Dynamics of Cladocera Community in a Tropical Hypereutrophic Environment (Garças Reservoir, São Paulo, Brazil)

Ariane Carolina Di Genaro, Suzana Sendacz, Munique de Almeida Bispo Moraes, Cacilda Thais Janson Mercante^*

Water Resources Center, Fisheries Institute, Sao Paulo, Brazil.

DOI: 10.4236/jwarp.2015.75030                

Abstract

This study was performed at Garcas Reservoir, a hypereutrophic urban lake within Sao Paulo metropolitan area, Southeast Brazil. This reservoir underwent to a marked limnological change after the harvest of free floating macrophytes, shifting to a hypereutrophic state. Present purposes were to characterize the Cladocera community and verify its association with the water deterioration after the macrophytes removal period as well as to compare it to previous studies, before macrophytes harvesting. Samplings were collected from October 2007 until September 2008 and the results were compared to data obtained during pre-removal period (1997). Principal Component Analysis (PCA) showed that the highest values for water transparency were associated with the macrophytes pre-removal period while the highest values of electrical conductivity, chlorophyll a and total phosphorus were associated with the macrophytes post-removal period, indicating the degradation of the water quality. During this period, large cladocerans disappeared and the small sized species of Bosmina predominated. Male organisms of this genus were found as well as elevated densities of Bosmina huaroensis, suggesting overcrowding. Furthermore, it was detected a reduction of 82% in the number of species compared to data from 1997. The shifts to the hypereutrophic state led to aggressive alterations in Cladocera community, suggesting a strong stress on populations.

Keywords

Eutrophycation, Zooplankton, Cladocerans, Bosmina, Tropical Reservoir

Conflicts of Interest

The authors declare no conflicts of interest.

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