How the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflats
The origin of sedimentary organic matter (SOM) has often been mentioned as a driver of SOM reactivity. This was quantified by statistically relating the isotopic and lipid composition of SOM to benthic nutrient fluxes in 200 intertidal mudflats sampled along the Brittany coast (France). The origin o...
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Académie des sciences
2023-07-01
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| Series: | Comptes Rendus. Géoscience |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.228/ |
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| author | Jeanneau, Laurent Jardé, Emilie Louis, Justine Pannard, Alexandrine Liotaud, Marine Andrieux-Loyer, Françoise Gruau, Gérard Caradec, Florian Rabiller, Emilie Lebris, Nathalie Laverman, Anniet |
| author_facet | Jeanneau, Laurent Jardé, Emilie Louis, Justine Pannard, Alexandrine Liotaud, Marine Andrieux-Loyer, Françoise Gruau, Gérard Caradec, Florian Rabiller, Emilie Lebris, Nathalie Laverman, Anniet |
| author_sort | Jeanneau, Laurent |
| collection | DOAJ |
| description | The origin of sedimentary organic matter (SOM) has often been mentioned as a driver of SOM reactivity. This was quantified by statistically relating the isotopic and lipid composition of SOM to benthic nutrient fluxes in 200 intertidal mudflats sampled along the Brittany coast (France). The origin of SOM explained 24% and 31% of the variance of $\text{NH}_4^+$ and $\text{PO}_4^{3-}$ fluxes, respectively. The $\text{NH}_4^+$ fluxes were driven by the uptake by phytoplankton of dissolved anthropogenic N exported from agricultural catchments. Their sedimentation is favoured by low hydrodynamic conditions, enriching the sediments with labile OM. The $\text{PO}_4^{3-}$ fluxes were driven by the sedimentation of particulate P exported through agricultural soil erosion. |
| format | Article |
| id | doaj-art-8884c33871ec4608bb86c9a95aeda799 |
| institution | Kabale University |
| issn | 1778-7025 |
| language | English |
| publishDate | 2023-07-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj-art-8884c33871ec4608bb86c9a95aeda7992025-02-07T10:40:42ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252023-07-01355G223725810.5802/crgeos.22810.5802/crgeos.228How the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflatsJeanneau, Laurent0https://orcid.org/0000-0002-7588-0490Jardé, Emilie1https://orcid.org/0000-0001-8108-4055Louis, Justine2https://orcid.org/0000-0002-8589-5768Pannard, Alexandrine3https://orcid.org/0000-0003-2997-5744Liotaud, Marine4Andrieux-Loyer, Françoise5https://orcid.org/0000-0001-6433-012XGruau, Gérard6https://orcid.org/0000-0003-3455-2738Caradec, Florian7Rabiller, Emilie8Lebris, Nathalie9Laverman, Anniet10https://orcid.org/0000-0003-1232-1189Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, F-35000 Rennes, FranceUniv Rennes, CNRS, Géosciences Rennes, UMR 6118, F-35000 Rennes, FranceIfremer, DYNECO, F-29280 Plouzané, France; Univ Rennes, CNRS, ECOBIO, UMR 6553, F-35000 Rennes, FranceUniv Rennes, CNRS, ECOBIO, UMR 6553, F-35000 Rennes, FranceUniv Rennes, CNRS, Géosciences Rennes, UMR 6118, F-35000 Rennes, FranceIfremer, DYNECO, F-29280 Plouzané, FranceUniv Rennes, CNRS, Géosciences Rennes, UMR 6118, F-35000 Rennes, FranceIfremer, DYNECO, F-29280 Plouzané, FranceIfremer, DYNECO, F-29280 Plouzané, FranceUniv Rennes, CNRS, ECOBIO, UMR 6553, F-35000 Rennes, FranceUniv Rennes, CNRS, ECOBIO, UMR 6553, F-35000 Rennes, FranceThe origin of sedimentary organic matter (SOM) has often been mentioned as a driver of SOM reactivity. This was quantified by statistically relating the isotopic and lipid composition of SOM to benthic nutrient fluxes in 200 intertidal mudflats sampled along the Brittany coast (France). The origin of SOM explained 24% and 31% of the variance of $\text{NH}_4^+$ and $\text{PO}_4^{3-}$ fluxes, respectively. The $\text{NH}_4^+$ fluxes were driven by the uptake by phytoplankton of dissolved anthropogenic N exported from agricultural catchments. Their sedimentation is favoured by low hydrodynamic conditions, enriching the sediments with labile OM. The $\text{PO}_4^{3-}$ fluxes were driven by the sedimentation of particulate P exported through agricultural soil erosion.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.228/Sedimentary organic matterOrganic matter originC and N Stable isotopeLipid compositionBenthic N and P fluxesIntertidal mudflat |
| spellingShingle | Jeanneau, Laurent Jardé, Emilie Louis, Justine Pannard, Alexandrine Liotaud, Marine Andrieux-Loyer, Françoise Gruau, Gérard Caradec, Florian Rabiller, Emilie Lebris, Nathalie Laverman, Anniet How the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflats Comptes Rendus. Géoscience Sedimentary organic matter Organic matter origin C and N Stable isotope Lipid composition Benthic N and P fluxes Intertidal mudflat |
| title | How the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflats |
| title_full | How the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflats |
| title_fullStr | How the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflats |
| title_full_unstemmed | How the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflats |
| title_short | How the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflats |
| title_sort | how the origin of sedimentary organic matter impacts the benthic nutrient fluxes in shallow coastal mudflats |
| topic | Sedimentary organic matter Organic matter origin C and N Stable isotope Lipid composition Benthic N and P fluxes Intertidal mudflat |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.228/ |
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