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Bottom-trawling along submarine canyons impacts deep sedimentary regimes

AuthorsParadis Vilar, Sarah; Puig, Pere ; Masqué, Pere; Juan Díaz, Xènia; Martín, Jacobo ; Palanques, Albert
Issue DateFeb-2017
PublisherNature Publishing Group
CitationScientific Reports 7: 43332 (2017)
AbstractMany studies highlight that fish trawling activities cause seafloor erosion, but the assessment of the remobilization of surface sediments and its relocation is still not well documented. These impacts were examined along the flanks and axes of three headless submarine canyons incised on the Barcelona continental margin, where trawling fleets have been operating for decades. Trawled grounds along canyon flanks presented eroded and highly reworked surface sediments resulting from the passage of heavy trawling gear. Sedimentation rates on the upper canyon axes tripled and quadrupled its natural (i.e. pre-industrialization) values after a substantial increase in total horsepower of the operating trawling fleets between 1960s and 1970s. These impacts affected the upper canyon reaches next to fishing grounds, where sediment resuspended by trawling can be transported towards the canyon axes. This study highlights that bottom trawling has the capacity to alter natural sedimentary environments by promoting sediment-starved canyon flanks, and by enhancing sedimentation rates along the contiguous axes, independently of canyons' morphology. Considering the global mechanisation and offshore expansion of bottom trawling fisheries since the mid-20 century, these sedimentary alterations may occur in many trawled canyons worldwide, with further ecological impacts on the trophic status of these non-resilient benthic communities
Description11 pages, 6 figures, 1 table, supplementary information https://dx.doi.org/10.1038/srep43332.-- Corrigendum: Bottom-trawling along submarine canyons impacts deep sedimentary regimes Scientific Reports 7: 46903 (2017) doi:10.1038/srep46903
Publisher version (URL)https://doi.org/10.1038/srep43332
Identifiersdoi: 10.1038/srep43332
issn: 2045-2322
e-issn: 2045-2322
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