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genetic isolation between two sympatric host-plant races of the european corn borer, ostrinia nubilalis hübner. i. sex pheromone, moth emergence timing, and parasitism.adaptation to different environments may be a powerful source of genetic differentiation between populations. the biological traits selected in each environment can pleiotropically induce assortative mating between individuals of these genetically differentiated populations. this situation may facilitate sympatric speciation. successful host shifts in phytophagous insects provide some of the best evidence for the ecological speciation that occurs, or has occurred, in sympatry. the european corn ...200312683523
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