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The cost of reinforcement: selection on flower color in allopatric populations of Phlox drummondii.

Publication ,  Journal Article
Hopkins, R; Rausher, MD
Published in: The American naturalist
May 2014

Reinforcement is the process by which increased reproductive isolation between incipient species evolves due to selection against maladaptive hybrids or costly hybrid mating. Reinforcement is predicted to create a pattern of greater prezygotic reproductive isolation in regions where the two species co-occur, sympatry, than in allopatry. Although most research on reinforcement focuses on understanding the evolutionary forces acting in sympatry, here we consider what prevents the alleles conferring greater reproductive isolation from spreading into allopatry. We investigate flower color divergence in the wildflower Phlox drummondii, which is caused by reinforcement in the regions sympatric with its congener Phlox cuspidata. Specifically, we performed common garden field experiments and pollinator observations to estimate selection acting on flower color variation in allopatry. We combine our estimates of maternal and paternal fitness using simulations and predict how flower color alleles migrating from sympatry will evolve in allopatry. Our results suggest that strong pollinator preference for the ancestral flower color in allopatry can maintain divergence between allopatric and sympatric populations.

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Published In

The American naturalist

DOI

EISSN

1537-5323

ISSN

0003-0147

Publication Date

May 2014

Volume

183

Issue

5

Start / End Page

693 / 710

Related Subject Headings

  • Sympatry
  • Selection, Genetic
  • Reproductive Isolation
  • Pollination
  • Magnoliopsida
  • Genetic Fitness
  • Flowers
  • Fertility
  • Ecology
  • Color
 

Citation

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Hopkins, R., & Rausher, M. D. (2014). The cost of reinforcement: selection on flower color in allopatric populations of Phlox drummondii. The American Naturalist, 183(5), 693–710. https://doi.org/10.1086/675495
Hopkins, Robin, and Mark D. Rausher. “The cost of reinforcement: selection on flower color in allopatric populations of Phlox drummondii.The American Naturalist 183, no. 5 (May 2014): 693–710. https://doi.org/10.1086/675495.
Hopkins R, Rausher MD. The cost of reinforcement: selection on flower color in allopatric populations of Phlox drummondii. The American naturalist. 2014 May;183(5):693–710.
Hopkins, Robin, and Mark D. Rausher. “The cost of reinforcement: selection on flower color in allopatric populations of Phlox drummondii.The American Naturalist, vol. 183, no. 5, May 2014, pp. 693–710. Epmc, doi:10.1086/675495.
Hopkins R, Rausher MD. The cost of reinforcement: selection on flower color in allopatric populations of Phlox drummondii. The American naturalist. 2014 May;183(5):693–710.
Journal cover image

Published In

The American naturalist

DOI

EISSN

1537-5323

ISSN

0003-0147

Publication Date

May 2014

Volume

183

Issue

5

Start / End Page

693 / 710

Related Subject Headings

  • Sympatry
  • Selection, Genetic
  • Reproductive Isolation
  • Pollination
  • Magnoliopsida
  • Genetic Fitness
  • Flowers
  • Fertility
  • Ecology
  • Color