Sample records for RIO BLANCO (white river)
from WorldWideScience.org

Sample records 1 - 8 shown.



1

Variabilidad de cepas de Hirsutella thompsonii, a partir de ácaros fitófagos en tres sistemas terrestres del estado de Colima, México/ Variability of Hirsutella thompsonii strains, isolated from phytophagous mites from three terrestrial systems in the State of Colima, México

Rosas-Acevedo, José Luis; Sampedro-Rosas, Laura
2006-06-01

Resumen en español Entre 1999 y 2004 se obtuvieron diez cepas del hongo Hirsutella thompsonii Fisher, a partir de ácaros infectados, en 9 localidades de 3 de los 11 sistemas terrestres que tiene el estado de Colima, México: Llanura Costera de Tecomán, Llanura Costera de Cuyutlán y Valle del río Armería. De las 10 cepas, 5 pertenecen a la variedad thompsonii que es de crecimiento micelial mullido, ligeramente elevado, de color gris a gris verdoso, y 5 a la variedad sinematosa Samson, M (mas) cCoy y O'Donnell, de apariencia plana y coloración blanco a amarillo. Los hospedantes fueron araña roja (Tetranychus urticae Koch), eriófidos (Aceria guerreronis Keifer y Phyllocoptruta oleivora Ashmead) y brevipálpidos (Brevipalpus phoenicis Geijkes) sobre cítricos como hospedero de 8 de los 10 aislamientos. De ellos, sólo la cepa HtM130 de H. thompsonii var. thompsonii presentó formación de exudados en la fase esporulativa, característica que le da mayor potencial de manejo en estrategias para el control de ácaros fitopatógenos. El tipo de crecimiento y la coloración de las cepas no se correlacionan con el sistema terrestre donde se encontraron, ni con las condiciones climáticas imperantes en ellos. La presente contribución demuestra la importancia de valorar la presencia de enemigos naturales autóctonos para garantizar un mejor establecimiento bajo las condiciones agroclimáticas de la región donde se pretenda utilizarlos, y antes de introducir microorganismos comerciales o aislamientos de otros sitios para no afectar los sistemas naturales de regulación. Resumen en inglés Between 1999 and 2004, ten strains of the fungus Hirsutella thompsonii Fisher were isolated from infected acari, in 9 localities of 3 of the 11 terrestrial systems found in the state of Colima, Mexico: Coastal Plain of Tecomán, Coastal Plain of Cuyutlán and Valley of the Armería river. Of the 10 strains, 5 belong to var. thompsonii, whose growth is fluffed mycelial, slightly tall, gray to greenish gray, and 5 to var. sinematosa, with a flat appearance, white to yellow. (mas) The hosts were two-spotted spider mite (Tetranichus urticae), Eriophidae (Aceria guerreronis and Phyllocoptruta oleivora) and Brevipalpidae (Brevipalpus phoenicis), Citrus spp. being the host of the acari in 8 of the 10 isolations. Of the 10 strains, only one HtM130 strain of H. thompsonii var. thompsonii displayed exudate formation in the sporulative phase, characteristic that gives it greater potential for implementation in management strategies for the control of phytophagous acari. Strain coloration and growth are not correlated with the terrestrial system where they were found, nor to prevailing climatic conditions in the system. This contribution demonstrates the importance of assessing the presence of native natural enemies, before introducing commercial microorganisms or isolations from elsewhere so as not to affect the natural regulatory systems.

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2

Lutitas negras lacustres cercanas al límite Paleógeno-Neógeno en la región noroccidental de la provincia del Neuquén: Evidencias palinológicas/ Lacustrine black shales near to the Paleogene - Neogene boundary in north-western Neuquén Province: palynological evidence

Leanza, H. A.; Volkheimer, W.; Hugo, C. A.; Melendi, D. L.; Rovere, E. I.
2002-09-01

