Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Competition from non-native salmonids is potentially impairing efforts to restore Atlantic salmon (Salmo salar) to parts of their historical range. In three separate meta-analyses, we collected 104 effect sizes from 25 published papers to quantify the effect of both native and non-native salmonids on the performance (i.e., behaviour, habitat use, growth and survival) of Atlantic salmon. The presence of other species had negative effects on the performance of Atlantic salmon; in particular, non-native species and brown trout (Salmo trutta), whether native or non-native, had the most negative effects. Contrary to our predictions, the negative effects of other species were not exacerbated in laboratory compared to field studies and did not increase with total salmonid abundance or the relative body size of the competitors. However, most studies in our analyses were conducted under laboratory conditions and at densities much higher than found in nature. Thus, a realistic assessment of the potential success of restoration programs when interspecific competitors are present should include more studies conducted under natural conditions.

中文翻译：

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种间竞争降低了大西洋鲑鱼（Salmo salar）的性能：对恢复计划的影响

加拿大渔业和水生科学杂志，印刷前。
来自非本地鲑鱼的竞争可能会损害将大西洋鲑（Salmo salar）恢复到其历史范围的一部分的努力。在三项独立的荟萃分析中，我们从 25 篇已发表论文中收集了 104 个效应量，以量化本地和非本地鲑鱼对大西洋鲑鱼性能（即行为、栖息地利用、生长和生存）的影响。其他物种的存在对大西洋鲑鱼的表现有负面影响；特别是，非本地物种和褐鳟 (Salmo trutta)，无论是本地的还是非本地的，都具有最大的负面影响。与我们的预测相反，与现场研究相比，其他物种的负面影响在实验室中并未加剧，并且并未随着鲑鱼总丰度或竞争对手的相对体型而增加。然而，我们分析中的大多数研究都是在实验室条件下进行的，密度远高于自然界中的密度。因此，当存在种间竞争者时，对恢复计划潜在成功的现实评估应该包括在自然条件下进行的更多研究。