1. Research Station Agroscope Reckenholz-Tänikon; Reckenholzstr. 191; CH-8046; Zurich; Switzerland
2. ARNAL; Office for Nature and Landscape; Kasernenstr. 37; CH-9100; Herisau; Switzerland
3. Institute for Landscape Ecology; University of Munster; Robert-Koch-Str. 28; 48149; Munster; Germany