MG004:
Trawling-Induced Sedimentary Processes in Continental Shelf and Slope Environments


Session ID#: 27627

Session Description:
Bottom trawling is a nonselective commercial fishing practice whereby heavy nets and gear are dragged along the seafloor. The role of trawling activities in present-day sediment dynamics may be under appreciated. The direct and indirect impacts of this fishing technique on continental margins can modify the physical properties of surface sediments and alter sediment fluxes and budgets. Fishing gear produces not only the scraping and ploughing of the seabed or the crushing of biogenic structures and small-scale bottom relief, but also the resuspension of sediment with an associated significant increase in near-bottom turbidity that can propagate away from fishing grounds by ambient currents and/or sediment-gravity flows. The chronic impact of trawling alters surface sediment properties, texture and composition, modifies chemical exchanges across the water-sediment interface, causes changes of erosion/accumulation rates and produces shifts of benthic communities, including “ecosystem engineers”, which in turn influence the physical properties of the surface sediments. The sum of these human-induced perturbations of the seafloor results in measurable alterations of the seabed integrity and submarine geomorphology from micro-reliefs to regional spatial scales. We welcome presentations describing field measurements, numerical and conceptual models, and laboratory experiments addressing any of these trawling-induced sedimentary processes. We encourage submissions that assess the magnitude of the sediment fluxes associated with bottom trawling or with any other anthropogenic activity (e.g. dredging, deep-sea mining) causing similar impacts on the seabed.
Primary Chair:  Pere Puig, Institut de Ciències del Mar (CSIC), Marine Geosciences, Barcelona, Spain
Co-chairs:  Ferdinand KJ Oberle, USGS, Pacific Coastal and Marine Science Center, Santa Cruz, CA, United States and Jacobo Martin, Centro Austral de Investigaciones Científicas (CADIC-CONICET), Ushuaia, Argentina
Index Terms:

3002 Continental shelf and slope processes [MARINE GEOLOGY AND GEOPHYSICS]
3022 Marine sediments: processes and transport [MARINE GEOLOGY AND GEOPHYSICS]
3045 Seafloor morphology, geology, and geophysics [MARINE GEOLOGY AND GEOPHYSICS]
Cross-Topics:
  • F - Fisheries
  • ME - Marine Ecosystems

Abstracts Submitted to this Session:

