干旱区生态环境知识资源中心(Arid): Landscape-dependent time versus energy optimizations in pelicans migrating through a large ecological barrier

Arid

DOI	10.1111/1365-2435.13426
	Landscape-dependent time versus energy optimizations in pelicans migrating through a large ecological barrier
	Efrat, Ron 1,3; Hatzofe, Ohad 2; Nathan, Ran 1
通讯作者	Efrat, Ron
来源期刊	FUNCTIONAL ECOLOGY
ISSN	0269-8463
EISSN	1365-2435
出版年	2019
卷号	33 期号:11 页码:2161-2171
英文摘要	During migration, birds are often forced to cross ecological barriers, facing challenges due to scarcity of resources and suitable habitats. While crossing such barriers, birds are expected to adjust their behaviour to reduce time, energy expenditure and associated risks. We studied the crossing of the Sahara Desert by the Great White Pelican (Pelecanus onocrotalus), a large wetland-specialist. We focused on decisions made by migrating pelicans along different parts of the southbound autumn migration, their response to local environmental conditions and the implications for time and energy optimizations. We compared the observed pelicans' migration routes with simulated 'direct-pass' (shortest, mostly across the desert) and 'corridor-pass' (along the Nile River) routes, and used GPS, body acceleration and atmospheric modelling to compare flight behaviour along the Nile River versus the desert. The observed route was significantly shorter and faster than the simulated corridor-pass route and not significantly different from the simulated direct-pass one. Daily flights over the desert were longer than along the Nile River, with flying time extending to late hours of the day despite unfavourable atmospheric conditions for soaring-gliding flight. Moreover, the pelicans' behavioural response to atmospheric conditions changed according to the landscape over which they flew. Overall, the pelicans showed stronger behavioural adjustments to atmospheric conditions over the desert than along the Nile River. Our findings suggest that migrating pelicans primarily acted as time minimizers while crossing the Sahara Desert, whereas energetic optimization was only considered when it did not substantially compromise time optimization. The pelicans took the almost shortest possible route, only following the Nile River along its south-oriented parts, and frequently staged overnight in the desert far from water, despite being large, wet-habitat specialists. Correspondingly, their behavioural response to atmospheric conditions changed according to the landscape over which they were flying, switching between time (over the desert) and energy (over the Nile River) optimization strategies. Our results suggest that the interaction between landscape and atmospheric conditions depict a flexible, yet primarily time-dominated, migration optimization strategy. A free Plain Language Summary can be found within the Supporting Information of this article.
英文关键词	animal behaviour movement ecology Nile River pelican Sahara Desert
类型	Article
语种	英语
国家	Israel
收录类别	SCI-E
WOS记录号	WOS:000482856000001
WOS关键词	SEASONAL DIFFERENCES ; STOPOVER DECISIONS ; WEATHER CONDITIONS ; BIRDS ; FLIGHT ; MOVEMENT ; WIND ; LONG ; INFORMATION ; EXPENDITURE
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	Ben-Gurion University of the Negev ; Hebrew University of Jerusalem
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215849
作者单位	1.Hebrew Univ Jerusalem, Dept Ecol Evolut & Behav, Movement Ecol Lab, Edmond J Safra Campus, Jerusalem, Israel; 2.Israel Nat & Pk Author, Sci Div, Jerusalem, Israel; 3.Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Mitrani Dept Desert Ecol, Midreshet Ben Gurion, Israel
推荐引用方式 GB/T 7714	Efrat, Ron,Hatzofe, Ohad,Nathan, Ran. Landscape-dependent time versus energy optimizations in pelicans migrating through a large ecological barrier[J]. Ben-Gurion University of the Negev, Hebrew University of Jerusalem,2019,33(11):2161-2171.
APA	Efrat, Ron,Hatzofe, Ohad,&Nathan, Ran.(2019).Landscape-dependent time versus energy optimizations in pelicans migrating through a large ecological barrier.FUNCTIONAL ECOLOGY,33(11),2161-2171.
MLA	Efrat, Ron,et al."Landscape-dependent time versus energy optimizations in pelicans migrating through a large ecological barrier".FUNCTIONAL ECOLOGY 33.11(2019):2161-2171.