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Behavioural responses of the cercariae of Cryptocotyle lingua (Digenea: Heterophyidae) to computer-controlled shadow sequences

Published online by Cambridge University Press:  06 April 2009

J. G. Rea  and
S. W. B. Irwin
J. G. Rea
Affiliation:
Department of Biological and Biomedical Sciences, University of Ulster at Jordanstown, Newtownabbey, Co. Antrim BT37 0QB, N. Ireland
S. W. B. Irwin
Affiliation:
Department of Biological and Biomedical Sciences, University of Ulster at Jordanstown, Newtownabbey, Co. Antrim BT37 0QB, N. Ireland
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Extract

The cercariae of Cryptocotyle lingua have a brief but active life during which they do not feed. In order to maximize the probability of infection they must respond to a variety of host-related stimuli yet conserve their finite energy reserves by minimizing unnecessary muscular activity. In laboratory experiments, simulated shadows representing the passage of a fish host were found to increase population activity levels. Evidence was also found for a relationship between shadow duration and the duration of subsequent bursts of swimming activity. Adaptation to continuous shadowing was recorded, its onset and magnitude being dependent on both the frequency and duration of shadows delivered. As cercariae aged they became less responsive to shadow stimuli, especially those of short duration.

Keywords

Cryptocotylecercariaebehaviourshadow responseage

Information

Type
Research Article
Information
Parasitology , Volume 103 , Issue 3 , December 1991 , pp. 471 - 477
Copyright
Copyright © Cambridge University Press 1991

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