Abstract
The Hawaiian Drosophila are one of the most species-rich endemic groups in Hawaii and a spectacular example of adaptive radiation. Drosophila silvestris and D. heteroneura are two closely related picture-winged Drosophila species that occur sympatrically on Hawaii Island and are known to hybridize in nature, yet exhibit highly divergent behavioral and morphological traits driven largely through sexual selection. Their closest-related allopatric species, D. planitibia from Maui, exhibits hybrid male sterility and reduced behavioral reproductive isolation when crossed experimentally with D. silvestris or D. heteroneura. A modified four-taxon test for gene flow was applied to recently obtained genomes of the three Hawaiian Drosophila species. The analysis indicates recent gene flow in sympatry, but also, although less extensive, between allopatric species. This study underscores the prevalence of gene flow, even in taxonomic groups considered classic examples of allopatric speciation on islands. The potential confounding effects of gene flow in phylogenetic and population genetics inference are discussed, as well as the implications for conservation.
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Supplementary material 1
Different demographic models in ABBA/BABA simulations (PNG 50Â kb)
Supplementary material 2
Phylogenetic tree of Hawaiian Drosophila species, adapted from (Kang et al. 2016) Fig. 1 (PNG 123 kb)
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Kang, L., Garner, H. ., Price, D.K. et al. A Test for Gene Flow among Sympatric and Allopatric Hawaiian Picture-Winged Drosophila . J Mol Evol 84, 259–266 (2017). https://doi.org/10.1007/s00239-017-9795-7
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DOI: https://doi.org/10.1007/s00239-017-9795-7
Keywords
- Reproductive isolation
- Hybridization
- Drosophila silvestris
- Drosophila heteroneura
- Hawaii