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Birds

机译：鸟类

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Recent studies have shown that pelagic seabirds with little breeding experience are wide ranging individuals exploring different foraging grounds and occupying generally more pelagic habitats than more experienced birds. This study compared the spatial dynamic of the year-round distribution and behaviour between two different population components: experienced (Exp; ＞2 years of successful breeding) and inexperienced (Inexp; ≤2 successful years) Cory's shearwaters (Calonectris borealis) individuals from Berlenga Island, offshore the Portuguese coast. Our aim was to verify the occurrence of variations in the at-sea activity, foraging habitats and isotopic niches of Exp (N = 11) and Inexp (N = 11) individuals, during their breeding and non-breeding phases. Our results confirmed differences in the migratory routes and foraging grounds during the annual cycle between these two population components: Inexp birds exhibited a more pelagic behaviour than Exp birds, with extensive migratory routes, marked by several stopovers, and a higher number of non-breeding areas. Exp individuals migrated through shorter routes, and wintered in fewer locations. Exp individuals foraged on coastal, shallow and cold water areas and showed higher carbon and nitrogen isotopic values, while Inexp birds foraged more on pelagic, windy and frontal zones and exhibited lower carbon and nitrogen isotopic values. Our results suggest that experience plays a relevant role in explaining the spatial distribution and behaviour of pelagic seabirds such as Cory's shearwaters. Future research with larger sample sizes should focus on comparing the behaviour of juvenile, immature, first-time breeders and breeders with increasing experience and age.
机译：最近的研究表明，几乎没有繁殖经验的远洋海鸟比有经验的海鸟有更多的个体探索不同的觅食地，并且通常占据更多的远洋栖息地。这项研究比较了两个不同种群组成部分之间全年分布和行为的空间动态：有经验的（Exp；成功育种＞ 2年）和没有经验的（Inexp；≤2个成功年）来自Berlenga的Cory剪力水（Calonectris borealis）。岛，葡萄牙海岸近海。我们的目的是验证在繁殖和非繁殖阶段，Exp（N = 11）和Inexp（N = 11）个体在海上活动，觅食栖息地和同位素生态位的变化的发生。我们的研究结果证实了这两个种群组成部分在年度循环中的迁徙路线和觅食地的差异：与Exp鸟相比，Inexp禽类表现出更多的中上层行为，具有广泛的迁徙路线，具有多次中途停留和大量非繁殖地区。经验丰富的人员通过较短的路线迁移，并在较少的地点越冬。在沿海，浅水和冷水地区觅食的Exp个体显示较高的碳和氮同位素值，而Inexp鸟类在中上层，大风和锋面区域觅食更多，并且碳和氮同位素值较低。我们的结果表明，经验在解释中上层海鸟（如科里切尔沃特斯）的空间分布和行为方面具有重要作用。未来以较大样本量进行的研究应侧重于比较少年，未成熟，初次育种者和经验和年龄增加的育种者的行为。

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    《Oceanographic Literature Review》 |2016年第2期|369-371|共3页
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