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A laboratory study of predation on lake-dwelling triclads

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Summary

Predation on four species of triclads was investigated by exposing them to likely predators in the laboratory. The only serious littoral predators would seem to be dragonfly nymphs and adult Dytiscus marginalis. Although fish devoured triclads to some extent it is argued that predation by these in nature is unlikely. The slow movement and distastefulness of triclads contribute to their protection.

Zusammenfassung

Als raubtierhafte Beute wurden vier Trikladen-Arten untersucht, indem these im Laboratorium geeigneten Raubtieren ausgesetzt wurden. Die Libellennymphe und die Dysticus marginalis-Imago sind in der Uferregion des Sees anscheinend die einzigen Raubtiere von Belang. Zwar haben auch Fische Trikladen einigermassen verschlungen; dass jene in der Natur von Trikladen futtern, wird aber hier bezweifelt. Zu den Schutzmitteln der Trikladen tragen die langsame Bewegung und der unangenehme Geschmack bei.

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Young, J.O., Reynoldson, T.B. A laboratory study of predation on lake-dwelling triclads. Hydrobiologia 26, 307–313 (1965). https://doi.org/10.1007/BF00142274

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