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- W1969864734 abstract "Jacarepaguá Lagoon is a shallow, hypereutrophic, coastal lagoon located in Rio de Janeiro (RJ, Brazil), with recurrent blooms of cyanobacteria. This study was carried out with the aim to detect the effects of the cyanobacterium Microcystis aeruginosa on zooplankton populations (especially cladocerans) in the lagoon. At two sampling stations we measured temperature, pH, salinity, dissolved oxygen and transparency, and collected water samples for chemical analyses of particulate organic carbon (POC), chlorophyll-a and toxins (microcystins), and plankton samples for phytoplankton and zooplankton analyses, from August 1996 to September 1997. Laboratory experiments were also performed to test for toxicity of both natural assemblages and cultured Microcystis. The results showed that temperature, salinity and cyanobacteria biomass were the best descriptors of the population dynamics of Cladocera. In spite of high levels of microcystins in seston, toxins were not generally correlated with the density of Cladocera. Laboratory experiments, however, showed strong evidence of the toxicity of seston to Cladocera. Also, high levels of toxins in seston were associated with a collapse of cladoceran populations in the lagoon, suggesting toxic effects of mycrocystins on these organisms. Rotifers and copepods were less affected by cyanobacteria, maintaining high densities in the lagoon throughout the bloom. We conclude that blooms of Microcystis aeruginosa are potentially harmful for cladoceran populations in nature." @default.
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- W1969864734 date "2002-12-01" @default.
- W1969864734 modified "2023-09-26" @default.
- W1969864734 title "Influences of a Microcystis aeruginosa Kützing bloom on zooplankton populations in Jacarepaguá Lagoon (Rio de Janeiro, Brazil)" @default.
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- W1969864734 doi "https://doi.org/10.1016/s0075-9511(02)80021-4" @default.
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