1. Institut National de la Recherche Scientifique; Centre Eau, Terre et Environnement; Québec QC G1K 9A9 Canada
2. GEOTOP Research Center; Montréal QC H3C 3P8 Canada
3. Institute of Geography; University of Leipzig; D-04103 Leipzig Germany
4. Institute of Geography; Dresden University of Technology; D-01069 Dresden Germany
5. Potsdam Institute for Climate Impact Research; D-14473 Potsdam Germany
6. Département de Géographie; Centre d'étude nordique; Québec QC G1V 0A6 Canada
7. Limnology Unit; Department of Biology; Ghent University; B-9000 Gent Belgium
8. Institute of Prehistoric Archaeology; University of Cologne; D-50823 Köln Germany