Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity

Numerous submarine canyons around the world are preferential conduits for episodic dense shelf water cascading (DSWC), which quickly modifies physical and chemical ambient conditions while transporting large amounts of material towards the base of slope and basin. Observations conducted during the l...

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Autores: Pusceddu, Antonio, Mea, M., Canals Artigas, Miquel, Heussner, Serge, Durrieu de Madron, Xavier, Sanchez-Vidal, Anna, Bianchelli, S., Corinaldesi, Cinzia, Dell'Anno, Antonio, Thomsen, L., Danovaro, Roberto
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/98765
Acceso en línea:https://hdl.handle.net/2445/98765
Access Level:acceso abierto
Palabra clave:Fons marins
Biodiversitat
Ecosistemes
Ocean bottom
Biodiversity
Biotic communities
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spelling Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversityPusceddu, AntonioMea, M.Canals Artigas, MiquelHeussner, SergeDurrieu de Madron, XavierSanchez-Vidal, AnnaBianchelli, S.Corinaldesi, CinziaDell'Anno, AntonioThomsen, L.Danovaro, RobertoFons marinsBiodiversitatEcosistemesOcean bottomBiodiversityBiotic communitiesNumerous submarine canyons around the world are preferential conduits for episodic dense shelf water cascading (DSWC), which quickly modifies physical and chemical ambient conditions while transporting large amounts of material towards the base of slope and basin. Observations conducted during the last 20 yr in the Lacaze-Duthiers and Cap de Creus canyons (Gulf of Lion, NW Mediterranean Sea) report several intense DSWC events. The effects of DSWC on deep-sea ecosystems are almost unknown. To investigate the effects of these episodic events, we analysed changes in the meiofaunal biodiversity inside and outside the canyon. Sediment samples were collected at depths varying from ca. 1000 to > 2100 m in May 2004 (before a major event), April 2005 (during a major cascading event) and in October 2005, August 2006, April 2008 and April 2009 (after a major event). We report here that the late winter-early spring 2005 cascading led to a reduction of the organic matter contents in canyon floor sediments down to 1800 m depth, whereas surface sediments at about 2200 m depth showed an increase. Our findings suggest that the nutritional material removed from the shallower continental shelf, canyon floor and flanks, and also the adjacent open slope was rapidly transported to the deep margin. During the cascading event the meiofaunal abundance and biodiversity in the studied deep-sea sediments were significantly lower than after the event. Benthic assemblages during the cascading were significantly different from those in all other sampling periods in both the canyon and deep margin. After only six months from the cessation of the cascading, benthic assemblages in the impacted sediments were again similar to those observed in other sampling periods, thus illustrating a quick recovery. Since the present climate change is expected to increase the intensity and frequency of these episodic events, we anticipate that they will increasingly affect benthic bathyal ecosystems, which may eventually challenge their resilience.European Geosciences Union (EGU)2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/98765Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésinfo:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-2659-2013Reproducció del document publicat a: http://dx.doi.org/10.5194/bg-10-2659-2013Biogeosciences, 2013, vol. 10, num. 4, p. 2659-2670http://dx.doi.org/10.5194/bg-10-2659-2013info:eu-repo/grantAgreement/EC/FP7/226354cc-by (c) Pusceddu, A. et al., 2013http://creativecommons.org/licenses/by/3.0/esinfo:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/987652026-05-27T06:46:51Z
dc.title.none.fl_str_mv Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity
title Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity
spellingShingle Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity
Pusceddu, Antonio
Fons marins
Biodiversitat
Ecosistemes
Ocean bottom
Biodiversity
Biotic communities
title_short Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity
title_full Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity
title_fullStr Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity
title_full_unstemmed Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity
title_sort Major consequences of an intense dense shelf water cascading event on deep-sea benthic trophic conditions and meiofaunal biodiversity
dc.creator.none.fl_str_mv Pusceddu, Antonio
Mea, M.
Canals Artigas, Miquel
Heussner, Serge
Durrieu de Madron, Xavier
Sanchez-Vidal, Anna
Bianchelli, S.
Corinaldesi, Cinzia
Dell'Anno, Antonio
Thomsen, L.
Danovaro, Roberto
author Pusceddu, Antonio
author_facet Pusceddu, Antonio
Mea, M.
Canals Artigas, Miquel
Heussner, Serge
Durrieu de Madron, Xavier
Sanchez-Vidal, Anna
Bianchelli, S.
Corinaldesi, Cinzia
Dell'Anno, Antonio
Thomsen, L.
Danovaro, Roberto
author_role author
author2 Mea, M.
Canals Artigas, Miquel
Heussner, Serge
Durrieu de Madron, Xavier
Sanchez-Vidal, Anna
Bianchelli, S.
Corinaldesi, Cinzia
Dell'Anno, Antonio
Thomsen, L.
Danovaro, Roberto
author2_role author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Fons marins
Biodiversitat
Ecosistemes
Ocean bottom
Biodiversity
Biotic communities
topic Fons marins
Biodiversitat
Ecosistemes
Ocean bottom
Biodiversity
Biotic communities
description Numerous submarine canyons around the world are preferential conduits for episodic dense shelf water cascading (DSWC), which quickly modifies physical and chemical ambient conditions while transporting large amounts of material towards the base of slope and basin. Observations conducted during the last 20 yr in the Lacaze-Duthiers and Cap de Creus canyons (Gulf of Lion, NW Mediterranean Sea) report several intense DSWC events. The effects of DSWC on deep-sea ecosystems are almost unknown. To investigate the effects of these episodic events, we analysed changes in the meiofaunal biodiversity inside and outside the canyon. Sediment samples were collected at depths varying from ca. 1000 to > 2100 m in May 2004 (before a major event), April 2005 (during a major cascading event) and in October 2005, August 2006, April 2008 and April 2009 (after a major event). We report here that the late winter-early spring 2005 cascading led to a reduction of the organic matter contents in canyon floor sediments down to 1800 m depth, whereas surface sediments at about 2200 m depth showed an increase. Our findings suggest that the nutritional material removed from the shallower continental shelf, canyon floor and flanks, and also the adjacent open slope was rapidly transported to the deep margin. During the cascading event the meiofaunal abundance and biodiversity in the studied deep-sea sediments were significantly lower than after the event. Benthic assemblages during the cascading were significantly different from those in all other sampling periods in both the canyon and deep margin. After only six months from the cessation of the cascading, benthic assemblages in the impacted sediments were again similar to those observed in other sampling periods, thus illustrating a quick recovery. Since the present climate change is expected to increase the intensity and frequency of these episodic events, we anticipate that they will increasingly affect benthic bathyal ecosystems, which may eventually challenge their resilience.
publishDate 2013
dc.date.none.fl_str_mv 2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/98765
url https://hdl.handle.net/2445/98765
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-2659-2013
Reproducció del document publicat a: http://dx.doi.org/10.5194/bg-10-2659-2013
Biogeosciences, 2013, vol. 10, num. 4, p. 2659-2670
http://dx.doi.org/10.5194/bg-10-2659-2013
info:eu-repo/grantAgreement/EC/FP7/226354
dc.rights.none.fl_str_mv cc-by (c) Pusceddu, A. et al., 2013
http://creativecommons.org/licenses/by/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Pusceddu, A. et al., 2013
http://creativecommons.org/licenses/by/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv European Geosciences Union (EGU)
publisher.none.fl_str_mv European Geosciences Union (EGU)
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300724

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