1. Dept of Animal Ecology; Netherlands Inst. of Ecology (NIOO-KNAW); Wageningen the Netherlands
2. Centre for Integrative Ecology; School of Life and Environmental Sciences, Deakin Univ.; Geelong Australia
3. Dept of Bird Migration; Swiss Ornithological Inst.; Sempach Switzerland
4. Dept of Bioscience; Aarhus Univ.; Denmark