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Introgressive hybridization between two species of waterstriders (Hemiptera: Gerridae: Limnoporus ): geographical structure and temporal change of a hybrid zone
Author(s) -
Klingenberg,
Spence,
Christen K. Mirth
Publication year - 2000
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 - 10.1046/j.1420-9101.2000.00224.x
Subject(s) - introgression , biology , range (aeronautics) , gerridae , hybrid zone , ordination , principal component analysis , hemiptera , evolutionary biology , ecology , zoology , gene flow , genetic variation , genetics , materials science , artificial intelligence , gene , computer science , composite material
Where the distribution ranges of the waterstriders Limnoporus notabilis and L. dissortis meet in western Canada, extensive hybridization and introgression occurs. Multivariate ordination analyses of genetic and morphometric data by principal component analysis revealed that a single axis separating the two parent species could account for nearly all the variation in both data sets. Maps of principal component scores for both data sets revealed geographical patterns of variation reflecting specific topographic features in the region. Comparisons of morphometric data from some of the samples collected in the 1980s and from the same sites revisited in the 1990s revealed substantial changes. An ‘island’ of dissortis ‐like populations inside the range of L. notabilis in interior British Columbia expanded, and a marked local protrusion of notabilis ‐like phenotypes into the range of L. dissortis on the east slope of the Rocky Mountains diminished during the decade between collections. We conclude that introgressive hybridization between these two species of waterstriders is a spatially complex and highly dynamic process.