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First published online November 5, 2004
Journal of Experimental Biology 207, 4283-4289 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01241

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Rumen metabolites serve ticks to exploit large mammals

Gérard Donzé, Conor McMahon and Patrick M. Guerin^*

Institute of Zoology, University of Neuchâtel, Rue Emile-Argand 11, 2007 Neuchatel, Switzerland

^* Author for correspondence (e-mail: patrick.guerin{at}unine.ch)

Accepted 14 August 2004

Hard ticks spend most of their life isolated from passing vertebrates but require a blood meal to proceed to the next life stage (larva, nymph or adult). These opportunist ectoparasites must be capable of anticipating signals that render suitable hosts apparent. Large ungulates that tolerate a high ectoparasite burden are the favoured hosts of adult hard ticks. Ruminants, comprising the majority of ungulate species, must regularly eruct gases from the foregut to relieve excess pressure and maintain a chemical equilibrium. Through eructations from individuals, and particularly herds, ruminants inadvertently signal their presence to hard ticks. Here, we report that all adult hard tick species we tested are attracted to cud and demonstrate that these acarines possess olfactory receptor cells for the carboxylic acid, phenol and indole end-products of the rumen bioreactor. Compounds from each of these classes of volatiles attract ticks on their own, and mixtures of these volatiles based on rumen composition also attract. Appetence for rumen metabolites represents a fundamental resource-tracking adaptation by hard ticks for large roaming mammals.

Key words: tick, ectoparasite, rumen, behaviour, neurophysiology, rumen metabolite, Amblyomma, Ixodes

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