TY - JOUR
T1 - Transient microgeographic clines during B chromosome invasion
AU - Camacho, Juan Pedro M.
AU - Shaw, Michael W.
AU - Cabrero, Josefa
AU - Bakkali, Mohammed
AU - Ru�z-Est�vez, Mercedes
AU - Ru�z-Ruano, Francisco J.
AU - Mart�n-Bl�zquez, Rub�n
AU - L�pez-Le�n, Mar�a Dolores
PY - 2015/1/1
Y1 - 2015/1/1
N2 - 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.
AB - 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.
KW - Cline
KW - Computer simulation
KW - Eyprepocnemis plorans
KW - Nearneutral model
KW - Parasitic model
UR - http://www.scopus.com/inward/record.url?scp=84945323530&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84945323530&partnerID=8YFLogxK
U2 - 10.1086/683172
DO - 10.1086/683172
M3 - Comment/debate
C2 - 26655780
AN - SCOPUS:84945323530
SN - 0003-0147
VL - 186
SP - 675
EP - 681
JO - American Naturalist
JF - American Naturalist
IS - 5
ER -