Predator avoidance by the freshwater snailPhysella virgata in response to the crayfishProcambarus simulans
作者： J. E. Alexander , A. P. Covich
DOI: 10.1007/BF00634603
关键词: Ecology 、 Mollusca 、 Crustacean 、 Gastropoda 、 Physa 、 Decapoda 、 Biology 、 Crayfish 、 Foraging 、 Predation
摘要: We examined predator avoidance behavior of the freshwater snailPhysella (=Physa) virgata in response to crayfishProcambarus simulans. In both laboratory and field enclosure experiments snails crawled above waterline for 2 h or longer, then returned water.Physella react chemical signals given off by crayfish actively foraging on conspecific snails; they do not inactive crayfish. Low dissolved oxygen, crowding, disturbance sediments did elicit “crawlout” behavior. Crawling waterline, reducing probability encounter between vulnerable, thin-shelled crayfish, is an adaptive predation.
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