The Lake Huron ecosystem is unique among the Laurentian Great Lakes (USA/Canada) in that its surface area encompasses 3 distinct basins. This ecosystem recently experienced significant ecological restructuring characterized by changes in primary production, species dominance and abundances, and top predator energy dynamics. However, much of the evidence for this restructuring has been largely derived from biomonitoring data obtained from long‐term sampling of the lake's Main Basin. We examined polychlorinated biphenyl (PCB) concentrations and the stable isotopes of carbon (δ¹³C) and nitrogen (δ¹⁵N) in rainbow smelt (Osmerus mordax), bloater (Coregonus hoyi), and round goby (Neogobius melanostomus) to determine spatial variability in these environmental markers as indicators of the ubiquity of trophic restructuring throughout Lake Huron. Stable isotopes indicated that North Channel fish occupied trophic positions between 0.5 and 1.0 lower relative to Main Basin and Georgian Bay conspecifics, respectively. Sum PCB concentrations for 41 congeners were highest for fish from the Main Basin (27.5 ± 3.0 ng g⁻¹ wet wt) and Georgian Bay (26.3 ± 3.4 ng g⁻¹ wet wt) relative to North Channel (13.6 ± 1.2 ng g⁻¹ wet wt) fish. Discriminant functions analysis demonstrated basin‐specific PCB congener profiles with individual species also having distinct profiles dependent on their basin of collection. These bioaccumulation patterns among Lake Huron forage fish mirror those reported for lake trout in this lake and indicate that the degree of food‐web ecological restructuring in Lake Huron is not equivalent across the basins. Specifically, basin‐specific PCB congener profiles demonstrated that differences among Lake Huron secondary and top predator consumer species are likely dictated by cross‐basin differences in zooplankton community ecology and trophodynamics that can regulate the efficiencies of prey energy transfer and PCB congener bioaccumulation patterns in aquatic food webs. Environ Toxicol Chem 2020;39:1712–1723. © 2020 SETAC

中文翻译：

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盆地特定的污染物生物富集模式定义了休伦湖饲草鱼。

休伦湖生态系统在Laurentian大湖区（美国/加拿大）中是独一无二的，因为其表面积包括3个不同的盆地。这个生态系统最近经历了重大的生态结构调整，其特征在于初级生产，物种优势和丰度的变化以及主要捕食者的能源动态。但是，这种结构调整的许多证据主要来自对湖泊主盆地进行长期采样获得的生物监测数据。我们检查了多氯联苯（PCB）的浓度和碳（δ的稳定同位素¹³ C）和氮（δ ¹⁵在彩虹胡瓜N）（Osmerus mordax），熏鱼（霍氏白鲑），和圆形虾虎鱼（Neogobius melanostomus）以确定这些环境标志物的空间变异性，作为整个休伦湖营养重组的普遍指标。稳定的同位素表明，相对于主盆地和格鲁吉亚湾的物种，北槽鱼的营养位置分别降低了0.5至1.0。总和PCB浓度为41个同源物是从主盆地最高为鱼（27.5±3.0纳克克^-1湿重）和乔治亚湾（26.3±3.4纳克克^-1湿重）相对于北通道（13.6±1.2纳克克^{- 1个}湿重）鱼。判别函数分析显示了特定于盆地的PCB同系物分布图，单个物种也根据其收集盆地而具有不同的分布图。休伦湖饲草鱼的这些生物富集模式与该湖中鳟鱼的生物富集模式相吻合，表明休伦湖食物网生态结构调整的程度在整个流域均不相同。具体而言，流域特有的PCB同类动物分布图表明，休伦湖次生和顶级捕食者消费物种之间的差异可能是由跨流域的浮游动物群落生态学和营养动力学差异决定的，这些差异可调节水生生物中猎物能量转移和PCB同类生物积累模式的效率。食物网。环境毒性化学2020; 39：1712–1723。©2020 SETAC