However, it is well known that temperatures influence the development of individual invertebrate species i.e. the thermal-time or degree day concept. Previous studies investigating interactions between temperature and contamination have primarily been using single-species test systems. Although, single-species-based ecotoxicological data are essential for a present time ecological risk assessment, they do not allow for the assessment of community-level effects caused by species interactions e.g. predation, mutualism, competition, etc. Such interaction combined with known species differences in optimum temperatures limits the ability of single species data to predict effects of climate change on communities.