Habitat Suitability Index Models: Cutthroat Trout

Cutthroat trout, Salmo clarki, are a polytypic species consisting of
several geographically distinct forms with a broad distribution and a great
amount of genetic diversity (Hickman 1978; Behnke 1979). Behnke (1979)
recognized 13 extant subspecies: Coastal cutthroat (S. c. clarki) in coastal
streams from Prince William Sound, Alaska to the Eel Rlver in California;
mountain cutthroat (S.c. alpestris) in upper Columbia and Fiaser River
drainages of British Columbia; west slope cutthroat (S. c. lewisi) in the
upper Columbia, Salmon, Clearwater, South Saskatchewan and upper Missouri
drainages of Montana and Idaho; an undescribed subspecies in the Alvord basin, Oregon; Lahonton cutthroat (S. c ..henshawi), Pauite cutthroat (S. c.
seleniris), and an undescribed- subspecies in the Humboldt River drafnage of
the Lahontan basin of Nevada and California; Yellowstone cutthroat (S. c.
bouvieri) in the Yellowstone drainage of Wyoming and Montana and the Snake
River drainage of Wyoming, Idaho, and Nevada; an undescribed subspecies (fine spotted) in the upper Snake River, Wyoming; Bonneville cutthroat (S. c. utah) in the Bonneville basin in Utah, Nevada, Idaho, and Wyoming; Colorado River cutthroat (S. c. pleuriticus) in the Colorado River drainage in Wyoming, Utah, New Mexico, and Colorado; greenback cutthroat (S. c. stomias) in the South Platte and Arkansas River systems; and Rio Grande cutthroat (S. c. virginalis) in the Rio Grande River drainage of Colorado and New Mexico. Many of these 13 subspecies are included on Federal or State endangered or threatened species lists.