The Thores Lake proglacial system: remnant stability in the rapidly changing Canadian High Arctic
We describe limnological data sets from Thores Lake, a large ice-contact proglacial lake in northern Ellesmere Island, Nunavut (82.65°N), including longitudinal and cross transects (vertical resolution 0.03 m, horizontal resolution 100–200 m). The lake is formed due to damming by Thores Glacier at i...
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Canadian Science Publishing
2023
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ftdoajarticles:oai:doaj.org/article:b5861576fb34423b923ec62be6031e23 2023-10-01T03:52:30+02:00 The Thores Lake proglacial system: remnant stability in the rapidly changing Canadian High Arctic Alexander I. Culley Mary Thaler William Kochtitzky Pilipoosie Iqaluk Josephine Z. Rapp Milla Rautio Michio Kumagai Luke Copland Warwick F. Vincent Catherine Girard 2023-09-01T00:00:00Z https://doi.org/10.1139/as-2022-0023 https://doaj.org/article/b5861576fb34423b923ec62be6031e23 EN FR eng fre Canadian Science Publishing https://cdnsciencepub.com/doi/10.1139/as-2022-0023 https://doaj.org/toc/2368-7460 doi:10.1139/as-2022-0023 2368-7460 https://doaj.org/article/b5861576fb34423b923ec62be6031e23 Arctic Science, Vol 9, Iss 3, Pp 720-733 (2023) proglacial lake ultraoligotrophic Arctic microbial eukaryotes zooplankton Environmental sciences GE1-350 Environmental engineering TA170-171 article 2023 ftdoajarticles https://doi.org/10.1139/as-2022-0023 2023-09-03T00:48:51Z We describe limnological data sets from Thores Lake, a large ice-contact proglacial lake in northern Ellesmere Island, Nunavut (82.65°N), including longitudinal and cross transects (vertical resolution 0.03 m, horizontal resolution 100–200 m). The lake is formed due to damming by Thores Glacier at its northwest margin, has multi-year ice cover and a cold (<1.54 °C) fresh water column with a bottom layer of <0 °C, high-conductivity water in the deepest basin. Thores Lake is ultraoligotrophic, with low nutrient and phytoplankton stocks. Accessory pigment data and metagenomics were used to describe the eukaryotic microbial community. Diversity and taxonomic composition in the water column were homogeneous down to a depth of 40 m, consistent with density profiles. Surface water at the glacier interface was characterized by high turbidity and total phosphorus concentrations, and a distinct phytoplankton community dominated by chlorophytes, whereas the lake water column had higher relative abundances of chrysophytes and photosynthetic dinoflagellates. Thores Lake has a contracted pelagic food web, with the highest trophic level occupied by phytoplankton-feeding rotifers, and no crustacean zooplankton; profiles showed that omega-3 fatty acids (FAs) ranged from <1% (glacier interface) to 3.6% (central lake) of total seston FAs. Given the stability of the Thores Glacier ice dam and the persistence of cold water capped by perennial ice, Thores Lake provides a baseline to assess the impact of climate change on far northern lakes. Article in Journal/Newspaper Arctic Arctic Climate change Ellesmere Island Nunavut Phytoplankton Zooplankton Directory of Open Access Journals: DOAJ Articles Arctic Ellesmere Island Nunavut Thores Lake ENVELOPE(-73.683,-73.683,82.650,82.650) Arctic Science |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English French |
topic |
proglacial lake ultraoligotrophic Arctic microbial eukaryotes zooplankton Environmental sciences GE1-350 Environmental engineering TA170-171 |
spellingShingle |
proglacial lake ultraoligotrophic Arctic microbial eukaryotes zooplankton Environmental sciences GE1-350 Environmental engineering TA170-171 Alexander I. Culley Mary Thaler William Kochtitzky Pilipoosie Iqaluk Josephine Z. Rapp Milla Rautio Michio Kumagai Luke Copland Warwick F. Vincent Catherine Girard The Thores Lake proglacial system: remnant stability in the rapidly changing Canadian High Arctic |
