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Causes and Rates of Mortality of Swift Foxes in Western Kansas

Marsha A. Sovada, Christiane C. Roy, J. B. Bright, and James R. Gillis


Abstract:  Knowledge of mortality factors is important for developing strategies to conserve the swift fox (Vulpes velox), a species being considered for listing under the Endangered Species Act, but available information about swift fox mortality is inadequate. We used radiotelemetry techniques to examine the magnitude and causes of mortality of swift fox populations in 2 study areas in western Kansas. One study area was predominantly cropland, the other rangeland. Mortality rates, calculated using Kaplan-Meier estimation techniques in a staggered entry design, were 0.55 ± 0.08 (Mean of X ± SE) for adult and 0.67 ± 0.08 for juvenile swift foxes. We did not detect differences between study areas in mortality rates for adults or juveniles. Predation by coyotes (Canis latrans) was the major cause of mortality for adult and juvenile swift foxes in both study areas, and vehicle collision was an important mortality factor for juveniles in the cropland study area. No mortality was attributed to starvation or disease.

Key Words:  Canis latrans, coyote predation, interspecific competition, Kansas, mortality factors, mortality rates, swift fox, Vulpes velox.


This resource is based on the following source (Northern Prairie Publication 1040):

Sovada, Marsha A., Christiane C. Roy, J. B. Bright, and James R. Gillis.  1998.  Causes and rates of mortality of swift foxes in western Kansas.  Journal of Wildlife Management 62(4):1300-1306.

This resource should be cited as:

Sovada, Marsha A., Christiane C. Roy, J. B. Bright, and James R. Gillis.  1998.  Causes and rates of mortality of swift foxes in western Kansas.  Journal of Wildlife Management 62(4):1300-1306.  Northern Prairie Wildlife Research Center Online.  http://www.npwrc.usgs.gov/resource/mammals/foxmort/index.htm (Version 04DEC1997).


Table of Contents


Marsha A. Sovada, J. B. Bright, and James R. Gillis, U.S. Geological Survey, Northern Prairie Wildlife Research Center, 8711 37th Street SE, Jamestown, ND 58401, USA
Christiane C. Roy, Kansas Department of Wildlife and Parks, Emporia, KS 66801, USA

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