Dynamics of particulate organic matter composition in coastal systems: a spatio-temporal study at multi-systems scale
|Author(s)||Lienart Camilla1, Savoye Nicolas1, Bozec Yann2, Breton Elsa3, Conan Pascal4, David Valerie1, Feunteun Eric5, Grangere Karine6, Kerherve Philippe7, Lebreton Benoit8, Lefebvre Sebastien3, L'Helguen Stephane9, Mousseau Laure10, Raimbault Patrick11, Richard Pierre8, Riera Pascal2, Sauriau Pierre-Guy8, Schaal Gauthier9, Aubert Fabien8, Aubin Sebastien12, Bichon Sabrina1, Boinet Christophe12, Bourasseau Line1, Breret Martine8, Caparros Jocelyne4, Cariou Thierry13, Charlier Karine14, Claquin Pascal6, Cornille Vincent3, Corre Anne-Marie10, Costes Laurence1, Crispi Olivier4, Crouvoisier Muriel3, Czamanski Marie15, Del Amo Yolanda1, Derriennic Herve14, Dindinaud Francois1, Durozieri Maia10, Hanquiez Vincent14, Nowaczyk Antoine1, Devesa Jeremy9, Ferreira Sophie16, Fornier Michel11, Garcia Fabrice11, Garcia Nicole11, Geslin Sandrine12, Grossteffan Emilie15, Gueux Aurore4, Guillaudeau Julien12, Guillou Gael8, Joly Orianne17, Lachaussee Nicolas8, Lafont Michel11, Lamoureux Jezabel12, Lecuyer Eric3, Lehodey Jean-Paul17, Lemeille David17, Leroux Cedric13, Mace Eric2, Maria Eric4, Pineau Philippe8, Petit Franck10, Pujo-Pay Mireille4, Rimelin-Maury Peggy15, Sultan Emmanuelle12|
|Affiliation(s)||1 : Univ Bordeaux, CNRS, UMR EPOC 5805, Stn Marine Arcachon, F-33120 Arcachon, France.
2 : UPMC Univ Paris 06, Sorbonne Univ, CNRS, UMR AD2M 7144,Stn Biol Roscoff, F-29680 Roscoff, France.
3 : Univ Littoral Cote dOpale, Univ Lille, CNRS, UMR LOG 8187, F-62930 Wimereux, France.
4 : UPMC Univ Paris 06, Sorbonne Univ, CNRS, LOMIC UMR7621,Observ Oceanol, F-66650 Banyuls Sur Mer, France.
5 : UPMC Univ Paris 06, Univ Caen Normandie, MNHN, UMR BOREA,CNRS 7208,IRD 207,CRESCO MNHN,Stn Marin, F-35800 Dinard, France.
6 : UPMC Univ Paris 06, Univ Caen Normandie, UMR BOREA, CNRS 7208,IRD 207,Esplanade Paix, F-14032 Caen, France.
7 : Univ Perpignan, CNRS, UMR CEFREM 5110, 52 Av Paul Alduy, F-66860 Perpignan, France.
8 : Univ la Rochelle, CNRS, UMR LIENSs 7266, 2 Rue Olympe Gouges, F-17000 La Rochelle, France.
9 : Univ Bretagne Occidentale, CNRS, IRD, IFREMER,IUEM,UMR LEMAR 6539, Rue Dumont Urville, F-29280 Plouzane, France.
10 : UPMC Univ Paris 06, Sorbonne Univ, CNRS, UMR LOV 7093,Observ Oceanol, F-06230 Villefranche Sur Mer, France.
11 : Aix Marseille Univ, Univ Toulon, CNRS, IRD,UM MIO 110,INSU, 163 Ave Luminy, F-13288 Marseille, France.
12 : MNHN, Serv Stn Marines MNHN, CRESCO, Stn Marine Dinard, F-35800 Dinard, France.
13 : UPMC Univ Paris 06, Sorbonne Univ, CNRS, FR2424,Stn Biol Roscoff, F-29680 Roscoff, France.
14 : Univ Bordeaux, CNRS, UMR EPOC 5805, Allee Geoffroy St Hilaire, F-33600 Pessac, France.
15 : Univ Bretagne Occidentale, OSU UMS IUEM 3113, Rue Dumont dUrville, F-29280 Plouzane, France.
16 : Univ Bordeaux, CNRS, OASU, UMS POREA 2567, Allee Geoffroy St Hilaire, F-33600 Pessac, France.
17 : Univ Caen Basse Normandie, CREC Stn Marine, 54 Rue Dr Charcot, F-14530 Luc Sur Mer, France.
|Source||Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2017-08 , Vol. 156 , P. 221-239|
|WOS© Times Cited||9|
|Keyword(s)||Particulate organic matter, Coastal systems, C and N stable isotopes, C:N ratio, Mixing model|
|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.|