Migratory connectivity in Arctic geese: spring stopovers are the weak links in meeting targets for breeding
Migratory connectivity in Arctic geese: spring stopovers are the weak links in meeting targets for breeding
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DOI：
10.1007/s10336-007-0223-4
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发表时间：
2007-12-01
影响因子：
1.3
通讯作者：
Stahl, J.
中科院分区：
文献类型：
--
作者：
Drent, R. H.;Eichhorn, G.;Stahl, J.
将北极繁殖鹅的春季迁徙路线与它们最终的繁殖成功联系起来，提供了证据表明，在中途停留地身体储存（蛋白质、脂肪）的积累至关重要。我们表明，这是因为在北极筑巢的鹅至少部分依赖于这些储存来合成卵和支持孵化（对于雌性来说，是饥饿阶段）。对成功繁殖（卵+孵化）所需的身体储存量与这些储存量的测量积累率的估计清楚地表明，仅通过在繁殖地喂养来满足需求对于鹅来说不是一个选择。时间限制不允许这样做，因为在北极，为了确保后代的生存，必须尽早产蛋。尽管父母可以沿着迁徙路线利用早春的生长，但当它们到达繁殖地时，它们会领先于生长浪潮，因此只能通过利用身体储备来满足父母的时间表。对六种鹅的跟踪研究结果强调了这样的结论：卵的形成是在到达筑巢群之前沿着迁徙路线开始的。在某些情况下，蛋成分和亲本身体组织中稳定同位素的特征与饲料植物中的特征相关，支持混合内源/外源来源的概念。迁徙时间与春季植物性食物的大量供应之间的密切配合使得鹅特别容易受到气候变化的影响。东北大西洋迁徙路线上的不匹配现象日益严重，欧洲西北部的变暖趋势与北极目标地区的稳定甚至变冷趋势相冲突。
Linking spring migratory itineraries of individual Arctic-breeding geese to their eventual breeding success has provided evidence that accumulation of body stores (protein, fat) at stop-over sites is crucial. We show that this is because geese nesting in the Arctic depend at least in part on these stores for synthesis of eggs and supporting incubation (for the female, a phase of starvation). Estimates of the body stores needed for successful reproduction (eggs + incubation) in relation to measured rates of accumulation of these stores make clear that meeting the demands solely by feeding at the breeding grounds is not an option for geese. The time constraint does not allow this, because early laying is a necessity in the Arctic to ensure survival of the progeny. Although the parents can exploit the early spring growth along the flyway, they get ahead of the wave of growth when they arrive on the breeding site and hence the parental timetable can only be met by drawing on body stores. Results from tracking studies in six goose species underline the conclusion that egg formation commences along the flyway before arrival at the nesting colony. In some cases, signatures of stable isotopes in egg components and parental body tissues in relation to the signature in forage plants support the notion of a mixed endogenous/exogenous origin. The close match between migratory timing and the spring flush of plant foods makes geese particularly vulnerable to the impact of climate change. There is an increasing mismatch along the NE Atlantic Flyway, where a warming trend in NW Europe conflicts with stable or even cooling trends in the Arctic target areas.