Alewife (Alosa pseudoharengus) are the preferred prey species of the top piscivore predators in the Lake Ontario food web and are an essential constituent in the bioaccumulation of persistent organic contaminants. Year-class samples collected in 2016 represent the alewife age ranges of 2015 (Age-01) sequentially dating back to 2008 (Age-08). The most abundant contaminant measured in Lake Ontario alewife (151.5 ng/g) were total polychlorinated biphenyls (PCBs), increasing at a rate of 11.8 ng/g per year on an age-averaged concentration basis. Total mercury demonstrated the largest percent increase (240%) accumulated over alewife ages of 1–8 years. Average total concentrations of the most abundant polychlorinated dibenzo-p-dioxin isomer (2378-tetrachlorinated dibenzo-p-dioxin (TCDD), 1.3 pg/g) and polychlorinated dibenzofuran isomer (2378-tetrachlorinated dibenzofuran (2378-TCDF), 6.6 pg/g) comprised most of the overall total dioxin (2.5 pg/g) and total furan concentrations (8.7 pg/g). The vast majority (69%) of alewife total toxic equivalence (TEQ) was comprised of the non-ortho coplanar PCBs. Both mammal and avian wildlife protection values based on total TEQ were uniformly exceeded for the dioxin-like compounds measured in Lake Ontario alewife. Ontogenetic dietary influences expressed a significant impact on Age-01 alewife age-contaminant relationships and age-stable isotope concentrations and trends for legacy contaminants. Total Hg and all dioxin-like contaminants did not demonstrate the Age-01 ontogenetic dietary effects found in legacy contaminants. A prominent polychlorinated naphthalene (PCN) concentration peak measured in year-class Age-04 alewife was followed by a corresponding lake trout peak 3–4 years later illustrating a unique example of trophic-level contaminant uptake and concomitant integration delay.

Alewife ( Alosa pseudoharengus) 是安大略湖食物网中顶级食肉动物捕食者的首选猎物物种，并且是持久性有机污染物生物积累的重要组成部分。2016 年收集的年级样本代表 2015 年（01 岁）的年龄范围，依次追溯到 2008 年（08 岁）。在安大略湖 alewife 中测得的最丰富的污染物 (151.5 ng/g) 是总多氯联苯 (PCB)，按年龄平均浓度计算，以每年 11.8 ng/g 的速度增加。总汞显示出最大的百分比增长 (240%) 在 1-8 岁的 alewife 年龄累积。最丰富的多氯二苯并对二恶英异构体（2378-四氯化二苯并对二恶英 (TCDD)，1. 3 pg/g) 和多氯二苯并呋喃异构体（2378-四氯化二苯并呋喃 (2378-TCDF)，6.6 pg/g）占总二恶英 (2.5 pg/g) 和总呋喃浓度 (8.7 pg/g) 的大部分。alewife 总毒性当量 (TEQ) 的绝大多数 (69%) 由非正交共面 PCB 组成。在安大略湖 alewife 中测量的二恶英类化合物均超过了基于总 TEQ 的哺乳动物和鸟类野生动物保护值。个体发生的饮食影响对 Age-01 alewife 年龄-污染物关系和年龄稳定同位素浓度和遗留污染物的趋势有显着影响。总汞和所有二恶英类污染物并未表现出在遗留污染物中发现的 Age-01 个体发育饮食效应。