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

Camilla Liénart 1 Nicolas Savoye 1 Valérie David 1 Pierre Ramond 2 Paco Rodriguez Tress 1 Vincent Hanquiez 3 Vincent Marieu 3 Sébastien Aubin 4, 5 Fabien Aubert 6 Sabrina Bichon 1 Christophe Boinet 5 Line Bourasseau 1 Yann Bozec 7 Martine Bréret 6 Elsa Breton 8 Jocelyne Caparros 9 Thierry Cariou 10 Pascal Claquin 11 Pascal Conan 9 Anne-Marie Corre 12 Laurence Costes 13, 1 Muriel Crouvoisier 8 Yolanda del Amo 1 Hervé Derriennic 3 Francois Dindinaud 1 Robert Duran 14 Maïa Durozier 15 Jérémy Devesa 16 Sophie Ferreira 17 Eric Feunteun 5, 11 Nicole Garcia 18, 19 Sandrine Geslin 5, 4 Emilie Grossteffan 16 Aurore Gueux 9 Julien Guillaudeau 5, 4 Gael Guillou 6 Orianne Jolly 20 Nicolas Lachaussée 6 Michel Lafont 19 Véronique Lagadec 19 Jézabel Lamoureux 4, 5 Béatrice Lauga 14 Benoit Lebreton 6 Eric Lecuyer 8 Jean-Paul Lehodey 20 Cédric Leroux 10 Stéphane l'Helguen 16 Éric Macé 21, 10 Eric Maria 9 Laure Mousseau 15 Antoine Nowaczyk 1 Philippe Pineau 6 Franck Petit 12 Mireille Pujo-Pay 9 Patrick Raimbault 18, 19 Peggy Rimmelin-Maury 16 Vanessa Rouaud 14 Pierre-Guy Sauriau 6 Emmanuelle Sultan 4, 5 Nicolas Suspérregui 14, 22
Abstract : In costal systems, particulate organic matter (POM) results from a multiplicity of sources having their respective dynamics in terms of production, decomposition, transport and burial. The POM pool experiences thus considerable spatial and temporal variability. In order to better understand this variability, the present study employs statistical multivariate analyses to investigate links between POM composition and environmental forcings for a panel of twelve coastal systems distributed along the three maritime regions of France and monitored weekly to monthly for 1 to 8 years. At multi-system scale, two main gradients of POC composition have been identified: a 'Continent-Ocean' gradient associated with hydrodynamics, sedimentary dynamics and depth of the water column, and a gradient of trophic status related to nutrient availability. At local scale, seasonality of POC composition appears to be station-specific but still related to part of the above-mentioned forcings. A typology of systems was established by coupling spatial and temporal variability of POC composition. Four groups were highlighted: (1) the estuarine stations where POC composition is dominated by terrestrial POM and driven by hydrodynamics and sedimentary processes, (2) the oligotrophic systems, characterized by the contribution of diazotrophs due to low nutrient availability, and the marine meso/eutroph systems whose POC composition is (3) either deeply dominated by phytoplankton or (4) dominated by phytoplankton but where the contribution of continental and benthic POC is not negligible and is driven by hydrodynamics, sedimentary processes and the height of the water column. Finally, the present study provides several insights into the different forcings to POM composition and dynamics in temperate coastal systems at local and multi-system scales. This work also presents a methodological approach that establishes statistical links between forcings and POM composition, helping to gain more objectively insight of forcings.
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Camilla Liénart, Nicolas Savoye, Valérie David, Pierre Ramond, Paco Rodriguez Tress, et al.. Dynamics of particulate organic matter composition in coastal systems: Forcing of spatio-temporal variability at multi-systems scale. Progress in Oceanography, Elsevier, 2018, 162, pp.271-289. ⟨10.1016/j.pocean.2018.02.026⟩. ⟨hal-02329982⟩

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