1. School of Geography, Earth and Environmental Sciences; Univ. of Birmingham; B15 2TT UK
2. 2CE3C - Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Univ. dos Açores - Depto de Ciências Agráriase Engenharia do Ambiente; Açores Portugal
3. Inst. of Arctic Biology; Univ. of Alaska; Fairbanks AL USA