Journal of Limnology and Freshwater Fisheries Research2149-4428Eğirdir Su Ürünleri Araştırma Enstitü MüdürlüğüInteractive Effects of Lake Morphometry and Sticklebacks on the Trophic Position of Arctic charr, Salvelinus alpinus (L.), across Lakes in Western GreenlandArranzIgnasiPaul Sabatierhttps://orcid.org/0000-0002-1517-1713DavidsonThomas AlexanderDepartment of Bioscience, Aarhus University, Silkeborg, Denmarkhttps://orcid.org/0000-0003-2326-1564BenejamLluísUniversity of Vichttps://orcid.org/0000-0002-2741-4858BrucetSandraUniversity of Vichttps://orcid.org/0000-0002-0494-1161Sánchez-hernándezJavierDepartamento de Biología, Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles, Madrid, Spainhttps://orcid.org/0000-0001-9684-4774LandkildehusFrankDepartment of Bioscience, Aarhus University, Silkeborg, Denmarkhttps://orcid.org/0000-0001-8058-295XLauridsenTorbenDepartment of Bioscience, Aarhus University, Silkeborg, Denmarkhttps://orcid.org/0000-0003-0139-2395MazzeoNestorDepartamento de Ecología y Gestión Ambiental, Centro Universitario Regional del Este (CURE), Universidad de la Repúblicahttps://orcid.org/0000-0002-3090-2617VidalNicolasDepartamento de Ecología y Evolución, Facultad de Ciencias Universidad de la República, Montevideo, Uruguayhttps://orcid.org/0000-0002-9200-5225ÖzkanKorhanInstitute of Marine Sciences, Middle East Technical University, Mersin, Turkeyhttps://orcid.org/0000-0003-1911-6508GallegoIreneDepartment of Aquatic Ecology, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerlandhttps://orcid.org/0000-0002-3309-6788WischnewskiJulianeDepartment of Bioscience, Aarhus University, Silkeborg, Denmarkhttps://orcid.org/0000-0003-0828-3781MenezesRosembergUniversidade Federal da Paraíba, Centro de Ciências Agrárias, Departamento de Fitotecnia e Ciências Ambientais, Areia, Paraíba, Brazilhttps://orcid.org/0000-0001-9949-8221ShurkhuuTserenpilNuclear Research Center, National University of Mongolia, Ulaanbaatar, Mongoliahttps://orcid.org/0000-0001-8139-4897JeppesenErikDepartment of Bioscience, Aarhus University, Silkeborg, Denmarkhttps://orcid.org/0000-0002-0542-369X10.17216/limnofish.102072208262022821011151123202101042022The structure and functioning of Arctic ecosystems have been drastically modified by global warming, with fish species potentially performing habitat shifts such as the northern expansion of generalist and warm-adapted species. The freshwater fish species Arctic charr (Salvelinus alpinus, hereafter charr) plays a key role in Arctic lake food webs, but sticklebacks (Gasterosteus aculeatus) may impact the trophic position (TP) of charr by affecting their habitat choice and food resources. In the present study, we used multiple regression analyses to examine the role of lake morphology (i.e., depth and area) and the influence of sticklebacks on the TP of charr (estimated from δ15N and δ13C) sampled in nine Arctic lakes in Western Greenland between 2011 and 2013. Results showed that charr populations exhibited larger TP values when co-occurring with sticklebacks. Specifically, for larger and deeper lakes, a significant positive effect on TP values was observed for medium-sized (25 to 35 cm) charr. Moreover, the TP of sticklebacks had a null effect on the TP values of the largest charr (> 40 cm), suggesting that the largest-sized charr individuals did not prey on sticklebacks. 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