus marginatus in littoral and neritic habitats along the Southern Brazilian coast.

    Science.gov (United States)

    Condini, Mario V; Hoeinghaus, David J; Roberts, Aaron P; Soulen, Brianne K; Garcia, Alexandre M

    2017-02-15

    Our study incorporated a comprehensive suite of parameters (i.e., body size, age, diet and trophic position) to investigate mercury concentration in dusky groupers Epinephelus marginatus. This study was carried out in rocky bottoms in littoral and neritic habitats along the Southern Brazilian coast. We also determined spatial variation in mercury concentrations in individuals inhabiting both zones, which may provide insights into how dietary differences or potential pollution sources affect bioaccumulation. A total of 244 dusky groupers was analyzed to determine total mercury concentrations. Our study revealed that when considering similar body sizes, individuals inhabiting littoral rocky habitats had higher concentrations of mercury probably due to proximity to pollution sources associated with human activities in the estuary and its drainage basin. Furthermore, large individuals (>650mm and >8years old) showed mercury contamination levels that are potentially harmful for this endangered fish species and above the acceptable limits for human consumption.

  7. The influence of productivity and width of littoral zone on the trophic position of a large-bodied omnivore.

    Science.gov (United States)

    Stenroth, Patrik; Holmqvist, Niklas; Nyström, Per; Berglund, Olof; Larsson, Per; Granéli, Wilhelm

    2008-06-01

    Omnivory is common in many food webs. Omnivores in different habitats can potentially change their feeding behaviour and alter their trophic position and role according to habitat conditions. Here we examine the trophic level and diet of the omnivorous signal crayfish (Pacifastacus leniusculus) in gradients of trophic status and lake size, both of which have been previously suggested to affect trophic position of predators separately or combined as productive space. We found the trophic position of omnivorous crayfish to be positively correlated with lake trophic status, but found no evidence for any influence of lake size or productive space on crayfish trophic position. The higher trophic position of crayfish in eutrophic lakes was largely caused by a shift in crayfish diet and not by an increase in trophic links in basal parts of the food web. Hence, our results support the "productivity hypothesis," suggesting that food chains can be longer in more productive systems. Furthermore, stable isotope data indicated that larger crayfish are more predatory than smaller crayfish in lakes with wider littoral zones. Wider littoral zones promoted the development of intrapopulation differences in trophic position whereas narrow littoral zones did not. Hence, differences in habitat quality between and within lakes seem to influence the trophic positions of omnivorous crayfish.

  8. An integrated evaluation of the persistence and effects of 4-nonylphenol in an experimental littoral ecosystem

    Energy Technology Data Exchange (ETDEWEB)

    Liber, K. [Univ. of Wisconsin, Superior, WI (United States). Lake Superior Research Inst.; Knuth, M.L.; Stay, F.S. [Environmental Protection Agency, Duluth, MN (United States). Mid-Continent Ecology Div.

    1999-03-01

    A comprehensive littoral enclosure study was conducted to assess the persistence and distribution of 4-nonylphenol (NP) in a littoral ecosystem, and to evaluate the compound`s effects on resident aquatic biota. Enclosures with a mean ({+-} SD) surface area and volume of 31.4 {+-} 3.3 m{sup 2} and 32.0 {+-} 6.4 m{sup 3}, respectively, received eleven applications at 48-h intervals with one of four different rates of NP. This created a 20-d application period which was followed by a three to fourteen month observation period, depending on the endpoint measured. Mean {+-} SD NP concentrations in the water column measured 2 h after each application averaged 5 {+-} 4, 23 {+-} 11, 76 {+-} 21, and 243 {+-} 41 {micro}g/L at nominal treatments of 3, 30, 100, and 300 {micro}g/L, respectively. Persistence in the water column was relatively short, with a dissipation half-life estimated at {le} 1.2 d. Persistence of NP in sediment and on macrophytes was substantially longer, with estimated half-lives of 28 to 104 d and 8 to 13 d, respectively. Zooplankton was the most sensitive group of organisms evaluated, with significant reductions in population abundances of some copepod taxa observed at the 23 {+-} 11-{micro}g/L treatment. Fish survival was affected at 243 {+-} 41 {micro}g/L. The most sensitive benthic macroinvertebrate taxon, Pisidium (Bivalvia) was affected at 76 {+-} 21 {micro}g/L, but most taxa were only affected at the 243 {+-} 41-{micro}g/L treatment. None of the assessed populations were affected at the 5 {+-} 4-{micro}g/L treatment. Macrophytes and periphyton were not adversely affected by any of the treatments. Overall community composition, assessed at the family level or higher, was not affected at or below the 23 {+-} 11-{micro}g/L treatment, but did exhibit substantial changes at the 243 {+-} 41-{micro}g/L treatment. Some minor changes were observed at the 76 {+-} 21-{micro}g/L treatment. The maximum acceptable toxicant concentration in the water column, based

  9. Persistence and distribution of 4-nonylphenol following repeated application to littoral enclosures

    Energy Technology Data Exchange (ETDEWEB)

    Heinis, L.J.; Liber, K.; Tunell, R.L. [Univ. of Wisconsin, Superior, WI (United States). Lake Superior Research Inst.; Knuth, M.L.; Sheedy, B.R.; Ankley, G.T. [Environmental Protection Agency, Duluth, MN (United States). Mid-Continent Ecology Div.

    1999-03-01

    The persistence and distribution of 4-nonylphenol (NP) were monitored for 440 d, following application to 18 littoral enclosures situated in a 2-ha mesotrophic pond near Duluth, Minnesota. Application was accomplished by subsurface, gravity-fed injection over a 20-d period, with a 2-d frequency, to achieve nominal aqueous concentrations of 0, 3, 30, 100, and 300 {micro}g/L. Mean maximum concentrations in the water over the 20-d application period ranged from 75.7 to 81.0% of nominal for the three highest treatment levels and was 181% of nominal at the lowest treatment level. Water was the major compartment, on a mass balance basis, for NP until 2 to 4 d after the application period, with a mean time to 50% dissipation (DT50) of 0.74 d and a mean time to 95% dissipation (DT95) of 13.8 d. 4-Nonylphenol partitioned to enclosure wall material, macrophytes, and sediment within 2 d of initial application. Macrophytes accumulated maximum NP concentrations of 11.5 and 139 mg/kg 1 to 2 d after the application period at the 30- and 300-{micro}g/L treatment levels, respectively. Mean DT50 and DT95 estimates of NP persistence in/on the macrophytes were 10.3 and 189 d, respectively. Sediment from the 30- and 300-{micro}g/L treatments accumulated maximum dry weight NP concentrations of 2.74 and 27.4 mg/kg, respectively within 20 to 48 d of the first application. The mean sediment porewater NP concentration was 18.6 {micro}g/L for the period 2 to 34 d after application 1 at the 300-{micro}g/L treatment. The sediment was the primary sink for NP 440 d after the initial application with a concentration of 1.97 mg/kg at the 300-{micro}g/L treatment. Mean sediment DT50 and DT95 values were 66.0 and 401 d, respectively, indicating a long-term persistence of NP. Ecocores collected 1 d after the final NP application did not show significant decreases in sediment NP concentration during a 55-d incubation period, corroborating the NP persistence observed in the littoral enclosures.

  10. Removal of garlic-like off-odours from crustacea by gamma irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Freeman, D.J.; Izzard, M.E. (Australian Atomic Energy Commission Research Establishment, Lucas Heights); Whitfield, F.B. (Commonwealth Scientific and Industrial Research Organization, North Ryde (Australia). Div. of Food Research)

    1985-04-01

    The strong garlic-like off-odours associated with the male shovel-nosed lobster (Ibacus peronii) and the royal red prawn (Hymenopenaeus sibogae) have been attributed principally to the presence of the sulphur-containing compound bis-(methylthio)-methane. In the male shovel-nosed lobster the concentration of this compound increases very rapidly following death, and a small number of contaminated crustacea may cause an entire consignment to be condemned. A method for removing this noxious odour was developed which involved gamma-irradiation of the affected crustacea using a cobalt-60 source. Eight lobsters were subjected to gamma-irradiation at a dose rate of 10 kGy an hour; one half of each was given a dose of 25 kGy and the other half a dose of 5 kGy. Results showed that a high dose completely removes the existing off-odour, and also prevents its further formation. With the lower dose the off-odour is not completely removed. A trial using fresh royal red prawns at doses of 0.5 and 1.0 kGy showed irradiation removed all traces of the off-odour, but in those irradiated at the higher dose a slight burnt flavour was noticeable.

  11. Are the effects of an invasive crayfish on lake littoral macroinvertebrate communities consistent over time?

    Directory of Open Access Journals (Sweden)

    Ruokonen T. J.

    2016-01-01

    Full Text Available Management of invasive species requires assessment of their effects on recipient ecosystems. However, impact assessment of invasive species commonly lacks a long-term perspective which can potentially lead to false conclusions. We examined the effects of the invasive signal crayfish (Pacifastacus leniusculus Dana on the stony littoral macroinvertebrate communities of a large boreal lake and assessed the extent to which the patterns observed in previous short-term studies were stable over time. We used temporal macroinvertebrate data collected in five consecutive years from a site with a well-established crayfish population, a site with no crayfish and a site where crayfish had been recently introduced. Our results revealed that signal crayfish had temporally rather consistent negative effects on the benthic macroinvertebrate assemblages but that the effects might be limited to certain taxa, in particular Gastropoda and Coleoptera. We also observed increases in Gastropoda density and taxa richness following a decline in crayfish density, indicating that the recovery of invertebrate assemblages might be fast. Hence, negative effects on benthic macroinvertebrates can likely be minimized by effective control of the signal crayfish population.

  12. Genetic structure of pelagic and littoral cichlid fishes from Lake Victoria.

    Directory of Open Access Journals (Sweden)

    Miyuki Takeda

    Full Text Available The approximately 700 species of cichlids found in Lake Victoria in East Africa are thought to have evolved over a short period of time, and they represent one of the largest known examples of adaptive radiation. To understand the processes that are driving this spectacular radiation, we must determine the present genetic structure of these species and elucidate how this structure relates to the ecological conditions that caused their adaptation. We analyzed the genetic structure of two pelagic and seven littoral species sampled from the southeast area of Lake Victoria using sequences from the mtDNA control region and 12 microsatellite loci as markers. Using a Bayesian model-based clustering method to analyze the microsatellite data, we separated these nine species into four groups: one group composed of pelagic species and another three groups composed mainly of rocky-shore species. Furthermore, we found significant levels of genetic variation between species within each group at both marker loci using analysis of molecular variance (AMOVA, although the nine species often shared mtDNA haplotypes. We also found significant levels of genetic variation between populations within species. These results suggest that initial groupings, some of which appear to have been related to habitat differences, as well as divergence between species within groups took place among the cichlid species of Lake Victoria.

  13. Nutrient availability modifies species abundance and community structure of Fucus-associated littoral benthic fauna.

    Science.gov (United States)

    Korpinen, Samuli; Jormalainen, Veijo; Pettay, Esko

    2010-01-01

    The brown alga Fucus vesiculosus is a foundation species in the Baltic Sea littoral, hosting a rich faunal community. We compared the species composition and diversity of invertebrate macrofauna living on F. vesiculosus between sites differing in their eutrophication status and exposure to waves at three different times during a season. We determined the size, nitrogen and phlorotannin content of the alga. The invertebrate community differed substantially between sites near fish farms and those in more pristine environment. Snails and bivalves were more abundant on the Fucus stands near fish farms than on control stands, where crustaceans were more abundant. The abundance of molluscs decreased with the increasing shore exposure, while gammaridean amphipods dominated on the exposed shores. Abundance of several taxa increased during the proceeding growing season. The density of the most important herbivore of F. vesiculosus, Idotea balthica, varied 100-fold during the season being the lowest in June and the highest in August when the generation born in the summer started to feed on Fucus. Thus, the diversity and composition of Fucus-associated invertebrate fauna varies both with environmental conditions of the stand and seasonally. Although the negative effects of eutrophication on distribution and abundance of Fucus stands are well documented, a moderate increase of nutrients was found to increase the species richness of Fucus-associated fauna in early summer.

  14. Persistence and distribution of 4-nonylphenol in water, sediment, macrophytes, and wall material of littoral enclosures

    Energy Technology Data Exchange (ETDEWEB)

    Heinis, L.J.; Tunell, R.; Liber, K. [Univ. of Wisconsin, Superior, WI (United States). Lake Superior Research Inst.; Knuth, M.L. [Environmental Protection Agency, Duluth, MN (United States). Environmental Research Lab.

    1994-12-31

    Eighteen enclosures (5 m x 10 m) were constructed in the littoral zone of a 2-ha pond near Duluth, MN. Each enclosure consisted of 5 m of natural shoreline and three walls of an inert plastic. The enclosures had an average surface area of 31.9 m{sup 2} , an average depth of 0.6 m and an average water volume of 33.1 m{sup 3}. The enclosure waters were treated with the alkyl phenol ethoxylate precursor and degradation product 4-nonylphenol. Application was accomplished by sub-surface injection over a 20-day period with a 2 day frequency. Nominal aqueous concentrations were 0, 3, 30, 100 and 300 {mu}g/L. Concentrations of 4-nonylphenol were monitored during and after application in the water, sediment, macrophytes, and enclosure wall material. Average maximum water concentrations ranged from 96.5% of nominal to 62.0% of nominal and average minimum water concentrations ranged from 33.3% of nominal to 29.5% of nominal during the application period. Water concentrations decreased exponentially after application ended. Sediment concentrations during the application period were constant from 8 to 20 d and peak concentrations occurred 48 d after application began. Macrophyte concentrations peaked 21 d after initial application with a steady decline through 76 d. Enclosure wall material concentrations reached a peak 3 h before the final application. A gradual decline occurred until 34 d after initial application followed by a more rapid dissipation.

  15. [Taxonomic composition and distribution of the echinoderms associations in the littoral ecosystems from the Colombian Pacific].

    Science.gov (United States)

    Neira, Raúl; Cantera, Jaime R

    2005-12-01

    This paper examines published information and gray literature about taxonomy and ecology of echinoderm species of the Colombian Pacific Coast. Unpublished collection data of specimens kept in the Marine Sciences Museum of the University of Valle are also considered. Sixty-six species are found in coastal ecosystems and shallow bottoms of ten geographical, coastal and insular localities of the Pacific coast of Colombia. Main habitats having echinoderms are: rocky cliffs and shores, coral reefs, sand beaches, mud substrates, mangroves, and shallow bottoms of mud, sand, gravel and rocks. Regular Echinoidea and Asteroidea are the most diverse and abundant groups, mainly in subtidal rocky shallow bottoms and coral reefs. Ophiuroidea are abundant below rocky boulders. Irregular Echinoidea are abundant on sand beaches. The relatively high number of species shows that this geographical area presents a high diversity of echinoderms compared with other tropical shallow and littoral zones of the world. Rocky substrates and coral reefs are the ecosystems with the highest numbers of echinoderm species and individuals. A conservation status assessment is difficult because the lack of periodical sampling and few data about deep zones. In general, the species reported in the last 25 years, have not experimented important changes in their populations, although in some specific places, populations may decrease because human activities in coastal areas increase sedimentation rates change some rocky substrates to mud or sand.

  16. Anthropogenic impact on environmental filamentous fungi communities along the Mediterranean littoral.

    Science.gov (United States)

    Al-Yasiri, Mohammed Hashim; Normand, Anne-Cécile; Mauffrey, Jean-François; Ranque, Stéphane

    2017-07-01

    We hypothesised that anthropogenic influences impact the filamentous fungi community structure and that particular species or species patterns might serve as markers to characterise ecosystems. This study aimed to describe the filamentous fungi community structure in various biotopes along the Mediterranean shore that were exposed to various levels of anthropogenic influence. We sampled filamentous fungi from yellow-legged gull faecal samples at five study sites along the Mediterranean littoral in southern France. The sites were characterised by variable anthropogenic influence, ranging from building rooftops in two cities to a natural reserve. The sites also included two suburban ecoclines, one of which was exposed to sewer pollution. Filamentous fungal colonies were quantified and identified via MALDI-TOF mass spectrometry. Interestingly, we found that both fungal diversity and abundance were low in urban areas compared with suburban ecocline or environments little affected by anthropogenic influence. Furthermore, some fungal species were clearly associated with particular environments. In particular, Mucor circinelloides was associated with a natural environment with little anthropogenic impact and distant from human settlements. Whereas, Scedosporium apiospermum was associated with an ecocline polluted by sewage. Our findings indicate that particular fungal species or species combination might be used as surrogate markers of ecosystems exposed to anthropogenic pollution. © 2017 Blackwell Verlag GmbH.

  17. Restoring ecosystem services to littoral zones of rivers in the urban core of Chongqing, China.

    Science.gov (United States)

    Xian, Xu-Dong; Feng, Yi-Long; Willison, J H Martin; Ai, Li-Jiao; Wang, Ping; Wu, Zhi-Neng

    2015-08-01

    Two examples of the creation of naturalized areas in the littoral zone of the Three Gorges Reservoir in the urban core of Chongqing City, China, are described. The areas were created for the purpose of restoring ecological functions and services. Plants were selected based on surveys of natural wetland vegetation in the region, and experiments were conducted to discover the capacity of species of interest to survive the sometimes extreme hydrological regimes at the sites. Novel methods were developed to stabilize the plants against the rigors of extreme summer floods and constant swash, notably zigzag berms of rocks wrapped in iron mesh. The areas include native reeds, grasses, shrubs, and trees. Plant communities in the areas are zoned according to flooding stress, and their structure is less stable at lower elevations that are subjected to greater stress. The tall grass Saccharum spontaneum (widespread in Southern Asia) and the tree Pterocarya stenoptera (native to Southwest China) are notable for their utility at these sites in the center of a large city. Communities of tall reeds and grasses have become so dense and stable that they now provide the ecosystem services of capturing river sediments and resisting erosion of the river banks. It is recommended that extensive greening of the riparian zones in urban areas of the Three Gorges Reservoir be conducted for the purpose of providing ecosystem services, based in part on the experiences described here.

  18. Biotic interactions within the littoral community of Swedish forest lakes during acidification

    Energy Technology Data Exchange (ETDEWEB)

    Appelberg, M. (Inst. of Freshwater Research, Drottningholm (Sweden)); Henrikson, B.I. (Gothenburg Univ. (Sweden). Dept. of Zoology); Henrikson, L. (Municipality of Mark, Kinna (Sweden)); Svedaeng, M. (Uppsala Univ. (Sweden). Dept. of Limnology)

    1993-01-01

    This paper presents an integrated response of abiotic and biotic factors to the acidification process in littoral communities in Swedish forest lakes. In structuring the acidified community three major forces can be recognized. Firstly, abiotic variation, including changed water chemistry and habitat structure, has a strong impact on all trophic levels. Low pH and increased toxicity of metals, especially aluminium, are ultimate causes of the extinction and succession of species during acidification. In the acidified community, the abiotic factors affect both the top-down and bottom-up forces, and changes can be triggered at all trophic levels. The second force structuring the community is a bottom-up effect caused by reduced nutrient cycling and a shift in plant heterogeneity. This shift, mainly resulting from a shift in the CO[sub 2]-system of the water and increased water transparency, enhances the biomass of primary producers, e.g. Sphagnum and Juncus, and alters habitat heterogeneity in higher trophic levels. The third force structuring the acid community is a top-down effect; the loss of the fourth link in the food chain (fish) alters the impact on the third trophic level. From being mainly regulated by predation from fish, the heterogeneity of the third level will be regulated by abiotic variation and competition in the acid state. This effect cascades down the food web, and the second trophic level, the herbivores, will now be preyed upon by invertebrates instead of fish. (89 refs., 6 figs.)

  19. Habitat selection by three littoral zone fishes: effects of predation pressure, plant density and macrophyte type

    Science.gov (United States)

    Chick, J.H.; McIvor, C.C.

    1997-01-01

    We conducted laboratory experiments which demonstrated that three littoral zone fishes differentially selected among three macrophytes when seeking refuge from predation. In the presence of a predator (a juvenile Micropterus salmoides), mosquitofish (Gambusia holbrooki), sailfin mollies (Poecilia latipinna). and dollar sunfish (Lepomis marginatus) displayed ferential use of four tank areas containing patches of either Hydrilla verticillata, Potamogeton illinoensis, Panicum hemitomon, or no plants. Patterns habitat selection, and the consistency of these patterns among replicates, differed among the three fishes and among three plant-density treatments - natural (each macrophyte presented at its mean field density), equal (all three macrophytes at the same density), and control (no plants). Selection for H. verticillata by mosquitofish was significant for both the equal and natural treatments, and thus was not caused by differences in plant density alone. Sailfin mollies displayed significant selection for H. verticillata only in the natural plant-density treatments. Dollar sunfish showed less consistent habitat selection than either mosquitofish or sailfin mollies. Significant habitat selection was not found in the absence of a predator, and there was no evidence for lection among the tank areas in control treatments. Patterns of habitat selection by the three fishes in our laboratory study corresponded to observed habitat use in Lake Okeechobee.

  20. Impact of pesticide contamination on aquatic microorganism populations in the littoral zone.

    Science.gov (United States)

    Lew, S; Lew, M; Biedunkiewicz, A; Szarek, J

    2013-04-01

    The effect of pesticide contamination of the littoral zone on the population of bacteria and fungi was analyzed using the example of a eutrophic water reservoir exposed for >30 years to the influence of expired crop-protection chemicals, mainly DDT. For three consecutive years, quantity analyses of bacteria and fungi were conducted and the composition of the microorganism population analyzed against seasonal dynamics. Mold and yeast-like fungi were also isolated and identified. Within the Bacteria domain, in addition to the large groups of microorganisms (Alphaprotobacteria, Betaprobacteria, and Gammaproteobacteria, Actinobacteria, and Cytophaga-Flavobacterium), the analysis also involved the presence of bacteria predisposed to degraded pesticides in natural environments: Pseudomonas spp. and Alcaligenes spp. The quantity dynamics of aquatic microorganisms indicated that bacteria and fungi under the influence of long-term exposure to DDT can adapt to the presence of this pesticide in water. No modifying effect of DDT was observed on the quantity of microorganisms or the pattern of seasonal relationships in the eutrophic lake. Changes were shown in the percentage share of large groups of bacteria in the community of microorganisms as was an effect of contamination on the species diversity of fungi. The data show the effectiveness of aquatic microorganism-community analyses as a tool for indicating changes in the water environment caused by pesticide contamination.

  1. Diversity of cyanobacterial species and phylotypes in biofilms from the littoral zone of Lake Baikal.

    Science.gov (United States)

    Sorokovikova, Ekaterina G; Belykh, Olga I; Gladkikh, Anna S; Kotsar, Oleg V; Tikhonova, Irina V; Timoshkin, Oleg A; Parfenova, Valentina V

    2013-12-01

    The majority of naturally occurring biofilms contain numerous microorganisms that have not yet been cultured. Additionally, there is little information available regarding the genetic structure and species diversity of these communities. Therefore, we characterised the species diversity, structure and metagenome of biofilms grown on stones and steel plates in the littoral zone of Lake Baikal (East Siberia, Russia) by applying three different approaches. First, light microscopy enabled identification of the species diversity of biofilm-forming cyanobacteria on different substrates with the dominance of Rivularia rufescens, Tolypothrix limbata, Chamaesiphon fuscus, Ch. subglobosus, and Heteroleibleinia pusilla. Additionally, scanning electron microscopy was used to show the spatial structure of biofilms. Finally, sequence analysis of 30,660 16S rRNA clones indicated a high diversity within the biofilm communities, with the majority of the microbes being closely related to Cyanobacteria (8-46% sequences), Proteobacteria (14-43%), and Bacteroidetes (10-41%). Rivularia sp., Pseudanabaena sp., and Chamaesiphon spp. were the dominant cyanobacterial phylotypes.

  2. Applying a reservoir functional-zone paradigm to littoral bluegills: differences in length and catch frequency?

    Science.gov (United States)

    Ruhl, Nathan; DeAngelis, Holly; Crosby, Abigale M; Roosenburg, Willem M

    2014-01-01

    Reservoirs exhibit gradients in conditions and resources along the transition from lotic to lentic habitat that may be important to bluegill ecology. The lotic-lentic gradient can be partitioned into three functional zones: the riverine, transitional, and lacustrine zones. We measured catch frequency and length of bluegills (Lepomis macrochirus) captured along the periphery of these areas (i.e., in the littoral zone of each functional zone) for four small reservoirs in Southeastern Ohio during the summer months of three years. Catch frequency differed between zones for two reservoirs, but these differences were not observed in other years. There was no relationship between reservoir zone and either standard length or catch frequency when the data for all reservoirs were pooled, but we did observe a bimodal length distribution in all reservoirs. A combination of ecological factors including inter and intraspecific competition, predation intensity, management practices, limnology, and assemblage complexity may be mitigating bluegill distribution and abundance in reservoirs. Therefore, a functional zone (categorical) approach to understanding bluegill ecology in reservoirs may not be appropriate.

  3. Applying a reservoir functional-zone paradigm to littoral bluegills: differences in length and catch frequency?

    Directory of Open Access Journals (Sweden)

    Nathan Ruhl

    2014-08-01

    Full Text Available Reservoirs exhibit gradients in conditions and resources along the transition from lotic to lentic habitat that may be important to bluegill ecology. The lotic–lentic gradient can be partitioned into three functional zones: the riverine, transitional, and lacustrine zones. We measured catch frequency and length of bluegills (Lepomis macrochirus captured along the periphery of these areas (i.e., in the littoral zone of each functional zone for four small reservoirs in Southeastern Ohio during the summer months of three years. Catch frequency differed between zones for two reservoirs, but these differences were not observed in other years. There was no relationship between reservoir zone and either standard length or catch frequency when the data for all reservoirs were pooled, but we did observe a bimodal length distribution in all reservoirs. A combination of ecological factors including inter and intraspecific competition, predation intensity, management practices, limnology, and assemblage complexity may be mitigating bluegill distribution and abundance in reservoirs. Therefore, a functional zone (categorical approach to understanding bluegill ecology in reservoirs may not be appropriate.

  4. Arsenosugars and other arsenic compounds in littoral zone algae from the Adriatic Sea.

    Science.gov (United States)

    Slejkovec, Zdenka; Kápolna, Emese; Ipolyi, Ildi; van Elteren, Johannes T

    2006-05-01

    In 10 different marine algae from the littoral zone (found between the highest and lowest tide marks on the seashore) arsenic compounds were determined by means of a high-performance liquid chromatography (anion and cation exchange)-UV photochemical digestion-hydride generation-atomic fluorescence spectrometry (HPLC-UV-HGAFS) system. Samples (Ceramium sp., Cystoseira barbata, Enteromorpha sp., Fucus virsoides, two different species of Gelidium, Padina pavonica, Polisyphonia sp. and Ulva rigida) were collected along the Adriatic Sea coast of Slovenia. The total arsenic content of the algal samples, as determined by ICP-MS, ranged from 1.35 to 28.1 microg g(-1) (fresh weight). In all algae but two, the most abundant arsenic species found were arsenosugars with minor amounts of other arsenic compounds. Cystoseira barbata and Ceramium sp. contained high amounts of mainly inorganic arsenic. A small quantity of arsenobetaine was detected in most of the investigated Adriatic algae, which probably originates from mesofauna attached to the algae in their natural habitat.

  5. Beach morphology monitoring in the Columbia River Littoral Cell: 1997-2005

    Science.gov (United States)

    Ruggiero, Peter; Eshleman, Jodi L.; Kingsley, Etienne; Thompson, David M.; Voigt, Brian; Kaminsky, George M.; Gelfenbaum, Guy

    2007-01-01

    This report describes methods used, data collected, and results of the Beach Morphology Monitoring Program in the Columbia River Littoral Cell (CRLC) from 1997 to 2005. A collaborative group primarily consisting of the US Geological Survey and the Washington State Department of Ecology performed this work. Beach Monitoring efforts consisted of collecting topographic and bathymetric horizontal and vertical position data using a Real Time Kinematic Differential Global Positioning System (RTK-DGPS). Sediment size distribution data was also collected as part of this effort. The monitoring program was designed to: 1) quantify the short- to medium-term (seasonal to interannual) beach change rates and morphological variability along the CRLC and assess the processes responsible for these changes; 2) collect beach state data (i.e., grain size, beach slope, and dune/sandbar height/position) to enhance the conceptual understanding of CRLC functioning and refine predictions of future coastal change and hazards; 3) compare and contrast the scales of environmental forcing and beach morphodynamics in the CRLC to other coastlines of the world; and 4) provide beach change data in a useful format to land use managers.

  6. A cladistic analysis of the genera of Macrothricidae Norman & Brady (Crustacea, Cladocera, Radopoda Análise cladística dos gêneros de Macrothticidae Norman & Brady (Crustacea, Cladocera, Radopoda

    Directory of Open Access Journals (Sweden)

    Lourdes M. A. Elmoor-Loureiro

    2005-09-01

    Full Text Available A cladistic analysis of the genera of the Macrothricidae (Crustacea, Cladocera, Radopoda was performed based on 36 morphological characters, and including 15 terminal taxa (three as outgroups. The single tree obtained from this analysis supported the monophyly of Macrothricidae and Macrothricinae. The group called as "non-Macrothricinae" was indicated as paraphyletic. Neothricidae was also not supported.Foi conduzida uma análise cladística dos gêneros sul-americanos de Macrothricidae (Crustacea, Cladocera, Radopoda com base em 36 caracteres morfológicos e incluindo 15 taxa terminais (três como grupos externos. Uma única árvore foi obtida pela análise, a qual suporta o monofiletismo de Macrothricidae e de Macrothricinae. O grupo chamado de "não-Macrothricinae" é indicado como parafilético. Neothricidae também não encontrou suporte.

  7. First record of Puerulus mesodontus Chan, Ma & Chu, 2013 (Crustacea, Decapoda, Achelata, Palinuridae) from south of Java, Indonesia.

    Science.gov (United States)

    Wardiatno, Yusli; Hakim, Agus Alim; Mashar, Ali; Butet, Nurlisa Alias; Adrianto, Luky; Farajallah, Achmad

    2016-01-01

    Three specimens of Puerulus mesodontus Chan, Ma & Chu, 2013 (Crustacea, Decapoda, Achelata, Palinuridae) were collected from Palabuhanratu Bay, southern Java, Indonesia. There is no previous record on the presence of the species in Indonesia. This finding represents the first record of this species in Java, Indonesia, and confirms that the species is present in the Indian Ocean. The morphological characters of the species are described. This paper contains a new distribution record of a lobster species from Indonesian waters.

  8. Population structure and reproductive biology of Mesopodopsis orientalis (Crustacea: Mysida) in a tropical mangrove ecosystem in India

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Panampunnayil, S.U.

    , Sawamoto (1985) obtained an opposite result for the same species in neighboring water of Japan. Delgado et al. (1997) mentioned that clutch size of Mesopodopsis slabberi (van Beneden) vary depending on the geographic populations or different...) Fisheries of planktonic shrimp and shrimp-like in the Gulf of Thailand. Thai Fish Gazet 35, 67 – 88. Delgado L., Guerao G. and Ribera C. (1997) Biology of the mysid Mesopodopsis slabberi (van Beneden, 1861) (Crustacea, Mysidacea) in the coastal lagoon...

  9. Modeling subsurface transport in extensive glaciofluvial and littoral sediments to remediate a municipal drinking water aquifer

    Directory of Open Access Journals (Sweden)

    M. Bergvall

    2011-07-01

    Full Text Available Few studies have been carried out that cover the entire transport process of pesticides, from application at the soil surface, through subsurface transport, to contamination of drinking water in esker aquifers. In formerly glaciated regions, such as Scandinavia, many of the most important groundwater resources are situated in glaciofluvial eskers. The purpose of the present study was to model and identify significant processes that govern subsurface transport of pesticides in extensive glaciofluvial and littoral sediments. To simulate the transport processes, we coupled a vadose zone model at soil profile scale to a regional groundwater flow model. The model was applied to a municipal drinking-water aquifer, contaminated with the pesticide-metabolite BAM (2,6-dichlorobenzoamide. At regional scale, with the combination of a ten-meter-deep vadose zone and coarse texture, the observed concentrations could be described by the model without assuming preferential flow. A sensitivity analysis revealed that hydraulic conductivity in the aquifer and infiltration rate accounted for almost half of the model uncertainty. The calibrated model was applied to optimize the location of extraction wells for remediation, which were used to validate the predictive modeling. Running a worst-case scenario, the model showed that the establishment of two remediation wells would clean the aquifer in four years, compared to nine years without them. Further development of the model would require additional field measurements in order to improve the description of macrodispersion in deep, sandy vadose zones. We also suggest that future research should focus on characterization of the variability of hydraulic conductivity and its effect on contaminant transport in eskers.

  10. Medicinal plants used by women from Agnalazaha littoral forest (Southeastern Madagascar)

    Science.gov (United States)

    2013-01-01

    Background The country of Madagascar is renowned for its high level of biodiversity and endemism, as well as the overwhelming pressures and threats placed on the natural resources by a growing population and climate change. Traditional medicine plays an important role in the daily lives of the Malagasy for various reasons including limited access to healthcare, limited markets and traditional values. The objective of this study was to assess the modern utitilization of the Agnalazaha Forest by the local population in Mahabo-Mananivo, Madagascar, for medicinal plants used by women, and to establish a list of medicinal plants used by women sourced from Agnalazaha Forest. Methods Ethnobotanical studies were conducted over a period of five months in 2010 to determine the diversity of medicinal plants used by women in the commune of Mahabo-Mananivo. In all, 498 people were interviewed, both male and female ranging age from 15 to over 60 years old. Results 152 medicinal plants used by local people were collected during the ethnobotanical studies. Among the recorded species, eight native species are widely used by women. These species are known for their therapeutic properties in treating placental apposition and complications during childbirth as well as tropical illnesses such as malaria, filariasis, and sexual diseases like gonorrhea and syphilis. Conclusions Littoral forests are rare ecosystems that are highly threatened on the island nation of Madagascar. Our investigation into the use of medicinal plants sourced from and around the Agnalazaha Forest by the women of Mahabo-Mananivo reinforces the need for this natural resource as a first line of health care for rural families. PMID:24188563

  11. Effects of littoral habitat complexity and sunfish composition on fish production

    Science.gov (United States)

    Carey, M.P.; Maloney, K.O.; Chipps, S.R.; Wahl, David H.

    2010-01-01

    Habitat complexity is a key driver of food web dynamics because physical structure dictates resource availability to a community. Changes in fish diversity can also alter trophic interactions and energy pathways in food webs. Few studies have examined the direct, indirect, and interactive effects of biodiversity and habitat complexity on fish production. We explored the effects of habitat complexity (simulated vegetation), sunfish diversity (intra- vs. inter-specific sunfish), and their interaction using a mesocosm experiment. Total fish production was examined across two levels of habitat complexity (low: 161 strands m-2 and high: 714 strands m-2) and two sunfish diversity treatments: bluegill only (Lepomis macrochirus) and bluegill, redear sunfish (Lepomis microlophus), and green sunfish (Lepomis cyanellus) combination. We also measured changes in total phosphorus, phytoplankton, periphyton, and invertebrates to explain patterns in fish production. Bluegill and total fish production were unaffected by the sunfish treatments. Habitat complexity had a large influence on food web structure by shifting primary productivity from pelagic to a more littoral pathway in the high habitat treatments. Periphyton was higher with dense vegetation, leading to reductions in total phosphorus, phytoplankton, cladoceran abundance and fish biomass. In tanks with low vegetation, bluegill exhibited increased growth. Habitat complexity can alter energy flow through food webs ultimately influencing higher trophic levels. The lack of an effect of sunfish diversity on fish production does not imply that conserving biodiversity is unimportant; rather, we suggest that understanding the context in which biodiversity is important to food web dynamics is critical to conservation planning. ?? 2010 John Wiley & Sons A/S.

  12. Distribution and relative abundance of fishes in littoral areas of Chief Joseph Reservoir, Columbia River

    Science.gov (United States)

    Gadomski, Dena M.; Venditti, David A.; Robinson, T. Craig; Beeman, John W.; Maule, Alec G.

    2004-01-01

    We surveyed fish assemblages in littoral areas of Chief Joseph Reservoir of the upper Columbia River to aid in understanding this ecosystem. Fish distributions and abundances were examined during April-July 1999 in relation to environmental conditions in the reservoir. We also compared the fish assemblages in Chief Joseph reservoir in 1999 to a past study conducted during 1974-1975, and to assemblages in other areas of the Columbia River. During 67 hr of electrofishing and 78 beach seine hauls in Chief Joseph Reservoir, 7460 fishes representing 8 families were collected. The majority of the catch was native – northern pikeminnow; redside shiners; longnose, bridgelip, and largescale suckers; and sculpins. The most abundant introduced species was walleye, and one species, rainbow trout, was mostly of net-pen origin. Larger sizes of suckers and northern pikeminnow were most abundant in the upper reservoir, likely due to upstream spawning migrations. The lower reservoir contained greater abundances of smaller fishes, and this area had lower flows, smaller substrates, and more complex shorelines that offered these fishes refugia. Only adult suckers displayed significant differences in abundances related to substrate. The relative abundances of species appeared to have changed since the 1970s, when the dominant fishes were northern pikeminnow, peamouth, largescale suckers, and walleye. Fish assemblage differences between Chief Joseph Reservoir and lower Columbia River reservoirs were also evident due to the morphology of the reservoir, its more northerly location, and the lack of fish passage facilities at Chief Joseph Dam. Our study is one of the few descriptions of fishes in the upper Columbia Rivers.

  13. The impact of sediment removal on the aquatic macroinvertebrate assemblage in a fishpond littoral zone

    Directory of Open Access Journals (Sweden)

    Zdeněk ADÁMEK

    2011-02-01

    Full Text Available Bottom sediment removal, a widely used technique in restoration management of standing water bodies, has a strong influence on communities of aquatic organisms. As most information on the impact of sediment removal on the aquatic environment comes from studies on lakes, the aim of this study was to describe macroinvertebrate assemblage succession in a fishpond (Štěpánek fishpond, Bohemian-Moravian highlands, Czech Republic littoral zone following restoration by sediment removal during the winter of 2003/2004. Semi-quantitative hand net sampling was undertaken one year before (2003 and in each of the following five years (2004–2008 after sediment removal. A significant decrease in both abundance (approx. 90% of individuals and diversity (approx. 30% of taxa of macroinvertebrates was detected immediately after pond restoration. The values gradually increased over subsequent years, reaching comparable abundance and diversity three years after sediment removal. A significant shift was recorded in the taxonomic and functional composition of the macroinvertebrate assemblage after sediment removal. Mayfly larvae were the dominant invertebrates before restoration, while chironomid larvae and oligochaetes dominated after sediment removal. Phytophilous taxa, grazers and scrapers, and swimming or diving invertebrates were common in 2003, whilst open-water taxa preferring mud and other mostly inorganic microhabitats, gatherers/collectors, and burrowing/boring invertebrates were relatively common after sediment removal. In 2008, the assemblage reverted towards the situation before sediment removal, probably connected with a lower water level and accelerated macrophyte bed succession. Principal Component Analysis on the species data confirmed the differences in invertebrate taxonomic structure among sampling years. Succession of the fishpond invertebrate assemblage in the years following sediment removal was mainly influenced by fish farming practice and

  14. Effects of repeated exposure to 4-nonylphenol on the zooplankton community in littoral enclosures

    Energy Technology Data Exchange (ETDEWEB)

    O`Halloran, S.L.; Liber, K.; Gangl, J.A. [Univ. of Wisconsin, Superior, WI (United States). Lake Superior Research Inst.; Knuth, M.L. [Environmental Protection Agency, Duluth, MN (United States). Mid-Continent Ecology Div.

    1999-03-01

    The effects of 4-nonylphenol (NP) on freshwater zooplankton were evaluated in 18 littoral enclosure mesocosms in northeastern Minnesota. The 18 enclosures were allocated to three blocks of six units with each block including two untreated control enclosures and one enclosure for each of four NP treatments. Treated enclosures received 11 applications of NP over a 20-d period between July 8 and 28, 1993. Maximum NP concentrations measured in the water column 2 h after each application averaged ({+-} SD) 5 {+-} 4, 23 {+-} 11, 76 {+-} 21, and 243 {+-} 41 {micro}g/L over the 11 applications. Nonylphenol dissipated rapidly from the water column but was more persistent in sediments and in/on macrophytes. All cladoceran and copepod taxa were significantly reduced in abundance at 243 {+-} 41 {micro}g/L; some sensitive taxa were also affected by 76 {+-} 21 and 23 {+-} 11 {micro}g/L. While many rotifer taxa were unaffected at any of the test concentrations, several were affected at {ge} 76 {+-} 21 {micro}g/L. Ostracods were only affected at 2,243 {+-} 41 {micro}g/L. No zooplankton taxon was affected at 5 {+-} 4 {micro}g/L. The period of maximum impact usually occurred within 1 to 7 d of the last NP application, and recovery to control abundance levels generally occurred within 7 to 28 d of the last NP application. Two sensitive taxa, Acroperus and Calanoida, did not recover at {ge} 76 {+-} 21 {micro}g/L by the end of the study. The maximum acceptable toxicant concentration for protection of all zooplankton taxa was estimated at {approximately} 10 {micro}g/L, although overall community diversity was unaffected at 23 {+-} 11. The water was the most probable route of NP exposure, but the greater persistence of NP residues in/on macrophytes may have contributed to the lack of recovery of some macrophyte-associated taxa.

  15. Modeling subsurface transport in extensive glaciofluvial and littoral sediments to remediate a municipal drinking water aquifer

    Directory of Open Access Journals (Sweden)

    M. Bergvall

    2011-02-01

    Full Text Available Few studies have been carried out that cover the entire transport process of pesticides, from application at the soil surface, through subsurface transport, to contamination of drinking water in esker aquifers. In formerly glaciated areas, such as Scandinavia, many of the most important groundwater resources are situated in glaciofluvial eskers. The purpose of the present study was to model and identify significant processes that govern subsurface transport of pesticides in extensive glaciofluvial and littoral sediments. To simulate the transport processes, we coupled a vadose zone model at the point scale to a regional groundwater flow model. The model was applied to a municipal drinking-water aquifer, contaminated with the pesticide-metabolite BAM (2,6-dichlorobenzoamide. A sensitivity analysis revealed that hydraulic conductivity and infiltration rate accounted for almost half of the model uncertainty. For a ten-meter-deep vadose zone of coarse texture, macropore flow was found to be of minor importance for contaminant transport. The calibrated model was applied to optimize the location of extraction wells for remediation, which were used to verify the predictive modeling. Running a worst-case scenario, the model showed that the establishment of two remediation wells would clean the aquifer in four years, compared to nine years without them. Further development of the model would require additional field measurements to assess the importance of macropore flow in deep, sandy aquifers. We also suggest that future research should focus on characterization of the variability of hydraulic conductivity and its effect on contaminant transport in eskers.

  16. The occurrence of microplastic contamination in littoral sediments of the Persian Gulf, Iran.

    Science.gov (United States)

    Naji, Abolfazl; Esmaili, Zinat; Mason, Sherri A; Dick Vethaak, A

    2017-07-14

    Microplastics (MPs; <5 mm) in aquatic environments are an emerging contaminant of concern due to their possible ecological and biological consequences. This study addresses that MP quantification and morphology to assess the abundance, distribution, and polymer types in littoral surface sediments of the Persian Gulf were performed. A two-step method, with precautions taken to avoid possible airborne contamination, was applied to extract MPs from sediments collected at five sites during low tide. MPs were found in 80% of the samples. Across all sites, fiber particles were the most dominate shape (88%), followed by films (11.2%) and fragments (0.8%). There were significant differences in MP particle concentration between sampling sites (p value <0.05). The sediments with the highest numbers of MPs were from sites in the vicinity of highly populated centers and municipal effluent discharges. FTIR analysis showed that polyethylene (PE), nylon, and polyethylene terephthalate (PET) were the most abundant polymer types. More than half of the observed MPs (56%) were in the size category of 1-4.7 mm length, with the remaining particles (44%) being in the size range of 10 μm to <1 mm. Compared to literature data from other regions, intertidal sediments in the Persian Gulf cannot be characterized as a hot spot for MP pollution. The present study could, however, provide useful background information for further investigations and management policies to understand the sources, transport, and potential effects on marine life in the Persian Gulf.

  17. Exposure of juvenile green frogs (Lithobates clamitans) in littoral enclosures to a glyphosate-based herbicide.

    Science.gov (United States)

    Edge, Christopher B; Gahl, Megan K; Pauli, Bruce D; Thompson, Dean G; Houlahan, Jeff E

    2011-07-01

    The majority of studies on the toxicity of glyphosate-based herbicides to amphibians have focused on larval life stages exposed in aqueous media. However, adult and juvenile amphibians may also be exposed directly or indirectly to herbicides. The potential for such exposures is of particular interest in the littoral zone surrounding wetlands as this is preferred habitat for many amphibian species. Moreover, it may be argued that potential herbicide effects on juvenile or adult amphibians could have comparatively greater influence on overall recruitment, reproductive potential and thus stability of local populations than effects on larvae. In this experiment, juvenile green frogs (Lithobates clamitans) were exposed to two concentrations (2.16 and 4.27 kg a.e./ha) of a glyphosate-based herbicide formulation (VisionMax®), which were based on typical application scenarios in Canadian forestry. The experimental design employed frogs inhabiting in situ enclosures established at the edge of small naturalized wetlands that were split in half using an impermeable plastic barrier. When analyzed using nominal target application rates, exposure to the glyphosate-based herbicide had no significant effect on survival, body condition, liver somatic index or the observed rate of Batrachochytrium dendrobatidis infection. However, there were marginal trends in both ANOVA analysis and post-hoc regressions regarding B. dendrobatidis infection rates and liver somatic index in relation to measured exposure estimates. Results from this study highlight the importance of field research and the need to include multiple endpoints when examining potential effects of a contaminant on non-target organisms. Copyright © 2011 Elsevier Inc. All rights reserved.

  18. Strong influence of the littoral zone on sedimentary lipid biomarkers in a meromictic lake.

    Science.gov (United States)

    Bovee, R J; Pearson, A

    2014-11-01

    Planktonic sulfur bacteria growing in zones of photic zone euxinia (PZE) are important primary producers in stratified, sulfur-rich environments. The potential for export and burial of microbial biomass from anoxic photic zones remains relatively understudied, despite being of fundamental importance to interpreting the geologic record of bulk total organic carbon (TOC) and individual lipid biomarkers. Here we report the relative concentrations and carbon isotope ratios of lipid biomarkers from the water column and sediments of meromictic Mahoney Lake. The data show that organic matter in the central basin sediments is indistinguishable from material at the lake shoreline in both its lipid and carbon isotopic compositions. However, this material is not consistent with either the lipid profile or carbon isotope composition of biomass obtained directly from the region of PZE. Due to the strong density stratification and the intensive carbon and sulfur recycling pathways in the water column, there appears to be minimal direct export of the sulfur-oxidizing planktonic community to depth. The results instead suggest that basinal sediments are sourced via the littoral environment, a system that integrates an indigenous shoreline microbial community, the degraded remains of laterally rafted biomass from the PZE community, and detrital remains of terrigenous higher plants. Material from the lake margins appears to travel downslope, traverse the strong density gradient, and become deposited in the deep basin; its final composition may be largely heterotrophic in origin. This suggests an important role for clastic and/or authigenic minerals in aiding the burial of terrigenous and mat-derived organic matter in euxinic systems. Downslope or mineral-aided transport of anoxygenic, photoautotrophic microbial mats may have been a significant sedimentation process in early Earth history. © 2014 John Wiley & Sons Ltd.

