Prey abundance and food habits of San Joaquin kit fox (Vulpes velox macrotis) at Camp Roberts Army National Guard Training Site, California
by: Christopher G. Logan, William H. Berry, William G. Standley, and Thomas T. Kato
ABSTRACT: Prey abundance and food habits of the San Joaquin kit fox (Vulpes velox macrotis) were investigated at Camp Roberts Army National Guard Training Site, California, from November 1988 through September 1991. The sampling methods initially used to assess abundance of prey species resulted in indices too low to be of value. Because of this, the relationship between relative abundance and frequency of occurrence of prey species could not be examined. Six hundred forty-nine fecal samples (scats) were analyzed to determine the frequency of occurrence of prey items. California ground squirrels (Spermophilus beecheyi) and lagomorphs (primarily desert cottontails (Sylvilagus audubonii) and black-tailed jackrabbits (Lepus californicus)) were the most frequently occurring mammalian prey items found in scats (35.0% and 12.2%, respectively). The frequency of occurrence of ground squirrel (but not lagomorph) remains in scats collected from juveniles was significantly higher than in scats collected from adults. The frequency of occurrence of ground squirrel and lagomorph remains in scats collected from males was not significantly different than in scats collected from females. There were significant variations in the frequency of ground squirrel remains among the years 1989-1991 and during June-November periods between 1989 and 1990 and between 1990 and 1991. The frequency of lagomorph remains collected during the June-November period differed significantly among the years 1989-1991 and between 1990 and 1991.
1992. U. S. Dept. of Energy Topical Report, EG&G/EM Santa Barbara Operations Report No. EGG 10617-2158. 21 pp. Reprints are available from the National Technical Information Service, U.S. Department of Commerce, 5285 Port Royal Road, Springfield, VA 22161.
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