Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study
Although stable isotope ratios are increasingly used to investigate the trophic ecology of marine organisms, their spatial variations are still poorly understood in the coastal environment. In this study, we measured the stable isotope composition (delta C-13, delta N-15) of suspended particulate or...
Published in: | Estuarine, Coastal and Shelf Science |
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Online Access: | https://oskar-bordeaux.fr/handle/20.500.12278/199250 https://hdl.handle.net/20.500.12278/199250 https://doi.org/10.1016/j.ecss.2015.10.023 |
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/199250 2024-05-19T07:39:19+00:00 Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study SCHAAL, Gauthier NÉROT, Caroline GRALL, Jacques CHOUVELON, Tiphaine LORRAIN, Anne MORTILLARO, Jean-Michel SAVOYE, Nicolas BRIND'AMOUR, Anik PAULET, Yves-Marie LE BRIS, Hervé 2016-09-20 https://oskar-bordeaux.fr/handle/20.500.12278/199250 https://hdl.handle.net/20.500.12278/199250 https://doi.org/10.1016/j.ecss.2015.10.023 en eng Elsevier 0272-7714 https://oskar-bordeaux.fr/handle/20.500.12278/199250 doi:10.1016/j.ecss.2015.10.023 Pas de Licence CC nitrogen isotopes food webs northeast atlantic Bay of Biscay Bivalves coastal continental-shelf crassostrea-gigas delta-n-15 Diet ACL Fish Food web spatial-analysis Trophic trophic relationships Sciences de l'environnement/Biodiversité et Ecologie Article de revue 2016 ftoskarbordeaux https://doi.org/20.500.12278/19925010.1016/j.ecss.2015.10.023 2024-04-22T01:36:30Z Although stable isotope ratios are increasingly used to investigate the trophic ecology of marine organisms, their spatial variations are still poorly understood in the coastal environment. In this study, we measured the stable isotope composition (delta C-13, delta N-15) of suspended particulate organic matter (SPOM) (primary producer), a suspension feeder, the great scallop Pecten maximus (primary consumer), megabenthic decapods and benthic fishes (secondary consumers) along a depth gradient (from 5 m to 155 m depth) across the continental shelf of the Bay of Biscay. Although the three trophic levels exhibited similar delta C-13 patterns along the gradient, the delta N-15 patterns varied between SPOM, scallops and carnivores. The delta N-15 difference between SPOM and scallops decreased with increasing depth, suggesting that non trophic factors may affect the stable isotope composition of scallops at deepest sampling stations. An opposed trend was found between scallops and carnivores, suggesting that the trophic level of these carnivores increased at higher depth, possibly as an adaptation to lower prey abundances. Although our results suggest that primary consumers are suitable to establish isotopic baselines in coastal environments, we stress the need for further studies aiming at characterizing the variability of stable isotopes in coastal biota, and the respective effects of baseline, trophic and metabolic factors in their isotopic composition. Article in Journal/Newspaper Crassostrea gigas Northeast Atlantic OSKAR Bordeaux (Open Science Knowledge ARchive) Estuarine, Coastal and Shelf Science 179 201 206 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
nitrogen isotopes food webs northeast atlantic Bay of Biscay Bivalves coastal continental-shelf crassostrea-gigas delta-n-15 Diet ACL Fish Food web spatial-analysis Trophic trophic relationships Sciences de l'environnement/Biodiversité et Ecologie |
spellingShingle |
nitrogen isotopes food webs northeast atlantic Bay of Biscay Bivalves coastal continental-shelf crassostrea-gigas delta-n-15 Diet ACL Fish Food web spatial-analysis Trophic trophic relationships Sciences de l'environnement/Biodiversité et Ecologie SCHAAL, Gauthier NÉROT, Caroline GRALL, Jacques CHOUVELON, Tiphaine LORRAIN, Anne MORTILLARO, Jean-Michel SAVOYE, Nicolas BRIND'AMOUR, Anik PAULET, Yves-Marie LE BRIS, Hervé Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study |
topic_facet |
nitrogen isotopes food webs northeast atlantic Bay of Biscay Bivalves coastal continental-shelf crassostrea-gigas delta-n-15 Diet ACL Fish Food web spatial-analysis Trophic trophic relationships Sciences de l'environnement/Biodiversité et Ecologie |
description |
Although stable isotope ratios are increasingly used to investigate the trophic ecology of marine organisms, their spatial variations are still poorly understood in the coastal environment. In this study, we measured the stable isotope composition (delta C-13, delta N-15) of suspended particulate organic matter (SPOM) (primary producer), a suspension feeder, the great scallop Pecten maximus (primary consumer), megabenthic decapods and benthic fishes (secondary consumers) along a depth gradient (from 5 m to 155 m depth) across the continental shelf of the Bay of Biscay. Although the three trophic levels exhibited similar delta C-13 patterns along the gradient, the delta N-15 patterns varied between SPOM, scallops and carnivores. The delta N-15 difference between SPOM and scallops decreased with increasing depth, suggesting that non trophic factors may affect the stable isotope composition of scallops at deepest sampling stations. An opposed trend was found between scallops and carnivores, suggesting that the trophic level of these carnivores increased at higher depth, possibly as an adaptation to lower prey abundances. Although our results suggest that primary consumers are suitable to establish isotopic baselines in coastal environments, we stress the need for further studies aiming at characterizing the variability of stable isotopes in coastal biota, and the respective effects of baseline, trophic and metabolic factors in their isotopic composition. |
format |
Article in Journal/Newspaper |
author |
SCHAAL, Gauthier NÉROT, Caroline GRALL, Jacques CHOUVELON, Tiphaine LORRAIN, Anne MORTILLARO, Jean-Michel SAVOYE, Nicolas BRIND'AMOUR, Anik PAULET, Yves-Marie LE BRIS, Hervé |
author_facet |
SCHAAL, Gauthier NÉROT, Caroline GRALL, Jacques CHOUVELON, Tiphaine LORRAIN, Anne MORTILLARO, Jean-Michel SAVOYE, Nicolas BRIND'AMOUR, Anik PAULET, Yves-Marie LE BRIS, Hervé |
author_sort |
SCHAAL, Gauthier |
title |
Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study |
title_short |
Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study |
title_full |
Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study |
title_fullStr |
Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study |
title_full_unstemmed |
Stable isotope ratios in bentho-demersal biota along a depth gradient in the Bay of Biscay: A multitrophic study |
title_sort |
stable isotope ratios in bentho-demersal biota along a depth gradient in the bay of biscay: a multitrophic study |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/199250 https://hdl.handle.net/20.500.12278/199250 https://doi.org/10.1016/j.ecss.2015.10.023 |
genre |
Crassostrea gigas Northeast Atlantic |
genre_facet |
Crassostrea gigas Northeast Atlantic |
op_relation |
0272-7714 https://oskar-bordeaux.fr/handle/20.500.12278/199250 doi:10.1016/j.ecss.2015.10.023 |
op_rights |
Pas de Licence CC |
op_doi |
https://doi.org/20.500.12278/19925010.1016/j.ecss.2015.10.023 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
179 |
container_start_page |
201 |
op_container_end_page |
206 |
_version_ |
1799478885909266432 |