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1 <br />1 <br />1 <br />1 <br /> <br /> <br />1 <br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br />1 <br /> <br />1 <br /> <br />Table 6. Estimates of N based on genetic effective population size (Ne). Mb:Fb is the sex ratio of <br />breeding males to breeding females where, Mb is the number of breeding males and Fb is the <br />number of breeding females. Nb is the number of breeding individuals needed to maintain an Ne of <br />1000 given a particular sex ratio, and Ng is the minimum number of individuals needed to maintain <br />an Ne of 1000 based on sex ratio and Ne/N. <br />SPECIES/ Population' N. K:Fb Mb Fb Nb Ne/N Ng <br />Colorado Squawfish <br />Yampa River 1000 4.5:1 1385 305 1690 0.5 3380 <br />Desolation/Gray Canyons 1000 4.5:1 1385 305 1690 0.5 3380 <br />Upper Colorado River 1000 4.5:1 1385 305 1690 0.5 3380 <br />Razorback sucker <br />Middle Green River 1000 3:1 1000 330 1330 0.5 2660 <br />Lower Green River 1000 3:1 1000 330 1330 0.5 2660 <br />Upper Colorado River 1000 3:1 1000 330 1330 0.5 2660 <br />Humpback chub <br />Yampa River 1000 1:1 500 500 1000 0.5 2000 <br />Desolation/Gray Canyons 1000 1:1 500 500 1000 0.5 2000 <br />Black Rocks Canyon 1000 1:1 500 500 1000 0.5 2000 <br />West Water Canyon 1000 1:1 500 500 1000 0.5 2000 <br />Cataract Canyon 1000 1:1 500 500 1000 0.5 2000 <br />Bonjddl <br />Upper-Colorado Basin 1000 1:1 500 500 1000 1 0.5 2000 <br />1) Populations identified in this table are subject to change with revisions of the UBRIP <br />Genetics Management Plan (Wydoski 1995). <br />20 <br />J