International political boundaries challenge species conservation because they can hinder coordinated management. Peripheral transboundary species, those with a large portion of their range in one country and a small, peripheral portion in an adjacent country, may be particularly vulnerable to mismatches in management because peripheral populations are likely in greater conservation need than core populations. However, no systematic assessment of peripheral transboundary species or their status across borders has been attempted. We show that numerous species in three vertebrate taxa qualify as peripheral transboundary species in North America, and that these species are often protected differently across US–Canadian and US–Mexican borders. Asymmetries in cross‐border protection may threaten populations through disruption of connectivity between periphery and core regions and are especially relevant given expected impacts of climate change and the US–Mexico border wall. Our results highlight the need for greater international collaboration in management and planning decisions for transboundary species.

中文翻译：

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周边跨界物种的不对称跨境保护

国际政治边界对物种保护提出了挑战，因为它们会阻碍协调管理。外围跨界物种，在一个国家中占很大比例，而在邻国中占很小的外围比例，可能特别容易受到管理失配的影响，因为外围种群比核心种群更需要保护。但是，尚未尝试对外围越境物种或其跨境状况进行系统评估。我们表明，在北美，三个脊椎动物分类单元中的许多物种都可以作为周边的跨界物种，而且这些物种在美国-加拿大和美国-墨西哥边界之间通常受到不同的保护。跨界保护的不对称性可能会通过破坏周边地区和核心地区之间的连通性而威胁到人口，考虑到气候变化和美墨边界墙的预期影响，这一点尤其重要。我们的结果表明，需要在跨界物种的管理和规划决策方面加强国际合作。