Draft Recovery Plan for the Bruneau Hot Springsnail (Pyrgulopsis bruneauensis)

摘要

The Bruneau hot springsnail (Pyrgulopsis bruneauensis) as listed as endangered onJune 17, 1998 (FR 63 32981). The species currently survives in approximately 89, out of 155, small, flowing geothermal springs and seeps along an approximately 6.9-kilometer (4.3-mile) reach of the Bruneau River and its tributary Hot Creek in southwestern Idaho. The Bruneau hot springsnail has been found in flowing geothermal springs and seeps with temperatures ranging from 15.7 to 36.9 degrees Celsius (60.3 to 98.4 degrees Fahrenheit), with the highest densities of springsnails noted at temperatures ranging from 22.8 to 36.6 degrees Celsius (73 to 98 degrees Fahrenheit). Bruneau hot springsnails are found in these habitats on the exposed surfaces of various substrates, including rocks, gravel, sand, mud, and algal film. The principal threat to this species is the reduction and/or elimination of their geothermal spring habitat as a result of agricultural-related groundwater withdrawal and pumping.