Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams
Abstract Streams may exhibit differences in community structure of invertebrate drift, which may be a reflex of variation in environmental factors, able to change in conditions of anthropogenic interventions. The aim of this study was to analyze the composition, diversity and abundance of insects dr...
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doaj-235fe6e26e18403a8ac66c7abd3e7ca62020-11-25T01:52:06ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1678-4375754 suppl 1525910.1590/1519-6984.03914S1519-69842015000800052Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streamsB. C. G. GimenezF. A. Lansac-TôhaJ. HigutiAbstract Streams may exhibit differences in community structure of invertebrate drift, which may be a reflex of variation in environmental factors, able to change in conditions of anthropogenic interventions. The aim of this study was to analyze the composition, diversity and abundance of insects drifting in two neotropical streams under different land use and to identify the environmental factors involved in determining such patterns. 54 taxa of aquatic insects were identified in urban and rural streams. The results indicated significant differences in species composition due to the replacement of specialist species by generalist species in the urban stream. Higher diversity of taxa was recorded in the rural stream, with high levels of dissolved oxygen and high water flow, which favored the occurrence of sensitive groups to environmental disturbances, such as Ephemeroptera, Plecoptera, Trichoptera and Coleoptera taxa, that living mainly in clean and well oxygenated waters. On the other hand, a higher density of insects drifting, especially Chironomidae, was observed in the urban stream, where high values of pH, electrical conductivity and nitrogen were observed. These larvae are able to explore a wide range of environmental conditions, owing to their great capacity for physiological adaptation. Despite observing the expected patterns, there were no significant differences between streams for the diversity and abundance of species. Thus, the species composition can be considered as the best predictor of impacts on the drifting insect community.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842015000800052&lng=en&tlng=enaquatic invertebratesurbanizationhuman impactlotic environments |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
B. C. G. Gimenez F. A. Lansac-Tôha J. Higuti |
spellingShingle |
B. C. G. Gimenez F. A. Lansac-Tôha J. Higuti Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams Brazilian Journal of Biology aquatic invertebrates urbanization human impact lotic environments |
author_facet |
B. C. G. Gimenez F. A. Lansac-Tôha J. Higuti |
author_sort |
B. C. G. Gimenez |
title |
Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams |
title_short |
Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams |
title_full |
Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams |
title_fullStr |
Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams |
title_full_unstemmed |
Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams |
title_sort |
effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams |
publisher |
Instituto Internacional de Ecologia |
series |
Brazilian Journal of Biology |
issn |
1678-4375 |
description |
Abstract Streams may exhibit differences in community structure of invertebrate drift, which may be a reflex of variation in environmental factors, able to change in conditions of anthropogenic interventions. The aim of this study was to analyze the composition, diversity and abundance of insects drifting in two neotropical streams under different land use and to identify the environmental factors involved in determining such patterns. 54 taxa of aquatic insects were identified in urban and rural streams. The results indicated significant differences in species composition due to the replacement of specialist species by generalist species in the urban stream. Higher diversity of taxa was recorded in the rural stream, with high levels of dissolved oxygen and high water flow, which favored the occurrence of sensitive groups to environmental disturbances, such as Ephemeroptera, Plecoptera, Trichoptera and Coleoptera taxa, that living mainly in clean and well oxygenated waters. On the other hand, a higher density of insects drifting, especially Chironomidae, was observed in the urban stream, where high values of pH, electrical conductivity and nitrogen were observed. These larvae are able to explore a wide range of environmental conditions, owing to their great capacity for physiological adaptation. Despite observing the expected patterns, there were no significant differences between streams for the diversity and abundance of species. Thus, the species composition can be considered as the best predictor of impacts on the drifting insect community. |
topic |
aquatic invertebrates urbanization human impact lotic environments |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842015000800052&lng=en&tlng=en |
work_keys_str_mv |
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