Effects of post-breeding moult and energetic condition on timing of songbird migration into the tropics
Effects of post-breeding moult and energetic condition on timing of songbird migration into the tropics
复制标题
繁殖后换羽和能量条件对鸣禽迁徙到热带地区时间的影响
DOI：
10.1098/rspb.2010.1220
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
V. Afanasyev
中科院分区：
文献类型：
--
作者：
B. Stutchbury;Elizabeth A. Gow;Tyler Done;M. MacPherson;J. Fox;V. Afanasyev
每年秋天，数十亿的鸣禽在温带和热带之间迁徙，但人们对繁殖地的事件如何影响向热带的迁徙知之甚少。在这里，我们使用光级geolocators跟踪秋季迁徙的木画眉Hylocichla mustelina和测试的第一次，如果晚换羽和不良的生理条件之前，迁移延迟到达冬季领土。筑巢较晚的画眉推迟了羽毛换羽，8月份换羽较晚的鸟类在10月10日前往热带的途中明显向北移动。8月份能量状况相对较差的个体（高β-羟基丁酸酯，低甘油三酯，窄羽毛生长条）在10月份进入热带明显较晚。然而，晚换羽和迁移前的条件差，并没有导致晚到达的冬季领土，因为中途停留时间是高度可变的迁移后期。虽然结转效应从冬季领土春季迁移可能是强大的迁徙鸣禽，我们的研究表明，高繁殖努力在本赛季后期不施加时间限制，延迟冬季领土收购。
Each autumn billions of songbirds migrate between the temperate zone and tropics, but little is known about how events on the breeding grounds affect migration to the tropics. Here, we use light level geolocators to track the autumn migration of wood thrushes Hylocichla mustelina and test for the first time if late moult and poor physiological condition prior to migration delays arrival on the winter territory. Late nesting thrushes postponed feather moult, and birds with less advanced moult in August were significantly farther north on 10 October while en route to the tropics. Individuals in relatively poor energetic condition in August (high β-Hydroxybutyrate, low triglyceride, narrow feather growth bars) passed into the tropics significantly later in October. However, late moult and poor pre-migratory condition did not result in late arrival on the winter territory because stopover duration was highly variable late in migration. Although carry-over effects from the winter territory to spring migration may be strong in migratory songbirds, our study suggests that high reproductive effort late in the season does not impose time constraints that delay winter territory acquisition.