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) 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.

Disciplines

Biological oceanography, Chemical oceanography

Keywords

RiOMar, surface sediment, spatial distribution, sedimentary organics, bioturbation

Location

45.843812N, 45.220443S, -1.004773E, -1.977063W

Data

FileSizeFormatProcessingAccess
Mean values of surface sediment characteristics (0-1cm) and Sediment Profile Images characteristics. Summed Bottom Trawling Effort and 95th percentile of Bottom Shear Stress (June 2017-June 2018)
16 KoXLS, XLSXProcessed data
How to cite
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

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