Effects of Invasive Non-Native Species on the Native Biodiversity in the River Rhine

This chapter examines the impact of invasive non-native species on the biodiversity in the river Rhine. The occurrence and spread of non-native species are relatively well documented in the Rhine (e.g. Tittizer et al. 2000; Geitler et al. 2002; Rey et al. 2004). Quantitative studies on changes in abundance of non-native species and on species composition of native communities complement these reports (e.g. Van den Brink et al. 1990, 1996; Haas et al. 2002).We review major changes in the biota of the river Rhine, focusing on mechanisms underlying changes in species abundance following the invasion of non-native species. Our emphasis is on benthic macroinvertebrates but interactions with other animals are also considered. Along the way, we identify important gaps in knowledge and suggest areas for further research.