Convergence of Solar Heat Gain in Two Squirrel Species with Contrasting Coat Colors

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Abstract
Two otherwise similar species of golden-mantled ground squirrels differ in coloration; the dorsal fur of Spermophilus lateralis exhibits a reflectivity to solar radiation 58% greater than does that of S. saturatus. Despite this substantial difference in coloration, however, solar heat loads transferred to the skin are indistinguishable. This convergence of radiative heat gain results primarily from differences in the structure, optics, and thickness of fur beneath the superficial layer that produces the animal's external appearance. The results of this research support the view that coat properties modifying solar heat gain independent of surface coloration may represent an important mechanism for adjustment of heat balance in nature.

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