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

Camilla Liénart 1 Nicolas Savoye 2 Yann Bozec 3 Elsa Breton 4 Pascal Conan 5 Valérie David 6 Eric Feunteun 7, 1 Karine Grangeré 1 Philippe Kerhervé 8 Benoit Lebreton 6, 9 Sébastien Lefebvre 10 Stéphane L'Helguen 11 Laure Mousseau 12 Patrick Raimbault 13 Pierre Richard 6 Pascal Riera 14 Pierre-Guy Sauriau 6 Gauthier Schaal 11 Fabien Aubert 6 Sébastien Aubin 15 Sabrina Bichon 16, 17 Christophe Boinet 18 Line Bourasseau 19 Martine Bréret 6 Jocelyne Caparros 5 Thierry Cariou 20 Karine Charlier 19 Pascal Claquin 1 Vincent Cornille 4 Anne-Marie Corre 11 Laurence Costes 21 Olivier Crispi 22 Muriel Crouvoisier 23 Marie Czamanski 24 Yolanda Del Amo 2 Hervé Derriennic 19 Francois Dindinaud 2 Maïa Durozier 12 Vincent Hanquiez 2 Antoine Nowaczyk 25 Jérémy Devesa 11 Sophie Ferreira 26 Michel Fornier 13 Fabrice Garcia 13 Nicole Garcia 13 Sandrine Geslin 7 Emilie Grossteffan 27 Aurore Gueux 5 Julien Guillaudeau 7 Gaël Guillou 6 Orianne Joly 28 Nicolas Lachaussée 6 Michel Lafont 29 Jézabel Lamoureux 7 Eric Lecuyer 4 Jean-Paul Lehodey 1, 30, 28 David Lemeille 28 Cédric Leroux 20 Eric Macé 31 Eric Maria 5 Philippe Pineau 6 Franck Petit 12 Mireille Pujo-Pay 5 Peggy Rimelin-Maury 24 Emmanuelle Sultan 7
3 CHIM - CHImie Marine
ADMM - Adaptation et diversité en milieu marin
14 EFEB - Ecogéochimie et Fonctionnement des Ecosystèmes Benthiques
ADMM - Adaptation et diversité en milieu marin
MIO - Institut méditerranéen d'océanologie
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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Submitted on : Wednesday, April 19, 2017 - 1:54:41 PM
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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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