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...
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Elsevier BV
2022
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Online Access: | https://archimer.ifremer.fr/doc/00750/86170/91411.pdf https://doi.org/10.1016/j.dsr.2022.103708 https://archimer.ifremer.fr/doc/00750/86170/ |
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ftarchimer:oai:archimer.ifremer.fr:86170 2023-05-15T17:10:43+02:00 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, Loic Pinte, Nicolas Lepoint, Gilles Schaal, Gauthier Vieira, Rui P. Gonçalves, Jorge M.s. Martin, Ulrich Mallefet, Jérôme 2022-04 application/pdf https://archimer.ifremer.fr/doc/00750/86170/91411.pdf https://doi.org/10.1016/j.dsr.2022.103708 https://archimer.ifremer.fr/doc/00750/86170/ eng eng Elsevier BV https://archimer.ifremer.fr/doc/00750/86170/91411.pdf doi:10.1016/j.dsr.2022.103708 https://archimer.ifremer.fr/doc/00750/86170/ info:eu-repo/semantics/openAccess restricted use Deep-sea Research Part I-oceanographic Research Papers (0967-0637) (Elsevier BV), 2022-04 , Vol. 182 , P. 103708 (11p.) Trophic ecology Stable isotopes Stomach content Mesopredator Food webs Benthopelagic predator text Publication info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.1016/j.dsr.2022.103708 2023-02-07T23:52:15Z 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 Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) 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 |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Trophic ecology Stable isotopes Stomach content Mesopredator Food webs Benthopelagic predator |
spellingShingle |
Trophic ecology Stable isotopes Stomach content Mesopredator Food webs Benthopelagic predator Besnard, Lucien Duchatelet, Laurent Bird, Christopher S. Le Croizier, Gaël Michel, Loic 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 |
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. |
format |
Article in Journal/Newspaper |
author |
Besnard, Lucien Duchatelet, Laurent Bird, Christopher S. Le Croizier, Gaël Michel, Loic 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, Loic 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 |
Elsevier BV |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00750/86170/91411.pdf https://doi.org/10.1016/j.dsr.2022.103708 https://archimer.ifremer.fr/doc/00750/86170/ |
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 I-oceanographic Research Papers (0967-0637) (Elsevier BV), 2022-04 , Vol. 182 , P. 103708 (11p.) |
op_relation |
https://archimer.ifremer.fr/doc/00750/86170/91411.pdf doi:10.1016/j.dsr.2022.103708 https://archimer.ifremer.fr/doc/00750/86170/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
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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1766067363086598144 |