干旱区生态环境知识资源中心(Arid): Too hot to handle? Behavioural plasticity during incubation in a small, Australian passerine

Arid

DOI	10.1016/j.jtherbio.2021.102921
	Too hot to handle? Behavioural plasticity during incubation in a small, Australian passerine
	Sharpe, Lynda L.; Bayter, Camilo; Gardner, Janet L.
通讯作者	Sharpe, LL (corresponding author), 45 Pelican St, Loch Sport, Vic 3851, Australia.
来源期刊	JOURNAL OF THERMAL BIOLOGY
ISSN	0306-4565
EISSN	1879-0992
出版年	2021
卷号	98
英文摘要	Global warming and intensifying extreme heat events may affect avian reproductive success and costs, particularly in hot, arid environments. It is unclear how breeding birds alter their behaviour in response to rapid climate change, and whether such plasticity will be sufficient to offset rising temperatures. We examine whether a small, open-cup nesting, passerine - the Jacky Winter Microeca fascinans - in semi-arid Australia, exhibits similar levels of behavioural plasticity when incubating under high temperatures as low, and how heat impacts upon parental effort, body mass change and reproductive success. At high temperatures, female effort increased. Females doubled nest attendance between 28 degrees C and 40 degrees C, switching from incubating to shading eggs at approx. 30 degrees C. Egg-shading females panted to avoid hyperthermia. Panting increased with temperature and sun exposure. Male breeding effort was linked to temperature extremes. In cold conditions, males provisioned their mates heavily, buffering females from additional energetic costs, and males suffered a loss of body mass. In extreme heat, males helped shade eggs (although they never incubated). The likelihood of male egg-shading increased with temperature, but level of contribution was positively related to sun exposure. Hatching success declined with air temperatures >35 degrees C. Egg mortality reached 100 at air temperatures >42.5 degrees C. Parents continued to attend unviable eggs (for up to two weeks), suggesting egg-loss from heat exposure is a recent phenomenon. Although pairs exhibited considerable behavioural plasticity - including positioning nests to maximize afternoon shade - this was insufficient to counter extreme temperatures. In 2019, one hot day (45 degrees C) effectively terminated reproduction two months early, and was associated with a 50% decrease in reproductive success. The increasing frequency, intensity and earlier arrival of extreme heat events is likely to pose a major threat to avifauna populations in hot, arid environments, due to increased parental costs, reduced reproductive success and direct mortality.
英文关键词	Behavioural plasticity Climate change Extreme heat events Heat dissipation Incubation Thermoregulation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000663096700004
WOS关键词	NEST-SITE SELECTION ; HEAT-STRESS ; AMBIENT-TEMPERATURE ; PARENTAL BEHAVIOR ; DESERT ; IMPACT ; EGG ; ENVIRONMENT ; ATTENDANCE ; EVOLUTION
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/2XILL650/351029
作者单位	[Sharpe, Lynda L.; Bayter, Camilo; Gardner, Janet L.] Australian Natl Univ, Res Sch Biol, Div Ecol & Evolut, RN Robertson Bldg,46 Sullivans Creek Rd, Canberra, ACT 2601, Australia
推荐引用方式 GB/T 7714	Sharpe, Lynda L.,Bayter, Camilo,Gardner, Janet L.. Too hot to handle? Behavioural plasticity during incubation in a small, Australian passerine[J],2021,98.
APA	Sharpe, Lynda L.,Bayter, Camilo,&Gardner, Janet L..(2021).Too hot to handle? Behavioural plasticity during incubation in a small, Australian passerine.JOURNAL OF THERMAL BIOLOGY,98.
MLA	Sharpe, Lynda L.,et al."Too hot to handle? Behavioural plasticity during incubation in a small, Australian passerine".JOURNAL OF THERMAL BIOLOGY 98(2021).