Streaming Media
Presentation Abstract
Characterization and Interpolation of Sediment PCBs and PBDEs in Resident Killer Whale Habitat along the Coast of The northeastern Pacific Northern and Southern Resident Killer Whale (NRKW and SRKW) (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 (LogKow; p < 0.003). Sediment particle size (SPS), 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 (BCMoE) Working Sediment Quality Guidelines (WSQGs) (PCBs: 3.7 pg/g dw and PBDEs: 1,000 pg/g dw), considered protective of killer whales. Our findings suggest that the legacy of banned PCBs and PBDEs is likely to constrain the recovery of killer whales as a result of their mobilization from sediments and consequent uptake by marine food webs.
Session Title
Poster Session 4: People Working Together to Protect the Salish Sea
Conference Track
SSE14: Posters
Conference Name
Salish Sea Ecosystem Conference (2022 : Online)
Document Type
Event
SSEC Identifier
SSE-posters-22
Start Date
27-4-2022 4:30 PM
End Date
27-4-2022 5:00 PM
Type of Presentation
Poster
Genre/Form
conference proceedings; presentations (communicative events)
Contributing Repository
Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.
Subjects – Topical (LCSH)
Polychlorinated biphenyls; Polybrominated diphenyl ethers; Marine sediments--Salish Sea (B.C. and Wash.); Killer whale--Salish Sea (B.C. and Wash.); Endangered species--Salish Sea (B.C. and Wash.); Wildlife conservation--Salish Sea (B.C. and Wash.)
Geographic Coverage
Salish Sea (B.C. and Wash.)
Rights
Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Type
Text
Language
English
Format
application/pdf
Included in
Marine Biology Commons, Natural Resources and Conservation Commons, Terrestrial and Aquatic Ecology Commons
Characterization and Interpolation of Sediment PCBs and PBDEs in Resident Killer Whale Habitat along the Coast of British Columbia, Canada
Characterization and Interpolation of Sediment PCBs and PBDEs in Resident Killer Whale Habitat along the Coast of The northeastern Pacific Northern and Southern Resident Killer Whale (NRKW and SRKW) (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 (LogKow; p < 0.003). Sediment particle size (SPS), 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 (BCMoE) Working Sediment Quality Guidelines (WSQGs) (PCBs: 3.7 pg/g dw and PBDEs: 1,000 pg/g dw), considered protective of killer whales. Our findings suggest that the legacy of banned PCBs and PBDEs is likely to constrain the recovery of killer whales as a result of their mobilization from sediments and consequent uptake by marine food webs.
