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<br />Squawfish Population Viability Analysis --July 1993 <br /> <br />Page 20 <br /> <br /> <br />~. <br />" . <br />, .. ~ <br />, .. .. <br />. 'o. <br />. ~ ~ <br />, <br />J. <br /> <br />Figure 2.1. Distribution of the Sacramento squawfish (Ptychocheilus <br />grandis) in the central valley of California <br /> <br />2.4 Dynamic Forces Maintaining Heterozygosity Levels <br /> <br />There are two features of Colorado squawfish ecology and demography <br />that might maintain high H. First, the squawfish is apparently quite mobile <br />and is distributed over a long stretch of river where different selection <br />forces could be acting, presumedly favoring alternative alleles. To the <br />extent these populations mix, heterozygosity will be enhanced. (But one <br />would also detect different allele frequencies at different points in the <br />range, a fact that would be necessary to confirm. The current genetic data <br />are not properly sampled so as to distinguish subpopulation differences.) <br />Second, the high fecundity of the Colorado squawfish means that it could <br />