Chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes
Rapid stratigraphic changes are recorded in recent assemblages of subfossil Chrysophyceae from the sediments of two highly contrasted arctic lakes, one situated in the polar desert of west-central Ellesmere Island, and the other on eastern Baffin Island in the mid-Arctic climatic zone. In Sawtooth L...
Published in: | Canadian Journal of Botany |
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Online Access: | http://dx.doi.org/10.1139/b01-044 http://www.nrcresearchpress.com/doi/pdf/10.1139/b01-044 |
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crcansciencepubl:10.1139/b01-044 2023-12-17T10:23:39+01:00 Chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes Wolfe, Alexander P Perren, Bianca B 2001 http://dx.doi.org/10.1139/b01-044 http://www.nrcresearchpress.com/doi/pdf/10.1139/b01-044 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 79, issue 6, page 747-752 ISSN 0008-4026 Plant Science journal-article 2001 crcansciencepubl https://doi.org/10.1139/b01-044 2023-11-19T13:38:44Z Rapid stratigraphic changes are recorded in recent assemblages of subfossil Chrysophyceae from the sediments of two highly contrasted arctic lakes, one situated in the polar desert of west-central Ellesmere Island, and the other on eastern Baffin Island in the mid-Arctic climatic zone. In Sawtooth Lake on the Fosheim Peninsula, concentrations of chrysophycean stomatocysts increase dramatically in sediments deposited since AD 1920. Only trace abundances of stomatocysts are encountered in older sediments. In Kekerturnak Lake, on the north coast of Cumberland Peninsula, scales of Mallomonas spp., previously absent from the sediment record, appear suddenly in the upper 5.5 cm of sediment and subsequently become ubiquitous in the top 1.0 cm. These results corroborate diatom stratigraphic data from other sites in the Canadian Arctic Archipelago, together suggesting that unprecedented ecological changes are presently occurring across this vast region. In all likelihood, these abrupt algal community shifts reflect the response of arctic lake ecosystems to well-documented climate warming since the Little Ice Age, with the implications that recent rates of environmental change are unprecedented in the context of the Holocene.Key words: Paleolimnology, arctic lakes, Chrysophyceae, stomatocysts, Mallomonas. Article in Journal/Newspaper Arctic Archipelago Arctic Baffin Island Baffin Canadian Arctic Archipelago Cumberland Peninsula Ellesmere Island Fosheim Peninsula polar desert Canadian Science Publishing (via Crossref) Arctic Baffin Island Ellesmere Island Canadian Arctic Archipelago Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Cumberland Peninsula ENVELOPE(-64.497,-64.497,66.501,66.501) Fosheim Peninsula ENVELOPE(-83.749,-83.749,79.669,79.669) Canadian Journal of Botany 79 6 747 752 |
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Canadian Science Publishing (via Crossref) |
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crcansciencepubl |
language |
English |
topic |
Plant Science |
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Plant Science Wolfe, Alexander P Perren, Bianca B Chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes |
topic_facet |
Plant Science |
description |
Rapid stratigraphic changes are recorded in recent assemblages of subfossil Chrysophyceae from the sediments of two highly contrasted arctic lakes, one situated in the polar desert of west-central Ellesmere Island, and the other on eastern Baffin Island in the mid-Arctic climatic zone. In Sawtooth Lake on the Fosheim Peninsula, concentrations of chrysophycean stomatocysts increase dramatically in sediments deposited since AD 1920. Only trace abundances of stomatocysts are encountered in older sediments. In Kekerturnak Lake, on the north coast of Cumberland Peninsula, scales of Mallomonas spp., previously absent from the sediment record, appear suddenly in the upper 5.5 cm of sediment and subsequently become ubiquitous in the top 1.0 cm. These results corroborate diatom stratigraphic data from other sites in the Canadian Arctic Archipelago, together suggesting that unprecedented ecological changes are presently occurring across this vast region. In all likelihood, these abrupt algal community shifts reflect the response of arctic lake ecosystems to well-documented climate warming since the Little Ice Age, with the implications that recent rates of environmental change are unprecedented in the context of the Holocene.Key words: Paleolimnology, arctic lakes, Chrysophyceae, stomatocysts, Mallomonas. |
format |
Article in Journal/Newspaper |
author |
Wolfe, Alexander P Perren, Bianca B |
author_facet |
Wolfe, Alexander P Perren, Bianca B |
author_sort |
Wolfe, Alexander P |
title |
Chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes |
title_short |
Chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes |
title_full |
Chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes |
title_fullStr |
Chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes |
title_full_unstemmed |
Chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes |
title_sort |
chrysophyte microfossils record marked responses to recent environmental changes in high- and mid-arctic lakes |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/b01-044 http://www.nrcresearchpress.com/doi/pdf/10.1139/b01-044 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) ENVELOPE(-64.497,-64.497,66.501,66.501) ENVELOPE(-83.749,-83.749,79.669,79.669) |
geographic |
Arctic Baffin Island Ellesmere Island Canadian Arctic Archipelago Arctic Lake Cumberland Peninsula Fosheim Peninsula |
geographic_facet |
Arctic Baffin Island Ellesmere Island Canadian Arctic Archipelago Arctic Lake Cumberland Peninsula Fosheim Peninsula |
genre |
Arctic Archipelago Arctic Baffin Island Baffin Canadian Arctic Archipelago Cumberland Peninsula Ellesmere Island Fosheim Peninsula polar desert |
genre_facet |
Arctic Archipelago Arctic Baffin Island Baffin Canadian Arctic Archipelago Cumberland Peninsula Ellesmere Island Fosheim Peninsula polar desert |
op_source |
Canadian Journal of Botany volume 79, issue 6, page 747-752 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b01-044 |
container_title |
Canadian Journal of Botany |
container_volume |
79 |
container_issue |
6 |
container_start_page |
747 |
op_container_end_page |
752 |
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1785559412242382848 |