Effects of in situ CO 2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica
International audience Seagrass is expected to benefit from increased carbon availability under future ocean acidification. This hypothesis has been little tested by in situ manipulation. To test for ocean acidification effects on seagrass meadows under controlled CO2/pH conditions, we used a Free O...
Published in: | Biogeosciences |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-01301983 https://hal.sorbonne-universite.fr/hal-01301983/document https://hal.sorbonne-universite.fr/hal-01301983/file/bg-13-2179-2016.pdf https://doi.org/10.5194/bg-13-2179-2016 |
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English |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Cox, T. Erin Gazeau, Frédéric Alliouane, Samir Hendriks, Iris, E. Mahacek, Paul Le Fur, Arnaud Gattuso, Jean-Pierre Effects of in situ CO 2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Seagrass is expected to benefit from increased carbon availability under future ocean acidification. This hypothesis has been little tested by in situ manipulation. To test for ocean acidification effects on seagrass meadows under controlled CO2/pH conditions, we used a Free Ocean Carbon Dioxide Enrichment (FOCE) system which allows for the manipulation of pH as continuous offset from ambient. It was deployed in a Posidonia oceanica meadow at 11 m depth in the Northwestern Mediterranean Sea. It consisted of two benthic enclosures, an experimental and a control unit both 1.7 m3, and an additional reference plot in the ambient environment (2 m2) to account for structural artifacts. The meadow was monitored from April to November 2014. The pH of the experimental enclosure was lowered by 0.26 pH units for the second half of the 8-month study. The greatest magnitude of change in P. oceanica leaf biometrics, photosynthesis, and leaf growth accompanied seasonal changes recorded in the environment and values were similar between the two enclosures. Leaf thickness may change in response to lower pH but this requires further testing. Results are congruent with other short-term and natural studies that have investigated the response of P. oceanica over a wide range of pH. They suggest any benefit from ocean acidification, over the next century (at a pH of ∼ 7.7 on the total scale), on Posidonia physiology and growth may be minimal and difficult to detect without increased replication or longer experimental duration. The limited stimulation, which did not surpass any enclosure or seasonal effect, casts doubts on speculations that elevated CO2 would confer resistance to thermal stress and increase the buffering capacity of meadows. |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut Mediterrani d'Estudis Avancats (IMEDEA) Consejo Superior de Investigaciones Cientificas España = Spanish National Research Council Spain (CSIC)-Universitat de les Illes Balears = Universidad de las Islas Baleares = University of the Balearic Islands (UIB) Institut du Développement Durable et des Relations Internationales (IDDRI) Institut d'Études Politiques IEP - Paris European Project: 265103,EC:FP7:ENV,FP7-ENV-2010,MEDSEA(2011) |
format |
Article in Journal/Newspaper |
author |
Cox, T. Erin Gazeau, Frédéric Alliouane, Samir Hendriks, Iris, E. Mahacek, Paul Le Fur, Arnaud Gattuso, Jean-Pierre |
author_facet |
Cox, T. Erin Gazeau, Frédéric Alliouane, Samir Hendriks, Iris, E. Mahacek, Paul Le Fur, Arnaud Gattuso, Jean-Pierre |
author_sort |
Cox, T. Erin |
title |
Effects of in situ CO 2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica |
title_short |
Effects of in situ CO 2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica |
title_full |
Effects of in situ CO 2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica |
title_fullStr |
Effects of in situ CO 2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica |
title_full_unstemmed |
Effects of in situ CO 2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica |
title_sort |
