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Estudo comparativo da composição do zooplâncton de dois ecossistemas lacustres da Amazônia Sul-Ocidental

2003; Editora da Universidade Estadual de Maringá (Eduem); Volume: 25; Issue: 2 Linguagem: Inglês

10.4025/actascibiolsci.v25i2.2042

1807-863X

Erlei Cassiano Keppeler,

Water Quality and Pollution Assessment

The zooplankton communities of two lacustrine ecosystems in southwestern Amazonia (Lago Amapá and Lago Pirapora) were studied based on samples collected over an 11-month period. The general aim of the present work was to contribute to the knowledge of the zooplankton fauna in southwestern Amazonia, by studying the occurrence of certain species; and to improve the knowledge of the Rio Acre tributaries. The total number of taxa included 38 species of rotifers, 6 cladocerans and 7 copepods. Most of the species were from the rotifer family Brachionidae. Jaccard´s similarity index was similar for the two lakes at 0.6964 The constancy index defined the species Keratella cochlearis, Filinia cf. terminalis, Filinia opoliensis, Hexarthra intermedia braziliensis, Ceriodaphnia cornuta, Moina minuta, Diaphanosoma spinulosum, and immature forms (nauplii and copepodites) as the constant in these lakes. The presence of zooplankton with higher number of species occupying the middle depths, during morning and night periods