FN Archimer Export Format PT J TI Stable isotope ratios in bentho-demersal biota along a depth gradient in the bay of biscay: A multitrophic study BT AF SCHAAL, Gauthier NEROT, Caroline GRALL, Jacques CHOUVELON, Tiphaine LORRAIN, Anne MORTILLARO, Jean-Michel SAVOYE, Nicolas BRIND'AMOUR, Anik PAULET, Yves-Marie LE BRIS, Herve AS 1:1;2:1;3:2;4:1,3,5;5:1;6:2,6;7:4;8:5;9:1;10:6; FF 1:;2:;3:;4:PDG-RBE-BE-LBCM;5:;6:;7:;8:PDG-RBE-EMH;9:;10:; C1 Inst Univ Europeen Mer, Lab Sci Environm Marin, IFREMER, IRD,CNRS,UMR UBO 6539, Rue Dumont dUrville, F-29280 Plouzane, France. Inst Univ Europeen Mer, Observ Domaine Cotier, UMS 3113, Rue Dumont dUrville, F-29280 Plouzane, France. Univ Rochelle, LIENSs, UMR 6250, Bat Marie Curie,Rue Paul Emile Victor, F-17000 La Rochelle, France. Univ Bordeaux 1, Lab EPOC, CNRS, Stn Marine Arcachon,UMR 5805, 2 Rue Prof Jolyet, F-33120 Arcachon, France. IFREMER, Unite Ecol & Modeles Halieut, BP21105,Rue Ile dYeu, F-44311 Nantes 03, France. Agrocampus Ouest, UMR Ecol & Sante Ecosyst 985, CS 84215,65 Rue St Brieuc, F-35042 Rennes, France. C2 UBO, FRANCE UBO, FRANCE UNIV LA ROCHELLE, FRANCE UNIV BORDEAUX, FRANCE IFREMER, FRANCE AGROCAMPUS OUEST, FRANCE SI NANTES SE PDG-RBE-BE-LBCM PDG-RBE-EMH UM LEMAR IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france IF 2.176 TC 6 UR https://archimer.ifremer.fr/doc/00288/39921/38481.pdf LA English DT Article DE ;Trophic;Coastal;Bivalves;Food web;Bay of Biscay AB 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 (δ13C, δ15N) 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 5m to 155m depth) across the continental shelf of the Bay of Biscay. Although the three trophic levels exhibited similar δ13C patterns along the gradient, the δ15N patterns varied between SPOM, scallops and carnivores. The δ15N 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. PY 2016 PD SEP SO Estuarine Coastal And Shelf Science SN 0272-7714 PU Academic Press Ltd- Elsevier Science Ltd VL 179 UT 000381531600019 BP 201 EP 206 DI 10.1016/j.ecss.2015.10.023 ID 39921 ER EF