干旱区生态环境知识资源中心(Arid): Thermal physiology of a range-restricted desert lark

Arid

DOI	10.1007/s00360-018-1190-1
	Thermal physiology of a range-restricted desert lark
	Kemp, Ryno 1,2; McKechnie, Andrew E.1,2
通讯作者	McKechnie, Andrew E.
来源期刊	JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMS AND ENVIRONMENTAL PHYSIOLOGY
ISSN	0174-1578
EISSN	1432-136X
出版年	2019
卷号	189 期号:1 页码:131-141
英文摘要	Much recent work on avian physiological adaptation to desert environments has focused on larks (Passeriformes: Alaudidae). We tested the prediction that the threatened red lark (Calendulauda burra), a species restricted to very arid parts of South Africa and which is not known to drink, exhibits highly efficient evaporative cooling and makes pronounced use of facultative hyperthermia when exposed to high air temperatures (T-a). We also predicted that C. burra possesses similarly low basal metabolic rate (BMR) and total evaporative water loss (EWL) at moderate T-a as reported for species from the deserts of the Middle East. Rest-phase thermoregulation in C. burra was characterized by an unusually low lower critical limit of thermoneutrality at T-a=21 degrees C and a BMR of 0.317 +/- 0.047W, the lowest BMR relative to allometrically-expected values yet reported in any lark. During the diurnal active phase, red larks were able to tolerate T-a up to 50 degrees C, with the onset of panting occurring at T-a = 38 degrees C. Maximum EWL was 1.475 +/- 0.107g h(-1) at T-a = 50 degrees C, equivalent to 620% of minimum EWL at thermoneutrality. The maximum ratio of evaporative heat dissipation to metabolic heat production was 1.58, a value towards the lower end of the range reported for passerines. Our data support the prediction that C. burra shows metabolic traits similar to those of other larks inhabiting extremely arid climates, but not the notion that evaporative cooling at high T-a in this species is more efficient than in most passerines.
英文关键词	Alaudidae Basal metabolic rate Body temperature Calendulauda burra Evaporative water loss Heat tolerance
类型	Article
语种	英语
国家	South Africa
收录类别	SCI-E
WOS记录号	WOS:000455828300011
WOS关键词	EVAPORATIVE WATER-LOSS ; HEAT RESTING METABOLISM ; AVIAN THERMOREGULATION ; COOLING CAPACITY ; INTERSPECIFIC VARIATION ; TOLERANCE ; BASAL ; BIRDS ; TEMPERATURE ; PERSPECTIVE
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/2XILL650/216896
作者单位	1.Univ Pretoria, Dept Zool & Entomol, Fitzpatrick Inst, DST NRF Ctr Excellence, Private Bag X20, ZA-0028 Pretoria, South Africa; 2.South African Natl Biodivers Inst, Natl Zool Garden, South African Res Chair Conservat Physiol, POB 754, ZA-0001 Pretoria, South Africa
推荐引用方式 GB/T 7714	Kemp, Ryno,McKechnie, Andrew E.. Thermal physiology of a range-restricted desert lark[J],2019,189(1):131-141.
APA	Kemp, Ryno,&McKechnie, Andrew E..(2019).Thermal physiology of a range-restricted desert lark.JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMS AND ENVIRONMENTAL PHYSIOLOGY,189(1),131-141.
MLA	Kemp, Ryno,et al."Thermal physiology of a range-restricted desert lark".JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMS AND ENVIRONMENTAL PHYSIOLOGY 189.1(2019):131-141.