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Registros recuperados: 17 | |
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Suriani,Ana L.; França,Roberta S.; Rocha,Odete. |
Este trabalho analisa a composição de espécies, a densidade e a distribuição espacial e temporal da malacofauna bentônica em três represas do médio rio Tietê. As coletas foram realizadas em dois períodos climáticos, o chuvoso em novembro de 2002 e o seco em agosto de 2003, amostrando-se três porções em cada represa (superior, mediana e barragem) e seguindo uma varredura com seis pontos amostrais em cada transecto. Os dados limnológicos obtidos evidenciaram que as represas do médio rio Tietê encontram-se eutrofizadas com elevadas concentrações de nutrientes (totais e dissolvidos). Foram registradas oito espécies de moluscos sendo seis nativas e duas exóticas. Destas, a espécie dominante foi o molusco exótico e invasor Melanoides tuberculata (Müller, 1774),... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversidade; Ecologia de reservatórios; Moluscos invasores. |
Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000100003 |
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Fracácio,Renata; Verani,Nelsy Fenerich; Espíndola,Evaldo Luiz Gaeta; Rocha,Odete; Rigolin-Sá,Odila; Andrade,Cássio Arilson. |
The objective of this work was to assess the toxicity of sediment samples from six cascade reservoirs in Tietê river system, in São Paulo State, Brazil, through chronic-partial toxicity bioassays with Danio rerio larvae as test-organisms. Histology of gills and biometric measurements were used to determine the existence of toxicity problems. The alterations on gill morphology here detected were considered of first stage (hyperplasia, lamellar junction and excess of mucous cells) in the first reservoirs and very slight in the last ones. The biometric analysis pointed to inadequate conditions for the growth of the test-organisms when exposed to the sediment of the rivers and upstream reservoirs and also indicated an improvement of environmental conditions... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gill morphology; Sediment toxicity; Danio rerio; Tietê reservoirs; Pollution. |
Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400023 |
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Pedrozo,Catarina da Silva; Rocha,Odete. |
The purpose of the present work was to evaluate the environmental quality of Marcelino, Pinguela, Peixoto, Palmital, Malvas and Do Passo lakes, interconnected by canals and located in the district of Osório, RS. In this context, 29 physical and chemical variables were analyzed with sampling carried out in January, May, July and October 1997 to verify the environmental quality of the system and the existence of a gradient of quality. Canonical Analysis was applied to the data of all environmental variables measured, and showed that the lakes had different characteristics as a consequence of the organic pollution received. Marcelino lake received continuous input of organic matter from the sewage treatment works in the town of Osório, whereas Peixoto,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Castal lakes; Water quality; Environmental variables; Limnological characteristics. |
Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000400013 |
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Silva,Lidiane Cristina da; Leone,Isabela Carnielli; Santos-Wisniewski,Maria José dos; Peret,Alberto Carvalho; Rocha,Odete. |
Dinoflagellates of the genus Ceratium are chiefly marine but there are rare occurrences in freshwater. In this study we analyze the invasion and progressive establishment of Ceratium furcoides, an exotic species, in the Furnas Reservoir. Samples were taken at 36 points in the reservoir, during the months of March, June, September and December, 2007. Measurements of some physical and chemical variables were simultaneously performed at each site. The occurrence of C. furcoides was registered at 20 sites, with densities varying between 0.57 and 28,564,913.0 ind.m-3. Blooms of this species were recorded in points which were classified as mesotrophic, coinciding with the places receiving high amounts of untreated domestic sewage. C. furcoides density was... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Invasive species; Algal blooms; Eutrophication; Reservoir ecology. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000200010 |
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Elmoor-Loureiro,Lourdes M.A.; Santos-Wisniewski,Maria J. dos; Rocha,Odete. |
The Neotropical species Parvalona parva (Daday, 1905) was previously reported only from two localities (Northern Argentina and Lençóis Maranhenses, Brazil). In the present paper, seven new records of P. parva from Brazil are presented. The specimens were collected from small waterbodies located in the Federal District and the states of São Paulo, Pará, and Pernambuco. These new records suggest that this species is not as rare as previously believed. The male, sexual female, and the lateral head pores of parthenogenetic females are described and illustrated for the first time. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aloninae; Cladoceran; South America; Systematic. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000200022 |
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Souza,Jussara E. de; Fragoso-Moura,Evelise N.; Fenerich-Verani,Nelsy; Rocha,Odete; Verani,José R.. |