effects of in situ co 2 enrichment on structural characteristics, photosynthesis, and growth of the mediterranean seagrass posidonia oceanica |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.sorbonne-universite.fr/hal-01301983 https://hal.sorbonne-universite.fr/hal-01301983/document https://hal.sorbonne-universite.fr/hal-01301983/file/bg-13-2179-2016.pdf https://doi.org/10.5194/bg-13-2179-2016 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.sorbonne-universite.fr/hal-01301983 Biogeosciences, 2016, 13, pp.2179-2194. ⟨10.5194/bg-13-2179-2016⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-13-2179-2016 info:eu-repo/grantAgreement/EC/FP7/265103/EU/MEDiterranean Sea Acidification in a changing climate/MEDSEA hal-01301983 https://hal.sorbonne-universite.fr/hal-01301983 https://hal.sorbonne-universite.fr/hal-01301983/document https://hal.sorbonne-universite.fr/hal-01301983/file/bg-13-2179-2016.pdf doi:10.5194/bg-13-2179-2016 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-13-2179-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
7 |
container_start_page |
2179 |
op_container_end_page |
2194 |
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ftsorbonneuniv:oai:HAL:hal-01301983v1 2024-05-12T08:09:17+00:00 Effects of in situ CO 2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica Cox, T. Erin Gazeau, Frédéric Alliouane, Samir Hendriks, Iris, E. Mahacek, Paul Le Fur, Arnaud Gattuso, Jean-Pierre Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut Mediterrani d'Estudis Avancats (IMEDEA) Consejo Superior de Investigaciones Cientificas España = Spanish National Research Council Spain (CSIC)-Universitat de les Illes Balears = Universidad de las Islas Baleares = University of the Balearic Islands (UIB) Institut du Développement Durable et des Relations Internationales (IDDRI) Institut d'Études Politiques IEP - Paris European Project: 265103,EC:FP7:ENV,FP7-ENV-2010,MEDSEA(2011) 2016 https://hal.sorbonne-universite.fr/hal-01301983 https://hal.sorbonne-universite.fr/hal-01301983/document https://hal.sorbonne-universite.fr/hal-01301983/file/bg-13-2179-2016.pdf https://doi.org/10.5194/bg-13-2179-2016 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-13-2179-2016 info:eu-repo/grantAgreement/EC/FP7/265103/EU/MEDiterranean Sea Acidification in a changing climate/MEDSEA hal-01301983 https://hal.sorbonne-universite.fr/hal-01301983 https://hal.sorbonne-universite.fr/hal-01301983/document https://hal.sorbonne-universite.fr/hal-01301983/file/bg-13-2179-2016.pdf doi:10.5194/bg-13-2179-2016 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.sorbonne-universite.fr/hal-01301983 Biogeosciences, 2016, 13, pp.2179-2194. ⟨10.5194/bg-13-2179-2016⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2016 ftsorbonneuniv https://doi.org/10.5194/bg-13-2179-2016 2024-04-18T03:52:28Z International audience Seagrass is expected to benefit from increased carbon availability under future ocean acidification. This hypothesis has been little tested by in situ manipulation. To test for ocean acidification effects on seagrass meadows under controlled CO2/pH conditions, we used a Free Ocean Carbon Dioxide Enrichment (FOCE) system which allows for the manipulation of pH as continuous offset from ambient. It was deployed in a Posidonia oceanica meadow at 11 m depth in the Northwestern Mediterranean Sea. It consisted of two benthic enclosures, an experimental and a control unit both 1.7 m3, and an additional reference plot in the ambient environment (2 m2) to account for structural artifacts. The meadow was monitored from April to November 2014. The pH of the experimental enclosure was lowered by 0.26 pH units for the second half of the 8-month study. The greatest magnitude of change in P. oceanica leaf biometrics, photosynthesis, and leaf growth accompanied seasonal changes recorded in the environment and values were similar between the two enclosures. Leaf thickness may change in response to lower pH but this requires further testing. Results are congruent with other short-term and natural studies that have investigated the response of P. oceanica over a wide range of pH. They suggest any benefit from ocean acidification, over the next century (at a pH of ∼ 7.7 on the total scale), on Posidonia physiology and growth may be minimal and difficult to detect without increased replication or longer experimental duration. The limited stimulation, which did not surpass any enclosure or seasonal effect, casts doubts on speculations that elevated CO2 would confer resistance to thermal stress and increase the buffering capacity of meadows. Article in Journal/Newspaper Ocean acidification HAL Sorbonne Université Biogeosciences 13 7 2179 2194 |