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The effects of age, temperature, light quantity and wavelength on the swimming behaviour of the cercariae of Cryptocotyle lingua (Digenea: Heterophyidae)

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

Laboratory experiments indicated that the active life-span of the cercariae of Cryptocotyle lingua was temperature-dependent. An increase in water temperature and population age both correlated with a tendency for the organisms to become decaudate. The larvae were strongly photoresponsive to lateral light but with time, horizontal swimming rates (HSRs) from release point to light source progressively declined. When measured over a range of light quantities, HSRs peaked at 30 μM/m2/s. HSRs were also influenced by water temperature. A rapid increase occurred up to 15 °C after which there was a precipitous decline. HSRs to coloured light were negatively correlated with increasing wavelength. When offered a choice between colours, cercariae favoured the shorter wavelengths. The implications of these responses for successful transmission are discussed.

Keywords

Cryptocotylecercariaebehaviouragetemperaturelight.
Type
Research Article
Information
Parasitology , Volume 105 , Issue 1 , August 1992 , pp. 131 - 137
Copyright
Copyright © Cambridge University Press 1992

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