While this female lays small clutches of eggs near the plant's tip, females of the same species, Euphydryas editha, from allopatric populations that specialize on a different host plant, lay large clutches near the ground. Field studies (see McBride and Singer, e1000529) show that "hybrids" have intermediate traits that cause them to suffer reduced fitness, revealing a form of reproductive isolation can provide a substantial barrier to gene flow at the early stages of ecological divergence and speciation.
Image Credit: Damien Caillaud, University of Texas at Austin
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