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The effects of extended periods of drainage and submersion on condition and mortality of benthic animals
Hummel, H.; Meijboom, A.; de Wolf, L. (1986). The effects of extended periods of drainage and submersion on condition and mortality of benthic animals. J. Exp. Mar. Biol. Ecol. 103: 251-266
In: Journal of Experimental Marine Biology and Ecology. Elsevier: New York. ISSN 0022-0981; e-ISSN 1879-1697, meer
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  • Hummel, H., meer
  • Meijboom, A., meer
  • de Wolf, L.
Abstract
    Temporary closure of the storm-surge barrier in the Oosterschelde Estuary (The Netherlands) affects the tidal amplitude and rates of tidal currents. The aim of this study was to assess experimentally the effects of tidal manipulation on the numbers and condition of intertidal benthic animals. Permanent submersion did not affect the benthic animals. Most species suffered heavily from drainage, irrespective of an extra supply of tap water. The smaller animals without shells, such as anemones and small polychaetes, were the most susceptible to drainage, gastropods the least. The mortality rate was highest during the summer, somewhat lower in spring and lowest in autumn and winter. The decrease in water content and the changes in salinity in the sediment, as observed in the drained and rained sediment cores, did not contribute to the survival (or mortality rate) of the animals.
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