ENDANGERED SPECIES ACT PROFILE

PROTECTION STATUS: Not listed; candidate species

PETITIONED: 2000

YEAR PLACED ON LIST: Candidate 2003

RANGE: Sierra Nevada Mountains of California and Nevada, from southern Plumas County to southern Tulare County

THREATS: Predation by introduced trout, pesticides, environmental changes from drought and global warming, disease, and habitat degradation due to livestock grazing

POPULATION TREND: More than 93 percent of northern and central Sierra Nevada populations, and more than 95 percent of southern Sierra Nevada and southern California populations, are already extinct.