  19. Chemical Properties of the Forest Litter in Istria and the Croatian Littoral

    Directory of Open Access Journals (Sweden)

    Špoljar Andrija

    2014-08-01

    Full Text Available The experiment was set up in the forest ecosystem with diverse vegetation zones in the area of Istria and the Croatian Littoral. Research included the following systematic soil units: lithic lepto-sols, rendzic leptosols, rendzic leptosols - eroded, mollic leptosols, chromic cambisol and chromic luvisols. The average quantity of the forest litter in the studied systematic soil units reaches 13.36 t/ha (Tables 1-3. The “wealth” of organic matter in the studied soil units can be presented with the following series: chromic cambisols (CMx > mollic leptosols (LPm, organogenic, rendzic leptosols (LPk > lithic leptosols (LPq > chromic cambisols (CMx - Terra rossa, chromic luvi-sols (LVx > rendzic leptosols (LPk - eroded. As expected, the lowest value of total nitrogen was found in the lithic leptosols in relation to almost all the other soils, except when compared with chromic cambisol and rendzic leptosols (p ⋋ 0.05. The statistically justified higher values of the percentage share of P2O5 in the forest litter were found in chromic luvisols and rendzic leptosols - eroded in relation to the other studied soils. Significantly higher level of copper contamination was inside rendzic leptosols - eroded in relation to the other studied soils. The exception is rendzic leptosols (p ⋋ 0.05. A significantly higher zinc content was detected in the lithic leptosols in relation to the other soil units, except for chromic luvisols, while a justifiably higher total lead and cadmium content in the forest litter was observed in chromic luvisols in relation to the other compared soils (p ⋋ 0.05.

  20. Tree dispersal strategies in the littoral forest of Sainte Luce (SE-Madagascar).

    Science.gov (United States)

    Bollen, An; Van Elsacker, Linda; Ganzhorn, Jorg U

    2004-05-01

    Zoochory is the most common mode of seed dispersal for the majority of plant species in the tropics. Based on the assumption of tight plant-animal interactions several hypotheses have been developed to investigate the origin of life history traits of plant diaspores and their dispersers, such as species-specific co-evolution, the low/high investment model (low investment in single fruits but massive fruiting to attract many different frugivores versus high investment in single fruits and fruit production for extended periods to provide food for few frugivores), and the evolution of syndromes which represent plant adaptations to disperser groups (e.g. birds, mammals, mixed). To test these hypotheses the dispersal strategies of 34 tree species were determined in the littoral forest of Sainte Luce (SE-Madagascar) with the help of fruit traps and tree watches. The impact of fruit consumers on the seeds was determined based on detailed behavioral observations. Phenological, morphological and biochemical fruit traits from tree species were measured to look for co-variation with different types of dispersal. No indication for species-specific co-evolution could be found nor any support for the low/high investment model. However dispersal syndromes could be distinguished as diaspores dispersed by birds, mammals or both groups (mixed) differ in the size of their fruits and seeds, fruit shape, and seed number, but not in biochemical traits. Five large-seeded tree species seem to depend critically on the largest lemur, Eulemur fulvus collaris, for seed dispersal. However, this does not represent a case of tight species-specific co-evolution. Rather it seems to be the consequence of the extinction of the larger frugivorous birds and lemurs which might also have fed on these large fruits. Nevertheless these interactions are of crucial importance to conserve the integrity of the forest.

  1. Survey of pesticide application on vegetables in the Littoral area of Togo.

    Science.gov (United States)

    Adjrah, Yao; Dovlo, Agbéko; Karou, Simplice D; Eklu-Gadegbeku, Kwashie; Agbonon, Amégnona; de Souza, Comlan; Gbeassor, Messanvi

    2013-01-01

    Vegetable production in Togo is seriously affected by pests attack. To reduce damage, farmers indiscriminately use pesticides. Various studies have reported high concentrations of pesticide residues more than acceptable limits in vegetables and other edible food. The aim of the presented study is to study the attitudes and practices developed by vegetable growers about pesticides applications. A standardized questionnaires which included socio-professional factors, provisions and operations concerning the use of varieties of pesticides were addressed to 150 growers in vegetable farms along the Littoral of Togo. In order to complete data concerning pesticides, seven runoff private companies and agents of the 'Direction de la Protection des Végétaux' were interviewed. Data were statistical treated using Sphinx Plus. The survey showed that vegetable growers have an acceptable educational level (36% have more than 7 years of formal education) to exploit instructions concerning pesticide use, but more than 97% do not use recommended tools. Only 21% of them received training for pesticide use. Moreover, 84% of them did not usually wear gloves, and less than 30% used oro-nasal masks. Failure to observe minimum intervals between pesticide application and sale is worrying because extremely hazardous (Carbofuran and Cadusaphos) or moderately toxic (Cypermethrin, Dimethoate, Endosulfan, Chlorpyrifos-ethyl, Fipronil) are the products currently used. The presented study indicates that pesticides application in the survey area represents a potential risk for the environment, farmers and consumers. More investigations are needed to quantify pesticides residues on the vegetables currently con,umed and moreover, to determine the potential effect of those products on human and animals health.

  2. Late Holocene morphodynamics in the littoral zone of the Iwik Peninsula area (Banc d'Arguin — Mauritania)

    Science.gov (United States)

    Barusseau, J. P.; Certain, R.; Vernet, R.; Saliège, J. F.

    2010-09-01

    In the littoral zone of the Banc d'Arguin both littoral sedimentary units and man-made deposits (shell-middens) abound. They were formed during the Late Holocene after the final onset of the post-glacial transgression. Here, a geo-archaeological approach is used to study them. The geomorphological and sedimentological characteristics of the coastal features define two distinct coastal sedimentary units in the Iwik-Aouatil zone between an ancient shoreline which formed on the Tafaritian substratum ca 6.7-5.7 cal. ka BP and the present one: (i) very extensive sand flats and (ii) linear relief features, both covered by a thin veneer of anthropogenic Anadara senilis shell-middens. They developed under a stable sea-level regime. The sand flats expanded at variable rates throughout the period. The linear relief features represent beach barriers and coastal dunes which can be dated archaeologically thanks to the superimposed shell-middens, supplemented by 14C dating. Two series of linear sedimentary units are identified. First, a complex north-south system of dunes and hook-ended sand barriers developed from 4.8 to 4.1 cal. ka BP and, secondly, two regular and linear beach barriers developed between 3.7 and 3.3 cal. ka BP. Their morphological characteristics suggest that they were generated through littoral drift processes. Directional changes observed between the first and the second groups demonstrate that the wave refraction pattern was dramatically modified after the closure of the strait between the former Iwik Island and the land. A comparison with the nearby Jerf el Oustani coastal area in the Late Holocene shows that both sites shared similarities in depositional patterns but also differences in the chronology of the sedimentary units. Processes involved in the development of the linear units are indicative of the enhancement of both sand influx and longshore drift due to climatic change.

  3. Carbon Dioxide Emissions from the Littoral Zone of a Chinese Reservoir, and a Comparison with Other Greenhouse Gases

    Science.gov (United States)

    Yang, Meng

    2017-04-01

    The continuous increase in the number of reservoirs in countries like China, India and Brazil has raised important questions about the environmental impact of their greenhouse gases emissions. In particular, the littoral zone may be a hotspot for production of greenhouse gases. We investigated the spatiotemporal variation of CO2 flux at the littoral zone of a Chinese reservoir along a wet-to-dry transect from permanent flooded land, seasonal flooded land to non-flooded dry land, using the static dark chamber technique. The mean total respiration was 346 mg m-2 h-1 (52% of which was contributed by shoots) and the rate varied significantly among water levels, months and time of day. We developed a statistical model which shows that temperature and biomass explain 76% of the variation. Flooding could play a positive role in carbon balance if water recession occurs at the time when carbon gains associated with plant growth overcomes the carbon loss of ecosystem. The overall carbon balance was analysed using cumulative greenhouse gases fluxes and biomass, bringing the data of the present study alongside our published data of CH4 and N2O flux which had been investigated simultaneously. CO2 and CH4 emissions correlated significantly under flooding, while N2O did not show significant correlations with CO2 or CH4 irrespective of whether the land was flooded or not. For the growing season, 11.6 g C m-2 was absorbed by the littoral zone. Taking CH4 and N2O into the calculation showed that permanently flooded sites were a source of greenhouse gases, rather than a sink. We emphasise the importance of taking into account all three gases when evaluating the greenhouse gas budgets of wetland ecosystems.

  4. Long-term trends in the structure of eastern Adriatic littoral fish assemblages: Consequences for fisheries management

    Science.gov (United States)

    Stagličić, N.; Matić-Skoko, S.; Pallaoro, A.; Grgičević, R.; Kraljević, M.; Tutman, P.; Dragičević, B.; Dulčić, J.

    2011-09-01

    Long-term interannual changes in abundance, biomass, diversity and structure of littoral fish assemblages were examined between 1993 and 2009 by experimental trammel net fishing up to six times per year, within the warm period - May to September, at multiple areas along the eastern Adriatic coast with the aim of testing for the consistency of patterns of change across a large spatial scale (˜600 km). The results revealed spatially consistent increasing trends of total fish abundance and biomass growing at an average rate of 15 and 14% per year, respectively. Of the diversity indices analysed, the same pattern of variability was observed for Shannon diversity, while Pielou evenness and average taxonomic distinctness measures Δ ∗ and Δ + showed spatial variability with no obvious temporal trends. Multivariate fish assemblage structure underwent a directional change displaying a similar pattern through time for all the areas. The structural change in fish assemblages generally involved most of the species present in trammel net catches. A large pool of fish species responsible for producing the temporal pattern of assemblage change was relatively different in each of the areas reflecting a large geographic range covered by the study. An analysis of 4 fish species ( Symphodus tinca, Pagellus erythrinus, Mullus surmuletus, Scorpaena porcus) common to each of the study areas as the ones driving the temporal change indicated that there were clear increasing trends of their mean catches across the years at all the study areas. A common pattern among time trajectories across the spatial scale studied implies that the factor affecting the littoral fish assemblages is not localised but regional in nature. As an underlying factor having the potential to induce such widespread and consistent improvements in littoral fish assemblages, a more restrictive artisanal fishery management that has progressively been put in place during the study period, is suggested and discussed.

  5. Draft genome of Elstera litoralis, a freshwater epilithic biofilm associated bacterium from littoral zone of Lake Constance.

    Science.gov (United States)

    Rahalkar, Monali C; Pore, Soham; Arora, Preeti; Pandit, Pranitha; Kapse, Neelam; Bahulikar, Rahul; Schink, Bernhard; Dhakephalkar, Prashant K

    2015-12-01

    Elstera litoralis, is a Rhodospirillaceae member which was isolated from the littoral zone of Lake Constance from a stone biofilm using diatom extracellular polymeric substances (EPS) as C source. We present here the draft genome of E. litoralis which has a genome size of 3.83 Mb and 61.2% G+C content. Genome analysis indicated utilization of multiple C substrates explaining its heterotrophic lifestyle as a bacterium present in natural biofilms. Further comparative genome analysis of Elstera with other members of Rhodospirillaceae would be helpful to understand the evolutionary relationships and divergence of hydrobacteria from terrabacteria. Copyright © 2015 Elsevier B.V. All rights reserved.

  6. The littoral benthon community of Lake Orta after liming: a comparison between summer 1993 and summer 1998

    Directory of Open Access Journals (Sweden)

    Marina TESAURO

    2001-08-01

    Full Text Available At different times in recent years (before, during and after liming we have studied the littoral macrobenthonic community in Lake Orta, and, for comparison, in Lake Mergozzo (an unpolluted lake. In this paper we compare the situations after liming in summer 1993 and in summer 1998. We found no clear difference between the summer samples in 1993 and 1998 for each site; only seasonal fluctuations were in evidence, in particular in the sites of Gozzano and Pella and in Lake Mergozzo. The two lakes, however, still present marked differences in the composition of their macrobentonic communities.

  7. Male meiosis in Crustacea: synapsis, recombination, epigenetics and fertility in Daphnia magna.

    Science.gov (United States)

    Gómez, Rocío; Van Damme, Kay; Gosálvez, Jaime; Morán, Eugenio Sánchez; Colbourne, John K

    2016-09-01

    We present the first detailed cytological study of male meiosis in Daphnia (Crustacea: Branchiopoda: Cladocera)-an aquatic microcrustacean with a cyclical parthenogenetic life cycle. Using immunostaining of the testes in Daphnia magna for baseline knowledge, we characterized the different stages of meiotic division and spermiogenesis in relation to the distribution of proteins involved in synapsis, early recombination events and sister chromatid cohesion. We also studied post-translational histone modifications in male spermatocytes, in relation to the dynamic chromatin progression of meiosis. Finally, we applied a DNA fragmentation test to measure sperm quality of D. magna, with respect to levels of inbreeding. As a proxy for fertility, this technique may be used to assess the reproductive health of a sentinel species of aquatic ecosystems. Daphnia proves to be a model species for comparative studies of meiosis that is poised to improve our understanding of the cytological basis of sexual and asexual reproduction.

  8. Reference values for feeding parameters of isopods (Porcellio scaber, Isopoda, Crustacea)

    Science.gov (United States)

    Drobne, Damjana; Drobne, Samo

    2014-01-01

    Abstract The advantage of using terrestrial isopods in toxicity studies is that a battery of parameters can be tested at different levels of biological complexity. Feeding parameters for example link organism level response to potential ecological consequences but a problem with using feeding parameters in toxicity tests with terrestrial isopods is their high variability. The aim of our study was to set benchmark values for feeding parameters for isopod Porcellio scaber (Isopoda, Crustacea) in laboratory-controlled experiments. In the work presented here, the daily feeding rate of the central 50% of the control population of Porcellio scaber and a correlation between feeding rate and isopod weight were set. Values outside these ranges need additional evaluation to increase the relevance of test outcomes. We suggest using benchmark values for feeding parameters as well as the coefficient of variation (a) to identify animals with altered feeding parameters with respect to controls, and (b) to assess the data quality in each experiment. PMID:25561844

  9. Reference values for feeding parameters of isopods (Porcellio scaber, Isopoda, Crustacea

    Directory of Open Access Journals (Sweden)

    Damjana Drobne

    2014-11-01

    Full Text Available The advantage of using terrestrial isopods in toxicity studies is that a battery of parameters can be tested at different levels of biological complexity. Feeding parameters for example link organism level response to potential ecological consequences but a problem with using feeding parameters in toxicity tests with terrestrial isopods is their high variability. The aim of our study was to set benchmark values for feeding parameters for isopod Porcellio scaber (Isopoda, Crustacea in laboratory-controlled experiments. In the work presented here, the daily feeding rate of the central 50% of the control population of P. scaber and a correlation between feeding rate and isopod weight were set. Values outside these ranges need additional evaluation to increase the relevance of test outcomes. We suggest using benchmark values for feeding parameters as well as the coefficient of variation (a to identify animals with altered feeding parameters with respect to controls, and (b to assess the data quality in each experiment.

  10. Phagocytosis mediates specificity in the immune defence of an invertebrate, the woodlouse Porcellio scaber (Crustacea: Isopoda).

    Science.gov (United States)

    Roth, Olivia; Kurtz, Joachim

    2009-11-01

    Specificity and memory are the hallmarks of the adaptive immune system of vertebrates. However, phenomena of specificity upon priming of immunity have recently been demonstrated also in invertebrates, which rely exclusively on innate immune defence. It has been suggested that phagocytosis might represent a core candidate for such specificity in invertebrates. We here developed in vitro phagocytosis measurements for different bacteria in the woodlouse Porcellio scaber (Crustacea: Isopoda). After immune priming with heat-killed bacteria, hemocytes showed increased phagocytosis of a previously encountered bacterial strain compared to other bacteria. These data support the role of phagocytosis in invertebrate immunological specificity and suggest a high degree of specificity that even enables to differentiate between strains of the same bacterial species.

  11. Littoral blasts: Pumice-water heat transfer and the conditions for steam explosions when pyroclastic flows enter the ocean

    Science.gov (United States)

    Dufek, J.; Manga, M.; Staedter, M.

    2007-11-01

    Steam explosions, or littoral blasts, generated when pyroclastic flows interact with seawater may be a common, although rarely documented, phenomena. The development of steam explosions rather than passive steam production is related to the rate of thermal energy transfer from hot pyroclasts to water. We conduct a series of laboratory experiments to quantify the heat transfer and steam production rates when hot pyroclasts encounter water. Hot pumice (>200°C) rapidly ingests water while remaining at the surface, producing measurable amounts of steam during the process. Approximately 10% of the thermal energy of the pumice particles is partitioned into the production of steam, and smaller particles have greater steam production rates. The laboratory experiments are used to develop a subgrid model for steam production that can be incorporated into a multiphase numerical framework. We use this model to study the critical steam production rates required to initiate explosive events. For conditions typical of many pyroclastic flows, particles smaller than ˜1-5 mm are required to initiate a littoral blast. A second set of two-dimensional numerical simulations is conducted to simulate the 12-13 July Soufrière Hills dome collapse event that reached the sea. The simulations predict that the focus of the blast is likely generated several hundred meters offshore and although the landward directed base surge is primarily dry (water vapor), the area immediately above the blast is steam-rich and may be a likely site for the production of accretionary lapilli.

  12. Environmental Geophysical Study of the Groundwater Mineralization in a Plot of the Cotonou Littoral Zone (South Benin

    Directory of Open Access Journals (Sweden)

    Yalo Nicaise

    2012-01-01

    Full Text Available Geophysical investigations comprising electrical resistivity and electromagnetic conductivities methods were deployed in a 350 m2 sector, strewn with 11 wells. Within the framework of an environmental study on a small scale in the south of Benin, the water conductivity of these wells was measured to determine in a direct way mineralization of the coastal water table in the littoral zone. This environmental study aimed to prospect by the geophysical methods the space extension of the water table mineralization obtained by direct measurements of water conductivity in the well and the depth of the fresh water/salted water interface in the coastal aquifer. Electromagnetic measurements of conductivities made it possible to chart a gradient of mineralization in the northwest direction. The logs of vertical electric soundings showed a deepening of the fresh water/salted water interface in the southern part and its rupture in the northern part. The electrical resistivities of the interface are sensitive to the degree of its mineralization. It has been observed that the geophysical methods in electrical and electromagnetic prospection are a great contribution to the environmental study of the water table mineralization in the littoral zone for a sustainable management of the water resource.

  13. [High-throughput analysis of bacterial community of transition zone in littoral wetland of Wuliangsuhai eutrophic lake].

    Science.gov (United States)

    Li, Jingyu; Du, Ruifang; Zhao, Ji

    2015-05-04

    We studied soil bacterial community composition, abundance and diversity of transition zone along eutrophic lakeside wetland sediments and soils. The total DNA was extracted according to the sediment DNA extraction. Then high-throughput pyrosequencing was used to detect soil bacterial community composition,abundance and diversity based-on 16S rRNA gene. Soil physicochemical properties were tested to analyze its effects on bacterial community according to standard methods. The soil bacterial community composition and relative abundance were very different across transition zone in littoral wetland. Bacteria groups mainly include Proteobacteria, Bacteroidetes, Chloroflexi, Actinobacteria, Planctomycetes and Gemmatimonadetes at phylum level. The diversity index of bacterial communities gradually increased according the land distribution, especially the phylum Proteobacteria and the genus Sulfurimonas. Correlation analysis indicated that the combination of total phosphorus, total water soluble salt and ammonium has the most significant effects on the whole bacterial community structure, and Mantel Test results indicated that the correlation was statistically significant (R = 0.8857, P = 0.037). The bacterial community structure of transition zone is quite different in littoral wetland of Wuliangsuhai eutrophic lake, where Sulfurimonas play potential important roles in biogeochemical cycles of sediments in Wuliangsuhai Lake.

  14. Developing Aerosol Algorithm over Ocean and a Littoral Zone Using the Next Generation Geo-Stationary Observations

    Science.gov (United States)

    Oo, M. M.; Holz, R.; Levy, R. C.; Miller, S. D.; Walther, A.; Heidinger, A.

    2016-12-01

    The advanced Himawari Imager (AHI) and the upcoming GOES-R are the next generation geo-stationary sensors with the capability of multi-spectral, high spatial and geo-stationary observation over southeast Asia (AHI) and United States (GOES-R). The long-term goal of this project is to develop an aerosol algorithm for the AHI and GOES-R that can be applied to the littoral regions where the surface reflectance can vary significantly and cannot be assumed dark. This new algorithm will be integrated into the NOAA's Clouds from AVHRR Extended (CLAVR-x) framework providing near real time processing capability. The foundation for the algorithm is the dark target approach, developed for NASA's Earth Observing System Moderate Resolution Imaging Spectroradiometer (MODIS) to retrieve aerosol properties. In this paper we will present our preliminary AOD retrievals from geo-stationary (AH) data over ocean and inter-compare with collocated MODIS and Visible Infrared Imaging Radiometer Suite (VIIRS) (Dark Target) retrievals and the Japanese Aerospace Exploration Agency (JAXA) AHI beta AOD retrieval. We will then present the design of the littoral aerosol algorithm with a focus on methods to separate the surface reflectance from the aerosol signal using the combined multispectral capability of AHI with the ability to characterize the temporal variability of a given FOV. Finally, we will demonstrate a case study of aerosol retrieval using this approach.

  15. The Application of Seismic Array Techniques to Image UXO-Contaminated Littoral Environments

    Science.gov (United States)

    Gritto, R.; Korneev, V.; Nihei, K.; Johnson, L.

    2004-12-01

    We investigate the application of seismic array techniques to increase the energy radiation and resolution of seismic waves in littoral areas to improve the success rate of detecting UXO in contaminated underwater sites. The investigation is carried out based on numerical modeling, including 2-D finite difference modeling and 3-D analytical solutions of the problem. In addition to various UXO orientations, we also modeled the presence of clutter in the subsurface. An array of 31 source and receiver elements was located floating in the water as well as sited on the seafloor, which allowed the comparison between single source-receiver combinations and beam-forming techniques. The numerical forward modeling involved noise-free and noisy data as well as interferences by free surface reflections (off the water-air interface), which produced the strongest phases on the seismograms. The inversion of the scattered seismic energy was performed using a 2-D eikonal solver (curved rays), which stacked and located the recorded amplitudes in space to determine the location of the UXO. The inversion also included the determination of the best fitting velocity model for the bay mud. The results of the 2-D modeling indicated that a single, horizontally oriented, UXO could be well detected as a function of depth and horizontal location. In the case of the source-receiver array being placed on the seafloor, the edges of the UXO were resolved indicating its horizontal extent, while the top of the UXO was correctly located. The cases of a second, vertically oriented, UXO and clutter located 0.1 m next to the first UXO, produced similar results. In each case the two objects produced slight interference in the backscattered seismic signal, yet the resolution of the seismic wave was still good enough to resolve the two objects from each other. The introduction of a rippled water-seafloor interface during the forward modeling didn't change the results for the case of a floating source

  16. Holocene beach buildup and coastal aeolian sand incursions off the Nile littoral cell

    Science.gov (United States)

    Roskin, Joel; Sivan, Dorit; Shtienberg, Gilad; Porat, Naomi; Bookman, Revital

    2017-04-01

    Israel's coastal plain is abundant with sand originating from the Nile littoral cell. The inland windblown loose sand has formed 3-6 km wide lobe-like sand and dune fields currently comprised of foredunes, linear and northeasterly facing transverse and parabolic dunes that are currently stabilized by vegetation. This study reviews the architecture and history of the these dune fields aiming to: (a) Date the timings of beach accretion, and sand and dune incursions. (b) Discriminate between natural and human-induced forcing factors of sand mobilization and stabilization in time and space. (c) Present a model of the dunescape development. (d) Assess scenarios of sand transport in the future charcaterized by intense human impact and climate change. Luminescence ages, radiocarbon dates and relative ages from previously published geological and archaeological reports, historical texts, together with new optically stimulated luminescence (OSL) ages and stratigraphic and sedimentological data are analyzed. The deposition, mobilizations and preservation of the sand bodies, initially induced by the decline in sea level rise at 6-4 ka, were later controlled by historic land-use intensity and modern land-use/negligence practices. At 6 ka, beach sand buildup rapidly started. Where aeolianite ridges bordered the coast, pulses of sand with biogenic carbonate grains unconformably draped the ridges and rapidly consolidated into a distinct sandy calcarenite unit. Further east, sand sheets and low dunes partly pedogenized following their incursion, but did not cement. The water retention capacities of the sand sheets enabled the establishment of a sand-stabilizing vegetation cover that probably became an attractive environment for fuel and grazing. The growing Hellenistic-Roman-Byzantine ( 2.4-1.3 ka) populations probably led to increased consumption and massive destruction of sand stabilizing vegetation, enabling sand erodibility and mobilization during winter storms. The sand

  17. Distribution of living larger benthic foraminifera in littoral environments of the United Arab Emirates

    Science.gov (United States)

    Fiorini, Flavia; Lokier, Stephen W.

    2015-04-01

    The distribution of larger benthic foraminifera in Recent littoral environment of the United Arab Emirates (Abu Dhabi and Western regions) was investigated with the aim of understanding the response of those foraminifera to an increase in water salinity. For this purpose, 100 sediment samples from nearshore shelf, beach-front, channel, lagoon, and intertidal environment were collected. Sampling was undertaken at a water depth shallower than 15 m in water with a temperature of 22 to 35˚C, a salinity ranging from 40 to 60‰ and a pH of 8. Samples were stained with rose Bengal at the moment of sample collection in order to identify living specimens. The most abundant epiphytic larger benthic foraminifera in the studied area were Peneroplis pertusus and P. planatus with less common Spirolina areatina, S. aciculate and Sorites marginalis. The living specimens of the above mentioned species with normal test growing were particularly abundant in the nearshore shelf and lagoonal samples collected on seaweed. Dead specimens were concentrated in the coarser sediments of the beach-front, probably transported from nearby environments. Shallow coastal ponds are located in the upper intertidal zone and have a maximum salinity of 60‰ and contain abundant detached seagrass. Samples collected from these ponds possess a living foraminifera assemblage dominated by Peneroplis pertusus and P. planatus. High percentages (up to 50% of the stained assemblage) of Peneroplis presented abnormality in test growth, such as the presence of multiple apertures with reduced size, deformation in the general shape of the test, irregular suture lines and abnormal coiling. The high percentage of abnormal tests reflects natural environmental stress mainly caused by high and variable salinity. The unique presence of living epiphytic species, suggests that epiphytic foraminifera may be transported into the pond together with seagrass and continued to live in the pond. This hypothesis is supported by

  18. Seasonal variations in pore water and sediment geochemistry of littoral lake sediments (Asylum Lake, MI, USA

    Directory of Open Access Journals (Sweden)

    Miller Douglas

    2006-12-01

    Full Text Available Abstract Background Seasonal changes in pore water and sediment redox geochemistry have been observed in many near-surface sediments. Such changes have the potential to strongly influence trace metal distribution and thus create seasonal fluctuations in metal mobility and bioavailability. Results Seasonal trends in pore water and sediment geochemistry are assessed in the upper 50 cm of littoral kettle lake sediments. Pore waters are always redox stratified, with the least compressed redox stratification observed during fall and the most compressed redox stratification observed during summer. A 2-step sequential sediment extraction yields much more Fe in the first step, targeted at amorphous Fe(III (hydroxides (AEF, then in the second step, which targets Fe(II monosulfides. Fe extracted in the second step is relatively invariant with depth or season. In contrast, AEF decreases with sediment depth, and is seasonally variable, in agreement with changes in redox stratification inferred from pore water profiles. A 5-step Tessier extraction scheme was used to assess metal association with operationally-defined exchangeable, carbonate, iron and manganese oxide (FMO, organic/sulfide and microwave-digestible residual fractions in cores collected during winter and spring. Distribution of metals in these two seasons is similar. Co, As, Cd, and U concentrations approach detection limits. Fe, Cu and Pb are mostly associated with the organics/sulfides fraction. Cr and Zn are mostly associated with FMO. Mn is primarily associated with carbonates, and Co is nearly equally distributed between the FMO and organics/sulfide fractions. Conclusion This study clearly demonstrates that near-surface lake sediment pore water redox stratification and associated solid phase geochemistry vary significantly with season. This has important ramifications for seasonal changes in the bioavailability and mobility of trace elements. Without rate measurements, it is not possible to

  19. Petroleum hydrocarbon assessment in the sediments of the northeastern Havana littoral, Cuba

    Energy Technology Data Exchange (ETDEWEB)

    Companioni Dams, Eloy Yordad; Nunez Clemente, Ana Catalina; Cora Medina, Miriam Odette [Laboratorio de Quimica Ambiental, Centro de Investigaciones del Petroleo, Habana (Cuba)]. E-mail: elocompa@yahoo.com; Gonzalez Brovo, Luis [Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear, Habana, (Cuba); Marbot Ramada, Rolando [Laboratorio de Quimica Analitica, Centro de Investigaciones del Petroleo, Habana (Cuba); Montes de Oca Porto, Rodny [Laboratorio Antidoping, Habana (Cuba); Rosabal Rodriguez, Maikel [Centro de Ingenieria y Manejo Ambiental de Bahias y Costas, Habana (Cuba); Diaz Diaz, Miguel angel [Laboratorio de Quimica Ambiental, Centro de Investigaciones del Petroleo, Habana (Cuba)

    2009-02-15

    As a part of a geochemical study, aliphatic and aromatic hydrocarbons were determined in surficial sediments, from a Cuban coastal zone located in the Northeastern Havana Littoral. Sediment samples were collected at 15 sites in this area, and then extracted and analyzed by gas chromatography with flame ionization and mass spectrometry detectors. Total concentration of both, aliphatic (AH) and aromatic (ArH) hydrocarbons, varied from 2.4 {+-} 0.2 to 105.1 {+-} 5.9 {mu}g/g (dry weight) and from 1.1 {+-} 0.2 to 38.4 {+-} 7.6 {mu}g/g (dry weight), respectively. The chromatography profile of AH was dominated by an unresolved complex mixture (UCM), and the presence of isoprenoid hydrocarbons, steranes and hopanes, indicated petroleum - related hydrocarbon inputs. The predominant concentration of phytoplanktonic molecular markers (pristane and nC17) in collected sediments, revealed the marine productivity in this sites. The anthropogenic contribution detected showed the impact of the petroleum exploration along this coastal area. [Spanish] Como parte de un estudio geoquimico se determinaron hidrocarburos alifaticos y aromaticos en sedimentos superficiales, de una zona costera situada en el Litoral Nordeste de La Habana. Las muestras de sedimento se colectaron en 15 estaciones de muestreo en esta area, y posteriormente se extrajeron y analizaron mediante cromatografia gaseosa con detectores de ionizacion a la llama y espectrometria de masas. Las concentraciones totales de hidrocarburos alifaticos (HA) e hidrocarburos aromaticos (HAr) variaron desde 2.4 {+-} 0.2 a 105.1 {+-} 5.9 {mu}g/g (peso eco) y desde 1.1 {+-} 0.2 a 38.4 {+-} 7.6 {mu}g/g (peso eco), respectivamente. El perfil cromatografico de los hidrocarburos alifaticos estuvo dominado por una mezcla compleja no resuelta (MCNR), y la presencia de hidrocarburos isoprenoides, esteranos y hopanos, indico el aporte de hidrocarburos derivados del petroleo. La concentracion predominante de marcadores moleculares

  20. Occurence of the Asian shrimp Palaemon macrodactylus in the Southern bight of the North Sea, with a key to the Palaemonidae of North-western Europe (Crustacea: Decapoda: Caridea)

    NARCIS (Netherlands)

    d'Udekem d'Azoc, C.; Faasse, M.; Dumoulin, E.; Blauwe, de H.

    2005-01-01

    Het voorkomen van de rugstreepsteurgarnaal Palaemon macrodactylus in de zuidelijke bocht van de Noordzee, met een determinatiesleutel tot de Palaemonidae van Noordwest-Europa (Crustacea: Decapoda: Caridea) In 1999 werd de rugstreepsteurgarnaal Palaemon macrodactylus Rathbun, 1902, een soort

  1. Short-term variability and long-term change in the composition of the littoral zone fish community in Spirit Lake, Iowa

    Science.gov (United States)

    Pierce, C.L.; Sexton, M.D.; Pelham, M.E.; Larscheid, J.G.

    2001-01-01

    We assessed short-term variability and long-term change in the composition of the littoral fish community in Spirit Lake, Iowa. Fish were sampled in several locations at night with large beach seines during spring, summer and fall of 1995-1998. Long-term changes were inferred from comparison with a similar study conducted over 70 y earlier in Spirit Lake. We found 26 species in the littoral zone. The number of species per sample ranged from 4 to 18, averaging 11.8. The average number of species per sample was higher at stations with greater vegetation density. A distinct seasonal pattern was evident in the number of species collected per sample in most years, increasing steadily from spring to fall. Patterns of variability within our 1995-1998 study period suggest that: (1) numerous samples are necessary to adequately characterize a littoral fish community, (2) sampling should be done when vegetation and young-of-year densities are highest and (3) sampling during a single year is inadequate to reveal the full community. The number of native species has declined by approximately 25% over the last 70 y. A coincident decline in littoral vegetation and associated habitat changes during the same period are likely causes of the long-term community change.

  2. The littoral environment of rocky shores as a border between the sea and the land and between the sea and the fresh water

    NARCIS (Netherlands)

    Hartog, den C.

    1968-01-01

    Many ecologists have occupied themselves with the problem of the littoral zonation and they still disagree among themselves about the delimitation of the zones and the factors which cause the zonation. In this paper the problem has been approached in two different ways. In the first place the

  3. New species of marine littoral mites (Acari: Oribatida) from Taiwan and India, with a key to the world's species of Fortuynia and notes on their distribution

    Digital Repository Service at National Institute of Oceanography (India)

    Bayartogtokh, B.; Chatterjee, T.; Chan, B.K.K.; Ingole, B.S.

    Species of the small oribatid mite genus Fortuynia (Ameronothroidea: Fortuyniidae) mostly inhabit marine littoral zones in the tropics and subtropics. In the present paper, we describe 2 new species, Fortuynia taiwanica sp. nov. and F...

  4. Embourgeoisement et effet littoral. Recompositions socio-spatiales à La Rochelle et à l’Île de Ré Embourgeoisement and the littoral effect. Socio-spatial recompositions in La Rochelle and the Île de Ré

    Directory of Open Access Journals (Sweden)

    Clotilde Buhot

    2009-05-01

    Full Text Available Cette contribution examine l’importance des fonctions littorales et urbaines dans la structuration socio-spatiale de La Rochelle et de l’Île de Ré (France. L’analyse des dynamiques foncières et immobilières permet de définir le rôle des résidences secondaires dans cette région touristique.This essay examines the importance of littoral and urban factors in the socio-spatial structuration of La Rochelle and the Île de Ré (France. The analysis of the dynamics of property and real estate allow the definition of the role of second homes in this tourist region.

  5. 'Life?': modernism and liminality in Douglas Livingstone’s A littoral zone

    Directory of Open Access Journals (Sweden)

    E. Terblanche

    2006-07-01

    Full Text Available In an attempt to find his place within nature in South Africa and in a global modern context, Douglas Livingstone returns strongly to modernist poetry in his 1991 volume A littoral zone. In contrast to his predecessors like Wallace Stevens in “The glass of water” and T.S. Eliot in The waste land, this volume at critical moments gets stuck in a liminal stage. Images and poems, and eventually the volume as a whole, despite the highlights they present, say that it no longer seems so possible to end up also within the postliminal stage, so as to complete a rite of passage. Yet modernist poems such as Stevens’s “The glass of water” have the ability to end up in postliminal affirmation through and beyond the liminal stage of the overall process. Here light becomes a thirsty lion that comes down to drink from the glass, with a resultant transcendence of the dualistic between-ness that characterises the liminal stage in the modernist poetic mode, while this further results in the incorporation of a deeper and refreshing, dynamic unity. Even more remarkable is that this poetic rite is not of a closing nature, but open, especially in the sense that it affirms all that is possible and greater than the individual ego or subject, this, while getting stuck within a liminal stage just short of the postliminal stage can be in the nature of closure, as Livingstone shows, for example, when he says in “Low tide at Station 20” that humanity is trapped in its inability to see the original power of unity with and within nature in order to live within it; and while humanity remains an ugly outgrowth on the gigantic spine of evolution. In provisional conclusion this article finds that it will be better to view Victor Turner’s 1979 celebration of what he terms the “liminoid” in the place of a “true liminality” critically. Although it is impossible to return to a collective catharsis in watching a play, one cannot feel too comfortable about

  6. A new methodology based on littoral community cartography dominated by macroalgae for the implementation of the European Water Framework Directive.

    Science.gov (United States)

    Ballesteros, Enric; Torras, Xavier; Pinedo, Susana; García, María; Mangialajo, Luisa; de Torres, Mariona

    2007-01-01

    Macroalgae is a biological key element for the assessment of the ecological status in coastal waters in the frame of the European Water Framework Directive (WFD, 2000/60/EC). Here we propose a methodology for monitoring water quality based on the cartography of littoral and upper-sublittoral rocky-shore communities (CARLIT, in short). With the use of spatial databases, GIS, and available information about the value of rocky-shore communities as indicators of water quality, it is possible to obtain an environmental quality index representative of the ecological status of rocky coasts. This index, which completely fulfils the requirements of the WFD, is expressed as a ratio between the observed values in the sector of shore that is being assessed and the expected value in a reference condition zone with the same substrate and coastal morphology (Ecological Quality Ratio, EQR). The application of this index to the coast of Catalonia (North-Western Mediterranean) is presented.

  7. Biogeographic patterns of Chilean littoral fishes Patrones biogeográficos de los peces litorales de Chile

    Directory of Open Access Journals (Sweden)

    F. PATRICIO OJEDA

    2000-12-01

    Full Text Available In this study, we analyzed the biogeographic patterns of the Chilean littoral fish fauna, including latitudinal trends in teleost and chondrichthyan fish species richness, their distribution range patterns, and their level of endemism, both to the Chilean coast and the Southeastern Pacific. We determined the number and percentage of fish taxa within four different groups based on their biogeographic affinities. This was done, both for teleost and chondrichthyan fishes, at the species, genus and family level. In order to recognise the existence of biogeographic regions, we applied cluster and ordination analyses to the distribution data, using objective bootstrapping techniques at the three taxonomic levels used. We found that littoral fish diversity remains fairly constant along the coast down to around 40º S, declining south of this latitude. We detected two biogeographic regions along the Chilean coast, with a break between them at 40º S. These results lend support to previously recognized biogeographic provinces or faunistic units. These two biogeographic regions are a reflection of the mixed origin of the Chilean littoral ichthyofauna, consisting of northern warm-temperate fishes of subtropical origin and southern cold-temperate fishes of subantarctic origin. While the percentage of fishes endemic to the Chilean coast is not high (18%, a large percentage of teleost species inhabiting Chilean littoral waters are endemic to the Southeastern Pacific (44%. Dispersal and evolutionary history, rather that other factors, seem to explain the observed patterns of distribution of this particular fish fauna. This study represents a necessary first step towards understanding the biogeography of Southeastern Pacific marine fishesEn este estudio, analizamos los patrones biogeográficos de los peces litorales chilenos, incluyendo las tendencias latitudinales en riqueza de especies de peces teleosteos y condrictios, sus rangos de distribución, y nivel de

  8. Du littoral à la haute mer :quelles recherches récentes en géographie ?

    Directory of Open Access Journals (Sweden)

    Lydie Goeldner-Gianella

    2012-02-01

    Full Text Available La littoralisation croissante du peuplement et des activités, de même que l’importance des phénomènes d’érosion ou de submersion côtières, amenés à s’intensifier avec le changement climatique, rendent les recherches sur la mer et le littoral de plus en plus nécessaires et socialement utiles. En effet, elles permettent de répondre à de multiples enjeux, qui sont autant défensifs et économiques qu’écologiques, sociaux ou patrimoniaux. Ces enjeux s’analysant conjointement, il paraît souhaitable ...

  9. Distribution and ecology of cyanobacteria in the rocky littoral of an english lake district water body, devoke water.

    Science.gov (United States)

    Pentecost, Allan

    2014-12-16

    Cyanobacteria were sampled along two vertical and two horizontal transects in the littoral of Devoke Water, English Lake District. Profiles of cyanobacterium diversity and abundance showed that both attained a maximum close to the water line, but declined rapidly 20-40 cm above it. The distribution of individual species with height together with species and site ordinations showed that several taxa occurred in well-defined zones. A narrow "black zone" in the supralittoral was colonised mainly by species of Calothrix, Dichothrix and Gloeocapsa with pigmented sheaths. There was no evidence of lateral variation of species around the lake, but the height of the black zone correlated positively with wind exposure. The flora of Devoke Water is that of a base-poor mountain lake with some elements of a lowland, more alkaline water-body.

  10. Application of a new integrated sediment quality assessment method to Huelva estuary and its littoral of influence (Southwestern Spain).

    Science.gov (United States)

    Rosado, Daniel; Usero, José; Morillo, José

    2015-09-15

    A new integrated sediment quality assessment method composed of several assays (particle size profile, total metal content, protease K extraction, total organic carbon, toxicity bioassay with Photobacterium phosphoreum and macrobenthic community alteration) that provides a single result, the environmental degradation index (EDI), has been developed. The new method was tested on the Huelva estuary (southwest of Spain), a highly polluted area where metals dissolved in the water of the Tinto and Odiel rivers precipitate after flowing through the Iberian Pyrite Belt, one of the largest metallogenic areas of massive sulphide deposits in the world. The proposed method satisfactorily was able to reflect different degrees of pollution on the environmental degradation index. Thus, EDI categorized littoral samples as slightly degraded and all the Tinto and some of the Odiel as very highly degraded, emphasizing the lower zone of the Tinto estuary as the most deeply degraded of the entire study area. Copyright © 2015 Elsevier Ltd. All rights reserved.

  11. Ecologia populacional, estratégias reprodutivas e uso de recursos por isópodos terrestres neotropicais (Crustacea, isopoda)

    OpenAIRE

    Aline Ferreira Quadros

    2009-01-01

    Os isópodos terrestres (Crustacea, Oniscidea) apresentam adaptações únicas à vida terrestre, tanto fisiológicas quanto morfológicas e comportamentais. Habitam uma grande variedade de ambientes e são facilmente capturados e mantidos em laboratório, constituindo assim um ótimo modelo para investigações que contribuam para um melhor entendimento da ecologia de solo. Apesar de sua grande importância para o funcionamento dos ecossistemas através da detritivoria e da posição chave que ocupam nas te...

  12. Distribution and spatial trends of PCBs in commercial scallops from Galician littoral (NW, Spain). Possible influence of biometric parameters.

    Science.gov (United States)

    Carro, N; García, I; Ignacio, M; Mouteira, A

    2012-04-01

    Levels and profiles of 10 individual congeners of polychlorinated biphenyls (PCBs) were studied in 3 species of commercial scallops (Pecten maximus, Chlamys varia, and Chlamys opercularis) from several Rías in Galician littoral (NW, Spain). ΣPCBs levels ranged from 2.21 to 41.0 ng/g wet weight for P. maximus, from 13.9 to 24.9 ng/g wet weight for C. varia, and from 1.58 to 24.3 ng/g wet weight for C. opercularis. The possible influence between biometric parameters (lipid content, condition index, and shell size) and PCBs levels were studied using statistical analysis (ANOVA). No relationship between biometric parameters could be established in the studied samples. Multivariate analysis showed there were differences in bioaccumulation of some PCBs congeners. Principal component analysis classifies clearly the 3 studied Rías (Ría de Ferrol, Ría de Arousa, and Ría de Vigo) taking into account PCBs levels found in the shellfish. We investigated levels and profiles of 10 congeners of PCBs in 3 commercial scallop species from the Galician littoral zone. The influence of 3 biometric parameters on polychlorinated biphenyls (PCBs) levels was also studied in order to assess results from the monitoring programs of production areas. According to PCBs levels, geographical differences were observed in commercial scallops from the 3 studied estuarine bays (Ría de Ferrol, Ría de Arousa, and Ría de Vigo). © 2012 Institute of Food Technologists®

  13. Spatial distribution of archaeal and bacterial ammonia oxidizers in the littoral buffer zone of a nitrogen-rich lake.

    Science.gov (United States)

    Wang, Yu; Zhu, Guibing; Ye, Lei; Feng, Xiaojuan; Op den Camp, Huub J M; Yin, Chengqing

    2012-01-01

    The spatial distribution and diversity of archaeal and bacterial ammonia oxidizers (AOA and AOB) were evaluated targeting amoA genes in the gradient of a littoral buffer zone which has been identified as a hot spot for N cycling. Here we found high spatial heterogeneity in the nitrification rate and abundance of ammonia oxidizers in the five sampling sites. The bacterial amoA gene was numerically dominant in most of the surface soil but decreased dramatically in deep layers. Higher nitrification potentials were detected in two sites near the land/water interface at 4.4-6.1 microg NO(2-)-N/(g dry weight soil x hr), while only 1.0-1.7 microg NO(2-)-N/(g dry weight soil x hr) was measured at other sites. The potential nitrification rates were proportional to the amoA gene abundance for AOB, but with no significant correlation with AOA. The NH4+ concentration was the most determinative parameter for the abundance of AOB and potential nitrification rates in this study. Higher richness in the surface layer was found in the analysis of biodiversity. Phylogenetic analysis revealed that most of the bacterial amoA sequences in surface soil were affiliated with the genus of Nitrosopira while the archaeal sequences were almost equally affiliated with Candidatus 'Nitrososphaera gargensis' and Candidatus 'Nitrosocaldus yellowstonii'. The spatial distribution of AOA and AOB indicated that bacteria may play a more important role in nitrification in the littoral buffer zone of a N-rich lake.

  14. Number, biomass, and distribution of fish species in the littoral zone of the upper St. Lawrence River-Quantitative electrofishing, Johnstown Bay, June to October 1995: an assessment by type of habitat

    National Research Council Canada - National Science Library

    Casselman, J.M; Grant, R.E

    1998-01-01

    ..., and distribution of littoral-zone fishes in a shallow environment (< 3m) in the upper St. Lawrence River; 2) examine the occurrence of various species in relation to locally different types of microhabitat, including the recent rock infill...

  15. Long-term fluctuations in population of Semibalanus balanoides (L. (Crustacea in the estuarine zone of the Kola Bay

    Directory of Open Access Journals (Sweden)

    Svitina V. S.

    2017-06-01

    Full Text Available The intertidal population of the barnacles Semibalanus balanoides has been explored in the estuarine zone of the Tuloma River at the end of the Kola Bay for the first time. Barnacles S. balanoides are typical species for the littoral zone of the northern seas, they populate both the high and low salinity areas along the coast of the Barents Sea. The ecology and distribution of barnacle population in estuarine intertidal zones of the Barents Sea are not studied previously, and under the critical salinity conditions of any estuary, in particular. The investigation have been carried out on the littoral of the western (left shore of the southern tribe of the Kola Bay – the estuary section from the Tuloma bridge to the Cape Elovy. The studied site is a sandy-boulder beach with stony bars, its length is about 1 150 m, the area is about 126 500 m2. Counting the number of S. balanoides in clusters has been performed on site (without removal of the copepods from the population by the standard method for intertidal sampling. Simultaneously with the defining the number of barnacles for the period 2003–2014, the measurements of salinity and temperature of water and air have been made. The peculiarity of the estuarine barnacle population is their complete absence in the upper horizon of the littoral, and in the middle and the lower horizons they are found only within the channels of the littoral streams (3–20 specimens in the sample. For the first time the abundance and biomass of barnacles S. balanoides in this estuarine population has been determined, and the causes of their narrow-local distribution on the estuary littoral of the Tuloma River have been revealed. The main ecological factors determining the abundance and specific distribution of barnacles under the conditions of estuarine littoral have been established. The regular increase in the density of adult S. balanoides settlements along the gradient of water salinity from the Tuloma River to

  16. Species diversity and phylogeographical affinities of the Branchiopoda (Crustacea) of Churchill, Manitoba, Canada.

    Science.gov (United States)

    Jeffery, Nicholas W; Elías-Gutiérrez, Manuel; Adamowicz, Sarah J

    2011-01-01

    The region of Churchill, Manitoba, contains a wide variety of habitats representative of both the boreal forest and arctic tundra and has been used as a model site for biodiversity studies for nearly seven decades within Canada. Much previous work has been done in Churchill to study the Daphnia pulex species complex in particular, but no study has completed a wide-scale survey on the crustacean species that inhabit Churchill's aquatic ecosystems using molecular markers. We have employed DNA barcoding to study the diversity of the Branchiopoda (Crustacea) in a wide variety of freshwater habitats and to determine the likely origins of the Churchill fauna following the last glaciation. The standard animal barcode marker (COI) was sequenced for 327 specimens, and a 3% divergence threshold was used to delineate potential species. We found 42 provisional and valid branchiopod species from this survey alone, including several cryptic lineages, in comparison with the 25 previously recorded from previous ecological works. Using published sequence data, we explored the phylogeographic affinities of Churchill's branchiopods, finding that the Churchill fauna apparently originated from all directions from multiple glacial refugia (including southern, Beringian, and high arctic regions). Overall, these microcrustaceans are very diverse in Churchill and contain multiple species complexes. The present study introduces among the first sequences for some understudied genera, for which further work is required to delineate species boundaries and develop a more complete understanding of branchiopod diversity over a larger spatial scale.

