Artikel-Suche

Thoma, M. & S. Althaus

Inneralpines Auftreten ziehender Watvögel: Diversität, Häufigkeit und Phänologie durchziehender Limikolen auf dem Col de Bretolet.

2016

113

31–52

Key words
(von 1994 bis 2006 vergeben)

Durchzug, Beobachtung, Beringungsstation, Fängling, Tagzug, Nachtzug, Phänologie, Herbstzug, Witterung, Flug- und Rufverhalten, Auftretensmuster

Schlagwort_Vogelart
(wissenschaftlich)

Haematopus ostralegus, Charadrius dubius, Charadrius hiaticula, Charadrius morinellus, Pluvialis squatarola, Vanellus vanellus, Calidris alba, Calidris minuta, Calidris temminckii, Calidris alpina, Philomachus pugnax, Lymnocryptes minimus, Gallinago gallinago, Scolopax rusticola, Limosa limosa, Numenius phaeopus, Numenius arquata, Tringa erythropus, Tringa totanus, Tringa nebularia, Tringa ochropus, Tringa glareola, Actitis hypoleucos

Schlagwort_Vogelart
(deutsch)

Austernfischer, Flussregenpfeifer, Sandregenpfeifer, Mornellregenpfeifer, Kiebitzregenpfeifer, Kiebitz, Sanderling, Zwergstrandläufer, Temminckstrandläufer, Alpenstrandläufer, Kampfläufer, Zwergschnepfe, Bekassine, Waldschnepfe, Uferschnepfe, Regenbrachvogel, Grosser Brachvogel, Dunkler Wasserläufer, Rotschenkel, Grünschenkel, Waldwasserläufer, Bruchwasserläufer, Flussuferläufer

Alpen, Col de Bretolet, Col de Cou, Val d’Illiez, Vallée d’Aulps, Wallis, Schweiz, Hochsavoyen, Frankreich

deutsch

Abhandlung

Inner-alpine occurrence of migrating shore birds: diversity, frequency and phenology of waders on the Col de Bretolet. – Despite extensive research on bird migration in the Swiss Alps, knowledge about the active migration of certain species within this mountain range is still largely lacking. This applies especially to waders. Due to its location at an alpine pass at almost 2000 m a.s.l. the bird ringing station of the Swiss Ornithological Institute on the Col de Bretolet (canton of Valais, 46° 8’ 34” N/6° 47’ 45” E) offers the opportunity to monitor active post-breeding shorebird migration. In this paper we present a comprehensive overview based on all reported records from this site since the 1950s. Additionally we collected all wader observations during our time leading the ringing station in 2010–2014. These data form the largest collection of records of actively migrating waders within the Alps. Up to and including 2014 more than 2000 waders from 23 species have been recorded: Eurasian Oystercatcher, Little Ringed Plover, Common Ringed Plover, Eurasian Dotterel, Grey Plover, Northern Lapwing, Sanderling, Little Stint, Temminck’s Stint, Dunlin, Ruff, Jack Snipe, Common Snipe, Eurasian Woodcock, Black-tailed Godwit, Whimbrel, Eurasian Curlew, Spotted Redshank, Common Redshank, Common Greenshank, Green Sandpiper, Wood Sandpiper and Common Sandpiper. The vast majority of observations concerns birds in flight that were mostly heard at night. A comparison of the phenology of Green, Wood and Common Sandpiper on the Col de Bretolet shows a significant strong correlation with the phenology in Switzerland, where most shorebirds are observed in the lowlands. However, probably because of high flight altitudes, waders are only rarely captured and comprise only 0.02 % of 673634 birds ringed on the Col de Bretolet since 1954. In 2010–2014 waders were observed on 113 days, i.e. 23.2 % of the days during which the ringing station was operating. Our observations concern at least 558 individuals from 14 species. Almost half of the birds observed were Common Sandpipers. 70.4 % of all individuals crossed the Col de Bretolet during twilight or (especially) at night. Only on eight days were waders also recorded during daytime. The observed occurrence pattern, potential biases influencing this pattern (e.g. flight and calling behaviour) and indications for active daytime migration across the Alps are discussed.