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JPR Advance Access published online on December 1, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi111
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received July 21, 2005
Accepted November 30, 2005

Article

Phytoplankton Community of Floodplain Lakes of the Araguaia River, Brazil, in the Rainy and Dry Seasons

J.C. Nabout 1 *, I.S. Nogueira 1, and L.G. Oliveira 1

1 Universidade Federal de Goiás - ICB I - Departamento de Biologia - Laboratório de Limnologia - C.P. 131 Campus II - Goiânia - GO. 74001-970

* To whom correspondence should be addressed.
J.C. Nabout, E-mail: naboutjc{at}hotmail.com


  Abstract

This work analyzes the attributes of the phytoplankton community (species richness, biovolume, diversity, equitability, abundance, dominance and size structure) associated with some physical, chemical, and climatic variables of floodplain lakes of the Araguaia River, central Brazil, in the rainy and dry seasons of 2000 and 2001. The lakes in 2000 and 2001 presented different limnological characteristics between the periods of high and low water. The phytoplankton comprised 292 taxa, mainly Chlorophyceae and nanoplankton. In the dry seasons of both years, the functional group Y (Cryptophyceae) was the most prominent association. In high-water periods, different functional groups dominated the lakes. The canonical correspondence analysis (CCA) analysis demonstrated a separation between the rainy and dry seasons of both years. The high and low water presented different dynamics in two years due to influence of the flood pulse.

Communicating Editor: KJ Flynn
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