Effect of increased pCO 2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord
International audience The effect of ocean acidification on the balance between gross community production (GCP) and community respiration (CR) (i.e., net community production, NCP) of plankton communities was investigated in summer 2010 in Kongsfjorden, west of Svalbard. Surface water, which was ch...
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ftsorbonneuniv:oai:HAL:hal-04110594v1 2023-06-18T03:39:41+02:00 Effect of increased pCO 2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord Tanaka, T. Alliouane, S. Bellerby, R. G. B. Czerny, J. de Kluijver, A. Riebesell, U. Schulz, K. G. Silyakova, A. Gattuso, J. -P. 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-04110594 https://doi.org/10.5194/bg-10-315-201310.5194/bgd-9-11013-2012 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-315-201310.5194/bgd-9-11013-2012 hal-04110594 https://hal.science/hal-04110594 BIBCODE: 2013BGeo.10.315T doi:10.5194/bg-10-315-201310.5194/bgd-9-11013-2012 Biogeosciences https://hal.science/hal-04110594 Biogeosciences, 2013, 10, pp.315-325. ⟨10.5194/bg-10-315-201310.5194/bgd-9-11013-2012⟩ Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2013 ftsorbonneuniv https://doi.org/10.5194/bg-10-315-201310.5194/bgd-9-11013-2012 2023-06-06T22:49:43Z International audience The effect of ocean acidification on the balance between gross community production (GCP) and community respiration (CR) (i.e., net community production, NCP) of plankton communities was investigated in summer 2010 in Kongsfjorden, west of Svalbard. Surface water, which was characterized by low concentrations of dissolved inorganic nutrients and chlorophyll a (a proxy of phytoplankton biomass), was enclosed in nine mesocosms and subjected to eight pCO 2 levels (two replicated controls and seven enhanced pCO 2 treatments) for one month. Nutrients were added to all mesocosms on day 13 of the experiment, and thereafter increase of chlorophyll a was provoked in all mesocosms. No clear trend in response to increasing pCO 2 was found in the daily values of NCP, CR, and GCP. For further analysis, these parameters were cumulated for the following three periods: phase 1 - end of CO 2 manipulation until nutrient addition (t4 to t13); phase 2 - nutrient addition until the second chlorophyll a minimum (t14 to t21); phase 3 - the second chlorophyll a minimum until the end of this study (t22 to t28). A significant response was detected as a decrease of NCP with increasing pCO 2 during phase 3. CR was relatively stable throughout the experiment in all mesocosms. As a result, the cumulative GCP significantly decreased with increasing pCO 2 during phase 3. After the nutrient addition, the ratios of cumulative NCP to cumulative consumption of NO 3 and PO 4 showed a significant decrease during phase 3 with increasing pCO 2 . The results suggest that elevated pCO 2 influenced cumulative NCP and stoichiometric C and nutrient coupling of the plankton community in a high-latitude fjord only for a limited period. However provided that there were some differences or weak correlations between NCP data based on different methods in the same experiment, this conclusion should be taken with caution. Article in Journal/Newspaper Arctic Kongsfjord* Kongsfjorden Ocean acidification Phytoplankton 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] Tanaka, T. Alliouane, S. Bellerby, R. G. B. Czerny, J. de Kluijver, A. Riebesell, U. Schulz, K. G. Silyakova, A. Gattuso, J. -P. Effect of increased pCO 2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord |
topic_facet |
Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience The effect of ocean acidification on the balance between gross community production (GCP) and community respiration (CR) (i.e., net community production, NCP) of plankton communities was investigated in summer 2010 in Kongsfjorden, west of Svalbard. Surface water, which was characterized by low concentrations of dissolved inorganic nutrients and chlorophyll a (a proxy of phytoplankton biomass), was enclosed in nine mesocosms and subjected to eight pCO 2 levels (two replicated controls and seven enhanced pCO 2 treatments) for one month. Nutrients were added to all mesocosms on day 13 of the experiment, and thereafter increase of chlorophyll a was provoked in all mesocosms. No clear trend in response to increasing pCO 2 was found in the daily values of NCP, CR, and GCP. For further analysis, these parameters were cumulated for the following three periods: phase 1 - end of CO 2 manipulation until nutrient addition (t4 to t13); phase 2 - nutrient addition until the second chlorophyll a minimum (t14 to t21); phase 3 - the second chlorophyll a minimum until the end of this study (t22 to t28). A significant response was detected as a decrease of NCP with increasing pCO 2 during phase 3. CR was relatively stable throughout the experiment in all mesocosms. As a result, the cumulative GCP significantly decreased with increasing pCO 2 during phase 3. After the nutrient addition, the ratios of cumulative NCP to cumulative consumption of NO 3 and PO 4 showed a significant decrease during phase 3 with increasing pCO 2 . The results suggest that elevated pCO 2 influenced cumulative NCP and stoichiometric C and nutrient coupling of the plankton community in a high-latitude fjord only for a limited period. However provided that there were some differences or weak correlations between NCP data based on different methods in the same experiment, this conclusion should be taken with caution. |
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 |
Tanaka, T. Alliouane, S. Bellerby, R. G. B. Czerny, J. de Kluijver, A. Riebesell, U. Schulz, K. G. Silyakova, A. Gattuso, J. -P. |
author_facet |
Tanaka, T. Alliouane, S. Bellerby, R. G. B. Czerny, J. de Kluijver, A. Riebesell, U. Schulz, K. G. Silyakova, A. Gattuso, J. -P. |
author_sort |
Tanaka, T. |
title |
Effect of increased pCO 2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord |
title_short |
Effect of increased pCO 2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord |
title_full |
Effect of increased pCO 2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord |
title_fullStr |
Effect of increased pCO 2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord |
title_full_unstemmed |
Effect of increased pCO 2 on the planktonic metabolic balance during a mesocosm experiment in an Arctic fjord |
title_sort |
effect of increased pco 2 on the planktonic metabolic balance during a mesocosm experiment in an arctic fjord |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-04110594 https://doi.org/10.5194/bg-10-315-201310.5194/bgd-9-11013-2012 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Kongsfjord* Kongsfjorden Ocean acidification Phytoplankton Svalbard |
genre_facet |
Arctic Kongsfjord* Kongsfjorden Ocean acidification Phytoplankton Svalbard |
op_source |
Biogeosciences https://hal.science/hal-04110594 Biogeosciences, 2013, 10, pp.315-325. ⟨10.5194/bg-10-315-201310.5194/bgd-9-11013-2012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-315-201310.5194/bgd-9-11013-2012 hal-04110594 https://hal.science/hal-04110594 BIBCODE: 2013BGeo.10.315T doi:10.5194/bg-10-315-201310.5194/bgd-9-11013-2012 |
op_doi |
https://doi.org/10.5194/bg-10-315-201310.5194/bgd-9-11013-2012 |
_version_ |
1769004397328596992 |