Transient microgeographic clines during B chromosome invasion

Juan Pedro M. Camacho, Michael W. Shaw, Josefa Cabrero, Mohammed Bakkali, Mercedes Ru�z-Est�vez, Francisco J. Ru�z-Ruano, Rub�n Mart�n-Bl�zquez, Mar�a Dolores L�pez-Le�n

Research output: Contribution to journalComment/debatepeer-review

8 Scopus citations


The near-neutral model of B chromosome evolution predicts that the invasion of a new population should last some tens of generations, but the details on how it proceeds in real populations are mostly unknown. Trying to fill this gap, we analyze here a natural population of the grasshopper Eyprepocnemis plorans at three time points during the last 35 years. Our results show that B chromosome frequency increased significantly during this period and that a cline observed in 1992 had disappeared in 2012 once B chromosome frequency reached an upper limit at all sites sampled. This indicates that, during B chromosome invasion, transient clines for B chromo-some frequency are formed at the invasion front on a microgeographic scale. Computer simulation experiments showed that the pattern of change observed for genotypic frequencies is consistent with the existence of B chromosome drive through females and selection against individuals with a high number of B chromosomes.

Original languageEnglish (US)
Pages (from-to)675-681
Number of pages7
JournalAmerican Naturalist
Issue number5
StatePublished - Jan 1 2015


  • Cline
  • Computer simulation
  • Eyprepocnemis plorans
  • Nearneutral model
  • Parasitic model


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