Microbial associates of an endemic Mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification
International audience Seagrasses are important primary producers in oceans worldwide. They live in shallow coastal waters that are experiencing carbon dioxide enrichment and ocean acidification. Posidonia oceanica, an endemic seagrass species that dominates the Mediterranean Sea, achieves high abun...
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ftsorbonneuniv:oai:HAL:hal-04281106v1 2024-05-12T08:09:18+00:00 Microbial associates of an endemic Mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification Pfister, A.C. Cardini, U. Mirasole, A. Montilla, L. Veseli, I. Gattuso, Jean-Pierre Teixido, Nuria 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) Institut du Développement Durable et des Relations Internationales (IDDRI) Institut d'Études Politiques IEP - Paris 2023 https://hal.science/hal-04281106 https://hal.science/hal-04281106/document https://hal.science/hal-04281106/file/Pfister_etal_sbm_Scientific%20Reports.pdf en eng HAL CCSD Nature Publishing Group hal-04281106 https://hal.science/hal-04281106 https://hal.science/hal-04281106/document https://hal.science/hal-04281106/file/Pfister_etal_sbm_Scientific%20Reports.pdf info:eu-repo/semantics/OpenAccess ISSN: 2045-2322 EISSN: 2045-2322 Scientific Reports https://hal.science/hal-04281106 Scientific Reports, In press [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2023 ftsorbonneuniv 2024-04-18T03:23:31Z International audience Seagrasses are important primary producers in oceans worldwide. They live in shallow coastal waters that are experiencing carbon dioxide enrichment and ocean acidification. Posidonia oceanica, an endemic seagrass species that dominates the Mediterranean Sea, achieves high abundances in seawater with relatively low concentrations of dissolved inorganic nitrogen. Here we test whether microbial metabolisms associated with P. oceanica and surrounding seawater enhance seagrass access to nitrogen. Using stable isotope enrichments of intact seagrass with amino acids, we show that ammonification by free-living and seagrass-associated microbes produce ammonium that is likely used by seagrass and surrounding particulate organic matter. Metagenomic analysis of the epiphytic biofilm on the blades and rhizomes support the ubiquity of microbial ammonification genes in this system. Further, we leveraged the presence of natural 2 carbon dioxide vents and show that microbial ammonification was reduced at lower pH. The presence of P. oceanica enhanced the uptake of nitrogen by water column particulate organic matter, increasing carbon fixation by a factor of 8.6 to 17.4 with the greatest effect at CO2 vent sites. Seagrass and its microbial associates thus enhanced water column productivity and were a locus for nutrient cycling. Article in Journal/Newspaper Ocean acidification HAL Sorbonne Université |
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English |
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[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Pfister, A.C. Cardini, U. Mirasole, A. Montilla, L. Veseli, I. Gattuso, Jean-Pierre Teixido, Nuria Microbial associates of an endemic Mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Seagrasses are important primary producers in oceans worldwide. They live in shallow coastal waters that are experiencing carbon dioxide enrichment and ocean acidification. Posidonia oceanica, an endemic seagrass species that dominates the Mediterranean Sea, achieves high abundances in seawater with relatively low concentrations of dissolved inorganic nitrogen. Here we test whether microbial metabolisms associated with P. oceanica and surrounding seawater enhance seagrass access to nitrogen. Using stable isotope enrichments of intact seagrass with amino acids, we show that ammonification by free-living and seagrass-associated microbes produce ammonium that is likely used by seagrass and surrounding particulate organic matter. Metagenomic analysis of the epiphytic biofilm on the blades and rhizomes support the ubiquity of microbial ammonification genes in this system. Further, we leveraged the presence of natural 2 carbon dioxide vents and show that microbial ammonification was reduced at lower pH. The presence of P. oceanica enhanced the uptake of nitrogen by water column particulate organic matter, increasing carbon fixation by a factor of 8.6 to 17.4 with the greatest effect at CO2 vent sites. Seagrass and its microbial associates thus enhanced water column productivity and were a locus for nutrient cycling. |
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) Institut du Développement Durable et des Relations Internationales (IDDRI) Institut d'Études Politiques IEP - Paris |
format |
Article in Journal/Newspaper |
author |
Pfister, A.C. Cardini, U. Mirasole, A. Montilla, L. Veseli, I. Gattuso, Jean-Pierre Teixido, Nuria |
author_facet |
Pfister, A.C. Cardini, U. Mirasole, A. Montilla, L. Veseli, I. Gattuso, Jean-Pierre Teixido, Nuria |
author_sort |
Pfister, A.C. |
title |
Microbial associates of an endemic Mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification |
title_short |
Microbial associates of an endemic Mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification |
title_full |
Microbial associates of an endemic Mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification |
title_fullStr |
Microbial associates of an endemic Mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification |
title_full_unstemmed |
Microbial associates of an endemic Mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification |
title_sort |
microbial associates of an endemic mediterranean seagrass enhance the access of the host and the surrounding seawater to inorganic nitrogen under ocean acidification |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04281106 https://hal.science/hal-04281106/document https://hal.science/hal-04281106/file/Pfister_etal_sbm_Scientific%20Reports.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ISSN: 2045-2322 EISSN: 2045-2322 Scientific Reports https://hal.science/hal-04281106 Scientific Reports, In press |
op_relation |
hal-04281106 https://hal.science/hal-04281106 https://hal.science/hal-04281106/document https://hal.science/hal-04281106/file/Pfister_etal_sbm_Scientific%20Reports.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1798852514889596928 |