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| Registros recuperados: 55 | |
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| Pradhan, Deepa; Ancev, Tihomir; Drynan, Ross G.; Harris, Michael. |
| Communal water storage reservoirs (embungs) that serve many villages in West Timor, Indonesia, by providing water during the prolonged annual dry season are experiencing severe sedimentation problems. Sedimentation of reservoirs progressively reduces their water storage capacity and the benefits to community. This paper investigates four alternative strategies for managing the sedimentation of a typical village embung: (1) current management (a “no management” situation), (2) soil conservation in the embung catchment, (3) periodic sediment removal and (4) both soil conservation and sediment removal. Without periodic sediment removal, an embung has a finite life dependent on the rate of sedimentation. The results indicate that periodic cleaning is clearly... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Management; Reservoir; Sediment; Water use; West Timor. |
| Ano: 2009 |
URL: http://purl.umn.edu/48052 |
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| Sousa,E de; Costa,T P; Werther,K; Durigon,EL; Araujo,J de; Ferreira,CS; Pinto,AA. |
| Although the natural reservoirs of the avian influenza (AI) virus have been extensively studied in many countries, there is a clear lack of information on this subject in South America, particularly in Brazil. The objective of this study was to conduct a serological survey for H5, H7 and H9 antibodies to AI-subtype viruses in wild birds in the state of São Paulo , Brazil. Serum samples were tested using the hemagglutination-inhibition assay. Out of the 31 wild birds sampled between January and December of 2006, seven (22.58%), were seropositive for H5, H7 and H9; four (12.90%) were seropositive for H5 and H7; 13 (41.94%), were seropositive only for H7; three (9.7%), were seropositive only for H9; and four (12.90%) were negative for all three hemagglutinin... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avian influenza virus; Brazil; Hemagglutination inhibition; Reservoir; Wild bird. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000300001 |
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| Silva,JSA; Mota,RA; Vilela,SMO; Doretto Júnior,L; Pinheiro Júnior,JW; Silva,LBG. |
| Reservoir competence for the Newcastle Disease virus (NDV) was evaluated in sparrows (Passer domesticus, Linnaeus 1758) captured on a commercial poultry farm and a chicken hatchery in the State of Pernambuco, Northeastern Brazil. A total number of 103 birds collected from a poultry farm (24/103) and a chicken hatchery (79/103) were examined. Hemagglutination inhibition tests, isolation, and viral characterization were performed in all samples collected from each bird. Titers ranging from 1:2 to 1:64 were detectable in 10.68% of sparrows, but positive serology and viral isolation were obtained only from sparrows captured at the hatchery. Hemagglutination activity was inhibited by anti-avian paramyxovirus serotype 1 (APMV-1) serum, and this sample showed an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Newcastle Disease; Sparrows; Reservoir; Isolation; Serology (HI); Poultry farm; Lentogenic strains (B1). |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000200009 |
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| Vono,Volney; Silva,Luiz Gustavo M.; Maia,Bruno P.; Godinho,Hugo P.. |
| The reproductive activity parameters of the teleosts Pimelodus maculatus Lacépède, 1803, Leporinus amblyrhynchus Garavello & Britski, 1987 and Schizodon nasutus Kner, 1859 was evaluated at a newly formed reservoir in the Araguari River, Paraná River basin, Southeast Brazil. The fishes were captured by gill nets bimonthly from November 1997 to November 1998 at three sampling stations. The stages of gonad development were identified macroscopically in the field and then confirmed by histological analysis in the laboratory. The females of all species reached larger standard length than the males. Pimelodus maculatus in reproductive activity were captured only in November, 1997 and January, 1998 whereas L. amblyrhynchus and S. nasutus were in activity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish reproduction; Reservoir; Dam effects. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300020 |
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| Duarte,Silvana; Caetano,Carla de Brito; Vicentini,Rafaela Nascimento; Araújo,Francisco Gerson. |
