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Population genetic structure of the prairie dog flea and plague vector, Oropsylla hirsuta

Published online by Cambridge University Press:  10 August 2010

R. JORY BRINKERHOFF ,
ANDREW P. MARTIN ,
RYAN T. JONES  and
SHARON K. COLLINGE
R. JORY BRINKERHOFF*
Affiliation:
Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, 80309-0334, USA
ANDREW P. MARTIN
Affiliation:
Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, 80309-0334, USA
RYAN T. JONES
Affiliation:
Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, 80309-0334, USA
SHARON K. COLLINGE
Affiliation:
Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, 80309-0334, USA Environmental Studies Program, University of Colorado, 334 UCB, Boulder, CO, 80309-0334, USA
*
*Corresponding author: Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, 80309-0334, USA. Tel: +203 785 2272. Fax: +203 785 3604. E-mail: [email protected]
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Summary

Oropsylla hirsuta is the primary flea of the black-tailed prairie dog and is a vector of the plague bacterium, Yersinia pestis. We examined the population genetic structure of O. hirsuta fleas collected from 11 prairie dog colonies, 7 of which had experienced a plague-associated die-off in 1994. In a sample of 332 O. hirsuta collected from 226 host individuals, we detected 24 unique haplotype sequences in a 480 nucleotide segment of the cytochrome oxidase II gene. We found significant overall population structure but we did not detect a signal of isolation by distance, suggesting that O. hirsuta may be able to disperse relatively quickly at the scale of this study. All 7 colonies that were recently decimated by plague showed signs of recent population expansion, whereas 3 of the 4 plague-negative colonies showed haplotype patterns consistent with stable populations. These results suggest that O. hirsuta populations are affected by plague-induced prairie dog die-offs and that flea dispersal among prairie dog colonies may not be dependent exclusively on dispersal of prairie dogs. Re-colonization following plague events from plague-free refugia may allow for rapid flea population expansion following plague epizootics.

Keywords

disease ecologydispersalpathogen transmissionreservoir hostSiphonapteraYersinia pestis
Type
Research Article
Information
Parasitology , Volume 138 , Issue 1 , January 2011 , pp. 71 - 79
Copyright
Copyright © Cambridge University Press 2010

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