Water samples were taken twice a month for 13 months in neritic waters off eastern Long Island. The purpose of the study was to investigate the annual phytoplankton cycle and related physical and chemical parameters associated with phytoplankton ecology. Seawater temperatures ranged between 1-22 °C, salinities were between 27.7-31.7%0, and pH averaged 7.83. Nitrate-N values may be close to limiting during the period from late May to early July; however, phosphorus levels appear to be satisfactory for phytoplankton growth. Oxygen readings were usually > 5.00 ml 1, while vitamin Bi 2 values averaged close to those found by others for coastal waters. Measurements of the phytoplankton included cell counts, Chlorophyll a, and Shannon species diversity index. A total of 125 species of planktonic algae were identified with the Bacillariophyta and Pyrrophyta contributing 93 and 25 species respectively. In terms of cell counts, Skeletonema costatum (Grev.) Cleve was the most numerous taxon; however, it was surpassed by Thalassiosira nordensktöldü Cleve and Ceratium tripos (Müll.) Nitzsch in terms of biomass. Introduction Block Island Sound is a body of water partly enclosed by Rhode Island to the north and Long Island, New York, to the south. The adjacent bodies of water
Botanica Marina – de Gruyter
Published: Jan 1, 1978
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