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17 February 2010 Estimates of dispersal and home-range fidelity in American black bears
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Abstract

I examined dispersal, home-range establishment, and home-range fidelity in American black bears (Ursus americanus) using radiotelemetry data for individuals whose natal ranges were known (n  =  43), individuals whose natal ranges were identified using microsatellite DNA (n  =  13), and individuals whose natal ranges were unknown (n  =  86). Dispersal was highly male-biased. Nearly all males emigrated 22–62 km from their natal ranges between the ages of 1 and 3 years. Some males continued to float, moving their ranges 15–68 km between successive years. Most males settled into a permanent home range by age 4 years, and all males settled by age 7 years. One 8-year-old male apparently did not disperse and resided only 7 km from his natal range. Females were more philopatric and settled 0–7 km from their natal ranges. Only 1 female moved her range >20 km at the age of 5 years. The adaptive significance of male-biased natal dispersal is discussed.

Cecily M. Costello "Estimates of dispersal and home-range fidelity in American black bears," Journal of Mammalogy 91(1), 116-121, (17 February 2010). https://doi.org/10.1644/09-MAMM-A-015R1.1
Received: 16 January 2009; Accepted: 1 July 2009; Published: 17 February 2010
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