Isolation and gene flow in a speciation continuum in newts

Maciej Pabijan*, Piotr Zieliński, Katarzyna Dudek, Michał Stuglik, Wiesław Babik

*Corresponding author for this work

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Because reproductive isolation often evolves gradually, differentiating lineages may retain the potential for genetic exchange for prolonged periods, providing an opportunity to quantify and to understand the fundamental role of gene flow during speciation. Here we delimit evolutionary lineages, reconstruct the phylogeny and infer gene flow in newts of the Lissotriton vulgaris species complex based on 74 nuclear markers sampled from 127 localities. We demonstrate that distinct lineages along the speciation continuum in newts exchange nontrivial amounts of genes, affecting their evolutionary trajectories. By integrating a wide array of methods, we delimit nine evolutionary lineages and show that two principal factors have driven their genetic differentiation: time since the last common ancestor determining levels of shared ancestral polymorphism, and shifts in geographic distributions determining the extent of secondary contact. Post-divergence gene flow, indicative of evolutionary non-independence, has been most extensive in Central Europe, while four southern European lineages have acquired the population-genetic hallmarks of independent species (L. graecus, L. kosswigi, L. lantzi, L. schmidtleri). We obtained strong statistical support for widespread mtDNA introgression following secondary contact, previously suggested by discordance between mtDNA phylogeny and morphology. Our study reveals long-term evolutionary persistence of evolutionary lineages that may periodically exchange genes with one another: although some of these lineages may become extinct or fuse, others will acquire complete reproductive isolation and will carry signatures of this complex history in their genomes.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalMolecular Phylogenetics and Evolution
Volume116
Early online date7 Aug 2017
DOIs
Publication statusPrint publication - 1 Nov 2017

Fingerprint

Salamandridae
Gene Flow
salamanders and newts
Reproductive Isolation
gene flow
secondary contact
reproductive isolation
Phylogeny
Mitochondrial DNA
phylogeny
mitochondrial DNA
gene
Population Genetics
introgression
common ancestry
species complex
Central European region
genetic differentiation
population genetics
Genes

Keywords

  • Amphibian
  • Delimitation
  • Hybridization
  • Reticulate evolution
  • Taxonomy

Cite this

Pabijan, Maciej ; Zieliński, Piotr ; Dudek, Katarzyna ; Stuglik, Michał ; Babik, Wiesław. / Isolation and gene flow in a speciation continuum in newts. In: Molecular Phylogenetics and Evolution. 2017 ; Vol. 116. pp. 1-12.
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Isolation and gene flow in a speciation continuum in newts. / Pabijan, Maciej; Zieliński, Piotr; Dudek, Katarzyna; Stuglik, Michał; Babik, Wiesław.

In: Molecular Phylogenetics and Evolution, Vol. 116, 01.11.2017, p. 1-12.

Research output: Contribution to journalArticle

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