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Primary productivity and phytoplankton size fraction dominance in a temperate North Atlantic estuary

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Abstract

The composition, productivity, and standing crop of net (>20 μm) and nano-(<20 μm) phytoplankton of Peconic Bay, Long Island, New York was examined from June 1978 through May 1979. Nanoplankton, primarily small solitary flagellates, chlorophytes, and diatoms, dominated from May through September accounting for 88.5% of the productivity and 88.1% of the standing crop (measured as chlorophyll a). An apparent net plankton bloom began in December and continued through March. The dominant organism through most of the winter bloom was the chain-forming diatom Skeletonema costatum (Grev.) Cl. Net plankton at this time represented 66.4% of the standing crop. For both size fractions, productivity/chlorophyll a (g C per g chl a per d, integrated through the euphotic zone) was a function of light energy over the year with the exception of a few sampling dates during the post-winter bloom period. Assimilation numbers (g C per g chl a per h at saturating light intensities) were a function of temperature between 0 and 20°C. Nitrogen deficiency did not appear to be a factor in regulating phytoplankton growth rate through the euphotic zone, as ratios of 14C assimilation for dark bottles enriched with NH3 and with no enrichment exhibited no relationship to environmental dissolved inorganic nitrogen concentrations. Zooplankton grazing pressure appeared to have been an important factor in regulating the upper limit of phytoplankton biomass and in influencing size fraction dominance. Dominance of one phytoplankton size fraction over the other on any given date was not based on physiological differences between the two groups since both fractions were composed of the same species. Apparent net phytoplankton blooms (in terms of productivity and chlorophyll a) were artifacts of increased chain lengths of nanoplankton diatoms such as Skeletonema costatum, and to a lesser extent, Thalassiosira nordenskioldii Cl. and Detonula confervacea (Cl.) Gran, rather than to the dominance of large, solitary cells.

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Author notes

  1. Stephen F. Bruno

    Present address: , 11 Clinton Street, 11937, East Hampton, New York

  2. Robert D. Staker

    Present address: , 4832 Harlow Drive, 45432, Dayton, Ohio

  3. Gurdial M. Sharma

    Present address: Department of Chemistry, William Paterson College of New Jersey, 07470, Wayne, New Jersey

  4. Jefferson T. Turner

    Present address: National Marine Fisheries Service, NOAA Beaufort, 28516, North Carolina

Authors and Affiliations

  1. New York Ocean Science Laboratory, 11954, Montauk, New York

    Stephen F. Bruno, Robert D. Staker, Gurdial M. Sharma & Jefferson T. Turner

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Bruno, S.F., Staker, R.D., Sharma, G.M. et al. Primary productivity and phytoplankton size fraction dominance in a temperate North Atlantic estuary. Estuaries 6, 200–211 (1983). https://doi.org/10.2307/1351512

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  • DOI: https://doi.org/10.2307/1351512

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