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The purpose of the present study was to analyze the temporal variation of phytoplankton in th middle course of Pindare river. Water samples were collected in six different spots along the Pindare river middle course during the peaks of rainy and dry seasons. The phytoplankton was sampled with a plankton net of a 20 μm mesh and Von Dorn bottle. The samples were preserved in formalin 4% and lugol respectively. The Pindare River contains high biodiversity of plankton microalgae and it is represented by a total of 98 species distributed in six classes. The Bacillariophyceae class is the best represented whereas the Cyanophyceae class is the least diversified. The phytoplankton showed higher density values during rainy season and lower values during dry season. The diversity and equitability were high throughout the study period. The composition of the phytoplankton community suffered a clear seasonal variation, during the year of study.

VARIAÇÃO TEMPORAL DO FITOPLÂNCTON EM UM RIO TROPICAL PRÉ-AMAZÔNICO (RIO PINDARÉ, MARANHÃO, BRASIL).