Spatial Distributions of Surface Sedimentary Organics and Sediment Profile Image Characteristics in a High-Energy Temperate Marine RiOMar: The West Gironde Mud Patch

Date 2018
Temporal extent 2018-05-27 -2018-06-13
Author(s) Lamarque BastienORCID1, Deflandre Bruno2, Galindo Dalto Adriana3, Schmidt Sabine2, Romero-Ramirez Alicia1, Garabetian Frédéric1, Dubosq Nicolas2, Diaz Mélanie2, Grasso FlorentORCID4, Sottolichio Aldo2, Bernard Guillaume1, Gillet Hervé2, Cordier Marie-Ange2, Poirier Dominique2, Lebleu Pascal2, Derriennic Hervé2, Danilo Martin2, Murilo Barboza Tenório Márcio3, Grémare Antoine1
Affiliation(s) 1 : UMR EPOC, Université de Bordeaux, CNRS, UMR 5805, Station Marine d’Arcachon, 2 rue du Professeur Jolyet, F33120 Arcachon, France
2 : UMR EPOC, Université de Bordeaux, CNRS, UMR 5805, Bâtiments B18/B18N, Allée Geoffroy Saint-Hilaire, F33615 Pessac CEDEX, France
3 : Departamento de Biologia Marinha, Instituto de Biologia, Universidade Federal do Rio de Janeiro, CEP 21941-902 Rio de Janeiro, Brazil
4 : IFREMER —DYNECO/DHYSED, Centre de Bretagne, CS 10070, 29280 Plouzané, France
DOI 10.17882/78991
Publisher SEANOE
Keyword(s) RiOMar, surface sediment, spatial distribution, sedimentary organics, bioturbation
Abstract

The spatial distributions of (1) surface sediment characteristics (D0.5, Sediment Surface Area (SSA), Particulate Organic Carbon (POC), Chlorophyll-a (Chl-a), Phaeophytin-a (Phaeo-a), Total and Enzymatically Hydrolyzable Amino Acids (THAA, EHAA), δ13C) and (2) sediment profile image (apparent Redox Potential Discontinuity (aRPD), numbers and depths of biological traces) characteristics were quantified based on the sampling of 32 stations located within the West Gironde Mud Patch (Bay of Biscay, NE Atlantic) in view of (1) assessing the spatial structuration of a temperate river-dominated ocean margin located in a high-energy area, (2) disentangling the impacts of hydrodynamics and bottom trawling on this structuration, and (3) comparing the West Gironde Mud Patch with the Rhône River Prodelta (located in a low-energy area). Results support the subdivision of the West Gironde Mud Patch in a proximal and a distal part and show (1) the existence of depth gradients in surface sedimentary organics characteristics and bioturbation within the distal part; (2) no evidence for a significant effect of bottom trawling, as opposed to Bottom Shear Stress, on the West Gironde Mud Patch spatial structuration; and (3) major discrepancies between spatial structuration in the West Gironde Mud Patch and the Rhône River Prodelta, which were attributed to differences in tidal regimes, sedimentation processes, and local hydrodynamics, which is in agreement with current river-dominated ocean margin typologies.

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Lamarque Bastien, Deflandre Bruno, Galindo Dalto Adriana, Schmidt Sabine, Romero-Ramirez Alicia, Garabetian Frédéric, Dubosq Nicolas, Diaz Mélanie, Grasso Florent, Sottolichio Aldo, Bernard Guillaume, Gillet Hervé, Cordier Marie-Ange, Poirier Dominique, Lebleu Pascal, Derriennic Hervé, Danilo Martin, Murilo Barboza Tenório Márcio, Grémare Antoine (2018). Spatial Distributions of Surface Sedimentary Organics and Sediment Profile Image Characteristics in a High-Energy Temperate Marine RiOMar: The West Gironde Mud Patch. SEANOE. https://doi.org/10.17882/78991