Claudio Lo Iacono, National Oceanography Center, Southampton, United Kingdom, Pere Puig, Institut de Ciències del Mar (CSIC), Marine Geosciences, Barcelona, Spain, Sarah Paradis, Autonomous University of Barcelona (UAB), Departament de Física and Institut de Ciència i Tecnologia Ambientals, Barcelona, Spain, Antonio Pusceddu, Università degli Studi di Cagliari, Dipartimento di Scienze della Vita e dell’Ambiente,, Cagliari, Italy, Tommaso Russo, Laboratory of Experimental Ecology and Aquaculture, Department of Biology, University of Rome Tor Vergata, Italy, Pere Masque, Autonomous University of Barcelona (UAB), Barcelona, Spain; Edith Cowan University, School of Natural Sciences & Centre for Marine Ecosystems Research, Perth, Australia and ISLAND Cruise Team
Sarah Paradis1, Pere Puig2, Anna Sanchez-Vidal3, Pere Masqué1,4, Jordi Garcia-Orellana5, Antonio M Calafat-Frau3 and Miquel Canals3, (1)Autonomous University of Barcelona (UAB), Departament de Física and Institut de Ciència i Tecnologia Ambientals, Barcelona, Spain, (2)Institut de Ciències del Mar (CSIC), Marine Geosciences, Barcelona, Spain, (3)Universitat de Barcelona, GRC Geociències Marines, Departament de Dinàmica de la Terra i de l’Oceà, Barcelona, Spain, (4)School of Science, Centre for Marine Ecosystems Research, Edith Cowan University, Joondalup, Australia, (5)Universitat Autònoma de Barcelona, Departament de Física and Institut de Ciència i Tecnologia Ambientals, Barcelona, Spain
Marta Arjona1, Pere Puig1, Mikhail V Emelianov2 and Albert Palanques1, (1)Institut de Ciències del Mar (CSIC), Marine Geosciences, Barcelona, Spain, (2)ICM-CSIC, Physical and Technological Oceanography, Barcelona, Spain
Antonio Pusceddu1, Sarah Paradis2, Pere Masqué3, Pere Puig4, Davide Moccia5, Alessandro Cau5, Tommaso Russo6, Claudio Lo Iacono7 and ISLAND Cruise Team, (1)Università degli Studi di Cagliari, Dipartimento di Scienze della Vita e dell’Ambiente,, Cagliari, Italy, (2)Universitat Autònoma de Barcelona, Spain, Departament de Física and Institut de Ciència i Tecnologia Ambientals,, Bellaterra, 08193,, Spain, (3)Autonomous University of Barcelona (UAB), Departament de Física and Institut de Ciència i Tecnologia Ambientals, Barcelona, Spain, (4)Institut de Ciències del Mar (CSIC), Marine Geosciences, Barcelona, Spain, (5)Università degli Studi di Cagliari, Dipartimento di Scienze della Vita e dell'Ambiente, Cagliari, Italy, (6)Laboratory of Experimental Ecology and Aquaculture, Department of Biology, University of Rome Tor Vergata, Italy, (7)ICM-CSIC, Barcelona, Spain
Pere Puig1, Fabio De Leo2, Claudio Lo Iacono3, Ruth Durán4, Albert Palanques1, Sarah Paradis5, Marta Arjona1, Jorge Guillén4 and ABIDES cruise team, (1)Institut de Ciències del Mar (CSIC), Marine Geosciences, Barcelona, Spain, (2)Ocean Networks Canada, University of Victoria, BC, Canada, (3)National Oceanography Centre (NOC), Marine Geoscience, Southampton, United Kingdom, (4)ICM-CSIC, Marine Geosciences, Barcelona, Spain, (5)Autonomous University of Barcelona (UAB), Departament de Física and Institut de Ciència i Tecnologia Ambientals, Barcelona, Spain
Ruth Durán1, Pere Puig2, Araceli Muñoz3, Claudio Lo Iacono4, Jorge Guillén1 and Albert Palanques2, (1)ICM-CSIC, Marine Geosciences, Barcelona, Spain, (2)Institut de Ciències del Mar (CSIC), Marine Geosciences, Barcelona, Spain, (3)Tragsa-SGP, Madrid, Spain, (4)National Oceanography Centre (NOC), Marine Geoscience, Southampton, United Kingdom
Clare Bradshaw1, Ingrid Tjensvoll1, Mattias Sköld2, Ian Allan3, Hans Nilsson2 and Kristoffer Naes3, (1)Stockholm University, Stockholm, Sweden, (2)SLU Aqua, Sweden, (3)Norwegian Institute for Water Research, Oslo, Norway
Albert Palanques, Pere Puig and Marta Arjona, Institut de Ciències del Mar (CSIC), Marine Geosciences, Barcelona, Spain
Ingrid Tjensvoll1, Mattias Sköld2, Anette Jönsson3 and Clare Bradshaw1, (1)Stockholm University, Stockholm, Sweden, (2)SLU Aqua, Sweden, (3)Swedish Meteorological and Hydrological Institute, Norrköping, Sweden
Till Jens Joerg Hanebuth1, Mary Lee King1, Isabel Mendes2, Susana Lebreiro3, Francisco Lobo4, Ferdinand J Oberle5 and Paulo A Ferreira6, (1)Coastal Carolina University, Conway, SC, United States, (2)University of the Algarve, Faro, Portugal, (3)IGME, Madrid, Spain, (4)IACT-CSIC, Armilla, Spain, (5)USGS Pacific Coastal and Marine Science Center Santa Cruz, Santa Cruz, CA, United States, (6)UNESP Sao Paulo State University, Rio Claro, Brazil