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Rumen metabolites serve ticks to exploit large mammals
Gérard Donzé1, Conor McMahon, Patrick M Guerin
1Institute of Zoology, University of Neuchâtel, Rue Emile-Argand 11, 2007 Neuchatel, Switzerland.
The Journal of Experimental Biology
|November 9, 2004
Summary
Hard ticks are attracted to the smell of rumen metabolites, like carboxylic acids, phenols, and indoles, produced by ruminants. This attraction helps these ectoparasites locate their preferred large mammal hosts for blood meals.
Area of Science:
- Zoology
- Parasitology
- Chemical Ecology
Background:
- Hard ticks require blood meals for development and rely on host-derived cues for detection.
- Ruminants, a primary host group for adult ticks, produce volatile compounds during digestion and eructation.
Purpose of the Study:
- To investigate if hard ticks are attracted to rumen metabolites.
- To identify specific volatile compounds from rumen fluid that attract ticks.
- To understand the olfactory basis of tick-host interactions.
Main Methods:
- Testing the olfactory responses of adult hard tick species to rumen fluid and its volatile components.
- Gas chromatography-electroantennographic detection (GC-EAD) to identify attractive volatile compounds.
- Behavioral assays to assess tick attraction to individual compounds and mixtures.
Main Results:
- All tested adult hard tick species showed attraction to rumen fluid (cud).
- Ticks possess olfactory receptor cells sensitive to carboxylic acids, phenols, and indoles.
- These compound classes, individually and in mixtures mimicking rumen composition, attracted ticks.
Conclusions:
- Tick attraction to rumen metabolites is a key adaptation for locating large ungulate hosts.
- Specific volatile compounds from ruminant digestion serve as crucial host-finding cues for hard ticks.