Abstract
It has been hypothesized that organisms living at different latitudes or in different environments adjust their metabolic activity to the prevailing conditions. However, do differences in energy turnover simply represent a phenotypic adaptation to the local environment, or are they genetically based? To test this, we obtained nestling stonechats (Saxicola torquata) from equatorial Kenya (0 degrees N), Ireland (51.5 degrees N), Austria (47.5 degrees N) and Kazakhstan (51.5 degrees N). Birds were hand-raised and kept in Andechs, Germany. We measured their resting metabolic rates (RMR) and locomotor activity at an age of ca. 14 months (July) and 20 months (January), when birds went through postnuptial moult (July), and neither moulted nor exhibited enlarged gonads or migratory activity (January). RMR was generally higher during moult, but differed among populations: RMR was lowest in the resident Kenyan birds, higher in mostly sedentary Irish birds, and highest in migratory Austrian and Kazakhstan birds. Thus our data demonstrate that even in birds kept from early life under common-garden conditions, the 'pace of life', as indicated by metabolic turnover, is lower in sedentary tropical than in north-temperate migratory individuals of the same species. Such intrinsically low energy expenditure in sedentary tropical birds may have important implications for slow development, delayed senescence and high longevity in many tropical organisms.
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Selected References
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- Buttemer W. A., Astheimer L. B., Wingfield J. C. The effect of corticosterone on standard metabolic rates of small passerine birds. J Comp Physiol B. 1991;161(4):427–431. doi: 10.1007/BF00260804. [DOI] [PubMed] [Google Scholar]
- Dawson W. R., Marsh R. L., Yacoe M. E. Metabolic adjustments of small passerine birds for migration and cold. Am J Physiol. 1983 Dec;245(6):R755–R767. doi: 10.1152/ajpregu.1983.245.6.R755. [DOI] [PubMed] [Google Scholar]
- Ghalambor C. K., Martin T. E. Fecundity-survival trade-offs and parental risk-taking in birds. Science. 2001 Apr 20;292(5516):494–497. doi: 10.1126/science.1059379. [DOI] [PubMed] [Google Scholar]
- Gillooly J. F., Brown J. H., West G. B., Savage V. M., Charnov E. L. Effects of size and temperature on metabolic rate. Science. 2001 Sep 21;293(5538):2248–2251. doi: 10.1126/science.1061967. [DOI] [PubMed] [Google Scholar]
- Hamilton W. D. The moulding of senescence by natural selection. J Theor Biol. 1966 Sep;12(1):12–45. doi: 10.1016/0022-5193(66)90184-6. [DOI] [PubMed] [Google Scholar]
- Hudson J. W., Kimzey S. L. Temperature regulation and metabolic rhythms in populations of the house sparrow, Passer domesticus. Comp Biochem Physiol. 1966 Jan;17(1):203–217. doi: 10.1016/0010-406x(66)90021-1. [DOI] [PubMed] [Google Scholar]
- Kirkwood T. B. Evolution of ageing. Nature. 1977 Nov 24;270(5635):301–304. doi: 10.1038/270301a0. [DOI] [PubMed] [Google Scholar]
- Leroi A. M., Bennett A. F., Lenski R. E. Temperature acclimation and competitive fitness: an experimental test of the beneficial acclimation assumption. Proc Natl Acad Sci U S A. 1994 Mar 1;91(5):1917–1921. doi: 10.1073/pnas.91.5.1917. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Martin Lynn B., 2nd, Scheuerlein Alex, Wikelski Martin. Immune activity elevates energy expenditure of house sparrows: a link between direct and indirect costs? Proc Biol Sci. 2003 Jan 22;270(1511):153–158. doi: 10.1098/rspb.2002.2185. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Pohl H. Circadian rhythms of metabolism in cardueline finches as function of light intensity and season. Comp Biochem Physiol A Comp Physiol. 1977;56(2):145–153. doi: 10.1016/0300-9629(77)90176-1. [DOI] [PubMed] [Google Scholar]
- Scheuerlein A., Van't Hof T. J., Gwinner E. Predators as stressors? Physiological and reproductive consequences of predation risk in tropical stonechats (Saxicola torquata axillaris). Proc Biol Sci. 2001 Aug 7;268(1476):1575–1582. doi: 10.1098/rspb.2001.1691. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wikelski Martin, Tarlow Elisa M., Raim Arlo, Diehl Robert H., Larkin Ronald P., Visser G. Henk. Avian metabolism: Costs of migration in free-flying songbirds. Nature. 2003 Jun 12;423(6941):704–704. doi: 10.1038/423704a. [DOI] [PubMed] [Google Scholar]
- Withers P. C. Measurement of VO2, VCO2, and evaporative water loss with a flow-through mask. J Appl Physiol Respir Environ Exerc Physiol. 1977 Jan;42(1):120–123. doi: 10.1152/jappl.1977.42.1.120. [DOI] [PubMed] [Google Scholar]