Indicadores ecológicos multi-escala para avaliação de comunidades de macroinvertebrados aquáticos na bacia do rio dos bois-Go
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2013-04-05
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Universidade Federal de Goiás
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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.
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SILVEIRA, Allan Valle Toledo da. Indicadores ecológicos multi-escala para avaliação de comunidades de macroinvertebrados aquáticos na bacia do rio dos bois-Go. 2013. 73 f.- Tese (Doutorado em Ciências Ambientais) - Universidade Federal de Goiás, Goiânia, 2013.