干旱区生态环境知识资源中心(Arid): The costs of keeping cool: behavioural trade-offs between foraging and thermoregulation are associated with significant mass losses in an arid-zone bird

Arid

DOI	10.1007/s00442-019-04486-x
	The costs of keeping cool: behavioural trade-offs between foraging and thermoregulation are associated with significant mass losses in an arid-zone bird
	van de Ven, T. M. F. N.1; McKechnie, A. E.2,3; Cunningham, S. J.1
通讯作者	Cunningham, S. J.
来源期刊	OECOLOGIA
ISSN	0029-8549
EISSN	1432-1939
出版年	2019
卷号	191 期号:1 页码:205-215
英文摘要	Avian responses to high environmental temperatures include retreating to cooler microsites and/or increasing rates of evaporative heat dissipation via panting, both of which may affect foraging success. We hypothesized that behavioural trade-offs constrain the maintenance of avian body condition in hot environments, and tested predictions arising from this hypothesis for male Southern Yellow-billed Hornbills (Tockus leucomelas) breeding in the Kalahari Desert. Operative temperatures experienced by the hornbills varied by up to 13 degrees C among four microsite categories used by foraging males. Lower prey capture rates while panting and reductions associated with the occupancy of off-ground microsites, resulted in sharp declines in foraging efficiency during hot weather. Consequently, male body mass (M-b) gain between sunrise and sunset decreased with increasing daily maximum air temperature (T-max), from similar to 5% when T-max < 25 degrees C to zero when T-max = 38.4 degrees C. Overnight M-b loss averaged similar to 4.5% irrespective of T-max, creating a situation where nett 24-h M-b loss approached 5% on extremely hot days. These findings support the notion that temperature is a major determinant of body condition for arid-zone birds. Moreover, the strong temperature dependence of foraging success and body condition among male hornbills provisioning nests raises the possibility that male behavioural trade-offs translate into equally strong effects of hot weather on female condition and nest success. Our results also reveal how rapid anthropogenic climate change is likely to substantially decrease the probability of arid-zone birds like hornbills being able to successfully provision nests while maintaining their own condition.
英文关键词	Tockus leucomelas Southern yellow-billed hornbill Climate change Microsite Body condition
类型	Article
语种	英语
国家	South Africa
收录类别	SCI-E
WOS记录号	WOS:000484956600017
WOS关键词	CLIMATE-CHANGE ; HIGH-TEMPERATURES ; BODY CONDITION ; WARMING WORLD ; HEAT-TRANSFER ; HABITAT USE ; MORTALITY ; PREDATION ; SELECTION ; ANIMALS
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217810
作者单位	1.Univ Cape Town, FitzPatrick Inst African Ornithol, DST NRF Ctr Excellence, Private Bag X3, ZA-7701 Rondebosch, South Africa; 2.Univ Pretoria, Fitzpatrick Inst, Dept Zool & Entomol, DST NRF Ctr Excellence, ZA-0002 Pretoria, South Africa; 3.South African Natl Biodivers Inst, South African Res Chair Conservat Physiol, Natl Zool Garden, Pretoria, South Africa
推荐引用方式 GB/T 7714	van de Ven, T. M. F. N.,McKechnie, A. E.,Cunningham, S. J.. The costs of keeping cool: behavioural trade-offs between foraging and thermoregulation are associated with significant mass losses in an arid-zone bird[J],2019,191(1):205-215.
APA	van de Ven, T. M. F. N.,McKechnie, A. E.,&Cunningham, S. J..(2019).The costs of keeping cool: behavioural trade-offs between foraging and thermoregulation are associated with significant mass losses in an arid-zone bird.OECOLOGIA,191(1),205-215.
MLA	van de Ven, T. M. F. N.,et al."The costs of keeping cool: behavioural trade-offs between foraging and thermoregulation are associated with significant mass losses in an arid-zone bird".OECOLOGIA 191.1(2019):205-215.