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  • Title: Transient Microgeographic Clines during B Chromosome Invasion.
    Author: Camacho JP, Shaw MW, Cabrero J, Bakkali M, Ruíz-Estévez M, Ruíz-Ruano FJ, Martín-Blázquez R, López-León MD.
    Journal: Am Nat; 2015 Nov; 186(5):675-81. PubMed ID: 26655780.
    Abstract:
    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 chromosome 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.
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