Stomach content analyses of Simulium perflavum Roubaud 1906 (Diptera: Simuliidae) larvae from streams in Central Amazônia, Brazil

Memórias do Instituto Oswaldo Cruz

Yamile B Alencar²  Thelma A Veiga Ludwig¹  Climéia C Soares¹  Neusa Hamada² 

[1] ,Instituto Nacional de Pesquisas da Amazônia Coordenação de Pesquisas em Entomologia

关键词: aquatic insects;    black fly;    diatoms;    microalgae;    stomach contents;    Amazônia;    Brazil;   

DOI  :  10.1590/S0074-02762001000400020

来源: SciELO

【 摘 要 】

Stomach contents of Simulium perflavum Roubaud larvae were analyzed and compared with plankton and periphyton collected in five streams, in Central Amazonia (Manaus and Presidente Figueiredo counties), in Sep./Oct.1996 (dry season) and Feb./Mar. 1997 (rainy season). A total of 1,400 last-instar larvae were dissected; the stomach contents were analyzed using different methods: fresh and after oxidation. A total of 87 taxa (algae, diatoms and rotifers) were found in the stomach contents. In each stream, qualitative samples of plankton and periphyton were collected; these were mounted between slides and cover slips. A total of 94 taxa of plankton and 54 taxa of periphyton were collected. One species of Rotifera was present in the stomach contents, plankton and periphyton. Cluster analysis based on species composition of the organisms present in the stomach contents grouped the streams into two major groups, each belonging to a different drainage area. Correlations based on presence/absence of species of microalgae in the stomach contents, plankton and periphyton indicated significant associations (p<0.05) between stomach contents and plankton and between plankton and periphyton (z test); the Sorensen coefficient and cluster analysis corroborate the same associations.

【 授权许可】

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