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1 January 2015 Conspecific Aggression by Beavers (Castor canadensis) in the Sangamon River Basin in Central Illinois: Correlates with Habitat, Age, Sex and Season
Joanne C. Crawford
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Abstract

Conspecific aggression may play an important role in partitioning resources and maintaining territories among beavers (Castor canadensis), yet few studies have examined physical evidence of agonistic encounters. We trapped and examined pelts from 147 beavers harvested between 2006 and 2012 from the Sangamon River (n  =  96) and tributary streams (n  =  51) in central Illinois. We modeled the influence of sex, age class, season (predispersal or dispersal), and habitat (river or tributary stream) on the number of recent injuries caused by conspecifics. One-third (51/147) of beavers had ≥1 injury; of those, the median number of injuries was 2.0. Kits had fewer injuries than adults (βKit  =  −2.24 ± 0.63), but yearlings and subadults did not (βyearling  =  0.02 ± 0.38, βsubadult  =  −0.22 ± 0.48). Beavers on small streams had only one-quarter of the injuries recorded for beavers on the river (βStream  =  −1.34 ± 0.82). We failed to detect differences in injuries between the sexes. Our results suggest both sexes participate in territorial defense through physical confrontations and such encounters can be costly to both dispersing juveniles and resident adults.

2014, American Midland Naturalist
Joanne C. Crawford "Conspecific Aggression by Beavers (Castor canadensis) in the Sangamon River Basin in Central Illinois: Correlates with Habitat, Age, Sex and Season," The American Midland Naturalist 173(1), 145-155, (1 January 2015). https://doi.org/10.1674/0003-0031-173.1.145
Received: 14 January 2014; Accepted: 1 August 2014; Published: 1 January 2015
JOURNAL ARTICLE
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