  17. Paleocene decapod Crustacea from northeastern Mexico: Additions to biostratigraphy and diversity

    Science.gov (United States)

    Martínez-Díaz, José Luis; Aguillón-Martínez, Martha Carolina; Luque, Javier; Vega, Francisco J.

    2017-03-01

    New decapod specimens from mid-Paleocene shallow marine deposits of NE Mexico represents an important addition to the diversity, paleobiogeography and evolution of the Crustacea record. In this work, we describe additions to the decapod assemblage from the Paleocene (Selandian) Rancho Nuevo Formation (Difunta Group, Parras Basin, Coahuila). Due to the evident size differences with other decapod assemblages, we compare the new assemblage with those from the Lower Paleocene (Danian) Mexia Clay Member of the Wills Point Formation, Texas, and the Lower Eocene (Ypresian) El Bosque Formation in Chiapas. Species reported from the mid-Paleocene (Selandian) assemblage of the Porters Creek Formation (Alabama), are correlatable to the decapod species from NE Mexico in age, size and systematic composition. The erymid lobster Enoploclytia gardnerae (Rathbun, 1935) is represented by several carapaces and chelae remains. One isolated palm of Callianassidae is included. Numerous carapaces of Linuparus wilcoxensis Rathbun, 1935 are described, representing the most abundant lobster. A new record for the raninid Notopoides sp., and presence of Quasilaeviranina sp. cf. arzignagnensis and Quasilaeviranina ovalis are here reported. New raninids, Claudioranina latacantha sp. nov. and Claudioranina sp. (Cyrtorhininae) are also part of this assemblage. Paraverrucoides alabamensis (Rathbun, 1935), and Tehuacana americana (Rathbun, 1935) are represented by several carapaces exhibiting intraspecific morphological variation. Different sizes among the Early and Middle Paleocene and Early Eocene decapod populations suggests a possible effect of variation in seawater temperatures and/or a Lilliput effect after the K/Pg event.

  18. Toxicity of imidacloprid to the terrestrial isopod Porcellio scaber (Isopoda, Crustacea).

    Science.gov (United States)

    Drobne, Damjana; Blazic, Mateja; Van Gestel, Cornelis A M; Leser, Vladka; Zidar, Primoz; Jemec, Anita; Trebse, Polonca

    2008-04-01

    Imidacloprid is a neonicotinoid insecticide with neurotoxic action that, as a possible alternative for commonly used organophosphorus pesticides, has gained registration in about 120 countries for use in over 140 agricultural crops. Only few data are available on its toxicity for soil invertebrates. We therefore assessed the effects of imidacloprid on survival, weight gain, feeding rate, total protein content, glutathione S-transferase activity (GST), and digestive gland epithelial thickness in juveniles and adults of the terrestrial isopod Porcellio scaber. After two weeks of feeding on imidacloprid-dosed food, weight gain (NOEC 5 microg/g dry food) and feeding rate (NOEC 10 microg/g) in juveniles, and feeding rate (NOECPorcellio scaber, Isopoda, Crustacea). Chemosphere 64, 1745-1752]. At actual environmental concentrations, diazinon poses a higher risk to P. scaber. Due to its increasing use in crop protection and higher persistence in soil, imidacloprid might however, be potentially more dangerous after long-term application. We conclude that toxicity testing with P. scaber provides relevant, repeatable, reproducible and comparable toxicity data that is useful for the risk assessment of pesticides in the terrestrial environment.

  19. Photon activation analysis of trace elements in several kinds of invertebrate animals. 1. Arthropoda crustacea

    Energy Technology Data Exchange (ETDEWEB)

    Fukushima, Michiko; Tamate, Hidetoshi [Ishinomaki Senshu Univ., Miyagi (Japan)

    1998-09-01

    Quantitative analysis of trace elements was made for marine mollusca by light quantum activation method. Crustacea which is likely to be well reflecting the environment of ocean floor was used as the subjects. Various kinds of these animals including Carcinus Portunus. Palinurus, Panulirus, Squilla etc. were collected from the sea off Japan to determine the concentrations of 15 kinds of elements in the gills, muscles, head/thorax region and viceraneous organs. The concentration of As was found markedly high in either of gills, muscles or viceraneous organs of Palinurus taken from the sea near Okinawa. It was found that there are no difference in the concentrations of As, Fe, Mn and Pb among the species studied and Fe, Mn and Pb were detected at high levels in the gills of Carcinus, whereas the Fe and Mn concentrations in the gills of Palinurus were considerably lower than other species tested. Thus, the element concentration was different among the regions studied and also species. (M.N.)

  20. The developmental trend of labrum and median eyes of Orsten-type preserved Phosphatocopina (Crustacea)

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    The Phosphatocopina (Crustacea,Arthropoda) is an important group of ’Orsten-type’ preserved fossils.It is resolved as the sister-group of Eucrustacea.Here we study the labrum,the median eyes,and the inner lamella of Phosphatocopina based on the selected specimens respectively from western Hunan,South China,and Sweden.The labrum characters of different species exhibit interspecific difference.The ratio of labrum length/shield length is significant to the reconstruction of the ontogeny of phosphatocopines.The labrum characters should be introduced to the diagnosis of Phosphatocopina.In the earliest growth stage,the median eyes were inconspicuous,almost as flat as the other area of the hypstome.However,with the growth of the individuals they became conspicuous.There were two obviously concave structures on the ventral side of the hypostome in later stages,which were the positions where the median eyes should have been located.In addition,the two modes of preservation of the inner lamella,i.e.,that of shrinking and that of bulging up,are interpreted as the preservational artifact herein.

  1. Benthic Crustacea from tropical and temperate reef locations: differences in assemblages and their relationship with habitat structure

    Science.gov (United States)

    Kramer, Michael J.; Bellwood, David R.; Taylor, Richard B.; Bellwood, Orpha

    2017-09-01

    Tropical and temperate marine habitats have long been recognised as fundamentally different system, yet comparative studies are rare, particularly for small organisms such as Crustacea. This study investigates the ecological attributes (abundance, biomass and estimated productivity) of benthic Crustacea in selected microhabitats from a tropical and a temperate location, revealing marked differences in the crustacean assemblages. In general, microhabitats from the tropical location (dead coral, the epilithic algal matrix [algal turfs] and sand) supported high abundances of small individuals (mean length = 0.53 mm vs. 0.96 mm in temperate microhabitats), while temperate microhabitats (the brown seaweed Carpophyllum sp., coralline turf and sand) had substantially greater biomasses of crustaceans and higher estimated productivity rates. In both locations, the most important microhabitats for crustaceans (per unit area) were complex structures: tropical dead coral and temperate Carpophyllum sp. It appears that the differences between microhabitats are largely driven by the size and relative abundance of key crustacean groups. Temperate microhabitats have a higher proportion of relatively large Peracarida (Amphipoda and Isopoda), whereas tropical microhabitats are dominated by small detrital- and microalgal-feeding crustaceans (harpacticoid copepods and ostracods). These differences highlight the vulnerability of tropical and temperate systems to the loss of complex benthic structures and their associated crustacean assemblages.

  2. Structure and Ultrastructure of the Endodermal Region of the Alimentary Tract in the Freshwater Shrimp Neocaridina heteropoda (Crustacea, Malacostraca.

    Directory of Open Access Journals (Sweden)

    Lidia Sonakowska

    Full Text Available The freshwater shrimp Neocaridina heteropoda (Crustacea, Malacostraca, Decapoda originates from Asia and is one of the species that is widely available all over the world because it is the most popular shrimp that is bred in aquaria. The structure and the ultrastructure of the midgut have been described using X-ray microtomography, transmission electron microscopy, light and fluorescence microscopes. The endodermal region of the alimentary system in N. heteropoda consists of an intestine and a hepatopancreas. No differences were observed in the structure and ultrastructure of males and females of the shrimp that were examined. The intestine is a tube-shaped organ and the hepatopancreas is composed of two large diverticles that are divided into the blind-end tubules. Hepatopancreatic tubules have three distinct zones - proximal, medial and distal. Among the epithelial cells of the intestine, two types of cells were distinguished - D and E-cells, while three types of cells were observed in the epithelium of the hepatopancreas - F, B and E-cells. Our studies showed that the regionalization in the activity of cells occurs along the length of the hepatopancreatic tubules. The role and ultrastructure of all types of epithelial cells are discussed, with the special emphasis on the function of the E-cells, which are the midgut regenerative cells. Additionally, we present the first report on the existence of an intercellular junction that is connected with the E-cells of Crustacea.

  3. Structure and Ultrastructure of the Endodermal Region of the Alimentary Tract in the Freshwater Shrimp Neocaridina heteropoda (Crustacea, Malacostraca).

    Science.gov (United States)

    Sonakowska, Lidia; Włodarczyk, Agnieszka; Poprawa, Izabela; Binkowski, Marcin; Śróbka, Joanna; Kamińska, Karolina; Kszuk-Jendrysik, Michalina; Chajec, Łukasz; Zajusz, Bartłomiej; Rost-Roszkowska, Magdalena Maria

    2015-01-01

    The freshwater shrimp Neocaridina heteropoda (Crustacea, Malacostraca, Decapoda) originates from Asia and is one of the species that is widely available all over the world because it is the most popular shrimp that is bred in aquaria. The structure and the ultrastructure of the midgut have been described using X-ray microtomography, transmission electron microscopy, light and fluorescence microscopes. The endodermal region of the alimentary system in N. heteropoda consists of an intestine and a hepatopancreas. No differences were observed in the structure and ultrastructure of males and females of the shrimp that were examined. The intestine is a tube-shaped organ and the hepatopancreas is composed of two large diverticles that are divided into the blind-end tubules. Hepatopancreatic tubules have three distinct zones - proximal, medial and distal. Among the epithelial cells of the intestine, two types of cells were distinguished - D and E-cells, while three types of cells were observed in the epithelium of the hepatopancreas - F, B and E-cells. Our studies showed that the regionalization in the activity of cells occurs along the length of the hepatopancreatic tubules. The role and ultrastructure of all types of epithelial cells are discussed, with the special emphasis on the function of the E-cells, which are the midgut regenerative cells. Additionally, we present the first report on the existence of an intercellular junction that is connected with the E-cells of Crustacea.

  4. AGIL/BN - Aide à la Gestion Intégrée du Littoral en Basse-Normandie - Bilan des travaux 2012

    OpenAIRE

    Le Gendre, Romain; Riou, Philippe

    2013-01-01

    Dans le cadre d’une convention multi partenariale, le Laboratoire Environnement Ressources s’est vu confier la maîtrise d’ouvrage du projet « AGIL BN ». Son objectif est de développer des outils et compétences permettant d’élaborer des aides à la prise de décision en matière d’aménagement et de gestion de l’environnement littoral en Basse-Normandie. Il comprend 2 grands volets : - développement d’un Système d’Information Géographique « environnement littoral », avec mise en ligne d’u...

  5. Multiple antibiotic resistance of heterotrophic bacteria in the littoral zone of Lake Shira as an indicator of human impact on the ecosystem.

    Science.gov (United States)

    Lobova, Tatiana I; Barkhatov, Yuri V; Salamatina, Ol'ga V; Popova, Lyudmila Yu

    2008-01-01

    Resistance to Ampicillin and Kanamycin displayed by heterotrophic bacteria isolated in Summer and in Spring from the littoral and the central parts of Lake Shira (a therapeutic lake in the Khakasia Republic, Russia) has been investigated. It has been found that in Summer, human and animal microflora featuring multiple antibiotic resistance (to Ampicillin and Kanamycin) predominates in all the studied stations of the littoral zone of the lake. In Spring, concentrations of bacteria featuring multiple antibiotic resistance decrease significantly and bacteria sensitive to antibiotics predominate in the lake. Emergence of multiple antibiotic resistance in bacteria of Lake Shira is caused by the input of allochthonous bacteria into the lake; this feature of heterotrophic bacteria of Lake Shira can be used to monitor the impact on the ecosystem made by health resorts.

  6. Phytoplankton and littoral epilithic diatoms in high mountain lakes of the Adamello-Brenta Regional Park (Trentino, Italy and their relation to trophic status and acidification risk

    Directory of Open Access Journals (Sweden)

    Monica TOLOTTI

    2001-08-01

    Full Text Available A survey of phytoplankton and littoral epilithic diatom communities was carried out on 16 high mountain lakes in the Adamello- Brenta Regional Park (NE Italy as part of a wider research project aimed to the limnological characterisation of the seldom-studied lakes in this Alpine Region. The regional study was supplemented by the analysis of seasonal variations in two representative lakes. The principal goals of this paper are 1 to identify the most important environmental variables regulating patterns in the species composition of both phytoplankton and littoral diatoms, 2 to evaluate whether these algal communities can be used to improve trophic classification and 3 whether they can facilitate monitoring of diffuse human impacts (e.g. airborne pollution on high altitude lakes. The relevance to monitoring is based on the acid sensitivity of all lakes studied, as indicated by the very low average alkalinity values (4-97 μeq l-1 recorded during the investigation period. Chlorophyll-a concentrations and phytoplankton biovolume recorded in the lakes were very low, with maxima in the deep-water layers and in late summer. Phytoplankton communities were dominated by flagellated algae (Chrysophyceae and Dinophyceae. Several coccal green algae were present, while planktonic diatoms were almost completely absent. Littoral diatom communities were dominated by alpine and acidophilous taxa (mainly belonging to the genera Achnanthes and Eunotia. Trophic classification based on phytoplankton and littoral diatoms, respectively, ascribed all lakes to the oligotrophic range. In both algal communities species indicative of acidified conditions were found. Multivariate analyses indicated that both the regional distribution and seasonal variation of phytoplankton are mainly driven by nutrient concentration. Diatoms are predominantly affected by geochemical characteristics including pH and mineralization level.

  7. Spatial and seasonal CH4 flux in the littoral zone of Miyun Reservoir near Beijing: the effects of water level and its fluctuation.

    Directory of Open Access Journals (Sweden)

    Meng Yang

    Full Text Available Wetlands, and especially their littoral zones, are considered to be CH4 emissions hotspots. The recent creation of reservoirs has caused a rapid increase in the area of the world's littoral zones. To investigate the effects of water depth and water level fluctuation on CH4 fluxes, and how these are coupled with vegetation and nutrients, we used static closed chamber and gas chromatography techniques to measure CH4 fluxes in the littoral zone of a large reservoir near Beijing, China, from November 2011 to October 2012. We found that CH4 flux decreased significantly along a transect from open water to dry land, from 3.1 mg m(-2 h(-1 at the deep water site to approximately 1.3 mg m(-2 h(-1 at the shallow water site, and less than 0.01 mg m(-2 h(-1 in the non-flooded area. Water level influenced CH4 flux by affecting soil properties including soil redox potential, soil carbon and nitrogen, and bulk density. The largest emission of all was from the seasonally flooded site after a flooding event (up to 21.1 mg m(-2 h(-1, which may have been caused by vegetation decomposition. Submerged sites had greater emissions, while the driest site had lower emissions. Immediately after the monthly measurements had been made, we removed the aboveground vegetation to enable an assessment of the gas transportation per unit of biomass. Removal of biomass decreased emissions by up to 53%. These results indicated the dominant effect of water depth on CH4 flux through effects of soil conditions, plant species composition and distribution. This study suggests that temporally flooded wetlands, including littoral zones, contribute significantly to the global CH4 burden. However, the current challenge is to capture their spatial extent and temporal variation in the fluxes.

  8. Spatial and seasonal CH4 flux in the littoral zone of Miyun Reservoir near Beijing: the effects of water level and its fluctuation.

    Science.gov (United States)

    Yang, Meng; Geng, Xuemeng; Grace, John; Lu, Cai; Zhu, Yi; Zhou, Yan; Lei, Guangchun

    2014-01-01

    Wetlands, and especially their littoral zones, are considered to be CH4 emissions hotspots. The recent creation of reservoirs has caused a rapid increase in the area of the world's littoral zones. To investigate the effects of water depth and water level fluctuation on CH4 fluxes, and how these are coupled with vegetation and nutrients, we used static closed chamber and gas chromatography techniques to measure CH4 fluxes in the littoral zone of a large reservoir near Beijing, China, from November 2011 to October 2012. We found that CH4 flux decreased significantly along a transect from open water to dry land, from 3.1 mg m(-2) h(-1) at the deep water site to approximately 1.3 mg m(-2) h(-1) at the shallow water site, and less than 0.01 mg m(-2) h(-1) in the non-flooded area. Water level influenced CH4 flux by affecting soil properties including soil redox potential, soil carbon and nitrogen, and bulk density. The largest emission of all was from the seasonally flooded site after a flooding event (up to 21.1 mg m(-2) h(-1)), which may have been caused by vegetation decomposition. Submerged sites had greater emissions, while the driest site had lower emissions. Immediately after the monthly measurements had been made, we removed the aboveground vegetation to enable an assessment of the gas transportation per unit of biomass. Removal of biomass decreased emissions by up to 53%. These results indicated the dominant effect of water depth on CH4 flux through effects of soil conditions, plant species composition and distribution. This study suggests that temporally flooded wetlands, including littoral zones, contribute significantly to the global CH4 burden. However, the current challenge is to capture their spatial extent and temporal variation in the fluxes.

  9. A list of Y-O-Y fish species found in the littoral shallows of the Neretva and Mala Neretva estuaries (Eastern Adriatic, Croatian coast

    Directory of Open Access Journals (Sweden)

    Vlasta BARTULOVIĆ

    2007-06-01

    Full Text Available Young-of-the-Year (Y-O-Y fish in the littoral shallows of the Neretva and Mala Neretva estuaries comprises a highly diverse fish community composed of 68 species representing 28 families. Gobiidae represent the most diverse family followed by Sparidae, Mugilidae and Soleidae. Moreover, more than 64.7% (44 species of the Y-O-Y species caught are among the species that form the main targets for commercial fisheries in the southern Adriatic.

  10. Une chaîne de traitement de l'information géographique au service de l'application de la loi Littoral

    Directory of Open Access Journals (Sweden)

    Patrick GUILLOPÉ

    1994-09-01

    Full Text Available L’application de la loi Littoral nécessitait une approche nouvelle de la part de l’État et la mise en œuvre d’outils nouveaux pour une gestion à long terme. L’apport de traitements automatiques de l’information géographique a été ainsi testé au CETE Normandie-Centre sur trois des grands principes posés par cette loi.

  11. Evidence for the zircon origin of cadmium anomalies in bottom sediments from the littoral zone of the northern part of Lake Ladoga

    Science.gov (United States)

    Ivanter, E. V.; Slukovskii, Z. I.; Dudakova, D. S.; Medvedev, A. S.; Svetov, S. A.

    2016-06-01

    The minor-element composition of bottom sediments from the littoral zone of the northern part of Lake Ladoga was studied. Close relationships between the anomalous Cd concentrations in lake sediments and Quaternary glacial formations on the territory of Karelia were shown. A negative correlation of Cd with other heavy metals and a positive correlation with Zr were observed. Most likely, Cd is an impurity in zircons from sandy and sandy loam sedimentary formations on the northern coastal area of Lake Ladoga.

  12. Effect of wave exposure dynamics on gut content mass and growth of young-of-the-year fishes in the littoral zone of lakes.

    Science.gov (United States)

    Stoll, S; Hofmann, H; Fischer, P

    2010-05-01

    Total length, body mass and gut content mass of young-of-the-year (YOY) perch Perca fluviatilis, dace Leuciscus leuciscus and bleak Alburnus alburnus were recorded over the summer of 2006 at three littoral sites at Upper Lake Constance. In P. fluviatilis and L. leuciscus, gut content mass correlated positively with wave-induced energy flux (E(F)) of the respective site and sampling day, while no correlation of gut content mass with E(F) was found in A. alburnus. It was assumed that benthivorous P. fluviatilis and L. leuciscus profited from suspended or uncovered benthic food items generated by wave action at sites and periods with high E(F). Alburnus alburnus, in contrast, feeding mainly on zooplankton in upper parts of the water column, could not profit from increased E(F). In P. fluviatilis, increased gut content mass during periods of high E(F) resulted in higher growth rates. For L. leuciscus, no real growth rates in local fish populations could be determined, as individuals were less sedentary, and when increased growth occurred at sites during the periods of high E(F), migration of fish levelled out the resulting size differences within few days. The results of this study show that dynamic habitat variables affect site profitability in the littoral zone of lakes, especially in benthivorous fishes. Therefore, dynamic habitat variables should be considered in addition to fixed habitat properties in analyses of habitat choice of fishes in the littoral zone of lakes.

  13. Validation of a side-scan sonar method for quantifying walleye spawning habitat availability in the littoral zone of northern Wisconsin Lakes

    Science.gov (United States)

    Richter, Jacob T.; Sloss, Brian L.; Isermann, Daniel A.

    2016-01-01

    Previous research has generally ignored the potential effects of spawning habitat availability and quality on recruitment of Walleye Sander vitreus, largely because information on spawning habitat is lacking for many lakes. Furthermore, traditional transect-based methods used to describe habitat are time and labor intensive. Our objectives were to determine if side-scan sonar could be used to accurately classify Walleye spawning habitat in the nearshore littoral zone and provide lakewide estimates of spawning habitat availability similar to estimates obtained from a transect–quadrat-based method. Based on assessments completed on 16 northern Wisconsin lakes, interpretation of side-scan sonar images resulted in correct identification of substrate size-class for 93% (177 of 191) of selected locations and all incorrect classifications were within ± 1 class of the correct substrate size-class. Gravel, cobble, and rubble substrates were incorrectly identified from side-scan images in only two instances (1% misclassification), suggesting that side-scan sonar can be used to accurately identify preferred Walleye spawning substrates. Additionally, we detected no significant differences in estimates of lakewide littoral zone substrate compositions estimated using side-scan sonar and a traditional transect–quadrat-based method. Our results indicate that side-scan sonar offers a practical, accurate, and efficient technique for assessing substrate composition and quantifying potential Walleye spawning habitat in the nearshore littoral zone of north temperate lakes.

  14. Ontogenetic loops in habitat use highlight the importance of littoral habitats for early life-stages of oceanic fishes in temperate waters

    Science.gov (United States)

    Polte, Patrick; Kotterba, Paul; Moll, Dorothee; von Nordheim, Lena

    2017-01-01

    General concepts of larval fish ecology in temperate oceans predominantly associate dispersal and survival to exogenous mechanisms such as passive drift along ocean currents. However, for tropical reef fish larvae and species in inland freshwater systems behavioural aspects of habitat selection are evidently important components of dispersal. This study is focused on larval Atlantic herring (Clupea harengus) distribution in a Baltic Sea retention area, free of lunar tides and directed current regimes, considered as a natural mesocosm. A Lorenz curve originally applied in socio-economics to describe demographic income distribution was adapted to a 20 year time-series of weekly larval herring distribution, revealing size-dependent spatial homogeneity. Additional quantitative sampling of distinct larval development stages across pelagic and littoral areas uncovered a loop in habitat use during larval ontogeny, revealing a key role of shallow littoral waters. With increasing rates of coastal change, our findings emphasize the importance of the littoral zone when considering reproduction of pelagic, ocean-going fish species; highlighting a need for more sensitive management of regional coastal zones. PMID:28205543

  15. Ontogenetic loops in habitat use highlight the importance of littoral habitats for early life-stages of oceanic fishes in temperate waters

    Science.gov (United States)

    Polte, Patrick; Kotterba, Paul; Moll, Dorothee; von Nordheim, Lena

    2017-02-01

    General concepts of larval fish ecology in temperate oceans predominantly associate dispersal and survival to exogenous mechanisms such as passive drift along ocean currents. However, for tropical reef fish larvae and species in inland freshwater systems behavioural aspects of habitat selection are evidently important components of dispersal. This study is focused on larval Atlantic herring (Clupea harengus) distribution in a Baltic Sea retention area, free of lunar tides and directed current regimes, considered as a natural mesocosm. A Lorenz curve originally applied in socio-economics to describe demographic income distribution was adapted to a 20 year time-series of weekly larval herring distribution, revealing size-dependent spatial homogeneity. Additional quantitative sampling of distinct larval development stages across pelagic and littoral areas uncovered a loop in habitat use during larval ontogeny, revealing a key role of shallow littoral waters. With increasing rates of coastal change, our findings emphasize the importance of the littoral zone when considering reproduction of pelagic, ocean-going fish species; highlighting a need for more sensitive management of regional coastal zones.

  16. Morphodynamics of prograding beaches: A synthesis of seasonal- to century-scale observations of the Columbia River littoral cell

    Science.gov (United States)

    Ruggiero, Peter; Kaminsky, George; Gelfenbaum, Guy R.; Cohn, Nicholas

    2016-01-01

    Findings from nearly two decades of research focused on the Columbia River littoral cell (CRLC), a set of rapidly prograding coastal barriers and strand-plains in the U.S. Pacific Northwest, are synthesized to investigate the morphodynamics associated with prograding beaches. Due to a large sediment supply from the Columbia River, the CRLC is the only extensive stretch of shoreline on the U.S. west coast to have advanced significantly seaward during the late Holocene. Since the last Cascadia Subduction Zone (CSZ) earthquake in 1700, with associated co-seismic subsidence and tsunami, much of the CRLC has prograded hundreds of meters. However, the rates of progradation, and the processes most responsible for sediment accumulation, vary depending on time scale and the morphological unit in question. Remarkably, the 20th and early 21st century shoreline change rates were more than double the late prehistoric rates that include recovery from the last major CSZ event, most likely due to an increase in sediment supply resulting from inlet jetty construction. In some locations detailed beach morphology monitoring reveals that at interannual- to decadal-scale the upper shoreface aggraded about 2 cm/yr, subtidal sandbars migrated offshore and decayed while intertidal bars migrated onshore and welded to the shoreline, the shoreline prograded about 4 m/yr, and 1 to 2 new foredune ridges were generated. A detailed meso-scale sediment budget analysis in one location within the littoral cell shows that approximately 100 m3/m/yr accumulated between − 12 m (seaward limit of data) and + 9 m (crest of landward-most foredune). Gradients in alongshore sediment transport, net onshore-directed cross-shore sediment transport within the surf zone, and cross-shore feeding from a shoreface out of equilibrium with forcing conditions are each partially responsible for the significant rates of sediment supplied to the beaches and dunes of the CRLC during the observational period. Direct

  17. Crustacea: Branchiura

    African Journals Online (AJOL)

    1993-03-25

    Mar 25, 1993 ... Mid-sagittal section through male 3,6 mm tot a] length. AM anterior midgut ..... The cuticle-I ined hindgut is a straight tube, 0,8 mm in length in a 3,6-mm ..... organs. preoral spine and digestive organs, Acta Univ. Lund. 13: 1-33.

  18. Arthropoda. Crustacea

    NARCIS (Netherlands)

    Böhm, Joh.

    1909-01-01

    Die mehrfach unterbrochene Kette tertiärer und jüngerer vulkanischer Gesteine, welche Java der Länge nach durchzieht, wird nordwärts und südwärts sowie in den Lücken von tertiären und quartären Ablagerungen eingerahmt ¹). Kreideformation und hoch krystalline Schiefer treten ganz vereinzelt und auf w

  19. Lysosomal membrane stability in laboratory- and field-exposed terrestrial isopods Porcellio scaber (Isopoda, Crustacea).

    Science.gov (United States)

    Nolde, Natasa; Drobne, Damjana; Valant, Janez; Padovan, Ingrid; Horvat, Milena

    2006-08-01

    Two established methods for assessment of the cytotoxicity of contaminants, the lysosomal latency (LL) assay and the neutral red retention (NRR) assay, were successfully applied to in toto digestive gland tubes (hepatopancreas) of the terrestrial isopod Porcellio scaber (Isopoda, Crustacea). In vitro exposure of isolated gland tubes to copper was used as a positive control to determine the performance of the two methods. Lysosomal latency and the NRR assay were then used on in vivo (via food) laboratory-exposed animals and on field populations. Arbitrarily selected criteria for determination of the fitness of P. scaber were set on the basis of lysosomal membrane stability (LMS) as assessed with in toto digestive gland tubes. Decreased LMS was detected in animals from all polluted sites, but cytotoxicity data were not in agreement with concentrations of pollutants. Lysosomal membrane stability in the digestive gland tubes of animals from an environment in Idrija, Slovenia that was highly polluted with mercury (260 microg/g dry wt food and 1,600 microg/g dry wt soil) was less affected than LMS in laboratory animals fed with 5 and 50 microg Hg/g dry weight for 3 d. This probably indicates tolerance of P. scaber to mercury in the mercury-polluted environment and/or lower bioavailability of environmental mercury. In animals from the vicinity of a thermal power plant with environmental mercury concentrations three to four orders of magnitude lower than those in Idrija, LMS was severely affected. In general, the LL assay was more sensitive than the NRR assay. The LMS assay conducted on digestive gland tubes of terrestrial isopods is highly recommended for integrated biomarker studies.

  20. Reduction and methylation of mercury in the terrestrial isopod Porcellio scaber (Crustacea) and its environment.

    Science.gov (United States)

    Nolde, Natasa; Drobne, Damjana; Horvat, Milena; Jereb, Vesna

    2005-07-01

    Reduction and methylation of inorganic mercury in Porcellio scaber (Isopoda, Crustacea) and its environment were studied, using a purpose-built experimental setup where Hg cycling was followed using 203Hg2+ tracer in experiments without and with isopods. In experiment without isopods, daily reduction of 203Hg2+ to 203Hg0 under sterile and nonsterile conditions was measured for three weeks to assess the contribution of bacteria to this process. In experiments with isopods, daily release of 203Hg0 was measured for two weeks. Total mercury (T203Hg) and monomethylmercury (Me203Hg) in whole animals, gut, digestive glands (hepatopancreas), food (hazelnut leaves), and feces were measured to obtain the assimilation and distribution of mercury in the animals, to investigate the origin and fate of Me203Hg, and, finally, to assess the mass balance of mercury in the experimental system. Experiment without isopods showed the important role of bacteria in reduction of 203Hg2+ to 203Hg0, especially in the first day of the experiment. Experiments with isopods showed that formation of 203Hg0 depended on the 203Hg2+ concentration in the food. The contribution of the isopod's digestive flora in reduction of 203Hg2+ to 203Hg0 was negligible. Approximately 3% of T203Hg and 2% of Me203Hg consumed was assimilated by the animals. Methylation of 203Hg2+ occurred already in the leaves before they were consumed by the isopods. Assimilation of Me203Hg from the food surprisingly was low. Also, a loss of Me203Hg was noticed when comparing assimilated and excreted Me203Hg versus consumed Me203Hg. This may be explained by the assumption that demethylation of MeHg prevailed over methylation of Hg2+ in the animal's digestive system, leading to excretion of ingested mercury as Hg2+.

  1. Cell Death in the Epithelia of the Intestine and Hepatopancreas in Neocaridina heteropoda (Crustacea, Malacostraca.

    Directory of Open Access Journals (Sweden)

    Lidia Sonakowska

    Full Text Available The endodermal region of the digestive system in the freshwater shrimp Neocaridina heteropoda (Crustacea, Malacostraca consists of a tube-shaped intestine and large hepatopancreas, which is formed by numerous blind-ended tubules. The precise structure and ultrastructure of these regions were presented in our previous studies, while here we focused on the cell death processes and their effect on the functioning of the midgut. We used transmission electron microscopy, light and confocal microscopes to describe and detect cell death, while a quantitative assessment of cells with depolarized mitochondria helped us to establish whether there is the relationship between cell death and the inactivation of mitochondria. Three types of the cell death were observed in the intestine and hepatopancreas-apoptosis, necrosis and autophagy. No differences were observed in the course of these processes in males and females and or in the intestine and hepatopancreas of the shrimp that were examined. Our studies revealed that apoptosis, necrosis and autophagy only involves the fully developed cells of the midgut epithelium that have contact with the midgut lumen-D-cells in the intestine and B- and F-cells in hepatopancreas, while E-cells (midgut stem cells did not die. A distinct correlation between the accumulation of E-cells and the activation of apoptosis was detected in the anterior region of the intestine, while necrosis was an accidental process. Degenerating organelles, mainly mitochondria were neutralized and eventually, the activation of cell death was prevented in the entire epithelium due to autophagy. Therefore, we state that autophagy plays a role of the survival factor.

  2. Estimation of canine Leishmania infection prevalence in six cities of the Algerian littoral zone using a Bayesian approach.

    Directory of Open Access Journals (Sweden)

    Amel Adel

    Full Text Available A large-scale study on canine Leishmania infection (CanL was conducted in six localities along a west-east transect in the Algerian littoral zone (Tlemcen, Mostaganem, Tipaza, Boumerdes, Bejaia, Jijel and covering two sampling periods. In total 2,184 dogs were tested with an indirect fluorescent antibody test (IFAT and a direct agglutination test (DAT. Combined multiple-testing and several statistical methods were compared to estimate the CanL true prevalence and tests characteristics (sensitivity and specificity. The Bayesian full model showed the best fit and yielded prevalence estimates between 11% (Mostaganem, first period and 38% (Bejaia, second period. Sensitivity of IFAT varied (in function of locality between 86% and 88% while its specificity varied between 65% and 87%. DAT was less sensitive than IFAT but showed a higher specificity (between 80% and 95% in function of locality or/and season. A general increasing trend of the CanL prevalence was noted from west to east. A concordance between the present results and the incidence of human cases of visceral leishmaniasis was observed, where also a maximum was recorded for Bejaia. The results of the present study highlight the dangers when using IFAT as a gold standard.

  3. Trématodes parasites de poissons marins du littoral de Rio de Janeiro, Brésil

    Directory of Open Access Journals (Sweden)

    Martine Wallet

    1987-03-01

    Full Text Available Les Trématodes de 35 espèces de poissons marins, d'importance commerciale, collectés dans le littoral de Rio de Janeiro, ont été étudiés. Dix-sept espèces de Trématodes appartenant à 13 familles ont été recensées. Quatre de ces espèces sont référés pour la première fois au Brésil: Diphtherostomum americanum, Diplomonorchis floridensis, Pancreadium otagoensis et Neomegasolena chaetodipteri, neuf dans de nouveaux hôtes: D. americanum, Diplangus paxillus, Hurleytrema shorti, Lecithochirium microstomum, Morascus filiformis, Neolebouria multilobatus, P. otagoensis, Pleorchis mollis et Opechona bacillaris, une a été recontrée dans un hôte mentionné pour la première fois au Brésil: Vitellibaculum spinosum et cinq autres espècies sont déjà répertoriées: Acanthocollaritrema umbilicatum, Bucephalopsis calliocotyle, Bucephalus varicus, Parahemiurus merus et Tergestia pauca. Tergestia selenei est consideré synonyme de T. pauca. Les principales mesures sont données pour chaque espèce.

  4. Differences of the essential mineral element levels in the milk of Croatian Coldblood horse and Littoral-Dinaric donkey

    Directory of Open Access Journals (Sweden)

    Nina Bilandžić

    2014-03-01

    Full Text Available The concentrations of essential elements in the milk of Croatian Coldblood mares and Littoral- Dinaric donkey were measured. The mean element contents in horse milk were (mg/kg: Ca 687.1, Mg 72.1, K 637.7, Na 143.5, Cu 0.126, Fe 0.235, Se 0.01, Zn 2.06, Mn<0.01. In donkey milk, the mean element contents were (mg/kg: Ca 815.4, Mg 80.8, K 887.7, Na 217.6, Cu 0.027, Fe 0.196, Zn 2.36, Mn 0.016. In horse milk, moderate correlations were found between the elements: Ca-K, Mg-Se, Mg-K, Mg-Cu, Se-Cu, Se-Fe, Mn-K. Strong correlations were found among elements in donkey milk: Ca-Na, Ca-K, Ca-Cu, K-Na, K-Cu, Cu-Mn. Significant differences between Na, K and Cu concentrations were obtained between the two species. Other elements concentrations were similar in both species.

  5. Occurrence of Clinical and Sub-Clinical Mastitis in Dairy Herds in the West Littoral Region in Uruguay

    Directory of Open Access Journals (Sweden)

    Rivero R

    2002-12-01

    Full Text Available Twenty-nine dairy farms were selected to determine the incidence of clinical mastitis, prevalence of sub-clinical mastitis and bacterial aetiology in the West Littoral Region of Uruguay. In samples taken by the owner and frozen at -20°C during a week the incidence rate of clinical mastitis was determined as 1.2 cases per 100 cow-months at risk. Staphylococcus aureus was the most common isolated pathogen in 37.5% of 40 milk samples from clinical cases obtained in 1 month. No bacteria grew in the 32.5% of the total samples. A sub-sample including 1077 dairy cows from randomly selected farms was used to determine the prevalence of sub-clinical mastitis. These samples were taken on one visit to each farm. The prevalence was 52.4% on a cow basis and 26.7% on an udder quarter basis. In 55.1% of the quarters of the selected animals with more than 300 000 cells/ml there was no growth. The isolated pathogens from sub-clinical cases and their relative frequencies were: Staphylococcus aureus 62.8%, Streptococcus agalactiae 11.3%, Enterococcus sp. 8%, coagulase-negative staphylococci 7.4%, Streptococus uberis 6.4%, Streptococcus dysgalactiae 1.8%, Escherichia coli 1.5% and Staphylococcus hyicus coagulase-positive 0.6%.

  6. An approximation to short-term evolution and sediment transport pathways along the littoral of Cadiz Bay (SW Spain)

    Science.gov (United States)

    Anfuso, G.; Benavente, J.; Del Río, L.; Gracia, F. J.

    2008-11-01

    This work presents the results of a beach-monitoring program carried out in the Bay of Cadiz (SW Spain), which consists of urban, natural and nourished beaches. In the present study, 24 topographic profiles have been monthly monitored during the 1996 1998 period, in order to draw the morphodynamic behavior of this coast and the general characterization of short-term coastal trends. This way, total volumetric budgets have been calculated for each beach profile in order to group beaches in different erosive/accreting sectors. Studied beaches recorded both erosion and accretion: the greatest accretionary trends have been observed at Aguadulce, La Costilla and Rota beaches, with values ranging from 30 to 70 m3/m. The largest erosion episodes have been recorded in the southernmost end of Valdelagrana spit, with values over 50 m3/m, and in Rota and Vistahermosa, after nourishment works. Main erosion and accretion pathways have been related to the existence of natural and human structures, which blocked the longshore drift suggesting the existence of littoral cells.

  7. Microplastics in the surface sediments from the Beijiang River littoral zone: Composition, abundance, surface textures and interaction with heavy metals.

    Science.gov (United States)

    Wang, Jundong; Peng, Jinping; Tan, Zhi; Gao, Yifan; Zhan, Zhiwei; Chen, Qiuqiang; Cai, Liqi

    2017-03-01

    While large quantities of studies on microplastics in the marine environment have been widely carried out, few were available in the freshwater environment. The occurrence and characteristics, including composition, abundance, surface texture and interaction with heavy metals, of microplastics in the surface sediments from Beijiang River littoral zone were investigated. The concentrations of microplastics ranged from 178 ± 69 to 544 ± 107 items/kg sediment. SEM images illustrated that pits, fractures, flakes and adhering particles were the common patterns of degradation. Chemical weathering of microplastics was also observed and confirmed by μ-FTIR. EDS spectra displayed difference in the elemental types of metals on the different surface sites of individual microplastic, indicating that some metals carried by microplastics were not inherent but were derived from the environment. The content of metals (Ni, Cd, Pb, Cu, Zn and Ti) in microplastics after ultrasonic cleaning has been analyzed by ICP-MS. Based on data from the long-term sorption of metals by microplastics and a comparison of metal burden between microplastics, macroplastics and fresh plastic products, we suggested that the majority of heavy metals carried by microplastics were derived from inherent load.

  8. Occurrence of Clinical and Sub-Clinical Mastitis in Dairy Herds in the West Littoral Region in Uruguay

    Science.gov (United States)

    Gianneechini, R; Concha, C; Rivero, R; Delucci, I; López, J Moreno

    2002-01-01

    Twenty-nine dairy farms were selected to determine the incidence of clinical mastitis, prevalence of sub-clinical mastitis and bacterial aetiology in the West Littoral Region of Uruguay. In samples taken by the owner and frozen at -20°C during a week the incidence rate of clinical mastitis was determined as 1.2 cases per 100 cow-months at risk. Staphylococcus aureus was the most common isolated pathogen in 37.5% of 40 milk samples from clinical cases obtained in 1 month. No bacteria grew in the 32.5% of the total samples. A sub-sample including 1077 dairy cows from randomly selected farms was used to determine the prevalence of sub-clinical mastitis. These samples were taken on one visit to each farm. The prevalence was 52.4% on a cow basis and 26.7% on an udder quarter basis. In 55.1% of the quarters of the selected animals with more than 300 000 cells/ml there was no growth. The isolated pathogens from sub-clinical cases and their relative frequencies were: Staphylococcus aureus 62.8%, Streptococcus agalactiae 11.3%, Enterococcus sp. 8%, coagulase-negative staphylococci 7.4%, Streptococus uberis 6.4%, Streptococcus dysgalactiae 1.8%, Escherichia coli 1.5% and Staphylococcus hyicus coagulase-positive 0.6%. PMID:12831175

  9. Integrated Observations From Fixed and AUV Platforms in the Littoral Zone at the SFOMC Coastal Ocean Observatory

    Science.gov (United States)

    Dhanak, M. R.

    2001-12-01

    A 12-hour survey of the coastal waters off the east coast of Florida at the South Florida Ocean Measurement Center (SFOMC) coastal ocean observatory, during summer 1999, is described to illustrate the observatory's capabilities for ocean observation. The facility is located close to the Gulf Stream, the continental shelf break being only 3 miles from shore and is therefore influenced by the Gulf Stream meanders and the instability of the horizontal shear layer at its edge. As a result, both cross-shelf and along-shelf components of currents in the littoral zone can undergo dramatic +/- 0.5 m/s oscillations. Observations of surface currents from an OSCR, and of subsurface structure from an autonomous underwater vehicle (AUV) platform, a bottom-mounted ADCP and CT-chain arrays during the survey will be described and compared. The AUV on-board sensors included upward and downward looking 1200kHz ADCP, a CTD package and a small-scale turbulence package, consisting of two shear probes and a fast-response thermistor. Prevailing atmospheric conditions were recorded at an on-site buoy. The combined observations depict flows over a range of scales. Acknowledgements: The observations from the OSCR are due to Nick Shay and Tom Cook (University of Miami), and from the bottom-mounted ADCP, CT chain arrays and the surface buoy are due to Alex Soloviev (Nova Southeastern University) and Mark Luther and Bob Weisberg (University of South Florida).

  10. CONTAMINATION PAR ANGUILLICOLA CRASSUS DE CINQ POPULATIONS D’ANGUILLES (ANGUILLA ANGUILLA DU LITTORAL DE BRETAGNE SUD (FRANCE

    Directory of Open Access Journals (Sweden)

    SAUVAGET B.

    2003-07-01

    Full Text Available Les anguilles prélevées dans cinq zones de salinité variable du littoral de Bretagne sud, ont été examinées pour leur infestation présente et passée par le parasite Anguillicola crassus (Nematoda, dracunculoidea. Les anguilles vivant dans des milieux peu salés au contact de la zone dulçaquicole sont très contaminées avec des prévalences supérieures à 90%, dont 61% concernent des prévalences présentes. Par contre, celles vivant dans des conditions estuariennes (Golfe du Morbihan sont relativement épargnées avec des prévalences de l’ordre de 15%, dont en moyenne moins de la moitié concernent des prévalences présentes. La salinité des baies et des estuaires semble donc pouvoir préserver de la contamination les populations d’anguilles côtières dont la gestion devient un enjeu prioritaire pour le stock d’anguilles.

  11. Estimation of canine Leishmania infection prevalence in six cities of the Algerian littoral zone using a Bayesian approach.

    Science.gov (United States)

    Adel, Amel; Abatih, Emmanuel; Speybroeck, Niko; Soukehal, Abdelkrim; Bouguedour, Rachid; Boughalem, Karim; Bouhbal, Abdelmalek; Djerbal, Mouloud; Saegerman, Claude; Berkvens, Dirk

    2015-01-01

    A large-scale study on canine Leishmania infection (CanL) was conducted in six localities along a west-east transect in the Algerian littoral zone (Tlemcen, Mostaganem, Tipaza, Boumerdes, Bejaia, Jijel) and covering two sampling periods. In total 2,184 dogs were tested with an indirect fluorescent antibody test (IFAT) and a direct agglutination test (DAT). Combined multiple-testing and several statistical methods were compared to estimate the CanL true prevalence and tests characteristics (sensitivity and specificity). The Bayesian full model showed the best fit and yielded prevalence estimates between 11% (Mostaganem, first period) and 38% (Bejaia, second period). Sensitivity of IFAT varied (in function of locality) between 86% and 88% while its specificity varied between 65% and 87%. DAT was less sensitive than IFAT but showed a higher specificity (between 80% and 95% in function of locality or/and season). A general increasing trend of the CanL prevalence was noted from west to east. A concordance between the present results and the incidence of human cases of visceral leishmaniasis was observed, where also a maximum was recorded for Bejaia. The results of the present study highlight the dangers when using IFAT as a gold standard.

  12. Carnobacterium iners sp. nov., a psychrophilic, lactic acid-producing bacterium from the littoral zone of an Antarctic pond.

    Science.gov (United States)

    Snauwaert, Isabel; Hoste, Bart; De Bruyne, Katrien; Peeters, Karolien; De Vuyst, Luc; Willems, Anne; Vandamme, Peter

    2013-04-01

    Two lactic acid-producing, Gram-stain-positive rods were isolated from a microbial mat actively growing in the littoral zone of an Antarctic lake (Forlidas Pond) in the Pensacola mountains and studied using a polyphasic taxonomic approach. The isolates were examined by phylogenetic analysis of the 16S rRNA gene, multilocus sequence analysis of pheS, rpoA and atpA, and biochemical and genotypic characteristics. One strain, designated LMG 26641, belonged to Carnobacterium alterfunditum and the other strain, designated LMG 26642(T), could be assigned to a novel species, with Carnobacterium funditum DSM 5970(T) as its closest phylogenetic neighbour (99.2 % 16S rRNA gene sequence similarity). Carnobacterium iners sp. nov. could be distinguished biochemically from other members of the genus Carnobacterium by the lack of acid production from carbohydrates. DNA-DNA relatedness confirmed that strain LMG 26642(T) represented a novel species, for which we propose the name Carnobacterium iners sp. nov. (type strain is LMG 26642(T)  = CCUG 62000(T)).

  13. Techno-economy of Iberomaurusian Lithic Assemblages. New data from Courbet-Marine (north-eastern littoral of Algiers

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    Latifa Sari

    2009-09-01

    Full Text Available Courbet-Marine is one of the few open area sites belonging to the Iberomaurusian, a Late Upper Palaeolithic culture in the north-eastern littoral of Algiers, for which primary siliceous outcrops are lacking. The methodology used is based on a techno-economic approach and introduces new data concerning the inventory and characterisation of mineral potential of surrounding areas, and, furthermore, the different knapping techniques applied to the prehistoric lithic raw material. The field survey has contributed to the characterisation of both geological and archaeological siliceous rocks, supported by petrographic and geochemical analyses. Moreover, the re-examination of the Courbet-Marine lithic assemblage provided evidence for the strategies used in obtaining a non-local brown flint. This last, selected for its homogeneous texture and its large size, was transported in the shape of semi-finished products to the prehistoric site. In addition, this brown flint allows a more elaborate knapping technique than flint of alluvial origin.

