Abstract
A red tide of the marine dinoflagellate Heterocapsa triquetra (Ehrenberg) Stein was studied in the fjordlike Mariehamn ferry harbour area (Åland, SW Finland) in 1996. The red tide started in mid-July in the inner harbour area where high phosphorus levels and low TN:TP ratios were recorded. In red water the H. triquetra densities often exceeded 5000 cells ml−1 and the chlorophyll a levels locally exceeded 20 μg l−1 in late July and early August. Despite frequent and deep mixing due to ship traffic, H. triquetra formed near-surface maxima. Artificial mixing by scheduled traffic constitutes an unnatural selection mechanism, theoretically favouring fast-swimming phytoplankters like H. triquetra.
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Lindholm, T., Nummelin, C. Red tide of the dinoflagellate Heterocapsa triquetra (Dinophyta) in a ferry-mixed coastal inlet. Hydrobiologia 393, 245–251 (1999). https://doi.org/10.1023/A:1003563022422
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DOI: https://doi.org/10.1023/A:1003563022422