Population decline is linked to migration route in the Common Cuckoo.
Population decline is linked to migration route in the Common Cuckoo.
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DOI：
10.1038/ncomms12296
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发表时间：
2016-07-19
影响因子：
16.6
通讯作者：
Atkinson PW
中科院分区：
文献类型：
--
作者：
Hewson CM;Thorup K;Pearce-Higgins JW;Atkinson PW
在全球范围内，迁徙物种正在迅速减少。虽然大多数长途候鸟的死亡被认为是在迁徙期间发生的，但完全缺乏迁徙条件影响繁殖种群规模的证据。为了解决这一问题，我们在2011-2014年间的56次秋季迁徙中追踪了42只雄性杜鹃，这些杜鹃的数量在英国迅速下降。独一无二的是，这些鸟通过两条不同的路线到达相同的越冬地点，从而可以独立于来源和目的地来评估迁徙过程中的存活率。使用较短路线的鸟类在完成撒哈拉穿越(这两条路线遇到的主要生态屏障)之前的死亡率较高。使用这条路线的鸟类比例与当地九个繁殖种群的种群数量下降密切相关。因此，了解与可靠的种群变化数据有关的迁徙行为和表现的可变性，对于了解迁徙物种的种群数量下降和有效地确定养护资源的目标可能是必要的。长途迁徙所经历的条件是否会影响繁殖种群尚不清楚。在这里，作者追踪了从英国到非洲的迁徙的普通杜鹃，发现路线的选择会影响迁徙过程中的死亡率，以及这种夜间迁徙的鸟类的数量下降。
Migratory species are in rapid decline globally. Although most mortality in long-distance migrant birds is thought to occur during migration, evidence of conditions on migration affecting breeding population sizes has been completely lacking. We addressed this by tracking 42 male Common Cuckoos from the rapidly declining UK population during 56 autumn migrations in 2011–14. Uniquely, the birds use two distinct routes to reach the same wintering grounds, allowing assessment of survival during migration independently of origin and destination. Mortality up to completion of the Sahara crossing (the major ecological barrier encountered in both routes) is higher for birds using the shorter route. The proportion of birds using this route strongly correlates with population decline across nine local breeding populations. Knowledge of variability in migratory behaviour and performance linked to robust population change data may therefore be necessary to understand population declines of migratory species and efficiently target conservation resources. Whether conditions experienced on long-distance migrations affect breeding populations is not clear. Here, the authors tracked migrating Common Cuckoos from the UK to Africa and show that route choices affect mortality during migration, and population decline in this nocturnally migrating bird.