Foreword: Global change and river ecosystems—implications for structure, function, and ecosystem services.- Understanding effects of global change on river ecosystems: science to support policy in a changing world.- Biogeochemical implications of climate change for tropical rivers and floodplains.- Dynamics of a benthic microbial community in a riverine environment subject to hydrological fluctuations (Mulargia River, Italy).- Global changes in pampean lowland streams (Argentina): implications for biodiversity and functioning.- Factors regulating epilithic biofilm carbon cycling and release with nutrient enrichment in headwater streams.- Periphyton biomass and ecological stoichiometry in streams within an urban to rural land-use gradient.- The physico-chemical habitat template for periphyton in alpine glacial streams under a changing climate.- The periphyton as a multimetric bioindicator for assessing the impact of land use on rivers: an overview of the Ardières-Morcille experimental watershed (France).- Discharge and the response of biofilms to metal exposure in Mediterranean rivers.- Effects of eutrophication on the interaction between algae and grazers in an Andean stream.- Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream.- Global change and food webs in running waters.- Effects of hydromorphological integrity on biodiversity and functioning of river ecosystems.- Organic matter availability during pre- and post-drought periods in a Mediterranean stream.- Flow regime alteration effects on the organic C dynamics in semiarid stream ecosystems.- A multi-modeling approach to evaluating climate and land use change impacts in a Great Lakes River Basin.- Implications of global change for the maintenance ofwater quality and ecological integrity in the context of current water laws and environmental policies.