Lötmarker, T. (1964). Studies on planktonic Crustacea in thirteen lakes in northern Sweden. Reports of the Institute of Freshwater Research, Drottningholm. 45:113-189, figs. 1-31, appendix with figs. 32-44, tabs. 1-8.

74762

Lötmarker, T.

1964

45:113-189, figs. 1-31, appendix with figs. 32-44, tabs. 1-8.

Publication

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The effects of regulations 1 on the biological conditions of Scandinavian lakes have been the object of many investigations. Most often it is the changes in the fish populations and the bottom fauna that have been studied. Attention has seldom been paid, however, to the problems of the plankton fauna. The present study is intended to fill this gap and to give an idea of the effects that a regulation may have on the zooplankton. During the summer of 1957 plankton samples were collected in six regulated and seven unregulated lakes in northern Sweden. The sampling took place once a month during the period June—September. In some of the lakes, however, samples were taken only three times. Only the plankton organisms of great importance as fish food, the crustaceans, have been subjected to analysis. As comparatively little is known about the plankton fauna of NorthSwedish lakes, the structure of the plankton community has been studied, as well as the vertical distribution and the diurnal migration of some crustacean species. In order to understand possible differences between the lakes, the annual cycle of the different species of plankton must be known. In spite of the absence of winter samples, attempts have been made at establishing the annual cycle of some of the most abundant copepods and cladocerans. There are, however, many problems connected with the biology and ecology of the crustaceans in question, problems which cannot be solved through field observations alone. Future laboratory experiments might provide complementary information of great interest.

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