Geographic distance versus genetic difference.

(a) The relationship between geographic distance (km) and genetic distance (FST) based on populations of cutthroat trout within the Bonneville Basin and upper Snake River. (Mantel test, r = 0.31, p = 0.0020). (b) The relationship between geographic distance (km) and genetic distance (FST) based on populations of cutthroat trout in each watershed within the Bonneville Basin and upper Snake River. Solid circles and solid line represent the Portneuf River watershed (Mantel test, r = 0.30, p = 0.022), open circles and dotted line represent the Raft River watershed (Mantel test, r = 0.085, p = 0.26, and open triangles and dashed line represent the Malad River watershed (Mantel test, r = 0.37, p = 0.52).