干旱区生态环境知识资源中心(Arid): Sublethal fitness costs of chronic exposure to hot weather vary between sexes in a threatened desert lark

Arid

DOI	10.1080/01584197.2020.1806082
	Sublethal fitness costs of chronic exposure to hot weather vary between sexes in a threatened desert lark
	Kemp, Ryno; Freeman, Marc T.; van Jaarsveld, Barry; Czenze, Zenon J.; Conradie, Shannon R.; McKechnie, Andrew E.
通讯作者	McKechnie, AE
来源期刊	EMU-AUSTRAL ORNITHOLOGY
ISSN	0158-4197
EISSN	1448-5540
出版年	2020
卷号	120 期号:3 页码:216-229
英文摘要	Behavioural trade-offs between foraging and thermoregulation result in negative relationships between diurnal body mass (M-b) gain and daily maximum air temperature (T-max) in arid-zone birds. However, it remains unclear how these trade-offs are affected by habitat type or sexually dimorphic behaviour. Using the South African arid-zone endemic Red Lark (Calendulauda burra) as a model taxon and focusing solely on non-breeding adults, we evaluated predictions that a) time-activity budgets are more strongly affected by air temperature (T-a) than is the case for species occurring in arid savanna habitats with greater access to shaded microsites, and b) the effects of T-max on diurnal M-b gain differ between males and females. Behavioural observations revealed an effect of T-a on activity, and sex differences in the temperature-dependence of resting and wing-spreading. Moreover, M-b data obtained from habituated larks trained to perch on an electronic balance revealed that in males, but not females, diurnal M-b gain was negatively related to T-max, with diurnal M-b gain equivalent to average overnight M-b loss when T-max = 33.5 degrees C and zero diurnal M-b gain (i.e. net 24-hr M-b loss of similar to 5 %) when T-max = 40.0 degrees C. Under recent climate conditions, male Red Larks rarely, if ever, experienced consecutive days with T-max > 40.0 degrees C but, under an unmitigated climate change scenario, will experience 10-15 consecutive days per summer by the end of the 21(st)century. Our findings suggest that this threatened lark species is unlikely to persist across much of its current range by 2100.
英文关键词	Alaudidae Calendulauda burra daily maximum temperature climate change sex-specific temperature-dependent behaviour
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000568328400001
WOS关键词	BODY CONDITION ; FORAGING BEHAVIOR ; HIGH-TEMPERATURES ; THERMOREGULATION ; SUMMER ; BIRD
WOS类目	Ornithology
WOS研究方向	Zoology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326193
作者单位	[Kemp, Ryno; Freeman, Marc T.; van Jaarsveld, Barry; Czenze, Zenon J.; Conradie, Shannon R.; McKechnie, Andrew E.] South African Natl Biodivers Inst, South African Res Chair Conservat Physiol, Pretoria, South Africa; [Kemp, Ryno; Freeman, Marc T.; van Jaarsveld, Barry; Czenze, Zenon J.; Conradie, Shannon R.; McKechnie, Andrew E.] Univ Pretoria, Dept Zool & Entomol, Fitzpatrick Inst, DSI NRF Ctr Excellence, Pretoria, South Africa
推荐引用方式 GB/T 7714	Kemp, Ryno,Freeman, Marc T.,van Jaarsveld, Barry,et al. Sublethal fitness costs of chronic exposure to hot weather vary between sexes in a threatened desert lark[J],2020,120(3):216-229.
APA	Kemp, Ryno,Freeman, Marc T.,van Jaarsveld, Barry,Czenze, Zenon J.,Conradie, Shannon R.,&McKechnie, Andrew E..(2020).Sublethal fitness costs of chronic exposure to hot weather vary between sexes in a threatened desert lark.EMU-AUSTRAL ORNITHOLOGY,120(3),216-229.
MLA	Kemp, Ryno,et al."Sublethal fitness costs of chronic exposure to hot weather vary between sexes in a threatened desert lark".EMU-AUSTRAL ORNITHOLOGY 120.3(2020):216-229.