Fig. 2. Breeding range in Greenland of three boreo-panarctic seabirds, Sterna paradisaea, Cepphus grylle, and Stercorarius parasiticus, and one low arctic species, Phalaropus lobatus.
Fig. 3. Breeding range in Greenland of three panarctic seabirds, Uria lomvia, Larus hyperboreus, and Clangula hyemalis, and one high arctic species, Stercorarius longicaudus.
Fig. 4. Breeding range in Greenland of three boreo-low arctic seabirds, Mergus serrator, Larus marinus, and Phalacrocorax carbo, and one high arctic species, Plautus alle.
The widely differing ranges of Greenland seabirds are shown in Figs. 1-4 and are based on my new and previously unpublished data. The borderline between the high arctic and low arctic zones is situated in Melville Bay on the west coast, and just south of Scoresby Sound on the east coast; the innermost parts of Scoresby Sound belong to the low arctic zone.