Most freshwater ecosystems in the United States are in a state of collapse. Existing management efforts take a piecemeal approach, addressing individual stressors, managing the systems for individual benefits, and protecting individual species. These disjointed efforts are doomed to fail. Both...

Ecosystem externalities arise when one use of an ecosystem affects its other uses through the production functions of the ecosystem.We use simulations from a size-spectrum ecosystem model to investigate the ecosystem externality created by fishing of multiple species. The model is based upon...