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Field measurements on seasonal variation of the activity of primary producers on a sandy tidal flat in the Northern Wadden Sea
Asmus, R. (1982). Field measurements on seasonal variation of the activity of primary producers on a sandy tidal flat in the Northern Wadden Sea. Neth. J. Sea Res. 16: 389-402
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
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Keyword
    Marine

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Abstract
    In 1980 chlorophyll a and biomass of phytoplankton showed two distinct peaks in spring and late summer. Thalassiosira nordenskiöldii dominated the spring bloom, whereas in late summer Thalassiosira eccentrica and Biddulphia rhombus reached a maximum. Microphytobenthos biomass was dominated by the small species Achnanthes hauckiana. Highest biomass of microphytobenthos was attained in late winter. Gross primary productivity of the community amounted to 100 g C. m-2.a-1 during time of submersion, 68% of which produced by microphytobenthos, 32% by phytoplankton. In spite of increasing production in summer, microphytobenthos did not increase in biomass. This is assumed to be due to grazing by the snail Hydrobia ulvae.

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