About 0.02% of the water on Earth is found in rivers and lakes. Yet most of the human population lives in close proximity to these freshwater ecosystems, especially rivers, and rivers and lakes have been gems for ecological and evolutionary studies for centuries. Much of the research in my lab uses rivers as a study system to discover how trait-based effects of one or several species affect the 1) phenotypic traits of other species, 2) community interactions, and 3) ecosystem functions, such as carbon flow and nutrient cycling.