Robust molecular sex identification of beaver (Castor canadensis) from non-destructive samples

Goldberg, Caren S.; Woodruff, Kent; Toldness, Rachael; Waits, Lisette P.

doi:10.1007/s12686-011-9443-2

Cited by 3 publications

(2 citation statements)

References 12 publications

(17 reference statements)

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“…As the age of each specimen was almost never available, we developed a custom key based on wear patterns of the molars and developmental features of the skull designed to distinguish adult specimens from juveniles and categorizing skulls into five age stages (i.e., 1‐juvenile, 2‐sub adult, 3‐young adult, 4‐mid‐life adult, and 5‐old adult) without the need for destructive sampling (Appendix S2). Skulls of both sexes were pooled, as beavers are not known to exhibit sexual dimorphism in their cranial morphology (Bond, 1956; Goldberg et al., 2011; Jenkins & Busher, 1979).…”

Section: Methodsmentioning

confidence: 99%

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Chipping in: functional morphology of the American beaver under range expansion

Diamond,

Humphries,

Millien

2023

Journal of Zoology

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Climate warming combined with intensive human activities are modifying ecosystems globally, and the Arctic biota is shifting substantially faster than the global average, allowing many new species to expand their range poleward. One such species, is the American beaver (Castor canadensis), a highly specialized rodent capable of greatly modifying ecosystems by altering forest composition through selective foraging and by flooding the landscape through dam and channel building. As rodent cranial morphology is highly related to its functional requirements for foraging and feeding, the beaver provides an opportunity to evaluate the phenotypic response of species to changing environmental conditions. Here, we test the hypothesis that beaver skull morphology is optimized for its local environmental and habitat conditions across Canadian ecosystems. We found that temperature, precipitations, biomass, and local average tree hardness significantly affect the morphology of key masticatory functional traits of the skull, but not its size. Our results suggest that the beaver's phenotype is locally adapted to environmental conditions as a result of its selective foraging behavior. This work provides insight into the adaptive potential of newly established beaver populations in the sub‐Arctic to inform management strategies for this keystone species. More generally, our work emphasizes the need to consider traits other than body size in research seeking to better understand the response of species to current global change.

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Section: Methodsmentioning

confidence: 99%

“…sampling (Appendix S2). Skulls of both sexes were pooled, as beavers are not known to exhibit sexual dimorphism in their cranial morphology (Bond, 1956;Goldberg et al, 2011;Jenkins & Busher, 1979).…”

Section: Specimensmentioning

confidence: 99%