USGS - science for a changing world

Northern Prairie Wildlife Research Center

  Home About NPWRC Our Science Staff Employment Contacts Common Questions About the Site

Swift Fox Symposium

An Investigation into the Causes of Mortality in a Reintroduced Free Ranging Swift Fox (Vulpes velox) Population 1997.


Sandra R. Black1, Axel Moehrenschlager2, and Ludwig N. Carbyn3. 1Veterinary Services, Calgary Zoo, PO Box 3036, Station B Calgary, AB T2M 4R8. 2Wildlife Conservation Unit, Department of Zoology, Oxford University, South Park Road, Oxford 0X1 3P2, England. 3Canadian Wildlife Service, 4999 - 98 Avenue, Edmonton, AB T6B 2X3.

During a radio collaring study of a reintroduced swift fox population, carcasses of deceased foxes were collected and thorough necropsy examinations undertaken. A total of 48 carcasses were collected by field workers in the southeastern area of Alberta, and the southwestern area of Saskatchewan, Canada. All carcasses were examined grossly; histological examination was also undertaken for those which were not severely autolysed or depredated. Foxes were aged by a tooth sectioning technique. Stomach contents were collected to determine food sources, which varied from insects (used heavily by young foxes in the summer and early fall) to small mammals and carrion. Field data and necropsy findings were used to elucidate the cause of death, with trauma being by far the most common. Trauma due to predation was widespread with coyotes, eagles and occasionally badgers being the suspected predators. Vehicular trauma was a significant cause of death, especially in young of the year foxes. Most animals examined were in good body condition; suspected starvation was rare and associated with the stress of release in one case, and a jaw fracture in another. Incidental findings included parasitism by ticks and intestinal ascarids.


Previous Section -- An Overview of Reproductive Processes in Small Canids
Return to Contents
Next Section -- Diet and Hunting Behaviour of Captive-bred Swift Fox

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/mammals/swiftfox/page4.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 05:58:59 EST
Sioux Falls, SD [sdww54]