Ecological Adaptation and Speciation: The Evolutionary Significance of Habitat Avoidance as a Postzygotic Reproductive Barrier to Gene Flow

Table 4

Studies presenting data consistent with habitat avoidance alleles causing problems in hybrids. Each cross-generated hybrids displaying reduced response relative to parents in habitat choice. Host plant or locality information is in parentheses.

Taxon	Hybrid cross	Reduced hybrid response	Reference
Rhagoletis fruit flies	R. pomonella (apple) × R. pomonella (haw)	Upwind flight to host odor	[82]
Rhagoletis fruit flies	R. pomonella (apple) × R. nr. pomonella (dogwood)	Upwind flight to host odor	[82]
Rhagoletis fruit flies	R. pomonella (haw) × R. nr. pomonella (dogwood)	Upwind flight to host odor	[82]
Rhagoletis fruit flies	R. pomonella (apple) × R. mendax (blueberry)	Electroantennogram to fruit odor	[43]
Neochlamisus leaf beetles	N. bebbianae (maple) × N. bebbianae (willow)	Time spent on foraging on parental host plants	Egan and Funk, unpubl.; [83]
Leptopilina parasitoids	L. boulardi (Nasrallah) × L. boulardi (Brazzaville)	Probing response to fruit odor^1	[84]

¹ Only in one direction of the F1 hybrid cross (Nasrallah female × Brazzaville male).