Título:	Influence of water chemistry and environmental degradation on macroinvertebrate assemblages in a river basis in south-east Brazil.
Autoria:	BUSS, D. F. BAPTISTA, D. F. SILVA, M. S. G. M. e NESSIMIAN, J. L. DORVILLÉ, L. F. M.
Afiliação:	Daniel F. BUSS, Laboratorio de Avaliação e Promoção da Saude Ambiental, Deptartamento de Biologia, IOC, FIOCRUZ; Darcílio F. BAPTISTA, Laboratorio de Avaliação e Promoção da Saude Ambiental, Deptartamento de Biologia, IOC, FIOCRUZ; MARIANA SILVEIRA GUERRA MOURA E SIL, CNPMA; Jorge L. Nessimian, Laboratorio de Entomologia, Depto. de Zoologia, CCS, UFRJ, Ilha do Fundão, Rio de Janeiro, RJ; Lu?s F. M. Dorville, Laboratorio de Entomologia, Depto. de Zoologia, CCS, UFRJ, Ilha do Fundão, Rio de Janeiro, RJ.
Ano de publicação:	2002
Referência:	Hydrobiologia, The Hague, v. 481, p. 125-136, 2002.
Conteúdo:	Seven sites of the Guapimirim river basin were studied during three sampling periods based on the rain regime: end of wet season (May 1998), dry season (August 1998), and wet season (January 1999). Four substrates were collected at each site: sand, stony substrates, litter in pool areas and litter in riffle areas. Relationships between macroinvertebrate assemblages, water chemistry variables and environmental degradation were examined using canonical correspondence analysis (CCA). According to CCA, concentrations of dissolved oxygen and chloride, and the environmental degradation, measured by the Riparian Channel Environment index, exhibited the strongest relationship to macroinvertebrate assemblages. Overall, the loss of community diversity measured by the Shannon Index along the degradation gradient was observed. Some taxa were shown to be sensitive to water pollution, especially among Plecoptera, Trichoptera, Coleoptera and some Ephemeroptera, while others such as Simuliidae, Odonata and molluscs were tolerant to moderate levels of pollutants. The Chironomidae were the only group tolerant to a high level of pollutants and degradation.
Thesagro:	Impacto ambiental Poluição da água Bentos Fauna Aquática
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPMA)