Low diversity of zooplankton in the river mouth of an eutrophic reservoir (SP, Brazil): pollution effects?
| Autor: | Gilmar Perbiche-Neves, Edmir Daniel Carvalho, Danilo Augusto de Oliveira Naliato, Rosângela Lopes Zaganini |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp) |
| Jazyk: | portugalština |
| Rok vydání: | 2011 |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2013-09-27T16:24:23Z (GMT). No. of bitstreams: 1 ZOORECZOOR14901006179.pdf: 1380519 bytes, checksum: f8118050429299013eec2af8f2dd9fef (MD5) Previous issue date: 2011-01-01 Made available in DSpace on 2013-09-30T19:25:13Z (GMT). No. of bitstreams: 1 ZOORECZOOR14901006179.pdf: 1380519 bytes, checksum: f8118050429299013eec2af8f2dd9fef (MD5) Previous issue date: 2011-01-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T15:34:59Z No. of bitstreams: 1 ZOORECZOOR14901006179.pdf: 1380519 bytes, checksum: f8118050429299013eec2af8f2dd9fef (MD5) Made available in DSpace on 2014-05-20T15:34:59Z (GMT). No. of bitstreams: 1 ZOORECZOOR14901006179.pdf: 1380519 bytes, checksum: f8118050429299013eec2af8f2dd9fef (MD5) Previous issue date: 2011-01-01 The Tiete River (in São Paulo state) receives most of the efuents of the metropolitan region of São Paulo; and the Barra Bonita reservoir, 200 km distant downstream, receives and recycle most of that pollution load. This work studied the ecological features of the zooplankton (Rotifera, Cladocera and Copepoda) sampled in a point of Tiete River's mouth. Monthly samples were collected, from April, 2001 to February, 2008. The hypothesis currently tested was that the composition and availability of zooplankton were similar to the others reservoir regions (middle and lacustrine sensu Thornton) and to other reservoirs of the Upper Parana River basin, supporting the idea that these organisms manage to stand the strong pollution. The reservoir shows a typical variation of accumulation, with wide variation of seasonal altimetric grading and large fow in the rainy pe- riod, infuenced by the rainfall regime, with efects upon zooplankton assemblage. As a whole, 24 species were registered: 12 Rotifera, 8 Cladocera and 4 Copepoda. Data showed that the hypothesis formulated must be rejected, due the variation trends of zooplankton environmental attributes not being regular, with relatively high abundance values for a lotic environment in specifc months, and low organism abundance or absence in other months. Those facts can be attributed to pollution efects conducting to low dissolved oxygen concentration (> 4mg.l-1) in some months, which causes the zooplankton community to be very much afected. [K] Biologa, Doutoranda do Departamento de Ciencias Biologicas Universidade Estadual Paulista de Mesquita Filho (UNESP), São Paulo, SP, Brazil Biologa, Doutoranda do Departamento de Ciencias Biologicas Universidade Estadual Paulista de Mesquita Filho (UNESP), São Paulo, SP, Brazil |
| Databáze: | OpenAIRE |
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