Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics?
A broad sampling program was carried out in the spring of 2019 on the Brittany coast to assess how the surface sediment characteristics drive the benthic effluxes of ammonium ($\mathrm{NH}_{4}^{+}$) and phosphate ($\mathrm{PO}_{4}$) from intertidal mudflats. A total of 200 sediment samples were char...
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| Format: | Article |
| Language: | English |
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Académie des sciences
2021-05-01
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| Series: | Comptes Rendus. Géoscience |
| Subjects: | |
| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.57/ |
| _version_ | 1797651319310254080 |
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| author | Louis, Justine Jeanneau, Laurent Andrieux-Loyer, Françoise Gruau, Gérard Caradec, Florian Lebris, Nathalie Chorin, Marion Jardé, Emilie Rabiller, Emilie Petton, Christophe Bouger, Guillaume Petitjean, Patrice Laverman, Anniet M. |
| author_facet | Louis, Justine Jeanneau, Laurent Andrieux-Loyer, Françoise Gruau, Gérard Caradec, Florian Lebris, Nathalie Chorin, Marion Jardé, Emilie Rabiller, Emilie Petton, Christophe Bouger, Guillaume Petitjean, Patrice Laverman, Anniet M. |
| author_sort | Louis, Justine |
| collection | DOAJ |
| description | A broad sampling program was carried out in the spring of 2019 on the Brittany coast to assess how the surface sediment characteristics drive the benthic effluxes of ammonium ($\mathrm{NH}_{4}^{+}$) and phosphate ($\mathrm{PO}_{4}$) from intertidal mudflats. A total of 200 sediment samples were characterized by their porosity, grain-size, elemental composition and pigment contents, as well as the benthic fluxes of $\mathrm{NH}_{4}^{+}$ and $\mathrm{PO}_{4}$ determined by core incubations. The results showed that (1) a high phaeopigment and iron-bound phosphorus content (Fe-P) and a low porosity were significantly related to the high $\mathrm{PO}_{4}$ flux, and (2) a high porosity and the TN:Org-P ratio in the sediment organic matter (SOM) were related to the high $\mathrm{NH}_{4}^{+}$ flux. This indicated that $\mathrm{PO}_{4}$ fluxes would be more driven by the redox status of the sediment through the desorption of Fe-P under specific anoxic conditions during the algal decomposition. $\mathrm{NH}_{4}^{+}$ fluxes would be more driven by high $\mathrm{NH}_{4}^{+}$ recycling rates from SOM mineralization and high sediment–water exchanges, enhancing the diffusion of $\mathrm{NH}_{4}^{+}$ to the overlying water. The present study allowed to highlight the large variability in the benthic nutrient fluxes at the regional scale, as a result of the connections between microbial (SOM mineralization), chemical (adsorption–desorption) and physical (diffusion) processes. |
| first_indexed | 2024-03-11T16:14:17Z |
| format | Article |
| id | doaj.art-82f6ad02cd944e798f707ac8f3de706f |
| institution | Directory Open Access Journal |
| issn | 1778-7025 |
| language | English |
| last_indexed | 2024-03-11T16:14:17Z |
| publishDate | 2021-05-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj.art-82f6ad02cd944e798f707ac8f3de706f2023-10-24T14:24:05ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252021-05-01353117319110.5802/crgeos.5710.5802/crgeos.57Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics?Louis, Justine0https://orcid.org/0000-0002-8589-5768Jeanneau, Laurent1https://orcid.org/0000-0002-7588-0490Andrieux-Loyer, Françoise2https://orcid.org/0000-0001-6433-012XGruau, Gérard3https://orcid.org/0000-0003-3455-2738Caradec, Florian4Lebris, Nathalie5Chorin, Marion6Jardé, Emilie7https://orcid.org/0000-0001-8108-4055Rabiller, Emilie8Petton, Christophe9Bouger, Guillaume10Petitjean, Patrice11Laverman, Anniet M.12https://orcid.org/0000-0003-1232-1189Centre National de la Recherche Scientifique (CNRS), ECOBIO – UMR 6553, Université de Rennes 1, 35042 Rennes, FranceCentre National de la Recherche Scientifique (CNRS), Géosciences Rennes – UMR 6118, Université