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Comparison of the survival of Theileria parva-infected adult Rhipicephalus appendiculatus (Acari: Ixodidae) and their infection under simulated climate conditions in the laboratory and in the field

Published online by Cambridge University Press:  28 February 2007

H. Ochanda
H. Ochanda*
Affiliation:
Department of Zoology, University of Nairobi, PO Box 30197-00100, Nairobi, Kenya
*
*Email: [email protected]
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Abstract

Five groups of adult Rhipicephalus appendiculatus Neumann, with an average of 98 Theileria parva-infected salivary gland acini per tick, were exposed to four different temperature conditions in the laboratory or to quasi-natural conditions in Kenya. The survival of the infected ticks and T. parva parasites in their salivary glands were determined over time. Ticks kept under quasi-natural conditions survived up to 86 weeks. This period was longer than that of ticks exposed to any of the four laboratory conditions, except the diurnal temperature rhythm of 13–23 °C and 85% relative humidity (RH) to which it was comparable. Theileria parva survived for 82 weeks in ticks exposed to quasi-natural conditions, a period which was much longer than that of the parasites in ticks maintained under any of the laboratory conditions. Survival of the infected ticks and their infections seemed to be adversely affected by higher temperatures in the laboratory or drought in the field. There was an apparent density-dependent influence in parasite survival, with a dramatic fall in infection occurring in the more highly infected ticks before stabilizing at lower levels.

Keywords

Theileria parvaRhipicephalus appendiculatusquasi-natural conditionslaboratory environmental conditionssurvivaldensity dependence
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 26 , Issue 2 , June 2006 , pp. 101 - 107
Copyright
Copyright © ICIPE 2006

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