The littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered High Arctic lake
In ice-covered polar lakes, a narrow ice-free moat opens up in spring or early summer, and then persists at the edge of the lake until complete ice loss or refreezing. In this study, we analyzed the horizontal gradients in Ward Hunt Lake, located in the High Arctic, and addressed the hypothesis that...
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Canadian Science Publishing (NRC Research Press)
2020
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fttriple:oai:gotriple.eu:http://hdl.handle.net/20.500.11794/66949 2023-05-15T13:56:43+02:00 The littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered High Arctic lake Bégin, Paschale Noël Culley, Alexander Vincent, Warwick F. Rautio, Milla Tanabe, Yukiko Uchida, Masaki Régions polaires Arctique Antarctique 2020-09-23 https://hdl.handle.net/20.500.11794/66949 en eng Canadian Science Publishing (NRC Research Press) http://hdl.handle.net/20.500.11794/66949 CorpusUL geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/20.500.11794/66949 2023-01-22T17:10:05Z In ice-covered polar lakes, a narrow ice-free moat opens up in spring or early summer, and then persists at the edge of the lake until complete ice loss or refreezing. In this study, we analyzed the horizontal gradients in Ward Hunt Lake, located in the High Arctic, and addressed the hypothesis that the transition from its nearshore open-water moat to offshore ice-covered waters is marked by discontinuous shifts in limnological properties. Consistent with this hypothesis, we observed an abrupt increase in below-ice concentrations of chlorophyll a beyond the ice margin, along with a sharp decrease in temperature and light availability and pronounced changes in benthic algal pigments and fatty acids. There were higher concentrations of rotifers and lower concentrations of viruses at the ice-free sampling sites, and contrasts in zooplankton fatty acid profiles that implied a greater importance of benthic phototrophs in their inshore diet. The observed patterns underscore the structuring role of ice cover in polar lakes. These ecosystems do not conform to the traditional definitions of littoral versus pelagic zones, but instead may have distinct moat, icemargin and ice-covered zones. This zonation is likely to weaken with ongoing climate change. Article in Journal/Newspaper Antarc* Antarctique* Arctic Arctique* Climate change Zooplankton ice covered waters Unknown Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) |
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Open Polar |
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fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Bégin, Paschale Noël Culley, Alexander Vincent, Warwick F. Rautio, Milla Tanabe, Yukiko Uchida, Masaki The littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered High Arctic lake |
topic_facet |
geo envir |
description |
In ice-covered polar lakes, a narrow ice-free moat opens up in spring or early summer, and then persists at the edge of the lake until complete ice loss or refreezing. In this study, we analyzed the horizontal gradients in Ward Hunt Lake, located in the High Arctic, and addressed the hypothesis that the transition from its nearshore open-water moat to offshore ice-covered waters is marked by discontinuous shifts in limnological properties. Consistent with this hypothesis, we observed an abrupt increase in below-ice concentrations of chlorophyll a beyond the ice margin, along with a sharp decrease in temperature and light availability and pronounced changes in benthic algal pigments and fatty acids. There were higher concentrations of rotifers and lower concentrations of viruses at the ice-free sampling sites, and contrasts in zooplankton fatty acid profiles that implied a greater importance of benthic phototrophs in their inshore diet. The observed patterns underscore the structuring role of ice cover in polar lakes. These ecosystems do not conform to the traditional definitions of littoral versus pelagic zones, but instead may have distinct moat, icemargin and ice-covered zones. This zonation is likely to weaken with ongoing climate change. |
format |
Article in Journal/Newspaper |
author |
Bégin, Paschale Noël Culley, Alexander Vincent, Warwick F. Rautio, Milla Tanabe, Yukiko Uchida, Masaki |
author_facet |
Bégin, Paschale Noël Culley, Alexander Vincent, Warwick F. Rautio, Milla Tanabe, Yukiko Uchida, Masaki |
author_sort |
Bégin, Paschale Noël |
title |
The littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered High Arctic lake |
title_short |
The littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered High Arctic lake |
title_full |
The littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered High Arctic lake |
title_fullStr |
The littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered High Arctic lake |
title_full_unstemmed |
The littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered High Arctic lake |
title_sort |
littoral zone of polar lakes : inshore-offshore contrasts in an ice-covered high arctic lake |
publisher |
Canadian Science Publishing (NRC Research Press) |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11794/66949 |
op_coverage |
Régions polaires Arctique Antarctique |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake |
geographic_facet |
Arctic Arctic Lake |
genre |
Antarc* Antarctique* Arctic Arctique* Climate change Zooplankton ice covered waters |
genre_facet |
Antarc* Antarctique* Arctic Arctique* Climate change Zooplankton ice covered waters |
op_source |
CorpusUL |
op_relation |
http://hdl.handle.net/20.500.11794/66949 |
op_doi |
https://doi.org/20.500.11794/66949 |
_version_ |
1766264297133965312 |