When vegetation types and patterns change, so do the ways in which water flows. Thus, ecohydrology is the study of the influence of dynamic hydrology, hydraulics, and geomorphology on stream ecosystems, particularly nutrient cycling, primary productivity, and trophic interactions. See Wilcox et al. (2011) Geog. Compass DOI: 10.1111/j.1749-8198.2011.00413.x, on dryland ecohydrology, giving clear and practical insights into this field.