Overwinter thermal habitat use in lakes by anadromous Arctic char
Anadromous Arctic char (Salvelinus alpinus) migrate back to fresh water in late summer to spawn and (or) overwinter. Upon freshwater entry, feeding is reduced or absent, and movement activity is restricted. While the physiological responses to low temperatures (e.g., growth, metabolism) are understo...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
2018
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Online Access: | http://dx.doi.org/10.1139/cjfas-2017-0420 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0420 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0420 |
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crcansciencepubl:10.1139/cjfas-2017-0420 2024-06-23T07:49:27+00:00 Overwinter thermal habitat use in lakes by anadromous Arctic char Mulder, Ingeborg M. Morris, Corey J. Dempson, J. Brian Fleming, Ian A. Power, Michael 2018 http://dx.doi.org/10.1139/cjfas-2017-0420 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0420 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0420 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 75, issue 12, page 2343-2353 ISSN 0706-652X 1205-7533 journal-article 2018 crcansciencepubl https://doi.org/10.1139/cjfas-2017-0420 2024-06-13T04:10:51Z Anadromous Arctic char (Salvelinus alpinus) migrate back to fresh water in late summer to spawn and (or) overwinter. Upon freshwater entry, feeding is reduced or absent, and movement activity is restricted. While the physiological responses to low temperatures (e.g., growth, metabolism) are understood, specifics of the use of thermal habitat for overwintering remains poorly characterized. This study used acoustic and archival telemetry data from two lakes in southern Labrador, Canada, to study thermal habitat use during the ice-covered period. Results showed that lake-dwelling anadromous Arctic char predominantly occupied a narrow range of temperatures (0.5–2 °C) and used cooler temperatures available within the middle and upper water column. Use of the selected temperatures is likely a strategy that lowers metabolic costs and minimizes energy expenditure, preserving stored lipids for overwinter survival and the energetic costs of preparation for seaward migration. As Arctic char are visual feeders, use of the upper water column is also thought to aid foraging efficiency by increasing the likelihood of prey capture. Article in Journal/Newspaper Arctic Salvelinus alpinus Canadian Science Publishing Arctic Canada Canadian Journal of Fisheries and Aquatic Sciences 75 12 2343 2353 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Anadromous Arctic char (Salvelinus alpinus) migrate back to fresh water in late summer to spawn and (or) overwinter. Upon freshwater entry, feeding is reduced or absent, and movement activity is restricted. While the physiological responses to low temperatures (e.g., growth, metabolism) are understood, specifics of the use of thermal habitat for overwintering remains poorly characterized. This study used acoustic and archival telemetry data from two lakes in southern Labrador, Canada, to study thermal habitat use during the ice-covered period. Results showed that lake-dwelling anadromous Arctic char predominantly occupied a narrow range of temperatures (0.5–2 °C) and used cooler temperatures available within the middle and upper water column. Use of the selected temperatures is likely a strategy that lowers metabolic costs and minimizes energy expenditure, preserving stored lipids for overwinter survival and the energetic costs of preparation for seaward migration. As Arctic char are visual feeders, use of the upper water column is also thought to aid foraging efficiency by increasing the likelihood of prey capture. |
format |
Article in Journal/Newspaper |
author |
Mulder, Ingeborg M. Morris, Corey J. Dempson, J. Brian Fleming, Ian A. Power, Michael |
spellingShingle |
Mulder, Ingeborg M. Morris, Corey J. Dempson, J. Brian Fleming, Ian A. Power, Michael Overwinter thermal habitat use in lakes by anadromous Arctic char |
author_facet |
Mulder, Ingeborg M. Morris, Corey J. Dempson, J. Brian Fleming, Ian A. Power, Michael |
author_sort |
Mulder, Ingeborg M. |
title |
Overwinter thermal habitat use in lakes by anadromous Arctic char |
title_short |
Overwinter thermal habitat use in lakes by anadromous Arctic char |
title_full |
Overwinter thermal habitat use in lakes by anadromous Arctic char |
title_fullStr |
Overwinter thermal habitat use in lakes by anadromous Arctic char |
title_full_unstemmed |
Overwinter thermal habitat use in lakes by anadromous Arctic char |
title_sort |
overwinter thermal habitat use in lakes by anadromous arctic char |
publisher |
Canadian Science Publishing |
publishDate |
2018 |
url |
http://dx.doi.org/10.1139/cjfas-2017-0420 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0420 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0420 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Salvelinus alpinus |
genre_facet |
Arctic Salvelinus alpinus |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 75, issue 12, page 2343-2353 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2017-0420 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
75 |
container_issue |
12 |
container_start_page |
2343 |
op_container_end_page |
2353 |
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1802639856341352448 |