den selection, Iowa, Procyon lotor, raccoon, survival estimation
We measured post-natal survival of radio-collared raccoons 1-5 months old in southwest Iowa, 1988-1989. We compared survival of young nurtured by yearling and adult females and related den site selection to survival functions using proportional hazards models. Adult females used upland and farmstead habitats note frequently than yearlings, whereas yearling females used lowland habitats note frequently. Tree cavities and beds on the ground were used most frequently. Adult females denned in buildings 13% of the time and in holes in the ground 9.5% of the time, whereas yearlings frequently tested with litters in beds on the ground (31%). Microhab1tat characteristics including such factors as tree size, surrounding vegetation, and den characteristics had no influence on use. We observed 9 mortalities of 64 earmarked young, 4 caused by dogs, the remaining including vehicle collisions, predation, and disease. All mortalities occurred after litters moved from their natal den to a post-natal den site. We could not show significant differences in survival of young nurtured by yearling and adult females and the best estimate of post-natal survival of raccoons from 22 May to 15 September was 0.65. Post-natal survival was positively influenced by the variety of habitats and den types used by females and their young. Denning habitat selection and post-natal survival of young, particularly those of adult females, may have an important influence on population levels.
Journal of the Iowa Academy of Science
© Copyright 1994 by the Iowa Academy of Science, Inc.
Judson, Jonathan J.; Clark, William R.; and Andrews, Ronald D.
"Post-natal Survival of Raccoons in Relation to Female Age and Denning Behavior,"
The Journal of the Iowa Academy of Science: JIAS: Vol. 101:
, Article 7.
Available at: http://scholarworks.uni.edu/jias/vol101/iss1/7