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Effects of dietary quality on basal metabolic rate and internal morphology of European starlings (Sturnus vulgaris)

Physiological and Biochemical Zoology

By:
and
DOI: 10.1086/316654

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Abstract

European starlings (Sturnus vulgaris) were fed either a low- or high-quality diet to test the effects of dietary quality on basal metabolic rate (BMR) and internal morphology. Basal metabolic rate did not differ significantly between the two dietary groups, but internal morphology differed greatly. Starlings fed the low-quality diet had heavier gastrointestinal tracts, gizzards, and livers. Starlings fed the high-quality diet had heavier breast muscles. Starlings on the low-quality diet maintained mass, while starlings on the high-quality diet gained mass. Dry matter digestibility and energy digestibility were lower for starlings fed the low-quality diet, and their food and water intake were greater than starlings on the high-quality diet. The lack of dietary effect on BMR may be the result of increased energy expenditure of digestive organs paralleling a reduction of energy expenditure of organs and tissues not related to digestion (i.e., skeletal muscle). This trade-off in energy allocation among organs suggests a mechanism by which organisms may alter BMR in response to a change in seasonal variation in food availability.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of dietary quality on basal metabolic rate and internal morphology of European starlings (Sturnus vulgaris)
Series title:
Physiological and Biochemical Zoology
DOI:
10.1086/316654
Volume
72
Issue:
2
Year Published:
1999
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Physiological and Biochemical Zoology
First page:
189
Last page:
197
Number of Pages:
9