1Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy 2Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-3114, USA 3Department of Terrestrial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, 6708 PB Wageningen, Netherlands 4Institute for Zoology, University...