  14. Comparing sediment quality in Spanish littoral areas affected by acute (Prestige, 2002) and chronic (Bay of Algeciras) oil spills

    Energy Technology Data Exchange (ETDEWEB)

    Morales-Caselles, C. [Instituto de Ciencias Marinas de Andalucia (ICMAN-CSIC), Avda. Republica Saharaui s/n, Puerto Real 11510, Cadiz (Spain); Unidad Asociada de Calidad Ambiental y Patologia (CSIC and UCA), Avda. Republica Saharaui s/n, Puerto Real 11510, Cadiz (Spain); Kalman, J. [Instituto de Ciencias Marinas de Andalucia (ICMAN-CSIC), Avda. Republica Saharaui s/n, Puerto Real 11510, Cadiz (Spain); Unidad Asociada de Calidad Ambiental y Patologia (CSIC and UCA), Avda. Republica Saharaui s/n, Puerto Real 11510, Cadiz (Spain); Riba, I. [Instituto de Ciencias Marinas de Andalucia (ICMAN-CSIC), Avda. Republica Saharaui s/n, Puerto Real 11510, Cadiz (Spain); Unidad Asociada de Calidad Ambiental y Patologia (CSIC and UCA), Avda. Republica Saharaui s/n, Puerto Real 11510, Cadiz (Spain); DelValls, T.A. [UNESCO UNITWIN/UNICOP, Facultad de Ciencias del Mar y Ambientales, Universidad de Cadiz, Poligono Rio San Pedro s/n, Puerto Real 11510, Cadiz (Spain) and Unidad Asociada de Calidad Ambiental y Patologia - CSIC and UCA, Avda. Republica Saharaui s/n, Puerto Real 11510, Cadiz (Spain)]. E-mail: angel.valls@uca.es

    2007-03-15

    The quality of sediments collected from two areas of the Spanish coast affected by different sources of contaminants has been compared in this study. The areas studied are the coast of Galicia affected by the oil spill from the tanker Prestige (November 2002) and the Gulf of Cadiz which suffers continuous inputs of contaminants from industries located in the area and from oil spills. Contamination by several chemicals (metals, PCBs and PAHs) that bind to sediments was analyzed, and two toxicity tests (Microtox[reg]) and amphipod 10-day bioassay) were conducted. PAHs were identified as the compounds responsible for the toxic effects. Results show differences between an acute impact related to the sinking of the tanker Prestige and the chronic impact associated with continuous oil spills associated with the maritime and industrial activities in the Bay of Algeciras, this being the most polluted part of the two coastal areas studied in this work. - Littoral sediments affected by low or moderated but continuous oil spills are more polluted than those affected by accidental oil spills such as the Prestige.

  15. Littoral cell angioma of the spleen in a patient with previous pulmonary sarcoidosis: a TNF-α related pathogenesis?

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    Titze Ulf

    2011-09-01

    Full Text Available Abstract Background Littoral cell angioma (LCA is a rare vascular tumor of the spleen. Generally thought to be benign, additional cases of LCA with malignant features have been described. Thus, its malignant potential seems to vary and must be considered uncertain. The etiology remains unclear, but an immune dysregulation for the apparent association with malignancies of visceral organs or immune-mediated diseases has been proposed. Case Presentation We report a case of LCA in a 43-year old male patient who presented with a loss of appetite and intermittent upper abdominal pain. Computed tomography showed multiple hypoattenuating splenic lesions which were hyperechogenic on abdominal ultrasound. Lymphoma was presumed and splenectomy was performed. Pathological evaluation revealed LCA. Conclusions LCA is a rare, primary vascular neoplasm of the spleen that might etiologically be associated with immune dysregulation. In addition, it shows a striking association with synchronous or prior malignancies. With about one-third of the reported cases to date being co-existent with malignancies of visceral organs or immune-mediated diseases, this advocates for close follow-ups in all patients diagnosed with LCA. To our knowledge, this report is the first one of LCA associated with previous pulmonary sarcoidosis and hypothesizes a TNF-α related pathogenesis of this splenic tumor.

  16. New distribution ranges and records of caridean shrimps (Crustacea: Decapoda: Caridea from the west coast of Mexico Nuevos intervalos de distribución y registros de camarones carideos (Crustacea: Decapoda: Caridea de la costa oeste de México

    Directory of Open Access Journals (Sweden)

    Michel E. Hendrickx

    2011-04-01

    Full Text Available Geographic records are presented for 24 species of Caridea (Crustacea: Decapoda along Pacific coast of Mexico, in the East Pacific. New records are presented for Psathyrocaris fragilis Wood-Mason, 1893 (from Peru to Mexico, Periclimenes infraspinis (Rathbun, 1902, Pontonia margarita Smith, 1869, Alpheus cristulifrons Rathbun, 1900, Alpheus umbo Kim & Abele, 1988, Automate rugosa Coutière, 1900, and Lysmata californica (Stimpson, 1866 (within the Gulf of California, and Typton hephaestus Holthuis, 1951 (from the Gulf of California to the Gulf of Tehuantepec, Mexico. Aditional records are given that establish the presence of species at intermediate localities within the Gulf of California and along the southwestern coast of Mexico.Se recolectaron especímenes de 24 especies de Caridea (Crustacea: Decapoda en la costa del Pacífico de México, en el Pacífico Este. Nuevos registros geográficos son señalados para Psathyrocaris fragilis Wood-Mason, 1893 (desde Perú hasta México, Periclimenes infraspinis (Rathbun, 1902, Pontonia margarita Smith, 1869, Alpheus cristulifrons Rathbun, 1900, Alpheus umbo Kim & Abele, 1988, Automate rugosa Coutière, 1900 y Lysmata californica (Stimpson, 1866 (en el Golfo de California y para Typton hephaestus Holthuis, 1951 (del Golfo de California hasta el Golfo de Tehuantepec, México. Se proporciona información adicional acerca de la presencia de algunas especies en localidades intermedias en el Golfo de California y a lo largo de la costa suroeste de México.

  17. Occurrence of the lessepsian species Portunus pelagicus (Crustacea and Apogon pharaonis (Pisces in the marine area of Rhodes Island

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    M. CORSINI-FOKA

    2004-06-01

    Full Text Available A large number of Red Sea species are colonizing the eastern Mediterranean Sea via the Suez Canal, mainly following the Anatolian coasts and spreading westwards. Portunus pelagicus is one of the most common Red Sea swimming crabs, first recorded in the Levantine Basin in 1898. Four specimens of P. pelagicus were collected in different marine areas of Rhodes Island from 1991 to 2000, while three specimens of the lessepsian fish Apogon pharaonis, first recorded in the Mediterranean in 1947, were caught during 2002 in the NW coast of Rhodes. The sub-tropical character of the marine area around Rhodes seems to facilitate the propagation of lessepsian species. These migrants have reached the island at different velocity and degree of establishment of their populations. The occurrence of the blue swimmer crab P. pelagicus and of the bullseye cardinal fish A. pharaonis increases the number of the decapod Crustacea and fish species of Red Sea origin observed in Greek waters.

  18. Occurrence of the lessepsian species Portunus pelagicus (Crustacea and Apogon pharaonis (Pisces in the marine area of Rhodes Island

    Directory of Open Access Journals (Sweden)

    M. CORSINI-FOKA

    2012-12-01

    Full Text Available A large number of Red Sea species are colonizing the eastern Mediterranean Sea via the Suez Canal, mainly following the Anatolian coasts and spreading westwards. Portunus pelagicus is one of the most common Red Sea swimming crabs, first recorded in the Levantine Basin in 1898. Four specimens of P. pelagicus were collected in different marine areas of Rhodes Island from 1991 to 2000, while three specimens of the lessepsian fish Apogon pharaonis, first recorded in the Mediterranean in 1947, were caught during 2002 in the NW coast of Rhodes. The sub-tropical character of the marine area around Rhodes seems to facilitate the propagation of lessepsian species. These migrants have reached the island at different velocity and degree of establishment of their populations. The occurrence of the blue swimmer crab P. pelagicus and of the bullseye cardinal fish A. pharaonis increases the number of the decapod Crustacea and fish species of Red Sea origin observed in Greek waters.

  19. Focused ion beam/scanning electron microscopy studies of Porcellio scaber (Isopoda, Crustacea) digestive gland epithelium cells.

    Science.gov (United States)

    Drobne, Damjana; Milani, Marziale; Zrimec, Alexis; Zrimec, Maja Berden; Tatti, Francesco; Draslar, Kazimir

    2005-01-01

    The focused ion beam (FIB) was used to prepare cross sections of precisely selected regions of the digestive gland epithelium of a terrestrial isopod P. scaber (Isopoda, Crustacea) for scanning electron microscopy (SEM). The FIB/SEM system allows ad libitum selection of a region for gross morphologic to ultrastructural investigation, as the repetition of FIB/SEM operations is unrestricted. The milling parameters used in our work proved to be satisfactory to produce serial two-dimensional (2-D) cuts and/or three-dimensional (3-D) shapes on a submicrometer scale. A final, cleaning mill at lower ion currents was employed to minimize the milling artifacts. After cleaning, the milled surface was free of filament- and ridge-like milling artifacts. No other effects of the cleaning mill were observed.

  20. Bioaccumulation in Porcellio scaber (Crustacea, Isopoda) as a measure of the EDTA remediation efficiency of metal-polluted soil.

    Science.gov (United States)

    Udovic, Metka; Drobne, Damjana; Lestan, Domen

    2009-10-01

    Leaching using EDTA applied to a Pb, Zn and Cd polluted soil significantly reduced soil metal concentrations and the pool of metals in labile soil fractions. Metal mobility (Toxicity Characteristic Leaching Procedure), phytoavailability (diethylenetriaminepentaacetic acid extraction) and human oral-bioavailability (Physiologically Based Extraction Test) were reduced by 85-92%, 68-91% and 88-95%, respectively. The metal accumulation capacity of the terrestrial isopod Porcellio scaber (Crustacea) was used as in vivo assay of metal bioavailability, before and after soil remediation. After feeding on metal contaminated soil for two weeks, P. scaber accumulated Pb, Zn and Cd in a concentration dependent manner. The amounts of accumulated metals were, however, higher than expected on the basis of extraction (in vitro) tests. The combined results of chemical extractions and the in vivo test with P. scaber provide a more relevant picture of the availability stripping of metals after soil remediation.

  1. Groundwater geochemistry observations in littoral caves of Mallorca (western Mediterranean: implications for deposition of phreatic overgrowths on speleothems

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    Bogdan P. Onac

    2014-05-01

    Full Text Available Phreatic overgrowths on speleothems (POS precipitate at the air-water interface in the littoral caves of Mallorca, Spain. Mainly composed of calcite, aragonite POS are also observed in specific locations. To characterize the geochemical environment of the brackish upper water column, water samples and salinity values were collected from water profiles (0-2.9 m in April 2012 and March 2013 near aragonite POS in Cova des Pas de Vallgornera and calcite POS in Coves del Drac (hereafter, Vallgornera and Drac. Degassing of CO2 from the water was evidenced by the existence of lower dissolved inorganic carbon (DIC concentration and enriched δ13CDIC values in a thin surface layer (the uppermost 0.4 m, which was observed in both profiles from Drac. This process is facilitated by the efficient exchange of cave air with the atmosphere, creating a CO2 partial pressure (pCO2 disparity between the cave water and air, resulting in the precipitation of calcite POS as CO2 degasses from the water. The degassed upper layer was not observed in either profile from Vallgornera, suggesting that less efficient cave ventilation restricts outgassing of CO2, which also results in accumulation of CO2 in the cave atmosphere. The presence of an existing uncorroded POS horizon, as well as higher concentrations and large amplitude fluctuations of cave air pCO2, may indicate that aragonite POS deposition is currently episodic in Vallgornera. Ion concentration data from monthly water samples collected in each cave between October 2012 and March 2013 indicate higher Mg:Ca, Sr:Ca, Ba:Ca and Sr:Mg ratios in Vallgornera. Salinity alone does not appear to be a viable proxy for ions that may promote aragonite precipitation or inhibit calcite precipitation. Instead, these ions may be contributed by more intense bedrock weathering or deep groundwater flow.

  2. The fate of the herbicide propanil in plants of the littoral zone of the Three Gorges Reservoir (TGR), China.

    Science.gov (United States)

    Chen, Zhongli; Schäffer, Andreas

    2016-10-01

    The anti-seasonal hydrology with 30m water fluctuations in the Three Gorges Reservoir (TGR) of China attracts growing environmental and ecological concerns. We investigated the biotransformation of the herbicide propanil in plants dominating in the littoral zone of the TGR by applying the (14)C-ring-labeled herbicide into non-aseptic hydroponic plant systems (Cynodon dactylon, Nelumbo nucifera and Bidens pilosa), aseptic plants (Lemna minor and Lemna gibba) and cell suspension cultures (C. dactylon and L. minor). (1) Propanil absorbed in plants of the hydroponic systems was (12.46±1.63)% of applied radioactivity (AR) (C. dactylon), (52.36±6.38)% (N. nucifera) and (76.55±6.07)% (B. pilosa), respectively. The (14)C-residues in the plant extractable fractions and the corresponding media were confirmed by radio-Thin Layer Chromatography (TLC), radio-High Performance Liquid Chromatography (HPLC) and Gas Chromatography-Electron Ionization Mass Spectrometry (GC-EIMS) as propanil, 3,4-dichloroaniline (DCA) and N-(3,4-dichlorophenyl)-β-d-glucopyranosylamine (Glu-DCA). (2) About 8% of AR was taken up by both aseptic plants, from which 7.0% of AR was extracted and identified also as propanil, DCA and Glu-DCA. (3) Concerning cell suspension cultures, (39.22±9.39)% of AR was absorbed by C. dactylon after 72hr, whereas the accumulated (14)C-propanil by L. minor cell suspension culture amounted to (65.04±1.72)% after 7days. The identified compounds in cell cultures are consistent with those in the tested plants. Most of the pesticide residues in the intact plants were un-extractable, which are recognized as the end of the detoxification process. We therefore consider these plants as suitable for the phytoremediation of the herbicide propanil in the TGR region. Copyright © 2016. Published by Elsevier B.V.

  3. [The determinants of the low case fatality rate of the cholera epidemic in the Littoral department of Benin in 2008].

    Science.gov (United States)

    Gbary, Akpa Raphaël; Sossou, Roch Aristide; Dossou, Jean-Paul; Mongbo, Virginie; Massougbodji, Achille

    2011-01-01

    The 2008 cholera outbreak in Benin was characterized by a low case fatality rate (0.39 p.100) in the Littoral department, where 502 cases were recorded between July and December. The aim of this study was to identify the key factors associated with the low case fatality rate within the department. The cross-sectional, descriptive and analytical study conducted as part of this research used 404 patient records, focus group discussions with ten former patients, in-depth interviews with 8 health authorities involved in the response and structured face-to-face interviews with 12 health personnel involved in the treatment of patients. The data were analyzed using qualitative and quantitative content analysis based on EPIINFO 3.3.2 and EXCEL 2007 software. The results from several sources were cross-checked through triangulation. The mean age of patients was 23.72 ± 14.8 years. 39.35% patients were admitted with severe dehydration. Oral rehydration, intravenous rehydration and antibiotic therapy were given to 99.5%, 85% and 97.77% of patients, respectively. Only one hospital death was noted. The low case fatality rate was mainly due to the following factors: the high quality of care provided in a center with qualified personnel and available and free of charge treatment kits, protocols based on massive rehydration and appropriate hygiene measures, and patient compliance with the treatment plan. The response was also characterized by good coordination, wide mass and local health promotion, and selective antibiotic prophylaxis, which contributed significantly to reducing the spread of the infection.

  4. 26. Relationship between ABO Blood Groups and Carcinoma of Esophagus and Cardia in Chaoshan Littoral of China

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Abstract: Background. Chaoshan is the only littoral among the six high-risk areas of esophageal carcinoma (EC) in China and the relatively isolatal society for the inconvenient transport gives an opportunity to study the genetics of carcinoma of esophagus and cardia. Some reports had suggested that ABO blood groups were associated with tumors, but their relation remained controversial. Methods: The data of age, sex, ABO blood type and X-ray or pathological diagnosis of the patients with carcinoma of esophagus or cardia were collected from The tumor hospital, First affiliated hospital, Second affiliated hospital of Shantou University Medical College; the Center hospital of Shantou and the Center hospital of Jieyang. In this study, 6 685 patients with EC and 2 955 patients with cardiac cancer(CC) in Chaoshan district were retrospectively assessed the association with ABO blood groups. Results: The distribution of ABO blood groups in patients with EC or CC was similar to the normal local population in Chaoshan. However, there was 2.3% excess of blood group B in male patients with CC and 4.7% excess in the patients with carcinoma in the upper third esophagus, compared with the corresponding controls. The relative risk B:O was 1.1415 (P<0.05) and 1.2696 (P<0.05), respectively No relationship between ABO blood groups and tumor differentiation was found. Conclusion: ABO blood group B was associated with the incidence of CC in male individuals and carcinoma in the upper third esophagus. The distribution of ABO blood groups varied in the different geographical and ethnic groups, as a result, proper controls were very important for such study.

  5. Impact of nutrient enrichment and fish introductions on the structure and function of experimental shallow littoral lagoons

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    Oriol Cano-Rocabayera

    2015-12-01

    Full Text Available Mediterranean coastal lagoons are probably one of the most singular and endangered ecosystems worldwide. Common threats to other aquatic ecosystems are nutrient enrichment and species introductions. In shallow and warm areas, the environmental concern may be even exacerbated by an increase in nutrient levels and biotic interactions due to the low water flow, coupled to the temperature-sensitivity of ectotherms’ metabolism and hence ecological processes. Nutrient enrichment can benefit ecosystem productivity when the bottom-up effect of nutrients is counteracted by top-down controllers such as macro-invertebrates and/or fish. This balance can, however, be directly and indirectly disrupted by excessive fertilization and/or the release of exotic species. Ammonia and nitrite has long been considered a water quality hazard but the toxic effects of nitrates are still poorly studied. The present study examined experimentally the multi-trophic impacts of chronic nitrate exposure and/or the invasive eastern mosquitofish (Gambusia holbrooki on the structure and function of shallow littoral lagoons. Specifically, we monitored ecosystem metabolism (primary production and leaf litter decomposition and the community structure of pelagic and benthonic macro-invertebrates during 2 months. Preliminary results show that chronic nitrate pollution and/or G. holbrooki can profoundly alter the structure and function of coastal lagoon ecosystems, and that pelagic and benthonic sub-systems are coupled in response to these anthropogenic stressors. Although the long-term consequences of these findings remain to be examined in detail, this study will increase our mechanistic understanding of how the top-down and bottom-up controllers of aquatic ecosystems are affected by major drivers of global change typified by nitrate pollution and an invasive species.

  6. Evolution and phylogeny of the mud shrimps (Crustacea: Decapoda revealed from complete mitochondrial genomes

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    Lin Feng-Jiau

    2012-11-01

    Full Text Available Abstract Background The evolutionary history and relationships of the mud shrimps (Crustacea: Decapoda: Gebiidea and Axiidea are contentious, with previous attempts revealing mixed results. The mud shrimps were once classified in the infraorder Thalassinidea. Recent molecular phylogenetic analyses, however, suggest separation of the group into two individual infraorders, Gebiidea and Axiidea. Mitochondrial (mt genome sequence and structure can be especially powerful in resolving higher systematic relationships that may offer new insights into the phylogeny of the mud shrimps and the other decapod infraorders, and test the hypothesis of dividing the mud shrimps into two infraorders. Results We present the complete mitochondrial genome sequences of five mud shrimps, Austinogebia edulis, Upogebia major, Thalassina kelanang (Gebiidea, Nihonotrypaea thermophilus and Neaxius glyptocercus (Axiidea. All five genomes encode a standard set of 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes and a putative control region. Except for T. kelanang, mud shrimp mitochondrial genomes exhibited rearrangements and novel patterns compared to the pancrustacean ground pattern. Each of the two Gebiidea species (A. edulis and U. major and two Axiidea species (N. glyptocercus and N. thermophiles share unique gene order specific to their infraorders and analyses further suggest these two derived gene orders have evolved independently. Phylogenetic analyses based on the concatenated nucleotide and amino acid sequences of 13 protein-coding genes indicate the possible polyphyly of mud shrimps, supporting the division of the group into two infraorders. However, the infraordinal relationships among the Gebiidea and Axiidea, and other reptants are poorly resolved. The inclusion of mt genome from more taxa, in particular the reptant infraorders Polychelida and Glypheidea is required in further analysis. Conclusions Phylogenetic analyses on the mt genome

  7. 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.

  8. Estudios sobre los Entomostráceos de Colombia.V. Limnadia Orinoquiensis, una nueva especie de la familia Limnadiidae Sars, 1896 (Arthropoda, Crustacea, Conchostraca Estudios sobre los Entomostráceos de Colombia.V. Limnadia Orinoquiensis, una nueva especie de la familia Limnadiidae Sars, 1896 (Arthropoda, Crustacea, Conchostraca

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    Roessler Ewald W.

    1991-06-01

    Full Text Available En el presente estudio se describen rasgos morfológicos de una nueva especie colombiana del género Limnadia Brongniart, 1820, Limnadia orinoquiensis (Arthropoda, Crustacea, Conchostraca. La forma es de reproducción bisexual y típica para las aguas ácidas y oscuras de los alrededores de Puerto Inírida, Comisaria del Guainía. The present study describes morfological features of a new colombian species of the genus Limnadia Brongniart, 1820, Limnadia orinoquiensis (Arthropoda, Crustacea, Conchostraca, a species of bisexual reproduction, typical to the dark waters of temporary pools in the surroundings of Puerto Inírida, Comisaria of Guainía.

  9. Lead isotopes in soils and groundwaters as tracers of the impact of human activities on the surface environment: The Domizio-Flegreo Littoral (Italy) case study

    Science.gov (United States)

    Grezzi, G.; Ayuso, R.A.; de Vivo, B.; Lima, A.; Albanese, S.

    2011-01-01

    The isotopic signature of geogenic and anthropogenic materials, in combination with concentration data for pollutants, can help trace the origin and the extent of contamination in the environment. This approach is particularly effective if naturally occurring and anthropogenically introduced metals have different isotopic ratios. Lead isotope analysis on soils from 7 profiles (1. m depth) and on groundwaters from 8 wells have been used to determine the impact of human activities on the surface environment of Domizio-Flegreo Littoral. Result obtained show that in sub-rural areas the isotopic composition of the samples collected along the soil profiles of Domizio-Flegreo Littoral is likely mostly controlled by the nature of the parent geologic material (natural) while in more urbanized areas (Giugliano) Pb isotopic composition in superficial soils is mostly influenced by anthropic sources such as motor vehicles. Lead isotopic ratios in groundwaters also show that the use of pesticides and, probably, the influence of aerosols and the presence of illegal waste disposal can influence water quality. ?? 2010 Elsevier B.V.

  10. [Distribution and abundance of fish community in the littoral area of "Los Petenes" Biosphere Reserve, Campeche, Mexico].

    Science.gov (United States)

    Muñoz-Rojas, Sandra; Ayala-Pérez, Luis Amado; Sosa-López, Atahualpa; Villalobos-Zapata, Guillermo Jorge

    2013-03-01

    "Los Petenes" Biosphere Reserve (RBLP) is a critical habitat for many aquatic and terrestrial species. It has the biggest and better conserved seagrass beds, and it represents an important habitat for food, protection and breeding of aquatic organisms, and a temporal refuge for migratory species. The objective of this study was to describe the ichthyofauna diversity in the littoral coastal area of the RBLP, to identify the ecological dominant species, and to analyze the abundance of the fish community and its temporal and spatial changes, and their relationship with some environmental variables. Monthly fish samples were obtained with the aid of trawl nets, from 24 samplings sites distributed along the reserve, between May 2009 and April 2010. The trawl net was operated 288 times and 21 795 individuals with 279.5kg of weight were collected. A total of 46 fish species grouped in 34 genera and 23 families were identified. In a spatial scale, the abundance showed the next ranges: 0.018-0.094ind./m2; 0.249-1.072 g/m2 and 9.75-19.32g/ind.; the diversity indexes obtained were: H'n=1.46-2.15, J'=0.45-0.71 and D'=2.08-3.92. In a temporal scale, the abundance and diversity ranged between: 0.026-0.066ind./m2; 0.342-0.764g/m2 and 6.49-22.98g/ind.; H'n=1.76-2.08; J'=0.52-0.64 and D'=3.07-4.18. Eleven dominant species were identified with a representation of the 94.39% in number of individuals, and 89.66% in weight of the total catch. From the total, eight species had economic or commercial importance, especially Lagodon rhomboides and Haemulon plumierii. The cluster analyses identified four fish associations; these results are discussed in order to identify relationships between habitat-species. Finally, the canonical correspondence analysis evidenced an association between H. plumierii with salinity and dissolved solids. The RBLP has high habitat diversity and its fish community has developed strategies to use all the spatial and temporal conditions and to satisfy the needs

  11. La conquête du littoral « indien » d’Afrique du Sud 

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    Sylvain Guyot

    2008-10-01

    Full Text Available Le littoral « indien » en Afrique du Sud représente un véritable « front pionnier côtier », dont la conquête, l’appropriation territoriale et la valorisation économique (portuaire, industrielle, touristique, environnementale, agricole sont stratégiques pour différents groupes de populations (Anglophones, Afrikaner, Zulus, Xhosas…, à différentes périodes temporelles (précolonial, colonial, apartheid et postapartheid. Ces différents modes de valorisation ainsi que les différents groupes en jeu entrent régulièrement en conflit tout en se recomposant au fil des temps. Dans cet article, à l’aide d’exemples croisant temporalités, acteurs et modes de valorisation littorale, nous caractérisons les différentes phases de cette conquête littorale, toujours d’actualité depuis la fin de l’apartheid en raison de la connexion de l’ensemble des zones côtières aux processus de globalisation. La conquête de cette ultime « frontière australe de l’Afrique » par des forces essentiellement exogènes présente un certain nombre de limites, comme la difficile intégration des populations locales, la privatisation de l’espace côtier et une durabilité environnementale mal maîtrisée.The “Indian” south African coastline can be understood as a frontier. Its conquest is strategic for different groups (English-speaking, Afrikaners, Zulus, Xhosas etc. and implies specific economic valorisations (seaports, industries, tourism, nature conservation, agriculture grounded in time (pre-colonial, colonial, apartheid and post-apartheid and space (different modes of territorial appropriation. Opposed types of coastal valorisation and various stakeholders open the way to hard conflicts. Different phases of this seafront conquest, with particular reference to the current post-apartheid connection to globalisation dynamics, are enlightened by examples linking history, stakeholders and various coastal development options. The

  12. Mavale project: Sensor techniques applied to macrozoning of the Paraiba Valley and littoral north of the State of Sao Paulo

    Science.gov (United States)

    1991-04-01

    This project was designed with two basic objectives in mind. The first is to support the Consortium for Integrated Development of the Paraiba Valley and the Northern Littoral (CODIVAP) for preparation of regulatory guidelines for use of the regional lands. The second is to place at the disposal of the country's technical/scientific community a regional planning method based on the use of Remote Orbital Sensor data. This project involved studies on the following areas: maps - geological, pedological, geomorphological, ground cover, land use, urban area and urban expansion in the last decade, areas favorable for replenishment and concentration of ground water; compartmentation of the region into sub-basins and study of the relationships of land use to surface water quality; generation of a map indicating the suitability of land for civil engineering and urban expansion projects and projects subject to geological risk; preparation of a map showing suitability for agricultural use of the land; and social/economic/demographic analysis. The region of the study encompasses 40 municipalities and portions of 4 others, in an overall region of 18.111 sq. km. Imagery from MSS/Landsat, TM/Landsat, and HRV/SPOT was interpreted, exploring the multispectral, multitemporal, synoptic characteristics as well as the detail (compatible with spatial resolutions of the sensor systems). As a function of the objectives of the different thematic studies involved in the environmental and physical diagnostics, images were interpreted visually or processed digitally in alternate scales of 1:250,000, 1:100,000, or 1:50,000. These studies were complemented with pre-existing bibliographical and cartographic information, and the final mapping products are presented to the scale of 1:250,000, compatible with decisions at the regional level. Thematic studies relative to the physical/territorial, and social/economical reality were integrated in the search for holistic understanding of the region and

  13. Approche expérimentale de l'impact des oiseaux piscivores sur une pisciculture extensive littoral

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    GENARD M.

    1993-04-01

    Full Text Available Une étude quantitative de la prédation par des oiseaux piscivores, le Héron Cendré (Ardea cinerea et le Grand Cormoran (Phalacrocorax carbo a été réalisée dans un bassin (2 ha situé dans un vaste ensemble de réservoirs à poissons (140 ha en eau saumâtre du littoral atlantique. Deux enclos, l'un protégé de la prédation par des filets et des fils (0,3 ha, l'autre accessible aux oiseaux (0,9 ha, ont été empoissonnés avec des Mulets (Chelon labrosus et Liza ramada. L'observation régulière des oiseaux a permis de constater dans les jours suivant l'empoissonnement une concentration spectaculaire mais brève des prédateurs, hérons et cormorans se partageant respectivement les zones peu profondes et profondes de l'enclos non protégé. Le dénombrement des poissons après trois semaines d'expérimentation a montré un épuisement total du stock de poissons. Les caractéristiques essentielles de la prédation sont la rapidité d'intervention des piscivores et la faible part des prélèvements par le héron (3 % du stock initial, malgré un taux de succès élevé (nombre de prises/nombre d'attaques. La prédation par le cormoran n'a pu être dissociée de la mortalité indirectement due aux prédateurs. Cependant, il est vraisemblable que ce prédateur soit à l'origine d'une grande part de la mortalité correspondante, évaluée entre 64 et 97 % du stock initial. L'importance de cette prédation s'explique par la fréquentation et l'intensité de la pêche (nombre d'attaques par minute plus élevées que chez le héron.

  14. Long-distance dispersal, low connectivity and molecular evidence of a new cryptic species in the obligate rafter Caprella andreae Mayer, 1890 (Crustacea: Amphipoda: Caprellidae)

    Science.gov (United States)

    Cabezas, M. Pilar; Navarro-Barranco, Carlos; Ros, Macarena; Guerra-García, José Manuel

    2013-09-01

    The amphipod Caprella andreae Mayer, 1890 was recorded for the first time in Southern Iberian Peninsula (36°44'15″N, 3°59'38″W). This species is the only obligate rafter of the suborder Caprellidea and has been reported to attach not only to floating objects such as ropes or driftwoods but also to turtle carapaces. Mitochondrial and nuclear markers were used to examine dispersal capabilities and population genetic structure of C. andreae across seven localities in the Mediterranean and Atlantic Ocean collected from floating substrata with different dispersal patterns. The strong population differentiation with no haplotypes shared between populations suggests that C. andreae is quite faithful to the substratum on which it settles. In addition, the proportionally higher genetic diversity displayed in populations living on turtles as well as the presence of highly differentiated haplotypes in the same turtle population may be indicative that these populations survive longer, which could lead C. andreae to prefer turtles instead of floating objects to settle and disperse. Therefore, rafting on floating objects may be sporadic, and ocean currents would not be the most important factor shaping patterns of connectivity and population structure in this species. Furthermore, molecular phylogenetic analyses revealed the existence of a cryptic species whose estimates of genetic divergence are higher than those estimated between C. andreae and other congeneric species (e.g. Caprella dilatata and Caprella penantis). Discovery of cryptic species among widely distributed small marine invertebrates is quite common and, in this case, prompts for a more detailed phylogenetic analysis and taxonomic revision of genus Caprella. On the other hand, this study also means the first record of the gammarids Jassa cadetta and Elasmopus brasiliensis and the caprellid Caprella hirsuta on drifting objects.

  15. Evaluation of the haematological parameters in Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae with Argulus sp. (Crustacea, Branchiura infestation and treatment with organophosphate

    Directory of Open Access Journals (Sweden)

    Marcos Tavares-Dias

    1999-06-01

    Full Text Available Haematological parameters as erythrocytes, leukocytes and plasma glucose in Piaractus mesopotamicus Holmberg, 1887 were analyzed. Fish were parasitized with Argulus sp. (Crustacea, Branchiura and treated with 0.4 mg of thriclorphon 500/L water. The effects of parasitism and the action of the treatment were evaluated. Parasitized fish showed greater number of monocytes (P>0.05 and special granulocitic cells (P0.05. Organophosphate treatment presented significantly reduction (P>0.05 in red blood cells (RBC and hemoglobin.

  16. Diversity and Spatial Distribution of Extant Freshwater Ostracodes (Crustacea in Ancient Lake Ohrid (Macedonia/Albania

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    Julia Lorenschat

    2014-07-01

    that influence ostracode distributions in Lake Ohrid are water depth and conductivity. In general, species richness, diversity and evenness were greater in waters <60 m deep, with highest values often found in the littoral zone, at depths <30 m. Candonids, however, displayed highest diversity in the sublittoral (30–50 m and profundal (50–280 m zones. The most frequent species encountered are taxa endemic to the lake (14 living species, which have a wide depth range (≤280 m, and display higher abundance with greater water depth. Non-endemic species were rare, limited to water depths <50 m, and were found mainly in the north part of the lake where anthropogenic pressure is high. Several cosmopolitan species were encountered for the first time, which suggests that these widespread species are new arrivals that may replace endemics as human impacts increase.

  17. Diversity of the free-living marine and freshwater Copepoda (Crustacea) in Costa Rica: a review.

    Science.gov (United States)

    Morales-Ramírez, Álvaro; Suárez-Morales, Eduardo; Corrales-Ugalde, Marco; Garrote, Octavio Esquivel

    2014-01-01

    The studies on marine copepods of Costa Rica started in the 1990's and focused on the largest coastal-estuarine systems in the country, particularly along the Pacific coast. Diversity is widely variable among these systems: 40 species have been recorded in the Culebra Bay influenced by upwelling, northern Pacific coast, only 12 in the Gulf of Nicoya estuarine system, and 38 in Golfo Dulce, an anoxic basin in the southern Pacific coast of the country. Freshwater environments of Costa Rica are known to harbor a moderate diversity of continental copepods (25 species), which includes 6 calanoids, 17 cyclopoids and only two harpacticoids. Of the +100 freshwater species recorded in Central America, six are known only from Costa Rica, and one appears to be endemic to this country. The freshwater copepod fauna of Costa Rica is clearly the best known in Central America. Overall, six of the 10 orders of Copepoda are reported from Costa Rica. A previous summary by 2001 of the free-living copepod diversity in the country included 80 marine species (67 pelagic, 13 benthic). By 2009, the number of marine species increased to 209: 164 from the Pacific (49% of the copepod fauna from the Eastern Tropical Pacific) and 45 from the Caribbean coast (8% of species known from the Caribbean Basin). Both the Caribbean and Pacific species lists are growing. Additional collections of copepods at Cocos Island, an oceanic island 530 km away of the Pacific coast, have revealed many new records, including five new marine species from Costa Rica. Currently, the known diversity of marine copepods of Costa Rica is still in development and represents up to 52.6% of the total marine microcrustaceans recorded in the country. Future sampling and taxonomic efforts in the marine habitats should emphasize oceanic environments including deep waters but also littoral communities. Several Costa Rican records of freshwater copepods are likely to represent undescribed species. Also, the biogeographic relevance

  18. Diversity of the free-living marine and freshwater Copepoda (Crustacea in Costa Rica: a review

    Directory of Open Access Journals (Sweden)

    Alvaro Morales-Ramírez

    2014-11-01

    Full Text Available The studies on marine copepods of Costa Rica started in the 1990’s and focused on the largest coastal-estuarine systems in the country, particularly along the Pacific coast. Diversity is widely variable among these systems: 40 species have been recorded in the Culebra Bay influenced by upwelling, northern Pacific coast, only 12 in the Gulf of Nicoya estuarine system, and 38 in Golfo Dulce, an anoxic basin in the southern Pacific coast of the country. Freshwater environments of Costa Rica are known to harbor a moderate diversity of continental copepods (25 species, which includes 6 calanoids, 17 cyclopoids and only two harpacticoids. Of the +100 freshwater species recorded in Central America, six are known only from Costa Rica, and one appears to be endemic to this country. The freshwater copepod fauna of Costa Rica is clearly the best known in Central America. Overall, six of the 10 orders of Copepoda are reported from Costa Rica. A previous summary by 2001 of the free-living copepod diversity in the country included 80 marine species (67 pelagic, 13 benthic. By 2009, the number of marine species increased to 209: 164 from the Pacific (49% of the copepod fauna from the Eastern Tropical Pacific and 45 from the Caribbean coast (8% of species known from the Caribbean Basin. Both the Caribbean and Pacific species lists are growing. Additional collections of copepods at Cocos Island, an oceanic island 530 km away of the Pacific coast, have revealed many new records, including five new marine species from Costa Rica. Currently, the known diversity of marine copepods of Costa Rica is still in development and represents up to 52.6% of the total marine microcrustaceans recorded in the country. Future sampling and taxonomic efforts in the marine habitats should emphasize oceanic environments including deep waters but also littoral communities. Several Costa Rican records of freshwater copepods are likely to represent undescribed species. Also, the

  19. Periphyton changes over 20 years of chemical recovery of Lake Orta, Italy: differential response to perturbation of littoral and pelagic communities

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    Giuseppe MORABITO

    2011-08-01

    Full Text Available Lake Orta, a large Italian subalpine lake, has a long history of industrial pollution by acid, ammonia, and metals. A whole-lake liming treatment in 1989-1990 led to a gradual increase in pH (from 4.4 to 7 and a concomitant decline in ammonia (from 2.5 to 0.05 mg L-1 and metal concentrations (e.g., copper: from 35 to 3 μg L-1. In this study, we examine the response of the littoral zone, in terms of chemistry and periphyton assemblages, to contamination and recovery of Lake Orta. We compare these findings with a long-term data set of chemistry and phytoplankton collected in the pelagic zone. We sampled periphyton at two sites from the liming period (1989 through 2010 when the lake approached chemical equilibrium. Chemical variables collected in the littoral zone near the periphyton samples followed the same temporal trends observed in the pelagic zone. Chlorophytes, the dominant algae in the preliming period, progressively waned after the calcium carbonate addition. Diatom importance gradually increased to reach up to 80% of the total biovolume in the most recent years. There was a clear shift in the diatom taxonomic composition over the study period. Acidophilous Pinnularia subcapitata var. hilseana and metal-tolerant Achnanthes minutissima were dominant before liming. With the progressive increase in pH and decline in metal concentrations, there was successively the dominance of Fragilaria nanoides (formerly identified as Synedra tenera and Cymbella microcephala in the transition period and of circumneutral Navicula cryptocephala, N. radiosa, and Synedra ulna in the most recent period. Pelagic diatoms were more affected than benthic diatoms by the industrial pollution and their recovery after the liming intervention was slower. Whereas present periphyton diatom assemblages are similar to those observed in nearby unpolluted Lake Mergozzo, pelagic assemblages are still in transition from severe disturbance towards characteristics reported before

  20. Littoral landforms and pedosedimentary sequences indicating late Holocene lake-level changes in northern central Europe - A case study from northeastern Germany

    Science.gov (United States)

    Kaiser, Knut; Küster, Mathias; Fülling, Alexander; Theuerkauf, Martin; Dietze, Elisabeth; Graventein, Hagen; Koch, Paul Jörg; Bens, Oliver; Brauer, Achim

    2014-07-01

    A multidisciplinary study was carried out at Lake Großer Fürstenseer See (LFS) in order to explore the potential of littoral sediments, palaeosols and landforms as indicators of historical lake-level changes. This research was initiated to investigate the extent to which lakes in northern central Europe responded hydrologically to climatic and land-use changes in the last millennium. Specific landforms investigated comprise lake terraces, beach ridges, local basins/peatlands and dunes, revealing a wealth of sedimentary sub-environments at the lakeshore. Eleven sections were recorded with subsequent sedimentological-pedological, geochronological (OSL, 14C) and palaeobotanical (pollen, macro remains) analyses. Most of the pedosedimentary littoral sequences show a succession of basal glacial sand, intermediate palaeosols and lacustrine sand on top. A broader number of (semi-)terrestrial buried palaeosols along the lakeshore were systematically identified and analysed, providing evidence for changing hydrological conditions during the late Holocene. Additional historical data from the last centuries (e.g. maps, aerial photos, public records) allow the lake-levels reconstructed from geoarchives to be connected with modern gauging data. All local data sources available enable a tracing of lake level changes of the LFS during the last millennium, comprising periods of relatively low (c. 1200 AD, 2000s AD) and relatively high water levels (c. 1250-1450 AD, c. 1780 AD, 1980s AD). The amplitude of lake-level changes during the last c. 1000 years amounts to c. 3 m, so that the fluctuations of the last 30 years recorded by lake-level monitoring only reflect a small amount of the potential variability. Regional climate and local land-use history suggest that the Medieval lake-level dynamics of LFS were primarily governed by climate and secondarily influenced by human impact on the drainage system. At present the lake level is additionally influenced by the impact of highly

  1. Characterization of lake water and ground water movement in the littoral zone of Williams Lake, a closed-basin lake in North central Minnesota

    Science.gov (United States)

    Schuster, P.F.; Reddy, M.M.; LaBaugh, J.W.; Parkhurst, R.S.; Rosenberry, D.O.; Winter, T.C.; Antweiler, R.C.; Dean, W.E.

    2003-01-01

    Williams Lake, Minnesota is a closed-basin lake that is a flow-through system with respect to ground water. Ground-water input represents half of the annual water input and most of the chemical input to the lake. Chemical budgets indicate that the lake is a sink for calcium, yet surficial sediments contain little calcium carbonate. Sediment pore-water samplers (peepers) were used to characterize solute fluxes at the lake-water-ground-water interface in the littoral zone and resolve the apparent disparity between the chemical budget and sediment data. Pore-water depth profiles of the stable isotopes ??18O and ??2H were non-linear where ground water seeped into the lake, with a sharp transition from lake-water values to ground-water values in the top 10 cm of sediment. These data indicate that advective inflow to the lake is the primary mechanism for solute flux from ground water. Linear interstitial velocities determined from ??2H profiles (316 to 528 cm/yr) were consistent with velocities determined independently from water budget data and sediment porosity (366 cm/yr). Stable isotope profiles were generally linear where water flowed out of the lake into ground water. However, calcium profiles were not linear in the same area and varied in response to input of calcium carbonate from the littoral zone and subsequent dissolution. The comparison of pore-water calcium profiles to pore-water stable isotope profiles indicate calcium is not conservative. Based on the previous understanding that 40-50 % of the calcium in Williams Lake is retained, the pore-water profiles indicate aquatic plants in the littoral zone are recycling the retained portion of calcium. The difference between the pore-water depth profiles of calcium and ??18O and ??2H demonstrate the importance of using stable isotopes to evaluate flow direction and source through the lake-water-ground-water interface and evaluate mechanisms controlling the chemical balance of lakes. Published in 2003 by John Wiley

  2. Littoral Combat Ship (LCS)

    Science.gov (United States)

    2015-12-01

    Defense Switched Network EMD - Engineering and Manufacturing Development EVM - Earned Value Management FOC - Full Operational Capability FMS - Foreign...responses to small boat threats, mine laying and quiet diesel submarines. LCS employment of networked sensors for Intelligence, Surveillance, and...Flight 0 ships in addition to the program development, test and evaluation, training development, and sustained engineering for both LCS and Frigate

  3. Littoral Measurements Facility

    Data.gov (United States)

    Federal Laboratory Consortium — FUNCTION: Barny units measure ocean currents and sea surface heights on continental shelves and in ocean straits. SEPTR units are similar to Barnys but also record...

  4. Petalophthalmus papilloculatus sp. nov. (Crustacea: Mysida: Petalophthalmidae), a new bathyal suprabenthic mysid from the Galicia Bank (NE Atlantic Ocean).

    Science.gov (United States)

    Vicente, Carlos San; Frutos, Inmaculada; Cartes, Joan E

    2014-02-14

    A new species of the genus Petalophthalmus (Crustacea: Mysida: Petalophthalmidae) is described, based on specimens collected from the Galicia Bank (northeastern Atlantic Ocean). This species can be distinguished from the other species of the genus Petalophthalmus by the presence of an ocular papilla on its eyes. P. papilloculatus sp. nov. is morphologically close to the cosmopolitan species P. armiger Willemoes-Suhm, 1875, but can be easily distinguished by the presence of an ocular papilla, the longer antennal scales bearing an apical lobe, the unique chitinous ridge on the molar process, the outwards lengthening of the three cuspidate setae on the outer margin of the uropodal exopod and the armature of the telson. This new species lives on fine and very fine sandy bottoms at the bank flanks, between 1536 and 1809 m depths. Probably related to the special biogeographic characteristics of seamounts, the morphological affinity between the new species and P. armiger supports the hypothesis on a common ancestry and recent divergence between both deep sea mysids. An identification key to world species of Petalophthalmus is provided.

  5. A new late Eocene Bicornucythere species (Ostracoda, Crustacea) from Myanmar, and its significance for the evolutionary history of the genus.

    Science.gov (United States)

    Yamaguchi, Tatsuhiko; Suzuki, Hisashi; Soe, Aung-Naing; Htike, Thaung; Nomura, Ritsuo; Takai, Masanaru

    2015-02-17

    The ostracode genus Bicornucythere (Ostracoda, Crustacea) is abundant in modern-day eutrophic marine bays, and is widely distributed in estuaries and inner bays throughout East Asia, including in China, Korea, Japan, and the Russian Far East. The evolutionary history of Bicornucythere is poorly understood. Here, we report on a new species of Bicornucythere (Bicornucythere concentrica sp. nov.) from the upper Eocene Yaw Formation in the Central Myanmar Basin. The oldest previously known Bicornucythere taxon, Bicornucythere secedens, was reported from lower Miocene strata in India, although a molecular phylogeny suggests that the genus first appeared in the Late Cretaceous. Bicornucythere concentrica sp. nov. is at least 10.9 million years older than the earliest known B. secedens. The new species occurs with Ammonia subgranulosa, a benthic foraminifer, an association that is representative of brackish water conditions in modern Asian bays. Our findings indicate that extant genera have inhabited Asian bays since the late Eocene. The paleobiogeography of Bicornucythere indicates that the taxon was dispersed onto Indian coasts during the collision between the Indian and Eurasian plates.

  6. Prolonged feeding of terrestrial isopod (Porcellio scaber, Isopoda, Crustacea) on TiO (2) nanoparicles. Absence of toxic effect.

    Science.gov (United States)

    Novak, Sara; Drobne, Damjana; Menard, Anja

    2012-01-01

    Nanoparticles of titanium dioxide are one of most widely used nanomaterials in different products in everyday use and in industry, but very little is known about their effects on non- target cells and tissues. Terrestrial isopods were exposed to food dosed with nano-TiO(2) to give final nominal concentration 1000 and 2000 µg TiO(2)/g dry weight of food. The effects of ingested nano-TiO(2) on the model invertebrate Porcellio scaber (Isopoda, Crustacea) after short-term (3 and 7 days) and prolonged (14 and 28 days) dietary exposure was assessed by conventional toxicity measures such as feeding rate, weight change and mortality. Cell membrane destabilization was also investigated. No severe toxicity effects were observed after 3, 7, 14 or 28 days of dietary exposure to nano-TiO(2), but some animals, particularly those exposed to lower concentrations of nanoparticles, had severely destabilized digestive cell membranes. It was concluded that strong destabilization of the cell membrane was sporadic, and neither concentration- nor time-related. Further research is needed to confirm this sporadic toxic effect of nanoparticles.

