This book series provides comprehensive information on distribution and ecological preferences of European freshwater organisms. The first volume summarises the current knowledge on European caddisflies (Trichoptera), based on the evaluation of over 1,400 literature references. The distribution within the European ecoregions (including Turkey and the Caucasian region) is given for 1,426 European Trichoptera species and subspecies, categorised into 136 genera and 23 families. A wide variety of ecological preferences is presented as numerical codes, including feeding types, habitat and current preferences, temperature and altitude preferences, life duration and flight periods, and the response to environmental stress. The compilation is a unique tool for analysing freshwater biota, both for basic and applied purposes such as ecosystem monitoring and the implementation of European directives in the field of environmental protection.