chironomidae (insecta: diptera) of different habitats and microhabitats of the vacacai-mirim river microbasin, southern brazil
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ID: 252878
2013
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Abstract
The Chironomidae family is one of the main groups of aquatic insects present in streams. This work aimed to investigate the influences of anthropogenic pressures and substrate types on chironomid community composition and structure. Chironomid larvae were collected during the summer of 2007 at four sites along the Vacacaí-Mirim River microbasin, chosen based on the different available benthic substrates. The organisms were identified in the laboratory at the genus level, and the density, the rarefied taxonomic richness and the Shannon diversity index were calculated. The faunal structure was subjected to an ANOVA to compare the metrics among sites and substrates. The community composition of the sites was subjected to a multivariate statistical analysis. Differences in the composition, richness, density, and diversity were observed among the sites due to differences in the levels of nutrients and solids generated by the presence of crops close to water bodies. Samples collected from sandy substrates exhibited a lower density and taxonomic richness because sand is a poorer substrate than the others that were sampled. In organic or mixed substrates with higher energy availability and better shelter conditions, the observed densities were higher. The physical and chemical conditions and the morphometric characteristics of the sites were more influential than the substrates.
| Reference Key |
konig2013anaischironomidae
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|---|---|
| Authors | ;RODRIGO KONIG;SANDRO SANTOS |
| Journal | hypertension (dallas, tex : 1979) |
| Year | 2013 |
| DOI |
10.1590/S0001-37652013000300010
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| URL | |
| Keywords | Keywords not found |
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