1. National Food Safety and Toxicology Center, Department of Zoology, Institute for Environmental Toxicology, Michigan State University, East Lansing, Michigan, Dipartimento di Scienze Ambientali, Università di Siena, I-53100 Siena, Italy, Department of Environmental Chemistry and Ecotoxicology, University of Gdańsk, 18 Sobieskiego Str., PL 80-952 Gdańsk, Poland, and Martin Luther Universistät Halle-Wittenberg, Institut fur Zoologie, Standort Kröllwitzer Strasse 44, D-06099, Halle, Germany