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Tick ecology: processes and patterns behind the epidemiological risk posed by ixodid ticks as vectors

Published online by Cambridge University Press:  19 April 2005

S. E. RANDOLPH
S. E. RANDOLPH
Affiliation:
Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
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Abstract

The population ecology of ticks is fundamental to the spatial and temporal variation in the risk of infection by tick-borne pathogens. Tick population dynamics can only be fully understood by quantifying the rates of the demographic processes, which are influenced by both abiotic (climatic) factors acting on the free-living tick stages and biotic (host) responses to the tick as a parasite. Within the framework of a population model, I review methods and results of attempts to quantify (1) rates of tick development and the probability of diapause, (2) the probability of questing for hosts by unfed ticks, (3) the probability of ticks attaching to a host, and (4) tick mortality rates. Biologically, these processes involve the physiological and behavioural response of ticks to temperature, moisture stress and day length that result in specific patterns of seasonal population dynamics and host relationships. Temperate and tropical patterns will be illustrated with reference mostly to Ixodes ricinus and Rhipicephalus appendiculatus, respectively.

Keywords

Ticksecologyepidemiologydemographic processespopulation models

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Type
Research Article
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Parasitology , Volume 129 , Issue S1 , October 2004 , pp. S37 - S65
Copyright
© 2004 Cambridge University Press

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