Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord
The anthropogenic increase of carbon dioxide (CO 2 ) alters the seawater carbonate chemistry, with a decline of pH and an increase in the partial pressure of CO 2 ( p CO 2 ). Although bacteria play a major role in carbon cycling, little is known about the impact of rising p CO 2 on bacterial carbon...
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ftcopernicus:oai:publications.copernicus.org:bg16650 2023-05-15T15:15:09+02:00 Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord Motegi, C. Tanaka, T. Piontek, J. Brussaard, C. P. D. Gattuso, J.-P. Weinbauer, M. G. 2018-09-27 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/bg-10-3285-2013 https://www.biogeosciences.net/10/3285/2013/ eng eng info:eu-repo/grantAgreement/EC/FP7/211384 doi:10.5194/bg-10-3285-2013 https://www.biogeosciences.net/10/3285/2013/ info:eu-repo/semantics/openAccess eISSN: 1726-4189 info:eu-repo/semantics/Text 2018 ftcopernicus https://doi.org/10.5194/bg-10-3285-2013 2019-12-24T09:55:20Z The anthropogenic increase of carbon dioxide (CO 2 ) alters the seawater carbonate chemistry, with a decline of pH and an increase in the partial pressure of CO 2 ( p CO 2 ). Although bacteria play a major role in carbon cycling, little is known about the impact of rising p CO 2 on bacterial carbon metabolism, especially for natural bacterial communities. In this study, we investigated the effect of rising p CO 2 on bacterial production (BP), bacterial respiration (BR) and bacterial carbon metabolism during a mesocosm experiment performed in Kongsfjorden (Svalbard) in 2010. Nine mesocosms with p CO 2 levels ranging from ca. 180 to 1400 μatm were deployed in the fjord and monitored for 30 days. Generally BP gradually decreased in all mesocosms in an initial phase, showed a large (3.6-fold average) but temporary increase on day 10, and increased slightly after inorganic nutrient addition. Over the wide range of p CO 2 investigated, the patterns in BP and growth rate of bulk and free-living communities were generally similar over time. However, BP of the bulk community significantly decreased with increasing p CO 2 after nutrient addition (day 14). In addition, increasing p CO 2 enhanced the leucine to thymidine (Leu : TdR) ratio at the end of experiment, suggesting that p CO 2 may alter the growth balance of bacteria. Stepwise multiple regression analysis suggests that multiple factors, including p CO 2 , explained the changes of BP, growth rate and Leu : TdR ratio at the end of the experiment. In contrast to BP, no clear trend and effect of changes of p CO 2 was observed for BR, bacterial carbon demand and bacterial growth efficiency. Overall, the results suggest that changes in p CO 2 potentially influence bacterial production, growth rate and growth balance rather than the conversion of dissolved organic matter into CO 2 . Other/Unknown Material Arctic Kongsfjord* Kongsfjorden Svalbard Copernicus Publications: E-Journals Arctic Svalbard Biogeosciences 10 5 3285 3296 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The anthropogenic increase of carbon dioxide (CO 2 ) alters the seawater carbonate chemistry, with a decline of pH and an increase in the partial pressure of CO 2 ( p CO 2 ). Although bacteria play a major role in carbon cycling, little is known about the impact of rising p CO 2 on bacterial carbon metabolism, especially for natural bacterial communities. In this study, we investigated the effect of rising p CO 2 on bacterial production (BP), bacterial respiration (BR) and bacterial carbon metabolism during a mesocosm experiment performed in Kongsfjorden (Svalbard) in 2010. Nine mesocosms with p CO 2 levels ranging from ca. 180 to 1400 μatm were deployed in the fjord and monitored for 30 days. Generally BP gradually decreased in all mesocosms in an initial phase, showed a large (3.6-fold average) but temporary increase on day 10, and increased slightly after inorganic nutrient addition. Over the wide range of p CO 2 investigated, the patterns in BP and growth rate of bulk and free-living communities were generally similar over time. However, BP of the bulk community significantly decreased with increasing p CO 2 after nutrient addition (day 14). In addition, increasing p CO 2 enhanced the leucine to thymidine (Leu : TdR) ratio at the end of experiment, suggesting that p CO 2 may alter the growth balance of bacteria. Stepwise multiple regression analysis suggests that multiple factors, including p CO 2 , explained the changes of BP, growth rate and Leu : TdR ratio at the end of the experiment. In contrast to BP, no clear trend and effect of changes of p CO 2 was observed for BR, bacterial carbon demand and bacterial growth efficiency. Overall, the results suggest that changes in p CO 2 potentially influence bacterial production, growth rate and growth balance rather than the conversion of dissolved organic matter into CO 2 . |
format |
Other/Unknown Material |
author |
Motegi, C. Tanaka, T. Piontek, J. Brussaard, C. P. D. Gattuso, J.-P. Weinbauer, M. G. |
spellingShingle |
Motegi, C. Tanaka, T. Piontek, J. Brussaard, C. P. D. Gattuso, J.-P. Weinbauer, M. G. Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord |
author_facet |
Motegi, C. Tanaka, T. Piontek, J. Brussaard, C. P. D. Gattuso, J.-P. Weinbauer, M. G. |
author_sort |
Motegi, C. |
title |
Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord |
title_short |
Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord |
title_full |
Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord |
title_fullStr |
Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord |
title_full_unstemmed |
Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord |
title_sort |
effect of co2 enrichment on bacterial metabolism in an arctic fjord |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-10-3285-2013 https://www.biogeosciences.net/10/3285/2013/ |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Kongsfjord* Kongsfjorden Svalbard |
genre_facet |
Arctic Kongsfjord* Kongsfjorden Svalbard |
op_source |
eISSN: 1726-4189 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/211384 doi:10.5194/bg-10-3285-2013 https://www.biogeosciences.net/10/3285/2013/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-10-3285-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
5 |
container_start_page |
3285 |
op_container_end_page |
3296 |
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1766345528821415936 |