ABSTRACT Many alien species are safe in their native ranges, but some are threatened. This creates a conundrum for conservation and invasion science. We analyzed the distributions, introduction pathways, threats, and conservation strategies of threatened mammals with alien populations globally. We reassessed their hypothetical IUCN Red List category including the alien part of the range. Among 230 alien mammals, 36 are threatened in their native range, either critically endangered (17%), endangered (25%), or vulnerable (58%). These species were mainly introduced for hunting and exchanged within Asia, with introduced ranges concentrated in south‐eastern Asia and eastern Australia. They face multiple threats, particularly from biological resource use. Conservation strategies are mainly related to species management. Including alien populations in the assessments reduces extinction risk of 22% of the species. Although some of these alien populations may have conservation value, conservation managers should carefully consider them on a case‐by‐case basis to avoid negative impacts on biodiversity.

Lisa Tedeschi

Bernd Lenzner

Anna Schertler

Dino Biancolini

Franz Essl

Carlo Rondinini

Conservation Letters

CONSERVATION LETTERS 是一本科学期刊，发表对保护生物多样性具有重要意义的实证和理论研究。该杂志欢迎生物和社会科学领域的投稿——尤其是跨学科投稿——推动务实的保护目标和科学理解。手稿将按快速沟通时间表发布，因此应该是最新的和热门的。研究文章应该清楚地阐明他们的发现对保护政策和实践的重要性。

Conservation Letters is a scientific journal dedicated to publishing empirical and theoretical research that is significant for the conservation of biodiversity. The journal welcomes submissions from the fields of biological and social sciences, particularly interdisciplinary studies, to advance practical conservation goals and scientific understanding. Manuscripts will be published on a rapid communication timeline, so they should be current and relevant. Research articles should clearly articulate the importance of their findings for conservation policy and practice.

《Conservation Letters》是一本科学期刊，专注于发表对保护生物多样性具有重要意义的实证和理论研究。该期刊欢迎生物科学和社会科学领域的投稿，尤其鼓励跨学科的研究，以推动务实的保护目标和科学理解。手稿将按照快速沟通的时间表发布，因此应确保内容是最新和热门的。研究文章需清晰阐明其发现对保护政策和实践的重要性。

Category	Quartile
环境科学与生态学	1
环境科学与生态学, 生物多样性保护	1

Threatened Mammals With Alien Populations: Distribution, Causes, and Conservation

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