  7. Prolonged feeding of terrestrial isopod (Porcellio scaber, Isopoda, Crustacea on TiO2 nanoparicles. Absence of toxic effect

    Directory of Open Access Journals (Sweden)

    Sara Novak

    2012-03-01

    Full Text Available Nanoparticles of titanium dioxide are one of most widely used nanomaterials in different products in everyday use and in industry, but very little is known about their effects on non- target cells and tissues. Terrestrial isopods were exposed to food dosed with nano-TiO2 to give final nominal concentration 1000 and 2000 µg TiO2/g dry weight of food. The effects of ingested nano-TiO2 on the model invertebrate Porcellio scaber (Isopoda, Crustacea after short-term (3 and 7 days and prolonged (14 and 28 days dietary exposure was assessed by conventional toxicity measures such as feeding rate, weight change and mortality. Cell membrane destabilization was also investigated. No severe toxicity effects were observed after 3, 7, 14 or 28 days of dietary exposure to nano-TiO2, but some animals, particularly those exposed to lower concentrations of nanoparticles, had severely destabilized digestive cell membranes. It was concluded that strong destabilization of the cell membrane was sporadic, and neither concentration- nor time-related. Further research is needed to confirm this sporadic toxic effect of nanoparticles.

  8. Linkage of biomarkers along levels of biological complexity in juvenile and adult diazinon fed terrestrial isopod (Porcellio scaber, Isopoda, Crustacea).

    Science.gov (United States)

    Stanek, Katja; Drobne, Damjana; Trebse, Polonca

    2006-09-01

    In parallel laboratory experiments, we determined the effect of a typical representative of organophosphorous pesticides, diazinon, on AChE activity, lipid, protein and glycogen content, weight change, feeding activity and mortality of juvenile and adult terrestrial isopods Porcellio scaber (Isopoda, Crustacea). Organophosphorous pesticides (OP) are among the most extensively used pesticides, which have replaced organochlorine pesticides. OPs inhibit the enzyme acetylcholinesterase (AChE), resulting in neurotoxicity. They have more widespread effects on non-target organisms than do organochlorine pesticides. The aim of this study was to link effect of diazinon on target enzyme to energy reserves and to integrated biomarker responses in juvenile and adult P. scaber. The non-observed effect concentration (NOEC) for AChE activity after diazinon exposure in two weeks toxicity study with isopods was below 5 microg/g diazinon. There was a good agreement between concentrations at which AChE and survival were affected (10 microg/g diazinon in juveniles, 100 microg/g diazinon in adults). We revealed a link among AChE activity, protein content and mortality. Glycogen and lipid content, feeding activity and weight change were not affected in two weeks diazinon exposure up to 100 microg/g diazinon. Juveniles were affected at concentrations that were an order of magnitude lower than those provoking similar effects on adults. Recommendations are made for future toxicity studies with terrestrial isopods.

  9. "Candidatus Bacilloplasma," a novel lineage of Mollicutes associated with the hindgut wall of the terrestrial isopod Porcellio scaber (Crustacea: Isopoda).

    Science.gov (United States)

    Kostanjsek, Rok; Strus, Jasna; Avgustin, Gorazd

    2007-09-01

    Pointed, rod-shaped bacteria colonizing the cuticular surface of the hindgut of the terrestrial isopod crustacean Porcellio scaber (Crustacea: Isopoda) were investigated by comparative 16S rRNA gene sequence analysis and electron microscopy. The results of phylogenetic analysis, and the absence of a cell wall, affiliated these bacteria with the class Mollicutes, within which they represent a novel and deeply branched lineage, sharing less than 82.6% sequence similarity to known Mollicutes. The lineage has been positioned as a sister group to the clade comprising the Spiroplasma group, the Mycoplasma pneumoniae group, and the Mycoplasma hominis group. The specific signature sequence was identified and used as a probe in in situ hybridization, which confirmed that the retrieved sequences originate from the attached rod-shaped bacteria from the hindgut of P. scaber and made it possible to detect these bacteria in their natural environment. Scanning and transmission electron microscopy revealed a spherically shaped structure at the tapered end of the rod-shaped bacteria, enabling their specific and exclusive attachment to the tip of the cuticular spines on the inner surface of the gut. Specific adaptation to the gut environment, as well as phylogenetic positioning, indicate the long-term association and probable coevolution of the bacteria and the host. Taking into account their pointed, rod-shaped morphology and their phylogenetic position, the name "Candidatus Bacilloplasma" has been proposed for this new lineage of bacteria specifically associated with the gut surface of P. scaber.

  10. Bioaccumulation in Porcellio scaber (Crustacea, Isopoda) as a measure of the EDTA remediation efficiency of metal-polluted soil

    Energy Technology Data Exchange (ETDEWEB)

    Udovic, Metka [Centre for Soil and Environmental Science, Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, Sl-1000 Ljubljana (Slovenia); Drobne, Damjana [Department of Biology, Biotechnical Faculty, University of Ljubljana, Vecna pot 111, SI-1000 Ljubljana (Slovenia); Lestan, Domen, E-mail: domen.lestan@bf.uni-lj.s [Centre for Soil and Environmental Science, Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, Sl-1000 Ljubljana (Slovenia)

    2009-10-15

    Leaching using EDTA applied to a Pb, Zn and Cd polluted soil significantly reduced soil metal concentrations and the pool of metals in labile soil fractions. Metal mobility (Toxicity Characteristic Leaching Procedure), phytoavailability (diethylenetriaminepentaacetic acid extraction) and human oral-bioavailability (Physiologically Based Extraction Test) were reduced by 85-92%, 68-91% and 88-95%, respectively. The metal accumulation capacity of the terrestrial isopod Porcellio scaber (Crustacea) was used as in vivo assay of metal bioavailability, before and after soil remediation. After feeding on metal contaminated soil for two weeks, P. scaber accumulated Pb, Zn and Cd in a concentration dependent manner. The amounts of accumulated metals were, however, higher than expected on the basis of extraction (in vitro) tests. The combined results of chemical extractions and the in vivo test with P. scaber provide a more relevant picture of the availability stripping of metals after soil remediation. - Bioaccumulation tests with Porcellio scaber isopods are proposed as a supplement to chemical extraction in assessing metal bioavailability before and after soil remediation.

  11. Behavioural and Physiological Implications of a Burrow-dwelling Lifestyle for Two Species of Upogebiid Mud-shrimp (Crustacea: Thalassinidea)

    Science.gov (United States)

    Astall, C. M.; Taylor, A. C.; Atkinson, R. J. A.

    1997-02-01

    Upogebia stellataand U. deltaura(Crustacea: Thalassinidea) construct burrows in nearshore sediments in U.K. waters. Burrow structure is similar in both species; the basic burrow consisting of a two-opening, U-shaped section with a vertical shaft descending from the mid-point of the U. This structure may be variously elaborated. Burrow cross-section is circular, dilations allow turning by somersaulting and surface openings are often constricted. Conditions within the burrows are usually hypoxic and hypercapnic. Burrow water PO 2in the parts normally occupied by the mud-shrimp was between 80-110 Torr, but was much lower (10-45 Torr) in the deepest, poorly-irrigated parts. Both species irrigate their burrows by episodes of pleopod beating of variable duration (mean=8·5±3·5 min and 2·8±0·5 min for U. deltauraand U. stellata, respectively), which draws oxygenated water into the burrow and also particulate food for suspension feeding. When exposed to hypoxia, U. deltauraand U. stellatawere able to maintain their rates of oxygen consumption approximately constant over a wide range of PO 2( Pc=30-50 Torr). Under these conditions, there was a pronounced increase in scaphognathite beat rate but heart rate remained relatively constant. Below the Pc, however, both rates declined.

  12. Crustacea Decapoda captured through a passive collection in a stretch of Rio dos Mangues (Porto Seguro – Bahia – Brazil

    Directory of Open Access Journals (Sweden)

    Rafael Ribeiro Teixeira

    2012-11-01

    Full Text Available This paper aimed to carry out, through passive collection, a survey of Crustacea Decapoda species present in a stretch of Rio dos Mangues (Porto Seguro – Bahia – Brazil, during spring season of 2009. The collections were carried out in five sites, distributed over the final 10km of the river, using traps containing biological bait left underwater for 15h. To assess the abiotic variables, temperature, pH, and conductivity values were measured. A total of 135 individuals was registered, belonging to three species: the shrimps Macrobrachium acanthurus (Wiegmann, 1836 and M. olfersi (Wiegman, 1836, besides the crab Trichodactylus fluviatilis Latreille, 1828. In addition to these, two other crab species were collected: Goniopsis cruentata (Latreille, 1803 and Panopeus lacustris Desbonne, 1867. The highest values were registered in P4 (34.07% of individuals, P1 (23.70%, and P3 (22.96%. Temperature and pH presented a small variation throughout the analyses (respectively, 5.1-5.8 and 25.7-29.1°C. In turn, conductivity differed the estuary point (P5 from the other ones (respectively, 886mS and 41-48mS. No individual was registered in P2. The distribution of species was related to the type of microhabitat and the habit of each of them.

  13. The effect of starvation and re-feeding on mitochondrial potential in the midgut of Neocaridina davidi (Crustacea, Malacostraca)

    Science.gov (United States)

    Włodarczyk, Agnieszka; Sonakowska, Lidia; Kamińska, Karolina; Marchewka, Angelika; Wilczek, Grażyna; Wilczek, Piotr; Student, Sebastian; Rost-Roszkowska, Magdalena

    2017-01-01

    The midgut in the freshwater shrimp Neocaridina davidi (previously named N. heteropoda) (Crustacea, Malacostraca) is composed of a tube-shaped intestine and a large hepatopancreas that is formed by numerous blind-ended tubules. The precise structure and ultrastructure of these regions were presented in our previous papers, while here we focused on the ultrastructural changes that occurred in the midgut epithelial cells (D-cells in the intestine, B- and F- cells in the hepatopancreas) after long-term starvation and re-feeding. We used transmission electron microscopy, light and confocal microscopes and flow cytometry to describe all of the changes that occurred due to the stressor with special emphasis on mitochondrial alterations. A quantitative assessment of cells with depolarized mitochondria helped us to establish whether there is a relationship between starvation, re-feeding and the inactivation/activation of mitochondria. The results of our studies showed that in the freshwater shrimp N. davidi that were analyzed, long-term starvation activates the degeneration of epithelial cells at the ultrastructural level and causes an increase of cells with depolarized (non-active) mitochondria. The process of re-feeding leads to the gradual regeneration of the cytoplasm of the midgut epithelial cells; however, these changes were observed at the ultrastructural level. Additionally, re-feeding causes the regeneration of mitochondrial ultrastructure. Therefore, we can state that the increase in the number of cells with polarized mitochondria occurs slowly and does not depend on ultrastructural alterations. PMID:28282457

  14. Beach sediments drift study by means of radioactive tracers; L'etude du transport littoral par la methode des traceurs radioactifs

    Energy Technology Data Exchange (ETDEWEB)

    Hours, R. [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires; Jaffry, P. [Electricite de France (EDF), 78 - Chatou (France). Lab. National d' Hydraulique

    1959-07-01

    The present state of the sediments drift studies by means of radioactive tracers is exposed. Various processes of labelling, immersion and detection, used in France and other countries, are reviewed. A more extended analysis of some aspects of the problem by the same authors can be found in 'La Houille Blanche', number 3, may-june 1959 (Rapport C.E.A. number 1269). (author) [French] L'etude du transport littoral des sediments et galets par la methode des traceurs radioactifs est en plein developpement. Le present rapport precise l'etat actuel de la question. Les techniques de marquage, d'immersion et de detection utilisees en France et a l'etranger sont decrites; une analyse plus detaillee de certains aspects de la question est presentee par les memes auteurs dans 'La Houille Blanche', numero 3, mai-juin 1959 (Rapport C.E.A. numero 1269). (auteur)

  15. A Comparative Study of Antioxidant Enzymes Activity to Heat Shock in Amphipods Gmelinoides fasciatus of Littoral Community of Lake Baikal and Thermal Springs

    Directory of Open Access Journals (Sweden)

    Lubyaga Y.A.

    2016-11-01

    Full Text Available The aim of the current study was to comparative assessment of the antioxidant enzymes activity (peroxidase, catalase, glutathione S-transferase in endemic species Gmelinoides fasciatus (Stebbing, 1899 inhabitants of the littoral community of the Lake Baikal and the thermal spring under short term thermal stress. It was shown, that the exposure of G. fasciatus from different areas to acute temperature stress didn’t lead to changes in the activities of three key enzymes of the antioxidant system. However, it was found that the activity of glutathione S-transferase in the control animals of thermal springs population is higher than in animals of Lake Baikal. This can be determined by peculiarities of environment of different populations.

  16. Optimisation de la gestion de la route du littoral à la Réunion vis-à-vis du risque de chutes de blocs

    OpenAIRE

    Rat, M.

    2006-01-01

    La route du littoral à deux fois deux voies sur l'île de la Réunion est située, sur une longueur de treize kilomètres, au pied d'une falaise atteignant deux cents mètres de haut. Il a été nécessaire de définir des règles de gestion de cette route pour diminuer le risque lié aux chutes de blocs. La règle actuelle (fermeture de la chaussée côté amont la plus exposée pendant trois jours si la pluie dépasse quinze millimètres en vingt-quatre heures) est devenue très pénalisante, compte tenu de l'...

  17. Amorosia littoralis gen. sp. nov., a new genus and species name for the scorpinone and caffeine-producing hyphomycete from the littoral zone in The Bahamas.

    Science.gov (United States)

    Mantle, Peter G; Hawksworth, David L; Pazoutova, Sylvie; Collinson, Lucy M; Rassing, Birgitte R

    2006-12-01

    The new generic and species name Amorosia littoralis gen. sp. nov. is introduced for the conidial dematiaceous hyphomycete isolated from the littoral zone in The Bahamas and reported in 2001 to produce the novel aza-anthraquinone scorpinone, and also caffeine. No satisfactory generic placement was found at the time, but subsequent morphological and molecular investigations reveal that a new generic name is required. The new genus has some similarity to several fungi described in Trichocladium, but differs substantially from the type species of that genus in the form of the conidia and the lack of ornamentation. BLAST studies using the 18S and 28S rDNA gene sequences place the new genus in the Sporormiaceae. In addition to the morphological studies, an ultrastructural examination of the conspicuous porate septa of hyphae showed that they do not belong to a basidiomycete.

  18. Persistent thrombocytopaenia in a young man with splenomegaly, rebound thrombocytosis after splenectomy and subsequent pulmonary embolism: splenic littoral cell angioma and associated events.

    Science.gov (United States)

    de Ridder, Gustaaf Gregoire; Galeotti, Jonathan; Carney, John; Wang, Endi

    2015-11-24

    Littoral cell angioma (LCA) is a rare endothelial cell neoplasm in the spleen. Although many cases of LCA are asymptomatic, some present with signs and symptoms related to splenomegaly, whereas others manifest with haematological abnormalities, including anaemia and/or thrombocytopaenia (ie, hypersplenism). We report a case of LCA presenting with chronic thrombocytopaenia, probably due to splenic sequestration of platelets or phagocytosis of platelets by neoplastic cells. Following therapeutic splenectomy, the patient suffered from a marked rebound thrombocytosis and subsequently developed pulmonary embolisms. He was treated with anticoagulant therapy combined with antiplatelet therapy, and his symptoms were quickly resolved. This case emphasises an exclusion of primary splenic disorders in patients with chronic thrombocytopaenia, especially in those with splenomegaly and the contemplation of thromboembolism prophylaxis postsplenectomy. 2015 BMJ Publishing Group Ltd.

  19. 脾窦岸细胞血管瘤诊治的研究进展%Advances in Diagnosis and Treatment of Littoral Cell Angioma in Spleen

    Institute of Scientific and Technical Information of China (English)

    李加美

    2011-01-01

    Littoral cell angioma(LCA)is a benign tumor which origins from splenic sinus-lining cells (littoral cells).LCA is a rare disease and mostly reported as case report in literatures. LCA is often misdiag-nosed as other conditions before operation because of the low the incidence, atypical clinical characteristics and non-specific imaging manifestations. Splenectomy is the main treatment for LCA currently. The reported cases of LCA see an increase in recent years,with the aim of improving the knowledge level of LCA,here is to review on the studies on the clinical, imaging and histopathological diagnosis and identification diagnosis.%脾窦岸细胞血管瘤(LCA)是发生于脾脏窦岸细胞的一种良性肿瘤.因本病少见,文献中多为个案报道,临床及病理医师对其认识不足,且影像学检查也缺乏特异性改变.因此,术前极易被误诊为脾脏其他病变.脾脏切除是目前治疗LCA的主要手段.近年来,有关LCA的病例报道逐渐增多,为提高对本病的认识,现对LCA临床、影像学及病理组织学诊断与鉴别诊断方面的相关研究予以综述.

  20. Cascading effects of predatory fish exclusion on the detritus-based food web of a lake littoral zone (Lake Vico, central Italy).

    Science.gov (United States)

    Mancinelli, G; Costantini, M; Rossi, L

    2002-11-01

    An exclosure experiment was carried out in the reed-dominated littoral zone of a volcanic lake (Lake Vico, central Italy) to test whether the impact of predatory fish on benthic invertebrates cascades on fungal colonisation and breakdown of leaf detritus. The abundance, biomass, and Shannon diversity index of the invertebrate assemblage colonising Phragmites australis leaf packs placed inside: (1) full-exclosure cages, (2) cages allowing access only to small-sized fish predators, and (3) cageless controls, were monitored over a 45-day period together with the mass loss and associated fungal biomass of leaf packs. The species composition of the fungal assemblage was further assessed at the end of the manipulation. In general, invertebrate predators did not show any significant response to fish exclusion, either on a trophic guild or on a single taxon level. In contrast, the exclusion of large predatory fish induced a diverse spectrum of changes in the abundance and population size-structure of dominant detritivore taxa, ultimately increasing the biomass and Shannon diversity index of the whole detritivorous guild. These changes corresponded with significant variations in leaf detritus decay rates as well as in the biomass and assemblage structure of associated fungal colonisers. Our experimental findings provide evidence that in Lake Vico effects of fish predators on invertebrate detritivores influence the fungal conditioning and breakdown of the detrital substrate. We conclude that in lacustrine littoral zones predator-driven constraints may structure lower trophic levels of detritus-based food webs and affect the decomposition of leaf detritus originated from the riparian vegetation.

  1. Testing the potential of DNA barcoding in vertebrate radiations: the case of the littoral cichlids (Pisces, Perciformes, Cichlidae) from Lake Tanganyika.

    Science.gov (United States)

    Breman, Floris C; Loix, Sara; Jordaens, Kurt; Snoeks, Jos; Van Steenberge, Maarten

    2016-11-01

    We obtained 398 cytochrome c oxidase subunit I barcodes of 96 morphospecies of Lake Tanganyika (LT) cichlids from the littoral zone. The potential of DNA barcoding in these fishes was tested using both species identification and species delineation methods. The best match (BM) and best close match (BCM) methods were used to evaluate the overall identification success. For this, three libraries were analysed in which the specimens were categorized into Operational Taxonomic Units (OTU) in three alternative ways: (A) morphologically distinct, including undescribed, species, (B) valid species and (C) complexes of morphologically similar or closely related species. For libraries A, B and C, 73, 73 and 96% (BM) and 72, 70 and 94% (BCM) of the specimens were correctly identified. Additionally, the potential of two species delineation methods was tested. The General Mixed Yule Coalescent (GMYC) analysis suggested 70 hypothetical species, while the Automatic Barcode Gap Discovery (ABGD) method revealed 115 putative species. Although the ABGD method had a tendency to oversplit, it outperformed the GMYC analysis in retrieving the species. In most cases where ABGD suggested oversplitting, this was due to intraspecific geographical variation. The failure of the GMYC method to retrieve many species could be attributed to discrepancies between mitochondrial gene trees and the evolutionary histories of LT cichlid species. Littoral LT cichlids have complex evolutionary histories that include instances of hybridization, introgression and rapid speciation. Nevertheless, although the utility of DNA barcoding in identification is restricted to the level of complexes, it has potential for species discovery in cichlid radiations. © 2016 John Wiley & Sons Ltd.

  2. Littoral fish assemblages of the alien-dominated Sacramento-San Joaquin Delta, California, 1980-1983 and 2001-2003

    Science.gov (United States)

    Brown, L.R.; Michniuk, D.

    2007-01-01

    We analyzed monthly boat electrofishing data to characterize the littoral fish assemblages of five regions of the Sacramento-San Joaquin Delta (northern, southern, eastern, western, and central), California, during two sampling periods, 1980-1983 (1980s) and 2001-2003 (2000s), to provide information pertinent to the restoration of fish populations in this highly altered estuary. During the 1980s, almost 11,000 fish were captured, including 13 native species and 24 alien species. During the 2000s, just over 39,000 fish were captured, including 15 native species and 24 alien species. Catch per unit effort (CPUE) of total fish, alien fish, and centrarchid fish were greater in the 2000s compared with the 1980s, largely because of increased centrarchid fish CPUE. These differences in CPUE were associated with the spread of submerged aquatic vegetation (SAV), particularly an alien aquatic macrophyte Egeria densa. Native fish CPUE declined from the 1980s to the 2000s, but there was no single factor that could explain the decline. Native fish were most abundant in the northern region during both sampling periods. Nonmetric multidimensional scaling indicated similar patterns of fish assemblage composition during the two sampling periods, with the northern and western regions characterized by the presence of native species. The separation of the northern and western regions from the other regions was most distinct in the 2000s. Our results suggest that native fish restoration efforts will be most successful in the northern portion of the Delta. Management decisions on the Delta should include consideration of possible effects on SAV in littoral habitats and the associated fish assemblages and ecological processes. ?? 2007 Estuarine Research Federation.

  3. Muscle precursor cells in the developing limbs of two isopods (Crustacea, Peracarida): an immunohistochemical study using a novel monoclonal antibody against myosin heavy chain.

    Science.gov (United States)

    Kreissl, S; Uber, A; Harzsch, S

    2008-05-01

    In the hot debate on arthropod relationships, Crustaceans and the morphology of their appendages play a pivotal role. To gain new insights into how arthropod appendages evolved, developmental biologists recently have begun to examine the expression and function of Drosophila appendage genes in Crustaceans. However, cellular aspects of Crustacean limb development such as myogenesis are poorly understood in Crustaceans so that the interpretative context in which to analyse gene functions is still fragmentary. The goal of the present project was to analyse muscle development in Crustacean appendages, and to that end, monoclonal antibodies against arthropod muscle proteins were generated. One of these antibodies recognises certain isoforms of myosin heavy chain and strongly binds to muscle precursor cells in malacostracan Crustacea. We used this antibody to study myogenesis in two isopods, Porcellio scaber and Idotea balthica (Crustacea, Malacostraca, Peracarida), by immunohistochemistry. In these animals, muscles in the limbs originate from single muscle precursor cells, which subsequently grow to form multinucleated muscle precursors. The pattern of primordial muscles in the thoracic limbs was mapped, and results compared to muscle development in other Crustaceans and in insects.

  4. Using field data to assess the effects of pesticides on crustacea in freshwater aquatic ecosystems and verifying the level of protection provided by water quality guidelines.

    Science.gov (United States)

    Guy, Martha; Singh, Lucina; Mineau, Pierre

    2011-07-01

    The purpose of this study was to investigate how well single-species laboratory data predict real-world pesticide toxicity effects on Crustacea. Data from field pesticide exposures from experimental mesocosm and small pond studies were converted into toxicity units (TUs) by dividing measured pesticide concentrations by the L(E)C50 for Daphnia or acute 5% hazard concentration for Crustacea (HC5-C). The proportion of crustacean taxa significantly affected by the pesticide treatment, called the count ratio of effect, was used in logistic regression models. Of 200 possible logistic model combinations of the TUs, fate, physicochemical variables, and structural variables versus the count ratio of effect for the mesocosm data, the best model was found to incorporate log(TU HC5-C). This model was used to convert pesticide water quality guidelines from around the world into estimates of the proportion of crustacean taxa predicted to be impacted by exposure to a pesticide at the water quality guideline concentration. This analysis suggests 64% of long-term water quality guidelines and 88% of short-term pesticide water quality guidelines are not protective of the aquatic life they are designed to protect. We conclude that empirically derived data from mesocosm studies should be incorporated into water quality guideline derivation for pesticides where available. Also, interspecific differences in susceptibility should be accounted for more accurately to ensure water quality guidelines are adequately protective against the adverse effects of pesticide exposure. Copyright © 2011 SETAC.

  5. Distribution, diversity and ecology of modern freshwater ostracodes (Crustacea, and hydrochemical characteristics of Lago Petén Itzá, Guatemala

    Directory of Open Access Journals (Sweden)

    Burkhard SCHARF

    2010-02-01

    Full Text Available We analyzed modern ostracode species assemblages and water column physico-chemical characteristics in Lago Péten Itzá, Guatemala. Lake waters are dominated by sulfate, bicarbonate, calcium and magnesium and display a total ion concentration of ~11 meq L-1. Eleven extant ostracode species were identified. We found higher abundances of living ostracodes, as well as relatively higher species richness (eight species and biodiversity (H of 1.6 between the littoral zone and a water depth of 20 m. At water depths >40 m, these variables all decreased. The thermocline is located at a water depth of ~20-40 m. Cluster analysis revealed three water depth ranges in the lake of importance to ostracode distribution: 1 littoral zone (0.1-3 m, 2 water depths from the base of the littoral zone to the base of the thermocline (3-40 m, and 3 water depths below the thermocline (40-160 m. The assemblage "Darwinula-Heterocypris-Pseudocandona-Strandesia" is characteristic of waters 40 m. Ostracode taxa from Lago Petén Itzá show specific ecological preferences related to water depth and associated physico-chemical characteristics, thus illustrating the potential of ostracodes as indicators of lake level changes and hydrodynamics.

  6. Le domaine margino-littoral du Bénin (Golfe de Guinée - Afrique de l'Ouest): âge holocène et mise en place marine des ``Sables jaunes''

    Science.gov (United States)

    Lang, J.; Paradis, G.; Oyede, M.

    The formation "Sables jaunes" occurs along the littoral margin of the Benin. Their age, determined by means of Carbon 14, is comprised between 19573 ± 500 BP (DAK 207) and 2674 ± 120 BP (DAK 199). Their morphological and sedimentological characteristics lead to regard them as resulting from a marine sedimentation, then followed by an eolian reworking which affects only the upper part of the Sands.

  7. Grandes branquiópodos (Crustacea, Branchiopoda, Anostraca, Notostraca en la provincia de Málaga, España (año hidrológico 2012/2013

    Directory of Open Access Journals (Sweden)

    Ripoll Rodríguez, J.

    2014-03-01

    Full Text Available Large branchiopods (Crustacea, Branchiopoda, Anostraca, Notostraca from Málaga province, Spain (2012/2013 hydrological year This paper presents the occurrence of the large branchiopods detected during a survey carried out in the province of Málaga (Andalusia, southern Spain. Five species (Branchipus cortesi, Chirocephalus diaphanus, Streptocephalus torvicornis, Triops mauritanicus aggr. and Phallocryptus spinosa were recorded at 90 sampled wetlands.

  8. Investigation of UAS-based SfM Photogrammetry and Bathymetric Inversion for Mapping a Shallow Water, Low-energy Littoral Zone

    Science.gov (United States)

    Starek, M. J.

    2016-02-01

    Small-scale Unmanned Aircraft Systems (UAS) enable the integration of light weight, low-cost imaging payloads providing a flexible and efficient means for conducting localized littoral surveys. Through exploitation of high imagery overlap and minimal aiding technology, photogrammetric techniques and structure from motion (SfM) methods can be applied to derive accurate 2D and 3D geospatial data about the observed terrain. Furthermore, small-scale UAS enable rapid response capabilities and provide the potential for collecting repeated observations at high temporal frequency making them an exceptional tool for monitoring dynamic coastal environments. This study examines the accuracy of topographic and bathymetric data derived from a UAS-based photogrammetric survey of a low-energy, shallow-water littoral zone. The study site is, an engineered and restored beach, located on Ward Island in Corpus Christi Bay, TX. Two UAS surveys were conducted roughly two months apart using a system called the SenseFly eBee. The eBee is an ultra-lightweight ( 0.7 kg) fully autonomous platform and it was equipped with a 16 megapixel RGB camera. The objectives were to: (1) assess accuracy differences in SfM derived point clouds over exposed and submerged beach; (2) evaluate effects of scene-to-scene variability and flight design on derived data products. Several key components were analyzed in order to assess the accuracy and usefulness of elevation data derived from the UAS/SfM approach. First, a sensitivity analysis was conducted to examine the impacts of image scale and match constraints on the fidelity of 3D point cloud data derived from the SfM processing workflow. Evaluation focused on differences in accuracy and density of point data over exposed and submerged beach. Second, a noise filter was developed to remove non-subtrate returns from the SfM cloud for bathymetric modeling. Finally, a bathymetric inversion approach was applied to derive an estimate of water depth. Results show

  9. Effect of nitrogen fertilization on the activity and diversity of methane oxidising bacteria in the littoral zone of a boreal lake

    Science.gov (United States)

    Saari, A.; Siljanen, H. M. P.; Hämäläinen, S.; Bodrossy, L.; Martikainen, P. J.

    2009-04-01

    Freshwater lakes are generally net sources of CH4 and in boreal lakes a major part of the CH4 emissions originates from the littoral zone during the ice-free season. Aerobic CH4 oxidising bacteria, methanotrophs, significantly limit the flux of CH4 to the atmosphere from sediments. Increased N load causes eutrophication and subsequent anoxia, which probably enhances CH4 production. In addition, inorganic nitrogen (ammonium and nitrate) can inhibit CH4 oxidation. Our study belongs to the research consortium METHECO (Eurodiversity programme of European Science Foundation), where the activity and diversity of methane oxidising bacteria are studied in various European ecosystems. We studied with in situ manipulation the effects of eutrophication (added nitrogen) on the activity and diversity of methanotrophs in a littoral wetland of a small and shallow hyper-eutrophic lake in east-central Finland. We established in the area growing sedges (7-10 m from the shore line) three sampling plots (1.2 m x 1.2 m), which were irrigated four times (from 4th July to 9th August) with ammonium nitrate solution giving 10 g N m-2for the total additional nitrogen load during the growing season. Three control plots were irrigated with equivalent amount of distilled water. The amount of added ammonium nitrate solution or water did not exceed 10% of the long-term (30 years) average rainfall in the area during the growing season. Sediment samples were taken from the depths of 0-2 cm, 2-10cm, 10-20 cm and 20-30 cm before, during and after the N treatment. Methane oxidation potential was studied in 550-ml flasks with sediment slurries and initial headspace CH4 concentration of 0.1%. The diversity of methanotrophs was studied with pmoA-microarray. Methane oxidation was most active in the organic surface sediment layer of 0-10 cm and the activity decreased with depth. Nitrogen addition in situ did not affect significantly the potential CH4 oxidation rates, although nitrate inhibited CH4

  10. Spatial patterns of Pisidium chilense (Mollusca Bivalvia and Hyalella patagonica (Crustacea, Amphipoda in an unpolluted stream in Navarino island (54° S, Cape Horn Biosphere Reserve

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    Patricio De Los Ríos Escalante

    2017-01-01

    Full Text Available The southern South American inland waters have many endemic species and some of them are considered as endangered for IUCN, that inhabits in unpolluted ecosystems, one of these ecosystems are the sub-Antarctic perennial forests located in the Cape Horn Biosphere Reserve at 54° S. The aim of the present study is to analyze the spatial patterns of Pisidium chilense Ituarte, 1999 (Mollusca Bivalvia and Hyalella patagonica (Cunningham, 1871 (Crustacea, Amphipoda in an unpolluted stream. Both species had aggregated spatial distribution, both have a negative binomial distribution pattern, and both are associated. The present results would agree with similar patterns in Patagonian rivers where both species coexist.

  11. First inventory of the Crustacea (Decapoda, Stomatopoda) of Juan de Nova Island with ecological observations and comparison with nearby islands in the Mozambique channel (Europa, Glorieuses, Mayotte)

    Science.gov (United States)

    Poupin, J.

    2016-04-01

    Crustacea Decapoda and Stomatopoda are inventoried for the first time in Juan de Nova Island, Iles Eparses, Mozambique channel. In total, 112 species are reported: 69 crabs, 28 anomurans, 11 shrimps, 3 mantis shrimps and 1 lobster. A comparison is made with nearby islands in the Mozambique channel: Glorieuses Islands (157 species), Europa Island (178 species), and Mayotte Island (505 species). The lower species richness at Juan de Nova is explained by the small size of the island and by the difficulties to collect the crustaceans on the reef flat hardly accessible at low tide. The crustaceans are listed by main habitats from land to outer reef (2-20 m). The presence of the coconut crab (Birgus latro), an endangered species vulnerable to human predation, is confirmed.

  12. A new species of Cletocamptus Schmankewitsch, 1875 (Crustacea, Copepoda, Harpacticoida from a high altitude saline lake in Central Mexico

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    Eduardo Suarez Morales

    2013-04-01

    Full Text Available During the analysis of littoral samples collected from a high-altitude saline crater lake in Central Mexico, several female and male specimens of harpacticoid copepods were recovered and taxonomically examined. They were found to represent an undescribed species of the canthocamptid genus Cletocamptus Schmankewitsch, 1875. The new species, C. gomezi n. sp. is described herein based on specimens of both sexes. It resembles C. stimpsoni Gómez, Fleeger, Rocha-Olivares and Foltz, 2004 from Louisiana but also C. trichotus Kiefer, 1929. The new species differs from C. stimpsoni and from other congeners by details of the maxillular armature, the setation of the endopodal segments of legs 2 and 3, and the armature of the third exopodal segment of legs 3 and 4. Also, the dorsal (VII and the outer (IV caudal setae are both relatively shorter than in C. stimpsoni. This is the second species of the genus known to be distributed in Mexico. The occurrence of the new species in a high-altitude saline lake, the isolation of the type locality, and its absence from adjacent freshwater lakes suggest that this species is endemic to this site.

  13. Faunal diversity of Cladocera (Crustacea: Branchiopoda in wetlands of Majuli (the largest river island, Assam, northeast India

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    Sharma, B. K.

    2014-06-01

    Full Text Available Our collections from the wetlands of Majuli, the largest river island of the world and a unique fluvial landform of the Brahmaputra river basin of northeast India, reveal 55 Cladocera species belonging to 36 genera. These represent ~46.0% and ~79.0% of the freshwater species and genera of the taxon known from India, respectively. The Indo-Chinese Alona kotovi is new record from India and the Indo-Chinese Chydorus angustirostris is new to northeast India. The Australasian Disperalona caudata, the Indo-Chinese Alona cheni, and the Oriental Celsinotum macronyx and Kurzia (Rostrokurzia brevilabris are other biogeographically notable elements while several species are of regional interest. The speciose and diverse Cladocera reflect habitat diversity and environmental heterogeneity of the sampled ecosystems. The fauna records rich diversity of the littoral-periphytonic taxa in general and the Chydoridae in particular. Majuli Cladocera is characterized by lack of Leydigiopsis, Daphnia spp. and Acroperus harpae; fewer Diaphanosoma spp., and uncommon occurrence of the Bosminidae and Moinidae as compared with our samples elsewhere from the floodplains of the Brahmaputra basin.

  14. A note on the occurrence of praniza larvae of Gnathiidae (Crustacea, Isopoda on fishes from Northeast of Pará, Brazil

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    Daniel G. Diniz

    2008-12-01

    Full Text Available The infection of the estuarine teleost fishes Mugil gaimardianus Desmarest, 1831 (Mugilidae, Arius phrygiatus Valenciennes, 1839 (Ariidae, Conodon nobilis Linnaeus, 1759 (Haemulidae, Cetengraulis edentulus Cuvier, 1829 (Engraulidae, and Anableps anableps Linnaeus, 1758 (Anablepidae by praniza larvae of Gnathiidae (Crustacea, Isopoda was studied in specimens fished off the Atlantic Ocean in Northeast of Pará State, near Bragança, Brazil. The highest infection prevalence value was found in Anableps anableps (42.3% and the lowest in Conodon nobilis (9.1%. The mean intensity varied from 1 parasitein Conodon nobilis to 19.5 in Arius phrygiatus. A description of the larvae is provided. The morphology of the mouthparts is related to the blood sucking activity, and is compared with the characteristics of other gnathiidae species.Foi estudada a parasitose dos peixes estuarinos Mugil gaimardianus Desmarest, 1831 (Mugilidae, Arius phrygiatus Valenciennes, 1839 (Ariidae, Conodon nobilis Linnaeus, 1759 (Haemulidae, Cetengraulis edentulus Cuvier, 1829 (Engraulidae, e Anableps anableps Linnaeus, 1758 (Anablepidae por larvas praniza de Gnathiidae (Crustacea, Isopoda em exemplares pescados no Oceano Atlântico, no Nordeste do Pará, próximo a Bragança, Brasil. O valor mais elevado da prevalência da infecção foi observado em A. anableps (42,3% e o menor em C. nobilis (9,1%. A intensidade média da parasitose variou entre 1 parasita em C. nobilis até 19,5 em A. phrygiatus. Efetua-se a descrição da larva, verificando-se que a morfologia da armadura bucal está relacionada com a atividade sugadora de sangue, e faz-se a comparação com as características de outras espécies.

  15. Gastro-intestinal helminths of goliath frogs (Conraua goliath from the localities of Loum, Yabassi and Nkondjock in the Littoral Region of Cameroon

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    Nguiffo Nguete Daniel

    2015-07-01

    Full Text Available The gastro-intestinal helminth parasites of goliath frog (Conraua goliath from the Littoral Region of Cameroon in the Localities of Loum, Yabassi and Nkondjock were surveyed. Out of the 30 goliath frogs examined (13 males and 17 females between April and May 2013, 26 (85% contained at least one helminth parasite and yielded a total of nine hundred and seventy three (973 helminths comprising: Nematodes (90.5%, Trematodes (9.4% and Pentastomids (0.1%. Nematodes included: Africana taylori (60%, Oswaldocruzia perreti (0.2%, Aplectana sp. (21%, Gendria sp. (7.1%, Amphibiophilus sp. (0.2%, Strongyluris sp. (0.1%, Physalopteroides sp. (1.6%, and Oxyuridae gen. sp. (0.3%. Trematodes comprised: Mesocoelium sp. (7.3% and Diplodiscus subclavatus (2.1%. Pentastomids were represented by Sebekia sp. (0.1%. The mean species richness and diversity were 1.97±2.12 and 0.41±0.04 respectively. The intensity of parasite infection was correlated with host body weight, positively for Africana taylori, Aplectana sp., Diplodiscus subclavatus, and Mesocoeliumsp. Infection rates were influenced by land-use pattern. Thus higher prevalences were observed in Loum (intensive agricultural area.

  16. The influence of a toxic cyanobacterial bloom and water hydrology on algal populations and macroinvertebrate abundance in the upper littoral zone of Lake Krugersdrift, South Africa.

    Science.gov (United States)

    Oberholster, Paul J; Botha, Anna-Maria; Ashton, Peter J

    2009-01-01

    The biological interactions and the physical and chemical properties of the littoral zone of Lake Krugersdrift were studied for a 4-month period when a dense, toxic cyanobacterial bloom dominated by Microcystis aeruginosa was present in the main lake basin. The presence of a toxic strain of M. aeruginosa was confirmed through the use of ELISA and molecular markers that detect the presence of the mcyB and mcyD genes of the mcy gene cluster that synthesizes microcystin. An increase in Microcystis toxicity at sites dominated by the cyanobacterial scum was accompanied by an increase in total abundance of the macroinvertebrate families Hirudinae, Chironomidae, and Tubificidae. Sites located away from the cyanobacterial scum had a lower abundance but a higher diversity of macroinvertebrates. The water quality under the Microcystis scum was characterized by low pH values, low concentrations of dissolved oxygen, and lower total alkalinity values. The periphytic alga Ulothrix zonata was absent in areas dominated by the cyanobacterial scum, possibly as a result of overshadowing by the scum or direct toxic allelopathic effects on growth and photosynthesis. The diatom Diatoma vulgare dominated the benthic algal flora beneath the cyanobacterial scum.

  17. SIRPα and FHOD1 are unique markers of littoral cells, a recently evolved major cell population of red pulp of human spleen

    Science.gov (United States)

    Ogembo, Javier Gordon; Milner, Danny A.; Mansfield, Keith G.; Rodig, Scott J.; Murphy, George F.; Kutok, Jeffery L.; Pinkus, Geraldine S.; Fingeroth, Joyce D.

    2012-01-01

    Asplenic individuals are compromised not only in their ability to destroy infectious agents, but are at increased risk of death from autoimmune disease, certain tumors, and ischemic heart disease. Enhanced mortality is attributed to lack of phagocytes sequestered in spleen that efficiently engulf and destroy appropriate targets, though related cells are found elsewhere. To determine whether a unique population regulates RBC-pathogen clearance and filtration of altered self, we reviewed the anatomic literature and analyzed in situ by immunohistochemistry and immunofluorescence the expression patterns of a little-characterized cell that dominates the splenic red pulp of man and closely related primates-the venous sinus lining or littoral cell (LC). High expression of the formin FHOD1 outlines the LC population. Though LCs are endothelial-like in distribution they express several macrophage directed proteins, the RBC antigen DARC and T-cell co-receptor CD8α/α yet they lack lineage-associated markers CD34 and CD45. Strikingly, SIRPα (CD172a) expression in human spleen concentrates on LCs, consistent with recent demonstration of a key role in RBC turnover and elimination versus release of infected or altered self. Our results indicate human LCs (SIRPα+, FHOD1+, CD8α/α+, CD34−, CD45−) comprise a highly plastic barrier cell population that emerged late in primate evolution coordinate with CD8 expression. Unique to Hominidae, LCs may be the ultimate determinant of which cells re-circulate after passage through human spleen. PMID:22490440

  18. Futuro del turismo de masas sol y playa del litoral mediterráneo español / Future mass tourism of sun and beach Spanish Mediterranean littoral

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    Marta Collado Lara

    2013-01-01

    Full Text Available ResumenLa situación problemática de los destinos maduros de demanda masiva sol y playa del litoral español y las medidas encaminadas, por las políticas turísticas, a la mejora de la pérdida de competitividad del sector, requieren un nuevo modelo de desarrollo turístico para estos destinos. El objetivo del trabajo, es aportar valor añadido al diseño de nuevos modelos de desarrollo turístico de futuro mediante la aplicación de las herramientas de prospectiva territorial, como instrumento capaz de reforzar procesos de planificación. Para mostrar la viabilidad de estas herramientas se lleva a cabo una valoración de similitudes o brechas entre dos modelos de desarrollo turístico; por un lado, un modelo de desarrollo hipotético de un destino maduro del litoral mediterráneo [utilizando las herramientas de prospectiva territorial] y, por otro, el modelo de desarrollo de un Proyecto Piloto de un caso real de planeamiento urbanístico. Los resultados de la valoración revelan que los dos modelos presentan muchas similitudes, lo que permite mostrar el potencial de la prospectiva territorial como instrumento para hacer frente a los problemas de desarrollo turístico plagados de complejidad e incertidumbre, así como su capacidad para reducir el análisis de los desafíos globales a las implicaciones locales y espaciales.Palabras claveDestinos maduros, prospectiva, demanda masiva sol y playa, incertidumbre, desarrollo turísticoAbstractThe problematic situation of the mature destinations of massive demand of sun and beach of the Spanish littoral and the measures directed to the improvement of the loss of competitiveness of the sector, demand a new model of tourist development for these destinations. The aim of the work is to supply added value to the design of new models of future tourist development by means of the application of the territorial foresight tools, as a tool able to reinforce planning processes. To demonstrate the viability of

  19. Under the volcano: phylogeography and evolution of the cave-dwelling Palmorchestia hypogaea (Amphipoda, Crustacea at La Palma (Canary Islands

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    Oromí Pedro

    2008-01-01

    Full Text Available Abstract Background The amphipod crustacean Palmorchestia hypogaea occurs only in La Palma (Canary Islands and is one of the few terrestrial amphipods in the world that have adapted to a strictly troglobitic life in volcanic cave habitats. A surface-dwelling closely related species (Palmorchestia epigaea lives in the humid laurel forest on the same island. Previous studies have suggested that an ancestral littoral Orchestia species colonized the humid forests of La Palma and that subsequent drought episodes in the Canaries reduced the distribution of P. epigaea favouring the colonization of lava tubes through an adaptive shift. This was followed by dispersal via the hypogean crevicular system. Results P. hypogaea and P. epigaea did not form reciprocally monophyletic mitochondrial DNA clades. They showed geographically highly structured and genetically divergent populations with current gene flow limited to geographically close surface locations. Coalescence times using Bayesian estimations assuming a non-correlated relaxed clock with a normal prior distribution of the age of La Palma, together with the lack of association of habitat type with ancestral and recent haplotypes, suggest that their adaptation to cave life is relatively ancient. Conclusion The data gathered here provide evidence for multiple invasions of the volcanic cave systems that have acted as refuges. A re-evaluation of the taxonomic status of the extant species of Palmorchestia is needed, as the division of the two species by habitat and ecology is unnatural. The information obtained here, and that from previous studies on hypogean fauna, shows the importance of factors such as the uncoupling of morphological and genetic evolution, the role of climatic change and regressive evolution as key processes in leading to subterranean biodiversity.

  20. Identification of palaeo-seawater intrusion in groundwater using minor ions in a semi-confined aquifer of the Río de la Plata littoral (Argentina)

    Energy Technology Data Exchange (ETDEWEB)

    Santucci, L., E-mail: eleocarol@fcnym.unlp.edu.ar [Centro de Investigaciones Geológicas (CIG), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Universidad Nacional de La Plata - UNLP, Calle 64 y Diag. 113, 1900 La Plata, Buenos Aires (Argentina); Carol, E. [Centro de Investigaciones Geológicas (CIG), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Universidad Nacional de La Plata - UNLP, Calle 64 y Diag. 113, 1900 La Plata, Buenos Aires (Argentina); Kruse, E. [Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Cátedra de Hidrología General de la Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata (UNLP), Calle 64 #3, 1900 La Plata, Buenos Aires (Argentina)

    2016-10-01

    The hydrochemistry of minor elements and traces such as bromide, lithium, strontium, uranium and selenium, together with the chemical analysis of major ions, has been used in the study of salinization process. This process occurs in a semi-confined aquifer that corresponds to a Pliocene–Pleistocene fluvial environment. The semi-confined aquifer is located in the littoral of the cities of Ensenada and Berisso, in the region of the middle Río de la Plata estuary, Argentina. Groundwater salinization was detected in the semi-confined aquifer in the coastal plain area, with salt contents that increase from the loess plain towards the river. The content of major ions that predominate in sea water (Cl{sup −}, Na{sup +} and Mg{sup 2+}), as well as the Cl{sup −}/Br{sup −} and U vs. Cl{sup −} ratios, demonstrates that such salinization is related to sea water, which shows no correspondence with estuary water. In the salinized area, Li, Sr and Se enrichments occur, and are used as tracers of the average time that a substance remains in solution in sea water in the aquifer. The study of such minor ions together with the geological evolution of the area made it possible to recognize that the salt water in the semi-confined aquifer corresponds to a palaeo-intrusion of sea water associated with the Pleistocene–Holocene ingressions caused by the climate changes occurring during the Quaternary. - Highlights: • The semi-confined aquifer in a sector of the Río de la Plata estuary is salinized. • Saline content is higher in the aquifer than in the estuary. • Minor elements indicate the occurrence of palaeo-seawater intrusion. • Palaeo-seawater intrusion may be associated with interglacial fluctuations.

  1. Heavy metals in isopods from the supra-littoral zone on the southern shore of the Severn Estuary, UK. [Ligia oceanica; Oniscus asellus; Porcellio scaber

    Energy Technology Data Exchange (ETDEWEB)

    Hopkin, S.P.; Martin, M.H.; Moss, S.J.

