Riqueza, composição, abundância e distribuição de ciclopóides nas regiões litorânea e limnética do lago Tupé, Manaus, AM, Brasil

Abstract

Cyclopoids studies in Amazon Basin have been done through the years, concentrating mainly in the limnetic region of lakes and rivers, neglecting the littoral regions. In the present work, we show the composition and abundance of this species in those regions. The objective of our study was to investigate the composition, richness and abundance of cyclopoids species in various habitats from the Tupé lake. The samples was collected in the central limnetic region of the lake, and in the littoral regions, at Utricularia foliosa stands and serapilheira areas. The samples was collected in april, june, september, october and november of 2008 and february of 2009 taking qualitative and quantitative data. A total of 9 species of cyclopoids was recorded distributed in two families. The Cyclopidae family have the major number of species, while Oithonidae have the major abundance in whole study, being represented for just one specie (Oithona amazonica). We found the major richness of species at serapilheira (8), followed by U. foliosa stands (4) and limnetic region (3). The entry of water from the Negro river to the lake did not influenced the species richness and composition of cyclopoids from the limnetic region, however, this phenomenon formed new temporary habitats in the littoral region, changing the fauna from the lake. The large number of new species was mainly due to the study of the littoral region.