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Registros recuperados: 50
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A River Story: Waters in the Godineau Swamp OceanDocs
Tipo: Other Palavras-chave: Swamps; Fish; Aquatic environment; Rivers; Wetlands; Swamps; Fish; Rivers; Wetlands; Aquatic environment; Http://aims.fao.org/aos/agrovoc/c_7544; Http://aims.fao.org/aos/agrovoc/c_15903; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_8371; Http://aims.fao.org/aos/agrovoc/c_554.
Ano: 2003 URL: http://hdl.handle.net/1834/2916
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Análisis de contaminantes inorgánicos tóxicos en las aguas del Rio Almendares, Cuba OceanDocs
Rodríguez, A.J.; Arpajón, I.; Castaño, Z.; Marsán, R.; Lugo, D.; Roevros, N.; Chou, L.; Rojas, N.; Heydrich, M..
The Almendares River constitutes the most important superficial stream in Cuban capital, that finishes in the Metropolitan Park of Havana, which is an entertaining centre. The objective of this work is to determine the presence of toxic inorganic pollutants in the Almendares River water. 10 samplings were carried out from June 2003 to May 2004 in 14 stations established along the last 10 km of the river and 3 tributaries. The quantification of nitrates, nitrites and ammonium was done by spectrophotometric methods The concentration of heavy metals in the dissolved and particulate phase was determined by atomic emission spectrometry. The total microbial charge was determined by epifluorescency. Were found high levels of ammonium and nitrites, as well as high...
Tipo: Proceedings Paper Palavras-chave: Rivers; Freshwater pollution; Heavy metals; Rivers; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2006 URL: http://hdl.handle.net/1834/2086
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Análisis del comportamiento de la salinidad (intrusión salina) en el sistema Río Guayas Canal de Jambelí como parte del cambio climático OceanDocs
Arreaga Vargas, P..
El presente trabajo permite conocer el comportamiento de la cuña salina en el sistema Río Guayas - Canal de Jambelí, conociendo que el Río Guayas abastece de agua a Guayaquil, puerto principal del país, y a muchas otras poblaciones.
Tipo: Journal Contribution Palavras-chave: Water quality; Sea level; Climatic changes; Salt-wedge estuaries; Salt wedges; Salinity gradients; Irrigation water; River water; Rivers; Water quality; Irrigation water; Rivers; Sea level; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_3958; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_34115.
Ano: 2000 URL: http://hdl.handle.net/1834/2274
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Aporte al conocimiento del zooplancton de agua dulce y estuarina del río Guayas. Guayaquil - Ecuador OceanDocs
Luzuriaga de Cruz, M..
El presente trabajo corresponde al análisis de zooplancton colectado en cinco estaciones localizadas en el río Guayas. La primera estación estuvo situada 10 km. río arriba de la confluencia del río Babahoyo con el río Daule, en un pozo acuífero. Las otras estaciones se situaron en cuatro sitios consecutivos a lo largo del río Guayas. En este trabajo se han identificado 10 especies: Brachionus plicatilis (O. F. Muller) (Rotifera), Alona cambouei Guerne and Richard, 1893; Moina micrura Kurz, 1874 (Cladocera); Acartia tonsa Dana, 1848; Oithona dissimilis Linberg, 1940; Oithona neotropica Herbs, 1967; Oithona oligohalina Fonseca o Bjornberg, 1976; Mesocyclops longisetus (Thiebaud, 1914) y Pseudodiaptomus longispinosus Chad, 1989 (Copepoda). Las especies...
Tipo: Journal Contribution Palavras-chave: Zooplankton; Fresh water; Geographical distribution; Rivers; Estuaries; Brackish water; Zooplankton; Geographical distribution; Rivers; Estuaries; Brackish water; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_1049.
Ano: 1998 URL: http://hdl.handle.net/1834/2295
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Aspectos biológicos y pesqueros de los principales peces del sistema hídrico de la provincia de Los Ríos, durante 2009 OceanDocs
Revelo, W..
