Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake
We studied a small subarctic lake to assess the magnitude of winter respiration and the organic carbon (OC) source for this respiration. The concentration and stable isotopic composition (δ 13 C) of dissolved inorganic carbon (DIC) accumulating in the lake water under ice was analyzed over one winte...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2008.53.3.0948 2024-09-15T18:37:57+00:00 Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake Karlsson, Jan Ask, Jenny Jansson, Mats 2008 http://dx.doi.org/10.4319/lo.2008.53.3.0948 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2008.53.3.0948 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2008.53.3.0948 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 53, issue 3, page 948-954 ISSN 0024-3590 1939-5590 journal-article 2008 crwiley https://doi.org/10.4319/lo.2008.53.3.0948 2024-07-09T04:14:46Z We studied a small subarctic lake to assess the magnitude of winter respiration and the organic carbon (OC) source for this respiration. The concentration and stable isotopic composition (δ 13 C) of dissolved inorganic carbon (DIC) accumulating in the lake water under ice was analyzed over one winter (7 months). The DIC concentration increased and the δ 13 C of DIC decreased over time, with the greatest changes at the lake bottom. Winter respiration was 26% of annual respiration in the lake. Keeling plot analysis demonstrated that the δ 13 C of respired DIC varied spatially, high δ 13 C values occurring at shallow (2.5 m, 221.7‰%) compared with intermediate (4 m, 225.1‰) and deep (6 m, 227.8‰) locations in the lake. The variation in the δ 13 C of respired DIC was related to the variation in the δ 13 C of the sediments between locations, suggesting that sediment OC supported much of the winter respiration and that the dominant OC source for respiration was OC from benthic algae at shallow locations and settled OC, of predominately terrestrial origin, at deep locations. The respiration of OC from benthic algae constituted 55% of the winter respiration, equaling 54% of the primary production by benthic algae the previous summer. The study indicates the importance of temporal and spatial variation in respiration for the metabolism and net DIC production in unproductive high‐latitude lakes; both allochthonous and autochthonous carbon can contribute to winter DIC accumulation and, consequently, to spring CO 2 emissions from lakes. Article in Journal/Newspaper Subarctic Wiley Online Library Limnology and Oceanography 53 3 948 954 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
We studied a small subarctic lake to assess the magnitude of winter respiration and the organic carbon (OC) source for this respiration. The concentration and stable isotopic composition (δ 13 C) of dissolved inorganic carbon (DIC) accumulating in the lake water under ice was analyzed over one winter (7 months). The DIC concentration increased and the δ 13 C of DIC decreased over time, with the greatest changes at the lake bottom. Winter respiration was 26% of annual respiration in the lake. Keeling plot analysis demonstrated that the δ 13 C of respired DIC varied spatially, high δ 13 C values occurring at shallow (2.5 m, 221.7‰%) compared with intermediate (4 m, 225.1‰) and deep (6 m, 227.8‰) locations in the lake. The variation in the δ 13 C of respired DIC was related to the variation in the δ 13 C of the sediments between locations, suggesting that sediment OC supported much of the winter respiration and that the dominant OC source for respiration was OC from benthic algae at shallow locations and settled OC, of predominately terrestrial origin, at deep locations. The respiration of OC from benthic algae constituted 55% of the winter respiration, equaling 54% of the primary production by benthic algae the previous summer. The study indicates the importance of temporal and spatial variation in respiration for the metabolism and net DIC production in unproductive high‐latitude lakes; both allochthonous and autochthonous carbon can contribute to winter DIC accumulation and, consequently, to spring CO 2 emissions from lakes. |
format |
Article in Journal/Newspaper |
author |
Karlsson, Jan Ask, Jenny Jansson, Mats |
spellingShingle |
Karlsson, Jan Ask, Jenny Jansson, Mats Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake |
author_facet |
Karlsson, Jan Ask, Jenny Jansson, Mats |
author_sort |
Karlsson, Jan |
title |
Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake |
title_short |
Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake |
title_full |
Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake |
title_fullStr |
Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake |
title_full_unstemmed |
Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake |
title_sort |
winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear‐water lake |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.4319/lo.2008.53.3.0948 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2008.53.3.0948 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2008.53.3.0948 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Limnology and Oceanography volume 53, issue 3, page 948-954 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2008.53.3.0948 |
container_title |
Limnology and Oceanography |
container_volume |
53 |
container_issue |
3 |
container_start_page |
948 |
op_container_end_page |
954 |
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1810482295258218496 |