The differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon
Seagrass meadows are one of the most productive ecosystems on the planet, but their photosynthesis rate may be limited by carbon dioxide but mitigated by exploiting the high concentration of bicarbonate in the ocean using different active processes. Seagrasses are declining worldwide at an accelerat...
Published in: | Frontiers in Plant Science |
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Language: | English |
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Frontiers Media SA
2022
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Online Access: | https://archimer.ifremer.fr/doc/00908/101965/113120.pdf https://archimer.ifremer.fr/doc/00908/101965/113121.pdf https://doi.org/10.3389/fpls.2022.936716 https://archimer.ifremer.fr/doc/00908/101965/ |
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ftarchimer:oai:archimer.ifremer.fr:101965 2024-09-30T14:40:51+00:00 The differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon Maberly, Stephen Christopher Stott, Andrew w. Gontero, Brigitte 2022-09-29 application/pdf https://archimer.ifremer.fr/doc/00908/101965/113120.pdf https://archimer.ifremer.fr/doc/00908/101965/113121.pdf https://doi.org/10.3389/fpls.2022.936716 https://archimer.ifremer.fr/doc/00908/101965/ eng eng Frontiers Media SA https://archimer.ifremer.fr/doc/00908/101965/113120.pdf https://archimer.ifremer.fr/doc/00908/101965/113121.pdf doi:10.3389/fpls.2022.936716 https://archimer.ifremer.fr/doc/00908/101965/ info:eu-repo/semantics/openAccess restricted use Frontiers in Plant Science (1664-462X) (Frontiers Media SA), 2022-09-29 , Vol. 13 , P. 936716 (14p.) climate change CO2 concentrating mechanisms (CCMs) ocean acidification Posidonia oceanica rising CO2 seagrass Zostera marina text Article info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.3389/fpls.2022.936716 2024-09-18T00:09:41Z Seagrass meadows are one of the most productive ecosystems on the planet, but their photosynthesis rate may be limited by carbon dioxide but mitigated by exploiting the high concentration of bicarbonate in the ocean using different active processes. Seagrasses are declining worldwide at an accelerating rate because of numerous anthropogenic pressures. However, rising ocean concentrations of dissolved inorganic carbon, caused by increases in atmospheric carbon dioxide, may benefit seagrass photosynthesis. Here we compare the ability of two seagrass from the Mediterranean Sea, Posidonia oceanica (L.) Delile and Zostera marina L., to use carbon dioxide and bicarbonate at light saturation, and model how increasing concentrations of inorganic carbon affect their photosynthesis rate. pH-drift measurements confirmed that both species were able to use bicarbonate in addition to carbon dioxide, but that Z. marina was more effective than P. oceanica. Kinetic experiments showed that, compared to Z. marina, P. oceanica had a seven-fold higher affinity for carbon dioxide and a 1.6-fold higher affinity for bicarbonate. However, the maximal rate of bicarbonate uptake in Z. marina was 2.1-fold higher than in P. oceanica. In equilibrium with 410 ppm carbon dioxide in the atmosphere, the modelled rates of photosynthesis by Z. marina were slightly higher than P. oceanica, less carbon limited and depended on bicarbonate to a greater extent. This greater reliance by Z. marina is consistent with its less depleted 13C content compared to P. oceanica. Modelled photosynthesis suggests that both species would depend on bicarbonate alone at an atmospheric carbon dioxide partial pressure of 280 ppm. P. oceanica was projected to benefit more than Z. marina with increasing atmospheric carbon dioxide partial pressures, and at the highest carbon dioxide scenario of 1135 ppm, would have higher rates of photosynthesis and be more saturated by inorganic carbon than Z. marina. In both species, the proportional reliance on bicarbonate declined ... Article in Journal/Newspaper Ocean acidification Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Frontiers in Plant Science 13 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
climate change CO2 concentrating mechanisms (CCMs) ocean acidification Posidonia oceanica rising CO2 seagrass Zostera marina |
spellingShingle |
climate change CO2 concentrating mechanisms (CCMs) ocean acidification Posidonia oceanica rising CO2 seagrass Zostera marina Maberly, Stephen Christopher Stott, Andrew w. Gontero, Brigitte The differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon |
topic_facet |
climate change CO2 concentrating mechanisms (CCMs) ocean acidification Posidonia oceanica rising CO2 seagrass Zostera marina |
description |
Seagrass meadows are one of the most productive ecosystems on the planet, but their photosynthesis rate may be limited by carbon dioxide but mitigated by exploiting the high concentration of bicarbonate in the ocean using different active processes. Seagrasses are declining worldwide at an accelerating rate because of numerous anthropogenic pressures. However, rising ocean concentrations of dissolved inorganic carbon, caused by increases in atmospheric carbon dioxide, may benefit seagrass photosynthesis. Here we compare the ability of two seagrass from the Mediterranean Sea, Posidonia oceanica (L.) Delile and Zostera marina L., to use carbon dioxide and bicarbonate at light saturation, and model how increasing concentrations of inorganic carbon affect their photosynthesis rate. pH-drift measurements confirmed that both species were able to use bicarbonate in addition to carbon dioxide, but that Z. marina was more effective than P. oceanica. Kinetic experiments showed that, compared to Z. marina, P. oceanica had a seven-fold higher affinity for carbon dioxide and a 1.6-fold higher affinity for bicarbonate. However, the maximal rate of bicarbonate uptake in Z. marina was 2.1-fold higher than in P. oceanica. In equilibrium with 410 ppm carbon dioxide in the atmosphere, the modelled rates of photosynthesis by Z. marina were slightly higher than P. oceanica, less carbon limited and depended on bicarbonate to a greater extent. This greater reliance by Z. marina is consistent with its less depleted 13C content compared to P. oceanica. Modelled photosynthesis suggests that both species would depend on bicarbonate alone at an atmospheric carbon dioxide partial pressure of 280 ppm. P. oceanica was projected to benefit more than Z. marina with increasing atmospheric carbon dioxide partial pressures, and at the highest carbon dioxide scenario of 1135 ppm, would have higher rates of photosynthesis and be more saturated by inorganic carbon than Z. marina. In both species, the proportional reliance on bicarbonate declined ... |
format |
Article in Journal/Newspaper |
author |
Maberly, Stephen Christopher Stott, Andrew w. Gontero, Brigitte |
author_facet |
Maberly, Stephen Christopher Stott, Andrew w. Gontero, Brigitte |
author_sort |
Maberly, Stephen Christopher |
title |
The differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon |
title_short |
The differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon |
title_full |
The differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon |
title_fullStr |
The differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon |
title_full_unstemmed |
The differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon |
title_sort |
differential ability of two species of seagrass to use carbon dioxide and bicarbonate and their modelled response to rising concentrations of inorganic carbon |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00908/101965/113120.pdf https://archimer.ifremer.fr/doc/00908/101965/113121.pdf https://doi.org/10.3389/fpls.2022.936716 https://archimer.ifremer.fr/doc/00908/101965/ |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Frontiers in Plant Science (1664-462X) (Frontiers Media SA), 2022-09-29 , Vol. 13 , P. 936716 (14p.) |
op_relation |
https://archimer.ifremer.fr/doc/00908/101965/113120.pdf https://archimer.ifremer.fr/doc/00908/101965/113121.pdf doi:10.3389/fpls.2022.936716 https://archimer.ifremer.fr/doc/00908/101965/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.3389/fpls.2022.936716 |
container_title |
Frontiers in Plant Science |
container_volume |
13 |
_version_ |
1811643325342547968 |