Durante el 2009 (excepto mayo, agosto y septiembre), se analizaron un total de 3 772 especímenes de peces conformados por 16 especies, predominando la dica con 1561 individuos (42,3%), las menos capturadas fueron róbalo y chame con un individuo cada una (0,03%). La proporción de sexo macho hembra, talla promedio de captura y media de madurez sexual de las principales especies de peces fue: dama (1: 1,16; 23,7 y 20 cm LT), dica (1: 1,15; 17,3 y 16 cm LT), guanchiche (1: 1,2; 29 y 20 cm LT), ratón (1: 1,25; 23,5 y 19 cm LT) y bocachico (1:1,06; 21,6 y 20 cm LT). En los estadios de madurez sexual, la mayoría de las especies se encontraron en estadio I y II correspondientes a individuos hembras inmaduras; sin embargo, para el guanchiche predominaron las...
Tipo: Journal Contribution Palavras-chave: Rivers; Species diversity; Sexual maturity; Growth rate; Catch composition; Freshwater fish.
Ano: 2010 URL: http://hdl.handle.net/1834/4790
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Assessing the performance of macroinvertebrate metrics in the Challhuaco-Ñireco System (Northern Patagonia, Argentina) Iheringia, Sér. Zool.
Mauad,Melina; Miserendino,M. Laura; Risso,Miguel A.; Massaferro,Julieta.
ABSTRACT Seven sites were examined in the Challhuaco-Ñireco system, located in the reserve of the Nahuel Huapi National Park, however part of the catchment is urbanized, being San Carlos de Bariloche (150,000 inhabitants) placed in the lower part of the basin. Physico-chemical variables were measured and benthic macroinvertebrates were collected during three consecutive years at seven sites from the headwater to the river outlet. Sites near the source of the river were characterised by Plecoptera, Ephemeroptera, Trichoptera and Diptera, whereas sites close to the river mouth were dominated by Diptera, Oligochaeta and Mollusca. Regarding functional feeding groups, collector-gatherers were dominant at all sites and this pattern was consistent among years....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Patagonian; Rivers; Macroinvertebrates; Biotic indexes; Water quality.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212015000300348
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Bacteria and phytoplankton production rates in eight river stretches of the middle Rio Doce hidrographic basin (southeast Brazil) BABT
Petrucio,Mauricio Mello; Barbosa,Francisco Antônio R.; Thomaz,Sidinei Magela.
Measurements of bacterial secondary production (BSP), together with primary phytoplanktonic production (PPP) were conducted during dry and rainy seasons, in eight rivers of different orders submitted to different degrees of human impacts (different trophic degree). We aimed to determine and compare the importance of BSP and PPP in carbon fixation in these different lotic ecosystems. Our results showed that the Ipanema River was the most modified system by anthropogenic effluents inputs. These inputs altered the trophic degree and BSP rates of these streams and rivers.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterioplankton; Carbon; Phytoplankton; Rivers; Trophic state.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000300019
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Calidad físico química y bacteriológica de las aguas alrededor de la ciudad de Guayaquil 1996 - 1998 OceanDocs
Valencia, M.; Palacios, C.; Rodríguez, A..
Siendo Guayaquil una de las ciudades más pobladas del Ecuador y de gran importancia en el desarrollo industrial del país, se determinó la necesidad de llevar a cabo un estudio de la calidad de aguas del río y esteros que bordean la ciudad, debido a que los asentamientos poblacionales e industriales han crecido descargando sus desechos a esos ecosistemas, sumándose a esto el déficit de los sistemas de alcantarillado. Se presenta los resultados de un estudio realizado en el Río Guayas desde el Muelle de la Unidad Nacional hasta la zona de las Esclusas considerando 9 estaciones ubicadas en 3 perfiles perpendiculares a las riberas del río a dos niveles de profundidad, superficie y 10 m., así como de la zona del Estero Salado comprendida entre el área de...
