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Species composition, density, and biomass of the Szczecin Lagoon macrofauna from 1984-1988 were studied. Between-station differences in fauna composition were related to differences in salinity, type of bottom, and location and allowed division of the stations into 4 groups. Changes in numbers and biomass of macrofauna were interrelated within the whole area of investigation. The causes of the changes...
The production of larvae, the formation of statoblasts, and the growth rate of colonies of Plumatella fungosa were investigated in two Polish eutrophic lakes. On the basis of the obtained results and data referring to the seasonal changes in the biomass, origin, and distribution of the bryozoan colonies the author gives a schematic presentation of the life cycle of P. fungosa in the studied lakes.
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