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

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) (2) profile image (apparent Redox Potential Discontinuity (aRPD), numbers depths biological traces) were quantified based on the sampling 32 stations located within West Gironde Mud Patch (Bay Biscay, NE Atlantic) in view assessing structuration a temperate river-dominated ocean margin high-energy area, disentangling impacts hydrodynamics bottom trawling this structuration, (3) comparing with Rhône River Prodelta (located low-energy area). Results support subdivision proximal distal part show existence depth gradients sedimentary organics bioturbation part; no evidence for significant effect trawling, as opposed to Bottom Shear Stress, structuration; major discrepancies between Prodelta, which attributed differences tidal regimes, sedimentation processes, local hydrodynamics, is agreement current typologies.