Resumen en español Se muestrearon con fines palinológicos sedimentitas lacustres referidas a la Formación Lileo nov. aflorantes en las cercanías de la localidad de Los Miches, en el noroeste de la provincia del Neuquén, República Argentina. Sobre la base del análisis microflorístico las capas portadoras de palinomorfos pueden asignarse al Oligoceno Tardío - Mioceno Temprano. Las rocas muestreadas se caracterizan por lutitas negras, gris verdosas, gris oscuras y castaño claras, alte (mas) rnando con niveles delgados, a veces oolíticos de calizas gris claras, con superficie de meteorización blanco amarillenta. Entre estas sedimentitas se intercalan andesitas, tobas y aglomerados volcánicos de composición mesosilícica. En los afloramientos del área del río Guañacos se observan capas irregulares de carbonato fibroso tanto como baritina nodular con estructura fibroradial, junto con bivalvos indeterminados de agua dulce. La asociación microflorística muestra relativamente baja diversidad. En general, el género Nothofagidites domina la asociación. Los componentes principales de la microflora consisten en granos de polen pertenecientes a varios taxones de angiospermas, tales como Baumannipollis sp. cf. B. variaperturatus, Corsinipollenites atlantica, Milfordia sp., Nothofagidites saraensis, Smilacipites sp. cf. S. echinatus and Tricolpites asperamarginis junto con granos de polen de angiospermas de Araucariacites australis, Equisetosporites notensis y Podocarpidites spp. Los elementos de Pteridophyta/Bryophyta están representados por Cyatheacidites annulatus, Cicatricosisporites sp., Deltoidospora sp., Lycopodiumsporites austroclavatidites, Ricciaesporites sp. y Laevigatosporites ovatus, mientras que entre los taxones lacustres se reconocieron Azolla sp. y Botryococcus sp. (Chlorophyta). Resumen en inglés Lacustrine sedimentary rocks referred to the Lileo Formation nov. cropping out near Los Miches locality, northwestern Neuquén Province, Argentine Republic, were sampled for palynological study. On the basis of the microfloristic analysis, the palynomorph-bearing beds can be ascribed a Late Oligocene to Early Miocene age. The sampled rocks are black, grey-green, dark grey and light brown shales alternating with thin,locally oolithic, light grey limestones, with yellowish (mas) white weathering. Among these rocks are interbedded andesites, tuffs, and volcanic agglomerates of mesosilicic composition. In the outcrops of the Guañacos river area, some irregular beds of fibrous carbonate have been observed as well as fibroradial nodular barite, together with some indeterminate fresh-water. The microfloristic assemblages have a relatively low diversity. In most of them the genus Nothofagidites dominates the association. The components present in the microflora are pollen grains corresponding to several angiosperm taxa, such as Baumannipollis sp. cf. B. variaperturatus, Corsinipollenites atlantica, Milfordia sp., Nothofagidites saraensis, Smilacipites sp. cf. S. echinatus and Tricolpites asperamarginis together with gymnosperm pollen grains of Araucariacites australis, Equisetosporites notensis and Podocarpidites spp. The Pteridophyta/Bryophyta elements are represented by Cyatheacidites annulatus, Cicatricosisporites sp., Deltoidospora sp., Lycopodiumsporites austroclavatidites, Ricciaesporites sp. and Laevigatosporites ovatus, whereas among the lacustrine taxa Azolla sp. and Botryococcus sp. (Chlorophyta) were recognized.

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4

Nature and Culture in Prehistoric Amazonia Using G.I.S. to reconstruct ancient ethnogenetic processes from archaeology, linguistics, geography, and ethnohistory

Eriksen, Love

This thesis investigates the socio-cultural and linguistic development of pre-Columbian Amazonia, with a particular focus on the period between 500 BC and AD 1500. In assembling and analyzing data from archaeology, linguistics, ethnohistory, ethnography, and geography in a Geographical Information S...

