In this talk, ecologist Mary Power discusses how herbivorous fish and their predators contribute to the regulation of aquatic ecosystems.

The ecosystem of a river depends on interactions between primary producers, grazers, and predators. These interactions, in turn, are determined by the traits of the species involved and the physical conditions of the river. Power illustrates these principles by describing how species of grazing fish play a critical role in shaping the aquascape of river ecosystems.

This talk is from a 2016 Holiday Lecture Series, Ecology of Rivers and Coasts: Food Webs and Human Impacts.