Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea
Deep-sea elasmobranchs are commonly reported as bycatch of deep-sea fisheries and their subsequent loss has been highlighted as a long-running concern to the ecosystem ecological functioning. To understand the possible consequences of their removal, information on basic ecological traits, such as di...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Language: | English |
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2022
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Online Access: | http://hdl.handle.net/2078.1/259928 https://doi.org/10.1016/j.dsr.2022.103708 |
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:259928 2024-05-12T08:06:51+00:00 Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea Besnard, Lucien Duchatelet, Laurent Bird, Christopher S. Le Croizier, Gaël Michel, Loïc Pinte, Nicolas Lepoint, Gilles Schaal, Gauthier Vieira, Rui P. Gonçalves, Jorge M.S. Martin, Ulrich Mallefet, Jérôme UCL - SST/ELI/ELIB - Biodiversity 2022 http://hdl.handle.net/2078.1/259928 https://doi.org/10.1016/j.dsr.2022.103708 eng eng Pergamon boreal:259928 http://hdl.handle.net/2078.1/259928 doi:10.1016/j.dsr.2022.103708 urn:ISSN:0967-0637 urn:EISSN:1879-0119 info:eu-repo/semantics/openAccess Deep-Sea Research. Part 1: Oceanographic Research Papers, Vol. 182, p. 103708 (2022) Aquatic Science Oceanography Trophic ecology Stable isotopes Stomach content Mesopredator Food webs Benthopelagic predator info:eu-repo/semantics/article 2022 ftunistlouisbrus https://doi.org/10.1016/j.dsr.2022.103708 2024-04-18T17:13:21Z Deep-sea elasmobranchs are commonly reported as bycatch of deep-sea fisheries and their subsequent loss has been highlighted as a long-running concern to the ecosystem ecological functioning. To understand the possible consequences of their removal, information on basic ecological traits, such as diet and foraging strategies, is needed. Such aspects have been widely studied through stomach content analysis but the lack of long-term dietary information requires other tools to be used such as stable isotopes. This study examines nitrogen and carbon isotope compositions of the velvet belly lantern shark, Etmopterus spinax, one of the most impacted shark species in northeastern Atlantic fisheries as a result of accidental catches. E. spinax was sampled at four different locations, characterized by contrasting oceanographic and ecological conditions: the western Mediterranean Sea (near the Balearic Islands), the southern Iberian upwelling system, Rockall Trough and southwestern Norwegian fjords. Stomach content analysis revealed similar prey species among sites, with a diet dominated by Euphausiacea (mostly Meganyctiphanes norvegica) and an ontogenetic shift towards small teleost fishes, cephalopods or other crustaceans. Despite these similarities, muscle stable isotope compositions differed across sampled locations. Rather than clear dietary differences, the contrasted isotopic values are likely to reflect differences in environmental settings and biogeochemical processes affecting nutrient dynamics at the base of the food webs. Article in Journal/Newspaper Meganyctiphanes norvegica DIAL@USL-B (Université Saint-Louis, Bruxelles) Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Deep Sea Research Part I: Oceanographic Research Papers 182 103708 |
institution |
Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
op_collection_id |
ftunistlouisbrus |
language |
English |
topic |
Aquatic Science Oceanography Trophic ecology Stable isotopes Stomach content Mesopredator Food webs Benthopelagic predator |
spellingShingle |
Aquatic Science Oceanography Trophic ecology Stable isotopes Stomach content Mesopredator Food webs Benthopelagic predator Besnard, Lucien Duchatelet, Laurent Bird, Christopher S. Le Croizier, Gaël Michel, Loïc Pinte, Nicolas Lepoint, Gilles Schaal, Gauthier Vieira, Rui P. Gonçalves, Jorge M.S. Martin, Ulrich Mallefet, Jérôme Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea |
topic_facet |
Aquatic Science Oceanography Trophic ecology Stable isotopes Stomach content Mesopredator Food webs Benthopelagic predator |
description |
Deep-sea elasmobranchs are commonly reported as bycatch of deep-sea fisheries and their subsequent loss has been highlighted as a long-running concern to the ecosystem ecological functioning. To understand the possible consequences of their removal, information on basic ecological traits, such as diet and foraging strategies, is needed. Such aspects have been widely studied through stomach content analysis but the lack of long-term dietary information requires other tools to be used such as stable isotopes. This study examines nitrogen and carbon isotope compositions of the velvet belly lantern shark, Etmopterus spinax, one of the most impacted shark species in northeastern Atlantic fisheries as a result of accidental catches. E. spinax was sampled at four different locations, characterized by contrasting oceanographic and ecological conditions: the western Mediterranean Sea (near the Balearic Islands), the southern Iberian upwelling system, Rockall Trough and southwestern Norwegian fjords. Stomach content analysis revealed similar prey species among sites, with a diet dominated by Euphausiacea (mostly Meganyctiphanes norvegica) and an ontogenetic shift towards small teleost fishes, cephalopods or other crustaceans. Despite these similarities, muscle stable isotope compositions differed across sampled locations. Rather than clear dietary differences, the contrasted isotopic values are likely to reflect differences in environmental settings and biogeochemical processes affecting nutrient dynamics at the base of the food webs. |
author2 |
UCL - SST/ELI/ELIB - Biodiversity |
format |
Article in Journal/Newspaper |
author |
Besnard, Lucien Duchatelet, Laurent Bird, Christopher S. Le Croizier, Gaël Michel, Loïc Pinte, Nicolas Lepoint, Gilles Schaal, Gauthier Vieira, Rui P. Gonçalves, Jorge M.S. Martin, Ulrich Mallefet, Jérôme |
author_facet |
Besnard, Lucien Duchatelet, Laurent Bird, Christopher S. Le Croizier, Gaël Michel, Loïc Pinte, Nicolas Lepoint, Gilles Schaal, Gauthier Vieira, Rui P. Gonçalves, Jorge M.S. Martin, Ulrich Mallefet, Jérôme |
author_sort |
Besnard, Lucien |
title |
Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea |
title_short |
Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea |
title_full |
Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea |
title_fullStr |
Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea |
title_full_unstemmed |
Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea |
title_sort |
diet consistency but large-scale isotopic variations in a deep-sea shark: the case of the velvet belly lantern shark, etmopterus spinax, in the northeastern atlantic region and mediterranean sea |
publisher |
Pergamon |
publishDate |
2022 |
url |
http://hdl.handle.net/2078.1/259928 https://doi.org/10.1016/j.dsr.2022.103708 |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) |
geographic |
Rockall Trough |
geographic_facet |
Rockall Trough |
genre |
Meganyctiphanes norvegica |
genre_facet |
Meganyctiphanes norvegica |
op_source |
Deep-Sea Research. Part 1: Oceanographic Research Papers, Vol. 182, p. 103708 (2022) |
op_relation |
boreal:259928 http://hdl.handle.net/2078.1/259928 doi:10.1016/j.dsr.2022.103708 urn:ISSN:0967-0637 urn:EISSN:1879-0119 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2022.103708 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
182 |
container_start_page |
103708 |
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1798849376792084480 |