Summit metabolism and metabolic expansibility in Wahlberg's epauletted fruit bats (Epomophorus wahlbergi) : seasonal acclimatisation and effects of captivity

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dc.contributor.author Minnaar, I.A. (Ingrid Ane)
dc.contributor.author Bennett, Nigel C., 1961-
dc.contributor.author Chimimba, Christian Timothy
dc.contributor.author McKechnie, Andrew E.
dc.date.accessioned 2015-07-27T08:15:48Z
dc.date.available 2015-07-27T08:15:48Z
dc.date.issued 2014-04
dc.description.abstract Summit metabolism (Msum), the maximum rate of resting metabolic thermogenesis, has been found to be broadly correlated with climatic variables and the use of heterothermy in some endotherms. Far less is known about Msum and metabolic expansibility [ME, the ratio of Msum to basal metabolic rate (BMR)] in bats compared with many other endotherm taxa. We measured BMR and Msum during winter and summer in captive and wild populations of a pteropodid from the southern subtropics, Wahlberg’s epauletted fruit bat (Epomophorus wahlbergi) in Pretoria, South Africa. The Msum of fruit bats ranged from 5.178±0.611 W (captive, summer) to 6.006±0.890 W (captive, winter), and did not vary significantly between seasons. In contrast, BMR decreased by 17–25% in winter. The combination of seasonally stable Msum but flexible BMR resulted in ME being significantly higher in winter than in summer, ranging from 7.24±1.49 (wild, summer) to 13.11±2.14 (captive, winter). The latter value is well above the typical mammalian range. Moreover, both Msum and ME were significantly higher in captive bats than in wild individuals; we speculate this represents a phenotypic response to a reduction in exerciseassociated heat production while in captivity. Our data for E. wahlbergi, combined with those currently available for other chiropterans, reveal that Msum in bats is highly variable compared with allometrically expected values for other mammals. en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship National Research Foundation [IFR2008042200022 to A.E.M. and GUN64756 to N.C.B.]. en_ZA
dc.description.uri http://jeb.biologists.org en_ZA
dc.identifier.citation Minnaar, IA, Bennett, NC, Chimimba, CT & McKechnie, AE 2014, 'Summit metabolism and metabolic expansibility in Wahlberg's epauletted fruit bats (Epomophorus wahlbergi) : seasonal acclimatisation and effects of captivity', Journal of Experimental Biology, vol. 217, no. 8, pp. 1363-1369. en_ZA
dc.identifier.issn 0022-0949 (print)
dc.identifier.issn 1477-9145 (online)
dc.identifier.other 10.1242/jeb.098400
dc.identifier.uri http://hdl.handle.net/2263/49156
dc.language.iso en en_ZA
dc.publisher Company of Biologists en_ZA
dc.rights © 2014. Published by The Company of Biologists Ltd. en_ZA
dc.subject Acclimatisation en_ZA
dc.subject Cold exposure en_ZA
dc.subject Helox en_ZA
dc.subject Phenotypic flexibility en_ZA
dc.subject Thermogenic capacity en_ZA
dc.title Summit metabolism and metabolic expansibility in Wahlberg's epauletted fruit bats (Epomophorus wahlbergi) : seasonal acclimatisation and effects of captivity en_ZA
dc.type Postprint Article en_ZA


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