The central aim of this project is to study how species traits translate in community patterns with special attention for dispersal. In this functional community approach we focus on pesticide stress (endosulfan) and its potential interactions with predator stress (fish) in water boatmen. We measure the species-specific sensitivities to the pesticide in the presence and absence of predator stress using biomarkers, organismal traits (growth, survival, swimming speed) measured in laboratory experiments, survival and growth in outdoor mesocosm experiments in the absence and presence of dispersal. All this information will be combined to assess to what extent biomakers covary with each other and higher levels of biological organisation.