Thoma, M. & S. Althaus
(* = Kurzbeitrag)
Ziehende Sanderlinge Calidris alba auf dem Col de Bretolet (Kanton Wallis).
(von 1994 bis 2006 vergeben)
Seltenheitsbeobachtung, Beringung, Mauser, Altersbestimmung
Col de Bretolet, Wallis, Schweiz
Migrating Sanderlings Calidris alba at Col de Bretolet (Valais). On the afternoon of 14 September 2011 two juvenile Sanderlings Calidris alba were caught and ringed at the bird ringing station of the Swiss Ornithological Institute on Col de Bretolet, southwestern Switzerland, 1920 m a.s.l. They were part of a flock of 40 individuals flying from east to west across the pass. This is the largest flock reported for the country. Sanderlings are rarely recorded in the Alps, and this is the first record of this species for the station and one of the highest for Switzerland. Both birds showed a mixture of moulted and unmoulted body feathers but growing feathers could not be detected. This is possibly indicative of a suspended moult during migration. One Sanderling was recaptured on the east coast of England near Snettisham, Norfolk, in 2012. Observations at stopover sites within the Alps show that waders regularly enter the alpine arc during migration. However, records of migrating waders within the Alps are mainly restricted to nocturnal observations, such as by radar, calling birds, or irregular captures at ringing stations. The Sanderling record from Col de Bretolet is a possible indication that migrating waders also cross the Alps during daytime. We present detailed information on the Sanderlings captured and discuss potential causes that led to the occurrence of the birds on Col de Bretolet.
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