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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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| Fávaro,Luís Fernando; Oliveira,Elton Celton de; Ventura,Augusto de Oliveira Brunow; Verani,Nelsy Fenerich. |
| The spatial and temporal distribution of Sphoeroides greeleyi and Sphoeroides testudineus were established from collections (biological material and environmental data) conducted on a monthly basis from May 2000 to April 2001 in intertidal areas along the north-south axis of the estuarine complex of Paranaguá, Paraná State. In addition to characterizing a north-south spatial gradient, which fluctuates seasonally, the variation in the abiotic factors made possible the division of the estuary into three regions: north, central and south. Spatially, it was found that the number of individuals declines significantly for both species in the north-south direction of the estuary. Moreover, significant differences were found in the size of individuals across the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tetraodontidae; Estuarine-residents; Closely related species; Abundance; Length structure. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200020 |
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