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5

Comparación de métodos de muestreo en la caracterización de la biodiversidad de hifomicetos acuáticos en el río cúpira, estado Carabobo, Venezuela/ Comparison of sampling methods for the characterization of aquatic hyphomycetes biodiversity in the cupira river, Carabobo, Venezuela/ Comparação dos sistemas da coleção da amostra para caracterização da biodiversidade de hyphomycetes aquáticos no rio de cúpira (la Cumaca, edo. Carabobo)

Pinto, Massiel; Fernández Da Silva, Rafael; Smits, Gunta
2009-07-01

Resumen en portugués Diferentes métodos da coleção da amostra foram avaliados para caracterização mensal da biodiversidade dos hyphomycetes aquáticos da "La Cumaca" no Río Cúpira (Municipalidade de San Diego, estado de Carabobo). A identificação da espécie destes fungos foi realizada das amostras da espuma naturai (branca ou amarela), da espuma artificial e da incubação aleatòria das folhas coletadas. A diversidade dos hyphomycetes aquáticos variou com o método de coleção da (mas) amostra; o maior número de espécies foi com espuma natural, com 41 espécies com espuma branca e 30 com espuma amarela. No segundo lugar foi para a espuma artificial com 19 espécies, seguido pela incubação aleatòria das folhas coletadas com 12 espécies. As espécies mais abundantes e mais comuns em todos os métodos de coleção da amostra foram: Alatospora acuminata, Anguillospora longissima, Campylospora sp., Clavatospora tentacula, Flagellospora curvula, Heliscus submersus, Lunulospora cymbiformis e Triscelophorus monosporus. Resumen en español Diferentes métodos de colección de muestras fueron evaluados para caracterizar mensualmente la biodiversidad de hifomicetos acuáticos en el Río Cúpira sector La Cumaca (Municipio San Diego, Estado Carabobo, Venezuela). La identificación de las especies de hongos acuáticos se realizó por examen de muestras de espuma natural (blanca o amarilla), de espuma artificial e incubación de hojas tomadas al azar. Se encontró que la diversidad de hifomicetos acuáticos vari (mas) aba con el método de colección de muestra, evidenciándose el mayor número de especies al utilizar espuma natural. Con la espuma blanca fueron reportadas 41 especies, 30 con la amarilla, 19 en espuma artificial y 12 especies con el método de incubación de hojas. Las especies más abundantes y comunes en todos los sistemas de colección de muestra fueron: Alatospora acuminata, Anguillospora longissima, Campylospora sp., Clavatospora tentacula, Flagellospora curvula, Heliscus submersus, Lunulospora cymbiformis, y Triscelophorus monosporus. Resumen en inglés Different sampling methods were evaluated for a monthly characterization of aquatic hyphomycetes biodiversity in the Cupira river (La Cumaca sector, San Diego municipality, Carabobo state, Venezuela). Species were identified in natural foam samples (white or yellow), artificial foam and by incubation of randomly collected leaves. Diversity varied with the sampling method, the greater number of species being found in natural foam, with 41 species reported from white natura (mas) l foam and 30 from yellow natural foam. In artificial foam, 19 species were reported, and in incubated leaves, 12 species. The most abundant and common species in all the sampling methods were: Alatospora acuminata, Anguillospora longissima, Campylospora sp., Clavatospora tentacula, Flagellospora curvula, Heliscus submersus, Lunulospora cymbiformis and Triscelophorus monosporus.

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6

Catálogo de especies arbustivas de los bosques ribereños en el Área Acuo-Sipapo-Orinoco Medio, Municipio Autana, Estado Amazonas

AVENDAÑO, Neida; CASTILLO, Aníbal
2006-01-01

Resumen en español Se presenta una lista de las especies arbustivas de los bosques ribereños del área Cuao-Sipapo y las confluencias del Río Cuao en el Río Sipapo y de este último en el Orinoco. La selección de esta área se fundamentó en las características ecológicas, la vegetación boscosa y la importante variación hidrológica que presentan los ríos y sus confluencias, así como también las características físico-químicas de las aguas, lo que permite diferenciar tres tipo (mas) s de ríos (aguas negras, aguas blancas y aguas claras). Se identificaron taxonómicamente 22 familias, 46 géneros y 74 especies de arbustos. De estas especies, Chomelia volubilis, Piptocoma areolata, Psychotria vasivensis, Tococa lancifolia y Turnera castilloi son endémicas para el estado Amazonas. Las familias Rubiaceae y Melastomataceae son las dominantes con respecto al número de especies ya que están representadas por el 51,34% del total de las especies estudiadas. Resumen en inglés ABSTRACT A list of shrub species in the riparian forests of the Cuao-Sipapo area, the convergence of the Cuao and Sipapo rivers and the junction of the Sipapo with the Orinoco river is given. The study area was selected on ecological particularities, forest vegetation characteristics, hydrological variations presented by these rivers and their confluence zones; plus the chemical-physical characteristics of their water which allow the differentiation of three types of rive (mas) rs (black, white and clear waters). Twenty-two families,46 genera and 74 species of shrubs were identified, including Chomelia volubilis, Piptocoma areolata, Psychotria vasivensis, Tococa lancifolia and Turnera castilloi, which are endemic to Amazonas state. Rubiaceae and Melastomataceae were the dominant families in species number, representing 51.34% of the species studied.

