Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids
International audience Cephalopods play a key role in the marine environment but knowledge of their feeding habits is limited by lack of data. Here, we have developed a new tool to investigate their feeding ecology by combining the use of their predators as biological samplers together with measurem...
Published in: | Proceedings of the Royal Society B: Biological Sciences |
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Online Access: | https://doi.org/10.1098/rspb.2005.3115 https://hal.archives-ouvertes.fr/hal-00187649 |
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fttriple:oai:gotriple.eu:10670/1.a9oe0b 2023-05-15T13:51:52+02:00 Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids Cherel, Yves Hobson, Keith A. Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Prairie and Northern Wildlife Research Centre Environment and Climate Change Canada 2005-07-01 https://doi.org/10.1098/rspb.2005.3115 https://hal.archives-ouvertes.fr/hal-00187649 en eng HAL CCSD hal-00187649 doi:10.1098/rspb.2005.3115 10670/1.a9oe0b https://hal.archives-ouvertes.fr/hal-00187649 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société Proceeding of The Royal Society Proceeding of The Royal Society, 2005, 272, pp.1601-1607. ⟨10.1098/rspb.2005.3115⟩ Antarctica community octopus ontogenic changes Southern Ocean predators envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2005 fttriple https://doi.org/10.1098/rspb.2005.3115 2023-01-22T17:44:33Z International audience Cephalopods play a key role in the marine environment but knowledge of their feeding habits is limited by lack of data. Here, we have developed a new tool to investigate their feeding ecology by combining the use of their predators as biological samplers together with measurements of the stable isotopic signature of their beaks. Cephalopod beaks are chitinous hard structures that resist digestion and the stable isotope ratios of carbon (d13C) and nitrogen (d15N) are indicators of the foraging areas and trophic levels of consumers, respectively. First, a comparison of d13C and d15N values of different tissues from the same individuals showed that beaks were slightly enriched in 13C but highly impoverished in 15N compared with lipid-free muscle tissues. Second, beaks from the same species showed a progressive increase in their d15N values with increasing size, which is in agreement with a dietary shift from lower to higher trophic levels during cephalopod growth. In the same way, there was an increase in the d15N signature of various parts of the same lower beaks in the order rostrum, lateral walls and wings, which reflects the progressive growth and chitinization of the beaks in parallel with dietary changes. Third, we investigated the trophic structure of a cephalopod community for the first time. Values of d15N indicate that cephalopods living in slope waters of the subantarctic Kerguelen Islands (nZ18 species) encompass almost three distinct trophic levels, with a continuum of two levels between crustacean- and fish-eaters and a distinct higher trophic level occupied by the colossal squid Mesonychoteuthis hamiltoni. d13C values demonstrated that cephalopods grow in three different marine ecosystems, with 16 species living and developing in Kerguelen waters and two species migrating from either Antarctica (Slosarczykovia circumantarctica) or the subtropics (the giant squid Architeuthis dux). The stable isotopic signature of beaks accumulated in predators' stomachs therefore revealed new ... Article in Journal/Newspaper Antarc* Antarctica Colossal Squid Kerguelen Islands Mesonychoteuthis hamiltoni Southern Ocean Unknown Kerguelen Kerguelen Islands Southern Ocean Proceedings of the Royal Society B: Biological Sciences 272 1572 1601 1607 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Antarctica community octopus ontogenic changes Southern Ocean predators envir geo |
spellingShingle |
Antarctica community octopus ontogenic changes Southern Ocean predators envir geo Cherel, Yves Hobson, Keith A. Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids |
topic_facet |
Antarctica community octopus ontogenic changes Southern Ocean predators envir geo |
description |
International audience Cephalopods play a key role in the marine environment but knowledge of their feeding habits is limited by lack of data. Here, we have developed a new tool to investigate their feeding ecology by combining the use of their predators as biological samplers together with measurements of the stable isotopic signature of their beaks. Cephalopod beaks are chitinous hard structures that resist digestion and the stable isotope ratios of carbon (d13C) and nitrogen (d15N) are indicators of the foraging areas and trophic levels of consumers, respectively. First, a comparison of d13C and d15N values of different tissues from the same individuals showed that beaks were slightly enriched in 13C but highly impoverished in 15N compared with lipid-free muscle tissues. Second, beaks from the same species showed a progressive increase in their d15N values with increasing size, which is in agreement with a dietary shift from lower to higher trophic levels during cephalopod growth. In the same way, there was an increase in the d15N signature of various parts of the same lower beaks in the order rostrum, lateral walls and wings, which reflects the progressive growth and chitinization of the beaks in parallel with dietary changes. Third, we investigated the trophic structure of a cephalopod community for the first time. Values of d15N indicate that cephalopods living in slope waters of the subantarctic Kerguelen Islands (nZ18 species) encompass almost three distinct trophic levels, with a continuum of two levels between crustacean- and fish-eaters and a distinct higher trophic level occupied by the colossal squid Mesonychoteuthis hamiltoni. d13C values demonstrated that cephalopods grow in three different marine ecosystems, with 16 species living and developing in Kerguelen waters and two species migrating from either Antarctica (Slosarczykovia circumantarctica) or the subtropics (the giant squid Architeuthis dux). The stable isotopic signature of beaks accumulated in predators' stomachs therefore revealed new ... |
author2 |
Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Prairie and Northern Wildlife Research Centre Environment and Climate Change Canada |
format |
Article in Journal/Newspaper |
author |
Cherel, Yves Hobson, Keith A. |
author_facet |
Cherel, Yves Hobson, Keith A. |
author_sort |
Cherel, Yves |
title |
Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids |
title_short |
Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids |
title_full |
Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids |
title_fullStr |
Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids |
title_full_unstemmed |
Stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids |
title_sort |
stable isotopes, beaks and predators: a new tool to study the trophic ecology of cephalopods, including giant and colossal squids |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://doi.org/10.1098/rspb.2005.3115 https://hal.archives-ouvertes.fr/hal-00187649 |
geographic |
Kerguelen Kerguelen Islands Southern Ocean |
geographic_facet |
Kerguelen Kerguelen Islands Southern Ocean |
genre |
Antarc* Antarctica Colossal Squid Kerguelen Islands Mesonychoteuthis hamiltoni Southern Ocean |
genre_facet |
Antarc* Antarctica Colossal Squid Kerguelen Islands Mesonychoteuthis hamiltoni Southern Ocean |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société Proceeding of The Royal Society Proceeding of The Royal Society, 2005, 272, pp.1601-1607. ⟨10.1098/rspb.2005.3115⟩ |
op_relation |
hal-00187649 doi:10.1098/rspb.2005.3115 10670/1.a9oe0b https://hal.archives-ouvertes.fr/hal-00187649 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1098/rspb.2005.3115 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
container_volume |
272 |
container_issue |
1572 |
container_start_page |
1601 |
op_container_end_page |
1607 |
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1766255908510236672 |