干旱区生态环境知识资源中心(Arid): Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Years in Two Arid-Zone Passerines

Arid

DOI	10.1086/707679
	Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Years in Two Arid-Zone Passerines
	Noakes, Matthew J.1; McKechnie, Andrew E.1,2
通讯作者	McKechnie, Andrew E.
来源期刊	PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY
ISSN	1522-2152
EISSN	1537-5293
出版年	2020
卷号	93 期号:2 页码:140-152
英文摘要	Adaptive plasticity in avian thermal physiology is increasingly apparent, with a well-studied example being metabolic upregulation during cold winters in small birds inhabiting temperate and boreal latitudes. Recent studies have revealed greater variation in the direction and magnitude of seasonal metabolic adjustments among subtropical/tropical birds experiencing milder winters compared with higher-latitude counterparts, suggesting that patterns could vary among years within populations. We quantified seasonal metabolic variation (summer vs. winter) in Kalahari Desert populations of two Afrotropical passerines, the white-browed sparrow-weaver (WBSW; Plocepasser mahali; similar to 40 g) and the scaly-feathered weaver (SFW; Sporopipes squamifrons; similar to 10 g) over subsequent years (2014-2017). We used flow-through respirometry to measure basal metabolic rate (BMR) and summit metabolism (M-sum; maximum cold-induced resting metabolic rate) and quantified seasonal fluctuations in air temperature (T-a) and food abundance (arthropod and grass seed abundance) at the study site. Our data reveal that the direction and magnitude of seasonal metabolic acclimatization vary among years in both species, with the winter BMR of WBSWs ranging from similar to 20% lower to 68% higher compared with the summer BMR. In contrast to higher-latitude species, M-sum was not related to the cold-limit temperature of birds or to winter minimum T-a at the study site, but interannual variation in BMR and M-sum was significantly lower in seasons with lower food abundance in both WBSWs and SFWs. Our data support the idea that patterns of seasonal acclimatization are more variable in birds from lower latitudes and that there is considerable phenotypic flexibility in avian thermal physiology.
英文关键词	acclimatization phenotypic flexibility adaptive plasticity hypothermia summit metabolism basal metabolic rate subtropical birds
类型	Article
语种	英语
国家	South Africa
收录类别	SCI-E
WOS记录号	WOS:000512046000002
WOS关键词	EVAPORATIVE COOLING CAPACITY ; BENEFICIAL ACCLIMATION ; PHENOTYPIC FLEXIBILITY ; SUMMIT METABOLISM ; THERMOREGULATORY RESPONSES ; HEAT TOLERANCE ; TROPICAL BIRDS ; BASAL ; WINTER ; TEMPERATURE
WOS类目	Physiology ; Zoology
WOS研究方向	Physiology ; Zoology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315314
作者单位	1.Univ Pretoria, Dept Zool & Entomol, Fitzpatrick Inst, DST NRF Ctr Excellence, Pretoria, South Africa; 2.South African Natl Biodivers Inst, South African Res Chair Conservat Physiol, Pretoria, South Africa
推荐引用方式 GB/T 7714	Noakes, Matthew J.,McKechnie, Andrew E.. Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Years in Two Arid-Zone Passerines[J],2020,93(2):140-152.
APA	Noakes, Matthew J.,&McKechnie, Andrew E..(2020).Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Years in Two Arid-Zone Passerines.PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY,93(2),140-152.
MLA	Noakes, Matthew J.,et al."Seasonal Metabolic Acclimatization Varies in Direction and Magnitude among Years in Two Arid-Zone Passerines".PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY 93.2(2020):140-152.