Evolution of mating isolation between populations of Drosophila ananassae |
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Authors: | Schug Malcolm D Baines John F Killon-Atwood Amanda Mohanty Sujata Das Aparup Grath Sonja Smith Shelly G Zargham Shiva McEvey Shane F Stephan Wolfgang |
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Affiliation: | Biology Department, University of North Carolina Greensboro, Greensboro, NC 27402, USA,;Section of Evolutionary Biology, Department of Biology, Ludwig-Maximilians University, 82152 Planegg-Martinsried, Germany,;The Australian Museum, Sydney, NSW 2010, Australia,;National Institute of Malaria Research (ICMR), 22, Sham Nath Marg, New Delhi 110054, India,;Department of Biotechnology, Jaypee Institute of Information Technology University, Noida 201307, India |
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Abstract: | Prezygotic mating isolation has been a major interest of evolutionary biologists during the past several decades because it is likely to represent one of the first stages in the transition from populations to species. Mate discrimination is one of the most commonly measured forms of prezygotic isolation and appears to be relatively common among closely related species. In some cases, it has been used as a measure to distinguish populations from subspecies, races, and sister species, yet the influences of various evolutionary mechanisms that may generate mate discrimination are largely unknown. In this study, we measured the level and pattern of mate discrimination among 18 populations of a cosmopolitan drosophilid species, Drosophila ananassae , from throughout its geographical range and its sister species, Drosophila pallidosa, which has a restricted geographical distribution in the South Pacific Islands. In addition, we measured genetic differentiation between all 18 populations using mitochondrial DNA polymorphism data. Mate discrimination varies considerably throughout the species range, being higher among populations outside the ancestral Indonesian range, and highest in the South Pacific. Our results suggest that colonization and genetic differentiation may have an influence on the evolutionary origin of mate discrimination. Our phylogeographical approach clarifies the ancestral relationships of several populations from the South Pacific that show particularly strong mate discrimination and suggests that they may be in the early stages of speciation. Furthermore, both the genetic and behavioral results cast doubt on the status of D. pallidosa as a good species. |
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Keywords: | Drosophila ananassae Drosophila pallidosa mate discrimination prezygotic isolation reproductive isolation speciation |
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