1. Computational Geo-Ecology, Inst. for Biodiversity and Ecosystem Dynamics, Univ. of Amsterdam, Science Park 904; Amsterdam the Netherlands
2. Centre for Avian Migration and Demography, Dept of Animal Ecology, Netherlands Inst. of Ecology (NIOO-KNAW); Wageningen the Netherlands
3. Ecocurves; Haren the Netherlands
4. Sovon Dutch Centre for Field Ornithology, Coastal Ecology Team, Den Burg; Texel the Netherlands
5. Wageningen University and Research, Wageningen Marine Research; Den Helder the Netherlands