干旱区生态环境知识资源中心(Arid): The heat is on: Thermoregulatory and evaporative cooling patterns of desert-dwelling bats

Arid

DOI	10.1016/j.jtherbio.2024.103919
	The heat is on: Thermoregulatory and evaporative cooling patterns of desert-dwelling bats
	de Mel, Ruvinda K.; Moseby, Katherine E.; Stewart, Kathleen A.; Rankin, Kate E.; Czenze, Zenon J.
通讯作者	de Mel, RK
来源期刊	JOURNAL OF THERMAL BIOLOGY
ISSN	0306-4565
EISSN	1879-0992
出版年	2024
卷号	123
英文摘要	For small endotherms inhabiting desert ecosystems, defending body temperatures (T-b) is challenging as they contend with extremely high ambient temperatures (T-a) and limited standing water. In the arid zone, bats may thermoconform whereby T-b varies with T-a, or may evaporatively cool themselves to maintain T-b < T-a. We used an integrative approach that combined both temperature telemetry and flow through respirometry to investigate the ecological and physiological strategies of lesser long-eared bats (Nyctophilus geoffroyi) in Australia's arid zone. We predicted individuals would exhibit desert-adapted thermoregulatory patterns (i.e., thermoconform to prioritise water conservation), and that females would be more conservative with their water reserves for evaporative cooling compared to males. Temperature telemetry data indicated that free-ranging N. geoffroyi were heterothermic (T-skin = 18.9-44.9 degrees C) during summer and thermoconformed over a wide range of temperatures, likely to conserve water and energy during the day. Experimentally, at high T(a)s, females maintained significantly lower T-b and resting metabolic rates, despite lower evaporative water loss (EWL) rates compared to males. Females only increased EWL at experimental T-a = 42.5 degrees C, significantly higher than males (40.7 degrees C), and higher than any bat species yet recorded. During the hottest day of this study, our estimates suggest the water required for evaporative cooling ranged from 18.3% (females) and 25.5% (males) of body mass. However, if we extrapolate these results to a recent heatwave these values increase to 36.5% and 47.3%, which are likely beyond lethal limits. It appears this population is under selective pressures to conserve water reserves and that these pressures are more pronounced in females than males. Bats in arid ecosystems are threatened by both current and future heatwaves and we recommend future conservation efforts focus on protecting current roost trees and creating artificial standing water sites near vulnerable populations.
英文关键词	Heat tolerance limit Evaporative water loss Water balance Arid zone Bats Thermoregulation
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001274532200001
WOS关键词	LONG-EARED BATS ; FREE-TAILED BAT ; NYCTOPHILUS-GEOFFROYI CHIROPTERA ; WATER-LOSS ; CLIMATE-CHANGE ; INTERSPECIFIC VARIATION ; HIBERNATING BATS ; TORPOR ; TOLERANCE ; TEMPERATURE
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/2XILL650/404744
推荐引用方式 GB/T 7714	de Mel, Ruvinda K.,Moseby, Katherine E.,Stewart, Kathleen A.,et al. The heat is on: Thermoregulatory and evaporative cooling patterns of desert-dwelling bats[J],2024,123.
APA	de Mel, Ruvinda K.,Moseby, Katherine E.,Stewart, Kathleen A.,Rankin, Kate E.,&Czenze, Zenon J..(2024).The heat is on: Thermoregulatory and evaporative cooling patterns of desert-dwelling bats.JOURNAL OF THERMAL BIOLOGY,123.
MLA	de Mel, Ruvinda K.,et al."The heat is on: Thermoregulatory and evaporative cooling patterns of desert-dwelling bats".JOURNAL OF THERMAL BIOLOGY 123(2024).