U.S. Geological Survey: Climate change and growing human demands for water are leaving an indelible mark on rivers and streams, shortening food chains and eliminating some top predators like large-bodied fish, according to a new study led by Arizona State University and co-authored by a U.S. Geological Survey scientist. The team studied the food webs of 36 rivers and streams in the United States, ranging in size from the Mississippi and Colorado Rivers to their small tributaries. The study found changes in …