1. Laboratory of Functional Ecology Institute of Biology University of Neuchâtel Neuchâtel Switzerland
2. Landscape Ecology Institute of Terrestrial Ecosystems Department of Environmental System Science ETH Zürich Zürich Switzerland
3. Swiss Federal Institute for Forest, Snow and Landscape Research WSL Birmensdorf Switzerland
4. Neuchâtel Platform of Analytical Chemistry University of Neuchâtel Neuchâtel Switzerland