1. Predators can shape the distributions and dynamics of their prey through direct and indirect mechanisms. Where prey animals are regarded as pests, the augmentation of predator populations might offer a potential tool in their management.
2. Declines in invasive non‐native grey squirrel Sciurus carolinensis populations in Ireland and Scotland have been related to an increase in range and density of native pine marten Martes martes populations. These reductions in grey squirrel abundance have, in turn, been linked to recovery of native red squirrels Sciurus vulgaris.
3. Taking the opportunity presented by a conservation translocation of pine martens from Scotland to Wales, we investigated the short‐term effects of exposure to translocated martens on the space use and survival of resident grey squirrels.
4. Grey squirrel range size and daily distance travelled increased significantly with increasing exposure to martens but we found no effect of marten exposure on the recapture probability (i.e. apparent survival) of the sampled squirrels within the study time frame. This is suggestive of contemporary, non‐lethal effects changing the ranging or foraging regimes of squirrels, due either to predator avoidance and/or earlier lethal effects associated with a reduction in intraspecific competition.
5. Synthesis and applications. Our evaluation mimics the conditions experienced by grey squirrels at the front edge of naturally recovering pine marten populations and presents direct evidence that pine marten translocations could play an influential role in the behaviour and dynamics of invasive non‐native grey squirrel populations. Translocations of native predators, undertaken primarily for biodiversity conservation, could therefore find additional application in managing the ecological and economic impacts of invasive non‐native prey.

中文翻译：

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易位的当地松树貂Martes martes通过侵入性非本地灰松鼠Sciurus carolinensis改变短期空间利用

1. 捕食者可以通过直接和间接机制来改变猎物的分布和动态。当捕食动物被视为害虫时，捕食者数量的增加可能会提供一种潜在的管理工具。
2. 在侵入性非天然灰松鼠下降松鼠蜥在爱尔兰和苏格兰群体已涉及到的增加范围和天然松貂的密度貂貂种群。这些灰松鼠数量的减少又与本地红松鼠寻常松鼠的恢复有关。
3. 利用从苏格兰到威尔士的松树貂保护性转移带来的机会，我们研究了暴露于转移性貂的短期影响对居住的灰松鼠的空间利用和生存。
4. 灰鼠的范围大小和行进的每日距离随着对貂的接触而增加，但是我们发现，在研究时间范围内，貂的接触对采样的松鼠的捕获概率（即表观存活率）没有影响。这表明由于避免捕食者和/或与种内竞争减少相关的较早的致死作用，当代的非致死作用改变了松鼠的放牧范围或觅食方式。
5. 综合与应用。我们的评估模拟了自然恢复的松貂种群前端的灰松鼠所经历的条件，并提供了直接证据表明松貂易位可在非本地入侵的灰松鼠种群的行为和动力学中发挥重要作用。因此，主要是为了保护生物多样性而进行的本地掠食者易位，可以在管理侵入性非本地猎物的生态和经济影响方面找到更多的应用。