1. Univ. of Amsterdam, Inst. for Biodiversity and Ecosystem Dynamics (IBED) Amsterdam the Netherlands
2. Netherlands eScience Center Amsterdam the Netherlands
3. Sovon Dutch Centre for Field Ornithology Nijmegen the Netherlands
4. Dept of Animal Ecology and Ecophysiology, Inst. for Water and Wetland Research, Radboud Univ. Nijmegen the Netherlands