Abisko Scientific Research Station Abisko SE 981-07, Sweden

Department of Cell and Organism Biology Lund University, Solvegatan 35 SE-22362, Lund, Sweden

A.N. Severtsov Institute of Evolutionary Morphology and Animal Ecology Russian Academy of Sciences Staromonetny per. 29 Moscow 109017, Russia

Institute of Arctic Biology University of Alaska Fairbanks, AK 99775, USA

Department of Physical Geography and Ecosystem Analysis Geo Biosphere Science Centre Lund University, Sweden

School of Biological and Biomedical Sciences University of Durham, UK

Institute of Biology University of Tromso N-9037 Tromso, Norway

Abisko Scientific Research Station Abisko, SE 981-07, Sweden

Centre for Maori and Indigenous Planning and Development P.O. Box 84, Lincoln University Canterbury, New Zealand

Physiological Ecology Group Botanical Institute, University of Copenhagen Oester Farimagsgade 2DDK-1353 Copenhagen K, Denmark

Komarov Botanical Institute Russian Academy of Sciences Popova Str. 2 St. Petersburg 197376, Russia

Stevens Technical University Castle Point on Hudson Hoboken, NJ 07030, USA

Professor of Biology and Director Global Change Research Group San Diego State University San Diego, CA 92182, USA

The Ecosystems Center Marine Biological Laboratory Woods Hole, MA 02543 USA

Potsdam Institute for Climate Impact Research (PIK) Telegrafenberg P.O. Box 601203 D-14412 Potsdam, Germany