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Trends of persistent organic pollutants in ringed seals (Phoca hispida) from the Canadian Arctic.
Sci Total Environ. 2019 May 15; 665:1135-1146.ST

Abstract

Ringed seals (Phoca hispida) have been used as bioindicator species of environmental contamination in Canada since the 1970s. In the present study, seals were harvested during subsistence hunts in four regions of the Canadian Arctic: Beaufort Sea, Arctic Archipelago, Hudson Bay, and coastal Labrador. An extensive suite of persistent organic pollutants (POPs) was determined in seal blubber collected for multiple years between 1972 and 2016. Results from this long-term study indicate geographical differences in the contaminant concentrations in seals and the significant general decrease of most POPs, including polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and related compounds, chlordanes (CHL), and hexachlorocyclohexanes (HCH) over time in ringed seals. The highest decrease rates (up to -9.1%/year for α-HCH) were found in seals from the Hudson Bay region where all chemicals investigated have significantly decreased since 1986. Significant increases in concentrations of hexachlorobenzene (HCB) in seals from Labrador and β-HCH in Sachs Harbour, NT and Arctic Archipelago were observed. Site-specific and contaminant-specific associations between climate pattern (i.e., Arctic Oscillation, North Atlantic Oscillation, and Pacific/North American pattern) and mean ice-coverage (total, first-year ice, and old-ice) were found at sites with the longest time trend data (i.e., Arviat, Sachs Harbour/Ulukhaktok and Resolute Bay). Overall, results suggest that North American and international regulations have led to the long-term reduction of most POPs in Canadian Arctic ringed seals by reducing emissions from primary sources. However, other sources of legacy compounds (e.g., environmental reservoirs) as well changes in food web composition and structure in relation to climate changes could also be influencing the very slow rates of decline, or stable levels, of contaminants found in seals at some sites. Further work is warranted to discern between co-variation of climate changes and contaminant concentrations and cause-and-effect relationships.

Authors+Show Affiliations

Environment and Climate Change Canada, 105 McGill Street, Montreal, QC H2Y 2E7, Canada. Electronic address: magali.houde@canada.ca.Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, ON L7S 1A1, Canada.Environment and Climate Change Canada, 105 McGill Street, Montreal, QC H2Y 2E7, Canada.Environment and Climate Change Canada, 105 McGill Street, Montreal, QC H2Y 2E7, Canada.Fisheries and Oceans Canada, Arctic Aquatic Research Division, Winnipeg, MB R3T 2N6, Canada.Fisheries and Oceans Canada, Institute of Ocean Sciences, Sidney, BC V8L 4B2, Canada.Fisheries and Oceans Canada, Institute of Ocean Sciences, Sidney, BC V8L 4B2, Canada.1705 Eagle View Place, Duncan, BC V9L 6R1, Canada.Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, ON L7S 1A1, Canada.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30893745

Citation

Houde, M, et al. "Trends of Persistent Organic Pollutants in Ringed Seals (Phoca Hispida) From the Canadian Arctic." The Science of the Total Environment, vol. 665, 2019, pp. 1135-1146.
Houde M, Wang X, Colson TL, et al. Trends of persistent organic pollutants in ringed seals (Phoca hispida) from the Canadian Arctic. Sci Total Environ. 2019;665:1135-1146.
Houde, M., Wang, X., Colson, T. L., Gagnon, P., Ferguson, S. H., Ikonomou, M. G., Dubetz, C., Addison, R. F., & Muir, D. C. G. (2019). Trends of persistent organic pollutants in ringed seals (Phoca hispida) from the Canadian Arctic. The Science of the Total Environment, 665, 1135-1146. https://doi.org/10.1016/j.scitotenv.2019.02.138
Houde M, et al. Trends of Persistent Organic Pollutants in Ringed Seals (Phoca Hispida) From the Canadian Arctic. Sci Total Environ. 2019 May 15;665:1135-1146. PubMed PMID: 30893745.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Trends of persistent organic pollutants in ringed seals (Phoca hispida) from the Canadian Arctic. AU - Houde,M, AU - Wang,X, AU - Colson,T-L L, AU - Gagnon,P, AU - Ferguson,S H, AU - Ikonomou,M G, AU - Dubetz,C, AU - Addison,R F, AU - Muir,D C G, Y1 - 2019/02/11/ PY - 2018/12/20/received PY - 2019/02/07/revised PY - 2019/02/08/accepted PY - 2019/3/22/entrez PY - 2019/3/22/pubmed PY - 2019/4/17/medline KW - Climate change KW - Legacy contaminants KW - Pinnipeds KW - Spatial distribution KW - Temporal trends SP - 1135 EP - 1146 JF - The Science of the total environment JO - Sci. Total Environ. VL - 665 N2 - Ringed seals (Phoca hispida) have been used as bioindicator species of environmental contamination in Canada since the 1970s. In the present study, seals were harvested during subsistence hunts in four regions of the Canadian Arctic: Beaufort Sea, Arctic Archipelago, Hudson Bay, and coastal Labrador. An extensive suite of persistent organic pollutants (POPs) was determined in seal blubber collected for multiple years between 1972 and 2016. Results from this long-term study indicate geographical differences in the contaminant concentrations in seals and the significant general decrease of most POPs, including polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and related compounds, chlordanes (CHL), and hexachlorocyclohexanes (HCH) over time in ringed seals. The highest decrease rates (up to -9.1%/year for α-HCH) were found in seals from the Hudson Bay region where all chemicals investigated have significantly decreased since 1986. Significant increases in concentrations of hexachlorobenzene (HCB) in seals from Labrador and β-HCH in Sachs Harbour, NT and Arctic Archipelago were observed. Site-specific and contaminant-specific associations between climate pattern (i.e., Arctic Oscillation, North Atlantic Oscillation, and Pacific/North American pattern) and mean ice-coverage (total, first-year ice, and old-ice) were found at sites with the longest time trend data (i.e., Arviat, Sachs Harbour/Ulukhaktok and Resolute Bay). Overall, results suggest that North American and international regulations have led to the long-term reduction of most POPs in Canadian Arctic ringed seals by reducing emissions from primary sources. However, other sources of legacy compounds (e.g., environmental reservoirs) as well changes in food web composition and structure in relation to climate changes could also be influencing the very slow rates of decline, or stable levels, of contaminants found in seals at some sites. Further work is warranted to discern between co-variation of climate changes and contaminant concentrations and cause-and-effect relationships. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/30893745/Trends_of_persistent_organic_pollutants_in_ringed_seals__Phoca_hispida__from_the_Canadian_Arctic_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(19)30626-6 DB - PRIME DP - Unbound Medicine ER -