Effect of CO 2 enrichment on bacterial metabolism in an Arctic fjord
International audience 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 (pCO 2 ). Although bacteria play a major role in carbon cycling, little is known about the impact of rising pCO 2...
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ftsorbonneuniv:oai:HAL:hal-04110587v1 2023-06-18T03:39:41+02:00 Effect of CO 2 enrichment on bacterial metabolism in an Arctic fjord Motegi, C. Tanaka, T. Piontek, J. Brussaard, C. P. D. Gattuso, J. -P. Weinbauer, M. G. Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal.science/hal-04110587 https://doi.org/10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012 hal-04110587 https://hal.science/hal-04110587 BIBCODE: 2013BGeo.10.3285M doi:10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012 Biogeosciences https://hal.science/hal-04110587 Biogeosciences, 2013, 10, pp.3285-3296. ⟨10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012⟩ Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2013 ftsorbonneuniv https://doi.org/10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012 2023-06-06T22:49:43Z International audience 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 (pCO 2 ). Although bacteria play a major role in carbon cycling, little is known about the impact of rising pCO 2 on bacterial carbon metabolism, especially for natural bacterial communities. In this study, we investigated the effect of rising pCO 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 pCO 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 pCO 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 pCO 2 after nutrient addition (day 14). In addition, increasing pCO 2 enhanced the leucine to thymidine (Leu : TdR) ratio at the end of experiment, suggesting that pCO 2 may alter the growth balance of bacteria. Stepwise multiple regression analysis suggests that multiple factors, including pCO 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 pCO 2 was observed for BR, bacterial carbon demand and bacterial growth efficiency. Overall, the results suggest that changes in pCO 2 potentially influence bacterial production, growth rate and growth balance rather than the conversion of dissolved organic matter into CO 2 . Article in Journal/Newspaper Arctic Kongsfjord* Kongsfjorden Svalbard HAL Sorbonne Université Arctic Svalbard |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
Earth Science [SDU]Sciences of the Universe [physics] Motegi, C. Tanaka, T. Piontek, J. Brussaard, C. P. D. Gattuso, J. -P. Weinbauer, M. G. Effect of CO 2 enrichment on bacterial metabolism in an Arctic fjord |
topic_facet |
Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience 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 (pCO 2 ). Although bacteria play a major role in carbon cycling, little is known about the impact of rising pCO 2 on bacterial carbon metabolism, especially for natural bacterial communities. In this study, we investigated the effect of rising pCO 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 pCO 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 pCO 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 pCO 2 after nutrient addition (day 14). In addition, increasing pCO 2 enhanced the leucine to thymidine (Leu : TdR) ratio at the end of experiment, suggesting that pCO 2 may alter the growth balance of bacteria. Stepwise multiple regression analysis suggests that multiple factors, including pCO 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 pCO 2 was observed for BR, bacterial carbon demand and bacterial growth efficiency. Overall, the results suggest that changes in pCO 2 potentially influence bacterial production, growth rate and growth balance rather than the conversion of dissolved organic matter into CO 2 . |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Motegi, C. Tanaka, T. Piontek, J. Brussaard, C. P. D. Gattuso, J. -P. Weinbauer, M. G. |
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 CO 2 enrichment on bacterial metabolism in an Arctic fjord |
title_short |
Effect of CO 2 enrichment on bacterial metabolism in an Arctic fjord |
title_full |
Effect of CO 2 enrichment on bacterial metabolism in an Arctic fjord |
title_fullStr |
Effect of CO 2 enrichment on bacterial metabolism in an Arctic fjord |
title_full_unstemmed |
Effect of CO 2 enrichment on bacterial metabolism in an Arctic fjord |
title_sort |
effect of co 2 enrichment on bacterial metabolism in an arctic fjord |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-04110587 https://doi.org/10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Kongsfjord* Kongsfjorden Svalbard |
genre_facet |
Arctic Kongsfjord* Kongsfjorden Svalbard |
op_source |
Biogeosciences https://hal.science/hal-04110587 Biogeosciences, 2013, 10, pp.3285-3296. ⟨10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012 hal-04110587 https://hal.science/hal-04110587 BIBCODE: 2013BGeo.10.3285M doi:10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012 |
op_doi |
https://doi.org/10.5194/bg-10-3285-201310.5194/bgd-9-15213-2012 |
_version_ |
1769004402925895680 |