Genetic constraints predict evolutionary divergence in Dalechampia blossoms

Geir H. Bolstad, Thomas F. Hansen, Christophe Pelabon, Mohsen Falahati-Anbaran, Rocio Perez-Barrales, Scott Armbruster

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Abstract

If genetic constraints are important, then rates and direction of evolution should be related to trait evolvability. Here we use recently developed measures of evolvability to test the genetic constraint hypothesis with quantitative genetic data on floral morphology from the Neotropical vine Dalechampia scandens (Euphorbiaceae). These measures were compared against rates of evolution and patterns of divergence among 24 populations in two species in the D. scandens species complex. We found clear evidence for genetic constraints, particularly among traits that were tightly phenotypically integrated. This relationship between evolvability and evolutionary divergence is puzzling, because the estimated evolvabilities seem too large to constitute real constraints. We suggest that this paradox can be explained by a combination of weak stabilizing selection around moving adaptive optima and small realized evolvabilities relative to the observed additive genetic variance.
Original languageEnglish
Article number20130255
Number of pages16
JournalPhilosophical Transactions of the Royal Society B
Volume369
Issue number1649
Early online date7 Jul 2014
DOIs
Publication statusPublished - 19 Aug 2014

Keywords

  • evolutionary rate
  • G-matrix
  • integration
  • macroevolution
  • power relationship

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