Some Ecological Factors and Their Influence on Competition Between Stream and Lake-living Triclads

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Abstract
An account of the planarian fauna on a small delta formed by a stream where it flows into a lake, Blelharn Tarn, Westmorland. The migrations of the lake-living forms are shown to be dependent largely on the nature of the substratum. Stream planarians which are washed down are capable of colonizing the stony areas, but are influenced, in the same way as are the lake-living forms, by wave action. Reasons, different from those suggested by continental workers, are given for the occurrence of Planaria alpina on the "Brandungs-zone"; these include the absence of competition with Polycelis nigra.

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