FN Archimer Export Format PT J TI Trophic ecology of large gadiforms in the food web of a continental shelf ecosystem BT AF Day, Louise Kopp, Dorothee Robert, Marianne Le Bris, Hervé AS 1:1,2;2:2;3:2;4:1; FF 1:PDG-RBE-EMH;2:PDG-RBE-STH-LTBH;3:PDG-RBE-STH-LTBH;4:; C1 ESE, Ecology and Ecosystem Health, AGROCAMPUS OUEST, INRA, 65 rue de Saint Brieuc, 35042, Rennes, France IFREMER, Unité de Sciences et Technologies halieutiques, Laboratoire de Technologie et Biologie Halieutique, 8 rue François Toullec, F-56100, Lorient, France C2 AGROCAMPUS OUEST, FRANCE IFREMER, FRANCE SI NANTES LORIENT SE PDG-RBE-EMH PDG-RBE-STH-LTBH IN WOS Ifremer UPR copubli-france IF 4.06 TC 9 UR https://archimer.ifremer.fr/doc/00486/59742/62839.pdf LA English DT Article CR EVHOE EVALUATION HALIEUTIQUE OUEST DE L'EUROPE DE ;Celtic Sea;Feeding;Gut content;Stable isotopes;Ontogeny;Habitat comparison AB Human activities affect continental shelves, especially due to the harvest of living marine resources. Understanding their functioning and dynamics has become a growing concern in recent decades, especially through use of trophic modelling approaches. Studying the feeding ecology of key component species also improves this understanding by providing accurate information on trophic processes, particularly the dependence on trophic pathways. This study focuses on the trophic ecology of four large gadiforms (cod, haddock, whiting and hake) found on the continental shelf of the Celtic Sea. The study combines information on recently ingested prey (gut content analysis) and a more integrated indicator of food sources (stable isotope analysis). Two size classes of each species were considered (small and large - split around 20 cm for haddock, whiting and hake and 60 cm for cod), as were shallow and deep zones. The four gadiforms show distinct feeding niches and strategies, which limit interspecific competition. Cod and haddock relied mainly on the benthic trophic pathway but differed in favouring piscivory and invertivory, respectively. Hake fed mainly on the pelagic trophic pathway, while whiting seemed to feed on both pathways. Ontogenetic shifts from invertivory to piscivory were observed for whiting in both zones and for hake and cod in the deep zone. An unexpected shift from the pelagic to the benthic trophic pathway was observed from small to large haddock in the deep zone. Taking into account the descriptions of diets made in adjacent ecosystems throughout the year, the four species show trophic plasticity towards one of the trophic pathways or the other. Differences between the shallow and deep zones were related to benthic and pelagic prey characteristics, which themselves are driven by the sedimentary and hydrological context, especially thermal stratification. PY 2019 PD JUN SO Progress In Oceanography SN 0079-6611 PU Elsevier BV VL 175 UT 000472990800009 BP 105 EP 114 DI 10.1016/j.pocean.2019.03.007 ID 59742 ER EF