TY - JOUR
T1 - Transitions between phases of genomic differentiation during stick-insect speciation
AU - Riesch, Rudiger
AU - Muschick, Moritz
AU - Lindtke, Dorothea
AU - Villoutreix, Romain
AU - Comeault, Aaron
AU - Farkas, Timothy
AU - Lucek, Kay
AU - Hellen, Elizabeth
AU - Soria-Carrasco, Victor
AU - Dennis, Stuart
AU - de Carvalho, Clarissa
AU - Safran, Rebecca
AU - Sandoval, Cristina
AU - Feder, Jeff
AU - Gries, Regine
AU - Crespi, Bernard
AU - Gries, Gerhard
AU - Gompert, Zach
AU - Nosil, Patrik
PY - 2017/2/17
Y1 - 2017/2/17
N2 - Speciation can involve a transition from a few genetic loci that are resistant to gene flow to genome-wide differentiation. However, only limited data exist concerning this transition and the factors promoting it. Here, we study phases of speciation using data from >100 populations of 11 species of Timema stick insects. Consistent with early phases of genic speciation, adaptive colour-pattern loci reside in localized genetic regions of accentuated differentiation between populations experiencing gene flow. Transitions to genome-wide differentiation are also observed with gene flow, in association with differentiation in polygenic chemical traits affecting mate choice. Thus, intermediate phases of speciation are associated with genome-wide differentiation and mate choice, but not growth of a few genomic islands. We also find a gap in genomic differentiation between sympatric taxa that still exchange genes and those that do not, highlighting the association between differentiation and complete reproductive isolation. Our results suggest that substantial progress towards speciation may involve the alignment of multi-faceted aspects of differentiation.
AB - Speciation can involve a transition from a few genetic loci that are resistant to gene flow to genome-wide differentiation. However, only limited data exist concerning this transition and the factors promoting it. Here, we study phases of speciation using data from >100 populations of 11 species of Timema stick insects. Consistent with early phases of genic speciation, adaptive colour-pattern loci reside in localized genetic regions of accentuated differentiation between populations experiencing gene flow. Transitions to genome-wide differentiation are also observed with gene flow, in association with differentiation in polygenic chemical traits affecting mate choice. Thus, intermediate phases of speciation are associated with genome-wide differentiation and mate choice, but not growth of a few genomic islands. We also find a gap in genomic differentiation between sympatric taxa that still exchange genes and those that do not, highlighting the association between differentiation and complete reproductive isolation. Our results suggest that substantial progress towards speciation may involve the alignment of multi-faceted aspects of differentiation.
KW - ecological speciation
KW - mate choice
KW - reproductive isolation
KW - stick insects
KW - cuticular hydrocarbons
KW - chemical communication
KW - genomics
U2 - 10.1038/s41559-017-0082
DO - 10.1038/s41559-017-0082
M3 - Article
SN - 2397-334X
VL - 1
SP - 1
EP - 13
JO - Nature Ecology & Evolution
JF - Nature Ecology & Evolution
M1 - 0082
ER -