Rapid sexual and genomic isolation in sympatric<i>Drosophila</i>without reproductive character displacement is a research paper published in Ecology and Evolution (2018). On theSindex it has a DataRank of 0.398. It has been cited 11 times, with 5 citing works in its 1-hop citation network.
AbstractThe rapid evolution of sexual isolation in sympatry has long been associated with reinforcement (i.e., selection to avoid maladaptive hybridization). However, there are many species pairs in sympatry that have evolved rapid sexual isolation without known costs to hybridization. A major unresolved question is what evolutionary processes are involved in driving rapid speciation in such cases. Here, we focus on one such system; theDrosophila athabascaspecies complex, which is composed of three partially sympatric and interfertile semispecies:WN,EA, andEB. To study speciation in this species complex, we assayed sexual and genomic isolation within and between these semispecies in both sympatric and allopatric populations. First, we found no evidence of reproductive character displacement (RCD) in sympatric zones compared to distant allopatry. Instead, semispecies were virtually completely sexually isolated from each other across their entire ranges. Moreover, using spatial approaches and coalescent demographic simulations, we detected either zero or only weak heterospecific gene flow in sympatry. In contrast, within each semispecies we found only random mating and little population genetic structure, except between highly geographically distant populations. Finally, we determined that speciation in this system is at least an order of magnitude older than previously assumed, withWNdiverging first, around 200K years ago, andEAandEBdiverging 100K years ago. In total, these results suggest that these semispecies should be given full species status and we adopt new nomenclature:WN—D. athabasca,EA—D. mahican, andEB—D. lenape. While the lack ofRCDin sympatry and interfertility do not support reinforcement, we discuss what additional evidence is needed to further decipher the mechanisms that caused rapid speciation in this species complex.
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Base Score Contribution
0.373
From this paper's citation signal
Citation Network Contribution
0.0252
From 3 citing papers with measurable signal
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DataRank blends this paper's own citation count with the influence of the papers that cite it. Here, roughly 94% comes from its base citations and 6% from the citation network (3 citing papers contributed measurable signal).
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