Colour-ringing of Oystercatchers in the Wadden Sea of Schleswig-Holstein, Germany
Dominic Cimiotti Michael-Otto-Institut im NABU, Bergenhusen [email protected] Background
Since 2010: use of Dutch colour rings in the German Wadden Sea
Distribution of the STW ringsystem. Source: Wadertrack
R. Stecher
Who we are
Ilka Hoppe, Schutzstation Wattenmeer Angelika Kühn Hermann Hötker Dominic Cimiotti
Coordination:
Maria Schiffler working at Oland Martin Kühn, National park ranger Interested: Frank Hofeditz and Sabrina Langhans Klaus Günther Rainer Rehm Overview ringing sites
Hallig Oland Actual study sites Hallig Langeneß Planned study sites Hamburger Hallig
Pellworm
Numbers of c-ringed birds:
Meldorfer Bucht 63 ad + 3 juv. (2010-2012) Hedwigenkoog foreland Oland 47 juv. (2011-2012) Langeneß 9 juv. (2012) Meldorfer Bucht Hooge 9 juv. (2011) NABU study
Study site „Meldorfer Bucht“
Two sub-areas: • Helmsand (salt marsh) national park • Meldorfer Speicherkoog (polder) nature reserves, sheep farming
Scientific objectives: • survival rates • breeding success • migratory behaviour R. Stecher First results Meldorfer Bucht
Breeding success
• (nearly) no breeding success only 3 chicks ringed • high predation rates of nests • chicks mainly on roofs
First results Meldorfer Bucht
Survival rates
• high survial from 2010 to 2011 • low survival from 2011 to 2012 (strong late-winter)
Annual return rates
100
90 80
rate rate (%) 70 60 50 40 30 20
Observed Observed return 10 0 2011 (n = 30) 2012 (n = 56) Year First results Meldorfer Bucht
Migratory behaviour
• only one record outside Meldorfer Bucht (dead bird on Borkum)
• several observations within study site in winter stationary?
• use of light-level geolocators 2011 and 2012 (c. 30 birds)
A. Thorenmeier Outlook
• New study site Pellworm? (island with high numbers and breeding success) comparison good/poor breeding sites (Meldorf/Pellworm) ringing of chicks, juvenile survival
• Re-catch of birds with geolocators (Meldorfer Bucht)
• Up to 2 new study sites of other ringers (Hamburger Hallig, Hedwigenkoog)
Thank you for your attention!