A full credit field course to provide theoretical and practical understanding of the hydrology and ecology of natural, large river ecosystems; interdisciplinary focus of abiotic-biotic interactions via group and individual study; topics to be covered include fluvial geomorphology, open-channel hydraulics, environmental perturbations, habitat survey and sampling design, benthic invertebrate identification and ecology; fish identification and ecology; nutrient/trophic dynamics; impact assessment and river habitat restoration. Emphasis will be on the form and function of large river environments as unique, complex ecosystems by using a stream reach to catchment (landscape) perspective.