Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord
he anthropogenic increase of carbon dioxide (CO2) alters the seawater carbonate chemistry, with a decline of pH and an increase in the partial pressure of CO2 (pCO2). Although bacteria play a major role in carbon cycling, little is known about the impact of rising pCO2 on bacterial carbon metabolism...
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Copernicus Publications (EGU)
2013
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Online Access: | https://oceanrep.geomar.de/id/eprint/21532/ https://oceanrep.geomar.de/id/eprint/21532/1/bg-10-3285-2013.pdf https://doi.org/10.5194/bg-10-3285-2013 |
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ftoceanrep:oai:oceanrep.geomar.de:21532 2023-05-15T14:27:09+02:00 Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord Motegi, C. Tanaka, T. Piontek, Judith Brussaard, C. P. D. Gattuso, J.-P. Weinbauer, M. G. 2013 text https://oceanrep.geomar.de/id/eprint/21532/ https://oceanrep.geomar.de/id/eprint/21532/1/bg-10-3285-2013.pdf https://doi.org/10.5194/bg-10-3285-2013 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/21532/1/bg-10-3285-2013.pdf Motegi, C., Tanaka, T., Piontek, J. , Brussaard, C. P. D., Gattuso, J. P. and Weinbauer, M. G. (2013) Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord. Open Access Biogeosciences (BG), 10 (5). pp. 3285-3296. DOI 10.5194/bg-10-3285-2013 <https://doi.org/10.5194/bg-10-3285-2013>. doi:10.5194/bg-10-3285-2013 cc_by info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2013 ftoceanrep https://doi.org/10.5194/bg-10-3285-2013 2023-04-07T15:09:49Z he anthropogenic increase of carbon dioxide (CO2) alters the seawater carbonate chemistry, with a decline of pH and an increase in the partial pressure of CO2 (pCO2). Although bacteria play a major role in carbon cycling, little is known about the impact of rising pCO2 on bacterial carbon metabolism, especially for natural bacterial communities. In this study, we investigated the effect of rising pCO2 on bacterial production (BP), bacterial respiration (BR) and bacterial carbon metabolism during a mesocosm experiment performed in Kongsfjorden (Svalbard) in 2010. Nine mesocosms with pCO2 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 pCO2 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 pCO2 after nutrient addition (day 14). In addition, increasing pCO2 enhanced the leucine to thymidine (Leu : TdR) ratio at the end of experiment, suggesting that pCO2 may alter the growth balance of bacteria. Stepwise multiple regression analysis suggests that multiple factors, including pCO2, 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 pCO2 was observed for BR, bacterial carbon demand and bacterial growth efficiency. Overall, the results suggest that changes in pCO2 potentially influence bacterial production, growth rate and growth balance rather than the conversion of dissolved organic matter into CO2. Article in Journal/Newspaper Arctic Arctic Kongsfjord* Kongsfjorden Svalbard OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Svalbard Biogeosciences 10 5 3285 3296 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
he anthropogenic increase of carbon dioxide (CO2) alters the seawater carbonate chemistry, with a decline of pH and an increase in the partial pressure of CO2 (pCO2). Although bacteria play a major role in carbon cycling, little is known about the impact of rising pCO2 on bacterial carbon metabolism, especially for natural bacterial communities. In this study, we investigated the effect of rising pCO2 on bacterial production (BP), bacterial respiration (BR) and bacterial carbon metabolism during a mesocosm experiment performed in Kongsfjorden (Svalbard) in 2010. Nine mesocosms with pCO2 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 pCO2 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 pCO2 after nutrient addition (day 14). In addition, increasing pCO2 enhanced the leucine to thymidine (Leu : TdR) ratio at the end of experiment, suggesting that pCO2 may alter the growth balance of bacteria. Stepwise multiple regression analysis suggests that multiple factors, including pCO2, 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 pCO2 was observed for BR, bacterial carbon demand and bacterial growth efficiency. Overall, the results suggest that changes in pCO2 potentially influence bacterial production, growth rate and growth balance rather than the conversion of dissolved organic matter into CO2. |
format |
Article in Journal/Newspaper |
author |
Motegi, C. Tanaka, T. Piontek, Judith Brussaard, C. P. D. Gattuso, J.-P. Weinbauer, M. G. |
spellingShingle |
Motegi, C. Tanaka, T. Piontek, Judith 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, Judith 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 |
publisher |
Copernicus Publications (EGU) |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/21532/ https://oceanrep.geomar.de/id/eprint/21532/1/bg-10-3285-2013.pdf https://doi.org/10.5194/bg-10-3285-2013 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Arctic Kongsfjord* Kongsfjorden Svalbard |
genre_facet |
Arctic Arctic Kongsfjord* Kongsfjorden Svalbard |
op_relation |
https://oceanrep.geomar.de/id/eprint/21532/1/bg-10-3285-2013.pdf Motegi, C., Tanaka, T., Piontek, J. , Brussaard, C. P. D., Gattuso, J. P. and Weinbauer, M. G. (2013) Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord. Open Access Biogeosciences (BG), 10 (5). pp. 3285-3296. DOI 10.5194/bg-10-3285-2013 <https://doi.org/10.5194/bg-10-3285-2013>. doi:10.5194/bg-10-3285-2013 |
op_rights |
cc_by 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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1766300753099489280 |