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<br /> Table 5. Presence and relative abundance of roundtail chub by time period and river basin. (A=abundant, C=common, R=rare, P=present, relative <br /> abundance unlrnown, -=not present, E=extirpated , RP=repatriated, U=distribution undescribed for basin. River basins without historical collection <br /> records*are assumed to have maintained historic populations if more recent collections have documented presence of roundtail chubl. <br /> Lower Colorado pre-1930 1.930-1955 1956-1980 1981-Present <br /> River Basin <br />E <br /> Colorado River P* P P <br /> Gila River A A C R <br /> Bill Williams River P* P* P P <br /> Virgin River - - - <br />"'n Little Colorado River P P* P* P <br /> <br />~ Upper Colorado <br /> River Basin <br />~ Colorado River P P A C <br /> Green River P A C R <br /> <br /> San Juan River P A C R <br />~ <br /> Escalante, Dirty Devil, P* P* P P <br /> San Rafael, Price, and <br /> Duchesne rivers <br /> Gunnison and A A C C <br /> Dolores rivers <br /> White River P* P* C C <br /> Yampa River P* A A C <br />w <br />0 <br />