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. 2020 Sep 25;10(20):11335–11351. doi: 10.1002/ece3.6771

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© 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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(a) Study area of Lake Tinnsjøen, Norway. Exact sampling positions are not reported until more information is available about the population status of the new Abyssal morph. 1:125,000 using ArcGIS (ESRI 2015). (b) Sexually mature fish from each of the four Arctic charr morphs in Lake Tinnsjøen. From top to bottom: Piscivore (greyish colour and inflated swim bladder; Body length: 217.38 ± 92.96, mean ± SD), Planktivore (male in spawning dress with orange belly; 177.27 ± 63.35), Dwarf (brown with inflated swim bladder; 113.82 ± 21.50), and Abyssal (sunken eyes; 78.58 ± 10.66). (Photo © K. Østbye)