Research Station ART, Zürich CH-8046, Switzerland;
Institute of Ecology and Evolution, University of Bern, Bern CH-3012, Switzerland;
Institute for Environmental Sciences, University of Koblenz-Landau, LandaulPfalz D-76829, Germany;
Institute of Ecology and Evolution, University of Bern, Bern CH-3012, Switzerland;
Research Station ART, Zürich CH-8046, Switzerland;
Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Bern CH-3013, Switzerland;
Institute for Environmental Sciences, University of Koblenz-Landau, LandaulPfalz D-76829, Germany;