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 1 Vincent Marieu 1 Fabien Aubert 3 Sébastien Aubin 4 Sabrina Bichon 1 C. Boinet L. Bourasseau Y. Bozec Martine Bréret 3 E. Breton J. Caparros 5 T. Cariou 6 P. Claquin 7 P. Conan 5 A.-M. Corre L. Costes M. Crouvoisier Y. Del Amo H. Derriennic F. Dindinaud R. Duran 8 M. Durozier J. Devesa S. Ferreira E. Feunteun 4 N. Garcia S. Geslin 9 E. Grossteffan 10 A. Gueux J. Guillaudeau Gaël Guillou 3 O. Jolly Nicolas Lachaussée 3 M. Lafont 11 V. Lagadec J. Lamoureux B. Lauga 8 Benoit Lebreton 3 E. Lecuyer 12 J.-P. Lehodey C. Leroux S. L'Helguen E. Macé E. Maria 13 L. Mousseau 14 A. Nowaczyk 1 Philippe Pineau 3 F. Petit M. Pujo-Pay 5 Patrick Raimbault 11 P. Rimmelin-Maury V. Rouaud Pierre-Guy Sauriau 3 Emmanuelle Sultan 4 Nicolas Susperregui
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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https://hal.archives-ouvertes.fr/hal-01841775
Contributeur : Sylvie Blanc <>
Soumis le : mardi 17 juillet 2018 - 15:16:06
Dernière modification le : jeudi 7 février 2019 - 16:23:36

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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-01841775〉

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