Abstract

1. 1. The paper describes evolutionary differences in energetics between the raccoon dogs originated from islands (Japan) and mainlands (eastern Asia). 2. 2. The Japanese raccoon dog is specialized to live in a temperate marine climate; it has a stomach of small volume, thin fur coat with low insulation, specialized diet and a poor ability to alter its body energy reserves seasonally. 3. 3. The raccoon dog living in mainland is more generalized, and thus also well-adapted to survive extreme climate of northern latitudes. 4. 4. The results confirm the previous conclusions made from chromosomal analyses that the Japanese raccoon dog has evolved from the mainland form.

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