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首页> 外文会议> >Feeding Ecology Of Yellow-legged Gullslarus Michahellis In The Western Mediterranean: a Comparative Assessment Using Conventional and Isotopic Methods
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Feeding Ecology Of Yellow-legged Gullslarus Michahellis In The Western Mediterranean: a Comparative Assessment Using Conventional and Isotopic Methods

机译：地中海西部黄足鸥Michahellis的饲养生态：使用常规方法和同位素方法的比较评估

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Accurate determination of feeding habits using only conventional dietary analysis is usually difficult, due to both biases caused by prey digestibility differences and to the discrete aspect of the sampling. However, combining conventional methods with stable isotope analysis provides an integrated view of the assimilated diet. Here, we measured stable isotope ratios of carbon (δ~(13)C), nitrogen (δ~(15)N) and sulphur (δ~(34)S) in feathers of yellow-legged gull Larus michahellis nestlings from 4 colonies along the western Mediterranean coast, where the gulls consume different proportions of marine, terrestrial and garbage resources. We collected and analysed chicks' regurgitates in each colony, thereby determining the isotopic signatures in a significant sample of prey. By applying a mixing model to our isotopic values, we compared the information provided by the 2 methodologies. According to direct prey sampling and the particular conditions of the breeding areas, populations with more enriched δ~(34)S values consumed a diet richer in marine prey, with lower δ~(15)N signatures indicating garbage consumption. The main pattern resulting from the mixing model agreed with direct diet sampling. However, estimated proportions for small-sized prey were controversial, which indicates that small, soft prey items might be underestimated by regurgitate analysis. We conclude that stable isotope signatures and the use of mixing models are useful tools for the rapid assessment of feeding ecology in certain populations. Solving analytical biases should be considered in future feeding studies, thereby saving time and minimising bird disturbance by using an isotopic methodology.
机译：由于猎物消化率差异引起的偏差以及采样的离散性，通常仅使用常规饮食分析来准确确定喂养习惯通常是困难的。但是，将常规方法与稳定同位素分析相结合，可以提供同化饮食的完整视图。在这里，我们测量了来自4个殖民地的黄腿鸥Lacha michahellis雏鸟的羽毛中碳（δ〜（13）C），氮（δ〜（15）N）和硫（δ〜（34）S）的稳定同位素比沿地中海西部海岸，海鸥消耗了不同比例的海洋，陆地和垃圾资源。我们收集并分析了每个菌落中小鸡的反流现象，从而确定了大量猎物中的同位素特征。通过将混合模型应用于我们的同位素值，我们比较了两种方法学提供的信息。根据直接的猎物采样和繁殖地区的特定条件，δ〜（34）S值更丰富的种群所食用的饮食中富含海洋猎物，而δ〜（15）N签名越低表示垃圾的消耗。混合模型产生的主要模式与直接饮食采样相吻合。但是，估计小型猎物的比例是有争议的，这表明通过反流分析可能会低估小型，柔软的猎物。我们得出的结论是，稳定的同位素特征和混合模型的使用对于某些人群的饲料生态学快速评估是有用的工具。在未来的喂养研究中应考虑解决分析偏差，从而通过使用同位素方法节省时间并最大程度地减少鸟类干扰。

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