Of the rotifers inhabiting the shallow eutrophic Barther Bodden, the pelagic species feeding on fresh detritus comprising dead diatoms and green algae are of particular importance in terms of biological production. The submodel presented here refers only to this functional group (Pilinia lonyiseta, Brachionus quadridentatus and Keratellu cochleuris). The biological situation, the working hypotheses, the equation system, the measured values and coefficients used and the miring diagram are given. The curves obtained with the model are shown in detail and tested against various criteria. Agreemcnt between the model curves and the measured data is good.
The measurement of ecosystem parameters normally involves considerable effort in tcrms of sampling and analysis due to their variation in time and space. This cont'ribution describes the advantages and properties of the integrated sample and demonstrates them by comparing the statistical properties of separate samples (number of Filinia longiseta per unit volume), and integrated sample (total chlorophyll a concentration) and phytoplankton samples analyzed by the Ctermohl method. A working hypothesis is presented to explain the causes of the overdispersion that hinders phytoplankton analysis and to suggest) ways of eliminating it.
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