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A TRANSIENT BLOOM OF OSTREOCOCCUS (CHLOROPHYTA, PRASINOPHYCEAE) IN WEST NECK BAY, LONG ISLAND, NEW YORK
Authors:Charles J O'Kelly  Michael E Sieracki  Edward C Thier  Ilana C Hobson
Institution:Bigelow Laboratory for Ocean Sciences, P.O. Box 475, 180 McKown Point Road, West Boothbay Harbor, Maine 04575, USA
Abstract:The smallest known eukaryote, Ostreococcus tauri Courties et Chrétiennot-Dinet, was first reported as the dominant picoplankter in a French lagoon known for its diverse phytoplankton community and high oyster productivity. Long-term seasonal blooms of this picoeukaryote were observed in association with stable plankton communities. On 5 June 2001, a distinctive monotypic picoplankton bloom was detected by flow cytometry as part of an ongoing study of "brown tide" ( Aureococcus anophagefferens ) bloom initiation in Long Island bays. The bloom reached a concentration of 5 × 105 cells·mL−1 in West Neck Bay and lasted less than 2 weeks. Epifluorescence microscopy and TEM indicated that the bloom organism was an Ostreococcus -like picoalga, the first ever observed in a Long Island bay. Many cells of this alga contained numerous virus-like particles. The Ostreococcus -like picoalga, which resembles O. tauri , was rare in samples collected the following week. Instead, a substantial increase in the Synechococcus population was observed. Such rapid population changes have not previously been reported for Ostreococcus . Viral lysis and grazing by heterotrophic nanoflagellates may have contributed to the rapid decline of the Ostreococcus -like cells in West Neck Bay.
Keywords:bloom dynamics              Ostreococcus    picoalgae  picoplankton
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