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JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 9 | PAGES 1269-1276 | 1994
© Oxford University Press

other

Notes on a Mesodinium rubrum red tide in San Francisco Bay (California, USA)

James E. Cloern1, Brian E. Cole and Stephen W. Hager

US Geological Survey MS496, 345 Middle field Road, Menlo Park, CA94025, USA

Received on December 2, 1993; accepted on April 21, 1994

Discrete red patches of water were observed in South San Francisco Bay (USA) on 30 April 1993, and examination of live samples showed that this red tide was caused by surface accumulations of the pigmented ciliate Mesodinium rubrum. Vertical profiles showed strong salinity and temperature stratification in the upper 5 m, peak chlorophyll fluorescence in the upper meter, and differences in the small-scale density structure and fluorescence distribution among red patches. Events preceding this Mesodinium red tide included: (i) heavy precipitation and run-off, allowing for strong salinity stratification; (ii) a spring diatom bloom where the chlorophyll a concentration reached 50 mg m–3; (ii) depletions of dissolved inorganic N and Si in the photic zone; and (iv) several days of rapid warming and stabilization of the upper surface layer. These conditions may be general prerequisites for M.rubrum blooms in temperate estuaries.

1Present address: Station Marine d'Endoume, Centre d'Oceanologie de Marseille, rue Batterie des Lions, 13007 Marseille, France


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M. Kyewalyanga, S. Sathyendranath, and T. Platt
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[Abstract] [Full Text] [PDF]


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