Natural and marine environment
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Browsing Natural and marine environment by Author "Amoroso, Ricardo O."
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Item Bottom trawl fishing footprints on the world’s continental shelves(National Academy of Sciences, 2018-10-08) Amoroso, Ricardo O.; Pitcher, C. Roland; Rijnsdorp, Adriaan D.; McConnaughey, Robert A.; Parma, Ana M.; Suuronen, Petri; Eigaard, Ole R.; Bastardie, Francois; Hintzen, Niels T.; Althaus, Franziska; Baird, Susan Jane; Black, Jenny; Buhl-Mortensen, Lene; Campbell, Alexander B.; Catarino, Rui; Collie, Jeremy; Cowan Jr., James H.; Durholtz, Deon; Engstrom, Nadia; Fairweather, Tracey P.; Fock, Heino O.; Ford, Richard; Gálvez, Patricio A.; Gerritsen, Hans; Góngora, María Eva; González, Jessica A.; Hiddink, Jan G.; Hughes, Kathryn M.; Intelmann, Steven S.; Jenkins, Chris; Jonsson, Patrik; Kainge, Paulus; Kangas, Mervi; Kathena, Johannes N.; Kavadas, Stefanos; Leslie, Rob W.; Lewis, Steve G.; Lundy, Mathieu; Makin, David; Martin, Julie; Mazor, Tessa; Gonzalez-Mirelis, Genoveva; Newman, Stephen J.; Papadopoulou, Nadia; Posen, Paulette E.; Rochester, Wayne; Russo, Tommaso; Sala, Antonello; Semmens, Jayson M.; Silva, Cristina; Tsolos, Angelo; Vanelslander, Bart; Wakefield, Corey B.; Wood, Brent A.; Hilborn, Ray; Kaiser, Michel J.; Jennings, SimonBottom trawlers land around 19 million tons of fish and invertebrates annually, almost one-quarter of wild marine landings. The extent of bottom trawling footprint (seabed area trawled at least once in a specified region and time period) is often contested but poorly described. We quantify footprints using high-resolution satellite vessel monitoring system (VMS) and logbook data on 24 continental shelves and slopes to 1,000-m depth over at least 2 years. Trawling footprint varied markedly among regions: from <10% of seabed area in Australian and New Zealand waters, the Aleutian Islands, East Bering Sea, South Chile, and Gulf of Alaska to >50% in some European seas. Overall, 14% of the 7.8 million-km2 study area was trawled, and 86% was not trawled. Trawling activity was aggregated; the most intensively trawled areas accounting for 90% of activity comprised 77% of footprint on average. Regional swept area ratio (SAR; ratio of total swept area trawled annually to total area of region, a metric of trawling intensity) and footprint area were related, providing an approach to estimate regional trawling footprints when highresolution spatial data are unavailable. If SAR was ≤0.1, as in 8 of 24 regions, therewas >95% probability that >90%of seabed was not trawled. If SAR was 7.9, equal to the highest SAR recorded, there was >95% probability that >70% of seabed was trawled. Footprints were smaller and SAR was ≤0.25 in regions where fishing rates consistently met international sustainability benchmarks for fish stocks, implying collateral environmental benefits from sustainable fishing.