1 Wildlife Ecology Research Group, Biotechnical Faculty, University of Ljubljana, SI-1001, Ljubljana, Slovenia.
2 Nelson Institute for Environmental Studies, University of Wisconsin, Madison, WI 53706, USA.
3 Trophic Cascades Program, Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR 97331, USA.
4 Grimsö Wildlife Research Station, Swedish University of Agricultural Sciences, 73091, Riddarhyttan, Sweden.
5 Grimsö Wildlife Research Station, Swedish University of Agricultural Sciences, 73091, Riddarhyttan, Sweden. Research Unit of Biodiversity (UO/CSIC/PA), Oviedo University, 33600, Spain. jv.lopezbao@gmail.com.