If the temperature of a stream rises too high, the animals that live in the stream may find it difficult to survive. Big changes in a stream’s daytime temperature as compared with its nighttime temperature may also cause a problem for aquatic animals. The scientists in this study were interested in answering three questions: (1) How does the shape of a stream affect its daytime water temperature? (2) How does the shape of a stream affect the difference between its daytime and nighttime water tem Topics: Active Forest Management, Water, Groundwater, Habitat, Rainfall, Streams, Temperature, Watershed.