Zooplanktonic community of six reservoirs in northeast Brazil

Brazilian Journal of Biology

Vls. Almeida²  Êw. Dantas¹  M. Melo-júnior¹  Mc. Bittencourt-oliveira¹  An. Moura¹ 

[1] ,Universidade Federal de São Carlos Centro de Ciências Biológicas e da Saúde Programa de Pós-Graduação em Ecologia e Recursos NaturaisSão Carlos SP ,Brazil

关键词: zooplankton;    reservoirs;    diversity;    Trophic Index State;    northeast Brazil;    zooplâncton;    reservatórios;    Índice de Estado Trófico;    nordeste do Brasil;   

DOI  :  10.1590/S1519-69842009000100007

来源: SciELO

【 摘 要 】

The aim of the present study was to investigate the zooplankton community at six reservoirs in the state of Pernambuco (Brazil). Zooplankton assemblages were identified using current literature and quantitatively analysed under a microscope and stereomicroscope. Concurrently to the sampling of zooplanktonic and phytoplanktonic communities, in situ measurements of abiotic variables, such as water temperature, dissolved oxygen and pH, were determined using field probes and transparency was determined with a Secchi disk. Total phosphorus concentrations were used for the determination of the Trophic State Index. The reservoirs were classified between eutrophic and hypertrophic, oxygenated, with pH varying from slightly acid to alkaline, high temperatures and low water transparency. A total of 27 zooplankton taxa were identified. Phytoplankton was represented by Cyanophyta, Chlorophyta, Baccilariophyta and phytoflagellates. The highest richness of species was observed for Rotifera (17), followed by Crustacea (8), Protozoa (1) and Insecta (1). Rotifers shared quantitative importance with Crustacea, which were mainly represented by juvenile forms. Jazigo Reservoir presented the highest diversity and equitability. Lowest diversity and equitability were recorded at the Poço da Cruz and Mundaú reservoirs, respectively. Dissimilarity was detected between the environments studied regarding zooplankton composition and structure.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License