EcoHealth

, Volume 2, Issue 2, pp 102–112 | Cite as

Testing the Generality of a Trophic-cascade Model for Plague

  • Sharon K. Collinge
  • Whitney C. Johnson
  • Chris Ray
  • Randy Matchett
  • John Grensten
  • Jack F. CullyJr.
  • Kenneth L. Gage
  • Michael Y. Kosoy
  • Jenella E. Loye
  • Andrew P. Martin
Article

Abstract

Climate may affect the dynamics of infectious diseases by shifting pathogen, vector, or host species abundance, population dynamics, or community interactions. Black-tailed prairie dogs (Cynomys ludovicianus) are highly susceptible to plague, yet little is known about factors that influence the dynamics of plague epizootics in prairie dogs. We investigated temporal patterns of plague occurrence in black-tailed prairie dogs to assess the generality of links between climate and plague occurrence found in previous analyses of human plague cases. We examined long-term data on climate and plague occurrence in prairie dog colonies within two study areas. Multiple regression analyses revealed that plague occurrence in prairie dogs was not associated with climatic variables in our Colorado study area. In contrast, plague occurrence was strongly associated with climatic variables in our Montana study area. The models with most support included a positive association with precipitation in April–July of the previous year, in addition to a positive association with the number of “warm” days and a negative association with the number of “hot” days in the same year as reported plague events. We conclude that the timing and magnitude of precipitation and temperature may affect plague occurrence in some geographic areas. The best climatic predictors of plague occurrence in prairie dogs within our Montana study area are quite similar to the best climatic predictors of human plague cases in the southwestern United States. This correspondence across regions and species suggests support for a (temperature-modulated) trophic-cascade model for plague, including climatic effects on rodent abundance, flea abundance, and pathogen transmission, at least in regions that experience strong climatic signals.

Key words

climate disease grassland plague prairie dogs trophic cascade 

Notes

Acknowledgments

We gratefully acknowledge the City of Boulder Open Space Department, and Boulder County Parks and Open Space Department, particularly Mark Gershman, Cary Richardson, Bryan Pritchett, Lynn Riedel, Mark Brennan, Ann Wickman, and Jeanne Scholl for providing data on plague occurrence and information on prairie dog colonies in Boulder County. Brian Holmes helped assemble plague occurrence and prairie dog colony data in Phillips County, Montana. Sue Rodriguez-Pastor helped gather plague data from Boulder land management agencies. This research was supported by a grant (R-82909101-0) from the National Center for Environmental Research (NCER) STAR program of the US-EPA, and a grant from the NSF/NIH joint program in Ecology of Infectious Diseases (DEB-0224328).

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Copyright information

© EcoHealth Journal Consortium 2005

Authors and Affiliations

  • Sharon K. Collinge
    • 1
    • 2
    • 8
  • Whitney C. Johnson
    • 1
  • Chris Ray
    • 1
  • Randy Matchett
    • 3
  • John Grensten
    • 4
  • Jack F. CullyJr.
    • 5
  • Kenneth L. Gage
    • 6
  • Michael Y. Kosoy
    • 6
  • Jenella E. Loye
    • 7
  • Andrew P. Martin
    • 1
  1. 1.Department of Ecology and Evolutionary Biology, 334 UCBUniversity of ColoradoBoulder
  2. 2.Environmental Studies Program, 334 UCBUniversity of ColoradoBoulder
  3. 3.Charles M. Russell National Wildlife RefugeU.S. Fish and Wildlife ServiceLewistown
  4. 4.Malta Field OfficeBureau of Land ManagementMalta
  5. 5.Kansas Cooperative Fish and Wildlife Research Unit, United States Geological Survey, 204 Leasure HallKansas State UniversityManhattan
  6. 6.Bacterial Zoonoses Branch, Division of Vector-Borne Infectious DiseasesCenters for Disease Control and PreventionFort Collins
  7. 7.Department of EntomologyUniversity of CaliforniaDavis
  8. 8.Department of Ecology and Evolutionary Biology, Environmental Studies Program, 334 UCBUniversity of ColoradoBoulder

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