Christopher Swan is a professor in the Department of Geography and Environmental Systems at the University of Maryland Baltimore County. He is a community ecologist with interests in streams and rivers, in addition to urban ecology. His research projects range from understanding controls on carbon processing in rivers, to mechanisms underscoring biodiversity patterns at multiple spatial scales in both aquatic and terrestrial urban ecosystems, as well as numerous synthesis activities both nationally and internationally.Luz Boyero is a research professor at the University of the Basque Country and the Basque Foundation for Science (Ikerbasque). Her research focuses on how multiple anthropogenic stressors impact the functioning of stream ecosystems, with particular emphasis on how biodiversity loss influences key processes such as plant litter decomposition and nutrient cycling. She coordinates GLoBE, a network of 50+ research teams from all over the world, which join forces to investigate the main patterns and drivers of stream ecosystem functioning at the global scale.Cristina Canhoto is a researcher at the Center for Functional Ecology of the University of Coimbra (CFE-UC) and professor at the Department of Life Sciences, University of Coimbra, Portugal. Over the last 20 years, her work was centered on the functioning of forested streams. She has been mainly focused on the dynamics of litter decomposition and on the physiological and ecological responses of fungal decomposers and leaf consumers in the face of environmental variability and anthropogenic stressors.