Warwick F. Vincent,^* Terry V. Callaghan,^** Dorthe Dahl-Jensen,^*** Margareta Johansson,^**** Kit M. Kovacs,^***** Christine Michel,^****** Terry Prowse,^******* James D. Reist,^******** Martin Sharp<sup>*********


*</sup>Warwick F. Vincent () is a Professor of biology and Canada Research Chair at Laval University, Canada, where he is also director of the Centre for Northern Studies (CEN), and member of the Takuvik Joint International Laboratory, Université Laval (Canada)—CNRS (France). He works on the effects of environmental change on polar aquatic ecosystems. Address: Département de Biologie & Centre d'Études Nordiques (CEN), Laval University, Québec City, QC G1V 0A6, Canada. e-mail: warwick.vincent@bio.ulaval.ca
^**Terry V. Callaghan is a Distinguished Research Professor at the Royal Swedish Academy of Sciences and Professor of Arctic Ecology at Universities of Sheffield, UK and Lund, Sweden. He specializes in Arctic ecology, and climate and UV-B radiation impacts on Arctic ecosystems. Address: Royal Swedish Academy of Sciences, 104 05 Stockholm, Sweden. e-mail: terry_callaghan@btinternet.com
^***Dorthe Dahl-Jensen is a professor at the University of Copenhagen, working on ice core records of climate, and the history and evolution of the Greenland Ice Sheet. Address: Niels Bohr Institutet, University of Copenhagen, 2100 Copenhagen, Denmark. e-mail: ddj@gfy.ku.dk
^****Margareta Johansson is a researcher at the Department of Earth and Ecosystem Sciences, Lund University and at the Royal Swedish Academy of Sciences, Stockholm, Sweden. She specializes in permafrost dynamics in relation to climate change and its impact on ecosystems. Address: Department of Earth and Ecosystem Sciences, Division of Physical Geography and Ecosystem Analyses, Lund University, Sölvegatan 12, 223 62 Lund, Sweden. e-mail: margareta.johansson@nateko.lu.se
^*****Kit M. Kovacs leads the biodiversity research program at the Norwegian Polar Institute, and works on marine mammal population biology, ecology and management. Address: Norwegian Polar Institute, 9296 Tromsø, Norway. e-mail: kit@npolar.no
^******Christine Michel is a research scientist at Fisheries and Oceans Canada. Her research focuses on the role of sea ice in Arctic marine ecosystems. Address: Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, MB R3T 2N6, Canada. e-mail: christine.michel@dfo-mpo.gc.ca
^*******Terry Prowse is a senior Research Scientist with Environment Canada and a Professor in the Department of Geography at the University of Victoria. His research focuses on the effects of climate variability and change on cold-regions hydrology, hydro-climatology, and hydro-ecology. Address: Environment Canada, Department of Geography, University of Victoria, Victoria, BC V8P 5C2, Canada. e-mail: terry.prowse@ec.gc.ca
^********James D. Reist is a research scientist at Fisheries and Oceans Canada and works on northern fish ecology. Address: Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, MB R3T 2N6, Canada. e-mail: jim.reist@dfo-mpo.gc.ca
^*********Martin Sharp is chair of Earth and Atmospheric Sciences at the University of Alberta, where he is professor of glaciology working on polar ice caps and glaciers. Address: Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada. e-mail: martin.sharp@ualberta.ca