FN Archimer Export Format PT J TI Emergence of negative trophic level-size relationships from a size-based, individual-based multispecies fish model BT AF Travers-Trolet, Morgane Coppin, Franck Cresson, Pierre Cugier, Philippe Oliveros-Ramos, Ricardo Verley, Philippe AS 1:1,2;2:1;3:1;4:3;5:2;6:4; FF 1:PDG-RBE-EMH;2:PDG-RBE-HMMN-LRHBL;3:PDG-RBE-HMMN-LRHBL;4:PDG-ODE-DYNECO-LEBCO;5:;6:; C1 Ifremer, Channel & North Sea Fisheries Research Unit, RH, 150 Quai Gambetta, 62200 Boulogne-sur-Mer, France Ifremer, Centre Atlantique, EMH, rue de l’île d’Yeu, 44300 Nantes, France Ifremer, Ctr Bretagne, DYNECO-LEBCO, CS10070, F-29280 Plouzané, France AMAP, IRD, CNRS, CIRAD, INRA, Univ Montpellier, Montpellier, France C2 IFREMER, FRANCE IFREMER, FRANCE IFREMER, FRANCE IRD, FRANCE SI NANTES BOULOGNE BREST SE PDG-RBE-EMH PDG-RBE-HMMN-LRHBL PDG-ODE-DYNECO-LEBCO IN WOS Ifremer UPR copubli-france copubli-p187 IF 2.497 TC 15 UR https://archimer.ifremer.fr/doc/00511/62290/66748.pdf LA English DT Article CR CAMANOC CGFS : CHANNEL GROUND FISH SURVEY BO Thalassa DE ;Emergent patterns;Pelagic-benthic coupling;Individual-based model;Food web;Fish community AB Modeling the mechanisms underlying trophic interactions between individuals allows the food web structure to emerge from local interactions, which constitutes a prerequisite for assessing how marine ecosystems respond to various anthropogenic pressures. Using a multispecies spatially explicit individual-based model, the emergence of trophic patterns was explored in the eastern English Channel ecosystem, where pelagic-benthic trophic coupling was recently studied empirically. The OSMOSE model was applied to this ecosystem by explicitly representing the life cycle of 13 fish species and one squid group, forced by pelagic and benthic prey fields that are variable over time and space. A matrix defining possible accessibilities between life stages was added to the model to link benthic and pelagic communities through overlap of vertical distribution. After optimizing some parameters of the model to represent the average state of the fish community during the 2000–2009 period, the simulated trophic structure was explored and compared to empirical data. The simulated and stable-isotope-derived trophic levels of fish were in relatively good agreement. Intraspecific variability of the trophic level is high in the five stable-isotope datasets but is well encompassed by the model. Despite the hypothesis of opportunistic size-based predation, the simulation showed a decreasing trend of trophic level with size for four benthic species, a pattern observed empirically for a different set of species in the ecosystem. Model exploration showed that this emerging pattern varies spatially and is both explained by the spatial variability of prey availability and by the independence of trophic and size structures of benthic invertebrates. The combination of individual-based models, stomach contents and intrinsic tracers, such as stable isotopes, appears to be a promising tool to better understand the causes of observed trophic patterns. PY 2019 PD OCT SO Ecological Modelling SN 0304-3800 PU Elsevier BV VL 410 UT 000487178500010 DI 10.1016/j.ecolmodel.2019.108800 ID 62290 ER EF