Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord
International audience Net community production (NCP) and carbon to nutrient uptake ratios were studied during a large-scale mesocosm experiment on ocean acidification in Kongsfjorden, western Svalbard, during June-July 2010. Nutrient depleted fjord water with natural plankton assemblages, enclosed...
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ftsorbonneuniv:oai:HAL:hal-04110582v1 2023-06-18T03:39:40+02:00 Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord Silyakova, A. Bellerby, R. G. J. Schulz, K. G. Czerny, J. Tanaka, T. Nondal, G. Riebesell, U. Engel, A. de Lange, T. Ludvig, A. 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-04110582 https://doi.org/10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012 hal-04110582 https://hal.science/hal-04110582 BIBCODE: 2013BGeo.10.4847S doi:10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012 Biogeosciences https://hal.science/hal-04110582 Biogeosciences, 2013, 10, pp.4847-4859. ⟨10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012⟩ Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2013 ftsorbonneuniv https://doi.org/10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012 2023-06-06T22:49:43Z International audience Net community production (NCP) and carbon to nutrient uptake ratios were studied during a large-scale mesocosm experiment on ocean acidification in Kongsfjorden, western Svalbard, during June-July 2010. Nutrient depleted fjord water with natural plankton assemblages, enclosed in nine mesocosms of ~ 50 m 3 in volume, was exposed to pCO 2 levels ranging initially from 185 to 1420 μatm. NCP estimations are the cumulative change in dissolved inorganic carbon concentrations after accounting for gas exchange and total alkalinity variations. Stoichiometric coupling between inorganic carbon and nutrient net uptake is shown as a ratio of NCP to a cumulative change in inorganic nutrients. Phytoplankton growth was stimulated by nutrient addition half way through the experiment and three distinct peaks in chlorophyll a concentration were observed during the experiment. Accordingly, the experiment was divided in three phases. Cumulative NCP was similar in all mesocosms over the duration of the experiment. However, in phases I and II, NCP was higher and in phase III lower at elevated pCO 2 . Due to relatively low inorganic nutrient concentration in phase I, C : N and C : P uptake ratios were calculated only for the period after nutrient addition (phase II and phase III). For the total post-nutrient period (phase II + phase III) ratios were close to Redfield, however they were lower in phase II and higher in phase III. Variability of NCP, C : N and C : P uptake ratios in different phases reflects the effect of increasing CO 2 on phytoplankton community composition and succession. The phytoplankton community was composed predominantly of haptophytes in phase I, prasinophytes, dinoflagellates, and cryptophytes in phase II, and haptophytes, prasinophytes, dinoflagellates and chlorophytes in phase III (Schulz et al., 2013). Increasing ambient inorganic carbon concentrations have also been shown to promote primary production and carbon assimilation. For this study, it is clear that the pelagic ecosystem ... 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] Silyakova, A. Bellerby, R. G. J. Schulz, K. G. Czerny, J. Tanaka, T. Nondal, G. Riebesell, U. Engel, A. de Lange, T. Ludvig, A. Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord |
topic_facet |
Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience Net community production (NCP) and carbon to nutrient uptake ratios were studied during a large-scale mesocosm experiment on ocean acidification in Kongsfjorden, western Svalbard, during June-July 2010. Nutrient depleted fjord water with natural plankton assemblages, enclosed in nine mesocosms of ~ 50 m 3 in volume, was exposed to pCO 2 levels ranging initially from 185 to 1420 μatm. NCP estimations are the cumulative change in dissolved inorganic carbon concentrations after accounting for gas exchange and total alkalinity variations. Stoichiometric coupling between inorganic carbon and nutrient net uptake is shown as a ratio of NCP to a cumulative change in inorganic nutrients. Phytoplankton growth was stimulated by nutrient addition half way through the experiment and three distinct peaks in chlorophyll a concentration were observed during the experiment. Accordingly, the experiment was divided in three phases. Cumulative NCP was similar in all mesocosms over the duration of the experiment. However, in phases I and II, NCP was higher and in phase III lower at elevated pCO 2 . Due to relatively low inorganic nutrient concentration in phase I, C : N and C : P uptake ratios were calculated only for the period after nutrient addition (phase II and phase III). For the total post-nutrient period (phase II + phase III) ratios were close to Redfield, however they were lower in phase II and higher in phase III. Variability of NCP, C : N and C : P uptake ratios in different phases reflects the effect of increasing CO 2 on phytoplankton community composition and succession. The phytoplankton community was composed predominantly of haptophytes in phase I, prasinophytes, dinoflagellates, and cryptophytes in phase II, and haptophytes, prasinophytes, dinoflagellates and chlorophytes in phase III (Schulz et al., 2013). Increasing ambient inorganic carbon concentrations have also been shown to promote primary production and carbon assimilation. For this study, it is clear that the pelagic ecosystem ... |
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 |
Silyakova, A. Bellerby, R. G. J. Schulz, K. G. Czerny, J. Tanaka, T. Nondal, G. Riebesell, U. Engel, A. de Lange, T. Ludvig, A. |
author_facet |
Silyakova, A. Bellerby, R. G. J. Schulz, K. G. Czerny, J. Tanaka, T. Nondal, G. Riebesell, U. Engel, A. de Lange, T. Ludvig, A. |
author_sort |
Silyakova, A. |
title |
Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord |
title_short |
Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord |
title_full |
Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord |
title_fullStr |
Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord |
title_full_unstemmed |
Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord |
title_sort |
pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an arctic fjord |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-04110582 https://doi.org/10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012 |
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-04110582 Biogeosciences, 2013, 10, pp.4847-4859. ⟨10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012 hal-04110582 https://hal.science/hal-04110582 BIBCODE: 2013BGeo.10.4847S doi:10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012 |
op_doi |
https://doi.org/10.5194/bg-10-4847-201310.5194/bgd-9-11705-2012 |
_version_ |
1769004376251170816 |