Tipo: Journal Contribution Palavras-chave: Water quality; River water; Water analysis; Nutrients (mineral); Dissolved oxygen; Petroleum hydrocarbons; Rivers; Marshes; Freshwater pollution; Brackishwater pollution; Estuaries; Water quality; Dissolved oxygen; Rivers; Estuaries; Water analysis; Marshes; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_16064; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 2000 URL: http://hdl.handle.net/1834/2309
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Composición, distribución y abundancia del plancton en sistemas fluviales de la provincia de Los Ríos, Ecuador OceanDocs
Prado, M.; Bucheli, R.; Calderón.G..
La composición, distribución y abundancia de las comunidades planctónicas de los ríos Mocache, Vinces, Babahoyo y el Humedal Abras de Mantequilla (Provincia de Los Ríos) fue analizada durante el 2009. Mensualmente en 29 zonas de pesca se recolectaron muestras para el análisis cualitativo y cuantitativo de fitoplancton, zooplancton e ictioplancton. Se identificaron 139 grupos fitoplanctónicos, 63 de zooplancton y fauna acompañante, así como 16 géneros y ocho especies de larvas de peces. La densidad de fitoplancton osciló entre 27 y 1 476 cel.m-3, mientras que el zooplancton entre 3 y 335 org.m-3 y las larvas de peces entre 2 y 1 026 org.m-3. Las especies dominantes fueron las diatomeas Fragilaria cf. longissima y Polymyxus coronalis, el insecto Baetis sp. y...
Tipo: Journal Contribution Palavras-chave: Rivers; Plankton studies; Composition; Distribution.
Ano: 2010 URL: http://hdl.handle.net/1834/4789
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Conflicts Associated with Dam Removal in Sweden Ecology and Society
The increasing number of deteriorating old dams that need renovation or have lost their function make dam removal a viable management option. There are at least four major reasons for dam removal: safety, law and policy, economy, and ecology. Here we discuss 17 Swedish dams that were recently considered for removal. Because dam removal usually causes controversy, dam removal initiatives may succeed, fail, or result in a compromise such as a bypass channel for migrating fish. We identify and discuss three major obstructions to dam removal: funding, cultural-historical values, and threatened species. To facilitate dam removal, the reasons for, and the effects of, dam removal must be carefully explained, and the public and stakeholders must be kept...
Tipo: Peer-Reviewed Insight Palavras-chave: Controversies; Dam removal; Information; Obstructions; Reservoirs; Rivers; Stakeholder involvement; Sweden.
Ano: 2009
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Contaminação por agrotóxicos nas águas da bacia do Alto Paraguai. Repositório Alice
CALHEIROS, D. F.; FERRACINI, V. L.; QUEIROZ, S. C. do N. de.
A bacia do Alto Paraguai, que contempla o Pantanal Mato-Grossense, tem a atividade agropecuária no planalto como uma das principais fontes de impactos ambientais para a planície. A contaminação por agrotóxicos utilizados nas extensas monoculturas de soja, cana-de-açúcar, algodão e milho é uma das mais importantes. Com o objetivo de avaliar a contaminação nas águas dos principais rios formadores do Pantanal, foram amostrados 24 pontos na área de transição planalto-planície durante as primeiras chuvas (novembro/2007) e analisados nove princípios ativos (simazina, metribuzim, atrazina, tebutiuron, diuron, clomazona, hexazinona, sulfentrazona e propanil). A maioria das 216 análises realizadas apresentou concentrações (em µg L-¹ amostra) abaixo do limite de...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Pantanal; Rios; Herbicidas; Pantanal wetland; Rivers; Herbicides.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/869802
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Deforestation, climate, and water regimes interactions in the southwestern Amazon. Repositório Alice
LIMA, L. S. de; SOARES FILHO, B.; COE, M. T.; CUADRA, S. V.; DIAS, L. C.; COSTA, M. H..
2012
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Uso da terra; Desmatamento; Clima; Hidrologia; Rio; Land use change; Deforestation; Climate; Hydrology; Rivers.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/955048
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Dinoflagelados bentónicos nocivos en sedimento de Jaimanitas costa NW de Ciudad de la Habana, Cuba. OceanDocs
Delgado, G.; Méndez, L.; Lechuga, C. H..
