Editors: Jeffrey Giddings, Theo Brock, Wolfgang Heger, Fred Heimbach, Steve Maund, Steve Norman, Hans Toni Ratte, Christoph Schäfers, Martin Streloke
Aquatic microcosms and mesocosms are highly complex test systems. Often, the test systems have a unique character, and consequently data interpretation requires expert knowledge. Some regulatory authorities emphasize these types of studies to demonstrate that there is no unacceptable risk; others tend to take a more critical view of mesocosm studies. For these reasons, the evaluation and interpretation of aquatic microcosm and mesocosm studies have become a subject of wide-ranging discussion. This report describes the present state of the art for aquatic microcosm and mesocosm studies and discusses many issues regarding experimental design, data interpretation, and implementation in risk assessment.