Abstract
The rotifer plankton was studied in some freshwater and brackish water localities in easternmost Central Sweden. Concerning the general character and rotifer plankton, some of the lakes agreed with the type previously studied e.g. on the island of Gotland and designated as oligotrophic - highly calcareous. Some of the lakes were recently separated from the sea, and in some others brackish water still intrudes at times. In such localities Synchaeta gyrina Hood was abundant. This rotifer evidently constitutes an edge species between brackish and fresh water. In the purely brackish localities, on the other hand, the species composition was similar to that found elsewhere in Baltic zooplankton.
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