Dynamics of particulate organic matter composition in coastal systems: a spatio-temporal study at multi-systems scale

Camilla Liénart; Nicolas Savoye; Yann Bozec; Elsa Breton; Pascal Conan; Valérie David; Eric Feunteun; Karine Grangeré; Philippe Kerhervé; Benoit Lebreton; Sébastien Lefebvre; Stéphane l'Helguen; Laure Mousseau; Patrick Raimbault; Pierre Richard; Pascal Riera; Pierre-Guy Sauriau; Gauthier Schaal; Fabien Aubert; Sébastien Aubin; Sabrina Bichon; Christophe Boinet; Line Bourasseau; Martine Bréret; Jocelyne Caparros; Thierry Cariou; Karine Charlier; Pascal Claquin; Vincent Cornille; Anne-Marie Corre; Laurence Costes; Olivier Crispi; Muriel Crouvoisier; Marie Czamanski; Yolanda del Amo; Hervé Derriennic; Francois Dindinaud; Maïa Durozier; Vincent Hanquiez; Antoine Nowaczyk; Jérémy Devesa; Sophie Ferreira; Michel Fornier; Fabrice Garcia; Nicole Garcia; Sandrine Geslin; Emilie Grossteffan; Aurore Gueux; Julien Guillaudeau; Gaël Guillou; Orianne Joly; Nicolas Lachaussée; Michel Lafont; Jézabel Lamoureux; Eric Lecuyer; Jean-Paul Lehodey; David Lemeille; Cédric Leroux; Eric Macé; Eric Maria; Philippe Pineau; Franck Petit; Mireille Pujo-Pay; Peggy Rimelin-Maury; Emmanuelle Sultan

doi:10.1016/j.pocean.2017.03.001

Journal articles

Dynamics of particulate organic matter composition in coastal systems: a spatio-temporal study at multi-systems scale

Camilla Liénart ¹ Nicolas Savoye ¹ Yann Bozec ² Elsa Breton ³ Pascal Conan ⁴ Valérie David ¹ Eric Feunteun ^{5, 6, 7} Karine Grangeré ⁶ Philippe Kerhervé ⁸ Benoit Lebreton ⁹ Sébastien Lefebvre ³ Stéphane l'Helguen ¹⁰ Laure Mousseau ¹¹ Patrick Raimbault ¹² Pierre Richard ⁹ Pascal Riera ¹³ Pierre-Guy Sauriau ⁹ Gauthier Schaal ¹⁰ Fabien Aubert ⁹ Sébastien Aubin ^{7, 14} Sabrina Bichon ¹ Christophe Boinet ^{7, 14} Line Bourasseau ¹⁵ Martine Bréret ⁹ Jocelyne Caparros ⁴ Thierry Cariou ¹⁶ Karine Charlier ¹⁵ Pascal Claquin ⁶ Vincent Cornille ³ Anne-Marie Corre ¹¹ Laurence Costes ¹ Olivier Crispi ⁴ Muriel Crouvoisier ³ Marie Czamanski ¹⁷ Yolanda del Amo ¹ Hervé Derriennic ¹⁵ Francois Dindinaud ¹ Maïa Durozier ¹¹ Vincent Hanquiez ¹ Antoine Nowaczyk ¹ Jérémy Devesa ¹⁰ Sophie Ferreira ¹⁸ Michel Fornier ¹² Fabrice Garcia ¹² Nicole Garcia ¹² Sandrine Geslin ^{5, 14, 7} Emilie Grossteffan ¹⁷ Aurore Gueux ⁴ Julien Guillaudeau ^{5, 14, 7} Gaël Guillou ⁹ Orianne Joly ¹⁹ Nicolas Lachaussée ⁹ Michel Lafont ¹² Jézabel Lamoureux ^{5, 14, 7} Eric Lecuyer ³ Jean-Paul Lehodey ¹⁹ David Lemeille ¹⁹ Cédric Leroux ¹⁶ Eric Macé ²⁰ Eric Maria ⁴ Philippe Pineau ⁹ Franck Petit ¹¹ Mireille Pujo-Pay ⁴ Peggy Rimelin-Maury ¹⁷ Emmanuelle Sultan ^{5, 14, 7}

1 EPOC - Environnements et Paléoenvironnements OCéaniques

2 CHIM - CHImie Marine

AD2M - Adaptation et diversité en milieu marin

3 LOG - Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187

4 LOMIC - Laboratoire d'Océanographie Microbienne

5 CRESCO - Centre De Recherche et d'Enseignement sur les Systèmes Côtiers

6 BOREA - Biologie des Organismes et Ecosystèmes Aquatiques

7 Station marine Dinard

8 CEFREM - Centre de Formation et de Recherche sur les Environnements Méditérranéens

9 LIENSs - LIttoral ENvironnement et Sociétés - UMRi 7266

10 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)

11 LOV - Laboratoire d'océanographie de Villefranche

12 MIO - Institut méditerranéen d'océanologie

13 EFEB - Ecogéochimie et Fonctionnement des Ecosystèmes Benthiques

AD2M - Adaptation et diversité en milieu marin

14 MNHN - Muséum national d'Histoire naturelle

15 EPOC - UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux

16 SBR - Station biologique de Roscoff

17 IUEM - Institut Universitaire Européen de la Mer

18 OASU - Observatoire aquitain des sciences de l'univers

19 CREC - Centre de recherches en environnement côtier

20 AD2M - Adaptation et diversité en milieu marin

Abstract : In coastal systems, the multiplicity of sources fueling the pool of particulate organic matter (POM) leads to divergent estimations of POM composition. Eleven systems (two littoral systems, eight embayments and semi-enclosed systems and one estuary) distributed along the three maritime façades of France were studied for two to eight years in order to quantify the relative contribution of organic matter sources to the surface-water POM pool in coastal systems. This study was based on carbon and nitrogen elemental and isotopic ratios, used for running mixing models. The POM of the estuary is dominated by terrestrial material (93% on average), whereas the POM of the other systems is dominated by phytoplankton (84% on average). Nevertheless, for the latter systems, the POM composition varies in space, with 1) systems where POM is highly composed of phytoplankton (≥ 93%), 2) systems characterized by a non-negligible contribution of benthic (8 to 19%) and/or riverine (7 to 19%) sources, and 3) the Mediterranean systems characterized by the contribution of diazotroph organisms (ca. 14%). A continent-to-ocean gradient of riverine and/or benthic POM contribution is observed. Finally, time series reveal 1) seasonal variations of POM composition, 2) differences in seasonality between systems, and 3) an inshore-offshore gradient of seasonality within each system that were sampled at several stations. Spatial and seasonal patterns of POM composition are mainly due to local to regional processes such as hydrodynamics and sedimentary hydrodynamic (e.g. resuspension processes, changes in river flows, wind patterns influencing along-shore currents) but also due to the geomorphology of the systems (depth of the water column, distance to the shore). Future studies investigating the link between these forcings and POM composition would help to better understand the dynamics of POM composition in coastal systems.

Keywords : mixing model C and N stable isotopes ACL meta-analysis france coastal systems C:N ratio particulate organic matter

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Journal articles

Domain :

Sciences of the Universe [physics] / Earth Sciences / Oceanography

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