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Selection for character displacement is constrained by the genetic architecture of floral traits in the ivyleaf morning glory.

Publication ,  Journal Article
Smith, RA; Rausher, MD
Published in: Evolution; international journal of organic evolution
November 2008

Evolutionary theory predicts that interactions between species such as resource competition or reproductive interference will generate selection for character displacement where similar species co-occur. However, the rate and direction of character displacement will depend not only on the strength of selection for trait divergence, but also on the amount of genetic variation for selected traits and the nature of genetic correlations between them. To assess the importance of genetic constraints for the evolution of character displacement, we examined the genetic architecture of a suite of floral traits previously shown to be under selection in the annual plant Ipomoea hederacea when this species co-occurs with Ipomoea purpurea. We found that the six floral traits we measured are all positively genetically correlated. We also demonstrate, using new statistical approaches, that the predicted response to selection for four of these six traits is substantially constrained by their genetic correlation structure. Most notably, the response to selection for reduced separation of the tallest and shortest anthers, which reduces the degree of detrimental heterospecific pollen flow, is substantially constrained. Our results suggest that the rate of evolution of reproductive character displacement in I. hederacea is limited by the genetic architecture of floral traits.

Duke Scholars

Published In

Evolution; international journal of organic evolution

DOI

EISSN

1558-5646

ISSN

0014-3820

Publication Date

November 2008

Volume

62

Issue

11

Start / End Page

2829 / 2841

Related Subject Headings

  • Selection, Genetic
  • Plant Leaves
  • Magnoliopsida
  • Genetic Variation
  • Flowers
  • Evolutionary Biology
  • 3104 Evolutionary biology
  • 3103 Ecology
  • 0603 Evolutionary Biology
  • 0602 Ecology
 

Citation

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ICMJE
MLA
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Smith, R. A., & Rausher, M. D. (2008). Selection for character displacement is constrained by the genetic architecture of floral traits in the ivyleaf morning glory. Evolution; International Journal of Organic Evolution, 62(11), 2829–2841. https://doi.org/10.1111/j.1558-5646.2008.00494.x
Smith, Robin Ann, and Mark D. Rausher. “Selection for character displacement is constrained by the genetic architecture of floral traits in the ivyleaf morning glory.Evolution; International Journal of Organic Evolution 62, no. 11 (November 2008): 2829–41. https://doi.org/10.1111/j.1558-5646.2008.00494.x.
Smith RA, Rausher MD. Selection for character displacement is constrained by the genetic architecture of floral traits in the ivyleaf morning glory. Evolution; international journal of organic evolution. 2008 Nov;62(11):2829–41.
Smith, Robin Ann, and Mark D. Rausher. “Selection for character displacement is constrained by the genetic architecture of floral traits in the ivyleaf morning glory.Evolution; International Journal of Organic Evolution, vol. 62, no. 11, Nov. 2008, pp. 2829–41. Epmc, doi:10.1111/j.1558-5646.2008.00494.x.
Smith RA, Rausher MD. Selection for character displacement is constrained by the genetic architecture of floral traits in the ivyleaf morning glory. Evolution; international journal of organic evolution. 2008 Nov;62(11):2829–2841.
Journal cover image

Published In

Evolution; international journal of organic evolution

DOI

EISSN

1558-5646

ISSN

0014-3820

Publication Date

November 2008

Volume

62

Issue

11

Start / End Page

2829 / 2841

Related Subject Headings

  • Selection, Genetic
  • Plant Leaves
  • Magnoliopsida
  • Genetic Variation
  • Flowers
  • Evolutionary Biology
  • 3104 Evolutionary biology
  • 3103 Ecology
  • 0603 Evolutionary Biology
  • 0602 Ecology