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<br /> <br />SOUU~/CHAPTER 9 <br />THRESHOLDS FOR SURVIVAL <br /> <br />unrealistic to hope that isolation between reserves (using an island <br />model) can substitute for within-reserve isolation, because the extinction <br />rates within reserves are too high to justify expectation of long-term sur- <br />vival. One measure mitigating the extinction problem is artificial gene <br />flow between reserves, but this will impede local adaptation and prevent <br />speciation. <br /> <br />SUGGESTED READINGS <br /> <br />Refer to the Suggested Readings given in Chapter 8. <br /> <br />169 <br />