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By studying the genetic causes of partial reproductive isolation between specialized ecological races, early barriers to gene flow can be identified before they become confounded with other species differences.

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Below are the most common reasons: This site uses cookies to improve performance by remembering that you are logged in when you go from page to page.To provide access without cookies would require the site to create a new session for every page you visit, which slows the system down to an unacceptable level.The role of natural selection in speciation, first described by Darwin, has finally been widely accepted.Yet, the nature and time course of the genetic changes that result in speciation remain mysterious.To date, genetic analyses of speciation have focused almost exclusively on retrospective analyses of reproductive isolation between species or subspecies and on hybrid sterility or inviability rather than on ecologically based barriers to gene flow.However, if we are to fully understand the origin of species, we must analyze the process from additional vantage points.