Abstract
Five generations of mass selection reduced “obligate” diapause, critical photo-period, and diapause intensity in a strain of the anise swallowtail, Papilio zelicaon Lucas. Reciprocal crosses made between the selected line and unselected uni-and multivoltine populations produced hybrids with diapause induction and intensity intermediate to parental values. The results suggest polygenic inheritance of induction and intensity. Differences in response between reciprocal hybrids indicate the presence of maternal effects on diapause induction. It is proposed that the genetic variance underlying the diapause trait and the switch to non-native host plants have facilitated the evolution of multivoltinism in P. zelicaon.
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