Experimental hybridization in allopatric species of the Drosophila repleta group (Diptera, Drosophilidae): implications in the mode of speciation

The Pleistocene refugia theory proposes that recurrent expansions and contractions of xerophytic vegetation over climate change periods affected the evolution of cactophilic Drosophila in South American continent. The resulting demographic fluctuations linked to the available patches of vegetation should have been prone to bottlenecks and founder events, affecting the fate of gene pool dynamics. However, these events also promoted the diversification of cacti, creating an ecological opportunity for host specialization. We tested the hypothesis of ecological speciation in the D. buzzatii group. We assessed adaptive footprints and examined the genetic architecture of fitness related traits in the sibling allopatric species D. koepferae and D. antonietae. Overall our results are in line with the idea that these species evolved under different ecological scenarios. Joint-scaling analysis comparing both species and their hybrids revealed that additive genetic variance was the major contribu...