Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Animal interactions are an integral part of a community’s function, with influences ranging from the spatiotemporal habitat use of species to population effects to ecosystem management. Numerous non-native species are established or maintained through stocking in freshwater ecosystems with the potential to affect restoration of native species. Using acoustic telemetry, this study quantified the spatiotemporal co-occurrence of the native top-predator lake trout (Salvelinus namaycush) with non-native Chinook salmon (Oncorhynchus tshawytscha) in Lake Ontario over 2.5 years. Core home range overlap was observed during the summer, with depth acting as a mechanism of segregation, but with potential for interactions during vertical exploration. Fine-scale individual pairwise interactions confirmed the home range results. No horizontal overlap was observed during the winter and spring, but confidence was lower due to poor instrument coverage in deeper water, which the two species may frequent in these seasons. These results demonstrate the importance of depth in understanding fish interactions and highlight the usefulness of considering pairwise species interactions for understanding ecosystem community function to resource managers with multiple projects involving both native and non-native species.

中文翻译：

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大型湖泊中原生和引入鲑鱼顶级捕食者的时空相互作用：对物种恢复的影响

加拿大渔业和水产科学杂志，提前印刷。
动物互动是社区功能的一个组成部分，其影响范围从物种的时空栖息地使用到种群效应再到生态系统管理。许多非本地物种是通过在淡水生态系统中放养而建立或维持的，这些物种有可能影响本地物种的恢复。本研究使用声学遥测技术量化了安大略湖中本地顶级捕食者湖鳟鱼 (Salvelinus namaycush) 与非本地奇努克鲑鱼 (Oncorhynchus tshawytscha) 在 2.5 年间的时空共存情况。在夏季观察到核心家庭范围重叠，深度作为隔离机制，但在垂直勘探过程中可能会发生相互作用。精细的个体成对相互作用证实了家庭范围的结果。在冬季和春季期间没有观察到水平重叠，但由于仪器覆盖较深的水域较差，因此可信度较低，这两个物种可能在这些季节频繁出现。这些结果证明了深度理解鱼类相互作用的重要性，并强调了考虑成对物种相互作用以了解生态系统群落功能对资源管理者的有用性，这些项目涉及本地和非本地物种的多个项目。