Abstract
Numerous Vorticella were found attached to blue-green algal colonies in the plankton of a mesotrophic lake in northwestern Wisconsin [USA]. Vorticellids attached to Nostoc perferentially when Nostoc was present. As many as 200 Vorticella were found attached to single colonies of Nostoc. The numbers of Vorticella and Nostoc fluctuated in parallel patterns. The preferential association of Vorticella with Nostoc described here has not been reported.

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