| The catfish Trachelyopterus striatulus Steindachner, 1877 is a very abundant fish species in reservoirs in Southeast Brazil, and its relative abundance seems to be increasing in several lentic environments. Despite of being a very common species, few information is available on its distribution and other aspects of ecology. The Lajes reservoir (22º42'-22º50'S e 43º53'-44º05'W) is the largest manmade lake for hydropower purposes in Rio de Janeiro State, where this species rank among the top abundant fishes, both in number and in biomass. Its relative abundance were compared in three zones of the reservoir (upper, central and lower), based on a standardized program, during three annual periods (monthly sampling in 1994 and bi-monthly sampling in 1996 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Auchenipteridae; Distribution; Abundance; Environmental parameters; Lajes; Reservoir. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300029 |
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| Araújo,Francisco Gerson; Duarte,Silvana; Goldberg,Rubens Sterental; Fichberg,Liana. |
| Parauchenipterus striatulus is a representative of the freshwater catfish with wide distribution in the South America region. Despite of being a very abundant fish in rivers and reservoirs of this region, little is known about its biology and ecology. In Ribeirão das Lajes reservoir (22º42'S - 22º50'S, 43º53'- 44º05' W, Rio de Janeiro), the Rio de Janeiro state's largest hydroelectric reservoir, this species is very abundant, representing about 40% of the total experimental fish catches using gill nets. This paper aims to assess aspects of the reproductive cycle of this species describing the gonadal stages, gonadosomatic index, weight-length relationship and condition factor. Fish sampling were carried out bi-monthly, between April 1996 and May 1997. Gill... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Auchenipteridae; Length-weight relationship; Reproduction; Condition factor; Gonadosomatic index; Reservoir. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000400016 |
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| Duarte,Silvana; Araújo,Francisco Gerson. |
| The armored catfish Loricariichthys spixii (Steindachner, 1882) is the most abundant member of the Loricariidae family in the Lajes reservoir (22º42'-22º50'S 43º53' -44º05'W), the largest dam in the State of Rio de Janeiro State, but little is known about its biology and life cycle. A standardized fish sampling program in three zones of the reservoir (lower, middle and upper reaches), during three annual cycles: monthly in 1994/1996 and bi-monthly in 1997 was conducted out aiming to assess and add knowledge of the population structure of this species. Fishes were caught using gill nets (50 m long, 3 m depth and 25 to 45 mm meshes), amounting 160 samples. Water temperature, pH and transparency were registered at each sample to correlate with fish abundance.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lajes; Reservoir; Loricariidae; Distribution; Environmental parameters. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000200017 |
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| Cunha,Elane Domênica de Souza; Cunha,Alan Cavalcanti da; Silveira Jr,Arialdo Martins da; Faustino,Silvia Maria Mathes. |
| During the various hydrological periods in 2011, we studied the phytoplankton along an 87-km stretch of the Araguari and Falsino rivers, which are located in the eastern Brazilian Amazon, in the state of Amapá, Brazil, the most ecologically preserved state in the country. In the study area, the aquatic ecosystem is under pressure from human activities such as, mining, hydroelectric power generation and urbanization, which contrast with the surrounding areas that are designated for biodiversity conservation. The aim of this study was to characterize the composition, frequency and richness of algae species and also to identify spatial-temporal patterns of taxa distribution. During the study period, we identified 185 taxa (136 species in 49 genera). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae; Amapá; Floristic survey; Reservoir; River. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200011 |
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| Jorge, Monica Bueno; Vilela, Maria José Alencar; Suarez, Yzel Rondon; Lima Junior, Sidnei Eduardo. |
| Changes in diet of Laetacara araguaiae Ottoni and Costa, 2009 were evaluated in the Sucuriú River (Upper Paraná basin, Brazil) in an area with a small hydroelectric power plant, both before and after the formation of the reservoir, in order to answer: Did the construction of the reservoir affected the diet of this species? The results showed greater change of diet composition in the upstream section of the reservoir. It was observed that before the formation of the reservoir and the first year after, the individuals from upstream section formed a group characterized by an insectivorous diet. With the dam construction and habitat change we observed that aquatic plant material, sediment, and algae predominated in the diet. These results show the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.00.00.00-6 aquatic ecology; Environmental impacts; Laetacara araguaiae; Reservoir; Upper Paraná River; Brazil. Ecologia. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/43880 |
