Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean
International audience Elasmobranchs, and particularly skates (Rajiforms), are commonly caught in fisheries worldwide as targeted catch or bycatch. Their life history traits make them particularly sensitive to elevated fishing mortality, especially in slow-growing deep-sea species. Knowledge of thei...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2023
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Subjects: | |
Online Access: | https://hal.science/hal-03988297 https://doi.org/10.1016/j.dsr.2023.103980 |
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ftunivbrest:oai:HAL:hal-03988297v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
Trophic niche Top predators Bathyraja Stable isotopes DNA barcoding Stomach contents [SDE]Environmental Sciences |
spellingShingle |
Trophic niche Top predators Bathyraja Stable isotopes DNA barcoding Stomach contents [SDE]Environmental Sciences Faure, Johanna Gasco, Nicolas Bonillo, Céline Munaron, Jean-Marie Cherel, Yves Péron, Clara Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean |
topic_facet |
Trophic niche Top predators Bathyraja Stable isotopes DNA barcoding Stomach contents [SDE]Environmental Sciences |
description |
International audience Elasmobranchs, and particularly skates (Rajiforms), are commonly caught in fisheries worldwide as targeted catch or bycatch. Their life history traits make them particularly sensitive to elevated fishing mortality, especially in slow-growing deep-sea species. Knowledge of their ecology is key to ensure effective conservation and mitigation measures, especially dietary references to understand trophic relationships within the ecosystem. This study presents the first comprehensive description of diet composition and trophic position of two skate species (Bathyraja eatonii and B. irrasa) caught as bycatch in the French Patagonian toothfish (Dissostichus eleginoides) fishery in the Indian sector of the Southern Ocean (Kerguelen waters). Stomach content and stable isotopic analyses were performed on both species according to sex and maturity stage. DNA barcoding analysis was performed on prey tissue samples to identify or confirm identification of prey items found in stomachs. Overall, both skate species were generalist feeders with high δ15N values. The higher δ15N values of B. irrasa result in a higher estimated trophic position than B. eatonii. The diet of B. eatonii mainly consisted of fish, pelagic crustaceans and squids, while B. irrasa preyed more on benthic crustaceans, fish and annelids. While sex had no effect on diet and trophic position for both species, maturity stage influenced the prey composition of B. irrasa. Annelids and isopods were prevalent in the stomachs of immature individuals of B. irrasa, while mature individuals fed more on decapods and fish. Our results revealed a wide range of prey items for these two generalist predators (>57 species). Understanding the diet, trophic position and trophic relationships of B. eatonii and B. irrasa is critical to a better comprehension of the impact of the exploitation of top predators on the subantarctic demersal ecosystem. |
author2 |
Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
format |
Article in Journal/Newspaper |
author |
Faure, Johanna Gasco, Nicolas Bonillo, Céline Munaron, Jean-Marie Cherel, Yves Péron, Clara |
author_facet |
Faure, Johanna Gasco, Nicolas Bonillo, Céline Munaron, Jean-Marie Cherel, Yves Péron, Clara |
author_sort |
Faure, Johanna |
title |
Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean |
title_short |
Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean |
title_full |
Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean |
title_fullStr |
Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean |
title_full_unstemmed |
Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean |
title_sort |
feeding ecology of two deep-sea skates bycaught on demersal longlines off kerguelen islands, southern indian ocean |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-03988297 https://doi.org/10.1016/j.dsr.2023.103980 |
geographic |
Southern Ocean Kerguelen Kerguelen Islands Indian |
geographic_facet |
Southern Ocean Kerguelen Kerguelen Islands Indian |
genre |
Kerguelen Islands Patagonian Toothfish Southern Ocean |
genre_facet |
Kerguelen Islands Patagonian Toothfish Southern Ocean |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-03988297 Deep Sea Research Part I: Oceanographic Research Papers, 2023, 194, pp.103980. ⟨10.1016/j.dsr.2023.103980⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2023.103980 hal-03988297 https://hal.science/hal-03988297 doi:10.1016/j.dsr.2023.103980 WOS: 000995847600001 |
op_doi |
https://doi.org/10.1016/j.dsr.2023.103980 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
194 |
container_start_page |
103980 |
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1796312503749181440 |
spelling |
ftunivbrest:oai:HAL:hal-03988297v1 2024-04-14T08:14:19+00:00 Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean Faure, Johanna Gasco, Nicolas Bonillo, Céline Munaron, Jean-Marie Cherel, Yves Péron, Clara Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2023-04 https://hal.science/hal-03988297 https://doi.org/10.1016/j.dsr.2023.103980 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2023.103980 hal-03988297 https://hal.science/hal-03988297 doi:10.1016/j.dsr.2023.103980 WOS: 000995847600001 ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://hal.science/hal-03988297 Deep Sea Research Part I: Oceanographic Research Papers, 2023, 194, pp.103980. ⟨10.1016/j.dsr.2023.103980⟩ Trophic niche Top predators Bathyraja Stable isotopes DNA barcoding Stomach contents [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2023 ftunivbrest https://doi.org/10.1016/j.dsr.2023.103980 2024-03-21T16:24:19Z International audience Elasmobranchs, and particularly skates (Rajiforms), are commonly caught in fisheries worldwide as targeted catch or bycatch. Their life history traits make them particularly sensitive to elevated fishing mortality, especially in slow-growing deep-sea species. Knowledge of their ecology is key to ensure effective conservation and mitigation measures, especially dietary references to understand trophic relationships within the ecosystem. This study presents the first comprehensive description of diet composition and trophic position of two skate species (Bathyraja eatonii and B. irrasa) caught as bycatch in the French Patagonian toothfish (Dissostichus eleginoides) fishery in the Indian sector of the Southern Ocean (Kerguelen waters). Stomach content and stable isotopic analyses were performed on both species according to sex and maturity stage. DNA barcoding analysis was performed on prey tissue samples to identify or confirm identification of prey items found in stomachs. Overall, both skate species were generalist feeders with high δ15N values. The higher δ15N values of B. irrasa result in a higher estimated trophic position than B. eatonii. The diet of B. eatonii mainly consisted of fish, pelagic crustaceans and squids, while B. irrasa preyed more on benthic crustaceans, fish and annelids. While sex had no effect on diet and trophic position for both species, maturity stage influenced the prey composition of B. irrasa. Annelids and isopods were prevalent in the stomachs of immature individuals of B. irrasa, while mature individuals fed more on decapods and fish. Our results revealed a wide range of prey items for these two generalist predators (>57 species). Understanding the diet, trophic position and trophic relationships of B. eatonii and B. irrasa is critical to a better comprehension of the impact of the exploitation of top predators on the subantarctic demersal ecosystem. Article in Journal/Newspaper Kerguelen Islands Patagonian Toothfish Southern Ocean Université de Bretagne Occidentale: HAL Southern Ocean Kerguelen Kerguelen Islands Indian Deep Sea Research Part I: Oceanographic Research Papers 194 103980 |