%0 Journal Article
%T A sazonalidade ambiental afeta a composi  o faun赤stica de Ephemeroptera e Trichoptera em um riacho de Cerrado do Sudeste do Brasil? / Does environmental seasonality affect the faunal composition of Ephemeroptera and Trichoptera in a Cerrado stream from southeastern
%A Elisa Yokoyama
%A Gabriel de Paula Paciencia
%A Polyanna da Conceiˋˋo Bispo
%A Leandro Gonˋalves Oliveira
%J Ambi那ncia
%D 2012
%I Universidade Estadual do Centro-Oeste
%X ResumoNo presente trabalho, dados sobre Ephemeroptera e Trichoptera (ET) de um riacho de cerrado foram analisados, com o objetivo de testar a hip車tese de que a alta sazonalidade neste bioma pode alterar a composi  o de ET entre as esta  es chuvosas e de seca. A estrutura da comunidade foi avaliada utilizando a An芍lise de Correspond那ncia Destendenciada e a An芍lise de Agrupamento (Morisita-Horn, UPGMA). Os fatores ambientais foram submetidos 角 An芍lise de Componentes Principais. Para testar a influ那ncia das vari芍veis abi車ticas sobre a fauna, foram utilizados o Procrustean Randomization Test (Protest) e o Teste de Mantel. Os fatores ambientais registrados influenciaram significativamente a fauna de ET do C車rrego do Pedregulho. A similaridade faun赤stica foi alta ao longo do ano, indicando que, apesar de a densidade flutuar em resposta 角 varia  o da precipita  o, a composi  o faun赤stica apresentou baixa variabilidade temporal. Por outro lado, foi poss赤vel constatar que o g那nero Lachlania (Ephemeroptera) ocorreu, preferencialmente, nos meses chuvosos e que a composi  o da fauna da esta  o seca variou menos do que aquela das demais esta  es. Portanto, a sazonalidade ambiental afetou parcialmente a composi  o da fauna de ET do C車rrego do Pedregulho.AbstractIn this paper, data on the fauna of Ephemeroptera and Trichoptera (ET) from a Cerrado stream was analysed in order to test the hypothesis that the high seasonality of this biome can influence the composition of ET between the wet and dry seasons. The community structure was evaluated using Detrended Correspondence Analysis and Cluster Analysis (Morisita Horn-UPGMA). Environmental factors were analyzed using the Principal Components Analysis. In order to test the effect of abiotic variables on the fauna, It was applied the Procrustean Randomization Test (Protest) and Mantel Test. The environmental factors recorded for this study had a significant effect on the ET fauna from C車rrego do Pedregulho. Faunal similarity was high throughout the year, indicating that although there was density of fluctuation, due to rainfall variation, the faunal composition showed little temporal variability. On the other hand, it was possible to observe that the genus Lachlania (Ephemeroptera) occurred preferably during the rainy months and that the faunal composition during the dry season was less variable than those from other seasons. Therefore, environmental seasonality had a partial effect on the faunal composition of ET from C車rrego do Pedregulho.
%K insetos aqu芍ticos
%K riachos
%K an芍lise multivariada
%K Procrustean Randomization Test (Protest)
%K Teste de Mantel.
%U http://revistas.unicentro.br/index.php/ambiencia/article/view/1324/1536