Seasonal cycles of phytoplankton in relation to the hydrography of Monterey Bay

Schrader, G. Carl (1981) Seasonal cycles of phytoplankton in relation to the hydrography of Monterey Bay. Moss Landing, CA, Moss Landing Marine Laboratories, (Moss Landing Marine Laboratories Technical Publications, 81-2)

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Abstract

Annual cycles of relative abundance are described for phytoplankton species collected from Monterey Bay, California, from July 1974 to June 1976, and the population dynamics related to the annual hydrographic cycle. Neritic diatom species dominated the population during the Upwelling and Oceanic periods, with dinoflagellate species becoming numerically more important during the Davidson period. Recurrent species groups identified using Fager's regroup analysis revealed the presence of a large neritic group of overwhelming numerical importance. This group is composed of indigenous species and is present in the bay during most of the year. Conspicuous changes in the phytoplankton population occurred predominantly among species within this group. During the Davidson period, the advection of southern waters into the bay may temporarily displace the endemic species with dinoflagellates becoming numerically more important. A red tide bloom of Gonyaulax polyedra occurred during this period in 1974, which dominated the phytoplankton population for a period of six weeks. The population dynamics of two hydrographically different stations were compared. A station located over the deep waters of the submarine canyon exhibited much lower phytoplankton standing stocks than a station located over the shelf area in the south of the bay, but seasonal changes in relative abundance and species composition were similar. Physical and chemical differences observed between the two stations appear to be the result of the presence of more recently upwelled water in the canyon area, and higher biological utilization in the south of the bay. A close correlation of species diversity with the depth of the mixed layer was observed, with diversity rising with the shoaling of the thermocline. It is suggested that this may reflect the introduction of new species from below the thermocline into the mixed layer as a result of upwelling activity. It is also suggested that this may be an artifact due to sampling problems associated with internal waves. (Document contains 100 pages.)

Item Type: Monograph or Serial Issue
Title: Seasonal cycles of phytoplankton in relation to the hydrography of Monterey Bay
Personal Creator/Author:
CreatorsEmail
Schrader, G. Carl
Series Name: Moss Landing Marine Laboratories Technical Publications
Number: 81-2
Date: 1981
Publisher: Moss Landing Marine Laboratories
Place of Publication: Moss Landing, CA
Latitude: 36.6266
Longitude: -121.895
Funders: State of California, Marine Research Committee, California Cooperative Oceanic Fisheries Investigations, Moss Landing Marine Laboratories of the California State University and Colleges, Fresno, Hayward, Sacramento, San Francisco, San Jose, and Stanislaus
Uncontrolled Keywords: Monterey Bay; California; phytoplankton
Subjects: Ecology
Oceanography
Item ID: 1453
Depositing User: Joan Parker
Date Deposited: 22 Sep 2008 16:38
Last Modified: 29 Sep 2011 20:33
URI: http://aquaticcommons.org/id/eprint/1453

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