Cooperative Research Units
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Limitations to the northernmost distribution of Virginia opossums


December 2000 - September 2008


Limitations to the distribution of a species are poorly understood, though this information is critical to understanding the abundance and distribution of organisms. We examined the biophysical limits to the northernmost distribution of Virginia opossums, by examining conditions near Amherst, Massachusetts, where opossums recently expanded their range.
In combination with energetic modeling, we have shown that opossums are only able to exist in the Amherst region if they are near human developments where the microclimate is moderated, and food availability is increased. Our findings are useful in understanding how opossums have been able to successfully expand their range as far north as Canada, and have applications to predicting range expansions under global warming scenarios.


Current Staff

Federal Staff: 95

Masters Students: 239

Phd Students: 144

Post Docs: 55

University Staff: 239

5 Year Summary

Students graduated: 669

Scientific Publications: 1897

Presentations: 4197



  • Paul SievertCo-Principal Investigator

Funding Agencies

  • University of Massachusetts Amherst


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey