Biological invasions in rivers and associated ecosystems: New insights, challenges, and methodological advancements

The spread and successful establishment of invasive non-native species (INNS) is a key driver of lotic ecosystem degradation globally within the Anthropocene era. Despite historic interest in biological invasions, tackling INNS remains a key challenge for managers of freshwater systems and a continued focus of international research. Spanning nine countries, four continents and four biogeographic regions this special issue illustrates the range of research being undertaken in this interdisciplinary field. The contributions highlight key advances in the identification of abiotic and biotic factors which may facilitate / enable the spread of INNS, alongside novel methodological developments in monitoring and managing INNS. New insights into the potential implications of INNS establishment for the receiving ecosystem and future challenges are also presented. Despite the wealth of research focused on riverine and associated ecosystem invasions, INNS remain an ongoing threat to global ecosystem health, with future invasions and geographical ranges continuing to evolve through anthropogenic modification of habitats and climatic change.