Seasonal metabolic variation in two populations of an Afrotropical euplectid bird

Show simple item record Van de Ven, Tanja M.F.N. Mzilikazi, Nomakwezi McKechnie, Andrew E. 2013-02-08T07:35:55Z 2013-10-26T00:20:04Z 2012-10-23
dc.description.abstract Many birds exhibit seasonal phenotypic flexibility in basal metabolic rate (BMR) and summit metabolism (Msum), but very little information is available for species from subtropical latitudes or for conspecific populations from sites that vary in climate. We measured body mass (Mb), BMR, and Msum in summer and winter in two populations of the southern red bishop Euplectes orix, a passerine that is widespread in southern Africa. One population occurs at a comparatively warmer coastal site (mean daily minimum air temperature [Ta] inmidwinter, 8.3 C) and the other at a colder inland site (mean daily minimum Ta in midwinter, 2.8 C). Bishops from both populations significantly increased Mb in winter. However, seasonal metabolic adjustments differed considerably between the populations. The inland population significantly increased BMR by approximately 58%, mass-specific BMR by approximately 31%, and Msum by approximately 15% in winter, although massspecific Msum did not change significantly. In contrast, the coastal population showed no significant seasonal change in BMR and significant winter reductions in mass-specific BMR (∼15%), Msum (∼8%), and mass-specific Msum (∼15%). The interpopulation differences in the magnitude and direction of seasonal mass-specific BMR changes are qualitatively consistent with global patterns, although the increase shown by the inland population is larger than expected. Our data reveal that avian seasonal metabolic adjustments can vary greatly within subtropical species depending on the climatic conditions experienced by the birds, and our findings reiterate the need to better understand metabolic flexibility in species that inhabit lower latitudes. en
dc.description.librarian am2013 en
dc.description.librarian ab2013
dc.description.sponsorship The National Research Foundation (NRF) to N.M. and A.E.M. en
dc.description.uri en
dc.identifier.citation Van de Ven, TMFN, Mzilikazi, N & McKennie, AE 2012, 'Seasonal metabolic variation in two populations of an Afrotropical Euplectid bird', Physiological and Biochemical Zoology, vol. 86, no. 1, pp. 19-26. en
dc.identifier.issn 1522-2152 (print)
dc.identifier.issn 1537-5293 (online)
dc.identifier.other 10.1086/667989
dc.language.iso en en
dc.publisher University of Chicago Press en
dc.rights © 2012 by The University of Chicago en
dc.subject Afrotropical euplectid bird en
dc.subject Metabolic flexibility en
dc.subject BMR en
dc.subject Msum en
dc.subject Southern red bishop en
dc.subject.lcsh Birds en
dc.subject.lcsh Basal metabolism en
dc.subject.lcsh Metabolism en
dc.title Seasonal metabolic variation in two populations of an Afrotropical euplectid bird en
dc.type Article en

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