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Geographic and phylogenetic evidence for dispersed nuclear introgression in a daphniid with sexual propagules
Author(s) -
TAYLOR DEREK J.,
SPRENGER HEATHER L.,
ISHIDA SEIJI
Publication year - 2005
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/j.1365-294x.2005.02415.x
Subject(s) - biology , introgression , propagule , daphnia pulex , biological dispersal , daphnia , reproductive isolation , phylogenetic tree , gene flow , internal transcribed spacer , plant evolution , evolutionary biology , ecology , lineage (genetic) , zoology , genetics , genetic variation , population , gene , genome , demography , crustacean , sociology
The role of among‐species gene flow in eukaryotic evolution remains controversial. Putative hybrid lineages are common in water fleas, but their ecological success is often associated with polyploidy and the production of asexual propagules. Advanced hybrid lineages with sexual propagules are expected to be geographically restricted because their successful dispersal is contingent on overcoming fertility complications, assimilation by parent taxa, and competition with parent taxa. Here we provide evidence that a diploid lineage of Daphnia has been formed by introgression between distantly related species and attained a broad distribution (Nearctic) despite its requirement for sexual propagules. The evidence is based on geographical discordance, phylogenetic discordance, recombinant genotypes and additive genotypes of the nuclear internal transcribed spacer regions (ITS) and mitochondrial DNA. Additive genotypes also provided evidence of hybridization between introduced European Daphnia and North American Daphnia . We argue that the unique biology of Holarctic lacustrine water fleas and the spatial separation of lineages during Pleistocene glaciation have promoted hybridization and its evolutionary consequences.