de Rennes 1, 35042 Rennes, FranceIfremer, DYNECO PELAGOS, ZI Pointe du Diable, 29280 Plouzané, FranceCentre National de la Recherche Scientifique (CNRS), Géosciences Rennes – UMR 6118, Université de Rennes 1, 35042 Rennes, FranceIfremer, DYNECO PELAGOS, ZI Pointe du Diable, 29280 Plouzané, FranceCentre National de la Recherche Scientifique (CNRS), ECOBIO – UMR 6553, Université de Rennes 1, 35042 Rennes, FranceCentre National de la Recherche Scientifique (CNRS), ECOBIO – UMR 6553, Université de Rennes 1, 35042 Rennes, FranceCentre National de la Recherche Scientifique (CNRS), Géosciences Rennes – UMR 6118, Université de Rennes 1, 35042 Rennes, FranceIfremer, DYNECO PELAGOS, ZI Pointe du Diable, 29280 Plouzané, FranceCentre National de la Recherche Scientifique (CNRS), Géosciences Rennes – UMR 6118, Université de Rennes 1, 35042 Rennes, FranceCentre National de la Recherche Scientifique (CNRS), ECOBIO – UMR 6553, Université de Rennes 1, 35042 Rennes, FranceCentre National de la Recherche Scientifique (CNRS), Géosciences Rennes – UMR 6118, Université de Rennes 1, 35042 Rennes, FranceCentre National de la Recherche Scientifique (CNRS), ECOBIO – UMR 6553, Université de Rennes 1, 35042 Rennes, FranceA broad sampling program was carried out in the spring of 2019 on the Brittany coast to assess how the surface sediment characteristics drive the benthic effluxes of ammonium ($\mathrm{NH}_{4}^{+}$) and phosphate ($\mathrm{PO}_{4}$) from intertidal mudflats. A total of 200 sediment samples were characterized by their porosity, grain-size, elemental composition and pigment contents, as well as the benthic fluxes of $\mathrm{NH}_{4}^{+}$ and $\mathrm{PO}_{4}$ determined by core incubations. The results showed that (1) a high phaeopigment and iron-bound phosphorus content (Fe-P) and a low porosity were significantly related to the high $\mathrm{PO}_{4}$ flux, and (2) a high porosity and the TN:Org-P ratio in the sediment organic matter (SOM) were related to the high $\mathrm{NH}_{4}^{+}$ flux. This indicated that $\mathrm{PO}_{4}$ fluxes would be more driven by the redox status of the sediment through the desorption of Fe-P under specific anoxic conditions during the algal decomposition. $\mathrm{NH}_{4}^{+}$ fluxes would be more driven by high $\mathrm{NH}_{4}^{+}$ recycling rates from SOM mineralization and high sediment–water exchanges, enhancing the diffusion of $\mathrm{NH}_{4}^{+}$ to the overlying water. The present study allowed to highlight the large variability in the benthic nutrient fluxes at the regional scale, as a result of the connections between microbial (SOM mineralization), chemical (adsorption–desorption) and physical (diffusion) processes.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.57/Benthic nutrient fluxesCoastal sedimentOrganic matterSpatial variabilityDiffusive transportMicrobial and chemical processes |
| spellingShingle | Louis, Justine Jeanneau, Laurent Andrieux-Loyer, Françoise Gruau, Gérard Caradec, Florian Lebris, Nathalie Chorin, Marion Jardé, Emilie Rabiller, Emilie Petton, Christophe Bouger, Guillaume Petitjean, Patrice Laverman, Anniet M. Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics? Comptes Rendus. Géoscience Benthic nutrient fluxes Coastal sediment Organic matter Spatial variability Diffusive transport Microbial and chemical processes |
| title | Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics? |
| title_full | Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics? |
| title_fullStr | Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics? |
| title_full_unstemmed | Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics? |
| title_short | Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics? |
| title_sort | are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics |
| topic | Benthic nutrient fluxes Coastal sediment Organic matter Spatial variability Diffusive transport Microbial and chemical processes |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.57/ |
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