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Author (up) Fricke, C.; Andersson, C.; Arnqvist, G. openurl 
  Title Natural selection hampers divergence of reproductive traits in a seed beetle Type Journal Article
  Year 2010 Publication Journal of Evolutionary Biology Abbreviated Journal J. Evol. Biol.  
  Volume 23 Issue Pages 1857-1867  
  Keywords artificial selection; Bruchidae; Callosobruchus maculatus; divergent adaptation; ecological speciation; genetic constraints; insect-host plant association; multivariate selection; postmating sexual selection; sperm competition.  
  Abstract Speciation is thought to often result from indirect selection for reproductive isolation. This will occur when reproductive traits that cause reproductive isolation evolve (i) as a by-product of natural selection on traits with which they are genetically correlated or (ii) as an indirect result of diversifying sexual selection. Here, we use experimental evolution to study the degree of divergent evolution of reproductive traits by manipulating the intensity of natural and sexual selection in replicated selection lines of seed beetles. Following 40 generations of selection, we assayed the degree of divergent evolution of reproductive traits between replicate selection lines experiencing the same selection regime. The evolution of reproductive traits was significantly divergent across selection lines within treatments. The evolution of reproductive traits was both slower and, more importantly, significantly less divergent among lines experiencing stronger directional natural selection. This suggests that reproductive traits did not evolve as an indirect by-product of adaptation. We discuss several ways in which natural selection may hamper divergent evolution among allopatric populations.  
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  Call Number GSC @ jmook @ Serial 63  
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