Factors Affecting Gene Flow between the Host Races of Eurosta solidaginis

  • Joanne K. Itami
  • Timothy P. Craig
  • John D. Horner


Speciation involves the evolution of reproductive isolation between populations (Mayr 1963; Bush 1994). Despite many controversies about how species are defined, and how they evolve, the study of reproductive isolating mechanisms remains central to understanding speciation. Different speciation models make very different assumptions about how reproductive isolation evolves (Mayr 1963; Bush 1975a, 1994; White 1978). Host races and recently evolved sibling species of phytophagous insects offer unique opportunities to study the speciation process. Because the process of speciation is ongoing or recently completed, these extant populations retain the characteristics that were responsible for the evolution of their reproductive isolation. By examining the ecological, behavioral, and genetic characteristics of these populations, we can test assumptions about the evolution of reproductive isolation made in different models of speciation.


Host Plant Gene Flow Emergence Time Reproductive Isolation Assortative Mating 
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Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • Joanne K. Itami
    • 1
  • Timothy P. Craig
    • 1
  • John D. Horner
    • 2
  1. 1.Department of Life SciencesArizona State University WestPhoenixUSA
  2. 2.Department of BiologyTexas Christian UniversityFort WorthUSA

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