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Thermodynamics of cercarial development and emergence in trematodes

Published online by Cambridge University Press:  20 December 2012

N. J. MORLEY  and
J. W. LEWIS
N. J. MORLEY*
Affiliation:
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK
J. W. LEWIS
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

Temperature is an important factor influencing the biology of ectothermic organisms and is intrinsically linked to climate change. Trematodes are potentially susceptible to temperature changes and in order to develop predictive frameworks of their responses to climate change large-scale analyses are needed. The present study, using the Q10 value, analyses experimental data from the scientific literature on the effects of temperature on cercarial development and emergence across a wide range of temperature in low (⩽35°) and mid-latitude (36–60°) species. Temperature appears to have no significant effect on the rate of development of cercariae within molluscan hosts. Data on cercarial emergence, corrected to incorporate the minimum emergence temperature threshold (METT) and acclimation status, was found to be largely unaffected by temperature over optimum ranges of ≈20 °C (15–25 °C) for mid-latitude species and ≈25 °C (20–30 °C) for low-latitude species. In addition, a decline in emergence rates was shown at higher temperatures. These results are contrary to a previous study on the meta-analysis of cercarial emergence. Some evidence of strain-specific differences and thermostability over a wide temperature range for both cercarial development and emergence was apparent. The significance of these results in furthering our understanding of cercarial biology under natural conditions is discussed.

Keywords

cercariaedevelopmentemergencesheddingtemperatureclimate change

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Type
Research Article
Information
Parasitology , Volume 140 , Issue 10 , September 2013 , pp. 1211 - 1224
Copyright
Copyright © Cambridge University Press 2012 

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