No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community
Nitrogen fixation by filamentous cyanobacteria supplies significant amounts of new nitrogen (N) to the Baltic Sea. This balances N loss processes such as denitrification and anammox, and forms an important N source supporting primary and secondary production in N-limited post-spring bloom plankton c...
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Online Access: | https://eprints.soton.ac.uk/401873/ https://eprints.soton.ac.uk/401873/1/bg-13-3901-2016.pdf https://eprints.soton.ac.uk/401873/2/bg-13-3901-2016-supplement.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:401873 2023-07-30T04:05:59+02:00 No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community Paul, Allanah J. Achterberg, Eric P. Bach, Lennart T. Boxhammer, Tim Czerny, Jan Haunost, Mathias Schulz, Kai-Georg Stuhr, Annegret Riebesell, Ulf 2016-07-07 text https://eprints.soton.ac.uk/401873/ https://eprints.soton.ac.uk/401873/1/bg-13-3901-2016.pdf https://eprints.soton.ac.uk/401873/2/bg-13-3901-2016-supplement.pdf en English eng https://eprints.soton.ac.uk/401873/1/bg-13-3901-2016.pdf https://eprints.soton.ac.uk/401873/2/bg-13-3901-2016-supplement.pdf Paul, Allanah J., Achterberg, Eric P., Bach, Lennart T., Boxhammer, Tim, Czerny, Jan, Haunost, Mathias, Schulz, Kai-Georg, Stuhr, Annegret and Riebesell, Ulf (2016) No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community. Biogeosciences, 13 (13), 3901-3913. (doi:10.5194/bg-13-3901-2016 <http://dx.doi.org/10.5194/bg-13-3901-2016>). cc_by_4 other Article PeerReviewed 2016 ftsouthampton https://doi.org/10.5194/bg-13-3901-2016 2023-07-09T22:11:22Z Nitrogen fixation by filamentous cyanobacteria supplies significant amounts of new nitrogen (N) to the Baltic Sea. This balances N loss processes such as denitrification and anammox, and forms an important N source supporting primary and secondary production in N-limited post-spring bloom plankton communities. Laboratory studies suggest that filamentous diazotrophic cyanobacteria growth and N2-fixation rates are sensitive to ocean acidification, with potential implications for new N supply to the Baltic Sea. In this study, our aim was to assess the effect of ocean acidification on diazotroph growth and activity as well as the contribution of diazotrophically fixed N to N supply in a natural plankton assemblage. We enclosed a natural plankton community in a summer season in the Baltic Sea near the entrance to the Gulf of Finland in six large-scale mesocosms (volume ??55?m3) and manipulated fCO2 over a range relevant for projected ocean acidification by the end of this century (average treatment fCO2: 365–1231?µatm). The direct response of diazotroph growth and activity was followed in the mesocosms over a 47 day study period during N-limited growth in the summer plankton community. Diazotrophic filamentous cyanobacteria abundance throughout the study period and N2-fixation rates (determined only until day 21 due to subsequent use of contaminated commercial 15N-N2 gas stocks) remained low. Thus estimated new N inputs from diazotrophy were too low to relieve N limitation and stimulate a summer phytoplankton bloom. Instead, regeneration of organic N sources likely sustained growth in the plankton community. We could not detect significant CO2-related differences in neither inorganic nor organic N pool sizes, or particulate matter N?:?P stoichiometry. Additionally, no significant effect of elevated CO2 on diazotroph activity was observed. Therefore, ocean acidification had no observable impact on N cycling or biogeochemistry in this N-limited, post-spring bloom plankton assemblage in the Baltic Sea. Article in Journal/Newspaper Ocean acidification University of Southampton: e-Prints Soton Biogeosciences 13 13 3901 3913 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Nitrogen fixation by filamentous cyanobacteria supplies significant amounts of new nitrogen (N) to the Baltic Sea. This balances N loss processes such as denitrification and anammox, and forms an important N source supporting primary and secondary production in N-limited post-spring bloom plankton communities. Laboratory studies suggest that filamentous diazotrophic cyanobacteria growth and N2-fixation rates are sensitive to ocean acidification, with potential implications for new N supply to the Baltic Sea. In this study, our aim was to assess the effect of ocean acidification on diazotroph growth and activity as well as the contribution of diazotrophically fixed N to N supply in a natural plankton assemblage. We enclosed a natural plankton community in a summer season in the Baltic Sea near the entrance to the Gulf of Finland in six large-scale mesocosms (volume ??55?m3) and manipulated fCO2 over a range relevant for projected ocean acidification by the end of this century (average treatment fCO2: 365–1231?µatm). The direct response of diazotroph growth and activity was followed in the mesocosms over a 47 day study period during N-limited growth in the summer plankton community. Diazotrophic filamentous cyanobacteria abundance throughout the study period and N2-fixation rates (determined only until day 21 due to subsequent use of contaminated commercial 15N-N2 gas stocks) remained low. Thus estimated new N inputs from diazotrophy were too low to relieve N limitation and stimulate a summer phytoplankton bloom. Instead, regeneration of organic N sources likely sustained growth in the plankton community. We could not detect significant CO2-related differences in neither inorganic nor organic N pool sizes, or particulate matter N?:?P stoichiometry. Additionally, no significant effect of elevated CO2 on diazotroph activity was observed. Therefore, ocean acidification had no observable impact on N cycling or biogeochemistry in this N-limited, post-spring bloom plankton assemblage in the Baltic Sea. |
format |
Article in Journal/Newspaper |
author |
Paul, Allanah J. Achterberg, Eric P. Bach, Lennart T. Boxhammer, Tim Czerny, Jan Haunost, Mathias Schulz, Kai-Georg Stuhr, Annegret Riebesell, Ulf |
spellingShingle |
Paul, Allanah J. Achterberg, Eric P. Bach, Lennart T. Boxhammer, Tim Czerny, Jan Haunost, Mathias Schulz, Kai-Georg Stuhr, Annegret Riebesell, Ulf No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community |
author_facet |
Paul, Allanah J. Achterberg, Eric P. Bach, Lennart T. Boxhammer, Tim Czerny, Jan Haunost, Mathias Schulz, Kai-Georg Stuhr, Annegret Riebesell, Ulf |
author_sort |
Paul, Allanah J. |
title |
No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community |
title_short |
No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community |
title_full |
No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community |
title_fullStr |
No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community |
title_full_unstemmed |
No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community |
title_sort |
no observed effect of ocean acidification on nitrogen biogeochemistry in a summer baltic sea plankton community |
publishDate |
2016 |
url |
https://eprints.soton.ac.uk/401873/ https://eprints.soton.ac.uk/401873/1/bg-13-3901-2016.pdf https://eprints.soton.ac.uk/401873/2/bg-13-3901-2016-supplement.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://eprints.soton.ac.uk/401873/1/bg-13-3901-2016.pdf https://eprints.soton.ac.uk/401873/2/bg-13-3901-2016-supplement.pdf Paul, Allanah J., Achterberg, Eric P., Bach, Lennart T., Boxhammer, Tim, Czerny, Jan, Haunost, Mathias, Schulz, Kai-Georg, Stuhr, Annegret and Riebesell, Ulf (2016) No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community. Biogeosciences, 13 (13), 3901-3913. (doi:10.5194/bg-13-3901-2016 <http://dx.doi.org/10.5194/bg-13-3901-2016>). |
op_rights |
cc_by_4 other |
op_doi |
https://doi.org/10.5194/bg-13-3901-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
13 |
container_start_page |
3901 |
op_container_end_page |
3913 |
_version_ |
1772818341635817472 |