Detalhes bibliográficos
| Ano de defesa: |
2013 |
| Autor(a) principal: |
Silveira, Allan Valle Toledo da
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| Orientador(a): |
Oliveira, Leandro Gonçalves
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| Banca de defesa: |
Oliveira, Leandro Gonçalves,
Nogueira, Ina de Souza,
Castro, Selma Simões de,
Nessimian, Jorge Luiz,
Gonçalves Júnior, José Francisco |
| Tipo de documento: |
Tese
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| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Goiás
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| Programa de Pós-Graduação: |
Programa de Pós-graduação em Ciências Ambientais (PRPG)
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| Departamento: |
Pró-Reitoria de Pós-graduação (PRPG)
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| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://repositorio.bc.ufg.br/tede/handle/tede/3249
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Resumo: |
This thesis evaluated the variables that influence the distribution of aquatic insects, along different spatial scales, aiming to establish a biologic index of water quality based on these organisms. The study area was the Rio dos Bois watershed, one of the most important from Goiás State, due to its vocation for agricultural and cattle production. Thus, the community of aquatic insects occurring in forty two streams was sampled, as well as a series of water physicochemical variables. Surrounding the streams (up to a distance of 200 m), and along the watershed above the sampling units, percentages of land use (agriculture, pasture and native vegetation) were estimated based on LandSat 5/TM satellite images from July 2012. The main results showed that (1) smaller spatial scales seem to provide better estimates of water quality and aquatic insects community than the watershed level scale, being recommended to use habitat integrity indexes (HII); (2) the variance partition held to define the contribution of the spatial processes and environmental variables on the community structure of aquatic insects did not present statistically significant values to corroborate none of the two sets of predictors and (3) only four from the 26 biodiversity metrics studied were enough to compose a multimetric index for the watershed, (% Plecoptera, Ephemeroptera richness, EPT richness and the BMWP/ASPT index). (4) Based on this index, it was possible to classify the streams from the study area as very disturbed (41%), with intermediate impacts (46%) and minimally disturbed (13%). This study may contribute to future studies of biomonitoring and conservation of water resources in the Goiás State and Brazil. |