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7

Aspectos sedimentológicos y estratigráficos de los depósitos cuaternarios de la costa platense del Departamento de Canelones (Uruguay)/ Sedimentologic and stratigraphic aspects of the Quaternary deposits along the Plata Coast on the Departamento de Canelones (Uruguay)

Goso Aguilar, César
2006-07-01

Resumen en español Esta contribución brinda elementos sedimentológico-estratigráficos de los depósitos cuaternarios que aparecen en los acantilados y plataformas en la costa rioplatense del Departamento de Canelones, Uruguay. Se constató la presencia de depósitos regresivos e ingresivos cuaternarios, materializados por los sedimentos pleistocénicos transicionales de la Formación Chuy y los continentales de las formaciones Libertad y Dolores, así como los transicionales holocénicos (mas) de la Formación Villa Soriano. Se caracteriza litológicamente cada unidad, se interpretan los procesos actuantes y se hacen inferencias acerca de los ambientes de sedimentación involucrados. Resumen en inglés The Uruguayan Quaternary record has been studied by several authors in the last four decades. The Quaternary glacial and interglacial record shows a few tens meters of thickness and is integrated by both sediments and non-depositional surfaces. The sedimentary package is better exposed in the southern region and coastal area of Uruguay. The non-depositional surfaces (iron crust) and paleosoils are better exposed in the north and eastern region. The Lithostratigraphic colu (mas) mn proposed by Goso (1965, 1972) focuses the Quaternary record with a precursor genetic point of view, integrating lithologic, geomorphologic and climate conditions. However, this stratigraphic proposal was partially adopted and understood by some scientists. Transitional sediments of the Pleistocene Chuy Formation and continental deposits of Libertad and Dolores formations are present. Also, transitional Holocene sediments of Villa Soriano Formation were shown and are described (Fig. 1). The goal of this paper is to contribute to the knowledge of a part of this record especially towards some sedimentologic and stratigraphic features of the Quaternary deposits exposed along Rio de la Plata coast in the Canelones Department, Uruguay (Figure 2). The Chuy Formation is very well exposed in Villa Argentina and Las Vegas - La Floresta beaches. It is integrated mainly by white conglomerates and coarse to fine sandstones with current and wave traction structures and trace fossils. Also contains fossiliferous green clay deposits. It looks with variable thickness since a few meters to twenty five meters (Figs. 3 and 5). It was deposited during an interglacial period in transitional sedimentary environment, predominantly the shoreface portion in a barrier island and lagoon systems, into tidal conditions. The top of this lithofacies sequence shows a thin (few centimetres) iron crust in the area. This non-depositional surface was also observed in others inner Canelones localities (several Santa Lucia river sections). The Libertad and Dolores Formations can be observed in several localities along the studied area. They are composed mainly of brownish fangolites and silt-clay sediments. Massive, parallel lamination, incised lobes and tabular deposition are the main structures and geometries exposed of these units (Figs 4-8). They were deposited during a Pleistocene glacial period with the alternance of semiarid and temperate conditions and materialize a continental sedimentation (gravity flows, reworked eolian deposits). These units show a few meters of thickness. The Villa Soriano Formation is present in La Floresta beach, Sarandí creek mouth, and is composed mainly by grey fangolites and black fossiliferous clays containing molluscs valves (Figs 3e and 9). This unit was deposited during the current interglacial period and materializes the last ingressive sea-level conditions. Considering both the coastal outcrops and subsurface distribution in Uruguay the Villa Soriano Formation represents the last holocenic embayments and shorelines. The thickness of this unit in the area is less than six meters. The coast of Canelones Department along Río de la Plata shows several meters of quaternary sequences in many locations. In these combined sections two transgressive-regressive cycles were observed and analyzed. The former is composed by sediments of the Libertad II (continental) and Chuy III (transitional) Formations deposited since Medium to Upper Pleistocene, while the latter is constituted by a few meters thickness of sediments that belongs to both Dolores (continental) and Villa Soriano (transitional) formations during the time interval Upper Pleistocene - Holocene.

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8

Arquitectura y paleoambientes de los depósitos fluviales gravosos de la Formación Las Cumbres (Neógeno), en Villa Mervil, La Rioja, Argentina/ Architecture and paleoenvironment of the fluvial gravel deposits of Las Cumbres formation (neogene), Mervil Village, La Rioja, nw-Argentina

Bossi, G.E.; Georgieff, S.M.; Vides, M.E.
2007-07-01

Resumen en español Un corte de la ruta nacional 60, 500 m al oeste de Villa Mervil (Sierras de Mazán, La Rioja) muestra el contacto entre las Formaciones Salicas y Las Cumbres, con excelente exposición de la arquitectura fluvial que pudo ser extendida en tres dimensiones y por más de 700 m en sentido N-S, a ambos lados de la ruta. El corte muestra el contacto entre las Formaciones Salicas (Plioceno) y Las Cumbres (Plio-Pleistoceno). Pueden ser reconocidos cinco estadios de sedimentación (mas) : A-S, el inferior, constituido por areniscas friables fluviales y eólicas; F, de capas tabulares consistentes en limos de barreal y areniscas de planicie de distributarios (escorrenteras y barras efímeras) con abundantes calcretos y rizoconcreciones; B, el mejor preservado y que ha permitido el análisis 3D, de conglomerados arenosos, que corta profundamente los dos estadios inferiores. El Estadio B está organizado en una serie de mesoformas de canal, con barrancas izquierdas (al Oeste) bien definidas. En su etapa final de abandono (Estadio L), fue rellenado por capas tabulares de arenas finas limos pardos, que contienen una arcilita verde y una capa de micrita blanca, que pueden asignarse a un depósito lacustre somero. Finalmente yace sobre todo el conjunto anterior, el Estadio C, de conglomerados finos arenosos que forman un extenso sistema de canales y planicie aluvial pero mal representado en estos afloramientos. Las particularidades de estos depósitos pueden ser comparadas con expresiones locales del ambiente actual: el río Pituil (al oeste de la Sierra de Velasco) la llanura arenosa del Bolsón de Pipanaco y el barreal del Señor de la Peña, donde impera un clima árido con una escasas lluvias estivales, indicado condiciones climáticas similares. Resumen en inglés A cut along the National Road 60, 400 m west of the Mervil Village, a small town located at the southern end of the "Bolsón de Pipanaco" (Pampean Ranges of NW-Argentina) unveils a 3-D fluvial and eolian architecture in beds that belong to the stratigraphic passage between the Salicas (Pliocene) and Las Cumbres (Plio- Pleistocene) Formations (Fig. 1 and 2). Fossil mammals found in the Salicas Formation belong to the Huayquerian fauna that could be dated in the Pliocene (B (mas) ossi et al., 1996). A four-fold classification of contacts hierarchy (Allen, 1983) was used to define individual sedimentary bodies and their associations: order 0, are the contacts between laminas within a laminaset; order 1 are the contacts between laminasets (represented by parallel or crossbedded cogenetic packages); order 2 contacts, cut order 1 contacts and embrace bedded packages or storeys, limited themselves by order 1 contacts, that show a similar genetic emplacement (similar features in outcrops); finally the order 3 contacts, cut and embrace sedimentary bodies limited by order 2 contacts, defining major groups or stages. Five distinct stages were recognized (Fig. 3): a lower A-S stage, covered by an extended floodplain F stage, cut deeply by the gravelly stage B, partially filled by L stage, and covered by the fluvial gravelly C stage at top (Fig. 4 and 5). The sandy A-S stage consists of channel and sandflat deposits formed by alternating fluvial (A) and eolian (S) storeys. Facies assamblage "A" is an association of 9 storeys (Fig. 3) composed of moderate sorted massive or cross-bedded sandstones, with few subrounded pebbles (schists and granites) in or near their concave bases. Most of the A storeys bottoms, are covered by a 1-5 cm thick silty shale drapes slightly disturbed or forming clay galls partially curled and/or removed (Fig. 4b and c). The facies assemblage S, is an association of 6 storeys (painted white in Fig. 5b and c) formed by well-sorted fine to medium size sandstones with occasional mud