Fig 1. Map showing the three study sites in the Arctic area: the high arctic Zackenberg valley (NE Greenland; 74°30’N / 21°00’W), the low arctic Disko Island (W Greenland; 69°14’N / 53°32’W) and the subarctic Sodankylä (N Finland 67°22’N / 26°38’E).
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