Abstract
The population dynamics of beaver was studied in SE Ohio from 1974 to 1978. All members of a local population were marked. Family units were a closed social system consisting of a monogamous adult pair, yearlings and kits. Two-year-old beaver dispersed from their natal site in the spring of their third summer of life. The average family unit size prior to dispersal was 5.85, between dispersal and birth of kits was 4.09, and after the birth of kits 6.04. Average annual litter size was 2.7. Litter size varied among years but not among family units. Outbreeding was the rule, only one parentprogeny pair bond formed after the over-winter loss of the adult male. This pair bond lasted only one breeding season, however. Members of each family unit remained together throughout the year and all members, including the adult male, participated in care of the kits.
Published Version
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