    1985-01-01

    The concentrations of zinc, cadmium, lead and copper in the tissues of the littoral isopod Ligia oceanica from three sites near to a primary zinc, lead and cadmium smelting works on the southern shore of the Severn Eastuary and an unpolluted site were determined. The concentrations of zinc, cadmium and copper in whole L. oceanica from the contaminated sites were significantly higher than in specimens from the uncontaminated site, although the levels were only about one-and-a-half, three to four and twice as great, respectively. The amounts of lead in L. oceanica from all four sites were very small. The hepatopancreas, at all sites, contained more than 50% of the total zinc, cadmium and copper in the body. The concentrations of heavy metals were compared in the tissues of L. oceanica and in two more terrestrial isopods, Oniscus asellus and Porcellio scaber, collected from the same habitat at one of the contaminated sites. The mean concentrations of copper were the same in the hepatopancreas of all the isopods. However, there were large differences in the extent to which zinc, cadmium and lead had been accumulated by this organ in the three species. Analysis of the gut contents of the isopods revealed that all three species had been feeding on leaf litter derived from nearby trees, rather than on seaweed washed up onto the shore. Therefore, it was concluded that the extent to which zinc, cadmium and lead were assimilated by L. oceanica, O. asellus and Porcellio scaber must have been related to differences in their digestive physiology, rather than to choice of food material containing different concentrations of metals.

  2. Repeated landmass reformation limits diversification in the widespread littoral zone mosquito Anopheles sundaicus sensu lato in the Indo-Oriental Region.

    Science.gov (United States)

    Zarowiecki, Magdalena; Linton, Yvonne-Marie; Post, Rory J; Bangs, Michael J; Htun, Pe Than; Hlaing, Thaung; Seng, Chang Moh; Baimai, Visut; Ding, Trung Ho; Sochantha, Tho; Walton, Catherine

    2014-05-01

    Southeast Asia harbours abundant biodiversity, hypothesized to have been generated by Pliocene and Pleistocene climatic and environmental change. Vicariance between the island of Borneo, the remaining Indonesian archipelago and mainland Southeast Asia caused by elevated sea levels during interglacial periods has been proposed to lead to diversification in the littoral zone mosquito Anopheles (Cellia) sundaicus (Rodenwaldt) sensu lato. To test this biogeographical hypothesis, we inferred the population history and assessed gene flow of A. sundaicus s.l. sampled from 18 populations across its pan-Asian species range, using sequences from mitochondrial cytochrome c oxidase subunit 1 (CO1), the internal transcribed spacer 2 (ITS2) and the mannose phosphate isomerase (Mpi) gene. A hypothesis of ecological speciation for A. sundaicus involving divergent adaptation to brackish and freshwater larval habitats was also previously proposed, based on a deficiency of heterozygotes for Mpi allozyme alleles in sympatry. This hypothesis was not supported by Mpi sequence data, which exhibited no fixed differences between brackish and freshwater larval habitats. Mpi and CO1 supported the presence of up to eight genetically distinct population groupings. Counter to the hypothesis of three allopatric species, divergence was often no greater between Borneo, Sumatra/Java and the Southeast Asian mainland than it was between genetic groupings within these landmasses. An isolation-with-migration (IM) model indicates recurrent gene flow between the current major landmasses. Such gene flow would have been possible during glacial periods when the current landmasses merged, presenting opportunities for dispersal along expanding and contracting coastlines. Consequently, Pleistocene climatic variation has proved a homogenizing, rather than diversifying, force for A. sundaicus diversity. © 2014 John Wiley & Sons Ltd.

  3. [Infection of the mollusc Littorina saxatilis with parthenites of trematodes and their impact on a shell form: analysis of populations inhabiting the littoral coast of the White Sea].

    Science.gov (United States)

    Kaliberdina, M V; Granovich, A I

    2003-01-01

    12 rocky shore populations of Littorina saxatilis from three islands of Chupa Inlet (Kandalaksha Bay, White Sea) were examined for infection with trematodes. Morphometric characters (6 indexes of the shell and aperture shape) of molluscs were investigated for all these populations. Exposed and sheltered sites were considered at every island and high and low littoral samples were fulfilled at every site. Seven species of trematodes, Podocotyle atomon, Cryptocotyle lingua, Renicola sp., Himasthla sp., Microphallus piriformes, M. pygmaeus, M. pseudopygmaeus, were found. Uneven distribution of trematodes was confirmed by log-linear analysis. Sheltered populations of L. saxatilis have the greater infection prevalence than exposed ones. This is due to the heavy infection with M. piriformes and M. pygmaeus. The prevalences by these trematodes are up to 52.97% and 27.16% respectively in sheltered populations of the host. The prevalence of M. piriformes tend to be higher at the upper shore level of sheltered sites. In a contrast, the prevalence of M. pygmaeus is significantly higher at the low part of such sites. Factor analysis shows a significant association of the indices of L. saxatilis shell shape with three factors. The first one is associated with the "elongation" of a shell and reveals L. saxatilis from the exposed rocky shore to be more elongated than the molluscs from sheltered sites. The second one is connected with the "aperture shape" index. There is an association of this factor with the shore level position of samples. The third factor reflects the affect of trematodes on the shell shape. The molluscs infected with M. piriformes show "elongated" shell shape and relatively smaller aperture. Shall peculiarities of the hosts infected with M. piriformes and M. pygmaeus are somewhat different. The results of the factor analysis is justified by the series of analysis of variances on the values of shell indices (MANOVA) according to the factors "exposure", "shore

  4. Determining the high variability of pCO2 and pO2 in the littoral zone of a subtropical coastal lake

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    Denise Tonetta

    2014-09-01

    Full Text Available The aquatic metabolism comprises production and mineralization of organic matter through biological processes, such as primary production and respiration that can be estimated by gases concentration in the water column. AIM: The study aimed to assess the temporal variability of pCO2 and pO2 in the littoral zone of a subtropical coastal lake. Our hypotheses are i high variability in meteorological conditions, such as temperature and light, drive the high variability in pCO2 and pO2, and ii the lake is permanently heterotrophic due to the low phosphorus concentration. METHODS: We estimated pCO2 from pH-alkalinity method, and pO2 from dissolved oxygen concentration and water temperature measured in free-water during 24 hours in the autumn, winter, spring and summer. RESULTS: Our findings showed that limnological variables had low temporal variability, while the meteorological variables and pCO2 presented a high coefficient of variation, which is representative of each climatic season. In autumn and winter, it was recorded that the lake was supersaturated in CO2 relative to the atmosphere, while in spring and summer CO2 concentration was below the concentration found in the atmosphere. Over 24 hours, pCO2 also showed high variability, with autumn presenting higher concentration during the night when compared to daytime. Water temperature and chlorophyll a were negatively correlated with pCO2, while pO2 was positively correlated with wind and light. CONCLUSION: Agreeing with our first hypothesis, pCO2 showed an expressive temporal variation in a subtropical lake associated to the high variability in meteorological conditions. On the other hand, our second hypothesis was not confirmed, since Peri Lake exported CO2 to the atmosphere in some periods and in others, CO2 was removed from the atmosphere.

  5. Geochemical distribution of harmful elements in top soils of an Italian National Interest Area (S.I.N.): the Domizio-Flegreo Littoral and Agro Aversano case study

    Science.gov (United States)

    Bove, M.; Grezzi, G.; Albanese, S.; de Vivo, B.; Lima, A.

    2009-04-01

    The Domizio-Flegreo Littoral and Agro Aversano area has been classified by the Italian Ministry of Environment (Italian Ministero dell'Ambiente e della Tutela del Territorio e del Mare) as a S.I.N. (Sito di Interesse Nazionale, L. 426/98 - Decreto 10 Gennaio 2000 - G.U. 29/5/01). In this category have been included all those contaminated lands that, both for their extension and their historical and present land use, are considered to be particularly harmful for human health. In Italy have been selected a total of 54 S.I.N.; among all of these, the Domizio-Flegreo Littoral and Agro Aversano S.I.N. is one of the widest (1564 Km2). The study area is located in north-western Campania region, from the Avella Mountain to the coastline, and from the Campi Flegrei area to the northern boundaries between Campania and Latium Regions. It includes a total of 77 towns from both Naples and Caserta provinces. The Domizio-Flegreo Littoral and Agro Aversano S.I.N. is characterized by a strongly urbanization in its internal portions, and by intensive agricultural activities in its northern and coastal portions. During past years this wide area has been the set of an unknown number of illegal activities controlled by the organized crime, including toxic waste disposal of unknown sources from different Regions of Italy, unauthorized building, intensive uncontrolled agricultural practices and so on. Part of these environmental crimes have been and are under investigations by Italian Authorities. For a geochemical characterization of this contaminated land, between May 2006 and January 2008, a total of 292 (179 in the Litorale Domizio-Flegreo and 113 in the Agro Aversano) top soils (5-15 cm depth) have been collected, with a sampling density of about 1 sample/5 Km2. The <100 mesh soil fraction has been analyzed with ICP-MS to determine the concentration of the 39 elements: Ag, Al, As, Au, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, Ga, Hg, K, La, Mg, Mn, Mo, Na, Ni, P, Pb, S, Sb, Sc, Se, Sn

  6. Rotifera das zonas limnética e litorânea do reservatório de Tapacurá, Pernambuco, Brasil Rotifera from littoral and pelagic zones of Tapacurá reservoir, Pernambuco, Brazil

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    Viviane L. dos S. Almeida

    Full Text Available Os rotíferos do reservatório de Tapacurá, Pernambuco, Brasil foram estudados quanto à distribuição horizontal nas zonas limnética e litorânea, nos períodos chuvoso (agosto de 2003 e seco (janeiro de 2004. Amostras quali-quantitativas foram obtidas através de coletas em ritmo nictimeral nas distintas zonas do reservatório, com intervalo de seis horas, em duas profundidades. Os parâmetros bióticos riqueza, densidade, diversidade e equitabilidade foram avaliados. Análises de similaridade e variância (ANOVA também foram utilizadas. Vinte e oito espécies e duas subespécies de Rotifera foram encontradas, das quais cinco espécies são novas ocorrências para Pernambuco. A zona litorânea apresentou maior riqueza que a limnética em ambos ao período sazonais, com nove espécies exclusivas. As diferenças de densidade e equitabilidade entre as zonas do reservatório não foram significativas, ao contrário da diversidade, que apresentou-se mais elevada na zona litorânea no período seco (pThe rotifers of Tapacurá reservoir, State of Pernambuco, Brazil, were studied concerning the horizontal distribution in pelagic and littoral zones, in the rainy (August/2003 and dry seasons (January/2004. Qualitative and quantitative samples were carried out in nictimeral samplings in the different zones of the reservoir, with an interval of six hours in the two depths. Biotic parameters as richness, density, diversity and equitability were estimated. Similarity and Analysis of Variance (ANOVA were also used. Twenty-eight species and two subspecies of Rotifer were found from which five species are considered new occurrences in State of Pernambuco. The littoral zone presented higher richness than the limnetic zone in both seasonal periods with nine exclusive species. The density and equitability differences between zones of the reservoir were not expressive in opposite to diversity that was higher in the littoral zone in the dry season (p<0.01. The

  7. Accommodation space in a high-wave-energy inner-shelf during the Holocene marine transgression: Correlation of onshore and offshore inner-shelf deposits (0–12 ka) in the Columbia River littoral cell system, Washington and Oregon, USA

    Science.gov (United States)

    Peterson, C. D.; Twichell, D. C.; Roberts, M. C.; Vanderburgh, S.; Hostetler, Steven W.

    2016-01-01

    The Columbia River Littoral Cell (CRLC), a high-wave-energy littoral system, extends 160 km alongshore, generally north of the large Columbia River, and 10–15 km in across-shelf distance from paleo-beach backshores to about 50 m present water depths. Onshore drill holes (19 in number and 5–35 m in subsurface depth) and offshore vibracores (33 in number and 1–5 m in subsurface depth) constrain inner-shelf sand grain sizes (sample means 0.13–0.25 mm) and heavy mineral source indicators (> 90% Holocene Columbia River sand) of the inner-shelf facies (≥ 90% fine sand). Stratigraphic correlation of the transgressive ravinement surface in onshore drill holes and in offshore seismic reflection profiles provide age constraints (0–12 ka) on post-ravinement inner-shelf deposits, using paleo-sea level curves and radiocarbon dates. Post-ravinement deposit thickness (1–50 m) and long-term sedimentation rates (0.4–4.4 m ka− 1) are positively correlated to the cross-shelf gradients (0.36–0.63%) of the transgressive ravinement surface. The total post-ravinement fill volume of fine littoral sand (2.48 × 1010 m3) in the inner-shelf represents about 2.07 × 106 m3 year− 1 fine sand accumulation rate during the last 12 ka, or about one third of the estimated middle- to late-Holocene Columbia River bedload or sand discharge (5–6 × 106 m3 year− 1) to the littoral zone. The fine sand accumulation in the inner-shelf represents post-ravinement accommodation space resulting from 1) geometry and depth of the transgressive ravinement surface, 2) post-ravinement sea-level rise, and 3) fine sand dispersal in the inner-shelf by combined high-wave-energy and geostrophic flow/down-welling drift currents during major winter storms.

  8. Brain architecture of the largest living land arthropod, the Giant Robber Crab Birgus latro (Crustacea, Anomura, Coenobitidae: evidence for a prominent central olfactory pathway?

    Directory of Open Access Journals (Sweden)

    Krieger Jakob

    2010-09-01

    Full Text Available Abstract Background Several lineages within the Crustacea conquered land independently during evolution, thereby requiring physiological adaptations for a semi-terrestrial or even a fully terrestrial lifestyle. Birgus latro Linnaeus, 1767, the giant robber crab or coconut crab (Anomura, Coenobitidae, is the largest land-living arthropod and inhabits Indo-Pacific islands such as Christmas Island. B. latro has served as a model in numerous studies of physiological aspects related to the conquest of land by crustaceans. From an olfactory point of view, a transition from sea to land means that molecules need to be detected in gas phase instead of in water solution. Previous studies have provided physiological evidence that terrestrial hermit crabs (Coenobitidae such as B. latro have a sensitive and well differentiated sense of smell. Here we analyze the brain, in particular the olfactory processing areas of B. latro, by morphological analysis followed by 3 D reconstruction and immunocytochemical studies of synaptic proteins and a neuropeptide. Results The primary and secondary olfactory centers dominate the brain of B. latro and together account for ca. 40% of the neuropil volume in its brain. The paired olfactory neuropils are tripartite and composed of more than 1,000 columnar olfactory glomeruli, which are radially arranged around the periphery of the olfactory neuropils. The glomeruli are innervated ca. 90,000 local interneurons and ca. 160,000 projection neurons per side. The secondary olfactory centers, the paired hemiellipsoid neuropils, are targeted by the axons of these olfactory projection neurons. The projection neuron axonal branches make contact to ca. 250.000 interneurons (per side associated with the hemiellipsoid neuropils. The hemiellipsoid body neuropil is organized into parallel neuropil lamellae, a design that is quite unusual for decapod crustaceans. The architecture of the optic neuropils and areas associated with antenna two

  9. A Description of Biremis panamae sp. nov., a New Diatom Species from the Marine Littoral, with an Account of the Phylogenetic Position of Biremis D.G. Mann et E.J. Cox (Bacillariophyceae.

    Directory of Open Access Journals (Sweden)

    Andrzej Witkowski

    Full Text Available Here we present a formal description of Biremis panamae Barka, Witkowski et Weisenborn sp. nov., which was isolated from the marine littoral environment of the Pacific Ocean coast of Panama. The description is based on morphology (light and electron microscopy and the rbcL, psbC and SSU sequences of one clone of this species. The new species is included in Biremis due to its morphological features; i.e. two marginal rows of foramina, chambered striae, and girdle composed of numerous punctate copulae. The new species also possesses a striated valve face which is not seen in most known representatives of marine littoral Biremis species. In this study we also present the relationship of Biremis to other taxa using morphology, DNA sequence data and observations of auxosporulation. Our results based on these three sources point to an evolutionary relationship between Biremis, Neidium and Scoliopleura. The unusual silicified incunabular caps present in them are known otherwise only in Muelleria, which is probably related to the Neidiaceae and Scoliotropidaceae. We also discuss the relationship between Biremis and the recently described Labellicula and Olifantiella.

  10. Ecological aspects of lake regulation in Northern Finland. Part 2. Geomorphology and vegetation of the littoral zone. Ekologiset naekoekohdat joidenkin Pohjois-Suomen jaervien saeaennoestelyssae. Osa 2. Rannan geomorfologia ja vesikasvillisuus

    Energy Technology Data Exchange (ETDEWEB)

    Hellsten, S.; Alasaarela, E. (9830800FI); Keraenen, R.; Nykaenen, M. (Oulu Univ. (Finland)); Neuvonen, I. (Kainuun Vesi- ja ympaeristoepiiri, Kajaani (Finland))

    1989-02-01

    Ecological aspects of lake regulation were studied in certain lakes in northern Finland in 1984-1987. The general aims of the project were to analyze the effects of regulation on lake ecosystems and to produce information that can be applied when assessing the possible effects of hydroelectric projects. The effects of lake regulation were easy to observe in the littoral zone of Lake Ontojaervi, the sandy shores in particular were unstable both above and below the water level. The shores were very much steeper than those of Lake Lentua, which affected the distribution of bottom types, minerogenic bottoms were more common than in the latter lake. The results from the two lakes were used to calculate a simple model to forecast the distribution of bottom types of Lake Ontojaervi before regulation. The effect of penetration by ice was also easy to recognize on the shores of Lake Ontojaervi; the surface sediment being frozen to a greater depth than in Lake Lentua. Beneath the freezing zone in ice just pressed down on the sediment. The littoral vegetation decreased markedly after regulation and was entirely absent in open places. Changes in abundance were particularly clear, with decreases in the large isoetides and helophytes and increases of small isoetides. The results from Lake Lentua were used to formulate a simple ecological model for the frequency of macrophytes.

  11. The complete mitochondrial genome of the mantid shrimp Oratosquilla oratoria (Crustacea: Malacostraca: Stomatopoda): Novel non-coding regions features and phylogenetic implications of the Stomatopoda.

    Science.gov (United States)

    Liu, Yuan; Cui, Zhaoxia

    2010-09-01

    The complete mitochondrial (mt) genome sequence of Oratosquilla oratoria (Crustacea: Malacostraca: Stomatopoda) was determined; a circular molecule of 15,783 bp in length. The gene content and arrangement are consistent with the pancrustacean ground pattern. The mt control region of O. oratoria is characterized by no GA-block near the 3' end and different position of [TA(A)]n-blocks compared with other reported Stomatopoda species. The sequence of the second hairpin structure is relative conserved which suggests this region may be a synapomorphic character for the Stomatopoda. In addition, a relative large intergenic spacer (101 bp) with higher A+T content than that in control region was identified between the tRNA(Glu) and tRNA(Phe) genes. Phylogenetic analyses based on the current dataset of complete mt genomes strongly support the Stomatopoda is closely related to Euphausiacea. They in turn cluster with Penaeoidea and Caridea clades while other decapods form a separate group, which rejects the monophyly of Decapoda. This challenges the suitability of Stomatopoda as an outgroup of Decapoda in phylogenetic analyses. The basal position of Stomatopoda within Eumalacostraca according to the morphological characters is also questioned.

  12. On the presence of the Mediterranean endemic Microdeutopus sporadhi Myers, 1969 (Crustacea: Amphipoda: Aoridae in the Gulf of Naples (Italy with a review on its distribution and ecology

    Directory of Open Access Journals (Sweden)

    M. B. SCIPIONE

    2013-10-01

    Full Text Available The species Microdeutopus sporadhi (Crustacea: Amphipoda: Aoridae, endemic of the Mediterranean Sea, was described by Myers in 1969 on material collected from the Aegean Sea in a sheltered environment with high sedimentation rates. A check on the distribution and ecology of M. sporadhi showed that: — although not mentioned in the checklist of amphipods of the Italian seas, it was already found in the central Tyrrhenian Sea in 1983-84 and in the northern Adriatic Sea in 2002-03; — it was rarely found in the Mediterranean Sea, one of the most studied basins as concerns amphipod fauna; but notwithstanding the few records available, the wide ecological spectrum of this species was pointed out. The present study, conducted off the Island of Ischia (Gulf of Naples, Italy, showed the presence of rich and well established populations through time, but only in a peculiar substratum (artificial collectors and environment (low pH values. The species seems to be able to withstand harsh environmental conditions and probably to conceal itself through a cryptic behaviour, escaping traditional sampling methods. The role of rare or hidden species in bio-assessment should be re-evaluated.

  13. On the presence of the Mediterranean endemic Microdeutopus sporadhi Myers, 1969 (Crustacea: Amphipoda: Aoridae in the Gulf of Naples (Italy with a review on its distribution and ecology

    Directory of Open Access Journals (Sweden)

    M. B. SCIPIONE

    2013-07-01

    Full Text Available The species Microdeutopus sporadhi (Crustacea: Amphipoda: Aoridae, endemic of the Mediterranean Sea, was described by Myers in 1969 on material collected from the Aegean Sea in a sheltered environment with high sedimentation rates. A check on the distribution and ecology of M. sporadhi showed that: — although not mentioned in the checklist of amphipods of the Italian seas, it was already found in the central Tyrrhenian Sea in 1983-84 and in the northern Adriatic Sea in 2002-03; — it was rarely found in the Mediterranean Sea, one of the most studied basins as concerns amphipod fauna; but notwithstanding the few records available, the wide ecological spectrum of this species was pointed out. The present study, conducted off the Island of Ischia (Gulf of Naples, Italy, showed the presence of rich and well established populations through time, but only in a peculiar substratum (artificial collectors and environment (low pH values. The species seems to be able to withstand harsh environmental conditions and probably to conceal itself through a cryptic behaviour, escaping traditional sampling methods. The role of rare or hidden species in bio-assessment should be re-evaluated.

  14. The water flea Daphnia magna (Crustacea, Cladocera) as a test species for screening and evaluation of chemicals with endocrine disrupting effects on crustaceans.

    Science.gov (United States)

    Tatarazako, Norihisa; Oda, Shigeto

    2007-02-01

    The water flea Daphnia magna (Crustacea, Cladocera) is a cyclical parthenogen, which can reproduce both by parthenogenesis and by sexual reproduction. With its ease of handling in the laboratory, several testing methods using D. magna exist for regulatory toxicity testing. Recently, several studies revealed that one of the major hormone groups in insects and crustaceans, juvenile hormones, are involved in the shift of reproductive mode from parthenogenesis to sexual reproduction (production of male neonates). Using offspring sex ratio as a new endpoint has made it possible to identify chemicals with juvenile hormone-like effects on crustaceans. The testing method using D. magna, in which offspring sex ratio is incorporated as a new endpoint, is now being proposed to the OECD as an enhanced version of the existing OECD Test Guideline 211: Daphnia magna reproduction test. No other clear-cut endpoint for identifying juvenile-hormone disrupting effects has ever been found in crustaceans than the induction of male neonates production in cladocerans. In this regard, it is expected that testing methods using D. magna are suitable for screening and risk assessment of chemicals with juvenile-hormone disrupting effects.

  15. Five species of the family Cyproideidae (Crustacea: Amphipoda) from Japan, with the description of a new genus and two new species.

    Science.gov (United States)

    Ariyama, Hiroyuki

    2016-03-31

    Five species of the family Cyproideidae (Crustacea: Amphipoda) are described from shallow sea in Japan. Cyproidea liodactyla Hirayama, 1978 was collected from Kanagawa and Shizuoka Prefectures and Ariake Sea. Morphological character of the antenna 1 in these specimens is different from the original description. Examining the paratypes of C. liodactyla, the shape of the antenna 1 in the holotype is revealed to be abnormal. Cyproidea okinawensis sp. nov. was collected from Okinawa Island. Its morphological characters resemble C. liodactyla and C. robusta Ren, 2006; however, this new species is different from the former in the smaller eyes, the narrower coxa 5 and the coloration, and from the latter in the ovoid telson. Metacyproidea gen. nov. is established with M. makie sp. nov. from Hachijo Island in Tokyo Prefecture as its type species. This new genus resembles Cyproidea, especially in the peduncular article 2 of antenna 1 with a distinct distal tooth and the posterodorsal end of urosomites with a strong projection. However, Metacyproidea can be distinguished from Cyproidea by the coalesced urosomites 2-3 and the antenna 1 with a 10-16-articulated flagellum. Moolapheonoides acutifalcatus Kobayashi & Ishimaru, 2005 and Terepeltopes dolichorhunia Hirayama, 1983 were also collected from Wakayama and Fukui Prefectures and Kanagawa, Shizuoka and Yamaguchi Prefectures, respectively. A key to species of the family Cyproideidae in Japan is provided.

  16. Effect of ingested tungsten oxide (WOx) nanofibers on digestive gland tissue of Porcellio scaber (Isopoda, Crustacea): fourier transform infrared (FTIR) imaging.

    Science.gov (United States)

    Novak, Sara; Drobne, Damjana; Vaccari, Lisa; Kiskinova, Maya; Ferraris, Paolo; Birarda, Giovanni; Remškar, Maja; Hočevar, Matej

    2013-10-01

    Tungsten nanofibers are recognized as biologically potent. We study deviations in molecular composition between normal and digestive gland tissue of WOx nanofibers (nano-WOx) fed invertebrate Porcellio scaber (Iosopda, Crustacea) and revealed mechanisms of nano-WOx effect in vivo. Fourier Transform Infrared (FTIR) imaging performed on digestive gland epithelium was supplemented by toxicity and cytotoxicity analyses as well as scanning electron microscopy (SEM) of the surface of the epithelium. The difference in the spectra of the Nano-WOx treated and control cells showed up in the central region of the cells and were related to lipid peroxidation, and structural changes of nucleic acids. The conventional toxicity parameters failed to show toxic effects of nano-WOx, whereas the cytotoxicity biomarkers and SEM investigation of digestive gland epithelium indicated sporadic effects of nanofibers. Since toxicological and cytological measurements did not highlight severe effects, the biochemical alterations evidenced by FTIR imaging have been explained as the result of cell protection (acclimation) mechanisms to unfavorable conditions and indication of a nonhomeostatic state, which can lead to toxic effects.

  17. External factors determining breeding season in the red mangrove crab Goniopsis cruentata (Latreille (Crustacea, Brachyura, Grapsidae on the São Paulo State northern coast, Brazil

    Directory of Open Access Journals (Sweden)

    Cobo Valter José

    2003-01-01

    Full Text Available This study evaluated the influence of the water and air temperatures, pluviosity and photoperiod on the breeding season of Goniopsis cruentata (Latreille, 1803, in Ubatuba littoral, southeastern Brazilian coast. Monthly collections were conducted out from January/95 to December/96 in an estuarine area from 23º29'10"-23º29'45"S to 45º09'10"-45º10'00"W. Water and air temperature variation showed the highest correlation coefficient with the frequency of ovigerous females, r² = 0.73 and 0.68, respectively. However, an analysis of the set of environmental variables, revealed the photoperiod as the factor of highest association with the ovigerous frequency (r² = 0.68. This degree of association allow us to suggest that the breeding season duration of G. cruentata might have some variations over different latitudes, and such results could be quite diverse in populations from different latitudes.

  18. Species composition and abundance of the benthic community of Axiidea and Gebiidea (Crustacea: Decapoda in the Marapanim Bay, Amazon estuary, northern Brazil

    Directory of Open Access Journals (Sweden)

    Dalila Costa Silva

    2012-04-01

    Full Text Available The thalassinideans (Axiidea and Gebiidea encompasses approximately 615 species with reclusive habits, generally confined to extensive galleries burrowed into the sand or mud and, more rarely, in openings in reefs or the cavities of sessile animals such as sponges and coral. These species use the galleries for shelter, feeding and breeding, except during the pelagic larval stage. They inhabit estuaries, bays, lagoons, beaches, seas and both tropical and temperate oceanic areas throughout the world, distributed predominantly in the intertidal zone (mid-littoral and infralittoral zones. The aim of the present study was to assess the species composition and abundance of thalassinideans, comparing two micro-habitats (consolidated and non-consolidated substrates, and determine whether there is a correlation between abundance of the organisms and time of the year, collection sites or salinity. Twelve monthly samplings were carried out between August 2006 and July 2007 over consolidated and non-consolidated bottoms of the upper and lower portions of the mid-littoral zones, with three sub-samplings, totaling 48 monthly samples and 576 in all. A total of 651 individuals were collected - 114 Lepidophthalmus siriboia Felder & Rodrigues, 1993 and 537 Upogebia vasquezi Ngoc-Ho, 1989. There was correlation between the abundance of both species and salinity, but U. vasquezi was more abundant in the rainy season. Lepidophthalmus siriboia appears to prefer non-consolidated substrates, whereas U. vasquezi prefers consolidated substrates. The recruitment period for the callianassid L. siriboia appears to occur in just two periods of the year and is more intense in the dry season, whereas U. vasquezi is more frequent throughout the year. The smallest and largest sizes (carapace length - CL recorded for L. siriboia were smaller than those recorded for the species in northeastern region of Brazil. CL values for ovigerous females suggest that U. vasquezi reaches

  19. Testing compound-specific δ13C of amino acids in mussels as a new approach to determine the average 13C values of primary production in littoral ecosystems

    Science.gov (United States)

    Vokhshoori, N. L.; Larsen, T.; McCarthy, M.

    2012-12-01

    Compound-specific isotope analysis of amino acids (CSI-AA) is a technique used to decouple trophic enrichment patterns from source changes at the base of the food web. With this new emerging tool, it is possible to precisely determine both trophic position and δ15N or δ13C source values in higher feeding organisms. While most work to date has focused on nitrogen (N) isotopic values, early work has suggested that δ13C CSI-AA has great potential as a new tracer both to a record δ13C values of primary production (unaltered by trophic transfers), and also to "fingerprint" specific carbon source organisms. Since essential amino acids (EAA) cannot be made de novo in metazoans but must be obtained from diet, the δ13C value of the primary producer is preserved through the food web. Therefore, the δ13C values of EAAs act as a unique signature of different primary producers and can be used to fingerprint the dominant carbon (C) source driving primary production at the base of the food web. In littoral ecosystems, such as the California Upwelling System (CUS), the likely dominant C sources of suspended particulate organic matter (POM) pool are kelp, upwelling phytoplankton or estuarine phytoplankton. While bulk isotopes of C and N are used extensively to resolve relative consumer hierarchy or shifting diet in a food web, we found that the δ13C bulk values in mussels cannot distinguish exact source in littoral ecosystems. Here we show 15 sites within the CUS, between Cape Blanco, OR and La Jolla, CA where mussels were sampled and analyzed for both bulk δ13C and CSI-AA. We found no latitudinal trends, but rather average bulk δ13C values for the entire coastal record were highly consistent (-15.7 ± 0.9‰). The bulk record would suggest either nutrient provisioning from kelp or upwelled phytoplankton, but 13C-AA fingerprinting confines these two sources to upwelling. This suggests that mussels are recording integrated coastal phytoplankton values, with the enriched

  20. Littoral Undersea Warfare in 2025

    Science.gov (United States)

    2005-12-01

    SOCOM for StarLite , on 3 November 2005. 286 Phone conversation with Mr. Christopher J. Van Alt, Woods Hole Oceanographic Institute (WHOI), about...Planning Systems, based on an unsolicited bid to SOCOM for StarLite , on 3 November 2005. 290 Ibid. 291 Phone conversation with Mr. Christopher J. Van Alt...based on an unsolicited bid to SOCOM for StarLite , 3 November 2005. Porter, M.B. et al. High-Frequency Propagation for Acoustic Communications

  1. Population ecology of the planktonic shrimp Lucifer faxoni Borradaile, 1915 (Crustacea, Sergestoidea, Luciferidae of the southeastern coast of Brazil

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    Sarah de Souza Alves Teodoro

    2012-06-01

    Full Text Available Luciferid shrimps have short life spans and a rapid turnover of generations, engage in sequential spawning, and protect their eggs during incubation. This study investigates the ecology of Lucifer faxoni Borradaile, 1915 in the littoral zone, Ubatuba region, São Paulo. Sampling was conducted monthly from July 2005 to December 2006 using a Renfro net trawled over a distance of 50 m for a total sampling effort of 50 m² at each station. Nine stations were sampled, ranging from 1 to 15 m deep. Three stations each were grouped into zones 1, 2 and 3 (Z1, Z2 and Z3. Monthly values of salinity, temperature and rainfall were recorded at each station. The pre-buccal somite length (SL of each specimen was measured. The results showed that in shallower zones (Z1 and Z2, 6306 individuals were captured, whereas in the deeper zone (Z3, 3808 specimens were captured, but no significant differences in SL was detected between the specimens from Z1 and Z2 and those from Z3 (ANOVA, p=0.25. The abundance of shrimps did not differ significantly between seasons (Tukey's test, p=0.02 except in the spring. The sex ratio differed significantly over the seasons (χ², pEste estudo analisa a ecologia de Lucifer faxoni Borradaile, 1915 em Ubatuba, São Paulo. Os indivíduos foram coletados mensalmente de julho de 2005 a dezembro de 2006, com uma rede de Renfro, arrastada por uma distância de 50 m, totalizando um esforço amostral de 50 m² em cada ponto de coleta. Nove pontos foram amostrados, variando de 1 a 15 m de profundidade. Cada 3 pontos foram agrupados em 3 zonas (Z1, Z2 e Z3. Os valores de salinidade, temperatura e pluviosidade foram registrados mensalmente em cada transecto. Os espécimes foram medidos quanto ao comprimento do somito pré-bucal (SL. Os resultados mostram que nas zonas mais rasas (Z1 e Z2 foram coletados 6306 indivíduos, enquanto que na mais profunda (Z3 obteve-se 3808 espécimes, não havendo diferença estatística entre as zonas (ANOVA, p=0

  2. Stomatopod Crustacea of Suriname

    NARCIS (Netherlands)

    Holthuis, L.B.

    1959-01-01

    The present report is based in the first place on material collected by the trawler “Coquette”, which, from April to August 1957, explored the offshore waters of Suriname and French Guiana from the mouth of the Nickerie River in the west to the Iles de Salut in the east. Most of the hauls were made

  3. (Crustacea) from Verlorenvlei

    African Journals Online (AJOL)

    1994-08-29

    Aug 29, 1994 ... history of the system has been initiated, in order to reveal the climatic, floristic .... pinata is a benthic species, devoid of all swimming powers. The population in ..... permanent freshwater pools and dams in the Eastern Cape.

  4. Stomatopod Crustacea of Suriname

    NARCIS (Netherlands)

    Holthuis, L.B.

    1959-01-01

    The present report is based in the first place on material collected by the trawler “Coquette”, which, from April to August 1957, explored the offshore waters of Suriname and French Guiana from the mouth of the Nickerie River in the west to the Iles de Salut in the east. Most of the hauls were made

  5. Gut bacterial community structure (Porcellio scaber, Isopoda, Crustacea) as a measure of community level response to long-term and short-term metal pollution.

    Science.gov (United States)

    Lapanje, Ales; Rupnik, Maja; Drobne, Damjana

    2007-04-01

    Prokaryotes are of high importance in the assessment of environmental pollution effects. Due to fast responsiveness of bacterial communities to environmental physicochemical factors, it is difficult to compare results of bacterial community investigations on the temporal and spatial scale. To reduce the effects of variable physicochemical environmental conditions on bacterial microbiota when investigating the specific impact of contaminants on bacterial communities, we investigated the bacterial community in the gut of terrestrial isopods (Porcellio scaber, Isopoda, Crustacea) from clean and metal-polluted environments. Animals were collected from a chronically mercury-polluted site, a chronically multiple metal-(Cd, Pb, Zn) polluted site, and two reference sites. In addition, animals from an unpolluted site were laboratory exposed to 5 microg Hg/g food in order to compare the effect of acute and chronic Hg exposure. The bacterial gut microbiota was investigated by temporal temperature gradient gel electrophoresis (TTGE) and clone library construction based on polymerase chain reaction amplified 16S rRNA genes. The major bacterial representatives of the emptied gut microbiota in the animals from the chronically polluted environments seemed not affected when analyzed by TTGE. The detailed bacterial community structure investigated by 16S rRNA clone library construction, however, showed that the community from the Hg-polluted site also was affected severely (242.4 operational taxonomic units [OTU] in the polluted and 650.6 OTU in the unpolluted environment). When animals were acutely exposed to mercury, changes of bacterial community structures already were seen on TTGE profiles and no additional analysis was needed. We suggest the use of P. scaber gut bacterial community structure as a measure of effects caused by both long- and short-term exposure to pollution.

  6. Alona iheringula Sinev & Kotov, 2004 (Crustacea, Anomopoda, Chydoridae, Aloninae: life cycle and DNA barcode with implications for the taxonomy of the Aloninae subfamily.

    Directory of Open Access Journals (Sweden)

    Erika dos Santos Silva

    Full Text Available Knowledge of reproductive rates and life cycle of the Cladocera species is essential for population dynamic studies, secondary production and food webs, as well as the management and preservation of aquatic ecosystems. The present study aimed to understand the life cycle and growth of Alona iheringula Kotov & Sinev, 2004 (Crustacea, Anomopoda, Chydoridae, a Neotropical species, as well as its DNA barcoding, providing new information on the Aloninae taxonomy. The specimens were collected in the dammed portion of the Cabo Verde River (21°26'05″ S and 46°10'57″ W, in the Furnas Reservoir, Minas Gerais State, Brazil. Forty neonates were observed individually two or three times a day under controlled temperature (25±1°C, photoperiod (12 h light/12 h dark and feeding (Pseudokirchneriella subcapitata at a concentration of 105 cells.mL-1 and a mixed suspension of yeast and fish feed in equal proportion. Individual body growth was measured daily under optical microscope using a micrometric grid and 40× magnification. The species had a mean size of 413(±29 µm, a maximum size of 510 µm and reached maturity at 3.24(±0.69 days of age. Mean fecundity was 2 eggs per female per brood and the mean number of eggs produced per female during the entire life cycle was 47.6(±6.3 eggs per female. The embryonic development time was 1.79(±0.23 days and the maximum longevity was 54 days. The species had eight instars throughout its life cycle and four instars between neonate and primipara stage. The present study using molecular data (a 461 bp smaller COI fragment demonstrated a deep divergence in the Aloninae subfamily.

  7. Latitudinal patterns in the diversity of two subgenera of the genus Daphnia O.F. Müller (Crustacea: Cladocera: Daphniidae).

    Science.gov (United States)

    Popova, Ekaterina Y; Kotov, Alexey A

    2013-11-12

    Daphnia O.F. Müller (Crustacea: Cladocera: Daphniidae) is an important model in biology. It was concluded earlier that subgenus Daphnia s.str. occurs mainly in the northern hemisphere, subgenus Daphnia (Ctenodaphnia) in the southern hemisphere, which could suggest that: (1) the subgeneric differentiation is correlated with the Laurasia-Gondwanaland subdivision and (2) D. (Ctenodaphnia) is a taxon of Gondwanian origin. Some authors even discussed mechanisms of maintaince of the "ancient subgeneric north-south split", regarding such a pattern as paradoxical. But both molecular clock calculations and fossils of both subgenera from the Jurassic/Cretaceous boundary of Mongolia compromise such ideas and suggest an earlier, Pangaean, differentiation of the subgenera.        We discuss the distribution of Daphnia worldwide based on recent literature. Our analysis covers literature data on all described and on undescribed taxa revealed by genetical methods. Distributional data were associated with five main zones: southern cold (I), southern temperate (II), tropical (III), northern temperate (IV), and northern cold (V) zone. We found no "subgeneric north-south split": the distribution of Daphnia s.str. is dissymmetric between the hemispheres (antipolar), while that of Ctenodaphnia is sub-symmetric (bipolar). We suggest that both patterns are not of Mesozoic, but of Cenozoic origin. Mesozoic differentiation of the subgenera does not contradict a recent origin of the extant species, as found in e.g. Notostraca. A superficially attractive hypothesis about a Gondwanian origin of a taxon (Daphnia (Ctenodaphnia)) therefore did not pass the test of the fossil records. In addition, we agree with the opinion that an antipolar is only a variant of a bipolar pattern, as a result of an extinction in the southern hemisphere, and that these patterns are mid-late Cenozoic instead of Mesozoic.

  8. Nervous system development in the fairy shrimp Branchinella sp. (Crustacea: Branchiopoda: Anostraca): Insights into the development and evolution of the branchiopod brain and its sensory organs.

    Science.gov (United States)

    Frase, Thomas; Richter, Stefan

    2016-11-01

    Using immunohistochemical labeling against acetylated a-tubulin and serotonin in combination with confocal laser scanning microscopy and 3D-reconstruction, we investigated the temporary freshwater pond inhabitant Branchinella sp. (Crustacea: Branchiopoda: Anostraca) for the first time to provide detailed data on the development of the anostracan nervous system. Protocerebral sense organs such as the nauplius eye and frontal filament organs are present as early as the hatching stage L0. In the postnaupliar region, two terminal pioneer neurons grow from posterior to anterior to connect the mandibular neuromeres. The first protocerebral neuropil to emerge is not part of the central complex but represents the median neuropil, and begins to develop from L0+ onwards. In stage L3, the first evidence of developing compound eyes is visible. This is followed by the formation of the visual neuropils and the neuropils of the central complex in the protocerebrum. From the deutocerebral lobes, the projecting neuron tract proceeds to both sides of the lateral protocerebrum, forming a chiasma just behind the central body. In the postnaupliar region, the peripheral nervous system, commissures and connectives develop along an anterior-posterior gradient after the fasciculation of the terminal pioneer neurons with the mandibular neuromere. The peripheral nervous system in the thoracic segments consists of two longitudinal neurite bundles on each side which connect the intersegmental nerves, together with the ventral nervous system forming an orthogon-like network. Here, we discuss, among other things, the evidence of a fourth nauplius eye nerve and decussating projecting neuron tract found in Branchinella sp., and provide arguments to support our view that the crustacean frontal filament (organ) and onychophoran primary antenna are homologous. J. Morphol. 277:1423-1446, 2016. © 2016 Wiley Periodicals, Inc.

  9. Single and combined effects of cadmium and arsenate in Gammarus pulex (Crustacea, Amphipoda): Understanding the links between physiological and behavioural responses

    Energy Technology Data Exchange (ETDEWEB)

    Vellinger, Céline, E-mail: celine.vellinger@gmail.com [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Gismondi, Eric, E-mail: gismondi.eric@gmail.com [Laboratoire d’Ecologie animale et d’Ecotoxicologie, Institut de Chimie, Université de Liège, Allée du 6 Août 15, B-4000 Sart-Tilman, Liège (Belgium); Felten, Vincent, E-mail: vincent.felten@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Rousselle, Philippe, E-mail: rousselle@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Mehennaoui, Kahina, E-mail: meh_kahina@yahoo.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Parant, Marc, E-mail: parant@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Usseglio-Polatera, Philippe, E-mail: usseglio-polatera@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France)

    2013-09-15

    Highlights: •Linking physiological to behavioural responses of G. pulex exposed to AsV and/or Cd. •AsV and/or Cd exposure exhibited similar biomarkers responses. •Contamination increases the mobilization of detoxification systems in gammarids. •Both changes in energy reserve use and allocation are involved in gammarid response. •Increased lipid peroxidation could be the cause of increasing gammarid mortality. -- Abstract: This study aimed at investigating the individual and interactive effects of cadmium (Cd) and arsenate (AsV) in Gammarus pulex (Crustacea, Amphipoda) through the use of several biomarkers. Individuals were exposed for 240 h to two concentrations of AsV or Cd alone, and all the possible binary mixtures of these concentrations of AsV and Cd in a complete factorial design. The pattern of the biomarkers’ responses to Cd and AsV alone or in mixture was similar in Gammarus pulex, even if the response intensity varied depending on the tested conditions. G. pulex responded to contamination with increased mobilization of the detoxification systems [i.e. γ-glutamyl-cystein ligase activity (GCL), reduced glutathione content (GSH) and metallothionein concentrations (MT)]. This response seems to imply changes in energy reserve utilization (total lipids and proteins are used prior to glycogen reserves), but also a possible energy reallocation from locomotion to detoxification processes. The observed increase in lipid peroxidation could be relied to the increasing gammarid mortality, despite the higher mobilization of detoxification systems. Even if the outcome of the complex interactions between AsV and Cd remains difficult to unravel, such studies are critically important for better assessing the effects of stressors on organisms, populations and communities in a multi-contamination context of ecosystems.

  10. Les Cahiers du Littoral, Unité de Recherche sur l’Histoire, les Langues, les Littératures et l’Interculturel (H.L.L.I. de l’Université du Littoral Côte d’Opale, Aachen, Shaker Verlag, No. 7 / 2010

    Directory of Open Access Journals (Sweden)

    Speranţa Sofia MILANCOVICI

    2012-01-01

    Full Text Available Colectivul editorial al caietelor publicate de către unitatea de cercetare în domeniul istoriei, limbilor străine, literaturilor şi interculturalităţii, din cadrul Universităţii Littoral Côte d’Opale, propune, pentru fiecare număr, o tematică incitantă şi de actualitate. Aducem în discuţie subiectul numărului 7/2010, Technique et éthique : le défi de la culture à la nature, volum care pune în discuţie modul în care progresul tehnic se raportează la ideea de etică.Pornind de la consideraţia potrivit căreia tehnica a fascinat mereu fiinţa umană, aceasta din urmă ajungând, în contemporaneitate, să trăiască într-o tehnosferă care îl îndepărtează de nevoile sale fundamentale, veritabile, autorii studiilor abordează această problemă din multiple perspective, specifice ariilor individuale de competenţă.Aşadar, profilul de ansamblu al acestui număr este unul pluridisciplinar.Fireşte, opoziţia artă-industrie a focalizat de-a lungul vremii energiile analitice ale specialiştilor. Insă acum, în era globalizării, a comunicării superficiale şi inegale (în studiul său dedicat problemei etice în tehnologiile informaţiei, cercetătoarea Odile Riondet notează faptul că, potrivit unui raport UNESCO, în zona Manhattan există mai multe telefoane decât în întreaga Africă Neagră acest raport trebuie reevaluat.

  11. Isognomon bicolor (C.B. Adams (Bivalvia, Isognomonidae: primeiro registro para o Brasil, redescrição da espécie e considerações sobre a ocorrência e distribuição de Isognomon na costa brasileira Isognomon bicolor (C.B. Adams (Bivalvia, Isognomonidae: first record to the Brazilian littoral, redescription of the species and comments on the occurrence and distribution of Isognomon in the Brazilian coast

    Directory of Open Access Journals (Sweden)

    Osmar Domaneschi

    2002-06-01

    Full Text Available The bivalve family Isognomonidae is represented in the Western Atlantic by the living genera Crenatula Lamarck, 1804 and Isognomon Solander, 1786. I. alatus (Gmelin, 1791 and I. radiatus (Anton, 1839 are the only Isognomonidae referred to the Brazilian malacofauna. The present work refers to the first record and geographic distribution of I. bicolor along the Brazilian littoral, and presents a re-description of the species based on shell characters, which include those of the prodissoconch. The occurrence of I. alatus and I. radiatus along the Brazilian littoral could not be confirmed, despite the intensive search for these Isognomonidae from Rio Grande do Norte through Rio Grande do Sul.

  12. Influência da Serra do Mar na distribuição e biologia de Aeglidae (Crustacea, Anomura) na porção leste do Estado do Paraná

    OpenAIRE

    2013-01-01

    Resumo: Um estudo sobre os padrões de distribuição dos eglídeos (Crustacea, Anomura, Aeglidae) com ocorrência no Estado do Paraná e a variação intraespecífica morfológica de Aegla schmitti dentre populações isoladas pelo conjunto de montanhas da Serra do Mar foi realizado. A análise do padrão de distribuição foi realizado principalmente com base em visitas à coleções científicas, porém coletas adicionais foram realizadas, especialmente nas bacias hidrográficas dos rios Iguaçu, Ribeira do Igua...

  13. Early metal pollution in southwestern Europe: the former littoral lagoon of El Almarjal (Cartagena mining district, S.E. Spain).A sedimentary archive more than 8000 years old.

