Pollinator-mediated selection on flower color allele drives reinforcement.

Published

Journal Article

Reinforcement is the process by which reduced hybrid fitness generates selection favoring the evolution of stronger prezygotic reproductive barriers between emerging species. Using common-garden field experiments, we quantified the strength of reinforcing selection in nature by demonstrating strong selection favoring an allele conferring increased pigment intensity in the plant Phlox drummondii in areas of sympatry with the closely related species Phlox cuspidata. Incomplete hybrid sterility between the two species generates selection for traits that decrease interspecies hybridization. In contrast, selection on this locus is undetectable in the absence of P. cuspidata. We demonstrate that reinforcing selection is generated by nonrandom pollinator movement, in which pollinators move less frequently between intensely pigmented P. drummondii and P. cuspidata than between lightly pigmented P. drummondii and P. cuspidata.

Full Text

Duke Authors

Cited Authors

  • Hopkins, R; Rausher, MD

Published Date

  • March 2012

Published In

Volume / Issue

  • 335 / 6072

Start / End Page

  • 1090 - 1092

PubMed ID

  • 22300852

Pubmed Central ID

  • 22300852

Electronic International Standard Serial Number (EISSN)

  • 1095-9203

International Standard Serial Number (ISSN)

  • 0036-8075

Digital Object Identifier (DOI)

  • 10.1126/science.1215198

Language

  • eng