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Adaptive Genetic Variation

  • David B. Neale
  • Nicholas C. Wheeler
Chapter

Abstract

Forest geneticists have a strong interest in understanding the distribution and patterning of genetic variation across forest landscapes, the nature of which is shaped by demographic (mating system, gene flow, and genetic drift) and adaptive (natural selection) processes. In Chap.  8, we discussed how these combined forces have resulted in patterns as revealed by common-garden studies. Such studies have been extremely important in guiding seed transfer and reforestation activities but do not explicitly disambiguate between the relative roles of demographic versus adaptive processes. One reason for this lack of clarity is that in common gardens highly polygenic traits are generally evaluated where the patterning of some individual genes reflects demographic processes and for others it is reflective of adaptive processes. To begin to separate the relative roles of demography versus adaptation, we discussed results obtained from neutral-marker studies in Chap.  9. In Chap.  11, we discuss genomic methods to dissect polygenic adaptive traits into their individual gene components. In this chapter, we turn our attention to studies that determine which genes may be nonneutral and thus underlie adaptive patterns of variation based on information in DNA sequences alone.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • David B. Neale
    • 1
  • Nicholas C. Wheeler
    • 2
  1. 1.Department of Plant SciencesUniversity of California, DavisDavisUSA
  2. 2.ConsultantCentraliaUSA

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