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JPR Advance Access published online on February 28, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn032
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

The response of zooplankton assemblages to variations in the water quality of four man-made lakes in semi-arid northeastern Brazil

Wanessa Sousa1, José Luiz Attayde2,*, Elinez Da Silva Rocha3 and Eneida Maria Eskinazi-Sant'Anna4

1 Universidade Federal do Rio Grande do Norte, Centro de Biociências, Departamento de Botânica, Ecologia e Zoologia, Campus Universitário, Lagoa Nova, 59072-970, Natal, RN, Brazil 2 Universidade Federal do Rio Grande do Norte, Centro de Biociências, Departamento de Botânica, Ecologia e Zoologia, Campus Universitário, Lagoa Nova, 59072-970, Natal, RN, Brazil 3 Universidade Federal do Rio Grande do Norte, Centro de Biociências, Departamento de Botânica, Ecologia e Zoologia, Campus Universitário, Lagoa Nova, 59072-970, Natal, RN, Brazil 4 Universidade Federal do Rio Grande do Norte, Centro de Biociências, Departamento de Oceanografia e Limnologia, Praia de Mãe Luiza, 59014-100, Natal, RN, Brazil

* CORRESPONDING AUTHOR: attayde{at}cb.ufrn.br

Received on November 12, 2007; revised on February 18, 2008; accepted on February 26, 2008


  Abstract

The response of zooplankton assemblages to variations in the water quality of four man-made lakes, caused by eutrophication and siltation, was investigated by means of canonical correspondence analysis. Monte Carlo simulations using the CCA eigenvalues as test statistics revealed that changes in zooplankton species composition along the environmental gradients of trophic state and abiogenic turbidity were highly significant. Brachionus calyciflorus, Thermocyclops sp. and Argyrodiaptomus sp. were good indicators of eutrophic conditions, whereas Brachionus dolabratus, Keratella tropica and Hexarthra mira were good indicators of high turbidity due to suspended sediments. Overall, our results showed that changes in the water quality of man-made lakes in a tropical semi-arid region have significant effects on the structure of zooplankton assemblages that can potentially affect the functioning of these ecosystems.

Key Words: zooplankton assemblages • eutrophication • siltation • canonical correspondence analysis

Communicating Editor : Dr Roger Harris


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