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Thermal adaptiveness of plumage color in screech owls

Auk

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Abstract

We measured oxygen consumption rates of 8 Screech? Owls (4 red and 4 gray phase) at 4 environmental temperatures, -10?, -5?, 5?, and 15?C. These data demonstrated a significant difference in oxygen uptake between color phases at -10? and -5?C. This supports our hypothesis that red phase Screech Owls are restricted in their northern distribution by color-related metabolic differences from the gray phase birds. The problems of low red phase occurrence in the Gulf Coast states and their absence from the Western states remain to be studied.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Thermal adaptiveness of plumage color in screech owls
Series title:
Auk
Volume
93
Issue:
3
Year Published:
1976
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
614-619
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Auk
First page:
614
Last page:
619
Number of Pages:
6