The Origins of Knots Calidris canutus in Arctic Norway in Spring

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Abstract
Knots occurring in north Norway in spring have been presumed to breed in Siberia [USSR]. We find that, based on their body size, ringing locations and migration timing, Knots in Balsfjord, north Norway, in May belong to the Nearctic breeding population C. c. islandica. Some moult in autumn on the Wash and Wadden Sea, and overwinter in Britain, notably at Teesmouth and the Wash. Some may reach Balsfjord in Mat after a direct flight from the Wash. 15,000-28,000 Knots are present for 2-3 wk in May, departing between 25-30 May, making Balsfjord a staging site of major international importance to Knots. The breeding origins of at least 30,000 Knots present in Porsangerfjord (250 km NE) are unknown, but migration timing and ringing location indicates possible Nearctic origin for these also.

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