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Evaluating the effect of distance to different food subsidies on the trophic ecology of an opportunistic seabird species
Journal of Zoology ( IF 1.9 ) Pub Date : 2020-01-26 , DOI: 10.1111/jzo.12759 N. Zorrozua 1 , A. Egunez 1 , A. Aldalur 1 , A. Galarza 2 , B. Diaz 1 , J. Hidalgo 3 , L. Jover 4 , C. Sanpera 4, 5 , I. Castège 6 , J. Arizaga 1
Journal of Zoology ( IF 1.9 ) Pub Date : 2020-01-26 , DOI: 10.1111/jzo.12759 N. Zorrozua 1 , A. Egunez 1 , A. Aldalur 1 , A. Galarza 2 , B. Diaz 1 , J. Hidalgo 3 , L. Jover 4 , C. Sanpera 4, 5 , I. Castège 6 , J. Arizaga 1
Affiliation
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The availability of food subsidies of anthropogenic origin has strong consequences on the trophic ecology and population dynamics of several opportunistic species. However, evidence suggests that the use of certain feeding sources is very local, and hence, potentially important food subsidies may have a relatively small area of influence, resulting in only limited impact from the large geographic‐scale perspective. In the south‐eastern part of the Bay of Biscay, the Yellow‐legged Gull Larus michahellis population is distributed across several colonies, which are located close to each other but have variable dependence on the landfills and fishing harbours in the area. This population is therefore a good model to test the influence of anthropogenic food subsidies on the trophic ecology of an opportunistic species at the local scale. Distance to the nearest fishing harbour showed a stronger effect on the diet of Yellow‐legged Gull chicks than distance to the nearest landfill site. Gulls notably reduced their consumption of marine prey (mostly comprised of fishing discards) in relation to decreasing distance of their colony to the nearest fishing harbour. This result has direct implications from a management standpoint, since fish discards were also found to have only a limited effect on diet at regional scales, but a very high impact at the local scale. Moreover, those colonies that consumed a higher proportion of marine prey showed better population trends. In line with European Union policies, a reduction in the availability of fish discards, together with the closure of landfill sites, will occur in the coming years, probably leading to a change in the trophic ecology and dynamics of Yellow‐legged Gull populations.
中文翻译：
评估距离不同食品补贴对机会性海鸟物种营养生态的影响
人为来源的食品补贴的可获得性对几种机会主义物种的营养生态和种群动态具有重大影响。但是，有证据表明，某些饲料来源的使用非常本地化，因此，潜在的重要食品补贴可能具有相对较小的影响范围，从较大的地理范围来看，其影响有限。在比斯开湾的东南部，黄腿鸥鸥人口分布在几个殖民地附近，这些殖民地彼此靠近，但对该地区的垃圾填埋场和渔港的依赖程度却各不相同。因此，该种群是一个很好的模型，可以在本地范围内测试人为食品补贴对机会性物种的营养生态的影响。距离最近的渔港对黄脚鸥雏鸡的饮食影响比距离最近的垃圾填埋场强。与殖民地到最近的渔港的距离减少相比，海鸥显着减少了对海洋猎物的消费（主要由捕鱼丢弃物组成）。从管理的角度来看，这一结果具有直接的意义，因为在区域范围内，还发现丢弃鱼对饮食的影响有限，但在当地范围内影响很大。此外，那些消耗了更多海洋猎物的殖民地显示出更好的人口趋势。根据欧洲联盟的政策，在未来几年中，将丢弃鱼的数量减少，同时关闭垃圾掩埋场，这可能导致黄足鸥种群的营养生态和动态发生变化。
更新日期：2020-01-26
中文翻译：
评估距离不同食品补贴对机会性海鸟物种营养生态的影响
人为来源的食品补贴的可获得性对几种机会主义物种的营养生态和种群动态具有重大影响。但是，有证据表明，某些饲料来源的使用非常本地化，因此，潜在的重要食品补贴可能具有相对较小的影响范围，从较大的地理范围来看，其影响有限。在比斯开湾的东南部，黄腿鸥鸥人口分布在几个殖民地附近，这些殖民地彼此靠近，但对该地区的垃圾填埋场和渔港的依赖程度却各不相同。因此，该种群是一个很好的模型，可以在本地范围内测试人为食品补贴对机会性物种的营养生态的影响。距离最近的渔港对黄脚鸥雏鸡的饮食影响比距离最近的垃圾填埋场强。与殖民地到最近的渔港的距离减少相比，海鸥显着减少了对海洋猎物的消费（主要由捕鱼丢弃物组成）。从管理的角度来看，这一结果具有直接的意义，因为在区域范围内，还发现丢弃鱼对饮食的影响有限，但在当地范围内影响很大。此外，那些消耗了更多海洋猎物的殖民地显示出更好的人口趋势。根据欧洲联盟的政策，在未来几年中，将丢弃鱼的数量减少，同时关闭垃圾掩埋场，这可能导致黄足鸥种群的营养生态和动态发生变化。
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