Abstract
A brief evaluation of the present status of knowledge concerning the basic ecology of the zooplankton and zoobenthos of the Great Lakes is presented by considering (1) the species of invertebrates that occur in the Great Lakes, (2) how these species are distributed in space and time, and (3) the factors that cause the observed distributions. It is concluded that we are well along at describing what invertebrates occur in the lakes, but there are still major gaps in our knowledge. Regarding distribution, there is now a good data base for describing the distributions of a number of the most important species, but in most cases the results from separate surveys have not been pulled together to develop generalizations with broad application throughout the Great Lakes. Finally, understanding concerning the control of distributions of Great Lakes invertebrates is still at a rudimentary stage, even though such understanding is a basic requirement for evaluating natural and man-induced changes or potential changes in these ecosystems.
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