intraclasts (pebble sizes, not eolian materials probably incorporated by gravity collapse or sudden water sheets). The meter thick silty "F1" storey (Fig. 4 b and e) is composed of 10 to 11 tabular decimeter slightly endurated beds, interpreted as playa lake ("barreal") deposits by comparation with very similar sediments that fill the nearby barreal "El Señor de la Peña" a typical endorheic depression. This "F1" horizon is the source of most irregular blocks found at the foot of the left margin bank cuts of the B stage. The F2 storey (Figs. 3 and 4b) is composed of 0.90 m tabular to lenticular coarse sandstone horizon crowded of calcretes and rhyzoconcretions defining a paleosol horizon. The F3 storey is also composed of massive to crossbedded ill-sorted pebble coarse sandstones. Both F2 and F3 storeys were deposited by sudden floodings not conected to visible channel locations. The F3 storey is not related with the F2 storey calcretization. There are six irregular and lenticular storeys in the "B" stage, defined by concave and convex stratification designs. These storeys could be considered mesoforms in the sense of Bridge (1985, 1993) of the macroform "B". A close correlation of the contacts shown in the two walls of the road cut associated with contact orientation measurements and paleocurrents, allowed to built models of the 3D situation in several evolution steps starting with storey B2 ending up in storey B6 (Figs. 6 a-c). The B channel stage is deeply incised on the F and A-S stages indicating a change of the equilibrium profile. The B stage itself, represented by storeys B5 and B6, were mapped beyond the road cut for an extension of 700 m (in N-S sense) yielding a map that shows a NE-trending low sinuosity river with cut banks, lateral bar deposits, overbank deposits deposits with variable width.The last block (Fig. 6d) shows the abandon "L" stage of lacustrine fillings (see Fig. 3 for stratigraphy relations and Fig. 4 for details), composed of at leat four storeys, three of them (L1, L2 and L3) are fillings of the central part of the pond and a fourth (L4) a clinoform, is a lateral deposit. The stage C outcrops at the top of the wall cuts covering though a third order contact, the stages F, L and B. It is composed of fine to medium size fluvial gravels without visible bank cuts. The very limited lateral and vertical exposures preclude it, from a further discussion. Most paleocurrent measurements were taken in the axis of concave structures (crossbeddings) and the points where the order 2 contacts merge into the basal order 3 contact. The point of merging of the order 2 and 3 contacts in convex stratified bodies, indicates the position of the bar structure, the paleocurrents at their bases show the local direction of the bar slope in this particular stage of growing (Fig. 7). Converging or diverging paleocurrent patterns at the outcrop face combined with vertical textural variations, unveil the position of the outcrop cut in relation to the hidden 3D structure. Most of the mapped architectural features yielded also paleocurrents measurements on cross-bedding and pebble imbrications that were integrated with the textural and structural evidences (Fig. 9). The scheme of Fig. 7 was used in the model of Fig. 9 to position the bar designs on the plan. The model of Fig. 9b, is a cartoon of a slightly ondulate landscape crossed from SSW to NNE by the B stage river channel. Fig. 8 shown the succesive bank cuts created by the B stage channel during its migration to west. Calcretes and rhizoconcretions over convex or tabular gravels storeys, mapped as inside features of channel "B", indicate an ephemeral regime with riparian vegetation (Fig. 9). The Pituil River (Fig. 10) draining the northwest end of the Velasco Range and the sandy plains located north of the Mazán Range and near the center of the "Bolsón de Pipanaco" were used as modern analogs of the ancient Mervil channel system (stages B and A-S respectively). The structural details shown by the Salicas Formation at the Mervil area around the road cut, are also present in the modern analogs, indicating a similar arid climate.

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