The ecosystem of a river depends on complex interactions between primary producers, grazers, and predators, which in turn are determined both by the traits of the individual species involved and the physical conditions of the river. River ecologist Dr. Mary Power illustrates these principles by describing how the dominant grazing fishes in a river ecosystem play a critical role in forming the aquascape.
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Two leading ecologists describe the complex interactions between species and their environment in aquatic ecosystems. Using field experiments, the researchers illustrate how interactions among organisms such as fish, crab, insects, snails, and algae determine the vitality of rivers and coastal...