1. Private Laboratory; Am See 27; D-78465; Constance; Germany
2. Department of Ecology; University of Kaiserslautern; Erwin-Schrödinger-Strasse 14; D-67663; Kaiserslautern; Germany
3. Department of Organismic Biology; University of Salzburg; Hellbrunnerstrasse 34; A-5020; Salzburg; Austria