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Pàgina inicial > Articles > Articles publicats > Bottom-trawling along submarine canyons impacts deep sedimentary regimes |
Data: | 2017 |
Resum: | Many 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-20th 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. |
Ajuts: | European Commission 287600 European Commission 226354 Ministerio de Economía y Competitividad CTM2015-65142-R Ministerio de Economía y Competitividad MDM2015-0552 Ministerio de Economía y Competitividad CGL2012-33989 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014 SGR-1356 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1642 |
Nota: | Unidad de excelencia María de Maeztu MdM-2015-0552 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Publicat a: | Scientific reports, Vol. 7 (Feb. 2017) , ART. a43332, ISSN 2045-2322 |
12 p, 2.0 MB |