1. F. Brieger (), J.-L. Kämmerle and R. Hagen, Forest Res. Inst. of Baden-Württemberg, Division of Wildlife Ecology, Wonnhaldestraße 4, DE-79100 Freiburg, Germany. FB and JLK also at: Chair of Wildlife Ecology and Management, Univ. of Freiburg, Freiburg, Germany.
2. N. Martschuk, Inst. of Biology I (Zoology), Univ. of Freiburg, Freiburg, Germany.
3. S. Ortmann, Dept. Evolutionary Ecology, Leibniz Inst. for Zoo and Wildlife Research, Berlin, Germany.