topic_facet |
proglacial lake ultraoligotrophic Arctic microbial eukaryotes zooplankton Environmental sciences GE1-350 Environmental engineering TA170-171 |
description |
We describe limnological data sets from Thores Lake, a large ice-contact proglacial lake in northern Ellesmere Island, Nunavut (82.65°N), including longitudinal and cross transects (vertical resolution 0.03 m, horizontal resolution 100–200 m). The lake is formed due to damming by Thores Glacier at its northwest margin, has multi-year ice cover and a cold (<1.54 °C) fresh water column with a bottom layer of <0 °C, high-conductivity water in the deepest basin. Thores Lake is ultraoligotrophic, with low nutrient and phytoplankton stocks. Accessory pigment data and metagenomics were used to describe the eukaryotic microbial community. Diversity and taxonomic composition in the water column were homogeneous down to a depth of 40 m, consistent with density profiles. Surface water at the glacier interface was characterized by high turbidity and total phosphorus concentrations, and a distinct phytoplankton community dominated by chlorophytes, whereas the lake water column had higher relative abundances of chrysophytes and photosynthetic dinoflagellates. Thores Lake has a contracted pelagic food web, with the highest trophic level occupied by phytoplankton-feeding rotifers, and no crustacean zooplankton; profiles showed that omega-3 fatty acids (FAs) ranged from <1% (glacier interface) to 3.6% (central lake) of total seston FAs. Given the stability of the Thores Glacier ice dam and the persistence of cold water capped by perennial ice, Thores Lake provides a baseline to assess the impact of climate change on far northern lakes. |
format |
Article in Journal/Newspaper |
author |
Alexander I. Culley Mary Thaler William Kochtitzky Pilipoosie Iqaluk Josephine Z. Rapp Milla Rautio Michio Kumagai Luke Copland Warwick F. Vincent Catherine Girard |
author_facet |
Alexander I. Culley Mary Thaler William Kochtitzky Pilipoosie Iqaluk Josephine Z. Rapp Milla Rautio Michio Kumagai Luke Copland Warwick F. Vincent Catherine Girard |
author_sort |
Alexander I. Culley |
title |
The Thores Lake proglacial system: remnant stability in the rapidly changing Canadian High Arctic |
title_short |
The Thores Lake proglacial system: remnant stability in the rapidly changing Canadian High Arctic |
title_full |
The Thores Lake proglacial system: remnant stability in the rapidly changing Canadian High Arctic |
title_fullStr |
The Thores Lake proglacial system: remnant stability in the rapidly changing Canadian High Arctic |
title_full_unstemmed |
The Thores Lake proglacial system: remnant stability in the rapidly changing Canadian High Arctic |
title_sort |
thores lake proglacial system: remnant stability in the rapidly changing canadian high arctic |
publisher |
Canadian Science Publishing |
publishDate |
2023 |
url |
https://doi.org/10.1139/as-2022-0023 https://doaj.org/article/b5861576fb34423b923ec62be6031e23 |
long_lat |
ENVELOPE(-73.683,-73.683,82.650,82.650) |
geographic |
Arctic Ellesmere Island Nunavut Thores Lake |
geographic_facet |
Arctic Ellesmere Island Nunavut Thores Lake |
genre |
Arctic Arctic Climate change Ellesmere Island Nunavut Phytoplankton Zooplankton |
genre_facet |
Arctic Arctic Climate change Ellesmere Island Nunavut Phytoplankton Zooplankton |
op_source |
Arctic Science, Vol 9, Iss 3, Pp 720-733 (2023) |
op_relation |
https://cdnsciencepub.com/doi/10.1139/as-2022-0023 https://doaj.org/toc/2368-7460 doi:10.1139/as-2022-0023 2368-7460 https://doaj.org/article/b5861576fb34423b923ec62be6031e23 |
op_doi |
https://doi.org/10.1139/as-2022-0023 |
container_title |
Arctic Science |
_version_ |
1778518658806448128 |