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首页> 外文期刊>Marine biology >Foraging strategies of a generalist seabird species, the yellow-legged gull, from GPS tracking and stable isotope analyses
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Foraging strategies of a generalist seabird species, the yellow-legged gull, from GPS tracking and stable isotope analyses

机译：GPS追踪和稳定同位素分析得出的多用途海鸟物种黄足鸥的觅食策略

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摘要

Generalist and opportunistic species, such as the yellow-legged gull Larus michahellis, can feed on a wide variety of food from both marine and terrestrial origins. This work evaluates the potential foraging strategies (terrestrial, mix and marine) of the yellow-legged gull during the breeding season, in Berlenga (39 degrees 24'55 '' N, 9 degrees 30'28 '' W) and Deserta (36 degrees 57'45 '' N, 7 degrees 53'29 '' W) Islands, Portugal, across 2011-2016. Stable isotope analyses (delta C-13 and delta N-15) of plasma and blood cells were performed to estimate the proportion of individuals pursuing each strategy based on discrimination analyses. For that, GPS loggers were used to assess individual foraging destinations. Overall, this study discriminated well the foraging strategies adopted by gulls through stable isotope analyses (estimated error of 16.7%). Results indicated a variation in foraging strategies across years and between colonies. As expected, this variation was influenced by oceanographic conditions and availability of marine food sources nearby the colonies. The isotopic niche of yellow-legged gulls pursuing a marine strategy was much smaller than the niche of gulls with a terrestrial strategy, but surprisingly only slight smaller than the niche of gulls pursuing a mixed strategy. Gulls adopting a terrestrial strategy fed on a wide variety of foods, which greatly influenced the amplitude of the isotopic values, and respective isotopic niche width. On the other hand, gulls adopting a mix strategy might be very selective in the consumption of foods, taking great advantage of their potential plasticity on both marine and terrestrial environments. This study highlights an overall preference for the marine and mix strategies in yellow-legged gulls.
机译：通体和投机性物种，例如黄腿鸥Larus michahellis，可以以海洋和陆地来源的多种食物为食。这项工作评估了繁殖季节在Berlenga（39度24'55''N，9度30'28''W）和Deserta（36）的黄腿鸥在繁殖季节的潜在觅食策略（陆地，混合和海洋）在2011-2016年间，葡萄牙的岛屿度为57'45英寸'N，7度53'29英寸'W）。对血浆和血细胞进行了稳定的同位素分析（δC-13和δN-15），以基于区分分析来估计采用每种策略的个体比例。为此，使用了GPS记录器来评估各个觅食目的地。总体而言，本研究通过稳定的同位素分析很好地区分了海鸥采用的觅食策略（估计误差为16.7％）。结果表明，不同年份之间以及不同菌落之间的觅食策略都有差异。如预期的那样，这种变化受到海洋条件和殖民地附近海洋食物来源的可用性的影响。追求海洋策略的黄腿鸥的同位素位置远小于采用陆地策略的海鸥的位置，但令人惊讶的是，仅比追求混合策略的海鸥的位置小。海鸥采取陆生策略，以多种食物为食，这极大地影响了同位素值的幅度以及相应的同位素生态位宽度。另一方面，采取混合策略的海鸥在食用食物时可能会非常有选择性，这要充分利用它们在海洋和陆地环境中的潜在可塑性。这项研究突出了对黄脚海鸥的海洋和混合策略的总体偏好。

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