    Science.gov (United States)

    Manteca, José-Ignacio; Ros-Sala, Milagros; Ramallo-Asensio, Sebastián; Navarro-Hervás, Francisca; Rodríguez-Estrella, Tomás; Cerezo-Andreo, Felipe; Ortiz-Menéndez, José-Eugenio; de-Torres, Trinidad; Martínez-Andreu, Miguel

    2017-04-01

    A borehole drilling campaign has allowed the study of a former littoral lagoon located next to the harbour city of Cartagena in South-East Spain (close to the Sierra de Cartagena polymetallic ore deposits). This lagoon, which developed during the Holocene, was first a shallow sedimentary marine environment and later evolved into a swampy semi-endorheic basin named "Almarjal" (after the Arab term from the fourteenth century). The lagoon eventually dried out and at present forms part of the substratum of the modern sector of the city urban area. The basin representative sediments are sapropelic black silty facies forming a continuous sedimentary archive, accounting for more than 8000 years of depositional phenomena. The geochemical study of these sediments, together with their absolute calibrated dating by (14)C, allows definition of successive stages of mining and metallurgical activities in the area. In turn, this information provides a more comprehensive perspective regarding metal pollution, particularly lead contamination during different periods of the Recent Prehistory and the Classical Age. The results indicate that the beginning of contamination by lead and other heavy metals occurred as early as 4500 years ago, when the Final Chalcolithic period was taking place in the South-East of the Iberian Peninsula. This finding provides further insights regarding the debate on the origins of lead mining and metallurgy in SE Spain.

  14. Sources et impacts potentiels des micropolluants chimiques sur un écosystème littoral exploité: l'exemple des côtes des Charente-Maritime

    Science.gov (United States)

    Miramand, P.; Guyot, T.; Pigeot, J.

    2003-06-01

    Le littoral picto-charentais est une zone à fortes activités économiques liées à l'aquaculture, à la pêche et au tourisme. Toutes ces activités demandent une très bonne qualité des eaux et de l'environnement en général. Or, cette zone littorale est soumise à de nombreux apports de micropolluants: métaux lourds, phytosanitaires, hydrocarbures, organochlorés.... Les sources en sont nombreuses: apports fluviatiles et atmosphériques, rejets diffus et rejets directs. Les risques dus à cette pollution sont multiples que ce soit au niveau dcs organismes, au niveau des écosystèmes ou des consommateurs. De ce fait, les contaminants majeurs (métaux lourds, organochlorés. hydrocarbures aromatiques polycycliques) et leurs impacts éventuels sur les écosystèmes font l'objet de veille environnementale (réseaux de surveillance ou d'observatoires de l'environnement) et de mesures de prévention se traduisant par la définition de normes de rejets ou de contamination décidées à l'échelle européenne.

  15. Padrão de deslocamento do camarão marinho Litopenaeus vannamei (Boone (Crustacea, Decapoda, Penaeidae nas fases clara e escura ao longo de 24 horas Displacement pattern of marine shrimp Litopenaeus vannamei (Boone, 1931 (Crustacea, Decapoda, Penaeidae in light and dark phases during a 24-hour period

    Directory of Open Access Journals (Sweden)

    Cibele S. Pontes

    2006-03-01

    Full Text Available O padrão diário de atividade de Litopenaeus vannamei (Boone, 1931 (Crustacea, Decapoda, Penaeidae é ainda pouco entendido. Com o objetivo de fornecer subsídios para otimizar o manejo nas fazendas de cultivo através do estudo do comportamento deste animal, foram desenvolvidos experimentos com juvenis (7,57 ± 1,01 g, mantidos em aquários (30 l. Para registro da atividade, os aquários foram submetidos a fotoperíodo artificial (fase do claro e do escuro, 12h:12 h, sendo monitorados 16 camarões (33 m² em cada fase, durante 20 dias, em janelas de 15 min a cada hora. A alimentação foi fornecida em horários aleatórios, sendo registrados os deslocamentos horizontal e vertical (focal contínuo e os comportamentos de natação e exploração (focal instantâneo. Os deslocamentos horizontal e vertical dos camarões foram mais acentuados na fase escura, predominando o comportamento de natação. A exploração do substrato ocorreu em ambas fases, acentuando-se entre cinco e sete horas após o acendimento das luzes.Litopenaeus vannamei (Boone, 1931 daily behavior pattern is still poorly understood. With the aim of optimizing the management of shrimp farms through the study of this animal behavior, experiments were performed with juvenile (7.57 ± 1.01, which were marked and kept in aquariums (30 l. To record activity, the aquariums were submitted to an artificial photoperiod (light and dark phases, 12h:12 h, with 16 shrimp (33 m² monitored in each phase for 20 days, for 15-minute periods every hour. Food was provided at random times and a record kept of horizontal and vertical displacement (continuous focal, swimming and exploration behavior (instantaneous focal. The horizontal and vertical displacements of the shrimp were greater during the dark phase, with a predominance of the swimming behavior. Exploration of the substrate occurred in both phases, with a peak between five and seven hours after the lights were turned on.

  16. The Relationship between Phytoplankton and Related Environmental Factors in the Littoral Zone of Wannianbu, Chaohu Lake%巢湖万年埠沿岸浮游植物与环境因子关系

    Institute of Scientific and Technical Information of China (English)

    宗梅; 郑西强; 王翔宇

    2016-01-01

    Objective] To study on the relationship between phytoplankton and related environmental factors.[Method] Statistics and envi-ronmental factors analysis of phytoplankton were carried in the littoral zone of Wannianbu, Chaohu Lake from January to October in 2010.Re-dundancy analysis was applied to explore the relationship between phytoplankton and related environmental factors using CANOCO 4.5.The species-environment biplots were drawn based on the result of RDA.[ Result] The results showed that phytoplankton had 63 species belong to 43 genera of 8 phyla.The phytoplankton community was dominated by Cyanophyta, Cyanophyta, Cryptophyta and Chlorophyta.The phyto-plankton had an abundance ranging from 1.51 ×106 to 200.00 ×106 cells/L.Microcystis and Anabaena were remarkably affected by TN and NO3-N during Jan.-Apr..However, Microcystis and Anabaena were remarkably affected by T, pH, TP, PO4-P, DTP and TN During May-Oct.[ Conclusion] The study can provide scientific basis for algal bloom control in Chaohu Lake.%[目的]研究沿岸浮游植物与环境因子的关系。[方法]于2015年1~12月在巢湖西半湖万年埠进行了浮游植物统计和相关环境因子监测分析。应用CANOCO 4.5软件对获得的浮游植物数据和环境因子数据进行了RDA分析,并作出了物种分布和环境因子关系的二维排序图。[结果]共鉴定出浮游植物8门43属63种,群落组成以蓝藻、硅藻、隐藻和绿藻为主,月藻类密度为1.51×106~200.00×106个/L。 RDA分析表明,1~4月,微囊藻和鱼腥藻主要受TN和NO3-N的影响,而5~10月,微囊藻和鱼腥藻主要受T、pH、TP、PO4-P、DTP和TN的影响。[结论]该研究为巢湖水华治理提供了科学依据。

  17. Conducting Expeditionary Operations in the Contested Littorals

    Science.gov (United States)

    2015-10-21

    of the world in a short period of time to wage asymmetric and flexible warfare in a myriad of changing battlefield scenarios. The key...capabilities for waging irregular warfare (Mullen 2009). Our force is will be tasked with a mission that has not been required since the end of World...Predator (from Jane’s 2014)/ Figure 74. Table 46. MQ-1 Predator Specifications (after Predator 2010). Range 669 NM (770 mi) Ceiling 25,000 ft Speed

  18. Radar tracking and classification of littoral targets

    Science.gov (United States)

    Silvious, Jerry; Tahmoush, Dave

    2012-06-01

    Radar can provide inexpensive wide-area surveillance of river and port traffic for both security and emergency response. We demonstrate the tracking of multiple vessels as well as the micro-Doppler signatures of different classes of small vessels, including kayaks and zodiacs. The pattern of life of a river is analyzed over several days and can be used to easily identify suspicious or unusual cases.

  19. EO System Concepts in the Littoral

    NARCIS (Netherlands)

    Schwering, P.B.W.; Broek, S.P. van den; Iersel, M. van

    2007-01-01

    In recent years, operations executed by naval forces have taken place at many different locations. At present, operations against international terrorism and asymmetric warfare in coastal environments are of major concern. In these scenarios, the threat caused by pirates on-board of small surface ta

  20. Studies on littoral flora of Andaman Islands

    Digital Repository Service at National Institute of Oceanography (India)

    Jagtap, T.G.

    Marine macrophytes of Andaman islands were qualitatively surveyed. In all 40 genera, 64 species of marine algae, 17 genera, 22 species of mangroves while 3 genera, 3 species of seagrasses are reported. There were 26 species of rhodophyta, 21 species...

  1. Santa Barbara Littoral Cell CRSMP Beaches 2009

    Data.gov (United States)

    California Department of Resources — Several criteria were used for beach selection. BEACON 's Coastal Regional Sediment Management Plan included all of the most popular beaches in the two counties...

  2. Phycoerythrin Signatures in the Littoral Zone

    Science.gov (United States)

    2007-09-30

    adaptation, previously unreported in cyanobacteria (Everroad & Six et al., 2006). However, we also found that these strains co-occurred in a diverse...traditionally used provide resolution of the phylogenetic history of prokaryotes as several levels or resolution. The third genetic marker we use are the co...indication of phylogenetic history and identify strains with common ancestry. As noted earlier, we sequenced the cpeBA and mpeBA genes because they

  3. Littoral Combat Ship (LCS) Manpower Requirements Analysis

    Science.gov (United States)

    2004-12-01

    CONTROLMAN FC FIRE CONTROLMAN FC LCS SEAFRAME Billet Title Rate Engineering Dept SHP ENG GASTBN OFF DC ASST OFF MPA GASTURBINE OFF AUX MACH OFF...Leverage Alignment Billet Title Rate Rate Rate Rate Rate Rate Engineering Dept SHP ENG GASTBN OFF OFF OFF OFF OFF OFF DC ASST OFF OFF OFF OFF MPA GASTURBINE

  4. Littoral Combat Ship Mission Modules (LCS MM)

    Science.gov (United States)

    2015-12-01

    2017 and IOT &E will occur in FY 2018. This schedule change will still support the Navy’s planned first deployment of the ASW MP in FY 2019. The LCS...Operational Test & Evaluation will occur in FY 2018. This schedule change will still support the Navy’s planned first deployment of the ASW MP in...Successfully completed Phase 1 of Initial Operational Test & Evaluation ( IOT &E) of SUW MP Increment 2 aboard USS Coronado (LCS 4) on September 25

  5. Santa Barbara Littoral Cell CRSMP Beaches 2009

    Data.gov (United States)

    California Department of Resources — Several criteria were used for beach selection. BEACON 's Coastal Regional Sediment Management Plan included all of the most popular beaches in the two counties...

  6. The cross-sectional investigation on health condition of the officers and soldiers from littoral army in Liao Ning Province%辽宁省沿海地区部队官兵亚健康状况的调查

    Institute of Scientific and Technical Information of China (English)

    向阳; 周琳; 宋伟娜; 李海霞; 张励; 常晓慧; 王晓波; 黄世林

    2011-01-01

    目的 调查辽宁省沿海地区部队官兵的亚健康状况及影响因素.方法 应用整群抽样方法,采用自行设计包括20项自觉症状的健康调查表进行问卷调查与分析.结果 在辽宁省沿海地区接受调查的3170例部队官兵中20项自觉症状均有发生,但发生率不同,其中,烦躁、头晕、情绪低落、乏力、失眠列居前5位,发生率分别为36.5%、31.6%、31.0%、30.7%和27.4%;不同职务、兵种、服役期和文化程度官兵的5种常见自觉症状的发生率各不相同,其中,干部烦躁、情绪低落高于战士,发生率分别为54.5%和36.1%、44.2%和30.7%(P<0.05);海军官兵烦躁、头晕、情绪低落、乏力、失眠的发生率分别是48.8%、39.6%、43.1%、38.2%和32.9%,高于陆军、空军(P<0.05);服役期≥9年官兵的烦躁、情绪低落、乏力和失眠的发生率为46.9%、46.0%、45.1%、38.1%,服役3~8年的官兵头晕发生率为40.4%,高于服役期≤2年、≥9年的官兵(P<0.05);具有大学及以上学历官兵的烦躁、情绪低落、乏力发生率分别为52.5%、43.3%、42.5%,高于其他学历的官兵(P<0.05).影响因素涉及职务、兵种、服役期和文化程度,但最重要的影响因素是服役期.结论 部分官兵的健康状况存在问题,且受到职务、兵种、文化程度,尤其是服役期等因素的影响,对服役期>2年的官兵应积极采取预防措施,加强健康教育,定期开展健康体检工作.%Objective To investigate health condition of the officers and soldiers from littoral army in Liao Ning Province and influencing factor. Methods The cluster sampling was used. The self-designing health questionnaires were applied to this investigation. The questionnaire included 20 subjective symptoms, which were relevant with hematological system and digestive system diseases. Results Twenty subjective symptoms listed in the questionnaire all appeared among

  7. Biologia e pesca do camarão sete-barbas Xiphopenaeus kroyeri (Heller (Crustacea, Penaeidae, na Armação do Itapocoroy, Penha, Santa Catarina, Brasil Fishery and Biology of the sea-bob-shrimp Xiphopenaeus kroyeri (Heller (Crustacea, Penaeidae, at Armação do Itapocoroy, Penha, Santa Catarina, Brazil

    Directory of Open Access Journals (Sweden)

    Joaquim O. Branco

    2005-12-01

    Full Text Available A pesca artesanal do camarão sete-barbas é denominada "pesca de sol a sol" e realizada em grande escala no litoral brasileiro, apresentando uma significativa importância econômica, histórica, social e cultural. Atualmente, a pesca desse camarão é considerada a de maior interesse econômico e o segundo recurso pesqueiro nas regiões Sudeste-Sul do Brasil. Com o objetivo de estudar a biologia e pesca do camarão sete-barbas na Armação do Itapocoroy, Penha (26º40'-26º47'S e 48º36'-48º38'W, durante o período de agosto de 1996 a julho de 2003 foram realizadas coletas mensais com 30 minutos de duração. Foram registrados o número e a biomassa dos exemplares por arrasto, e entre anos de 1996-1997 e 1999-2001, também foram anotados o sexo, o comprimento e peso total, estádio de maturação. Além dessas informações, entre agosto de 1998 a julho de 1999 foi analisado a dieta natural da espécie. X. kroyeri (Heller, 1862 apresentou comprimento total variando entre 3,0 e 16,0 cm e flutuações sazonais na abundância e biomassa, com as maiores taxas de captura ocorreram durante os meses de verão e outono. A relação peso/comprimento indicou um padrão de crescimento tendendo ao isométrico com tamanho de primeira maturação entre 7,3 a 7,9 cm, alcançados em seis meses de idade. A espécie apresentou dois picos de desova ao longo do ano, sendo que a pesca artesanal vem atuando com maior intensidade sobre o estoque adulto. O espectro trófico foi composto por 30 itens, sendo que os Gammaridae, areia, outros Crustacea e matéria orgânica os elementos básicos na dieta da espécie. Em média, 67,82 barcos atuam durante oito meses por ano na pesca do camarão sete-barbas na Armação do Itapocoroy, podendo capturar em torno de 170 toneladas/ano.The artisanal fishery of the sea-bob-shrimp is known as "sun to sun fishery" and is developed in large scale along the Brazilian coast, playing a significant economic, historical, social and

  8. Investigation on expiration time of sterile packages of strategic reserve between inland region and littoral under natural environment%内陆与沿海地区自然环境中战备消毒包储存时限的实验研究

    Institute of Scientific and Technical Information of China (English)

    张颖; 王仙园; 周娟

    2011-01-01

    Objective To study expiration time and the origin of bacteria for the sterile packages of strategic reserve between inland region and littoral under natural environment.Methods We prepared operation dressing package,apparatus package as well as dressing and apparatus mixed package with double- cotton and to be deposited in storage boxes of combat readiness warehouse under natural environment after pulsing vacuum steam sterilization.Three packages of every kind were put in a storage boxes and samples were taken from the packages and underwent bacterial culture at different time-points.Meanwhile,the bacteria strains in combat readiness warehouse' air and in the storage boxes were cultured and performed with homology analysis.Results Expiration time of sterile packages of strategic reserve was 40d in inland region whereas 24d in littoral.The major bacteria were G+ bacilli and G+ staphylococus in sterile packages of strategic reserve,combat readiness warehouse' air and storage boxes in two regions.In inland region,the 16~23SrRNA ITS sequences of bacteria strains in sterile packages shared about 97%~100% homology with which between the air bacteria strains in combat readiness warehouse and the storage boxes whereas it was about 98%~99% homology in littoral.Conclusions The storage environment is the most influential factor on expiration time of sterile packages of strategic reserve.The bacteria in sterile packages of strategic reserve came from the air of combat readiness warehouse.To ensure the expiration time of sterile package of strategic reserve,corresponding management methods are important guarantee which can provide new methods about management on strategic reserve.%目的 探讨战备消毒包在内陆和沿海地区自然环境中的储存时限及细菌的来源.方法 准备双层棉布手术敷料包、器械包、敷料器械混合包,预真空压力蒸气灭菌后分别存放在自然环境战备仓库储存箱内,分别于灭

  9. 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

    Directory of Open Access Journals (Sweden)

    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

  10. 辽宁省沿海地区3170名男性部队官兵血常规的现况调查%A cross-sectional investigation on blood count of 3 170 male officers and soldiers from littoral army in Niaoning Province

    Institute of Scientific and Technical Information of China (English)

    向阳; 李海霞; 常晓慧; 张德杰; 成玉斌; 陈爱萍; 王晓波; 黄世林

    2013-01-01

    OBJECTIVE To investigate the current situation on blood count of the officers and soldiers from littoral army in Niaoning Province.METHODS The venous blood about 3ml/one person from the 3 170 male officers and soldiers were collected by cluster sampling method and the white blood cell (WBC),red blood cell (RBC),Hb and s platelets (PLT) were detected.RESULTS Among the 3 170 officers and soldiers,WBC,RBC,Hb,PLT were (6.6 ± 1.6) ×109/L,(5.3 ± 1.2) ×1012/L,(148.1 ± 13.8) g/L,(211.2 ± 52.1) ×109/L respectively.The abnormality detection rates of WBC,RBC,Hb,PLT were 5.6%,12.8%,14.2% and 6.2% respectively and Hb was highest among others.The abnormality detection rates of WBC,RBC,PLT form army was higher than navy and air-force while Hb form navy was higher than navy and airforce.CONCLUSIONS The chief indexes of blood count such as WBC,RBC,Hb,PLT of the officers and soldiers detected from littoral army maintain normal level.%目的 调查辽宁省沿海地区部队官兵血常规的现状.方法 采用整群抽样方法,采集3 170名陆海空男性官兵的静脉血2ml,检测白细胞(WBC)、红细胞(RBC)、血红蛋白(Hb)、血小板(PLT).结果 (1)受检官兵的WBC、RBC、Hb、PLT分别为(6.6±1.6)×109/L、(5.3±1.2)×1012/L、(148.1±13.8) g/L、(211.2±52.1)×109/L; (2) WBC、RBC、Hb和PLT异常检出率分别为5.6%、12.8%、14.2%和6.2%,其中Hb异常检出率居于首位; (3)陆军WBC、RBC、PLT的异常检出率高于海军和空军,分别为5.9%、14.2%、6.5%,Hb的异常检出率则以海军最高,为31.3%,其次为空军、陆军.结论 受检官兵WBC、RBC、Hb和PLT 4项血常规的主要指标均在正常检测范围.

  11. The cavernicolous Oniscidea (Crustacea: Isopoda) of Portugal

    DEFF Research Database (Denmark)

    P. S. Reboleira, Ana Sofia; Gonçalves, Fernando J.; Oromí, Pedro

    2015-01-01

    The study of subterranean Oniscidea in Portugal has been neglected for nearly 70 years, but recent investigations have revealed high diversity. All the terrestrial isopods known from caves of mainland Portugal, including data from the literature and new material, are listed, revealing new biodive...

  12. The Caridean Crustacea of the Canary Islands

    NARCIS (Netherlands)

    Holthuis, L.B.

    1949-01-01

    The present paper is based mainly on material collected at the Canary Islands during the spring of 1947 by Dr. G. Thorson of Universitetets Zoologiske Museum at Copenhagen and Dr. C. O. van Regteren Altena of the Rijksmuseum van Natuurlijke Historie at Leiden. Most of the specimens were collected by

  13. Die Gattung Stenothoe (Crustacea, Amphipoda) im Mittelmeer

    NARCIS (Netherlands)

    Krapp-Schickel, Gertraud

    1976-01-01

    Ausgangssituation dieser Untersuchung war die Kenntnis von 11 nominellen Stenothoe-Arten im Mittelmeer. Von diesen wurde St. bosphorana Sowinski, 1898, seit der Beschreibung nicht mehr wiedergefunden, von St. dactylipotens Chevreux, 1908, kannte man nur das ♀, schließlich waren die Arten im Komplex

  14. The cavernicolous Oniscidea (Crustacea: Isopoda of Portugal

    Directory of Open Access Journals (Sweden)

    Ana Sofia P.S. Reboleira

    2015-12-01

    Full Text Available The study of subterranean Oniscidea in Portugal has been neglected for nearly 70 years, but recent investigations have revealed high diversity. All the terrestrial isopods from caves of mainland Portugal, including data from the literature and new material, are listed, revealing new biodiversity patterns. Twenty-seven species, belonging to 15 genera and six families, are known, of which 16 species are considered to be exclusively from subterranean ecosystems, i.e., troglobionts. Trichoniscidae is the most diverse family. Seven species in the family Trichoniscidae and one species in the family Styloniscidae are described as new (all with Reboleira & Taiti as authors: Trichoniscoides bellesi sp. nov. from the Montejunto Massif; T. sicoensis sp. nov. from the Sicó Massif; Metatrichoniscoides salirensis sp. nov. from the typhonic valley of Caldas da Rainha; Troglonethes olissipoensis sp. nov. from the Lisbon Peninsula; T. arrabidaensis sp. nov. from the Arrábida Massif; Miktoniscus longispina sp. nov. from the Sicó Massif and Cesaredas Plateau; Moserius inexpectatus sp. nov. from the Estremenho Massif; and Cordioniscus lusitanicus sp. nov. from Alentejo and Algarve, the southernmost provinces of Portugal. The subgenus Trogleluma Vandel, 1946 (Armadillidiidae is raised to genus level. In this geographic region terrestrial isopods are the richest group of cave-adapted animals.

  15. A transgenerational endocrine signaling pathway in Crustacea.

    Directory of Open Access Journals (Sweden)

    Gerald A LeBlanc

    Full Text Available BACKGROUND: Environmental signals to maternal organisms can result in developmental alterations in progeny. One such example is environmental sex determination in Branchiopod crustaceans. We previously demonstrated that the hormone methyl farnesoate could orchestrate environmental sex determination in the early embryo to the male phenotype. Presently, we identify a transcription factor that is activated by methyl farnesoate and explore the extent and significance of this transgenerational signaling pathway. METHODOLOGY/PRINCIPAL FINDINGS: Several candidate transcription factors were cloned from the water flea Daphnia pulex and evaluated for activation by methyl farnesoate. One of the factors evaluated, the complex of two bHLH-PAS proteins, dappuMet and SRC, activated a reporter gene in response to methyl farnesoate. Several juvenoid compounds were definitively evaluated for their ability to activate this receptor complex (methyl farnesoate receptor, MfR in vitro and stimulate male sex determination in vivo. Potency to activate the MfR correlated to potency to stimulate male sex determination of offspring (pyriproxyfen>methyl farnesoate>methoprene, kinoprene. Daphnids were exposed to concentrations of pyriproxyfen and physiologic responses determined over multiple generations. Survivial, growth, and sex of maternal organisms were not affected by pyriproxyfen exposure. Sex ratio among offspring (generation 2 were increasingly skewed in favor of males with increasing pyriproxyfen concentration; while, the number of offspring per brood was progressively reduced. Female generation 2 daphnids were reared to reproductive maturity in the absence of pyriproxyfen. Sex ratios of offspring (generation 3 were not affected in this pyriproxyfen lineage, however, the number of offspring per brood, again, was significantly reduced. CONCLUSIONS: Results reveal likely components to a hormone/receptor signaling pathway in a crustacean that orchestrates transgenerational modifications to important population metrics (sex ratios, fecundity of females. A model is provided that describes how these signaling processes can facilitate population sustainability under normal conditions or threaten sustainability when perturbed by environmental chemicals.

  16. Phylomitogenomics of Malacostraca (Arthropoda:Crustacea)

    Institute of Scientific and Technical Information of China (English)

    SHEN Xin; TIAN Mei; YAN Binlun; CHU Kahou

    2015-01-01

    Along with the sequencing technology development and continual enthusiasm of researchers on the mitochondrial genomes, the number of metazoan mitochondrial genomes reported has a tremendous growth in the past decades. Phylomitogenomics—reconstruction of phylogenetic relationships based on mitochondrial genomic data—is now possible across large animal groups. Crustaceans in the class Malacostraca display a high diversity of body forms and include large number of ecologically and commercially important species. In this study, comprehensive and systematic analyses of the phylogenetic relationships within Malacostraca were conducted based on 86 mitochondrial genomes available from GenBank. Among 86 malacostracan mitochondrial genomes, 54 species have identical major gene arrangement (excluding tRNAs) to pancrustacean ground pattern, including six species from Stomatopoda, three species from Amphipoda, two krill, seven species from Dendrobranchiata (Decapoda), and 36 species from Pleocyemata (Decapoda). However, the other 32 mitochondrial genomes reported exhibit major gene rearrangements. Phylogenies based on Bayesian analyses of nucleotide sequences of the protein-coding genes produced a robust tree with 100%posterior probability at almost all nodes. The results indicate that Amphipoda and Isopoda cluster together (Edriophthalma) (BPP=100). Phylomitogenomic analyses strong support that Euphausiacea is nested within Decapoda, and closely related to Dendrobranchiata, which is also consistent with the evidence from developmental biology. Yet the taxonomic sampling of mitochondrial genome from Malacostraca is very biased to the order Decapoda, with no complete mitochondrial genomes reported from 11 of the 16 orders. Future researches on sequencing the mitochondrial genomes from a wide variety of malacostracans are necessary to further elucidate the phylogeny of this important group of animals. With the increase in mitochondrial genomes available, phylomitogenomics will emerge as an important component in the Tree of Life researches.

  17. The cavernicolous Oniscidea (Crustacea: Isopoda) of Portugal

    DEFF Research Database (Denmark)

    P. S. Reboleira, Ana Sofia; Gonçalves, Fernando J.; Oromí, Pedro;

    2015-01-01

    The study of subterranean Oniscidea in Portugal has been neglected for nearly 70 years, but recent investigations have revealed high diversity. All the terrestrial isopods known from caves of mainland Portugal, including data from the literature and new material, are listed, revealing new biodive...... provinces of Portugal. The subgenus Trogleluma Vandel, 1946 (Armadillidiidae) is raised to genus level. In this geographic region terrestrial isopods are the richest group of cave-adapted animals....

  18. The cavernicolous Oniscidea (Crustacea: Isopoda) of Portugal

    DEFF Research Database (Denmark)

    P. S. Reboleira, Ana Sofia; Gonçalves, Fernando J.; Oromí, Pedro

    2015-01-01

    The study of subterranean Oniscidea in Portugal has been neglected for nearly 70 years, but recent investigations have revealed high diversity. All the terrestrial isopods known from caves of mainland Portugal, including data from the literature and new material, are listed, revealing new biodive...

  19. Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10

    DEFF Research Database (Denmark)

    Just, Jean

    2012-01-01

    Two new genera and eight new species of bubocorophiid Siphonoecetini are described from north-eastern and northern Australia: Belkginoecetes bullockyensis gen. et sp. nov. B. cooee sp. nov. (type species), B. darwiniense sp. nov., B. fleurae sp. nov., B. solea sp. nov., B. springthorpei sp. nov.,...

  20. Phylogenetic systematics of the Eucarida (Crustacea malacostraca

    Directory of Open Access Journals (Sweden)

    Martin L. Christoffersen

    1988-01-01

    Full Text Available Ninety-four morphological characters belonging to particular ontogenetic sequences within the Eucarida were used to produce a hierarchy of 128 evolutionary novelties (73 synapomorphies and 55 homoplasies and to delimit 15 monophyletic taxa. The following combined Recent-fossil sequenced phylogenetic classification is proposed: Superorder Eucarida; Order Euphausiacea; Family Bentheuphausiidae; Family Euphausiidae; Order Amphionidacea; Order Decapoda; Suborder Penaeidea; Suborder Pleocyemata; Infraorder Stenopodidea; Infraorder Reptantia; Infraorder Procarididea, Infraorder Caridea. The position of the Amphionidacea as the sister-group of the Decapoda is corroborated, while the Reptantia are proposed to be the sister-group of the Procarididea + Caridea for the first time. The fossil groups Uncina Quenstedt, 1850, and Palaeopalaemon Whitfield, 1880, are included as incertae sedis taxa within the Reptantia, which establishes the minimum ages of all the higher taxa of Eucarida except the Procarididea and Caridea in the Upper Devonian. The fossil group "Pygocephalomorpha" Beurlen, 1930, of uncertain status as a monophyletic taxon, is provisionally considered to belong to the "stem-group" of the Reptantia. Among the more important characters hypothesized to have evolved in the stem-lineage of each eucaridan monophyletic taxon are: (1 in Eucarida, attachement of post-zoeal carapace to all thoracic somites; (2 in Euphausiacea, reduction of endopod of eighth thoracopod; (3 in Bentheuphausiidae, compound eyes vestigial, associated with abyssal life; (4 in Euphausiidae, loss of endopod of eighth thoracopod and development of specialized luminescent organs; (5 in Amphionidacea + Decapoda, ambulatory ability of thoracic exopods reduced, scaphognathite, one pair of maxillipedes, pleurobranch gill series and carapace covering gills, associated with loss of pelagic life; (6 in Amphionidacea, unique thoracic brood pouch in females formed by inflated carapace and specialized first pieopod, eclosion in zoea phase, body dorsoventrally depressed, thoracopods reduced and antennular statocyst lost, associated with planktonic life; (7 in Decapoda, double series of arthrobranchiae, laminar rostrum, acute stylocerite, two additional pairs of maxillipedes, three pairs of chelipedes and two pairs of walking legs, associated with nekto-benthonic life; (8 in Penaeidea, dendrobranchiae and post-larval mandibular palp expanded; (9 in Pleocyemata, pleopodal incubation of eggs and eclosion in zoea phase; (10 in Stenopodidea, pereiopodal exopods lost in adults and massive third chelipedes, associated with benthonic life; (11 in Reptantia + Procarididea + Caridea, pleura of second abdominal somite overlapping first and specialized setal brushes on propodus of fourth and fifth pereiopods; (12 in Reptantia, hypertrophied first chelipede, associated with benthonic life; (13 in Procarididea + Caridea, chela lost from third pereiopod and epipod-setobranch complexes for gill cleaning; (14 in Procarididea, chelae lost from first and second pereiopods; and (15 in Caridea, ocellus on ocular peduncle.

  1. On Parartemia zietziana Sayce (Crustacea Phyllopoda)

    NARCIS (Netherlands)

    Kuenen, D.J.

    1937-01-01

    On his journey to Australia, Prof. Dr. L. G. M. Baas Becking collected several specimens of Parartemia zietziana, which he kindly handed over to me for further examination. As it is a very little known species, the few details given below may add to our somewhat scanty knowledge. Sayce described thi

  2. Diversity of the Monstrilloida (Crustacea: Copepoda)

    Science.gov (United States)

    Suárez-Morales, Eduardo

    2011-01-01

    Monstrilloid copepods are protelean parasites of different groups of marine benthic invertebrates. Only their first naupliar, preadult, and adult phases are planktonic. Monstrilloids are currently represented by more than 115 nominal species contained in four genera. Its taxonomic knowledge has been hampered by nomenclatural and descriptive problems derived from their peculiar ontogeny and poor definitions of taxa. One of the most important difficulties is that of matching males to females. The only reliable methods to link the sexes of a species are the confirmation of particular apomorphies shared by both sexes, finding both sexes in the same host or as a pre-copulatory male-female pair in the plankton, or by the use of molecular markers. A general overview of the morphology of the group and its life cycle is provided herein. Recently, upgraded descriptive standards have been established and the relevance of redescribing taxa based on type and museum specimens has been demonstrated. The rate of species description per decade has had several peaks between 1840 and 2010: (1971–1980, 1991–2000, 2001–2010), each related to the activity of a few researchers. An analysis of the world distribution of published records of the Monstrilloida revealed that the Northeast Atlantic is the best studied region (45% of all records), followed by the Northwestern Atlantic (17%); the least surveyed areas include regions of the southern hemisphere (less than 3%). The Northeast Atlantic region harbors the highest number of known species (32 nominal species), followed by the Caribbean Sea/Gulf of Mexico (24), the Mediterranean/Black Sea (19), Indonesia-Malaysia-Philippines region (17), Japanese waters (17), and the Brazil-Argentina area (16). Other than these generalized patterns, little can be concluded concerning the biogeography of the group. Many species records are doubtful or improbable, and purportedly cosmopolitan nominal species are being revealed as species complexes yet to be studied. PMID:21853055

  3. Studies of mutations and polymorphism of PINK1 gene in patients with Parkinson' s disease in littoral of Zhejiang Province%浙江沿海温岭地区帕金森病PINK1基因突变与多态性研究

    Institute of Scientific and Technical Information of China (English)

    郑志华; 仇晨峰; 郑志辉; 林红霞

    2012-01-01

    目的 探讨浙江温岭地区帕金森病( Parkinson's disease,PD)患者PINK1基因突变和多态性分布特点,及其与PD的关系.方法 采用聚合酶链反应扩增200例PD组(早发性PD 112例、晚发性PD 88例)和220名相匹配的对照组(青年对照组68名、老年对照组152名)的PINK1基因1~8号外显子,并对扩增产物进行测序,斑点杂交法检测明确其基因型,计算其基因型频率和等位基因频率,并进行统计学分析.结果 未发现PD组和对照组出现PINK1基因外显子的缺失突变;在早发性PD组中有2例出现5号外显子杂合型突变(G12169A),发现该地区存在PINK1基因5号外显子G12164A,多态有G/G和G/A两种基因型,无A/A基因型,而G12101A多态有G/A和A/A两种基因型,无G/G基因型.PD组的PINK1基因5号外显子G12164A多态在A/A基因型频率84/200(42.0%)与对照组52/220(23.6%)相比有升高趋势(x2=4.034,P=0.045),在晚发性PD组中A/A基因型频率(40/88,45.5%)与老年对照组(32/152,21.1%)相比有升高趋势(x2=3.951,P=0.047),其余各组之间的等位基因频率比较差异均无统计学意义.结论 PINK1基因可能不是浙江温岭地区PD患者致病基因的突变热点;G12164A、G12101A连锁多态才是该地区晚发性PD患者的易患因素.%Objective To study deletion mutations and polymorphism of PINK1 gene exons in patients with Parkinson' s disease (PD) in the littoral of Zhejiang Province,and analyze the association between these changes and the etiology of PD.Methods All exons of PINK1 gene in 200 PD patients( 112early-onset PD and 88 late-onset PD) and 220 controls (68 young controls and 152 old controls ) were amplified by polymerase chain reaction (PCR). All the positive PCR products were sequenced,and genotypes were detected by dot blot allele and genotype frequencies of PINK1 were compared by the Chisquare test.Results No deletion mutations of the exons were found in all patients and controls.However,a known

  4. San Diego Littoral Cell CRSMP Potential Offshore Borrow Areas 2009

    Data.gov (United States)

    California Department of Resources — Offshore sediment sources along the entire reach of the San Diego Coastal RSM Plan region were previously identified by SANDAG and used for Regional Beach Sand...

  5. Southern Monterey Bay Littoral Cell CRSMP Proposed Receiver Site 2008

    Data.gov (United States)

    California Department of Resources — Given the location of the critical areas of erosion and the need to avoid adverse impacts to local sensitive habitat, the Southern Monterey Bay Coastal RSM Plan...

  6. Southern Monterey Bay Littoral Cell CRSMP Sensitive Habitat 2008

    Data.gov (United States)

    California Department of Resources — One of the most important functions of the southern Monterey Bay coastal system is its role as a habitat for a unique flora and fauna. The beaches are habitat for...

  7. DARLA: Data Assimilation and Remote Sensing for Littoral Applications

    Science.gov (United States)

    2017-03-01

    Numerical simulations were performed 4 using a 3D ocean circulation model (ROMS) two-way coupled to a phase-averaged wave propagation model (SWAN) in...sensing observations to constrain a data assimilation model of wave and circulation dynamics in an area characterized by a river mouth or tidal inlet...success of using remote sensing data to drive DA models, and produced a dynamically consistent representation of the wave, circulation , and

  8. Ancient maritime trade of the eastern Indian littoral

    Digital Repository Service at National Institute of Oceanography (India)

    Tripati, S.

    to foreign traders as ban- yaga, which include the Kalingas, Singhalese, Dravid- ians, etc. and merchant guild as banigrama 37 . Apart from Indian pottery, glass and semiprecious stone beads have also been discovered from Sembiran and Ban Don Ta Phet... in India and abroad. Monks, traders and sculptors played a significant role in maritime trade and carried Indian scripts and languages to South- east Asia. On their arrival at an Indian coast, the Roman and Greek mariners took advantage of prevailing...

  9. Eureka Littoral Cell CRSMP Humboldt Bay Shoreline Types 2011

    Data.gov (United States)

    California Department of Resources — In 2011 Aldaron Laird walked and kayaked the entire shoreline of Humboldt Bay mapping the shoreline conditions onto 11x17 laminated fieldmaps at a scale of 1' = 200'...

  10. San Francisco Littoral Cell CRSMP Sensitive Habitat 2012

    Data.gov (United States)

    California Department of Resources — Ecological regions of interest as identified in the San Francisco Coastal Region Sediment Management Plan.NPS identifies several special management areas within the...

  11. San Francisco Littoral Cell CRSMP Sensitive Habitat 2012

    Data.gov (United States)

    California Department of Resources — Ecological regions of interest as identified in the San Francisco Coastal Region Sediment Management Plan.NPS identifies several special management areas within the...

  12. Distribution analysis of segmented wave sea clutter in littoral environments

    CSIR Research Space (South Africa)

    Strempel, MD

    2015-10-01

    Full Text Available are then fitted against the K-distribution. It is shown that the approach can accurately describe specific sections of the wave with a reduced error between actual and estimated distributions. The improved probability density function (PDF) representation...

  13. Littoral drift sources and sinks along the Indian coast

    Digital Repository Service at National Institute of Oceanography (India)

    Chandramohan, P.; Jena, B.K.; SanilKumar, V.

    and concentration of wave energy, many coastal segments experience erosion. In order to identify the extent of the significance of the major sinks for the sediment deposition along the Indian coast, a study was undertaken to evaluate the long-term sediment...

  14. Application of remote sensing technology for studying littoral sediment dynamics

    Digital Repository Service at National Institute of Oceanography (India)

    Kunte, P.D.; Wagle, B.G.

    component image were used for area 'A' and 'B' respectively. The behaviour of sediment laden plumes was examined in detail to understand the distribution and dispersion of suspended sediments. Based on tonal and textural variation, five distinct types...

  15. San Francisco Littoral Cell CRSMP Coastal Armoring Lines 2011

    Data.gov (United States)

    California Department of Resources — This dataset is an updated version of the shapefile created by Jennifer Dare at the California Coastal Commission in 2005. The version created by Elena Vandebroek...

  16. Orange County Littoral Cell CRSMP Harbor Receiver Sites 2012

    Data.gov (United States)

    California Department of Resources — Harbor reciever sites from Everest (2009) 'Harbor Area Management Plan, In-Harbor Beach Replenishment Strategy', Technical Report. Prepared for Harbor Resources...

  17. San Diego Littoral Cell CRSMP Sensitive Habitat 2009

    Data.gov (United States)

    California Department of Resources — Specific concerns relate to the threatened snowy plover’s critical habitat, including nesting and wintering locations, as well as the endangered least tern’s...

  18. Sub-littoral meiobenthos of the northeastern Bay of Bengal

    Digital Repository Service at National Institute of Oceanography (India)

    Rodrigues, C.L.; Harkantra, S.N.; Parulekar, A.H.

    super(3)m/2 (median = 31.45 x 10 super(3)) Distribution was contagious with varied fauna in the nearshore region On the basis of metabolic index, the food requirement of the benthic community (macro+meio) in the Bay of Bengal was found to be lower than...

  19. High Resolution Marine Magnetic Survey of Shallow Water Littoral Area

    Directory of Open Access Journals (Sweden)

    Jacob Sharvit

    2007-09-01

    Full Text Available The purpose of this paper is to present a system developed for detection andaccurate mapping of ferro-metallic objects buried below the seabed in shallow waters. Thesystem comprises a precise magnetic gradiometer and navigation subsystem, both installedon a non-magnetic catamaran towed by a low-magnetic interfering boat. In addition wepresent the results of a marine survey of a near-shore area in the vicinity of Atlit, a townsituated on the Mediterranean coast of Israel, about 15 km south of Haifa. The primarypurpose of the survey was to search for a Harvard airplane that crashed into the sea in 1960.A magnetic map of the survey area (3.5 km2 on a 0.5 m grid was created revealing theanomalies at sub-meter accuracy. For each investigated target location a correspondingferro-metallic item was dug out, one of which turned to be very similar to a part of thecrashed airplane. The accuracy of location was confirmed by matching the position of theactual dug artifacts with the magnetic map within a range of ± 1 m, in a water depth of 9 m.

  20. San Diego Littoral Cell CRSMP Sensitive Habitat 2009

    Data.gov (United States)

    California Department of Resources — Specific concerns relate to the threatened snowy plover’s critical habitat, including nesting and wintering locations, as well as the endangered least tern’s nesting...

  1. Studies on littoral and sublittoral macrophytes around the Mauritius coast

    Digital Repository Service at National Institute of Oceanography (India)

    Jagtap, T.G.

    Floristic composition from the intertidal lagoon, reef, and subtidal (down to 20 m depth) regions, around the mauritius coast were studied to assess its present status. This provides firsthand information on the ecological distribution of mangroves...

  2. Seabird guano fertilizes Baltic Sea littoral food webs.

    Directory of Open Access Journals (Sweden)

    Karine Gagnon

    Full Text Available Nutrient enrichment in coastal marine systems can have profound impacts on trophic networks. In the Baltic Sea, the population of Great Cormorant (Phalacrocorax carbo sinensis has increased nearly exponentially since the mid-1990 s, and colonies of these seabirds can be important sources of nitrogen enrichment for nearby benthic communities due to guano runoff. In this study we used stable isotope analyses and diet mixing models to determine the extent of nitrogen enrichment from cormorant colonies, as well as to examine any possible changes in herbivore diet preferences due to enrichment. We found significantly higher levels of δ(15N in samples from colony islands than control islands for producers (the dominant macroalga Fucus vesiculosus, filamentous algae, and periphyton and herbivores, as well as a positive correlation between enrichment and nest density in colony sites. We also found that enrichment increased over the breeding season of the cormorants, with higher enrichment in late summer than early summer. While the amount of total nitrogen did not differ between colony and control sites, the amount of guano-based nitrogen in algae was >50% in most sites, indicating high nitrogen enrichment from colonies. Herbivores (the isopod Idotea balthica and the gastropod Theodoxus fluviatilis preferred feeding upon the dominant macroalga Fucus vesiculosus rather than on filamentous algae or periphyton in both control and colony, and there was a significant increase in periphyton consumption near colony sites. Overall, guano from cormorant colonies seems to have effects on both producers and herbivores, as well as the potential to modify algae-herbivore interactions.

  3. DARLA: Data Assimilation and Remote Sensing for Littoral Applications

    Science.gov (United States)

    2013-09-30

    WA 98105 phone: (206) 685-2609 fax: (206) 543-6785 email: jessup@apl.washington.edu Robert A. Holman Merrick Haller, Alexander Kuropov, Tuba...Ozkan-Haller Oregon State University Corvallis, OR 97331 phone: (541) 737-2914 fax: (541) 737-2064 email: holman @coas.oregonstate.edu Steve...Infrared Remote Sensing and Lidar– UW: Chickadel and Jessup B. Electro-Optical Remote Sensing – OSU: Holman C. Microwave Remote Sensing – UW

  4. Hydrodynamic Agents in the Littoral Environment. Phase 1 Progress Report

    Science.gov (United States)

    2007-07-06

    the Virginia Coast Reserve, which is near the mouth of the Chesapeake Bay. Mangrove trees are generally found on coastlines between 25...very high salinity and very anoxic conditions. White mangrove trees have an affinity for lower salinity areas. All species need gentle wave/tidal...features (morphology) for the study sites. This effort focuses on the sediment dynamics ring of the morphodynamical corridor. NGA is responsible

  5. Eureka Littoral Cell CRSMP Humboldt Bay Shoreline Types 2011

    Data.gov (United States)

    California Department of Resources — In 2011 Aldaron Laird walked and kayaked the entire shoreline of Humboldt Bay mapping the shoreline conditions onto 11x17 laminated fieldmaps at a scale of 1' = 200'...

  6. Littoral Sediment Budget for the Mississippi Sound Barrier Islands

    Science.gov (United States)

    2012-07-01

    island system originally extended west to the Mississippi mainland shoreline near the Pearl River, marking the seaward limit of subaerial deposition... Pearl Rivers discharge fresh water into the sound at average rates of about 417 and 362 m3/s, respectively (Kjerfve, 1986). However, during floods...1966, the controlling depth was 39.0 feet. 704,210 ARCE, 1967; p. 490 March 26 to April 26, 1968 Contractor’s pipeline dredge Fritz Jahncke

  7. The diets of littoral fish from the Cape Peninsula

    African Journals Online (AJOL)

    in the digestive tract was usually in an advanced stage of diges- tion and its inclusion in ...... tion of the algal cells during passage through the gut. (18) Caffrogobius ..... Food specializations and bioenergetic inter-relations in the fish faunas of ...

  8. Validation of atmospheric propagation models in littoral waters

    NARCIS (Netherlands)

    Jong, A.N. de; Schwering, P.B.W.; Eijk, A.M.J. van; Gunter, W.H.

    2013-01-01

    Various atmospheric propagation effects are limiting the long range performance of electro-optical imaging systems. These effects include absorption and scattering by molecules and aerosols, refraction due to vertical temperature gradients and scintillation and blurring due to turbulence. In maritim

  9. Investigation of Shallow Undex in Littoral Ocean Domain

    Science.gov (United States)

    2014-06-01

    bubble reaches its maximum radius, the internal gas pressure decreases dramatically, while the expanding motion continues due to the inertia of water...discussed, the term breaking pressure must be defined. The breaking pressure is the magnitude of the rarefaction wave (or relief wave, as commonly...the relief wave at this point, the vertical component of the instantaneous water particle velocity is the vector sum of the vertical 91 components

  10. Santa Barbara Littoral Cell CRSMP Sensitive Habitat Areas 2009

    Data.gov (United States)

    California Department of Resources — Ecological areas as identified and collected by BEACON and submitted to CSMW as part of the Central Coast (from Pt. Conception to Pt. Mugu) Coastal Regional Sediment...

  11. Santa Barbara Littoral Cell CRSMP Sensitive Habitat Sites 2009

    Data.gov (United States)

    California Department of Resources — Ecological areas as identified and collected by BEACON and submitted to CSMW as part of the Central Coast (from Pt. Conception to Pt. Mugu) Coastal Regional Sediment...

  12. Santa Barbara Littoral Cell CRSMP Offshore Sand Sources 2009

    Data.gov (United States)

    California Department of Resources — Offshore sand sources exist at four known locations and potentially other yet to be explored regions within the nearshore coastal shelf. Significant reserves of fine...

