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Growth pattern and cellular nitrogen and phosphorus contents of the dinoflagellate Peridinium penardii (Lemm.) Lemm. causing a freshwater red tide in a reservoir
Authors:Zen'ichiro Kawabata  Yumiko Hirano
Affiliation:(1) Department of Environmental Conservation, Ehime University, 790 Matsuyama, Japan
Abstract:The population growth pattern and related changes in both the nitrogen and phosphorus contents in the cell of the dinoflagellate Peridinium penardii (Lemm.) Lemm., which formed a freshwater red tide in a reservoir, were studied in situ. An exponential increase with time in population density was found. A specific growth rate of 0.25 d–1 was observed. The cellular content of phosphorus per cell decreased from 6.0 × 10–5 µg to 9.2 × 10–6 µg along with an increase in population density from 8.0 × 102 cells ml–1 to 2.5 × 104 cells ml–1. A prominent change in the cellular nitrogen did not occur. Decreasing cell content and continuous uptake of phosphorus were advantageous for P. penardii to form a freshwater red tide under P-limited conditions.
Keywords:dinoflagellate  Peridinium penardii  freshwater red tide  reservoir  specific growth rate  cellular phosphorus content
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