Systematic microbial production of optically active dissolved organic matter in subarctic lake water
The ecology and biogeochemistry of lakes in the subarctic region are particularly sensitive to changes in the abundance and optical properties of dissolved organic matter (DOM). External input of colored DOM to these lakes is an extensively researched topic, but little is known about potential recip...
Published in: | Limnology and Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://lup.lub.lu.se/record/c363e02e-efc1-4f8b-893b-31ff7ff56782 https://doi.org/10.1002/lno.11362 |
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ftulundlup:oai:lup.lub.lu.se:c363e02e-efc1-4f8b-893b-31ff7ff56782 2023-05-15T17:44:46+02:00 Systematic microbial production of optically active dissolved organic matter in subarctic lake water Berggren, Martin Gudasz, Cristian Guillemette, Francois Hensgens, Geert Ye, Linlin Karlsson, Jan 2020-05 https://lup.lub.lu.se/record/c363e02e-efc1-4f8b-893b-31ff7ff56782 https://doi.org/10.1002/lno.11362 eng eng ASLO https://lup.lub.lu.se/record/c363e02e-efc1-4f8b-893b-31ff7ff56782 http://dx.doi.org/10.1002/lno.11362 scopus:85074762468 Limnology and Oceanography; 65(5), pp 951-961 (2020) ISSN: 1939-5590 Oceanography Hydrology Water Resources contributiontojournal/article info:eu-repo/semantics/article text 2020 ftulundlup https://doi.org/10.1002/lno.11362 2023-02-01T23:39:41Z The ecology and biogeochemistry of lakes in the subarctic region are particularly sensitive to changes in the abundance and optical properties of dissolved organic matter (DOM). External input of colored DOM to these lakes is an extensively researched topic, but little is known about potential reciprocal feedbacks between the optical properties of DOM and internal microbial processes in the water. We performed 28-day dark laboratory incubation trials on water from 101 subarctic tundra lakes in northern Sweden, measuring the microbial decay of DOM and the resulting dynamics in colored (CDOM) and fluorescent (FDOM) DOM components. While losses in dissolved oxygen during the incubations corresponded to a 20% decrease in mean DOM, conversely the mean CDOM and total FDOM increased by 22% and 30%, respectively. However, the patterns in microbial transformation of the DOM were not the same in all lakes. Notably, along the gradient of increasing ambient CDOM (water brownness), the lakes showed decreased microbial production of protein-like fluorescence, lowered DOM turnover rates and decreasing bacterial growth per unit of DOM. These trends indicate that browning of subarctic lakes systematically change the way that bacteria interact with the ambient DOM pool. Our study underscores that there is no unidirectional causal link between microbial processes and DOM optical properties, but rather reciprocal dependence between the two. Article in Journal/Newspaper Northern Sweden Subarctic Tundra Lund University Publications (LUP) Browning ENVELOPE(164.050,164.050,-74.617,-74.617) Limnology and Oceanography 65 5 951 961 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Oceanography Hydrology Water Resources |
spellingShingle |
Oceanography Hydrology Water Resources Berggren, Martin Gudasz, Cristian Guillemette, Francois Hensgens, Geert Ye, Linlin Karlsson, Jan Systematic microbial production of optically active dissolved organic matter in subarctic lake water |
topic_facet |
Oceanography Hydrology Water Resources |
description |
The ecology and biogeochemistry of lakes in the subarctic region are particularly sensitive to changes in the abundance and optical properties of dissolved organic matter (DOM). External input of colored DOM to these lakes is an extensively researched topic, but little is known about potential reciprocal feedbacks between the optical properties of DOM and internal microbial processes in the water. We performed 28-day dark laboratory incubation trials on water from 101 subarctic tundra lakes in northern Sweden, measuring the microbial decay of DOM and the resulting dynamics in colored (CDOM) and fluorescent (FDOM) DOM components. While losses in dissolved oxygen during the incubations corresponded to a 20% decrease in mean DOM, conversely the mean CDOM and total FDOM increased by 22% and 30%, respectively. However, the patterns in microbial transformation of the DOM were not the same in all lakes. Notably, along the gradient of increasing ambient CDOM (water brownness), the lakes showed decreased microbial production of protein-like fluorescence, lowered DOM turnover rates and decreasing bacterial growth per unit of DOM. These trends indicate that browning of subarctic lakes systematically change the way that bacteria interact with the ambient DOM pool. Our study underscores that there is no unidirectional causal link between microbial processes and DOM optical properties, but rather reciprocal dependence between the two. |
format |
Article in Journal/Newspaper |
author |
Berggren, Martin Gudasz, Cristian Guillemette, Francois Hensgens, Geert Ye, Linlin Karlsson, Jan |
author_facet |
Berggren, Martin Gudasz, Cristian Guillemette, Francois Hensgens, Geert Ye, Linlin Karlsson, Jan |
author_sort |
Berggren, Martin |
title |
Systematic microbial production of optically active dissolved organic matter in subarctic lake water |
title_short |
Systematic microbial production of optically active dissolved organic matter in subarctic lake water |
title_full |
Systematic microbial production of optically active dissolved organic matter in subarctic lake water |
title_fullStr |
Systematic microbial production of optically active dissolved organic matter in subarctic lake water |
title_full_unstemmed |
Systematic microbial production of optically active dissolved organic matter in subarctic lake water |
title_sort |
systematic microbial production of optically active dissolved organic matter in subarctic lake water |
publisher |
ASLO |
publishDate |
2020 |
url |
https://lup.lub.lu.se/record/c363e02e-efc1-4f8b-893b-31ff7ff56782 https://doi.org/10.1002/lno.11362 |
long_lat |
ENVELOPE(164.050,164.050,-74.617,-74.617) |
geographic |
Browning |
geographic_facet |
Browning |
genre |
Northern Sweden Subarctic Tundra |
genre_facet |
Northern Sweden Subarctic Tundra |
op_source |
Limnology and Oceanography; 65(5), pp 951-961 (2020) ISSN: 1939-5590 |
op_relation |
https://lup.lub.lu.se/record/c363e02e-efc1-4f8b-893b-31ff7ff56782 http://dx.doi.org/10.1002/lno.11362 scopus:85074762468 |
op_doi |
https://doi.org/10.1002/lno.11362 |
container_title |
Limnology and Oceanography |
container_volume |
65 |
container_issue |
5 |
container_start_page |
951 |
op_container_end_page |
961 |
_version_ |
1766147053321191424 |