Lecture 17 BIO220

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Unformatted text preview: low Ne should be seen New Male Wolf Arrives His offspring 100 12 50 8 4 0 0 1983 1991 Number of breeding packs Estimated population size •A single immigrant wolf arrives in 1991... •What are the consequences? Population a single breeding pack Split into > 1 breeding pack 2001 25 Vila et al. 2003 Proc Roy Soc B 270: 91 97 26 Vila et al. 2003,Proc Roy Soc B 270: 91 97 Before: Heterozygosity was decreasing because related i ndividuals were mating, p romoting homozygosity Introducing the male STOPS t he decline of h eterozygosity! A single individual can eliminate inbreeding “We show here that the genetic diversity of the severely bottlenecked and geographically isolated Scandinavian population of grey wolves (Canis lupus), founded by only two individuals … was recovered by the arrival of a single immigrant.” Immigrated to Isle Royale in Lake Superior, on his own 27 Vila et al. 2003,Proc Roy Soc B 270: 91 97 Adams J R et al. Proc. R. Soc. B 2011. 278:3336-3344 28 -ONE introduced individual has the power to allow the p opulation to recover from the extreme bottleneck Adams J R et al. Proc. R. Soc. B 2011;278:3336-3344 Are these effects sustainable? • Wolves, chickens, adders, panthers all face substan...
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