Dynamics of particulate organic matter composition in coastal systems: a spatio-temporal study at multi-systems scale - Archive ouverte HAL Access content directly
Journal Articles Progress in Oceanography Year : 2017

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, 4) , Pascal Conan (5) , Valérie David (1) , Eric Feunteun (6, 7, 8) , Karine Grangeré (7) , Philippe Kerhervé (9) , Benoit Lebreton (10) , Sébastien Lefebvre (3) , Stéphane L'Helguen (11) , Laure Mousseau (12) , Patrick Raimbault (13) , Pierre Richard (10) , Pascal Riera (14) , Pierre-Guy Sauriau (10) , Gauthier Schaal (11) , Fabien Aubert (10) , Sébastien Aubin (8, 15) , Sabrina Bichon (1) , Christophe Boinet (8, 15) , Line Bourasseau (1) , Martine Bréret (10) , Jocelyne Caparros (5) , Thierry Cariou (16, 17) , Karine Charlier (1) , Pascal Claquin (7) , Vincent Cornille (3) , Anne-Marie Corre (12) , Laurence Costes (1) , Olivier Crispi (5) , Muriel Crouvoisier (3) , Marie Czamanski (18) , Yolanda del Amo (1) , Hervé Derriennic (1) , Francois Dindinaud (1) , Maïa Durozier (12) , Vincent Hanquiez (1) , Antoine Nowaczyk (1) , Jérémy Devesa (11) , Sophie Ferreira (19) , Michel Fornier (13) , Fabrice Garcia (13) , Nicole Garcia (13) , Sandrine Geslin (6, 15, 8) , Emilie Grossteffan (18) , Aurore Gueux (5) , Julien Guillaudeau (6, 15, 8) , Gaël Guillou (10) , Orianne Joly (20) , Nicolas Lachaussée (10) , Michel Lafont (13) , Jézabel Lamoureux (6, 15, 8) , Eric Lecuyer (3) , Jean-Paul Lehodey (20) , David Lemeille (20) , Cédric Leroux (16, 17) , Eric Macé (21, 17, 16) , Eric Maria (5) , Philippe Pineau (10) , Franck Petit (12) , Mireille Pujo-Pay (5) , Peggy Rimelin-Maury (18) , Emmanuelle Sultan (6, 15, 8)
Yann Bozec
Benoit Lebreton
Nicole Garcia

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.
Fichier principal
Vignette du fichier
Lienart_etal_PiO_2017.pdf (2.28 Mo) Télécharger le fichier
Origin Files produced by the author(s)
Loading...

Dates and versions

hal-01510337 , version 1 (14-05-2020)

Identifiers

Cite

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, 2017, 156, pp.221-239. ⟨10.1016/j.pocean.2017.03.001⟩. ⟨hal-01510337⟩
1684 View
186 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More