Inter-colony movements, at-sea behaviour and foraging in an immature seabird: results from GPS-PPT tracking, radio-tracking and stable isotope analysis

Inter-colony movements, at-sea behaviour and foraging in an immature seabird: results from GPS-PPT tracking, radio-tracking and stable isotope analysis
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未成熟海鸟的群体间运动、海上行为和觅食:GPS-PPT 跟踪、无线电跟踪和稳定同位素分析的结果

DOI:
10.1007/s00227-010-1563-9
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发表时间:
2010
期刊:
影响因子:
2.4
通讯作者:
Votier S
Votier S
中科院分区:
生物学2区
文献类型:
--
作者:
Votier S

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海鸟种群中含有大量未成熟的海鸟,在某些情况下,海鸟数量占种群中成年海鸟的 50% 以上。这些鸟类是海洋食物网的重要组成部分,可能有助于补偿性的补充和扩散,但仍然没有得到充分的研究。在这里,我们使用 GPS-PTT、无线电跟踪和稳定碳 (δ13C) 和氮 (δ15N) 同位素分析来研究未成熟海鸟的运动和觅食生态。我们的研究重点是未成熟的北方塘鹅,使用 2-4 只,在大型繁殖群旁边进行非繁殖聚集。对五只鸟的 GPS-PTT 跟踪显示,未成熟的鸟类有能力在繁殖季节广泛分散,其中一些个体可能会去其他栖息地寻找踪迹。然而,总体而言,未成熟的个体对捕获的群体非常忠诚。在返回焦点群体的过程中,幼鸟充当中心觅食者,进行循环和通勤飞行,对首次通过时间方差的分析揭示了区域限制搜索(ARS)行为的证据。此外,稳定的碳(δ13C)和氮(δ15N)同位素分析表明,未成熟动物与育种动物在同位素上是分离的。我们的研究结果提供了对未成熟海鸟的觅食、勘探和扩散行为的见解,这可能对了解海鸟生态和保护具有重要意义。
Seabird populations contain large numbers of immatures––in some instances comprising >50% of the fully grown adults in the population. These birds are significant components of marine food webs and may contribute to compensatory recruitment and dispersal, but remain severely understudied. Here, we use GPS-PTTs, radio-tracking and analysis of stable carbon (δ13C) and nitrogen (δ15N) isotopes to investigate the movements and foraging ecology of immature seabirds. Our study focussed on immature northern gannetsMorus bassanusaged 2–4 attending non-breeding aggregations alongside a large breeding colony. GPS-PTT tracking of five birds revealed that immatures have the ability to disperse widely during the breeding season, with some individuals potentially prospecting at other colonies. Overall, however, immatures were faithful to the colony of capture. During returns to the focal colony, immatures acted as central place foragers, conducted looping and commuting flights, and analysis of the variance in first-passage time revealed evidence of area-restricted search (ARS) behaviour. In addition, stable carbon (δ13C) and nitrogen (δ15N) isotope analyses indicate that immatures were isotopically segregated from breeders. Our findings provide insights into the foraging, prospecting and dispersal behaviour of immature seabirds, which may have important implications for understanding seabird ecology and conservation.
DOI: 10.1111/j.1365-2656.2009.01549.x
发表时间: 2009-07-01
影响因子: 4.8
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发表时间: 2001
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发表时间: 1992
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DOI: 10.1098/rspb.2002.2083
发表时间: 2002-08-22
影响因子: 4.7
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