SummaryAlien species are a driver of biodiversity loss, with impacts of different aliens on native species varying considerably. Identifying the contributions of alien species to native species declines could help target management efforts. Globally, seabirds breeding on islands have proven to be highly susceptible to alien species. The breeding colonies of the pink-footed shearwater (Ardenna creatopus) are threatened by the negative impacts of alien mammals. We combined breeding monitoring data with a hierarchical model to separate the effects of different alien mammal assemblages on the burrow occupancy and hatching success of the pink-footed shearwater in the Juan Fernández Archipelago, Chile. We show that alien mammals affected the rates of burrow occupancy, but had little effect on hatching success. Rabbits produced the highest negative impacts on burrow occupancy, whereas the effects of other alien mammals were more uncertain. In addition, we found differences in burrow occupancy between islands regardless of their alien mammal assemblages. Managing rabbits will improve the reproductive performance of this shearwater, but research is needed to clarify the mechanisms by which alien mammals affect the shearwaters and to explain why burrow occupancy varies between islands.

中文翻译：

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外星哺乳动物聚集对智利脆弱的粉足海鸥的洞穴占有率和孵化成功率的影响

摘要外来物种是生物多样性丧失的驱动因素，不同外来物种对本地物种的影响差异很大。确定外来物种对本地物种减少的贡献可以帮助目标管理工作。在全球范围内，在岛屿上繁殖的海鸟已被证明对外来物种高度敏感。粉红脚鹱的繁殖群（阿登纳) 受到外来哺乳动物负面影响的威胁。我们将繁殖监测数据与分层模型相结合，以区分不同外来哺乳动物组合对智利胡安费尔南德斯群岛粉足海鸥的洞穴占有率和孵化成功率的影响。我们发现外来哺乳动物影响了洞穴占用率，但对孵化成功几乎没有影响。兔子对洞穴占有率的负面影响最大，而其他外来哺乳动物的影响则更不确定。此外，我们发现岛屿之间的洞穴占有率存在差异，无论它们的外来哺乳动物组合如何。管理兔子将提高这种海鸥的繁殖性能，