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Obligate larval inhibition of Ostertagia gruehneri in Rangifer tarandus? Causes and consequences in an Arctic system

Published online by Cambridge University Press:  06 September 2012

BRYANNE M. HOAR ,
ALEXANDER G. EBERHARDT  and
SUSAN J. KUTZ
BRYANNE M. HOAR*
Affiliation:
Department of Biological Sciences, University of Calgary, Calgary, Canada Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
ALEXANDER G. EBERHARDT
Affiliation:
Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada Kriminaltechnisches Institut, Landeskriminalamt Baden-Württemberg, Germany
SUSAN J. KUTZ
Affiliation:
Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
*
*Corresponding author: 3350 Hospital Dr NW, Calgary, AB, CanadaT2N 4N1. Tel: +1 902 217 6468. E-mail: bmhoar@ucalgary.ca
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Summary

Larval inhibition is a common strategy of Trichostrongylidae nematodes that may increase survival of larvae during unfavourable periods and concentrate egg production when conditions are favourable for development and transmission. We investigated the propensity for larval inhibition in a population of Ostertagia gruehneri, the most common gastrointestinal Trichostrongylidae nematode of Rangifer tarandus. Initial experimental infections of 4 reindeer with O. gruehneri sourced from the Bathurst caribou herd in Arctic Canada suggested that the propensity for larval inhibition was 100%. In the summer of 2009 we infected 12 additional reindeer with the F1 and F2 generations of O. gruehneri sourced from the previously infected reindeer to further investigate the propensity of larval inhibition. The reindeer were divided into 2 groups and half were infected before the summer solstice (17 June) and half were infected after the solstice (16 July). Reindeer did not shed eggs until March 2010, i.e. 8 and 9 months post-infection. These results suggest obligate larval inhibition for at least 1 population of O. gruehneri, a phenomenon that has not been conclusively shown for any other trichostrongylid species. Obligate inhibition is likely to be an adaptation to both the Arctic environment and to a migratory host and may influence the ability of O. gruehneri to adapt to climate change.

Keywords

Ostertagia gruehnerilarval inhibitionparasiteRangifer tarandusArctic
Type
Research Article
Information
Parasitology , Volume 139 , Issue 10 , September 2012 , pp. 1339 - 1345
Copyright
Copyright © Cambridge University Press 2012

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