干旱区生态环境知识资源中心(Arid): The joint effect of micro- and macro-climate on the thermoregulation and heat dissipation of two African mole-rat (Bathyergidae) sub-species, Cryptomys hottentotus mahali and C. h. pretoriae

Arid

DOI	10.1016/j.jtherbio.2021.103025
	The joint effect of micro- and macro-climate on the thermoregulation and heat dissipation of two African mole-rat (Bathyergidae) sub-species, Cryptomys hottentotus mahali and C. h. pretoriae
	Wallace, Kyra M. E.; van Jaarsveld, Barry; Bennett, Nigel C.; Hart, Daniel W.
通讯作者	Hart, DW (corresponding author), Univ Pretoria, Dept Zool & Entomol, Pretoria, South Africa.
来源期刊	JOURNAL OF THERMAL BIOLOGY
ISSN	0306-4565
EISSN	1879-0992
出版年	2021
卷号	99
英文摘要	The effect of the macro- and micmclimate on small mammal thermoregulation in the past has been studied independently instead of investigating the dual effect of both the components. This study addresses this dearth in knowledge by exploring the dual effect of both micro- and macro-climate on the thermoregulatory responses of two subterranean rodent species belonging to the family Bathyergidae, namely the more arid dwelling Mahali mole-rat (Cryptomys hottentotus mahali) and less arid dwelling Highveld mole-rat (C. h. pretoriae). Open flow through respirometry was used to quantify resting metabolic rates (RMR), evaporative water loss (EWL), core body temperature (Tb), the ratio between the evaporative heat loss and metabolic heat production (EHL/MHP: evaporative cooling capacity) and conductance (C-dry) over a range of increasing ambient temperatures (T-a; 20-42 degrees C). Furthermore, RMR, EWL, T-b, EHL/MHP and C-dry were measured at the mole-rat's thermal maxima (43 degrees C). At cooler temperatures, the arid-dwelling C. h. mahali possesses a broader thermoneutral zone (similar to 5 degrees C; 27.2-32.1 degrees C), while C. h. pretoriae possess a single thermoneutral point (33.6 degrees C). This is in response to the greater selection pressure to conserve energy in the more arid regions inhabited by C. h. mahali. Contrastingly, at hotter temperatures, there were no significant thermoregulatory differences in EWL, EHL/MHP or C-dry responses between the two sub-species, as expected due to the limitations bestowed by the buffered microclimates (burrow systems). Thus, neither macro-climate, nor micro-climate singularly moulds the thermoregulatory adaptations, but rather, it appears to be a combined effect from both climates. Other small endotherms may share this dual response, and therefore, it is crucial to incorporate the effect of both macro- and microclimates into future climate models when determining the ecological capabilities and persistence of a species.
英文关键词	Thermoregulation Macroclimate Microclimate Mole-rat Heat dissipation Thermoneutral zone
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000687787300003
WOS关键词	EVAPORATIVE WATER-LOSS ; BASAL METABOLIC-RATE ; AVIAN THERMOREGULATION ; SUBTERRANEAN RODENTS ; COOLING CAPACITY ; SMALL MAMMALS ; DESERT ; BURROWS ; TEMPERATURES ; ACCLIMATION
WOS类目	Biology ; Zoology
WOS研究方向	Life Sciences & Biomedicine - Other Topics ; Zoology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364053
作者单位	[Wallace, Kyra M. E.; van Jaarsveld, Barry; Bennett, Nigel C.; Hart, Daniel W.] Univ Pretoria, Dept Zool & Entomol, Private Bag X20, ZA-0028 Hatfield, South Africa
推荐引用方式 GB/T 7714	Wallace, Kyra M. E.,van Jaarsveld, Barry,Bennett, Nigel C.,et al. The joint effect of micro- and macro-climate on the thermoregulation and heat dissipation of two African mole-rat (Bathyergidae) sub-species, Cryptomys hottentotus mahali and C. h. pretoriae[J],2021,99.
APA	Wallace, Kyra M. E.,van Jaarsveld, Barry,Bennett, Nigel C.,&Hart, Daniel W..(2021).The joint effect of micro- and macro-climate on the thermoregulation and heat dissipation of two African mole-rat (Bathyergidae) sub-species, Cryptomys hottentotus mahali and C. h. pretoriae.JOURNAL OF THERMAL BIOLOGY,99.
MLA	Wallace, Kyra M. E.,et al."The joint effect of micro- and macro-climate on the thermoregulation and heat dissipation of two African mole-rat (Bathyergidae) sub-species, Cryptomys hottentotus mahali and C. h. pretoriae".JOURNAL OF THERMAL BIOLOGY 99(2021).