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Phytoplankton composition and abundance of a central Amazonian floodplain lake

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Abstract

The phytoplankton community of Lake Camaleão, a smallfloodplainlake influenced by a large whitewater river, the Solimões, was monthlyinvestigated for the composition and abundance of itsphytoplankton. The seasonal influence of the floodregime on biomass, species richness and diversity, andits relation with physical and chemical factors(temperature, pH, dissolved oxygen, electricalconductivity, total seston and inorganic nutrients)was analyzed and subjected to principal componentanalysis. Diversity was variable along the seasonalcycle: relatively high values were observed at the endof the dry season supported by high nutrientconcentrations. The phytoplankton was comprised of 262 taxa,with strong dominanceof euglenoids (81%). The three sample stations did not differamong each other, except in the dry season, due todata cluster in relation to theprincipal axis (1 and 2), explaining 63% of thevariation. Biomass accumulation as a function of lakearea reduction contributed to theseresults, indicating that the phytoplankton dynamicswere hydrology-driven.

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Authors and Affiliations

  1. Departamento de Oceanografia e Limnologia, Universidade Federal do Maranhão, Largo dos Amores, 21, São Luís, MA, Brazil, CEP 65020-240

    Maria do Socorro Rodrigues Ibañez

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  1. Maria do Socorro Rodrigues Ibañez
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Ibañez, M.d.S.R. Phytoplankton composition and abundance of a central Amazonian floodplain lake. Hydrobiologia 362, 79–83 (1997). https://doi.org/10.1023/A:1003124905996

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