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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Online Access: | https://doi.org/10.1139/as-2016-0013 https://doaj.org/article/038c3f13a38a477791a85f89c0da03d9 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:038c3f13a38a477791a85f89c0da03d9 2023-05-15T14:22:20+02:00 Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada Tara M. Paull Sarah A. Finkelstein Konrad Gajewski 2017-03-01 https://doi.org/10.1139/as-2016-0013 https://doaj.org/article/038c3f13a38a477791a85f89c0da03d9 en fr eng fre Canadian Science Publishing doi:10.1139/as-2016-0013 2368-7460 https://doaj.org/article/038c3f13a38a477791a85f89c0da03d9 undefined Arctic Science, Vol 3, Iss 1, Pp 17-38 (2017) paleoclimate holocene canadian arctic archipelago lake sediments diatoms paleolimnology pollen diatom dissolution envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.1139/as-2016-0013 2023-01-22T18:04:22Z 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 Arctic Archipelago Arctic Canadian Arctic Archipelago Nunavut Somerset Island Unknown Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Canada Canadian Arctic Archipelago Nunavut Somerset Island ENVELOPE(-93.500,-93.500,73.251,73.251) Arctic Science 3 1 17 38 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English French |
topic |
paleoclimate holocene canadian arctic archipelago lake sediments diatoms paleolimnology pollen diatom dissolution envir geo |
spellingShingle |
paleoclimate holocene canadian arctic archipelago lake sediments diatoms paleolimnology pollen diatom dissolution envir geo Tara M. Paull Sarah A. Finkelstein Konrad Gajewski Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada |
topic_facet |
paleoclimate holocene canadian arctic archipelago lake sediments diatoms paleolimnology pollen diatom dissolution envir geo |
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 |
Tara M. Paull Sarah A. Finkelstein Konrad Gajewski |
author_facet |
Tara M. Paull Sarah A. Finkelstein Konrad Gajewski |
author_sort |
Tara M. Paull |
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 |
https://doi.org/10.1139/as-2016-0013 https://doaj.org/article/038c3f13a38a477791a85f89c0da03d9 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) ENVELOPE(-93.500,-93.500,73.251,73.251) |
geographic |
Arctic Arctic Lake Canada Canadian Arctic Archipelago Nunavut Somerset Island |
geographic_facet |
Arctic Arctic Lake Canada Canadian Arctic Archipelago Nunavut Somerset Island |
genre |
Arctic Arctic Archipelago Arctic Canadian Arctic Archipelago Nunavut Somerset Island |
genre_facet |
Arctic Arctic Archipelago Arctic Canadian Arctic Archipelago Nunavut Somerset Island |
op_source |
Arctic Science, Vol 3, Iss 1, Pp 17-38 (2017) |
op_relation |
doi:10.1139/as-2016-0013 2368-7460 https://doaj.org/article/038c3f13a38a477791a85f89c0da03d9 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1139/as-2016-0013 |
container_title |
Arctic Science |
container_volume |
3 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
38 |
_version_ |
1766294955163123712 |