Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling

Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling

2018 Ocean Sciences Meeting, 11-16 February, in Portland, Oregon

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Main Authors: Paradis Vilar, Sarah, Puig, Pere, Sánchez-Vidal, Anna, Masqué, Pere, García-Orellana, Jordi, Calafat, Antoni, Canals, Miquel
Format: póster de congreso biblioteca
Published: American Geophysical Union 2018-02-11
Online Access:http://hdl.handle.net/10261/185956
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spelling dig-icm-es-10261-1859562019-07-12T07:15:49Z Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling Paradis Vilar, Sarah Puig, Pere Sánchez-Vidal, Anna Masqué, Pere García-Orellana, Jordi Calafat, Antoni Canals, Miquel 2018 Ocean Sciences Meeting, 11-16 February, in Portland, Oregon A comprehensive study of 15 sediment cores from the Blanes Canyon area was conducted to understand natural sedimentary processes and alterations caused by bottom trawling. Canyon axis and flanks, as well as adjacent open slope areas were sampled at depths ranging from 300 m to 2200 m. Grain size, dry bulk density and 210Pb concentration profiles were analyzed to obtain sediment properties and to study possible changes on sedimentation rates over the last century attributed to bottom trawling. The passage of trawling gear lead to eroded and disturbed surface sediments, altering the natural sedimentation rates within the canyon axis. Thus, shallower depths at the canyon axis (900-1200 m) presented considerably high sedimentation rates (0.9-2.1 cm·yr-1) accumulated after the 1970s. Further downcanyon, sedimentation rates increased two- to fourfold after this decade, from 0.1-0.2 cm·yr-1 to 0.2-0.8 cm·yr-1. This enhanced sedimentation is attributed to the resuspension and subsequent transport of sediments caused by the expansion of the operating trawling fleets at that time. These impacts are localized downslope from fishing grounds, and the anthropogenically-enhanced sedimentation rates decreased downcanyon at a greater distance from trawling grounds. On the lower continental slope (900-1500 m) and in the canyon axis (1500-2200 m), natural sedimentation rates (pre-1970s) were similar in both environments, indicating that sediment deposition at those depths is governed by the offshore distance from the continental sediment inputs. These results are a manifest of the capacity of trawling activities to erode flanks and rims of the Blanes Canyon and remobilize large amounts of sediments towards its interior, ultimately enhancing sedimentation rates along the canyon axis. While submarine canyons have been regarded as preferential conduits of particulate matter, they should also be considered depocenters of trawling-induced resuspended sediments Peer Reviewed 2019-07-11T11:56:13Z 2019-07-11T11:56:13Z 2018-02-11 2019-07-11T11:56:13Z póster de congreso http://purl.org/coar/resource_type/c_6670 2018 Ocean Sciences Meeting (2018) http://hdl.handle.net/10261/185956 https://agu.confex.com/agu/os18/meetingapp.cgi/Paper/308583 Sí none American Geophysical Union Association for the Sciences of Limnology and Oceanography
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 2018 Ocean Sciences Meeting, 11-16 February, in Portland, Oregon
format póster de congreso
author Paradis Vilar, Sarah
Puig, Pere
Sánchez-Vidal, Anna
Masqué, Pere
García-Orellana, Jordi
Calafat, Antoni
Canals, Miquel
spellingShingle Paradis Vilar, Sarah
Puig, Pere
Sánchez-Vidal, Anna
Masqué, Pere
García-Orellana, Jordi
Calafat, Antoni
Canals, Miquel
Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling
author_facet Paradis Vilar, Sarah
Puig, Pere
Sánchez-Vidal, Anna
Masqué, Pere
García-Orellana, Jordi
Calafat, Antoni
Canals, Miquel
author_sort Paradis Vilar, Sarah
title Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling
title_short Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling
title_full Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling
title_fullStr Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling
title_full_unstemmed Sediment Accumulation Records in Blanes Canyon (NW Mediterranean): Anthropogenic Disturbance Caused by Bottom Trawling
title_sort sediment accumulation records in blanes canyon (nw mediterranean): anthropogenic disturbance caused by bottom trawling
publisher American Geophysical Union
publishDate 2018-02-11
url http://hdl.handle.net/10261/185956
work_keys_str_mv AT paradisvilarsarah sedimentaccumulationrecordsinblanescanyonnwmediterraneananthropogenicdisturbancecausedbybottomtrawling
AT puigpere sedimentaccumulationrecordsinblanescanyonnwmediterraneananthropogenicdisturbancecausedbybottomtrawling
AT sanchezvidalanna sedimentaccumulationrecordsinblanescanyonnwmediterraneananthropogenicdisturbancecausedbybottomtrawling
AT masquepere sedimentaccumulationrecordsinblanescanyonnwmediterraneananthropogenicdisturbancecausedbybottomtrawling
AT garciaorellanajordi sedimentaccumulationrecordsinblanescanyonnwmediterraneananthropogenicdisturbancecausedbybottomtrawling
AT calafatantoni sedimentaccumulationrecordsinblanescanyonnwmediterraneananthropogenicdisturbancecausedbybottomtrawling
AT canalsmiquel sedimentaccumulationrecordsinblanescanyonnwmediterraneananthropogenicdisturbancecausedbybottomtrawling
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