GENETIC INCOMPATIBILITY BETWEENPIERIS CALLIDICEANDPIERIS OCCIDENTALIS NELSONI: DIFFERENTIATION WITHIN A PERIGLACIAL RELICT COMPLEX (LEPIDOPTERA: PIERIDAE)

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Abstract
Pieris callidicefrom the French Alps was hybridized with the phenotypically similarP.occidentalis nelsonifrom Fairbanks, Alaska in order to examine the degree of genetic divergence within a group of Pleistocene origin. Egg hatch for the crossnelsonimale ×callidicefemale was zero. In the reciprocal cross, egg hatch was normal, but most of the larvae failed to feed on the normal host-plant ofnelsoni, and died. The hybrid pupae and the single adult were intermediate between the parents. It is inferred thatP.callidiceandP.o.nelsoniare more divergent genetically and physiologically than phenotypically.