Alternative Mating Tactics as Potential Prezygotic Barriers to Gene Flow Between Two Sister Species of Frugivorous Fruit Flies

摘要: Rhagoletis completa Cresson and zoqui Bush, are two sister species in the suavis group that were thought to occupy non-overlapping geographical ranges. Recent discovery of a contact zone North Eastern Mexico where natural interspecific hybrids with intermediate morphotypes can be found has led laboratory studies small enclosures failed identify existence reproductive barriers capable maintaining genetic integrity both species. Because experimental approach used such could have interfered behavior flies, series additional mating compatibility tests under much less restrictive conditions performed. Our observations, confirmed fact males females engage matings. However, R. more reluctant heterospecific matings than females, revealing asymmetries sexual isolation. Also, careful scrutiny male guarding specific partitioning location unveiled subtle differences result isolation if reinforced during secondary contact.