1. Univ. of Liverpool, Brownlow Hill Liverpool UK
2. Joint Nature Conservation Committee, Inverdee House Aberdeen UK
3. Dept of Bioscience, Aarhus Univ. Denmark
4. Independent Researcher Reykjavik Iceland
5. Independent Researcher Scotland UK
6. Finnish Museum of Natural History, Univ. of Helsinki Finland
7. Avescapes Oy Helsinki Finland
8. Centre for Ecology and Hydrology, Bush Estate Penicuik Midlothian UK