在加拿大,东北太平洋北部和南部的居民虎鲸(Orcinusorca)种群被列为受威胁和濒危物种,分别,坚持不懈,生物蓄积性污染物,如多氯联苯(PCBs)和多溴二苯醚(PBDEs),对他们的康复构成威胁。从不列颠哥伦比亚省(BC)海岸的97个地点收集的潮下表层沉积物中的多氯联苯和多溴二苯醚的浓度用于确定其分布和剖面,并评估虎鲸栖息地质量。维多利亚港(VH3(场地编号:1))沉积物显示出最高的多氯联苯和多溴二苯醚浓度。对于PCB,PCB-138浓度最高,其次是PCB-153、PCB-110、PCB-149、PCB-101和PCB-118。对于多溴二苯醚,个体同源物排序如下:BDE-209>BDE-207>BDE-206>BDE-208>BDE-47>BDE-99。主成分分析(PCA)说明了污染物分布的变化,多氯联苯和多溴二苯醚的PC1与辛醇-水分配系数相关(logKOW,p<0.003)。基于PCA,沉积物粒径,总有机碳(TOC)和收集时的水深是与多溴二苯醚分布相关的其他因素,而PCB剖面与TOC相关。100%和34%的地点的PCB和PBDE总浓度,分别,超过了最近通过的不列颠哥伦比亚省环境与气候变化战略部的工作沉积物质量指南(PCBs3.7pg/g干重和PBDEs1000pg/g干重),被认为是对虎鲸的保护。我们的发现表明,由于被禁止的多氯联苯和多溴二苯醚从沉积物中动员并因此被海洋食物网吸收,因此有可能限制虎鲸的恢复。环境毒物化学2022;41:2139-2151。©2022SETAC。
The northeastern Pacific northern and southern resident killer whale (Orcinus orca) populations are listed as threatened and endangered in Canada, respectively, with persistent, bioaccumulative contaminants, such as polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs), posing threats to their recovery. Concentrations of PCBs and PBDEs in subtidal surface sediments collected from 97 sites along the British Columbia (BC) coast were used to identify their distribution and profiles, and to assess killer whale habitat quality. Victoria Harbour (VH3(site ID: 1) ) sediments exhibited the highest PCB and PBDE concentrations. For PCBs, PCB-138 was found at the highest concentration, followed by PCB-153, PCB-110, PCB-149, PCB-101, and PCB-118. For PBDEs, individual congeners were ranked as follows: BDE-209 > BDE-207 > BDE-206 > BDE-208 > BDE-47 > BDE-99. Principal component analyses (PCA) illustrated the variations in contaminant profiles, with PC1 for PCBs and PBDEs correlated with the octanol-water partition coefficient (log KOW , p < 0.003). Based on the PCA, sediment particle size, total organic carbon (TOC), and water depth at collection were other factors associated with the distribution of PBDEs, while PCB profiles were associated with TOC. Total PCB and PBDE concentrations at 100% and 34% of the sites, respectively, exceeded the recently adopted British Columbia\'s Ministry of Environment and Climate Change Strategy Working Sediment Quality Guidelines (PCBs 3.7 pg/g dry wt and PBDEs 1000 pg/g dry wt), considered protective of killer whales. Our findings suggest that the legacy of banned PCBs and PBDEs has the potential to constrain the recovery of killer whales as a result of their mobilization from sediments and consequent uptake by marine food webs. Environ Toxicol Chem 2022;41:2139-2151. © 2022 SETAC.