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Persistent blooms of surf diatoms along the Pacific coast, USA

IV. Diatom productivity and its relation to standing stock

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Abstract

Productivity was studied in two diatom species, Chaetoceros armatum T. West and Asterionella socialis Lewin and Norris, which form persistent dense blooms in the surf zone along the Pacific coast of Washington and Oregon, USA. Past observations have shown that surf-diatom standing stock usually declines in summer along with concentrations of nitrate and ammonium. Using the 14C method, photosynthetic rates in natural surf samples were measured monthly for one year (October 1981 through September 1982) at a study site on the Washington coast. Also measured were temperature, salinity, dissolved nutrients, particulate carbon and nitrogen (used as estimates of phytoplankton C and N), and chlorophyll a. Assimilation numbers (P max) were higher in summer (5 to 8 g C g-1 chl a h-1) than in winter (3 to 4gC). Specific carbon incorporation rates (µ′max) showed no obvious seasonality, mostly falling within the range of 0.09 to 0.13 g C g-1 C(POC) h-1. The discrepancy between the seasonal trends for chlorophyll-specific and carbon-specific rates reflects a change in the carbon-to-chlorophyll ratio. Because of seasonal differences in daylength and light intensity, daily specific growth rates (μ) are thought to be higher in summer than in winter. Neither ammonium enrichment assays nor particulate carbon-to-nitrogen ratios provided convincing evidence for nitrogen limitation during summer, and the observed changes in diatom abundance cannot be explained on this basis. Both the high diatom concentrations and their seasonal variations probably are due mainly to factors other than growth rates; two factors considered important are diatom flotation and seasonal changes in wind-driven water transport. C. armatum usually dominates the phytoplankton biomass in the surf zone, and evidence suggests that this species is strongly dominant in terms of primary production.

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  1. School of Oceanography, WB-10, University of Washington, 98195, Seattle, Washington, USA

    C. T. Schaefer

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  1. C. T. Schaefer
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  2. J. Lewin
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Communicated by N. D. Holland, La Jolla

Contribution No. 1391 of the School of Oceanography, University of Washington, Seattle, Washington, USA

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Schaefer, C.T., Lewin, J. Persistent blooms of surf diatoms along the Pacific coast, USA. Mar. Biol. 83, 205–217 (1984). https://doi.org/10.1007/BF00394729

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