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The influence of climatic conditions on long-term changes in the helminth fauna of terrestrial molluscs and the implications for parasite transmission in southern England

Published online by Cambridge University Press:  01 December 2008

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
*
*E-mail: n.morley@rhul.ac.uk
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Abstract

The influence of climatic conditions on the prevalence and transmission of helminth parasites in a terrestrial mollusc population was studied in a grassland site in southern England between 1974 and 1983. Molluscs were sampled in each September of 5 years over this period (1974, 1976, 1979, 1981, 1983). Climatic conditions had a variable effect on parasite prevalence. Trematode sporocyst infections increased after wet summer and warm winter conditions and declined in hot, dry periods. Cestode infections increased after combined wet spring and summer weather and low winter temperatures, although trematode metacercariae and nematode infections were less likely to be influenced by climate. The effects on parasite transmission were undertaken by comparing parasite prevalences in the principal definitive hosts, the common shrew (Sorex araneus) and the wood mouse (Apodemus sylvaticus) in the same habitat over the period 1973–1983. Changes in parasite prevalences in the molluscan population were rarely replicated by changes in the small mammal population, except for trematode parasites in small mammals during a period of severe drought in 1976. These results suggest that only long-term persistent modifications in climate are likely to affect host–parasite dynamics.

Type
Research Papers
Information
Journal of Helminthology , Volume 82 , Issue 4 , December 2008 , pp. 325 - 335
Copyright
Copyright © Cambridge University Press 2008

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