Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities

Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities

2014 American Geophysical Union Fall Meeting, 15-19 december 2014, San Francisco

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Main Authors: Puig, Pere, Masqué, Pere, Martín, Jacobo, Paradis Vilar, Sarah, Toro, Miguel, Palanques, Albert
Format: comunicación de congreso biblioteca
Published: American Geophysical Union
Online Access:http://hdl.handle.net/10261/128112
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spelling dig-icm-es-10261-1281122019-03-06T13:55:37Z Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities Puig, Pere Masqué, Pere Martín, Jacobo Paradis Vilar, Sarah Toro, Miguel Palanques, Albert 2014 American Geophysical Union Fall Meeting, 15-19 december 2014, San Francisco The physical disturbance of the marine sedimentary environments by commercial bottom trawling is a matter of concern. The direct physical effects of this fishing technique include scraping and ploughing of the seabed and increases of the near-bottom water turbidity by sediment resuspension. However, the quantification of the sediment that has been resuspended by this anthropogenic activity over years and has been ultimately exported across the margin remains largely unaddressed. The analysis of sediment accumulation rates from sediment cores collected along the axes of several submarine canyons in the Catalan margin (northwestern Mediterranean) has allowed to estimate the contribution of this anthropogenic activity to the present-day sediment dynamics. 210Pb chronologies, occasionally supported by 137Cs dating, indicate a rapid increase of sediment accumulation rates since the 1970s, in coincidence with a strong impulse in the industrialization of the trawling fleets of this region. Such increase has been associated to the enhanced delivery of sediment resuspended by trawlers from the shelves and upper slope regions towards the canyon's interior, and to the rapid technical development at that time, in terms of engine power and gear size. This change has been observed in La Fonera (or Palamós) Canyon at depths greater than 1700 m, while in other canyons it is restricted to shallower regions (~1000 m in depth) closer to fishing grounds. Two sampling sites from La Fonera and Foix submarine canyons that exhibited high sediment accumulation rates (0.6-0.7 cm/y) were reoccupied several years after the first chronological analyses. These two new cores reveal a second and more rapid increase of sediment accumulation rates in both canyons occurring circa 2002 and accounting for about 2 cm/y. This second change at the beginning of the XXI century has been attributed to a preferential displacement of the trawling fleet towards slope fishing grounds surrounding submarine canyons, and also to technical improvements in trawling vessels, presumably related to subsidies and aids provided by the European Commission to the fishing industry. Peer Reviewed 2014-12-16 2016-01-26T09:26:42Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 2014 AGU Fall Meeting (2014) http://hdl.handle.net/10261/128112 https://agu.confex.com/agu/fm14/meetingapp.cgi/Paper/9208 Sí none American Geophysical Union
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
description 2014 American Geophysical Union Fall Meeting, 15-19 december 2014, San Francisco
format comunicación de congreso
author Puig, Pere
Masqué, Pere
Martín, Jacobo
Paradis Vilar, Sarah
Toro, Miguel
Palanques, Albert
spellingShingle Puig, Pere
Masqué, Pere
Martín, Jacobo
Paradis Vilar, Sarah
Toro, Miguel
Palanques, Albert
Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities
author_facet Puig, Pere
Masqué, Pere
Martín, Jacobo
Paradis Vilar, Sarah
Toro, Miguel
Palanques, Albert
author_sort Puig, Pere
title Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities
title_short Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities
title_full Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities
title_fullStr Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities
title_full_unstemmed Rapid Changes on Sediment Accumulation Rates within Submarine Canyons Caused By Bottom Trawling Activities
title_sort rapid changes on sediment accumulation rates within submarine canyons caused by bottom trawling activities
publisher American Geophysical Union
url http://hdl.handle.net/10261/128112
work_keys_str_mv AT puigpere rapidchangesonsedimentaccumulationrateswithinsubmarinecanyonscausedbybottomtrawlingactivities
AT masquepere rapidchangesonsedimentaccumulationrateswithinsubmarinecanyonscausedbybottomtrawlingactivities
AT martinjacobo rapidchangesonsedimentaccumulationrateswithinsubmarinecanyonscausedbybottomtrawlingactivities
AT paradisvilarsarah rapidchangesonsedimentaccumulationrateswithinsubmarinecanyonscausedbybottomtrawlingactivities
AT toromiguel rapidchangesonsedimentaccumulationrateswithinsubmarinecanyonscausedbybottomtrawlingactivities
AT palanquesalbert rapidchangesonsedimentaccumulationrateswithinsubmarinecanyonscausedbybottomtrawlingactivities
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