Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean
International audience We report the trophic structure of a myctophid assemblage by measuring the isotopic niches of 14 species living in Kerguelen waters, southern Indian Ocean. Most of the species show distinct isotopic niches that differ by at least one of the two niche axes (d13C habitat and d15...
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ftunivnantes:oai:HAL:hal-00528576v1 2023-05-15T18:25:37+02:00 Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean Cherel, Yves Fontaine, Camille Richard, Pierre Labat, Jean-Philippe Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Océanographie Biologique et Écologie du Plancton Marin (LOBEPM) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2010-10-22 https://hal.science/hal-00528576 https://doi.org/10.4319/lo.2010.55.1.0324 en eng HAL CCSD Association for the Sciences of Limnology and Oceanography info:eu-repo/semantics/altIdentifier/doi/10.4319/lo.2010.55.1.0324 hal-00528576 https://hal.science/hal-00528576 doi:10.4319/lo.2010.55.1.0324 ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.science/hal-00528576 Limnology and Oceanography, 2010, 55 (1), pp.324-332. ⟨10.4319/lo.2010.55.1.0324⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2010 ftunivnantes https://doi.org/10.4319/lo.2010.55.1.0324 2023-03-08T00:24:53Z International audience We report the trophic structure of a myctophid assemblage by measuring the isotopic niches of 14 species living in Kerguelen waters, southern Indian Ocean. Most of the species show distinct isotopic niches that differ by at least one of the two niche axes (d13C habitat and d15N trophic position), indicating trophic partitioning within the assemblage. Strong niche segregation occurs within each of the three most common genera of myctophids (Electrona, Gymnoscopelus, and Protomyctophum), illustrating the different mechanisms (habitat and dietary segregation) that allow coexistence of closely related species. Calculated trophic levels (TLs) of myctophids ranged from 3.3 to 4.2, showing that they are secondary and tertiary consumers in the pelagic ecosystem. The positive relationship between TL and standard length of fish points out a structuring effect of size, with larger species (Gymnoscopelus spp.) occupying a higher trophic position than smaller species (Krefftichthys anderssoni and Protomyctophum spp.). Myctophids occupy an intermediate trophic position between macrozooplanktonic crustaceans and seabirds and marine mammals within the pelagic ecosystem. However, the TLs of large myctophids overlap those of crustacean-eating seabirds [e.g., Eudyptes spp. (crested penguins) and Pachyptila belcheri]. The isotopic niche of myctophids indicates that Aptenodytes patagonicus (king penguin) adults prey upon K. anderssoni when they feed for themselves, thus exemplifying the usefulness of isotopic datasets on potential prey of predators to depict trophic relationships. Article in Journal/Newspaper Southern Ocean Université de Nantes: HAL-UNIV-NANTES Southern Ocean Kerguelen Indian Limnology and Oceanography 55 1 324 332 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Cherel, Yves Fontaine, Camille Richard, Pierre Labat, Jean-Philippe Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience We report the trophic structure of a myctophid assemblage by measuring the isotopic niches of 14 species living in Kerguelen waters, southern Indian Ocean. Most of the species show distinct isotopic niches that differ by at least one of the two niche axes (d13C habitat and d15N trophic position), indicating trophic partitioning within the assemblage. Strong niche segregation occurs within each of the three most common genera of myctophids (Electrona, Gymnoscopelus, and Protomyctophum), illustrating the different mechanisms (habitat and dietary segregation) that allow coexistence of closely related species. Calculated trophic levels (TLs) of myctophids ranged from 3.3 to 4.2, showing that they are secondary and tertiary consumers in the pelagic ecosystem. The positive relationship between TL and standard length of fish points out a structuring effect of size, with larger species (Gymnoscopelus spp.) occupying a higher trophic position than smaller species (Krefftichthys anderssoni and Protomyctophum spp.). Myctophids occupy an intermediate trophic position between macrozooplanktonic crustaceans and seabirds and marine mammals within the pelagic ecosystem. However, the TLs of large myctophids overlap those of crustacean-eating seabirds [e.g., Eudyptes spp. (crested penguins) and Pachyptila belcheri]. The isotopic niche of myctophids indicates that Aptenodytes patagonicus (king penguin) adults prey upon K. anderssoni when they feed for themselves, thus exemplifying the usefulness of isotopic datasets on potential prey of predators to depict trophic relationships. |
author2 |
Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Océanographie Biologique et Écologie du Plancton Marin (LOBEPM) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Cherel, Yves Fontaine, Camille Richard, Pierre Labat, Jean-Philippe |
author_facet |
Cherel, Yves Fontaine, Camille Richard, Pierre Labat, Jean-Philippe |
author_sort |
Cherel, Yves |
title |
Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean |
title_short |
Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean |
title_full |
Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean |
title_fullStr |
Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean |
title_full_unstemmed |
Isotopic niches and trophic levels of myctophid fishes and their predators in the Southern Ocean |
title_sort |
isotopic niches and trophic levels of myctophid fishes and their predators in the southern ocean |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00528576 https://doi.org/10.4319/lo.2010.55.1.0324 |
geographic |
Southern Ocean Kerguelen Indian |
geographic_facet |
Southern Ocean Kerguelen Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.science/hal-00528576 Limnology and Oceanography, 2010, 55 (1), pp.324-332. ⟨10.4319/lo.2010.55.1.0324⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.4319/lo.2010.55.1.0324 hal-00528576 https://hal.science/hal-00528576 doi:10.4319/lo.2010.55.1.0324 |
op_doi |
https://doi.org/10.4319/lo.2010.55.1.0324 |
container_title |
Limnology and Oceanography |
container_volume |
55 |
container_issue |
1 |
container_start_page |
324 |
op_container_end_page |
332 |
_version_ |
1766207189469364224 |