1. Institute of Landscape Ecology and Resources Management; Giessen University; Germany
2. German Federal Environment Agency (UBA); Dessau Germany
3. Institute of AgroEcology, RLP AgroScience; Neustadt/Weinstraße Germany
4. Fraunhofer Institute of Molecular Biology and Applied Ecology; Schmallenberg Germany
5. RWTH Aachen University; Aachen Germany
6. Footways S.A.S., Orléans Cedex 2; France