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首页> 外文期刊>Bird Study >Breeding season diets of sympatric White-tailed Eagles and Golden Eagles in Scotland: no evidence for competitive effects.
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Breeding season diets of sympatric White-tailed Eagles and Golden Eagles in Scotland: no evidence for competitive effects.

机译：同胞白尾鹰和金鹰在苏格兰的繁殖季节饮食：没有竞争作用的证据。

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摘要

Capsule: The breeding season diets of White-tailed Eagles and Golden Eagles in western Scotland were different, and there was no evidence of competition between the two species. Aim: To test the hypothesis that the reintroduced White-tailed Eagles will have an adverse effect on Golden Eagles through competition for food. Methods: Collections of prey remains at nests and regurgitated pellets during the breeding season were analysed. Temporal change in Golden Eagle territory occupancy and breeding productivity where the influence of White-tailed Eagles should be most evident was also examined. Results: Diet breadth was similar between species but diet composition was significantly different, with White-tailed Eagles taking more sheep and aquatic or coastal food items, whereas Golden Eagles took more gamebirds (Galliformes), lagomorphs and other terrestrial prey. Diet overlap comparisons, between species-pairs that nested close together or far apart, rejected a hypothesis that there was competition for food, but partially supported an alternative hypothesis that diet overlap indicated abundant shared food. There was no indication that White-tailed Eagles have had any long-term effect on the breeding productivity or abundance of territorial Golden Eagles. Conclusions: There is no evidence that reintroduced White-tailed Eagles are having an adverse effect on Golden Eagles through competition.
机译：胶囊：苏格兰西部的白尾鹰和金鹰的繁殖季节饮食不同，没有证据表明这两个物种之间存在竞争。目的：检验以下假设：重新引入的白尾鹰会通过争夺食物而对金鹰产生不利影响。方法：分析繁殖季节在巢中的猎物残骸和反流的颗粒物。还研究了金鹰地区占有率和繁殖生产力的时间变化，其中白尾鹰的影响应该最为明显。结果：不同物种之间的饮食广度相似，但饮食组成却存在显着差异，其中白尾鹰摄取更多的绵羊和水生或沿海食物，而金鹰摄取更多的猎鸟（Galliformes），泻湖类和其他陆生猎物。在相互靠近或相隔很远的物种对之间的饮食重叠比较，拒绝了存在食物竞争的假设，但部分支持了饮食重叠表明共享食物丰富的另一种假设。没有迹象表明白尾鹰对繁殖能力或领土金鹰的丰富有长期影响。结论：没有证据表明重新引入的白尾鹰通过竞争对金鹰有不利影响。

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