Limited phenological and pollinator-mediated isolation among selfing and outcrossing Arabidopsis lyrata populations

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2020
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Bond, Lindsay
Dorken, Marcel E.
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Proceedings of the Royal Society of London, Series B : Biological Sciences ; 287 (2020), 1939. - 20202323. - Royal Society of London. - ISSN 0962-8452. - eISSN 1471-2954
Abstract
Transitions from outcrossing to selfing have been a frequent evolutionary shift in plants and clearly play a role in species divergence. However, many questions remain about the initial mechanistic basis of reproductive isolation during the evolution of selfing. For instance, how important are pre-zygotic pre-pollination mechanisms (e.g. changes in phenology and pollinator visitation) in maintaining reproductive isolation between newly arisen selfing populations and their outcrossing ancestors? To test whether changes in phenology and pollinator visitation isolate selfing populations of Arabidopsis lyrata from outcrossing populations, we conducted a common garden experiment with plants from selfing and outcrossing populations as well as their between-population hybrids. Specifically, we asked whether there was isolation between outcrossing and selfing plants and their between-population hybrids through differences in (1) the timing or intensity of flowering; and/or (2) pollinator visitation. We found that phenology largely overlapped between plants from outcrossing and selfing populations. There were also no differences in pollinator preference related to mating system. Additionally, pollinators preferred to visit flowers on the same plant rather than exploring nearby plants, creating a large opportunity for self-fertilization. Overall, this suggests that pre-zygotic pre-pollination mechanisms do not strongly reproductively isolate plants from selfing and outcrossing populations of Arabidopsis lyrata.
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ISO 690GORMAN, Courtney, Lindsay BOND, Mark VAN KLEUNEN, Marcel E. DORKEN, Marc STIFT, 2020. Limited phenological and pollinator-mediated isolation among selfing and outcrossing Arabidopsis lyrata populations. In: Proceedings of the Royal Society of London, Series B : Biological Sciences. Royal Society of London. 287(1939), 20202323. ISSN 0962-8452. eISSN 1471-2954. Available under: doi: 10.1098/rspb.2020.2323
BibTex
@article{Gorman2020-11-25Limit-52252,
  year={2020},
  doi={10.1098/rspb.2020.2323},
  title={Limited phenological and pollinator-mediated isolation among selfing and outcrossing Arabidopsis lyrata populations},
  number={1939},
  volume={287},
  issn={0962-8452},
  journal={Proceedings of the Royal Society of London, Series B : Biological Sciences},
  author={Gorman, Courtney and Bond, Lindsay and van Kleunen, Mark and Dorken, Marcel E. and Stift, Marc},
  note={Article Number: 20202323}
}
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