Individual consistency in migratory behaviour of a pelagic seabird
Individual consistency in migratory behaviour of a pelagic seabird
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远洋海鸟迁徙行为的个体一致性
DOI：
10.1163/1568539x-00003163
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发表时间：
2014
期刊：
影响因子：
1.3
通讯作者：
Maki Yamamoto and Philip N. Trathan
中科院分区：
文献类型：
--
作者：
Takashi Yamamoto;Akinori Takahashi;Katsufumi Sato;Nariko Oka;Maki Yamamoto and Philip N. Trathan
许多动物在繁殖区和越冬区之间迁徙；然而，在连续的年份之间，每只动物的行为在空间和时间上是否一致，我们还不太清楚。此外，在试图理解可能影响后续行为的一致的个体行为差异时，通常不考虑先前的繁殖状态（成功或失败）。在2006年至2010年期间，我们使用地理定位器跟踪了一种远洋海鸟的迁徙运动，条纹鹱（calonectris leucomelas）被跟踪了两年或更长时间，其中包括23只在两个季节生孩子的鸟和23只在一个季节生孩子的鸟。除1只外，所有个体均迁移到相同的广阔越冬区，其迁徙路线和越冬分布中心与以往的繁殖结果没有变化。在这两年中都有雏鸟的个体的迁徙时间表（离开繁殖地的日期，向南和向北迁徙的日期，以及第一次返回繁殖地的日期）在年份之间没有显着差异，而失败的个体离开繁殖地，似乎比前一年更早开始向南迁徙。尽管如此，无论之前的繁殖结果如何，个体（包括雄性和雌性）向南迁徙的时间在连续几年中是一致的，而且对于前几年都有小鸡，后两个季节都有蛋的雌性来说，第一次返回殖民地的时间也是一致的。这可能意味着个体特有的广泛时间安排的存在，可能是一种年轮节律，尽管生态条件可能会影响实际出发事件的确切时间。我们的研究结果表明，在繁殖季节之外，这种远洋海鸟的个体行为是高度一致的。
Many animals migrate between breeding and wintering areas; however, whether each animal behaves consistently in space and time between consecutive years is less well understood. Furthermore, previous breeding state (successful or failed) is often not considered when attempting to understand consistent individual differences in behaviour that are likely to impact upon the subsequent behaviour. Between 2006 and 2010, we used geolocators to track the migratory movements of a pelagic seabird, the streaked shearwaterCalonectris leucomelas, with individuals () being followed for two years or more, including 23 birds that had chicks in two seasons and 23 birds in just one season. All individuals, except for one bird, migrated to the same broad wintering areas, and their migratory route as well as the centre of wintering distribution did not change in relation to the previous breeding outcomes. Migration schedules (dates of departure from the breeding colony, southward and northward migrations, and first return to the colony) did not differ significantly between years for individuals that had chicks during both years, while failed individuals left the breeding colony and appeared to start the southward migration at an earlier date than the previous successful year. Nonetheless, the timing of the southward migration was consistent within individuals, including both males and females, over successive years regardless of the previous breeding outcome, and also the timing of first return back to the colony for females that had chicks in the both previous years and eggs in the both following season. This may imply the existence of individual-specific broad time schedules, possibly a circannual rhythm, though ecological conditions might affect the exact timing of the actual departure event. Our results present evidence for high levels of individually consistent behaviour for this pelagic seabird outside the breeding season.