Abstract
Ecología Austral, 24:335-342 (2014)Studies in stream ecology are aimed at understanding the patterns of distribution of aquatic communities, trying to answer how local and regional factors influence the occurrence and persistence of species in these ecosystems. This study investigated the influence of land use on the Chironomidae community in streams in two drainage areas in southern Brazil. Chironomid larvae were collected in1st and 2nd orders. The riparian zone of streams (30 m on both sides) had its landscape analyzed using GIS techniques, and land uses classified as consistent and non-consistent. The land use influence was different between the two drainage areas. Likewise, the composition of Chironomidae community in streams was different between the two drainage areas. Among the different land uses, the community was influenced mainly by agriculture and arboreous vegetation. We conclud that the aquatic communities respond to environmental changes not only at local scale but also at broader scales, such as landscape features of the surrounding areas.
Highlights
Landscape integrity and influence on Chironomidae composition assemblages in small order streams: Studies in stream ecology are aimed at understanding the patterns of distribution of aquatic communities, trying to answer how local and regional factors influence the occurrence and persistence of species in these ecosystems
This study investigated the influence of land use on the Chironomidae community in streams in two drainage areas in southern Brazil
The land use influence was different between the two drainage areas
Summary
Este estudo foi realizado em 22 riachos localizados em duas áreas de drenagem situadas nas sub-bacias dos rios Tigre e Suzana, ambas compõem em escala maior a Bacia hidrográfica do Rio Uruguai e estão localizadas no município de Erechim-RS (Figura 1). A área de drenagem do rio Tigre possui área total de 2121 ha, com predominância de atividades antropizadas (73.7%) e cerca de apenas 26.3% de usos naturais como vegetação arbórea. A área de drenagem do rio Suzana possui uma área 2729 ha, sendo 30.9% no perímetro urbano. Caracterizados principalmente por atividades agrícolas corresponde a 64.6%, enquanto que os usos naturais, como vegetação arbórea, representam 35.4% da área
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