  13. Ecological state of the Romanian Black Sea littoral lacustrine ecosystems

    Science.gov (United States)

    Gomoiu, M.-T.

    2009-04-01

    The author uses the results of his own researches as well as data from specialty literature to assess the ecological state of some typical lacustrine ecosystems considered, about 50 years ago, of major importance by their functions, services and researches, for the human populations in the settlements nearby. Based on this assessment the author recommends a few criteria which can be taken into account when programs of integrated management of these coastal ecosystems are initiated. The paper focuses on the study cases regarding the following major ecosystems: 1. Razelm-Sinoie Lagoon Complex - tightly linked to the Danube River and Delta systems, 2. Taşaul Lake - interfered in the last two decades by a branch of the DanubeRiver - Black Sea Canal and 3. Techirghiol Lake - for a long time under the sea level, a hyperhaline lake with therapeutic, sapropelic mud, disturbed by huge quantities of freshwaters infiltrated from the irrigation system. At present, the state of the lacustrine ecosystems at the Romanian Black Sea Coast can be characterized, mainly, by the following aspects: · Increase in the quantities of nutrients and chemical toxicants; · Rise in the level and frequency of eutrophication and pollution phenomena; · Drastic reduction of specific diversity; · Simplification of communities' structure - biocoenosis homogeneity; · Decrease in numerical abundance and biomass of benthic populations and consequently, low biofilter power by the decrease of the filter-feeder populations; · Worsening of the qualitative and the quantitative state of the biological benthic resources; · Thriving opportunistic forms (e.g. the worms causing sediment bioturbation); · Invasion by some exotic species, with harmful, unexpected consequences; · All populations undergo quantitative fluctuations; · Decrease in the fish population and in the use values of lacustrine assets, with strong impact on the welfare of the human society. Almost all pressure forms associated with the relationship between the socio-economic systems and the other components of the hierarchy of ecological systems also existed, without exception, in the Romanian coastal part of the Black Sea causing manifest ecological effects on various types of para-marine lacustrine ecosystems. Generally, we consider that the following set of effects is typical of the ecological impact resulted from the dynamics of the socio-economic systems at different time and space scales: · Erosion of diversity as a result of the loss of species or reduction in the species abundance in the local ecosystems and complex of ecosystems or because of the habitat fragmentation, isolation of valuable natural systems, to which other causes may be added such as desertification and salinization or water freshening; · Erosion of biological diversity caused by: extinction of higher species and taxa, loss of genetic resources, increase in the number of rare species threatened with extinction and significant reduction in the ethno-cultural diversity; · Depletion or reduction in the stocks of renewable and non-renewable natural resources; · Changes in the biogeochemical cycles and in the climatic system, caused by the overloading of the surface waters and soils with nutrients, heavy metals, radio-nuclides, greenhouse gases, particulate or dissolved organic matter and by deterioration of other factors. These changes cause, in their turn, a series of processes similar to chain reactions, which lead to an increasing risk of natural disasters; · Decrease in the productive and supportive capacity of components which form the foundation of the socio-economic system in the reference zone. · An alarming increase in the „environmental debt" which endangers the chances of short-term and, especially, long-term development. The author recommends some solutions in solving the conflict of interest, which consist in a set of measures and actions, as follows: · identifying synergies or contradictions between actions resulting from various policies; · improving coordination, cooperation and consultation between all concerned as the basis for sustainable development; · applying locally the principles of subsidiarity and integration, which underlie European environment and regional planning activities; · approaching the concept of "ecosystem management", that is 1. input from all levels; 2. decentralized, with feedbacks; 3. risk-taking; 4. willingness to revisit, revise and admit error; 5. shared vision; 6. across administrative boundary, and 7. partnerships). · Adopting demonstration projects to ensure good cooperation between the various planning authorities, from local to community level.

  14. Operational Deception in the Littorals: Necessary and Achievable

    Science.gov (United States)

    2012-05-04

    romantic view of operational deception. In preparation for Operation HUSKY, the landing on Sicily in World War II, Allied planners dropped a...adopted, existing methods are adapted, and new doctrine and training opportunities are developed. Advances in technology present new and novel ways to

  15. US Navy’s Engagement in the African Littoral Environment

    Science.gov (United States)

    2013-06-14

    Ronald O’Rourke, R. Chuck Mason, Rawle O. King. Piracy off the Horn of Africa. Washington, DC: Congressional Research Service, April 2009. http......Gudmundsson, William S. Lind, Douglas Macgregor, Chet Richards, Col. John Sayen, Pierre Sprey, James P. Stevenson, Donald E. Vandergriff, G.I

  16. Southern Monterey Bay Littoral Cell CRSMP Potential Sediment Sources 2008

    Data.gov (United States)

    California Department of Resources — Three main criteria are used as an initial basis for screening source locations; availability of large quantities of beach compatible sand, levels of contamination,...

  17. San Diego Littoral Cell CRSMP Upland Sand Source Sites 2009

    Data.gov (United States)

    California Department of Resources — Sediment sources of interest to this Coastal RSM Plan exist seaward of the coastal watershed drainage divide. These sources generally are more plentiful downstream...

  18. Littoral zone fish assemblages of northern Cayuga Lake.

    Science.gov (United States)

    McKenna, James E.

    2001-01-01

    Fish assemblages from northern Cayuga Lake were examined for patterns in temporal structure. Fish assemblages changed significantly between seasons. Bluegill (Lepomis macrochirus), bluntnose minnow (Pimephales notatus), and smallmouth bass (Micropterus dolomieu) formed the basis for most assemblages, but the spring assemblage was dominated by common carp (Cyprinus carpio). Correlations between community structure and abiotic factors were identified. Ten abiotic factors strongly influenced species assemblages, including phosphorus concentration, but could not fully explain differences between assemblages. Results indicate that the seasonal pattern of fish assemblage structure and abundance of fish that tend to feed in the water column were related to the annual cycle of productivity in the lake and behavioral adaptations of the fish.

  19. Life in the littoral zone: lactobacilli losing the plot.

    Science.gov (United States)

    Hay, P

    2005-04-01

    Recurrent bacterial vaginosis is a challenge for those affected by it, and their physicians. Our inability to prevent relapse after treatment, may be because of the flawed approach of using antibiotics to treat a condition that is an imbalance rather than an infection. The maintenance of a healthy lactobacillus population offers an approach to preventing relapse: the problem is how best to do this. Physiological approaches such as the use of hydrogen peroxide, lactic acid, and exogenous lactobacilli need to be explored further. The role of bacterial vaginosis as a risk factor for acquisition of HIV and other STIs is a further impetus to attempting to prevent bacterial vaginosis from recurring.

  20. Ecological study on littoral and infralittoral isopods from Ubatuba, Brazil

    Directory of Open Access Journals (Sweden)

    Ana Maria Setubal Pires

    1981-06-01

    Full Text Available The isopod species of rocky shores and shallow infralittoral zone from Enseada do Flamengo, Ubatuba, were studied. The sampling was done during Autumn (1965 and during Autumn and Springtime (1975 at six stations classified according to wave exposure. The intensity of the waves and the type of substratum showed to be important factors influencing distribution, abundance and diversity of the fauna. The highest density of isopods occurred in Dictyota ciliolata. A relation between species diversity and the degree of wave action was disclosed. Species diversity rised from exposed to moderately exposed sites and decreased with the increase in shelter.No presente trabalho, foram estudados os padrões de distribuição vertical e horizontal da fauna de Isopoda de costões rochosos, bem como sua abundância relativa nos vários substratos investigados, visando ao conhecimento de alguns aspectos de sua ecologia. As coletas foram realizadas nas zonas litoral e infralitoral da Enseada do Flamengo, Ubatuba, Estado de São Paulo, Brasil. As estações de coleta variaram quanto ao grau de exposição às ondas e profundidade. As amostras do litoral foram coletadas em abril e setembro de 1975 e janeiro de 1976, enquanto que as do infralitoral referem-se a abril e maio de 1965. Verificou-se que a exposição às ondas é um fator muito importante na distribuição das espécies, havendo animais que só foram encontrados nas condições ecológicas oferecidas por locais expostos e semi-expostos, e outros que só o foram em locais abrigados. Entretanto, existem espécies que ocorreram nas três situações, sendo geralmente mais abundantes em uma delas em particular. O tipo de substrato mostrou ser outro fator que exerce grande influência na distribuição das espécies. Substratos diferentes, coletados em um mesmo local e submetidos às mesmas condições ambientais, apresentaram variação na composição e abundância relativa da fauna de Isopoda. Esta variação é dependente da estrutura do substrato, da proteção e da quantidade de nichos que ele oferece às espécies. A maior densidade de isópodes foi obtida em Dictyota ciliolata, na franja do infralitoral. Foi encontrada uma relação entre diversidade de espécies e grau de exposição às ondas. A diversidade de espécies aumenta dos lugares expostos para os semi-expostos e decresce muito destes para os abrigados. O presente estudo revelou, também, a existência de uma variação estacional na abundância relativa e na diversidade das espécies, sendo ambas mais elevadas em setembro.

  1. Southern Monterey Bay Littoral Cell CRSMP Proposed Receiver Site 2008

    Data.gov (United States)

    California Department of Resources — Given the location of the critical areas of erosion and the need to avoid adverse impacts to local sensitive habitat, the Southern Monterey Bay Coastal RSM Plan...

  2. San Diego Littoral Cell CRSMP Upland Sand Source Sites 2009

    Data.gov (United States)

    California Department of Resources — Sediment sources of interest to this Coastal RSM Plan exist seaward of the coastal watershed drainage divide. These sources generally are more plentiful downstream...

  3. Southern Monterey Bay Littoral Cell CRSMP Critical Erosion Sites 2008

    Data.gov (United States)

    California Department of Resources — PWA and Griggs (2004) defined three risk categories to Monterey Regional Water Pollution Control Agency (MRWPCA) facilities between Marina and Wharf II. These risk...

  4. Littoral Combat Ship: Is it a Blue-Green Asset?

    Science.gov (United States)

    2010-04-02

    I I DISCLAIMER - -~- ·-· · · ·· THEOPINIONSANDCONCbUSIONS-~ XPRESSED HEREIN-ARE THOSE-OF-THE· INDIVIDUAL STUDENT AUTHOR AND DO NOT NECESSARILY...States world image. Globalization and technological advancements have put MOOTW operations under immediate scrutiny. LCS has the potential to improve U.S

  5. Assisting ONR Littoral Air-Sea Processes DRI

    Science.gov (United States)

    2012-09-30

    observations. This event has been selected as the additional case study for existing MJO model intercomparison project (see e). Report...activities during TWP-ICE, including cloud resolving models (CRMs) and global climate models (GCMs). This PI had conversations with the leaders of these...are working on global, regional , and local CPMs. By the end, we will have a two tier model comparison projects targeting the DYNAMO field periods

  6. Measurement of atmospheric MTF in a littoral environment

    CSIR Research Space (South Africa)

    Griffith, DJ

    2008-09-01

    Full Text Available the sea surface were mounted at the shoreline looking at two point sources mounted at heights of 6 m and 13 m above the sea surface on the lighthouse. The telescopes were equipped with digital charge-coupled device (CCD) cameras and the system MTF...

  7. Seabird Guano Fertilizes Baltic Sea Littoral Food Webs

    Science.gov (United States)

    Gagnon, Karine; Rothäusler, Eva; Syrjänen, Anneli; Yli-Renko, Maria; Jormalainen, Veijo

    2013-01-01

    Nutrient enrichment in coastal marine systems can have profound impacts on trophic networks. In the Baltic Sea, the population of Great Cormorant (Phalacrocorax carbo sinensis) has increased nearly exponentially since the mid-1990s, and colonies of these seabirds can be important sources of nitrogen enrichment for nearby benthic communities due to guano runoff. In this study we used stable isotope analyses and diet mixing models to determine the extent of nitrogen enrichment from cormorant colonies, as well as to examine any possible changes in herbivore diet preferences due to enrichment. We found significantly higher levels of δ15N in samples from colony islands than control islands for producers (the dominant macroalga Fucus vesiculosus, filamentous algae, and periphyton) and herbivores, as well as a positive correlation between enrichment and nest density in colony sites. We also found that enrichment increased over the breeding season of the cormorants, with higher enrichment in late summer than early summer. While the amount of total nitrogen did not differ between colony and control sites, the amount of guano-based nitrogen in algae was >50% in most sites, indicating high nitrogen enrichment from colonies. Herbivores (the isopod Idotea balthica and the gastropod Theodoxus fluviatilis) preferred feeding upon the dominant macroalga Fucus vesiculosus rather than on filamentous algae or periphyton in both control and colony, and there was a significant increase in periphyton consumption near colony sites. Overall, guano from cormorant colonies seems to have effects on both producers and herbivores, as well as the potential to modify algae-herbivore interactions. PMID:23593452

  8. The Littoral Combat Ship: How We Got Here, and Why

    Science.gov (United States)

    2014-01-01

    approximately $529 million, or $165,003/ton. And an Oliver Hazard Perry-class FFG, a 3,150-ton ship with greater survivability standards and equipped with a...thirty long-hulled Oliver Hazard Perry-class FFGs, fourteen Avenger-class MCMs, twelve Osprey-class MHCs, and thirteen Cyclone-class PCs would gradually...nothing 43 could be further from the truth. After a decade of twists and turns, the Navy is getting very nearly exactly the ship it asked for: an

  9. San Diego Littoral Cell CRSMP Receiver Sites 2009

    Data.gov (United States)

    California Department of Resources — A total of 27 possible placement sites (some with multiple placement footprints) are incorporated into this San Diego Coastal Regional Sediment Management Plan to...

  10. Santa Barbara Littoral Cell CRSMP Offshore Sand Sources 2009

    Data.gov (United States)

    California Department of Resources — Offshore sand sources exist at four known locations and potentially other yet to be explored regions within the nearshore coastal shelf. Significant reserves of fine...

  11. Prediction of littoral drift with artificial neural networks

    Directory of Open Access Journals (Sweden)

    A. K. Singh

    2007-07-01

    Full Text Available The amount of sand moving parallel to a coastline forms a prerequisite for many harbour design projects. Such information is currently obtained through various empirical formulae. Despite much research in the past an accurate and reliable estimation of the rate of sand drift has still remained as a problem. The current study addresses this issue through the use of artificial neural networks (ANN. Feed forward networks were developed to predict the sand drift from a variety of causative variables. The best network was selected after trying out many alternatives. In order to improve the accuracy further its outcome was used to develop another network. Such simple two-stage training yielded most satisfactory results. An equation combining the network and a non-linear regression is presented for quick field usage. An attempt was made to see how both ANN and statistical regression differ in processing the input information. The network was validated by confirming its consistency with the underlying physical process.

  12. Prediction of littoral drift with artificial neural networks

    Directory of Open Access Journals (Sweden)

    A. K. Singh

    2008-02-01

    Full Text Available The amount of sand moving parallel to a coastline forms a prerequisite for many harbor design projects. Such information is currently obtained through various empirical formulae. Despite so many works in the past an accurate and reliable estimation of the rate of sand drift has still remained as a problem. The current study addresses this issue through the use of artificial neural networks (ANN. Feed forward networks were developed to predict the sand drift from a variety of causative variables. The best network was selected after trying out many alternatives. In order to improve the accuracy further its outcome was used to develop another network. Such simple two-stage training yielded most satisfactory results. An equation combining the network and a non-linear regression is presented for quick field usage. An attempt was made to see how both ANN and statistical regression differ in processing the input information. The network was validated by confirming its consistency with underlying physical process.

  13. The Littoral Environment Observation (LEO) Data Collection Program.

    Science.gov (United States)

    1981-03-01

    for analysis . Identification tags with the recorded beach name, site number, date, and time of sampling are affixed to the sandbags. /.71 Figure 20...3 4aao~cc 0 a m 4’’-c~cc o-..~irl m a c o - 0 r-.0r 0 0~io.. -4 c ci0 m1 -0 cicZ. 0 1 0 mccg -.a 5 . a 00 VOc 0 0cE. 0 Oc 0 ci0~ ~~~~ ~ 0 vN. -c I

  14. Southern Monterey Bay Littoral Cell CRSMP Potential Sediment Sources 2008

    Data.gov (United States)

    California Department of Resources — Three main criteria are used as an initial basis for screening source locations; availability of large quantities of beach compatible sand, levels of contamination,...

  15. Prediction of littoral drift with artificial neural networks

    Digital Repository Service at National Institute of Oceanography (India)

    Singh, A.K.; Deo, M.C.; SanilKumar, V.

    of the rate of sand drift has still remained as a problem. The current study addresses this issue through the use of artificial neural networks (ANN). Feed forward networks were developed to predict the sand drift from a variety of causative variables...

  16. San Francisco Littoral Cell CRSMP Coastal Armoring Areas 2011

    Data.gov (United States)

    California Department of Resources — This dataset is an updated version of the shapefile created by Jennifer Dare at the California Coastal Commission in 2005. The version created by Elena Vandebroek...

  17. San Francisco Littoral Cell CRSMP Coastal Armoring Lines 2011

    Data.gov (United States)

    California Department of Resources — This dataset is an updated version of the shapefile created by Jennifer Dare at the California Coastal Commission in 2005. The version created by Elena Vandebroek...

  18. Community structure characters of benthic algae community on littoral zone of the lakes in the middle reaches of Yangtze River%长江中游湖泊沿岸带的底栖藻类群落结构特征

    Institute of Scientific and Technical Information of China (English)

    裴国凤; 刘国祥

    2011-01-01

    测定和分析湖北省21个浅水湖泊沿岸带底柄藻类的现存量,底柄硅藻的种类组成、细胞密度、多样性指数及其群落结构特征,并结合理化指标对水质状况进行评价.结果表明:调查期间,不同湖泊底柄藻类的现存量和底柄硅藻细胞密度分别介于1.01-40.82μg/cm2和0.09×106-14.20×106cells/cm2之间,它们在所研究的富营养化湖泊中的含量均相对较高.在发现的181种(变种)底柄硅藻中,极细微曲壳藻分布广泛,是中营养、中-富营养湖泊的绝对优势种或主要优势种之一.TWINSPAN和DCA分析结果显示这些湖泊样点被分成3组,第一组中一富营养型湖泊的主要优势种是曲壳藻属的一些种类;第二组中营养湖泊同时存在分布相对均匀的多个优势种;第三组主要是城区富营养湖泊.南湖处于超富营养水平,小形异极藻占绝对优势(相对丰富度为43%).%Species composition, cell density, Shannon-Weaver diversity index, community structures of benthic diatoms and standing crops of benthic algae were investigated in the littoral zone of 21 shallow lakes in Hubei Province, and the water quality was evaluated combined with chemical parameters. The standing crops( Chl. a) of benthic algae and the density of benthic diatoms, with the range of 1.01 -40. 82μg/cm2 and 0.09 × 106 - 14.20 × 106 cells/cm2, respectively, exhibited higher values in eutrophic lakes during the studying period. Among the 181 taxa (variety) of benthic diatom observed, Achnanthes minutissima distributed widely and was absolutely dominant or sub-dominant species in mesotrophic and meso-eutrophic lakes. The results of two-way indicator species analysis and detrended correspondence analysis catalogued these lakes into three groups: the dominant species were taxa of Achnanthes genus in meso-eutrophic lakes of the first group; several dominant species existed at the same time in mesotrophic lake of the second group; the third group were the

  19. 浙江沿海一家系脊髓小脑性共济失调的基因突变检测与临床表现%Clinical features and gene mutation analysis in Machado-Joseph disease of spinocerebellar ataxia type 3 in littoral of Zhejiang

    Institute of Scientific and Technical Information of China (English)

    金友雨; 曾爱平; 蔡海波; 吴锋; 冯忠; 洪庆; 章立; 江志开

    2009-01-01

    Objective To study the clinical features and gene mutation analysis in Machado-Joseph disease of spinocerebellar ataxia type 3 in littoral of Zhejiang. Methods Clinical manifestation and brain MRI data 18 patients with SCA in family were analyged. The gene mutations of 18 patients and 10 family numbers without abnormal presentation,and 12 healthy persons of controls. Results The gene mutations of 18 patients is SCA3/ MJD,and 2 asymptomatic SCA3/MJD had been detected in SCA family. Normal alleles of SCA3/MJD have CAG repeats ranging from 14 to 27, patients from 67 to 82, asymptomatic and carrier SCA3/MJD from 28 to 45. The main features of 18 patients included gait ataxia, ambiguity in speech and action clumsiness. Brain MRI showed remarkable atrophy on cerebellum and brain stem. Conclusion CAG expansions were related to SCA3/MJD.The clinical manifestations are ataxia and dysarthria. The detection of repeated times CAG can provide an effective way for the genetic and asymptomatic diagnosis.%目的 探讨浙江沿海脊髓小脑性共济失调的基因突变检测与临床表现.方法 对该家系18例患者的临床表现、头颅MRI等辅助检查资料分析,并与10名家系中未发病成员及12名非血缘的健康人进行SCA31MJD基因CAG三核苷酸重复数目比较.结果 家系18例患者均为SCA3/MJD型,同时检测出家系中未发病对照组有2例为SCA31MJD型基因携带者.产物测序结果家系对照组与健康对照组CAG重复数为14~27次;SCA患者CAG重复数为67~82次;SCA3/MJD携带者CAG重复数为28~45次.在现存三代18例患者中,每代均有患者,男女均受累,起病年龄平均38岁,以行走不稳、动作笨拙和言语含糊为突出表现,MRI检测结果小脑、脑干明显萎缩.结论 在我国沿海存在SCA3/MJD家系遗传.临床均以共济失调和构音障碍为突出,CAG重复数目检测可为基因诊断和症状前诊断提供依据.

  20. Distribución y abundancia de la comunidad de peces en la porción litoral de la Reserva de la Biósfera Los Petenes, Campeche, México Distribution and abundance of fish community in the littoral area of "Los Petenes" Biosphere Reserve, Campeche, Mexico

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    Sandra Muñoz-Rojas

    2013-03-01

    describe the ichthyofauna diversity in the littoral coastal area of the RBLP, to identify the ecological dominant species, and to analyze the abundance of the fish community and its temporal and spatial changes, and their relationship with some environmental variables. Monthly fish samples were obtained with the aid of trawl nets, from 24 samplings sites distributed along the reserve, between May 2009 and April 2010. The trawl net was operated 288 times and 21 795 individuals with 279.5kg of weight were collected. A total of 46 fish species grouped in 34 genera and 23 families were identified. In a spatial scale, the abundance showed the next ranges: 0.018-0.094ind./m²; 0.249-1.072 g/m² and 9.75-19.32g/ind.; the diversity indexes obtained were: Hn=1.46-2.15, J=0.45-0.71 and D=2.08-3.92. In a temporal scale, the abundance and diversity ranged between: 0.026-0.066ind./m2; 0.342-0.764g/m² and 6.49-22.98g/ind.; Hn=1.76-2.08; J’=0.52-0.64 and D=3.07-4.18. Eleven dominant species were identified with a representation of the 94.39% in number of individuals, and 89.66% in weight of the total catch. From the total, eight species had economic or commercial importance, especially Lagodon rhomboides and Haemulon plumierii. The cluster analyses identified four fish associations; these results are discussed in order to identify relationships between habitat-species. Finally, the canonical correspondence analysis evidenced an association between H. plumierii with salinity and dissolved solids. The RBLP has high habitat diversity and its fish community has developed strategies to use all the spatial and temporal conditions and to satisfy the needs of their life cycles.

  1. The spelling of the name Sarothrogammarus (Crustacea, Amphipoda)

    NARCIS (Netherlands)

    Stock, Jan H.

    1972-01-01

    In my recent revision of the Sarothrogammarus-group (Bijdr. Dierk., 41: 94—129, 1971), I consistently used the spelling Sarathrogammarus. Professor S. Ruffo, of Verona, kindly pointed out to me that the original spelling of the name is Sarothrogammarus (see Martynov, 1935, Trav. Inst. zool. Acad. Se

  2. Cryptic species in putative ancient asexual darwinulids (Crustacea, Ostracoda.

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    Isa Schön

    Full Text Available BACKGROUND: Fully asexually reproducing taxa lack outcrossing. Hence, the classic Biological Species Concept cannot be applied. METHODOLOGY/PRINCIPAL FINDINGS: We used DNA sequences from the mitochondrial COI gene and the nuclear ITS2 region to check species boundaries according to the evolutionary genetic (EG species concept in five morphospecies in the putative ancient asexual ostracod genera, Penthesilenula and Darwinula, from different continents. We applied two methods for detecting cryptic species, namely the K/θ method and the General Mixed Yule Coalescent model (GMYC. We could confirm the existence of species in all five darwinulid morphospecies and additional cryptic diversity in three morphospecies, namely in Penthesilenula brasiliensis, Darwinula stevensoni and in P. aotearoa. The number of cryptic species within one morphospecies varied between seven (P. brasiliensis, five to six (D. stevensoni and two (P. aotearoa, respectively, depending on the method used. Cryptic species mainly followed continental distributions. We also found evidence for coexistence at the local scale for Brazilian cryptic species of P. brasiliensis and P. aotearoa. Our ITS2 data confirmed that species exist in darwinulids but detected far less EG species, namely two to three cryptic species in P. brasiliensis and no cryptic species at all in the other darwinulid morphospecies. CONCLUSIONS/SIGNIFICANCE: Our results clearly demonstrate that both species and cryptic diversity can be recognized in putative ancient asexual ostracods using the EG species concept, and that COI data are more suitable than ITS2 for this purpose. The discovery of up to eight cryptic species within a single morphospecies will significantly increase estimates of biodiversity in this asexual ostracod group. Which factors, other than long-term geographic isolation, are important for speciation processes in these ancient asexuals remains to be investigated.

  3. [Euphausiids (Crustacea: Melacostraca) from the southern Mexican Caribbean Sea].

    Science.gov (United States)

    Castellanos, Iván; Gasca, Rebeca

    2002-03-01

    The composition, abundance and distribution of euphausiids from the southern part of the Mexican Caribbean Sea (August 1986) were sampled during the ARCOMM I cruise on board the R/V "Justo Sierra" of UNAM. Sampling was done using a Bongo-net (0.5 mm mesh size) performing oblique hauls from 200 m to the surface at 28 stations. Of the total euphausiid numbers, the most abundant species was Stylocheiron carinatum (49%), followed by Euphausia americana (9.8%) and E. tenera with (7.8%). The highest total density and that of the three most abundant species occurred during the night sampling, and probably was related to vertical migration patterns. The Bray-Curtis index revealed three station assemblages, related to the day-night variations of the euphausiid community. Species were distributed mainly in the oceanic area, and were absent in the neritic zones. The local fauna shows a strong affinity for the euphausiid community of the Gulf of Mexico and other areas of the Caribbean Sea. Four species are considered to be new records for the western Caribbean Sea.

  4. Use of neomysis mercedis (crustacea: mysidacea) for estuarine toxicity tests

    Energy Technology Data Exchange (ETDEWEB)

    Brandt, O.M.; Fujimura, R.W.; Finlayson, B.J. (Aquatic Toxicology Laboratory, Elk Grove, CA (United States))

    1993-03-01

    The mysid Neomysis mercedis was examined as a test organism for use in acute toxicity tests at intermediate salinities characteristic of estuarine waters. Several sensitive invertebrate species are available for marine assessments (mysids) and freshwater tests (cladocerans), but few are available for estuarine toxicity tests. Observations in the laboratory indicate that Neomysis mercedis can be reared successfully at a temperature of 17[degrees]C, a salinity of 2%, and a population density less than 5/L. Brine shrimp nauplii Artemia salina, algae, and commercial foods were used to sustain mysid cultures. Neomysis mercedis is vivaparous and can complete its life cycle in 3-4 months. Neomysis mercedis is as sensitive as or more sensitive to toxicants than the marine mysid Mysidopsis bahia and the freshwater cladocerans Daphnia magna, Ceriodaphnia dubia, and Simocephalus serrulatus. The mean 96-h LC50 values (concentrations lethal to half the test animals) for N. mercedis, in increasing order, were 0.20 [mu]g/L for thiobencarb, and for malathion, 14 [mu]g/L for carbofuran, 150 [mu]g/L for copper sulfate, 280 [mu]g/L for thiobencarb, and 1,600 [mu]g/L for molinate. Neonates (5 d postrelease) were generally more sensitive than older juveniles. Coefficients of variation (100[center dot]SD/mean) of LC50 values varied from 21 to 35%. 37 refs., 2 figs., 7 tabs.

  5. The spelling of the name Sarothrogammarus (Crustacea, Amphipoda)

    NARCIS (Netherlands)

    Stock, Jan H.

    1972-01-01

    In my recent revision of the Sarothrogammarus-group (Bijdr. Dierk., 41: 94—129, 1971), I consistently used the spelling Sarathrogammarus. Professor S. Ruffo, of Verona, kindly pointed out to me that the original spelling of the name is Sarothrogammarus (see Martynov, 1935, Trav. Inst. zool. Acad.

  6. Reproductive cycle of Macrobrachium amazonicum females (Crustacea, Palaemonidae

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    CMS. Sampaio

    Full Text Available Macrobrachium amazonicum is considered a favorite Brazilian species of freshwater prawn for cultivation as a result of its quick development and because it is easy to maintain in captivity. The aim of this work is to describe the sexual cycle stages and determine maturation age of the female M. amazonicum, which was collected monthly from June, 2002 to May, 2003 in the Jaguaribe River, Itaiçaba, Ceará. A monthly sample of water was also collected to determine the following parameters: temperature, dissolved oxygen, pH and salinity. A monthly sample of females was selected among the individuals caught, to determine the total weight (W T, carapace length (L C and abdomen+telson length (L A+T and to register the number of non-ovigerous females (NOF and ovigerous females (OF. Determining ovarian maturation stages of M. amazonicum was done in a laboratory by observing macroscopic characters such as coloring, size, location and appearance of ovarians examined by transparent carapace. The first maturation age was determined from the relative frequency of the total length (L T of young and adult females. The environmental parameters of the Jaguaribe River did not hold any influence in the number of individuals collected. A total of 1,337 prawns were sampled, 513 males (38.4% and 824 females (61.6%. The proportion between males and females in the studied population was of 1:1.6. Among the collected females, 492 (50.7% did not carry eggs in their abdomens (NOF and 332 (40.3% carried eggs in their abdomens (OF. There was no record of intact females. Non-ovigerous females with mature ovaries were recorded throughout all the months of collection. The female ovaries were classified as immature (IM, rudimentary (RU, intermediary (IN and mature (M. M. amazonicum females reach their first sexual maturity between 4.5 and 5.5 cm of total length.

  7. Life cycle of Cyclestheria hislopi (Baird, 1859) (Crustacea, Branchiopoda).

    Science.gov (United States)

    Yashima, M N; Baldochi, A; Rocha, O

    2011-05-01

    The Conchostraca (clam shrimps) are a group of microcrustaceans found in freshwater habitats. They inhabit the benthos, yet many can swim actively and are often associated with macrophytes. They are filter-feeders, deriving their food from suspended particles or solids stirred up from the bottom. In Brazil, five species have been recorded and the life cycle of one of these, Cyclestheria hislopi (Baird, 1859) was investigated in this study. Specimens were collected from fish-farming tanks in upstate São Paulo and from the floodplain of the Miranda River, in the Mato Grosso swamplands of center-west, Brazil. We determined the following variables: post-embryonic development, duration of life cycle (longevity), mean period between broods, duration of instars and individual growth. Taxonomic features of the Cyclestheria sp. specimens from Mato Grosso were also assessed to check the possibility that they belonged to another species of the same genus or a separate ecotype of C. hislopi.

  8. The first hypothelminorheic Crustacea (Amphipoda, Dogielinotidae, Hyalella from South America

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    Stella Rodrigues

    2012-11-01

    Full Text Available Most of known troglobiotic species occur in caves and subterranean environments from great depths. However, recently more attention has been given to other subterranean environments, such as the hypothelminorheic habitats. It comprises the most superficial among all subterranean habitats. This kind of environment is characterized by the constant presence of wet spots, absence of light and very particular abiotic characteristics, comprising unique species. The first hypothelminorheic Amphipoda from South America is here described, a new species of the genus Hyalella which occurs in a wetland on Southern Brazil. The new species differs from other troglobiotics of the genus by the presence of a curved seta on the inner ramus of uropod 1 and elongation of appendices, as the first pair of antennae and peraeopods 6 and 7. However, human impacts in the area where the new species occurs have changed heavily their habitat, which may have led the species to a critical level of threat or even extinction, demonstrating the fragility of this environment.a

  9. Genetic divergence of tanaidaceans (Crustacea: Peracarida with low dispersal ability

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    Kim Larsen

    2014-03-01

    Full Text Available In this study, the phylogeographic patterns of nuclear, ribosomal and mtDNA gene fragments of five tanaidacean species (Zeuxo, Tanaidae from the Atlantic, Pacific and Mediterranean Sea were investigated. We aimed to interpret results in the framework of current hypotheses on the distribution of small invertebrates with very limited dispersal ability. Evidence for a surprisingly high genetic divergence was found for intertidal tanaidaceans from the North Atlantic. This is a result of poor dispersal potential, as tanaidaceans have direct development, no pelagic stage, and very limited swimming capacity. However, lower genetic divergence was found between an intertidal tanaid species from the North Atlantic and two from the North Pacific, which suggests a scenario of recent colonization following the last glacial maximum. The species Zeuxo normani was found to be a species complex consisting, at least, of Z. normani (California, Z. cf. normani (Japan, Z. cf. normani (Australia, Z. sp. A (Korea, and Z. holdichi (Spain and France. Our results showed that traditional species identification underestimates tanaidacean diversity and that what have been previously perceived as reliable diagnostic morphological characters, are, however, variable and unreliable.

  10. Records of Australian Fouling Organisms: Sessile Barnacles (Crustacea, Cirripedia),

    Science.gov (United States)

    1981-04-01

    1976-April 1978. Report 731, Materials Research Labs., Melbourne. Endean, R., Kenny, R. & Stephenson, W. (1956), The ecology and distribution of...The ecology and distribution of intertidal organisms on certain islands off the Queensland coast. Aust. J. mar. Freshwat. Res. 7, 317-42. Ferguson...USA (Attention: Dr. J.R. De Palma ) Naval Oceans Systems Center, Hawaii Laboratory (Attention: Dr. J.C. Grovhoug) Dr. B.A. Foster, University of Auckland, NZ Dr. A.R. Ross, San Diego Natural History Museum, San Diego, USA

  11. Stomatopods (Crustacea: Hoplocarida from the Gulf of Tehuantepec, Mexico

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    I. F. Barbosa-Ledesma

    2000-06-01

    Full Text Available A total of 1173 specimens of Stomatopoda were captured in 27 localities at different depths (20 to 73 m during three oceanographic cruises in the Mexican Pacific along the continental shelf of the states of Oaxaca and Chiapas. Seven species were identified of the families Eurysquillidae, Lysiosquillidae and Squillidae. Squilla hancocki and Squilla parva were the most abundant species and the most frequently found together. The relationships between total length and carapace length were obtained for these species, which show that males of S. hancocki have a longer carapace length than females having the same total length, whereas for S. parva the opposite occurs. Larger sizes than previously reported were obtained for Lysiosquilla panamica and Squilla mantoidea. Squilla bigelowi was recorded for the first time in the Gulf of Tehuantepec. All the species were found in the intermediate platform (25-60 m; E. veleronis, S. hancocki and S. parva extended their distributions to the external platform (60-120 m, and S. hancocki and S. parva reached the circalittoral zone (10-25 m.Se capturaron un total de 1173 especímenes del orden Stomatopoda en 27 localidades a diferentes profundidades (20 a 73 m durante tres cruceros oceanográficos en el Pacífico Mexicano a lo largo de la plataforma continental de los estados de Oaxaca y Chiapas. Se identificaron siete especies de las familias Eurysquillidae, Lysiosquillidae y Squillidae. Squilla hancocki y Squilla parva fueron las especies más abundantes y las más frecuentemente encontradas juntas. Se obtuvieron las relaciones entre la longitud total y la longitud del caparazón para estas dos especies; que indican que con una misma longitud total los machos de S. hancocki tienen una longitud del caparazón mayor que las hembras, mientras que para S. parva sucede lo contrario. Se registraron longitudes totales más grandes a las reportadas previamente para Lysiosquilla panamica y Squilla mantoidea. Squilla bigelowi se registró por primera vez en el área. Todas las especies se encontraron en la plataforma intermerdia (25-60 m; E. Veleronis, S. Hancocki y S. parva se distribuyeron hasta la plataforma externa (60-120 m y S. hancocki y S. parva abarcaron la zona circalitoral (10-25 m.

  12. Identification of the first neuropeptides from the Amphipoda (Arthropoda, Crustacea).

    Science.gov (United States)

    Christie, Andrew E

    2014-09-15

    Despite being used as models in the field of ecotoxicology, including use in studies of endocrine disruption, little is known about the hormonal systems of amphipods, particularly their peptidergic signaling systems. Here, transcriptome shotgun assembly (TSA) sequences were used to predict the structures of the first neuropeptides from members of this crustacean order. Using a well-established workflow, BLAST searches of the extant amphipod TSA data were conducted for putative peptide-encoding transcripts. The pre/preprohormones deduced from the identified TSA sequences were then used to predict the mature structures of amphipod neuropeptides. In total, 43 putative peptide-encoding transcripts were identified from three amphipods, Echinogammarus veneris, Hyalella azteca and Melita plumulosa. Collectively, 139 distinct mature peptides (110 from E. veneris alone) were predicted from these TSA sequences. The identified peptides included members of the adipokinetic hormone/red pigment concentrating hormone, allatostatin A, allatostatin B, allatostatin C, bursicon α, bursicon β, crustacean hyperglycemic hormone, diuretic hormone 31, FLRFamide, molt-inhibiting hormone, myosuppressin, neuroparsin, neuropeptide F, orcokinin, pigment dispersing hormone (PDH), proctolin, RYamide, SIFamide, sulfakinin and tachykinin-related peptide families. Of particular note were the identifications of orcokinins possessing SFDEIDR- rather than the typical NFDEIDR- amino-termini, e.g. SFDEINRSNFGFN, a carboxyl-terminally amidated orcokinin, i.e. SFDEINRSNFGFSamide, PDHs longer than the stereotypical 18 amino acids, e.g. NSELLNTLLGSKSLAALRAAamide, and a 13 rather than 12 amino acid long SIFamide, i.e. GPYRKPPFNGSIFamide. These data not only provide the first descriptions of native amphipod neuropeptides, but also represent a new resource for initiating investigations of peptidergic signaling in the Amphipoda.

  13. Redescription of five gnathiid species from Japan (Crustacea: Isopoda).

    Science.gov (United States)

    Ota, Yuzo

    2013-01-01

    Five gnathiid species from Japan are redescribed based on14 holotypes, their paratypes, topotypes, and new materials. Observations of these specimens revealed that Caecognathia kikuchii (Nunomura, 1992) should be transferred to genus Elaphognathia and Caecognathia nasuta (Nunomura, 1992) to genus Gnathia. Furthermore, Caecognathia amakusaensis Nunomura, 1992, C. saikaiensis Nunomura, 1992, Gnathia azumai Nunomura, 2012a, G. quadricephala Nunomura, 2012a, and G. recticornata Nunomura, 2012a are considered to be junior synonyms of E. kikuchii. Gnathia hirayamai Nunomura, 1992, G. nagasakiensis Nunomura, 2012a, G. shijikiensis Nunomura, 2012a, and G. brevicephala Nunomura, 2012a are considered to be junior synonyms of G. nasuta. Moreover, Gnathia sanrikuensis Nunomura, 1998 and G. mutsuensis Nunomura, 2004 are redescribed. Gnathia bungoensis Nunomura, 1982 is not completely redescribed because the key characteristics were lacking. The geographical records of these species are provided.

  14. The spelling of the name Sarothrogammarus (Crustacea, Amphipoda)

    NARCIS (Netherlands)

    Stock, Jan H.

    1972-01-01

    In my recent revision of the Sarothrogammarus-group (Bijdr. Dierk., 41: 94—129, 1971), I consistently used the spelling Sarathrogammarus. Professor S. Ruffo, of Verona, kindly pointed out to me that the original spelling of the name is Sarothrogammarus (see Martynov, 1935, Trav. Inst. zool. Acad. Se

  15. On some species of the genus Nephrops (Crustacea Decapoda)

    NARCIS (Netherlands)

    Holthuis, L.B.

    1964-01-01

    The present note is based in the first place on the Nephropsid material collected by the Australian Fisheries Steamer "Endeavour" in the waters of South and East Australia, while also the West Indian Nephrops specimens in the collections of the U.S. National Museum, Washington, D.C., and the Rijksmu

  16. Molecular effects of diethanolamine exposure on Calanus finmarchicus (Crustacea: Copepoda)

    Energy Technology Data Exchange (ETDEWEB)

    Hansen, Bjorn Henrik, E-mail: bjorn.h.hansen@sintef.no [SINTEF Materials and Chemistry, Marine Environmental Technology, Brattorkaia 17B, N-7465 Trondheim (Norway); Altin, Dag [BioTrix, N-7022 Trondheim (Norway); Booth, Andy; Vang, Siv-Hege; Frenzel, Max; Sorheim, Kristin Rist; Brakstad, Odd Gunnar [SINTEF Materials and Chemistry, Marine Environmental Technology, Brattorkaia 17B, N-7465 Trondheim (Norway); Storseth, Trond R. [SINTEF Fisheries and Aquaculture, N-7465 Trondheim (Norway)

    2010-08-15

    Alkanolamines are surface-active chemicals used in a wide range of industrial, agricultural and pharmaceutical applications and products. Of particular interest is the use of alkanolamines such as diethanolamine (DEA) in the removal of CO{sub 2} from natural gas and for CO{sub 2} capture following fossil fuel combustion. Despite this widespread use, relatively little is known about the ecotoxicological impacts of these compounds. In an attempt to assess the potential effects of alkanolamines in the marine environment, a key species in the North Atlantic, the planktonic copepod Calanus finmarchicus, was studied for molecular effects following sublethal exposure to DEA. DEA-induced alterations in transcriptome and metabolome profiling were assessed using a suppression subtractive hybridization (SSH) gene library method and high resolution magic angle spinning nuclear magnetic resonance (HR-MAS NMR), respectively. Effects were observed on transcription of genes reportedly involved in lipid metabolism, antioxidant systems, metal binding, and amino acid and protein catabolism. These effects were accompanied by altered expression of fatty acid derivates, amino acids (threonine, methionine, glutamine, arginine, alanine and leucine) and cholines (choline, phosphocholine and glycerophosphocholine). Together, SSH and HR-MAS NMR offer complementary screening tools for the assessment of molecular responses of C. finmarchicus to DEA and can be used in the study of other chemicals and organisms. Concentration-response and time-response relationships between DEA exposure and single gene transcription were investigated using quantitative PCR. Specific relationships were found between DEA exposure and the transcription of genes involved in protein catabolism (ubiquitin-specific protease-7), metal ion homeostasis (ferritin) and defence against oxidative stress ({gamma}-glutamylcysteine synthase, glutathione synthase and Cu/Zn-superoxide dismutase). At the lowest alkanolamine concentration used in these experiments, which corresponded to 0.5% of the LC{sub 50} concentration, no transcriptional effects were observed, giving information regarding the lower molecular effect level. Finally, similar transcription patterns were observed for a number of different genes following exposure to DEA, which indicates analogous mechanisms of toxicity and response.

  17. [Marine biodiversity of Costa Rica, the microcrustacea: Copepoda (Crustacea: Maxillopoda)].

    Science.gov (United States)

    Morales-Ramírez, A

    2001-12-01

    This report is part of a series that summarizes the species and localities of Costa Rican marine taxa. A review of the literature on copepods, both pelagic and benthic for the Pacific and Caribbean coast of Costa Rica, includes eighty species. Sixty seven pelagic species have been found, distributed between sixteen calanoid, one cyclopoid, three harparticoid and four poecilostomatoid families. Moreover, thirteen benthonic species distributed into six families, all harparticoids, are reported. Among the pelagic families, Pontellidae has six species, while Paracalanidae and Eucalanidae had five each. Other families, like Calanidae, Pseudodiaptomidae and Acartiidae had four species and most families only one. Forty five species are reported only for the Pacific coast, thirteen for the Caribbean coast, only nine species occurred in both coasts; being a direct consequence of the more intensive research effort in the Pacific. Pelagic copepod biodiversity reflects different oceanographic conditions in both coasts. Typical estuarine species were found in the lower region of the Gulf of Nicoya, while a mixture of estuarine and oceanic species were found in Golfo Dulce. Diversity in the Caribbean, specially at the Cahuita coral reef is lower in comparison with the copepod diversity found in other regions in the Caribbean sea. This may be due to the high sediment resuspension rate characteristic of the Cahuita coral reef, which could affect the reproduction of many holozooplankters, specially copepods. Although sixty seven pelagic copepod species appears to be in low numbers, in terms of specific biodiversity it is as high when compared to numbers found in other tropical areas. Thirteen species are reported in the literature, all harparticoids. Five species, three sub-species and one genera were new to science. Balacopsylla is reported for the first time from a neotropical regions, while the genus Karllangia, represented by two coexisting species in the Caribbean coast, belong to a few circumtropical-subtropical genera. The most diverse family was Tetragonicipitidae. This is the first effort to summarize the available information about the biodiversity of marine copepods for Costa Rica's coasts.

  18. Amphipoda (Crustacea) from Palau, Micronesia: Families Maeridae and Melitidae.

    Science.gov (United States)

    Myers, A A

    2016-09-26

    Seven species of senticaudate amphipods belonging to the families Maeridae and Melitidae are recorded from Palau, Federated States of Micronesia, and are figured. Three species are new to science and are fully described and figured.

  19. Fertilizers for Daphnia sp. (Crustacea, Cladocera) production in experimental tanks

    OpenAIRE

    Cunha, Patrícia de Souza Lima; Lanna,Eduardo Arruda Teixeira; Bastos,Rafael Kopschitz Xavier; Quadros,Moisés; Rezende,Fabrício Pereira; Freitas,Leandro Monteiro de

    2010-01-01

    The current study was aimed at investigating the use of different fertilizers - dicalcium phosphate, biosolid and quail feces - as a strategy for water fertilization in Daphnia sp production. It was used twenty-four 100-L tanks of asbestos cement distributed in a completely randomized split-plot design with six replicates, with plots in the three kinds of fertilizers (biosolid, dicalcium phosphate, and quail feces) and a control without fertilization (WF) and subplots at the times of assessme...

  20. Phylogeny of the Paracalanidae Giesbrecht, 1888 (Crustacea: Copepoda: Calanoida).

    Science.gov (United States)

    Cornils, Astrid; Blanco-Bercial, Leocadio

    2013-12-01

    The Paracalanidae are ecologically-important marine planktonic copepods that occur in the epipelagic zone in temperate and tropical waters. They are often the dominant taxon - in terms of biomass and abundance - in continental shelf regions. As primary consumers, they form a vital link in the pelagic food web between primary producers and higher trophic levels. Despite the ecological importance of the taxon, evolutionary and systematic relationships within the family remain largely unknown. A multigene phylogeny including 24 species, including representatives for all seven genera, was determined based on two nuclear genes, small-subunit (18S) ribosomal RNA and Histone 3 (H3) and one mitochondrial gene, cytochrome c oxidase subunit I (COI). The molecular phylogeny was well supported by Maximum likelihood and Bayesian inference analysis; all genera were found to be monophyletic, except for Paracalanus, which was separated into two distinct clades: the Paracalanus aculeatus group and Paracalanus parvus group. The molecular phylogeny also confirmed previous findings that Mecynocera and Calocalanus are genera of the family Paracalanidae. For comparison, a morphological phylogeny was created for 35 paracalanid species based on 54 morphological characters derived from published descriptions. The morphological phylogeny did not resolve all genera as monophyletic and bootstrap support was not strong. Molecular and morphological phylogenies were not congruent in the positioning of Bestiolina and the Paracalanus species groups, possibly due to the lack of sufficient phylogenetically-informative morphological characters. Copyright © 2013 Elsevier Inc. All rights reserved.