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Causes and rates of mortality of swift foxes in western Kansas

January 1, 1998

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 (5 ?? 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.

Citation Information

Publication Year 1998
Title Causes and rates of mortality of swift foxes in western Kansas
DOI 10.2307/3801994
Authors M.A. Sovada, C.C. Roy, J.B. Bright, J.R. Gillis
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Wildlife Management
Series Number
Index ID 70020078
Record Source USGS Publications Warehouse
USGS Organization Northern Prairie Wildlife Research Center