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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
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.
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Camilla Liénart, Nicolas Savoye, Yann Bozec, Elsa Breton, Pascal Conan, et al.. Dynamics of particulate organic matter composition in coastal systems: a spatio-temporal study at multi-systems scale. Progress in Oceanography, Elsevier, 2017, 156, pp.221-239. ⟨10.1016/j.pocean.2017.03.001⟩. ⟨hal-01510337⟩

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