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| Fonseca, Iraúza Arroteia; UEM; Siqueira, Natália Silveira; UEM; Rodrigues, Liliana; UEM. |
| Este trabalho objetivou analisar a riqueza e a abundância de algas perifíticas nos rios do Corvo e Guairacá, tributários do reservatório de Rosana, quando da instalação de tanques-rede. Acreditava-se que o ponto logo à frente dos tanques-rede apresentaria menor riqueza e abundância de algas e que o reservatório influenciaria as estações a jusante dos tanques. Para isso, coletas foram realizadas a montante, em frente e a jusante da instalação de tanques-rede. Independentemente do ambiente, a estação que apresentou maior riqueza foi 1.000 m a montante. Diminuição na riqueza foi verificada nas estações 500 m a montante e 500 m a jusante. Quanto à densidade, em frente aos tanques, observou-se maior abundância, seguida pela estação a 1.000 m a jusante. Já, nas... |
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Palavras-chave: Periphytic algae; Environmental monitoring; Reservoir; Net cage 2.00.00.00-6 Ciências Biológicas perifíton; Monitoramento ambiental; Aqüicultura; Estrutura de comunidade Ecologia. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2523 |
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| Bessa, Gisele Fernandes; Universidade Federal do Tocantins; Vieira, Ludgero Cardoso Galli; Universidade de Brasília; Bini, Luis Mauricio; Universidade Federal do Goiás; Reis, Deusiano Florêncio dos; Universidade Federal do Tocantins; Morais, Paula Benevides de; Universidade Federal do Tocantins. |
| The goal of this study was to evaluate the concordance amongst three zooplankton groups (Rotifera, Cladocera, and Copepoda) and between the zooplankton groups and the environmental variables in the Luis Eduardo Magalhães reservoir, in the Mid-Tocantins River, Tocantins State, Brazil. Concordance patterns were found in relation to environmental variables, cladocerans, and rotifers, although values were relatively low. These results indicate that one should be cautious about the use of indicative taxonomic groups to detect environmental changes, where divergent results annul extrapolation possibilities and indicate the existence of distinct environmental factors controlling different groups. |
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Palavras-chave: 2.05.02.00-1 Concordance; Reservoir; Rotífera; Cladocera; Copepoda 2.05.02.00-1 Concordance; Reservoir; Rotífera; Cladocera; Copepoda. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7336 |
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| Chaves, Francisco Ítalo Barbosa; Universidade Federal do Ceará/Aluno de doutorado; Lima, Paulo de Freitas; Universidade Federal do Ceará; Leitão, Renato Carrhá; Embrapa Agroindústria Tropical; Paulino, Walt Disney; Companhia de Gestão de Recursos Hídricos do Estado do Ceará; Santaella, Sandra Tédde; Universidade Federal do Ceará. |
| This study evaluated the trophic conditions of the reservoir located in the urban perimeter of the town General Sampaio, semiarid region of the Ceará State, Brazil and its relationship with seasonal variation in rainfall between 2010 and 2011. It was obtained data for Secchi disk transparency, total phosphorus, and chlorophyll a to calculate the Trophic State Index (TSI), as well as rainfall data. The Trophic State Index (TSI) proposed by Carlson (1977) and modified by Toledo Junior (1990) was used to test the influence of the seasonal variation in rainfall on hydrological variables and on trophic conditions of the reservoir in 2010 and 2011. There was seasonal variability in variables analyzed between climatic periods (rainy and dry) and trophic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.05.02.00-1 Brazilian semiarid; Reservoir; Trophic state index ECOLOGIA DE ECOSSISTEMAS. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/18261 |
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| OLIVEIRA,FÁBIO H.P.C. DE; ARA,ANDRÉ L.S. CAPELA E; MOREIRA,CESAR H.P.; LIRA,OSMAN O.; PADILHA,MARIA DO ROSÁRIO F.; SHINOHARA,NEIDE K.S.. |
| This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one- way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm3.L–1) occurred in the dry season,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coliforms; Cyanobacteria; Reservoir; Trophic state. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401863 |
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| Registros recuperados: 55 | |
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