Premium
Late Pleistocene range expansion of North American topminnows accompanied by admixture and introgression
Author(s) -
Duvernell David D.,
Westhafer Eric,
Schaefer Jacob F.
Publication year - 2019
Publication title -
journal of biogeography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 158
eISSN - 1365-2699
pISSN - 0305-0270
DOI - 10.1111/jbi.13597
Subject(s) - introgression , phylogeography , biology , fundulus , range (aeronautics) , ecology , population , genetic structure , sympatry , geography , zoology , sympatric speciation , genetic variation , fishery , phylogenetic tree , genetics , materials science , demography , sociology , fish <actinopterygii> , gene , composite material
Abstract Aim We used genome‐scale sampling to assess the phylogeography of a group of topminnows in the Fundulus notatus species complex. Two of the species have undergone extensive range expansions resulting in broadly overlapping distributions, and sympatry within drainages has provided opportunities for hybridization and introgression. We assessed the timing and pattern of range expansion in the context of late Pleistocene–Holocene drainage events and evaluated the evidence for introgressive hybridization between species. Location Central and southern United States including drainages of the Gulf of Mexico Coastal Plain and portions of the Mississippi River drainage in and around the Central Highlands. Taxon Topminnows, Genus Fundulus , subgenus Zygonectes — Fundulus notatus, Fundulus olivaceus, Fundulus euryzonus . Methods We sampled members of the F. notatus species complex throughout their respective ranges, including numerous drainage systems where species co‐occur. We collected genome‐wide single nucleotide polymorphisms ( SNP s) using the genotype‐by‐sequencing ( GBS ) method and subjected data to population genetic analyses to infer the population histories of both species, including explicit tests for admixture and introgression. The methods employed included STRUCTURE , principal coordinates analysis, TreeMix and approximate Bayesian computation. Results Genetic data are presented for 749 individuals sampled from 14 F. notatus , 20 F. olivaceus and 2 F. euryzonus populations. Members of the species complex differed in phylogeographic structure, with F. notatus exhibiting geographic clusters corresponding to Pleistocene coastal drainages and F. olivaceus comparatively lacking in phylogeographic structure. Evidence for interspecific introgression varied by drainage. Main conclusions Populations of F. notatus and F. olivaceus exhibited contrasting patterns of lineage diversity among coastal drainages, indicating interspecific differences in their Pleistocene southern refugia. Phylogeographic patterns in both species indicated that range expansions into the northern limits of contemporary distributions coincided with and continued subsequent to the Last Glacial Maximum. There was evidence of introgression between species in some, but not all drainages where the species co‐occur, in a pattern that is correlated with previous estimates of hybridization rates.