Population Densities and Disease Surveys of Wild Pigs in the Coast Ranges of Central and Northern California

Authors

Rick A. Sweitzer, University of California - DavisFollow
Ian A. Gardner, University of California - DavisFollow
Ben J. Gonzales, Arizona Department of Fish and Game
Dirk Van Vuren, University of California - DavisFollow
Walter M. Boyce, University of California - DavisFollow

Date of this Version

1996

Document Type

Article

Citation

Published in Proceedings: Seventeenth Vertebrate Pest Conference … 1996, ed. Robert M. Timm & A. Charles Crabb (University of California, Davis, 1996).

Comments

Copyright © 1996 (where applicable) by the Vertebrate Pest Council of the Vertebrate Pest Conference. Used by permission.

Abstract

In 1994 and 1995, 233 different wild pigs were captured during population research at seven research sites focused primarily in the coastal regions of central and northern California. Mark-resight data and information on wild pig movements were used to assess wild pig population densities at those sites. Population densities ranged from 1.01 wild pigs/km² in Mendocino County in 1994 to 3.32 wild pigs/km² in Santa Clara County in 1995. Comparisons of population densities between years at three research sites suggested that wild pig populations increased in 1995 in response to favorable forage conditions after the wet fall and winter of 1994-95. Serum samples collected from 462 wild pigs at 28 different sites were screened for exposure to brucellosis and pseudorabies. Preliminary results were that seropositive results for brucellosis were noted at only three sites, whereas no animals were confirmed seropositive for pseudorabies. Although analyses of these two diseases are continuing, test results for trichinellosis, toxoplasmosis, and sylvatic plague reinforce previous warnings to hunters and consumers that sanitary handling and cooking of wild swine meat are warranted.