1. Magnus Lindh, Department of Physical GeographyStockholm University Stockholm Sweden
2. Evolution & Ecology Research Centre, and School of Biological, Earth and Environmental SciencesUniversity of New South Wales Sydney NSW Australia
3. School of Mathematical ScienceYangzhou University Yangzhou China
4. Evolution and Ecology ProgramInternational Institute for Applied Systems Analysis Laxenburg Austria
5. Department of Mathematics and Mathematical StatisticsUmeå University Umeå Sweden