Full-year tracking suggests endogenous control of migration timing in a long-distance migratory songbird
Full-year tracking suggests endogenous control of migration timing in a long-distance migratory songbird
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全年追踪表明长距离迁徙鸣禽对迁徙时间的内源控制
DOI：
10.1007/s00265-018-2553-z
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发表时间：
2018
影响因子：
2.3
通讯作者：
A. P. Tøttrup
中科院分区：
文献类型：
--
作者：
Lykke Pedersen;Kayla Jackson;K. Thorup;A. P. Tøttrup
随着技术的不断进步，关于个人移徙流动的全年跟踪数据越来越多。这为研究连续几年内个人内部的移民发展以及移民计划受到限制的程度提供了机会。这种知识对于了解个人在年度周期内的灵活程度至关重要，这可能有助于查明个人决定范围受到限制的潜在瓶颈。在这项研究中，我们调查重复性的时间长距离迁徙鸣禽，红背伯劳Lanius collurio，连续几年（n = 7）跟踪。此外，我们探讨了人口的变异性和连续事件之间的依赖关系，离开和到达整个年度周期在这个物种（n = 15）。我们发现，在撒哈拉以南非洲的两个主要的非繁殖区的出发时间的个人表现出很高的可重复性。相反，低重复性被发现在整个年度周期到达固定站点的时间。在所有事件中，出发和到达时间的人群差异相似，范围为30 - 41天，并且高度依赖于先前事件的时间。我们的结论是，出发的时间可能是由个人先天的迁移程序控制的关键事件，而到达更灵活，可能取决于在红背伯劳途中经历的环境条件。尽管如此，在个人的时间表明显的灵活性可能会受到阻碍的年度cycle.Significance StatementThe年度迁徙迁徙动物的迁徙时间表是由内源性和外源性因素相结合。了解个人内部和之间的时间动态在整个年度周期是重要的，以评估在何种程度上的迁移时间表是在时间上的限制。通过使用连续几年跟踪的单个红背伯劳的全年周期跟踪数据，我们发现，个体在决定离开撒哈拉以南非洲的主要非繁殖区时具有高度一致性，而到达者在整个年度周期中不太一致。总体而言，迁移时间表在整个年度周期内受到高度限制，每次抵达和离开都取决于前一次事件。我们的研究结果表明，离开决定是潜在的内源性控制，在整个复杂的移民系统中几乎没有灵活性。
Following ongoing technological advances, an increasing amount of full-year tracking data on individual migratory movements is becoming available. This opens up the opportunity to study how migration develops within individuals in consecutive years and the extent to which the migratory program is constrained. Such knowledge is essential for understanding the degree of individual flexibility during the annual cycle, which may help identifying potential bottlenecks, where the range of individual decisions is restricted. In this study, we investigate repeatability in time of a long-distance migratory songbird, the red-backed shrike Lanius collurio, tracked across consecutive years (n = 7). Furthermore, we explore the population variability and dependencies between consecutive events of departure and arrival throughout the annual cycle in this species (n = 15). We find that individuals show high repeatability in timing of departure from their two main non-breeding areas in sub-Saharan Africa. In contrast, low repeatability is found in timing of arrivals to stationary sites throughout the annual cycle. Population variation in timing of departure and arrival was similar across all events, ranging from 30 to 41 days, and was highly dependent on timing of preceding events. We conclude that timing of departures is the key event potentially controlled by the individual innate migration program, while arrivals are more flexible, likely dependent on the environmental conditions experienced en route in red-backed shrikes. Still, apparent flexibility in the individual schedule may be hampered by overall constraints of the annual cycle.Significance statementThe annual migration schedule of migratory animals is controlled by a combination of endogenous and exogenous factors. Understanding the temporal dynamics within and between individuals across the annual cycle is important to assess to which extent the migratory schedule is constrained in time. By using full-annual cycle tracking data of individual red-backed shrikes tracked across consecutive years, we find that individuals are highly consistent in their decision to depart from their main non-breeding areas in sub-Saharan Africa, whereas arrivals are less consistent throughout the annual cycle. Overall, the migration schedule is highly constrained across the annual cycle, with each arrival and departure event being dependent on the previous event. Our results suggest that departure decision is underlying endogenous control and that little flexibility is available throughout this complex migration system.
影响因子：
6.6
作者：
Stoffel, Martin A.;Nakagawa, Shinichi;Schielzeth, Holger
通讯作者：
Schielzeth, Holger