The impact of anthropogenic food subsidies on a generalist seabird during nestling growth.
The impact of anthropogenic food subsidies on a generalist seabird during nestling growth.
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DOI：
10.1016/j.scitotenv.2019.05.485
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
J. Lenzi;I. González‐Bergonzoni;E. Machín;B. Pijanowski;E. Flaherty
中科院分区：
文献类型：
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作者：
J. Lenzi;I. González‐Bergonzoni;E. Machín;B. Pijanowski;E. Flaherty
人为的食物补贴，如垃圾，是动物种群变化的重要驱动因素，海鸥大量以这种食物来源为食。在饲养期间对垃圾进行觅食可能会影响资源的获取，并可能造成人口统计学上的后果。利用常规饮食分析和海带鸥（Larus dominicanus）雏鸟血液中δ13C和δ15N的稳定同位素，研究了海带鸥（Larus dominicanus）在乌拉圭的里约热内卢de la Plata河口繁殖群中以垃圾为食对雏鸟生长的影响。利用同位素数据的贝叶斯混合模型，估计了天然食物和垃圾在雏鸟日粮中的比例和变化。然后，我们用不同尺寸的雏鸟形态测量数据，建立了食物源平均后验密度与其标准差之间的变化模型。我们发现，在海带海鸥的育雏过程中，垃圾是逐渐被输送到雏鸟体内的。此外，随雏鸟体型的增大，雏鸟组织中垃圾含量的变化也随之增加。我们认为，在雏鸟生长过程中，父母使用更多同位素独特的食物来源，从而增加了同位素多样性。这项研究强调有必要改进目前乌拉圭正在审查的废物管理系统。我们认为决策者应该考虑这项研究的结果，该研究表明垃圾通过环境科学尚未探索的机制直接影响沿海生态系统。
Anthropogenic food subsidies, such as refuse, are an important driver of animal population changes and gulls heavily forage on this food source. Foraging on refuse during the rearing period could affect the acquisition of resources with potential demographic consequences. Using conventional diet analysis and stable isotopes of δ13C and δ15N of blood of Kelp Gull (Larus dominicanus) nestlings, we studied the variation of the chick growth in response to foraging on refuse on a reproductive colony in the Rio de la Plata Estuary in Uruguay. Using Bayesian mixing models on isotopic data, we estimated the proportion and variation of natural food and refuse in the diet of nestlings. Then, we modelled the variation between the mean posterior densities of the food sources and their standard deviation with the nestling morphometric measurements of different sizes. We found that refuse was gradually delivered to Kelp Gull nestlings during the chick rearing period. Additionally, variation of refuse incorporated into nestling tissues increased with nestlings' size. We propose that parents use more isotopically unique food sources during the nestling growth thereby increasing isotopic diversity. This study highlights the need to improve the current waste management system, which is being reviewed in Uruguay. We believe that decision makers should consider the results of this study, which show that refuse is directly impacting coastal ecosystems through mechanisms poorly explored by the environmental sciences.