Abrupt environmental change in Canada's northernmost lake inferred from fossil diatom and pigment stratigraphy
An analysis of diatoms and fossil pigments in a sediment core from perennially ice-covered Ward Hunt Lake at latitude 83°N in Nunavut, Canada revealed striking changes in diatom communities and sedimentary pigment concentrations during the last two centuries. Diatoms were found only in the upper 2.5...
Published in: | Geophysical Research Letters |
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Online Access: | https://digitalcommons.lsu.edu/geo_pubs/648 https://doi.org/10.1029/2007GL030947 |
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1647 2023-06-11T04:09:31+02:00 Abrupt environmental change in Canada's northernmost lake inferred from fossil diatom and pigment stratigraphy Antoniades, Dermot Crawley, Catherine Douglas, Marianne S.V. Pienitz, Reinhard Andersen, Dale Doran, Peter T. Hawes, Ian Pollard, Wayne Vincent, Warwick F. 2007-09-28T07:00:00Z https://digitalcommons.lsu.edu/geo_pubs/648 https://doi.org/10.1029/2007GL030947 unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/648 doi:10.1029/2007GL030947 Faculty Publications text 2007 ftlouisianastuir https://doi.org/10.1029/2007GL030947 2023-05-28T18:16:59Z An analysis of diatoms and fossil pigments in a sediment core from perennially ice-covered Ward Hunt Lake at latitude 83°N in Nunavut, Canada revealed striking changes in diatom communities and sedimentary pigment concentrations during the last two centuries. Diatoms were found only in the upper 2.5 cm of the sedimentary record, and where present, diatom assemblages were composed almost entirely of Staurosirella pinnata. Photosynthetic pigments were present in low concentrations throughout the sedimentary profile, consistent with the ultra-oligotrophic nutrient status of the lake. Pigment concentrations varied slightly in the lower sections of the core, and began to increase gradually at the 4 cm horizon followed by an increase of two orders of magnitude in the uppermost 2.5 cm. The changes observed in the sedimentary record of Ward Hunt Lake had similar trajectories to those observed post-1850 elsewhere in the circumpolar Arctic, and imply that aquatic communities even in the most extreme northern lakes have been strongly impacted by recent climate warming. Copyright 2007 by the American Geophysical Union. Text Arctic Nunavut LSU Digital Commons (Louisiana State University) Arctic Canada Nunavut Geophysical Research Letters 34 18 |
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LSU Digital Commons (Louisiana State University) |
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description |
An analysis of diatoms and fossil pigments in a sediment core from perennially ice-covered Ward Hunt Lake at latitude 83°N in Nunavut, Canada revealed striking changes in diatom communities and sedimentary pigment concentrations during the last two centuries. Diatoms were found only in the upper 2.5 cm of the sedimentary record, and where present, diatom assemblages were composed almost entirely of Staurosirella pinnata. Photosynthetic pigments were present in low concentrations throughout the sedimentary profile, consistent with the ultra-oligotrophic nutrient status of the lake. Pigment concentrations varied slightly in the lower sections of the core, and began to increase gradually at the 4 cm horizon followed by an increase of two orders of magnitude in the uppermost 2.5 cm. The changes observed in the sedimentary record of Ward Hunt Lake had similar trajectories to those observed post-1850 elsewhere in the circumpolar Arctic, and imply that aquatic communities even in the most extreme northern lakes have been strongly impacted by recent climate warming. Copyright 2007 by the American Geophysical Union. |
format |
Text |
author |
Antoniades, Dermot Crawley, Catherine Douglas, Marianne S.V. Pienitz, Reinhard Andersen, Dale Doran, Peter T. Hawes, Ian Pollard, Wayne Vincent, Warwick F. |
spellingShingle |
Antoniades, Dermot Crawley, Catherine Douglas, Marianne S.V. Pienitz, Reinhard Andersen, Dale Doran, Peter T. Hawes, Ian Pollard, Wayne Vincent, Warwick F. Abrupt environmental change in Canada's northernmost lake inferred from fossil diatom and pigment stratigraphy |
author_facet |
Antoniades, Dermot Crawley, Catherine Douglas, Marianne S.V. Pienitz, Reinhard Andersen, Dale Doran, Peter T. Hawes, Ian Pollard, Wayne Vincent, Warwick F. |
author_sort |
Antoniades, Dermot |
title |
Abrupt environmental change in Canada's northernmost lake inferred from fossil diatom and pigment stratigraphy |
title_short |
Abrupt environmental change in Canada's northernmost lake inferred from fossil diatom and pigment stratigraphy |
title_full |
Abrupt environmental change in Canada's northernmost lake inferred from fossil diatom and pigment stratigraphy |
title_fullStr |
Abrupt environmental change in Canada's northernmost lake inferred from fossil diatom and pigment stratigraphy |
title_full_unstemmed |
Abrupt environmental change in Canada's northernmost lake inferred from fossil diatom and pigment stratigraphy |
title_sort |
abrupt environmental change in canada's northernmost lake inferred from fossil diatom and pigment stratigraphy |
publisher |
LSU Digital Commons |
publishDate |
2007 |
url |
https://digitalcommons.lsu.edu/geo_pubs/648 https://doi.org/10.1029/2007GL030947 |
geographic |
Arctic Canada Nunavut |
geographic_facet |
Arctic Canada Nunavut |
genre |
Arctic Nunavut |
genre_facet |
Arctic Nunavut |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/648 doi:10.1029/2007GL030947 |
op_doi |
https://doi.org/10.1029/2007GL030947 |
container_title |
Geophysical Research Letters |
container_volume |
34 |
container_issue |
18 |
_version_ |
1768383436599328768 |