Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland
Spatial trends and comparative changes in time of selected trace elements were studied in liver tissue from polar bears from ten different subpopulation locations in Alaska, Canadian Arctic and East Greenland. For nine of the trace elements (As, Cd, Cu, Hg, Mn, Pb, Rb, Se and Zn) spatial trends were...
Published in: | Journal of Environmental Monitoring |
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2011
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Online Access: | https://pure.au.dk/portal/da/publications/spatial-and-temporal-trends-of-selected-trace-elements-in-liver-tissue-from-polar-bears-ursus-maritimus-from-alaska-canada-and-greenland(d5c83a26-5864-4c48-8c61-34d11338d69f).html https://doi.org/10.1039/c1em10088b |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/d5c83a26-5864-4c48-8c61-34d11338d69f 2023-05-15T15:00:37+02:00 Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland Routti, Heli Letcher, Robert J Born, Erik W Branigan, Marsha Dietz, Rune Evans, Thomas J Fisk, Aaron T Peacock, Elizabeth Sonne, Christian 2011 https://pure.au.dk/portal/da/publications/spatial-and-temporal-trends-of-selected-trace-elements-in-liver-tissue-from-polar-bears-ursus-maritimus-from-alaska-canada-and-greenland(d5c83a26-5864-4c48-8c61-34d11338d69f).html https://doi.org/10.1039/c1em10088b eng eng info:eu-repo/semantics/restrictedAccess Routti , H , Letcher , R J , Born , E W , Branigan , M , Dietz , R , Evans , T J , Fisk , A T , Peacock , E & Sonne , C 2011 , ' Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland ' , Journal of Environmental Monitoring , vol. 13 , pp. 2260-2267 . https://doi.org/10.1039/c1em10088b article 2011 ftuniaarhuspubl https://doi.org/10.1039/c1em10088b 2021-09-29T22:45:58Z Spatial trends and comparative changes in time of selected trace elements were studied in liver tissue from polar bears from ten different subpopulation locations in Alaska, Canadian Arctic and East Greenland. For nine of the trace elements (As, Cd, Cu, Hg, Mn, Pb, Rb, Se and Zn) spatial trends were investigated in 136 specimens sampled during 2005-2008 from bears from these ten subpopulations. Concentrations of Hg, Se and As were highest in the (northern and southern) Beaufort Sea area and lowest in (western and southern) Hudson Bay area and Chukchi/Bering Sea. In contrast, concentrations of Cd showed an increasing trend from east to west. Minor or no spatial trends were observed for Cu, Mn, Rb and Zn. Spatial trends were in agreement with previous studies, possibly explained by natural phenomena. To assess temporal changes of Cd, Hg, Se and Zn concentrations during the last decades, we compared our results to previously published data. These time comparisons suggested recent Hg increase in East Greenland polar bears. This may be related to Hg emissions and/or climate-induced changes in Hg cycles or changes in the polar bear food web related to global warming. Also, Hg : Se molar ratio has increased in East Greenland polar bears, which suggests there may be an increased risk for Hg(2+)-mediated toxicity. Since the underlying reasons for spatial trends or changes in time of trace elements in the Arctic are still largely unknown, future studies should focus on the role of changing climate and trace metal emissions on geographical and temporal trends of trace elements. Article in Journal/Newspaper Arctic Beaufort Sea Bering Sea Chukchi East Greenland Global warming Greenland Hudson Bay Ursus maritimus Alaska Aarhus University: Research Arctic Bering Sea Canada Greenland Hudson Hudson Bay Journal of Environmental Monitoring 13 8 2260 |
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Open Polar |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
Spatial trends and comparative changes in time of selected trace elements were studied in liver tissue from polar bears from ten different subpopulation locations in Alaska, Canadian Arctic and East Greenland. For nine of the trace elements (As, Cd, Cu, Hg, Mn, Pb, Rb, Se and Zn) spatial trends were investigated in 136 specimens sampled during 2005-2008 from bears from these ten subpopulations. Concentrations of Hg, Se and As were highest in the (northern and southern) Beaufort Sea area and lowest in (western and southern) Hudson Bay area and Chukchi/Bering Sea. In contrast, concentrations of Cd showed an increasing trend from east to west. Minor or no spatial trends were observed for Cu, Mn, Rb and Zn. Spatial trends were in agreement with previous studies, possibly explained by natural phenomena. To assess temporal changes of Cd, Hg, Se and Zn concentrations during the last decades, we compared our results to previously published data. These time comparisons suggested recent Hg increase in East Greenland polar bears. This may be related to Hg emissions and/or climate-induced changes in Hg cycles or changes in the polar bear food web related to global warming. Also, Hg : Se molar ratio has increased in East Greenland polar bears, which suggests there may be an increased risk for Hg(2+)-mediated toxicity. Since the underlying reasons for spatial trends or changes in time of trace elements in the Arctic are still largely unknown, future studies should focus on the role of changing climate and trace metal emissions on geographical and temporal trends of trace elements. |
format |
Article in Journal/Newspaper |
author |
Routti, Heli Letcher, Robert J Born, Erik W Branigan, Marsha Dietz, Rune Evans, Thomas J Fisk, Aaron T Peacock, Elizabeth Sonne, Christian |
spellingShingle |
Routti, Heli Letcher, Robert J Born, Erik W Branigan, Marsha Dietz, Rune Evans, Thomas J Fisk, Aaron T Peacock, Elizabeth Sonne, Christian Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland |
author_facet |
Routti, Heli Letcher, Robert J Born, Erik W Branigan, Marsha Dietz, Rune Evans, Thomas J Fisk, Aaron T Peacock, Elizabeth Sonne, Christian |
author_sort |
Routti, Heli |
title |
Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland |
title_short |
Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland |
title_full |
Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland |
title_fullStr |
Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland |
title_full_unstemmed |
Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland |
title_sort |
spatial and temporal trends of selected trace elements in liver tissue from polar bears (ursus maritimus) from alaska, canada and greenland |
publishDate |
2011 |
url |
https://pure.au.dk/portal/da/publications/spatial-and-temporal-trends-of-selected-trace-elements-in-liver-tissue-from-polar-bears-ursus-maritimus-from-alaska-canada-and-greenland(d5c83a26-5864-4c48-8c61-34d11338d69f).html https://doi.org/10.1039/c1em10088b |
geographic |
Arctic Bering Sea Canada Greenland Hudson Hudson Bay |
geographic_facet |
Arctic Bering Sea Canada Greenland Hudson Hudson Bay |
genre |
Arctic Beaufort Sea Bering Sea Chukchi East Greenland Global warming Greenland Hudson Bay Ursus maritimus Alaska |
genre_facet |
Arctic Beaufort Sea Bering Sea Chukchi East Greenland Global warming Greenland Hudson Bay Ursus maritimus Alaska |
op_source |
Routti , H , Letcher , R J , Born , E W , Branigan , M , Dietz , R , Evans , T J , Fisk , A T , Peacock , E & Sonne , C 2011 , ' Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland ' , Journal of Environmental Monitoring , vol. 13 , pp. 2260-2267 . https://doi.org/10.1039/c1em10088b |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1039/c1em10088b |
container_title |
Journal of Environmental Monitoring |
container_volume |
13 |
container_issue |
8 |
container_start_page |
2260 |
_version_ |
1766332692958281728 |