Intraspecific allometry of basal metabolic rate: relations with body size, temperature, composition, and circadian phase in the kestrel, Falco tinnunculus
| Autor: | Arjen M. Strijkstra, Dirkjan Masman, Serge Daan, Simon Verhulst |
|---|---|
| Přispěvatelé: | Beersma lab, Verhulst lab |
| Rok vydání: | 1989 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty Physiology Zoology Kestrel Nocturnal Intraspecific competition Body Temperature Birds 03 medical and health sciences 0302 clinical medicine Physiology (medical) Internal medicine medicine Homeothermy Animals Circadian rhythm biology biology.organism_classification Circadian Rhythm 030104 developmental biology Endocrinology Basal metabolic rate Lean body mass Body Composition Body Constitution Allometry Basal Metabolism 030217 neurology & neurosurgery |
| Zdroj: | Journal of Biological Rhythms, 4(2), 267-283. SAGE Publications Inc. |
| ISSN: | 0748-7304 |
| Popis: | The relationship between body size and basal metabolic rate (BMR) in homeo therms has been treated in the literature primarily by comparison between species of mammals or birds. This paper focuses on the intraindividual changes in BMR when body mass (W) varies with different maintenance regimens. BMR varied in individual kestrels in proportion to W1.67, which is considerably steeper than the mass exponents for homomorphic change (0.667; Heusner, 1984) for interspecific comparison among all birds (0.677) or raptors (0.678), for interindividual comparison of kestrels on ad libitum maintenance regimens (0.786), and for mass proportionality (1.00). The circadian range of telemetered core temperature also varied more strongly with intraindividual than with interspecific (Aschoff, 1981a) variation in mass. This was due to reduced nocturnal core temperature at low-maintenance regimens, which was, however, insufficient to account for the excessive reduction in BMR. Carcass analysis of eight birds sacrificed revealed a disproportionate reduction in heart and kidney lean mass at low-maintenance regimens. We surmise that variation in BMR primarily reflects variation in these metabolically highly active tissues. This may account for positive correlations found between heart, kidney, and BMR residuals relative to interspecific allometric prediction, and between α and p residuals, as expected on the basis of the constant excess of BMR during α above BMR during p (Aschoff & Pohl, 1970a). |
| Databáze: | OpenAIRE |
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