“…Low GRN are adaptive for feeding on benthic invertebrates and high GRN for feeding on zooplankton prey, as indicated by trait utility tests with sympatric Alpine whitefish species (Lundsgaard‐Hansen, Matthews, Vonlanthen, Taverna, & Seehausen, ; Roesch, Lundsgaard‐Hansen, Vonlanthen, Taverna, & Seehausen, ; B. Lundsgaard‐Hansen, C. Rösch, and O. Seehausen, unpublished data) and phenotype–environment correlations (Harrod et al., ; Kahilainen et al., ). Divergence along water depth occurs both outside the spawning season during feeding (Harrod et al., ; Steinmann, ), and very strongly during the spawning season on spawning grounds (Hudson et al., ; Vonlanthen et al., ). Furthermore, temporal (Steinmann, ) and spatial spawning segregation across lake habitats (Scandinavia, Østbye, Næsje, Bernatchez, Sandlund, & Hindar, ) can contribute to RI in whitefish.…”