Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Vital Statistics and Harvest of an Iowa Raccoon Population

William R. Clark, James J. Hasbrouck, James M. Kienzler and Thomas F. Glueck
The Journal of Wildlife Management
Vol. 53, No. 4 (Oct., 1989), pp. 982-990
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3809599
Stable URL: http://www.jstor.org/stable/3809599
Page Count: 9
  • Download ($42.00)
  • Subscribe ($19.50)
  • Cite this Item
Vital Statistics and Harvest of an Iowa Raccoon Population
Preview not available

Abstract

We studied reproduction, survival, and dispersal of an exploited raccoon (Procyon lotor) population in Iowa farmlands during 1982-86. Mean pregnancy rate of yearlings was 59%, significantly less than the 91% observed among animals ≥2 years old. Pregnancy rate was best predicted by a logistic regression function of age, carcass weight, and their interaction. Litter size of 3.1 young/yearling female, was significantly less than the 3.8 young/adult female. We found no differences in survival of yearlings and older raccoons or between males and females. A single rate adequately represented survival of all raccoons during the nonharvest seasons (Jan-Oct). Juvenile survival, from age 4 months through the end of the harvest season, ranged from 0.37 to 0.78. Annual survival of adults ranged from 0.47 to 0.75. Harvest and vehicle accidents accounted for 78 and 10% of all recoveries, respectively. Juvenile and adult survival were not significantly different during any of the harvest seasons. Eighty nine percent of the harvest occurred in the first month of the open season. We estimated maximum potential harvest to be 41% of the preharvest population; observed harvest was 32%. There is potential for density-dependent compensation among mortality sources during the harvest season, in mortality among young and adults in following seasons, and in reproduction.

Page Thumbnails

  • Thumbnail: Page 
982
    982
  • Thumbnail: Page 
983
    983
  • Thumbnail: Page 
984
    984
  • Thumbnail: Page 
985
    985
  • Thumbnail: Page 
986
    986
  • Thumbnail: Page 
987
    987
  • Thumbnail: Page 
988
    988
  • Thumbnail: Page 
989
    989
  • Thumbnail: Page 
990
    990