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Locally asymmetric introgressions between subspecies suggest circular range expansion at the Antirrhinum majus global scale
Author(s) -
KHIMOUN A.,
BURRUS M.,
ANDALO C.,
LIU Z.L.,
VICÉDOCAZETTES C.,
THÉBAUD C.,
PUJOL B.
Publication year - 2011
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1111/j.1420-9101.2011.02276.x
Subject(s) - subspecies , antirrhinum majus , introgression , biology , range (aeronautics) , geographical distance , hybrid zone , ecology , evolutionary biology , genetic variation , population , biochemistry , gene flow , materials science , demography , sociology , composite material , gene
Assessing processes of geographic expansion in contact zones is a crucial step towards an accurate prediction of the evolution of species genetic diversity. The geographic distribution of cytonuclear discordance often reflects genetic introgression patterns across a species geographic range. Antirrhinum majus pseudomajus and A. m. striatum are two interfertile subspecies that occupy nonoverlapping areas but enter in contact in many locations at the margin of their geographic distribution. We found that genetic introgression between both subspecies was asymmetric at the local scale and geographically oriented in opposite directions at both ends of their contact zone perimeter in the Pyrenees. Our results suggest that the geographic expansion of A. majus subspecies was circular around the perimeter of their contact zone and pinpoint the need to integrate different spatial scales to unravel complex patterns of species geographic expansion.