Effects of mixing and silica enrichment on phytoplankton seasonal succession |
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Authors: | Andrew Klemer John Barko |
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Institution: | (1) Biology Department, University of Minnesota, 55812 Duluth, Minnesota, USA;(2) Environmental Laboratory, Waterways Experiment Station, P.O. Box 631, 34180 Vicksburg, Mississippi, USA |
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Abstract: | During the summer of 1983, cryptophytes, diatoms, cyanophytes, and the dinoflagellate, Ceratium hirundinella were most prominant among the phytoplankton of Eau Galle Reservoir. In the open water, cryptophytes and diatoms peaked in the spring, cyanophytes were most successful in the early summer, and Ceratium was dominant from mid-July until early August. In general, the sequence of events corresponded quite closely to the model of seasonal succession developed by the Plankton Ecology Group of the International Society of Limnology. To a large extent, the same pattern held in four experimental water columns. Departures from the model involved the roles of specific nutrients in diatom and cyanophyte periodicity. Diatoms began to yield to cyanophytes in late spring despite intermittent mixing and silica enrichment. Although capable of buoyancy regulation and thus well adapted to stable water columns, cyanophytes had greater increases in biomass in mixed columns, and in those columns, were most successful during a period of intermittent mixing. Cyanophyte success varied inversely with TN : TP ratios during the period of intermittent mixing, but not subsequently. By mid-July, Ceratium dominated the phytoplankton of every column except that of a mixed column in which conditions favored cyanophytes and large diatom species. |
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Keywords: | phytoplankton succession mixing silica enrichment nutrients nitrogen phosphorus carbon carbon dioxide bicarbonate light transparency cryptophytes diatoms blue green algae cyanophytes dinoflagellates greens dominance |
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