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Effects of silicate depletion on photosynthesis by diatoms in the plume of the Hudson River

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Abstract

Silicate depletion was observed during a bloom of netplankton diatoms. Netplankton chlorophyll a increased over the same salinity range and at the same rate that silicate decreased. Silicate depletion coincided with a decrease in the apparent Si:N uptake ratio as well as a change in the magnitude and diurnal phasing of light saturated photosynthesis (P Bm ) by netplankton diatoms. Nanoplankton P Bm was unaffected by silicate depletion and increased with temperature. Consequently, nanoplankton P Bm eventually exceeded netplankton P Bm while netplankton biomass was still increasing relative to nanoplankton biomass.

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Authors and Affiliations

  1. Marine Biology, Lamont-Doherty Geological Observatory, 10964, Palisades, NY, USA

    T. C. Malone & P. J. Neale

  2. Bigelow Laboratory for Ocean Sciences, 04575, West Boothbay Harbor, ME, USA

    C. Garside

Authors
  1. T. C. Malone
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  2. C. Garside
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  3. P. J. Neale
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Communicated by I. Morris, West Boothbay Harbor

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Malone, T.C., Garside, C. & Neale, P.J. Effects of silicate depletion on photosynthesis by diatoms in the plume of the Hudson River. Marine Biology 58, 197–204 (1980). https://doi.org/10.1007/BF00391876

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