Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada
This study presents a diatom-based analysis of the post-glacial Holocene environmental history at Lake RS29 on Somerset Island in the Canadian High Arctic. Earliest post-glacial diatom assemblages (10 200–10 000 cal yr BP) consisted mainly of small, benthic fragilarioid taxa. Poor diatom preservatio...
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2017
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crcansciencepubl:10.1139/as-2016-0013 2024-09-15T17:49:58+00:00 Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada Paull, Tara M. Finkelstein, Sarah A. Gajewski, Konrad 2017 http://dx.doi.org/10.1139/as-2016-0013 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2016-0013 https://cdnsciencepub.com/doi/pdf/10.1139/as-2016-0013 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Arctic Science volume 3, issue 1, page 17-38 ISSN 2368-7460 2368-7460 journal-article 2017 crcansciencepubl https://doi.org/10.1139/as-2016-0013 2024-08-29T04:08:49Z This study presents a diatom-based analysis of the post-glacial Holocene environmental history at Lake RS29 on Somerset Island in the Canadian High Arctic. Earliest post-glacial diatom assemblages (10 200–10 000 cal yr BP) consisted mainly of small, benthic fragilarioid taxa. Poor diatom preservation in the early Holocene (~10 000–6200 cal yr BP) is associated with warm conditions, as determined by pollen data from the same core and other paleoclimate estimates from the region. Analysis of this and other sites from across the Canadian Arctic suggest that zones of poor diatom preservation or diatom absence in lake sediment records may be associated with warm conditions. After 6200 cal yr BP, acidophilic assemblages consisting of Aulacoseira spp. and a suite of periphytic taxa indicate acidification since the mid-Holocene. During this time period, cooling causing changes in lake ice phenology was likely a major driver of the reconstructed mid-Holocene pH decline. Watershed processes, including reduced fluxes of base cations as the rate of sediment accumulation slowed, may also be contributors to long-term shifts in lake water pH and associated changes in diatom assemblages. The uppermost sediments in the Lake RS29 record were characterized by abrupt declines in Aulacoseira alpigena and increases in benthic diatom taxa Cyclotella sensu lato, suggesting an increase in lake water pH and longer ice-free seasons. Article in Journal/Newspaper Arctic Nunavut Somerset Island Canadian Science Publishing Arctic Science 3 1 17 38 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
This study presents a diatom-based analysis of the post-glacial Holocene environmental history at Lake RS29 on Somerset Island in the Canadian High Arctic. Earliest post-glacial diatom assemblages (10 200–10 000 cal yr BP) consisted mainly of small, benthic fragilarioid taxa. Poor diatom preservation in the early Holocene (~10 000–6200 cal yr BP) is associated with warm conditions, as determined by pollen data from the same core and other paleoclimate estimates from the region. Analysis of this and other sites from across the Canadian Arctic suggest that zones of poor diatom preservation or diatom absence in lake sediment records may be associated with warm conditions. After 6200 cal yr BP, acidophilic assemblages consisting of Aulacoseira spp. and a suite of periphytic taxa indicate acidification since the mid-Holocene. During this time period, cooling causing changes in lake ice phenology was likely a major driver of the reconstructed mid-Holocene pH decline. Watershed processes, including reduced fluxes of base cations as the rate of sediment accumulation slowed, may also be contributors to long-term shifts in lake water pH and associated changes in diatom assemblages. The uppermost sediments in the Lake RS29 record were characterized by abrupt declines in Aulacoseira alpigena and increases in benthic diatom taxa Cyclotella sensu lato, suggesting an increase in lake water pH and longer ice-free seasons. |
format |
Article in Journal/Newspaper |
author |
Paull, Tara M. Finkelstein, Sarah A. Gajewski, Konrad |
spellingShingle |
Paull, Tara M. Finkelstein, Sarah A. Gajewski, Konrad Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada |
author_facet |
Paull, Tara M. Finkelstein, Sarah A. Gajewski, Konrad |
author_sort |
Paull, Tara M. |
title |
Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada |
title_short |
Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada |
title_full |
Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada |
title_fullStr |
Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada |
title_full_unstemmed |
Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada |
title_sort |
interactions between climate and landscape drive holocene ecological change in a high arctic lake on somerset island, nunavut, canada |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
http://dx.doi.org/10.1139/as-2016-0013 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2016-0013 https://cdnsciencepub.com/doi/pdf/10.1139/as-2016-0013 |
genre |
Arctic Nunavut Somerset Island |
genre_facet |
Arctic Nunavut Somerset Island |
op_source |
Arctic Science volume 3, issue 1, page 17-38 ISSN 2368-7460 2368-7460 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/as-2016-0013 |
container_title |
Arctic Science |
container_volume |
3 |
container_issue |
1 |
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17 |
op_container_end_page |
38 |
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1810291803934425088 |