期刊
AMERICAN NATURALIST
卷 186, 期 5, 页码 675-681出版社
UNIV CHICAGO PRESS
DOI: 10.1086/683172
关键词
cline; computer simulation; Eyprepocnemis plorans; near-neutral model; parasitic model
资金
- Ramon y Cajal Fellowship from the Spanish Ministerio de Ciencia e Innovacion
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 analye 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 exis-tence of B chromosome drive through females and selection against individuals with a high number of B chromosomes.
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