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An Experimental Field Study of Chemoreception and Response in Australorbis Glabratus (Say) under Rheotactic Conditions^*

Measurement of rheotactic responses of Australorbis glabratus indicated that stream velocities above 35 cm/sec prevent any degree of upstream progression, but that below this flow rate snails show increasing ability for positive rheotactic orientation movement. When chemical attractants were applied, A. glabratus increased its rate of upstream migration. Persistence of increased progression rates after the cessation of chemical stimulation suggests a behavioral pattern similar to that known to exist in insects subjected to pheromonal stimulation.

^* This study was supported by an Interamerican Programs Research Fellowship, awarded to the senior author by Louisiana State University, School of Medicine, and employed the facilities of the U.S. Army Tropical Research Medical Laboratory, APO 851, New York.