Coping with Shifting Nest Predation Refuges by European Reed Warblers Acrocephalus scirpaceus
Coping with Shifting Nest Predation Refuges by European Reed Warblers Acrocephalus scirpaceus
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DOI：
10.1371/journal.pone.0115456
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发表时间：
2014-12-18
期刊：
影响因子：
3.7
通讯作者：
Sztwiertnia, Hanna
中科院分区：
文献类型：
--
作者：
Halupka, Lucyna;Halupka, Konrad;Sztwiertnia, Hanna
捕食是鸟类巢死亡的最重要原因，在过去的几十年里，捕食一直是众多研究的主题。然而，变化的捕食压力和父母的反应之间的时间动态仍然知之甚少。我们分析了524巢监测欧洲苇莺在同一地区连续6个繁殖季节的特点，并发现了一些支持移动巢捕食避难所假说。巢址特征与巢穴命运相关，但具有相同巢址属性的巢穴在一个季节可能相对安全，而在另一个季节则容易受到捕食。因此，巢捕食避难所是短暂的，并没有在巢捕食模式的季节之间的一致性。芦苇莺，失去了他们的第一个巢在一个特定的季节没有分散进一步为随后的生殖尝试，成功的个人相比，但他们介绍了更多的变化，他们的第二个巢址。在随后的巢，捕食风险保持不变的鸟类改变巢址的特点，但增加了那些没有。在季节间的时间尺度上，个别鸟类并没有表现出更好的年龄在减少巢捕食风险。我们的结论是，考虑到巢穴捕食避难所并不稳定，前几年获得的经验可能没有用。
Predation, the most important source of nest mortality in altricial birds, has been a subject of numerous studies during past decades. However, the temporal dynamics between changing predation pressures and parental responses remain poorly understood. We analysed characteristics of 524 nests of European reed warblers monitored during six consecutive breeding seasons in the same area, and found some support for the shifting nest predation refuge hypothesis. Nest site characteristics were correlated with nest fate, but a nest with the same nest-site attributes could be relatively safe in one season and vulnerable to predation in another. Thus nest predation refuges were ephemeral and there was no between-season consistency in nest predation patterns. Reed warblers that lost their first nests in a given season did not disperse farther for the subsequent reproductive attempt, compared to successful individuals, but they introduced more changes to their second nest sites. In subsequent nests, predation risk remained constant for birds that changed nest-site characteristics, but increased for those that did not. At the between-season temporal scale, individual birds did not perform better with age in terms of reducing nest predation risk. We conclude that the experience acquired in previous years may not be useful, given that nest predation refuges are not stable.