Genomic evidence for the parallel evolution of coastal forms in the Senecio lautus complex

Roda, Federico, Ambrose, Luke, Walter, Gregory M., Liu, Huanle L., Schaul, Andrea, Lowe, Andrew, Pelser, Pieter B., Prentis, Peter, Rieseberg, Loren H. and Ortiz-Barrientos, Daniel (2013) Genomic evidence for the parallel evolution of coastal forms in the Senecio lautus complex. Molecular Ecology, 22 11: 2941-2952. doi:10.1111/mec.12311


Author Roda, Federico
Ambrose, Luke
Walter, Gregory M.
Liu, Huanle L.
Schaul, Andrea
Lowe, Andrew
Pelser, Pieter B.
Prentis, Peter
Rieseberg, Loren H.
Ortiz-Barrientos, Daniel
Title Genomic evidence for the parallel evolution of coastal forms in the Senecio lautus complex
Formatted title
Genomic evidence for the parallel evolution of coastal forms in the Senecio lautus complex
Journal name Molecular Ecology   Check publisher's open access policy
ISSN 0962-1083
1365-294X
Publication date 2013-06
Sub-type Article (original research)
DOI 10.1111/mec.12311
Volume 22
Issue 11
Start page 2941
End page 2952
Total pages 12
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell
Collection year 2014
Language eng
Formatted abstract
Instances of parallel ecotypic divergence where adaptation to similar conditions repeatedly cause similar phenotypic changes in closely related organisms are useful for studying the role of ecological selection in speciation. Here we used a combination of traditional and next generation genotyping techniques to test for the parallel divergence of plants from the Senecio lautus complex, a phenotypically variable groundsel that has adapted to disparate environments in the South Pacific. Phylogenetic analysis of a broad selection of Senecio species showed that members of the S. lautus complex form a distinct lineage that has diversified recently in Australasia. An inspection of thousands of polymorphisms in the genome of 27 natural populations from the S. lautus complex in Australia revealed a signal of strong genetic structure independent of habitat and phenotype. Additionally, genetic differentiation between populations was correlated with the geographical distance separating them, and the genetic diversity of populations strongly depended on geographical location. Importantly, coastal forms appeared in several independent phylogenetic clades, a pattern that is consistent with the parallel evolution of these forms. Analyses of the patterns of genomic differentiation between populations further revealed that adjacent populations displayed greater genomic heterogeneity than allopatric populations and are differentiated according to variation in soil composition. These results are consistent with a process of parallel ecotypic divergence in face of gene flow.
Keyword Adaptation
Parallel evolution
RAD genotyping
Senecio
Speciation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
 
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