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Oecologia

, Volume 149, Issue 3, pp 474–481 | Cite as

Ecological characteristics of flea species relate to their suitability as plague vectors

  • Boris R. KrasnovEmail author
  • Georgy I. Shenbrot
  • David Mouillot
  • Irina S. Khokhlova
  • Robert Poulin
Community Ecology

Abstract

The ability of vector-borne diseases to persist and spread is closely linked to the ecological characteristics of the vector species they use. Yet there have been no investigations of how species used as vectors by pathogens such as the plague bacterium differ from closely related species that are not used as vectors. The plague bacterium uses mammals as reservoir hosts and fleas as vectors. The ability of different fleas to serve as vectors is assumed to depend on how likely they are to experience gut blockage following bacterial multiplication; the blockage causes fleas to regurgitate blood into a wound and thus inject bacteria into new hosts. Beyond these physiological differences, it is unclear whether there exist fundamental ecological differences between fleas that are effective vectors and those that are not. Here, using a comparative analysis, we identify clear associations between the ability of flea species to transmit plague and their ecological characteristics. First, there is a positive relationship between the abundance of flea species on their hosts and their potential as vectors. Second, although the number of host species exploited by a flea is not associated with its potential as a vector, there is a negative relationship between the ability of fleas to transmit plague and the taxonomic diversity of their host spectrum. This suggests a correlation between some ecological characteristics of fleas and their ability to develop the plague blockage. The plague pathogen thus uses mainly abundant fleas specialized on a narrow taxonomic range of mammals, features that should maximize the persistence of the disease in the face of high flea mortality, and its transmission to suitable hosts only. This previously unrecognized pattern of vector use is of importance for the persistence and transmission of the disease.

Keywords

Abundance Fleas Host specificity Plague transmission Yersinia pestis 

Notes

Acknowledgements

We thank Kenneth Gage and two anonymous referees for helpful comments on the earlier draft of the manuscript. This is publication no. 201 of the Ramon Science Center and no. 510 of the Mitrani Department of Desert Ecology.

Supplementary material

442_2006_455_MOESM1_ESM.pdf (225 kb)
Supplementary material

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Boris R. Krasnov
    • 1
    Email author
  • Georgy I. Shenbrot
    • 1
  • David Mouillot
    • 2
  • Irina S. Khokhlova
    • 3
  • Robert Poulin
    • 4
  1. 1.Ramon Science Center and Mitrani Department of Desert Ecology, Jacob Blaustein Institutes for Desert ResearchBen-Gurion University of the NegevMidreshet Ben-GurionIsrael
  2. 2.UMR CNRS-UMII 5119 Ecosystemes LagunairesUniversity of Montpellier IIMontpellier Cedex 5France
  3. 3.Wyler Department of Dryland Agriculture, Jacob Blaustein Institutes for Desert ResearchBen-Gurion University of the NegevMidreshet Ben-GurionIsrael
  4. 4.Department of ZoologyUniversity of OtagoDunedinNew Zealand

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