Durante un año fueron estudiados los dinoflagelados bentónicos nocivos agrupados sobre el sedimento de una ensenada donde desemboca el río Jaimanitas (región NW de Ciudad de la Habana). Se muestrearon seis puntos fijos sobre tres tipos de sedimentos: fango arenoso, areno-fangoso y arenoso. Prorocentrum fue el género dominante con cuatro especies y dentro de estas Prorocentrum lima, fue la más abundante en distribución espacial y temporal. La variación espacial de la densidad celular osciló entre 0.74 X 103 cél/cm3 y 2.36 X 103 cél/cm3 y la temporal fluctuó entre 0.12 x 103 cél/cm3 y 2.09 x 103 cél/cm3, registrándose el mínimo en enero y febrero, mientras que el máximo se obtuvo en agosto. Por el método del Escalado Multidimensional (MDS), se pudieron...
Tipo: Preprint Palavras-chave: Sediments; Rivers; Rivers; Http://aims.fao.org/aos/agrovoc/c_6617.
Ano: 2010 URL: http://hdl.handle.net/1834/3839
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Diversity and evolution of Amazonian birds: implications for conservation and biogeography Anais da ABC (AABC)
RIBAS,CAMILA C.; ALEIXO,ALEXANDRE.
Abstract: Amazonia has been a focus of interest since the early days of biogeography as an intrinsically complex and extremely diverse region. This region comprises an intricate mosaic that includes diverse types of forest formations, flooded environments and open vegetation. Increased knowledge about the distribution of species in Amazonia has led to the recognition of complex biogeographic patterns. The confrontation of these biogeographic patterns with information on the geological and climatic history of the region has generated several hypotheses dedicated to explain the origin of the biological diversity. Genomic information, coupled with knowledge of Earth’s history, especially the evolution of the Amazonian landscape, presents fascinating...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazonia; Biogeography; Birds; Conservation; Diversification; Rivers.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600611
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Dynamics of an Equatorial River Plume: Theory and Numerical Experiments Applied to the Congo Plume Case ArchiMer
Vic, Clement; Berger, Henrick; Treguier, Anne-marie; Couvelard, Xavier.
The Congo River has the second largest rate of flow in the world and is mainly responsible for the broad tongue of low-salinity water that is observed in the Gulf of Guinea. Despite their importance, near-equatorial river plumes have not been studied as thoroughly as midlatitude plumes and their dynamics remain unclear. Using both theory and idealized numerical experiments that reproduce the major characteristics of the region, the authors have investigated the dynamics of the Congo River plume and examine its sensitivity to different forcing mechanisms. It is found that near-equatorial plumes are more likely to be surface trapped than midlatitude plumes, and the importance of the effect in describing the strong offshore extent of the low-salinity tongue...
Tipo: Text Palavras-chave: Geographic location; Entity; Rivers; Circulation; Dynamics; Coastal flows; Density currents; Eddies; Nonlinear dynamics; Topographic effects.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00187/29850/28298.pdf
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Effects of the flood pulse on the isotopic composition (δ13C and δ15N) of the particulate organic carbon (POC) in the upper Paraná floodplain Biological Sciences
Fiori, Leandro Fabrício; Sacramento, Patricia Almeida; Corbetta, Daiany de Fátima; Pereira, Lucas Milani; Benedito, Evanilde.
The particulate organic carbon (POC) is an important energy source present in the food chain of detritivorous fish. Considering its importance, this study aimed to investigate the effect of the flood pulse on the composition of the POC in a neotropical floodplain. For this, we analyzed the seasonal variations of the carbon isotopic composition (δ13C) and nitrogen (δ15N) in two different hydrological periods in the years 2000 and 2009. Sampling of potential sources of primary producers, as well as the POC, was held in different subsystems of the floodplain of the upper Paraná river (subsystems of the rivers Parana, Baía and Ivinheima). In 2000, there were significant differences on isotopic signature (δ13C) of the POC, unlike what was seen in 2009, where...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.05.02.00-1 potamophase; Limnophase; Rivers; Water level; Wetlands Ecologia de Ecossistemas.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/20336
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El Islote El Palmar, resultado de una evolución a largo plazo de la distribución del drenaje entre los Ríos Daule y Babahoyo en la Cuenca del Guayas OceanDocs
Dumont, J.F.; Santana, E.; Soledispa, B.; King, A..
