The phytoplankton component of seston in San Francisco Bay |
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Institution: | 1. Department of Clinical Laboratory Medicine, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan;2. Department of Medical Technology, Niigata College of Medical Technology, 5-13-3 Kamishinei-cho, Nishi-ku, Niigata-shi, Niigata 950-2076, Japan;3. Center for Genomic and Regenerative Medicine, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan;1. LEMAR — UMR 6539, IUEM Technopôle Brest-Iroise, 29280 Plouzané, France;2. LEGOS — UMR 5566, 31401 Toulouse cedex 9, France;3. France Energies Marines, 29200 Brest, France;1. Université de Nantes, CNRS, Laboratoire de Thermocinétique, UMR 6607, La Chantrerie, Rue Christian Pauc, B.P. 50609, F-44306 Nantes Cedex 3, France;2. Université de Nantes, CNRS, Genie des Procédés – Environnement Agroalimentaire, UMR 6144, 37 boulevard de l’Université, BP 406, 44602 Saint-Nazaire Cedex, France |
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Abstract: | Phytoplankton biomass (as carbon) was estimated from chlorophyll a concentrations (Chla) and a mean value for the ratio of phytoplankton carbon to chlorophyll a in San Francisco Bay. The ratio was determined as the slope of a Model II regression of POC' against (Chla), where POC' is total particulate organic carbon minus sediment-associated non-phytoplankton carbon. Samples from 30 fixed sites in the channel and lateral shoals of San Francisco Bay were collected once or twice a month from April to November 1980, and at irregular intervals in South Bay during 1984 and 1985. For all data the calculated mean value of phytoplankton C:Chla was 51 (95% confidence interval = 47–54). No significant differences were found in the C:Chla ratio between shallow and deep sites (where light availability differs) or between northern and southern San Francisco Bay (where phytoplankton community composition differs). Using the mean C:Chla ratio of 51, we calculated that phytoplankton biomass constitutes about one third of seston carbon under most circumstances, but this fraction ranges from about 95% during phytoplankton blooms to less than 20% during spring periods of low phytoplankton biomass and high suspended sediment concentration. |
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