1. Institute of Geography, Univ. of Innsbruck, Innrain 52f, A-6020 Innsbruck, Austria; and Institute of Ecology, Univ. of Innsbruck, Sternwartestraße 15, A-6020 Innsbruck, Austria (corresponding author).
2. Professor, Institute of Geography, Univ. of Innsbruck, Innrain 52f, A-6020 Innsbruck, Austria.
3. Dept. of Natural Hazards, BFW, Rennweg 1, A-6020 Innsbruck, Innsbruck, Austria.
4. Institute of Ecology, Univ. of Innsbruck, Sternwartestraße 15, A-6020 Innsbruck, Austria.
5. Assistant Professor, Institute of Ecology, Univ. of Innsbruck, Sternwartestraße 15, A-6020 Innsbruck, Austria.