Mesohabitats, Fish Assemblage Composition, and Mesohabitat Use of the Rio Grande Silvery Minnow Over a Range of Seasonal Flow Regimes in the Rio Grande/Rio Bravo del Norte, In and Near Big Bend National Park, Texas, 2010-11

摘要

In 2010-11, the U.S. Geological Survey (USGS), in cooperation with the U.S. Fish and Wildlife Service, evaluated the physical characteristics and fish assemblage composition of mapped river mesohabitats at four sites on the Rio Grande/Rio Bravo del Norte (hereinafter Rio Grande) in and near Big Bend National Park, Texas. The four sites used for the river habitat study were colocated with sites where the U.S. Fish and Wildlife Service has implemented an experimental reintroduction of the Rio Grande silvery minnow (Hybognathus amarus), a federally listed endangered species, into part of the historical range of this species.