Arid
DOI10.1111/j.1600-048X.2013.00345.x
Body composition of north and southbound migratory blackcaps is influenced by the lay-of-the-land ahead
Wojciechowski, Michal S.1; Yosef, Reuven2; Pinshow, Berry3
通讯作者Wojciechowski, Michal S.
来源期刊JOURNAL OF AVIAN BIOLOGY
ISSN0908-8857
EISSN1600-048X
出版年2014
卷号45期号:3页码:264-272
英文摘要

The annual migration of small birds depends on the optimal management of time and energy. Since refueling at stopovers between flights consumes most of the birds’ time and energy, selection of food-rich sites, and timely departure therefrom are likely crucial to success. We examined this concept quantifying body composition of 200 migrating blackcaps, Sylvia atricapilla, in Eilat, Israel, using dual-energy x-ray absorptiometry and generated a model to predict body composition as it changes with body mass (m(b)). We then back-calculated body composition of > 20 000 blackcaps ringed between 1984 and 2005, and tested the hypothesis that the amount of fuel that a bird stores determines the length of its stopover. We predicted that 1) if time-constrained in spring, birds at the stopover site carry less than a maximum fuel load, but 2) if not time-constrained, as in autumn, their fuel load is much higher than in spring. We found the change in body composition of blackcaps to be biphasic and correlated with increasing m(b). At m(b) < 17.8 g, increasing m(b) is due to increasing lean mass (m(l)), while at m(b) > 17.8 g increasing m(b) results from increasing fat mass (m(f)), which is accompanied by decreasing m(l). Body composition of blackcaps at a spring stopover site indicates that blackcaps leave stopovers as soon as they regain functionality of their digestive systems, but before laying down much m(f). In autumn blackcaps arrive with fuel stores much larger than in spring. For these birds, the Eilat stopover apparently serves to complete fat accumulation before crossing the deserts ahead. We conclude that in spring, the decision to depart is not determined by the bird’s fuel stores, especially when early arrival at the breeding site, and therefore time, is of the essence. In autumn, accumulating enough fuel to ensure successful crossing of the deserts ahead probably dictates stopover time.


类型Article
语种英语
国家Poland ; Israel
收录类别SCI-E
WOS记录号WOS:000335401300007
WOS关键词X-RAY ABSORPTIOMETRY ; PASSERINE BIRDS ; SYLVIA-BORIN ; SPRING MIGRATION ; PHENOTYPIC FLEXIBILITY ; GARDEN WARBLERS ; STOPOVER SITES ; MASS ; FAT ; FLIGHT
WOS类目Ornithology
WOS研究方向Zoology
来源机构Ben-Gurion University of the Negev
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/183122
作者单位1.Nicolaus Copernicus Univ, Fac Biol & Environm Protect, Dept Anim Physiol, PL-87100 Torun, Poland;
2.Ben Gurion Univ Negev, Dept Life Sci, IL-88000 Il Eilat, Israel;
3.Ben Gurion Univ Negev, Mitrani Dept Desert Ecol, Jacob Blaustein Inst Desert Res, IL-84990 Midreshet Ben Gurion, Israel
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GB/T 7714
Wojciechowski, Michal S.,Yosef, Reuven,Pinshow, Berry. Body composition of north and southbound migratory blackcaps is influenced by the lay-of-the-land ahead[J]. Ben-Gurion University of the Negev,2014,45(3):264-272.
APA Wojciechowski, Michal S.,Yosef, Reuven,&Pinshow, Berry.(2014).Body composition of north and southbound migratory blackcaps is influenced by the lay-of-the-land ahead.JOURNAL OF AVIAN BIOLOGY,45(3),264-272.
MLA Wojciechowski, Michal S.,et al."Body composition of north and southbound migratory blackcaps is influenced by the lay-of-the-land ahead".JOURNAL OF AVIAN BIOLOGY 45.3(2014):264-272.
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