Mercury methylation and demethylation potentials in Arctic lake sediments
Mercury (Hg) transformations in sediments are key factors in the Hg exposure pathway for wildlife and humans yet are poorly characterized in Arctic lakes. As the Arctic is rapidly warming, it is important to understand how the rates of Hg methylation and demethylation (wich determine Hg bioavailabil...
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Online Access: | https://scholar.uwindsor.ca/glierpub/288 https://doi.org/10.1016/j.chemosphere.2020.126001 |
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ftunivwindsor:oai:scholar.uwindsor.ca:glierpub-1290 2023-06-11T04:08:12+02:00 Mercury methylation and demethylation potentials in Arctic lake sediments Hudelson, Karista E. Drevnick, Paul E. Wang, Feiyue Armstrong, Deborah Fisk, Aaron T. 2020-06-01T07:00:00Z https://scholar.uwindsor.ca/glierpub/288 https://doi.org/10.1016/j.chemosphere.2020.126001 unknown Scholarship at UWindsor https://scholar.uwindsor.ca/glierpub/288 doi:10.1016/j.chemosphere.2020.126001 https://doi.org/10.1016/j.chemosphere.2020.126001 Great Lakes Institute for Environmental Research Publications Arctic warming Biogeochemistry Isotope amendment Lacustrine sediments Mercury methylation text 2020 ftunivwindsor https://doi.org/10.1016/j.chemosphere.2020.126001 2023-05-06T19:10:44Z Mercury (Hg) transformations in sediments are key factors in the Hg exposure pathway for wildlife and humans yet are poorly characterized in Arctic lakes. As the Arctic is rapidly warming, it is important to understand how the rates of Hg methylation and demethylation (wich determine Hg bioavailability) change with temperature in lake sediments. Methylation and demethylation potentials were determined for littoral sediments (2.5 m water depth) in two deep and two shallow lakes in the Canadian Arctic using Hg stable isotope tracers at incubation temperatures of 4, 8, or 16 °C for 24 h. Compared to sediments from other regions, Hg methylation and demethylation potentials in these sediments are low. The maximum depth of the lake from which sediment was collected exerted a stronger influence over methylation potential than sediment Hg concentration or organic matter content; the shallowest lake had the highest Hg methylation potential. Sediments from the shallowest lake also demonstrated the greatest response to the temperature treatments, with significantly higher methylation potentials in the 8 and 16 °C treatments. Sediments from the deep lakes demonstrated greater demethylation potentials than shallow lakes. The methylmercury to total Hg ratio in sediments supported the measured transformation potentials as the lake with the greatest methylation potential had the highest ratio. This study supports previous works indicating that Hg methylation potential may increase as the Arctic warms, but demethylation potential does not respond to warming to the same degree, indicating that Hg methylation may predominate in warming Arctic sediments. Text Arctic University of Windsor, Ontario: Scholarship at UWindsor Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Chemosphere 248 126001 |
institution |
Open Polar |
collection |
University of Windsor, Ontario: Scholarship at UWindsor |
op_collection_id |
ftunivwindsor |
language |
unknown |
topic |
Arctic warming Biogeochemistry Isotope amendment Lacustrine sediments Mercury methylation |
spellingShingle |
Arctic warming Biogeochemistry Isotope amendment Lacustrine sediments Mercury methylation Hudelson, Karista E. Drevnick, Paul E. Wang, Feiyue Armstrong, Deborah Fisk, Aaron T. Mercury methylation and demethylation potentials in Arctic lake sediments |
topic_facet |
Arctic warming Biogeochemistry Isotope amendment Lacustrine sediments Mercury methylation |
description |
Mercury (Hg) transformations in sediments are key factors in the Hg exposure pathway for wildlife and humans yet are poorly characterized in Arctic lakes. As the Arctic is rapidly warming, it is important to understand how the rates of Hg methylation and demethylation (wich determine Hg bioavailability) change with temperature in lake sediments. Methylation and demethylation potentials were determined for littoral sediments (2.5 m water depth) in two deep and two shallow lakes in the Canadian Arctic using Hg stable isotope tracers at incubation temperatures of 4, 8, or 16 °C for 24 h. Compared to sediments from other regions, Hg methylation and demethylation potentials in these sediments are low. The maximum depth of the lake from which sediment was collected exerted a stronger influence over methylation potential than sediment Hg concentration or organic matter content; the shallowest lake had the highest Hg methylation potential. Sediments from the shallowest lake also demonstrated the greatest response to the temperature treatments, with significantly higher methylation potentials in the 8 and 16 °C treatments. Sediments from the deep lakes demonstrated greater demethylation potentials than shallow lakes. The methylmercury to total Hg ratio in sediments supported the measured transformation potentials as the lake with the greatest methylation potential had the highest ratio. This study supports previous works indicating that Hg methylation potential may increase as the Arctic warms, but demethylation potential does not respond to warming to the same degree, indicating that Hg methylation may predominate in warming Arctic sediments. |
format |
Text |
author |
Hudelson, Karista E. Drevnick, Paul E. Wang, Feiyue Armstrong, Deborah Fisk, Aaron T. |
author_facet |
Hudelson, Karista E. Drevnick, Paul E. Wang, Feiyue Armstrong, Deborah Fisk, Aaron T. |
author_sort |
Hudelson, Karista E. |
title |
Mercury methylation and demethylation potentials in Arctic lake sediments |
title_short |
Mercury methylation and demethylation potentials in Arctic lake sediments |
title_full |
Mercury methylation and demethylation potentials in Arctic lake sediments |
title_fullStr |
Mercury methylation and demethylation potentials in Arctic lake sediments |
title_full_unstemmed |
Mercury methylation and demethylation potentials in Arctic lake sediments |
title_sort |
mercury methylation and demethylation potentials in arctic lake sediments |
publisher |
Scholarship at UWindsor |
publishDate |
2020 |
url |
https://scholar.uwindsor.ca/glierpub/288 https://doi.org/10.1016/j.chemosphere.2020.126001 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake |
geographic_facet |
Arctic Arctic Lake |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Great Lakes Institute for Environmental Research Publications |
op_relation |
https://scholar.uwindsor.ca/glierpub/288 doi:10.1016/j.chemosphere.2020.126001 https://doi.org/10.1016/j.chemosphere.2020.126001 |
op_doi |
https://doi.org/10.1016/j.chemosphere.2020.126001 |
container_title |
Chemosphere |
container_volume |
248 |
container_start_page |
126001 |
_version_ |
1768381348362321920 |