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Comparative physiology of the Scrub Jay (Aphelocoma coerulescens) and the Steller\"s Jay (Cyanocitta Stelleri)

Author:
Mann   Nancy Jean  


Journal:
Comparative Biochemistry and Physiology A


Issue Date:
1983


Abstract(summary):

Minimum daily water requirements, standard metabolic rate, total and respiratory evaporative water loss, and the role of the unfeathered tarsi in the regulation of body temperature in the scrub jay (A. coerulescens obscura) and the Steller's jay (C. stelleri frontalis) were compared. When provided with Tenebrio larvae, scrub jays were able to maintain a constant body weight in the absence of drinking water the Steller's jay required 1.1% of body weight/day. Scrub jays had a much wider thermoneutral zone (12.4.degree.-24.0.degree. C) than did Steller's jays (28.0.degree.-31.8.degree. C). There was no significant difference in the standard metabolic rate within the thermoneutral zone or in evaporative water loss rates of the 2 species. The unfeathered tarsi appear to be important sites of non-evaporative heat loss during activity in both species. Ability to utilize the tarsi as heat dissipators at high ambient temperatures appears best developed in the scrub jay. Allopatry between the 2 species may be maintained by combination of behavioral and physiological differences.


Page:
305-318


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