Our research examines mechanisms of community assembly, species extirpations and invasions, food-web structure and dynamics, and ecosystem function. Our fish-centric program seeks to test and advance ecological concepts, while maintaining direct application to pressing problems in conservation biology and the sustainable use of natural resources. Freshwater ecosystems are excellent settings for our research because of their high biodiversity and endemism, social and economic importance, and unparalleled impacts to their habitats and species. Current field settings include intermittent streams, large floodplain rivers, and coastal lagoon ecosystems.