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Keywords	Cyanobacteria, Chlorophyta, reservoir, Brazil.
Abstract	Short-term fluctuations and structure of phytoplankton were examined for two months in the dry season (August-September/1997) in a eutrophic reservoir of central Brazil. Algicide treatment for the control of Microcystis aeruginosa bloom influenced the short-term variation pattern of the phytoplankton community. Algicide treatment was effective in controlling M. aeruginosa bloom, but it also influenced the Cylindrospermopsis raciborskii population. These species retained low densities, showing small colonies and trichomes, respectively. Drops in Cyanobacteria populations following algicide treatment were succeeded by progressive increase in Chlorophyta. The shifts in environmental conditions may have allowed the development of this group. In this study correspondence analysis of abundance data for phytoplankton assemblage in lake Paranoa revealed that available light, rather than chlorophyll-a, total suspended material, and water temperature, accounted for most of the short-term fluctuation in phytoplankton structure during algicide application. Canonical correspondance analysis (CCA) showed the primary importance of water transparency changes in abundance of taxa in the community. Algicide treatment for the control of nuisance blooms is discussed as a contribution to improved efficiency in reservoir management.
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Name	Affiliation	Home page	e-mail	Total pubs
Padovesi-Fonseca C	Departamento de Ecologia Instituto de Ciencias Biologicas Universidade de Brasilia, C.P. 04631, CEP 70919-970, Brasilia, DF, Brazil		padovesi@unb.br	2
Philomeno MG	Departamento de Ecologia/IB, Universidade de Brasilia, UnB, Brazil			1