Distribuição de Trichoptera Kirby, 1813 (Insecta) em riachos de Mata Atlântica da Serra de Paranapiacaba, Estado de São Paulo, Brasil. / Distribution of Trichoptera Kirby, 1813 (Insecta) in Atlantic Rainforest streams of Serra de Paranapiacaba, São Paulo State, Brazil.

AUTOR(ES)

Elisa Yokoyama

DATA DE PUBLICAÇÃO

2008

RESUMO

Data on the fauna of immature stages of Trichoptera were gathered for sites within and outside the range of conservation units in Serra de Paranapiacaba, State of São Paulo, aiming to test the effects of environmental variables and degree of environmental integrity on faunistic composition, abundance and richness of larvae. The relationship between abundance and occupancy of Trichoptera genera was also tested. Sampling was conducted in 1st-4th order streams, in a total of 33 stations. 25 stones with a standardized size (18-20cm along the longest axis) were sampled with a net (0,250mm mesh size). Ordination and cluster analysis failed to detect any faunal structure of Trichoptera. Among the environmental variables, the environmental integrity scores, physico-chemical factors and location (inside and outside of the conservation unit) were non significant in explaining the distribution, whereas discharge and geographic distance were significant, although with little explanatory power. No significant differences were found for abundance and richness (observed and standardized) between sites inside and outside of the conservation units. The absence of faunal structure may have resulted from peaks of rain recorded just before and during sampling days, which could have homogeneized the fauna, and due to differences in the degree of anthropic impacts found for sites outside of the conservation units, which may not have been severe enough to cause the differentiation of faunal assemblages. A positive relationship between relative abundance and distribution of genera was found, in accordance with various macroecology studies.

ASSUNTO(S)

mata atlântica. relação abundância-distribuição lotic environments ambientes lóticos aquatic insects insetos aquáticos abundance-distribution relationship. neotropical region região neotropical

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