RT Journal Article T1 Trophic Interactions Are Key to Understanding the Effects of Global Change on the Distribution and Functional Role of the Brown Bear A1 Lucas, Pablo M. A1 Selva Fernández, Nuria A1 Pollock, Laura J. AB Biotic interactions are expected to influence species' responses to global changes, but they are rarely considered across broadspatial extents. Abiotic factors are thought to operate at larger spatial scales, while biotic factors, such as species interactions,are considered more important at local scales within communities, in part because of the knowledge gap on species interactionsat large spatial scales (i.e., the Eltonian shortfall). We assessed, at a continental scale, (i) the importance of biotic interactions,through food webs, on species distributions, and (ii) how biotic interactions under scenarios of climate and land-usechange mayaffect the distribution of the brown bear (Ursus arctos). We built a highly detailed, spatially dynamic, and empirically sampledfood web based on the energy contribution of 276 brown bear food species from different taxa (plants, vertebrates, and invertebrates)and their ensemble habitat models at high resolution across Europe. Then, combining energy contribution and predictedhabitat of food species, we modelled energy contribution across space and included these layers within Bayesian-basedmodels ofthe brown bear distribution in Europe. The inclusion of biotic interactions considerably improved our understanding of brownbear distribution at large (continental) scales compared with Bayesian models including only abiotic factors (climate and landuse). Predicted future range shifts, which included changes in the distribution of food species, varied greatly when consideringvarious scenarios of change in biotic factors, providing a warning that future indirect climate and land-usechange are likely tohave strong but highly uncertain impacts on species biogeography. Our study confirmed that advancing our understanding ofecological networks of species interactions will improve future projections of biodiversity change, especially for modelling speciesdistributions and their functional role under climate and land-usechange scenarios, which is key for effective conservationof biodiversity and ecosystem services PB Wiley SN 1354-1013 SN 1365-2486 (electrónico) YR 2025 FD 2025-04 LK https://hdl.handle.net/10272/25685 UL https://hdl.handle.net/10272/25685 LA eng NO Lucas, P. M., Thuiller, W., Talluto, L., Polaina, E., Albrecht, J., Selva, N., De Barba, M., Penteriani, V., Guéguen, M., Balkenhol, N., Dutta, T., Fedorca, A., Frank, S. C., Zedrosser, A., Afonso‐Jordana, I., Ambarlı, H., Ballesteros, F., Bashta, A., Bilgin, C. C., … Pollock, L. J. (2025). Trophic Interactions Are Key to Understanding the Effects of Global Change on the Distribution and Functional Role of the Brown Bear. Global Change Biology, 31(6). https://doi.org/10.1111/gcb.70252 NO This work was supported by 2015-2016BiodivERsA COFUND call (147), Narodowe Centrum Nauki (2016/22/Z/NZ8/00121), Ministerio de cienciainnovación y universidades/Agencia estatal de investigación (CNS2022-136018and PID2020-114181GB-I00),European Union NextGenerationEU/PRTR(CNS2022-136018),Junta de Andalucía (EMERGIA20_00135), Agence Nationale de la Recherche (ANR16-EBI3-0003),Bundesministerium für Bildung undForschung (01LC1614A), Colegiul Consultativ pentru Cercetare-Dezvoltareşi Inovare (BiodivERsA3-2015-147-BearConnect96/2016), Norwegian ResearchCouncil (RCN) (269863), Balkan Lynx Recovery Programme, National Geographic Society, University of Utah, Columbus Zoo and Aquarium (USA), EstonianMinistry of Education and Research (PRG1209), Dutch Ministry of Agriculture, Nature and Food Quality, Austrian Science Fund, WWF Adria, MAVAFoundation, Gobierno del Principado de Asturias, UNDP Small Grants Programme, The Nature Conservation Centre, Vodafone, Kastamonu Üniversitesi,United Nations GEF-5Programme, ARCTUROS, Civil Society for the Protection and Management of Wildlife and the Natural Environment, Naturvårdsverket,The Scandinavian Brown Bear Research Project, The European Regional Development Fund (ERDF) (PID2020-114181GB-I00),Regione Autonoma FriuliVenezia Giulia, Segre Fund, International Association for Bear Research and Management (USA), Bernd Thies Foundation, Aktionsgemeinschaft Artenschutz,WWF Austria, Türkiye General Directorate of Nature Conservation and National Parks, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, ZoologischeGesellschaft Frankfurt, Stichting Wildlife (the Netherlands), BBI-MATRA,PIN-MATRA,Ministerio para la Transición Ecológica y el Reto Demográfico (LIFE19NAT/ES/000913), Russian Science Foundation (18-14-00093),Bears in Mind, Stiftung für Bären (Germany), LIFE programme (LIFE96 NAT/GR/003222,LIFE07 NAT/IT/000502, LIFE09 NAT/GR/000333, LIFE12 NAT/GR/000784, LIFE15 NAT/GR/001108, LIFE08 NAT/RO/000500, LIFE13 NAT/SI/000550,LIFE07 NAT/IT/000502, LIFE19 NAT/ES/000913, LIFE13 NAT/RO/001154, LIFE99 NAT/GR/006498, LIFE07 NAT/GR/000291), Hellenic Ministry of RuralDevelopment and Food, Nando Peretti Foundation (Italy), Romanian Environmental SOP (ROSCI0229 Siriu), Sigrid Rausing Trust, Ministry of Forestry andWater Affairs from Türkiye, Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja (451-03-68/2022-14-200007),Hacettepe Üniversitesi, European Commission,Polish-NorwegianResearch Programme (POLNOR/198352/85/2013), EuroNatur Stiftung, Norwegian Directorate for Nature Management, Whitley Fund,Christensen Fund, The Slovenian Research and Innovation Agency (J4-7362),Kaçkar Mountains Sustainable Forest Use and Conservation Project, ERDFA way of making Europe (PID2020-114181GB-I00),Fresno Chaffe Zoo (United States), Ministry of Agriculture and Forestry, Government of Finland,Miljødirektoratet". DLR Project Management Agency (DLR-PT): 01LC1614A DS Repositorio Institucional de la Universidad de Huelva RD 31 may 2026