The structure of Cichla kelberi population was characterized regarding the sex ratio, total length composition and some reproductive characteristics. The specimens were collected in two periods, from November 2002 to November 2003 and from December 2004 to May 2006. The sex ratio was significantly different than 1:1. The total length varied from 3.4 to 40.1 cm, with individuals in the shortest length classes occurring throughout the year, but with greater incidence in the warmer periods. Females and males reached similar lengths and there was no difference between the sexes regarding the length-weight relationship. The estimated values of condition factor were near the central value of 1.0 and decreased during the cooler months, coinciding with periods of... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Condition factor; Fecundity; Length-weight relationship; Reproduction. |
Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200007 |
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Pamplin,Paulo Augusto Zaitune; Rocha,Odete; Marchese,Mercedes. |
A riqueza de espécies de Oligochaeta foi investigada em duas represas construídas no curso do rio Tietê. Em cada represa foram obtidas 360 amostras de sedimento em 90 pontos de amostragem, utilizando-se uma draga Van Veen (378cm²), nos meses de janeiro, abril, julho e outubro de 2001. No total foram examinados 12.826 exemplares de oligoquetos pertencentes a 20 espécies, 10 gêneros e 4 famílias. Naididae e Dero foram a família e o gênero com maiores riquezas de espécies, com 14 e 9 espécies, respectivamente. Do total de espécies identificadas, 6 estiveram presentes em ambas represas, sendo Branchiura sowerbyi (Tubificidae) a espécie mais abundante nestes ambientes. A análise das amostras revelou que a maioria das espécies de oligoquetos é rara e de... |
Tipo: Info:eu-repo/semantics/article |
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Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032005000100007 |
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Santos-Wisniewski,Maria José; Rocha,Odete; Guntzel,Adriana Maria; Matsumura-Tundisi,Takako. |
The Chydorus and Pseudochydorus genera are widely distributed around the world. Some species of Chydorus are among the commonest anomopods and Pseudochydorus globosus, the only species of the genus, is believed cosmopolitan. This study was part of the project " Zooplanktonic biodiversity and state of degradation of continental water ecosystems in São Paulo State" , itself a part of the FAPESP/BIOTA Program - The Virtual Institute of Biodiversity (www.biotasp.org.br), the aim being to make an inventory and analyze the distribution of species of the genera Chydorus and Pseudochydorus in São Paulo State, Brazil. In total, 373 samples were collected from 223 water bodies in the Water Resources Management Units of São Paulo State, between 9/9/1999 and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anomopoda; Chydoridae; Littoral region; Biodiversity. |
Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000100007 |
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Negreiros,Natalia F.; Santos,Renata M. dos; Oliveira,Laira Lúcia Damasceno de; Santos-Wisniewski,Maria J. dos; Rocha,Odete. |
Populations of Synchaeta jollyae (Shiel & Koste, 1993) (Rotifera), a species recently recorded for the first time in Brazil and South America, were analyzed in reservoirs in Southeast Brazil. Sampling was carried out monthly from August 2006 to July 2007 at Furnas Reservoir in the Rio Grande basin, state of Minas Gerais, and in four cascade reservoirs in the Tietê River basin (Barra Bonita, Bariri, Ibitinga and Nova Avanhandava) state of São Paulo, in June and September 2008 and in January and May 2009. Synchaeta jollyae occurred in most samples and periods. From the results obtained it is evident that S. jollyae occurs in water bodies of varied trophic status but reaches larger populations in eutrophic water bodies and during lower temperature... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zooplankton; Rotifers; Furnas Reservoir; Tietê River. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000200007 |
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Negreiros,Natalia Felix; Santos-Wisniewski,Maria José dos; Santos,Renata Martins dos; Rocha,Odete. |
Seasonal fluctuations in the dynamics of the plankton rotifer populations in an oligo-mesotrophic branch of a tropical reservoir were analyzed with respect to the possible influence of environmental conditions (physical, chemical and biological), with emphasis on biological interactions. Samples were taken monthly from August 2006 to July 2007. The well-defined climatic seasons were reflected in variations of the physical and chemical properties of the water. The zooplankton community consisted mainly of Rotifera, Cladocera and Copepoda, with occasional representatives of Chaoborus brasiliensis (Diptera), Ostracoda, Protozoa and Turbellaria. Rotifera was the dominant group in zooplankton community in 5 of the 12 months of the study and were represented by... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rotifera; Furnas reservoir; Intra-zooplankton predation; Inter-specific competition. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000400023 |
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Registros recuperados: 17 | |
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