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Growth, Sexual Dimorphism, and Geographical Variation of Skull Dimensions of the Brown Bear Ursus arctos in Hokkaido

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Title: Growth, Sexual Dimorphism, and Geographical Variation of Skull Dimensions of the Brown Bear Ursus arctos in Hokkaido
Authors: Ohdachi, Satoshi Browse this author →KAKEN DB
Aoi, Toshiki Browse this author
Mano, Tsutomu Browse this author
Tsubota, Toshio Browse this author
Keywords: Growth
Sexual dimorphism
Bergman's rule
Brown bear
Issue Date: May-1992
Publisher: Mammalogical Society of Japan
Journal Title: Journal of the Mammalogical Society of Japan
Volume: 17
Issue: 1
Start Page: 27
End Page: 47
Abstract: The growth, sexual dimorphism, and geographical variation in skulls of 596 brown bears (Ursus arctos) hunted in Hokkaido, Japan from 1971 to 1986 were investigated. Most cranial traits continued to increase after the age of sexual maturity, and in particular skulls became progressively wider with age. Skulls of males, even those of cubs and yearlings, were larger than those of females, and the difference became significant after two years of age. Skull dimensions tended to increase from south to north, in Hokkaido, and bears from the north-eastern region possessed higher brain cases and longer mandibles relative to skull length and width, than those in the southern region.
Type: article
URI: http://hdl.handle.net/2115/44439
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大舘 智志

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