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ecohydrology

n. The study of the ecological processes associated with hydrology

Wikipedia
Ecohydrology

Ecohydrology (from Greek , oikos, "house(hold)"; , hydōr, "water"; and , -logia) is an interdisciplinary field studying the interactions between water and ecosystems. These interactions may take place within water bodies, such as rivers and lakes, or on land, in forests, deserts, and other terrestrial ecosystems. Areas of research in ecohydrology include transpiration and plant water use, adaption of organisms to their water environment, influence of vegetation on stream flow and function, and feedbacks between ecological processes and the hydrological cycle.