Publisher's Note This publication is based primarily on a workshop held at the Fraunhofer Institute for Environmental Chemistry and Ecotoxicology in Schmallenberg-Grafschaft, Federal Republic of Germany, in July 1985. The thirteen papers and eight case studies in this collection examine the ecotoxicological principles applicable to climatic conditions found in regions other than the temperate zones. Presents data from the tropical, arid, sub-polar, and high mountain regions on the fate of environmental chemicals and the response of ecosystems to chemical stress. They also point the way to future research and monitoring.