Abstract Understanding stock structure and habitat use is important for sustainable fisheries management and conservation of genetic and phenotypic diversity. In eastern Lake Michigan, yellow perch Perca flavescens is found in both the nearshore region of Lake Michigan proper and drowned river mouth (DRM) lakes, small estuary-like systems directly connected to Lake Michigan. Recent genetic analyses suggest complex stock structure between these habitats and the potential migration of Lake Michigan yellow perch into the profundal zone of DRM lakes. We quantified carbon (δ13C) and oxygen (δ18O) stable isotope ratios of yellow perch otolith cores to index natal origins, and measured muscle δ13C, nitrogen (δ15N), δ18O, and hydrogen (δ2H) isotope ratios to reflect recent diet and habitat use. Stable isotope ratios of otolith cores and muscle samples support the existence of resident populations in nearshore Lake Michigan and DRM lakes, as well as Lake Michigan migrants using DRM lakes. Most fish caught in DRM lakes that had natal and recent stable isotope values similar to Lake Michigan fish were collected during fall in DRM lake profundal zones. Comparison of otolith core and muscle stable isotope ratios of individual yellow perch suggest that individuals that recently migrated to DRM lakes also spent early life in Lake Michigan. Differential habitat use patterns of yellow perch in eastern Lake Michigan may have important implications for harvest estimates and fishing regulations. Migration by Lake Michigan fish into DRM lakes does not appear to be related to reproduction, and the underlying benefits of these migrations remain unclear.

中文翻译：

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密歇根湖东部和相连的淹没河口湖泊黄鲈的差异栖息地利用模式

摘要 了解种群结构和栖息地利用对于可持续渔业管理和遗传和表型多样性的保护非常重要。在密歇根湖东部，在密歇根湖的近岸区域和淹没河口 (DRM) 湖泊中都发现了黄鲈 Perca flavescens，这些湖泊是与密歇根湖直接相连的小型河口系统。最近的遗传分析表明，这些栖息地之间存在复杂的种群结构，以及密歇根湖黄鲈可能迁移到 DRM 湖泊的深层区域。我们量化了黄鲈耳石核心的碳 (δ13C) 和氧 (δ18O) 稳定同位素比率以指示出生起源，并测量肌肉 δ13C、氮 (δ15N)、δ18O 和氢 (δ2H) 同位素比率以反映最近的饮食和栖息地使用. 耳石核和肌肉样本的稳定同位素比率支持近岸密歇根湖和 DRM 湖泊中常住人口的存在，以及使用 DRM 湖泊的密歇根湖移民。在 DRM 湖中捕获的大多数鱼类的出生和最近的稳定同位素值与密歇根湖鱼相似，都是在秋季在 DRM 湖深区收集的。个体黄鲈的耳石核和肌肉稳定同位素比率的比较表明，最近迁移到 DRM 湖泊的个体也在密歇根湖度过了早期生活。密歇根湖东部黄鲈的不同栖息地使用模式可能对收获估算和捕捞法规产生重要影响。密歇根湖鱼类迁移到 DRM 湖泊似乎与繁殖无关，