Se analizó la forma de la red de drenaje de la parte sur de la Cuenca del Guayas, desde Quevedo al norte hasta la confluencia de los ríos Daule y Babahoyo al sur. La idea de que la distribución del drenaje en la Cuenca del Guayas es variable y puede tener un efecto sobre la repartición de los caudales respectivos de los ríos Daule y Babahoyo, es basada en dos elementos, uno geológico y el otro histórico.
Tipo: Journal Contribution Palavras-chave: Coastal morphology; Sedimentation; River basins; Rivers; Rivers; Sedimentation; River basins; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_6926; Http://aims.fao.org/aos/agrovoc/c_6613.
Ano: 2007 URL: http://hdl.handle.net/1834/2366
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Environmental and social values of river water: examples from the Menik Ganga, Sri Lanka. AgEcon
Dissanayake, Priyanka; Smakhtin, Vladimir U..
Many decisions on water allocation in river basins are made on economic grounds. Environmental and social benefits of water should also be considered in river basin management, and attempts should be made to value them similarly. This is not a straightforward task and very few studies have directly addressed this issue to date. In this paper, the Menik Ganga (River) in southern Sri Lanka is used as a case study to attempt and evaluate the costs and benefits of environmental water allocations, referred to as ‘environmental flows’ (EF). In this study, a broad definition of EF is used: the components of EF evaluated include the requirements of the religious festival, the requirements of the Yala National Park, the requirements of the Pilinnawa Coastal Wetland...
Tipo: Working or Discussion Paper Palavras-chave: Rivers; Ecosystems; Wetlands; Wildlife; Fisheries; Water allocation; Water requirements; Case studies; Economic evaluation; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Resource /Energy Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/91876
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Environmental Hf–Nd isotopic decoupling in World river clays ArchiMer
Bayon, Germain; Skonieczny, Charlotte; Delvigne, Camille; Toucanne, Samuel; Bermell, Sylvain; Ponzevera, Emmanuel; Andre, Luc.
The hafnium and neodymium radiogenic isotope systems behave differently during Earth surface processes, causing a wide dispersion of Hf and Nd isotopic compositions in sediments and other sedimentary rocks. The decoupling between Hf and Nd isotopes in sediments is generally attributed to a combination of preferential sorting of zircon during sediment transport and incongruent weathering processes on continents. In this study, we analysed size-fractions of sediment samples collected near the mouth of 53 rivers worldwide to better understand the factors controlling the distribution of Hf and Nd isotopes in sediments. Our results for rivers draining old cratonic areas and volcanic provinces demonstrate that both granite and basalt weathering can lead to...
Tipo: Text Palavras-chave: Hafnium isotopes; Neodymium; Rivers; Clays; Weathering; Climate.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00310/42094/41479.pdf
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Estimating cyclopoid copepod species richness and geographical distribution (Crustacea) across a large hydrographical basin: comparing between samples from water column (plankton) and macrophyte stands Rev. Bras. Zool.
Perbiche-Neves,Gilmar; Rocha,Carlos E.F. da; Nogueira,Marcos G..
Species richness and geographical distribution of Cyclopoida freshwater copepods were analyzed along the "La Plata" River basin. Ninety-six samples were taken from 24 sampling sites, twelve sites for zooplankton in open waters and twelve sites for zooplankton within macrophyte stands, including reservoirs and lotic stretches. There were, on average, three species per sample in the plankton compared to five per sample in macrophytes. Six species were exclusive to the plankton, 10 to macrophyte stands, and 17 were common to both. Only one species was found in similar proportions in plankton and macrophytes, while five species were widely found in plankton, and thirteen in macrophytes. The distinction between species from open water zooplankton and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: La Plata River basin; Reservoirs; Rivers; Zooplankton.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000300005
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