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Effect of temperature on survival and infectivity of Echinostoma trivolvis cercariae: a test of the energy limitation hypothesis

Published online by Cambridge University Press:  06 April 2009

J. A. Pechenik  and
B. Fried
J. A. Pechenik
Affiliation:
Biology Department, Tufts University, Medford, Massachusetts 02155, USA
B. Fried
Affiliation:
Department of Biology, Lafayette College, Easton, Pennsylvania 18042, USA
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Summary

Trematode cercariae typically become unable to successfully infect a host many hours before they die. We examined the hypothesis that both time to 50% mortality and time to loss of infective capacity are controlled to the same degree by rates of energy expenditure, by determining the relative effects of temperature on both parameters. Infective capacity was assessed by exposing Echinostoma trivolvis cercariae of different ages to a suitable second intermediate host (the gastropod Biomphalaria glabrata) and counting 1–2 days later the number of metacercarial cysts formed. Temperature had a remarkably similar effect on time to 50% mortality and loss of infective capacity, supporting the hypothesis that both absolute and functional cercarial life-spans are limited by the rates at which energy stores are utilized.

Keywords

Biomphalaria glabrataEchinostoma trivolviscercariaelarvaelarval life-spanmetacercariaetrematode
Type
Research Article
Information
Parasitology , Volume 111 , Issue 3 , September 1995 , pp. 373 - 378
Copyright
Copyright © Cambridge University Press 1995

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