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Population regulation in ticks: the role of acquired resistance in natural and unnatural hosts

Published online by Cambridge University Press:  06 April 2009

Sarah E. Randolph
Sarah E. Randolph
Affiliation:
Department of Zoology, South Parks Road, Oxford
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Summary

Attachment, engorgement and subsequent development of successive infestations of Ixodes trianguliceps larvae and nymphs on natural hosts, Apodemus sylvaticus, and unnatural hosts, laboratory mice, are compared. In laboratory mice, primary infestations above a threshold level of about 10 ticks elicit an immunological response which reduces, in a density-dependent manner, the rate of successful tick engorgement during subsequent infestations. In contrast, in A. sylvaticus successive infestations of larvae result in unchanged or slightly improved survival through to nymphs. The relevance of these results to the concept of host-parasite co-evolution and to tick population regulation is discussed.

Type
Research Article
Information
Parasitology , Volume 79 , Issue 1 , August 1979 , pp. 141 - 156
Copyright
Copyright © Cambridge University Press 1979

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