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Host fidelity is an effective premating barrier between sympatric races of the apple maggot fly.
TLDR
The results verify that host-associated adaptation can produce reproductive isolation as a correlated character (a key premise of sympatric speciation) and represents one of the few or perhaps only example in animals where the intra-specific isolating effects of specific phenotypes have been quantified in nature. Expand
Selective maintenance of allozyme differences among sympatric host races of the apple maggot fly.
TLDR
The findings confirm that postzygotic reproductive isolation can evolve as a pleiotropic consequence of host-associated adaptation, a central tenet of nonallopatric speciation and suggest that one reason for the paucity of reported fitness trade-offs is a failure to consider adequately costs associated with coordinating an insect's life cycle with the phenology of its host plant. Expand