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Thermodynamics of cercarial survival and metabolism in a changing climate

Published online by Cambridge University Press:  08 August 2011

N. J. MORLEY
N. J. MORLEY*
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
*
*Corresponding author: Tel: +44 (0)1784 443186. Fax: +44 (0)1784 414224. E-mail: n.morley@rhul.ac.uk
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Summary

Cercariae are non-feeding free-living stages in the life cycles of trematodes, highly influenced by temperature. Their life span is brief, limited by the depletion of a non-renewable glycogen store. Warmer temperatures under the influence of climate change may promote the transmission of parasites and therefore understanding their thermobiology forms an important step in discerning the future dynamics of parasite populations. An empirical relationship exists between cercarial mean expected life span and the half-life of the population (t0·5) and therefore t0·5 is a good indicator of glycogen utilization. In this study experimental data on the effects of temperature on cercarial survival is compiled from the scientific literature and evaluated in terms of metabolism using Q10 and Arrhenius activation energy (E* or μ), common measures of temperature-mediated reaction rates. Cercariae have a variable response to temperature, which does not appear to be influenced by their life-history attributes or size. There were little differences in Q10 and E* values between most temperature ranges. In almost half the studies examined (7 of 16) cercariae demonstrated a discrete zone of thermostability over a range equivalent to typical individual mean summer temperatures. Distinct intraspecific differences in temperature responses between 3 laboratory strains of Schistosoma mansoni and 2 natural strains of Echinoparyphium recurvatumsensu stricto were apparent. The importance of these results for cercarial biology under global climate change is discussed.

Keywords

cercariaetemperaturetrematodessurvivalmetabolismclimate change
Type
Research Article
Information
Parasitology , Volume 138 , Issue 11 , September 2011 , pp. 1442 - 1452
Copyright
Copyright © Cambridge University Press 2011

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