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Maintenance of species boundaries despite ongoing gene flow in ragworts

Maintenance of species boundaries despite ongoing gene flow in ragworts
Maintenance of species boundaries despite ongoing gene flow in ragworts
The role of hybridization between diversifying species has been the focus of a huge amount of recent evolutionary research. While gene flow can prevent speciation or initiate species collapse, it can also generate new hybrid species. Similarly, while adaptive divergence can be wiped out by gene flow, new adaptive variation can be introduced via introgression. The relative frequency of these outcomes, and indeed the frequency of hybridization and introgression in general are largely unknown. One group of closely-related species with several documented cases of hybridization is the Mediterranean ragwort (genus: Senecio) species-complex. Examples of both polyploid and homoploid hybrid speciation are known in the clade, although their evolutionary relationships and the general frequency of introgressive hybridization among them remain unknown. Using a whole genome gene-space dataset comprising eight Senecio species we fully resolve the phylogeny of these species for the first time despite phylogenetic incongruence across the genome. Using a D-statistic approach, we demonstrate previously unknown cases of introgressive hybridization between multiple pairs of taxa across the species tree. This is an important step in establishing these species as a study system for diversification with gene flow, and suggests that introgressive hybridization may be a widespread and important process in plant evolution.
speciation with gene flow, hybridization, phylogenetic incongruence, clade diversification, introgression
1759-6653
1-10
Osborne, Owen
e21a24bb-afdc-4893-8cb6-b87b46a2ac23
Chapman, Mark
8bac4a92-bfa7-4c3c-af29-9af852ef6383
Nevado, Bruno
d3d265c6-dee2-4829-8d9c-7cede02575b8
Filatov, Dmitry
6915d6cb-16dd-44dd-b12e-e9a91b5dd199
Osborne, Owen
e21a24bb-afdc-4893-8cb6-b87b46a2ac23
Chapman, Mark
8bac4a92-bfa7-4c3c-af29-9af852ef6383
Nevado, Bruno
d3d265c6-dee2-4829-8d9c-7cede02575b8
Filatov, Dmitry
6915d6cb-16dd-44dd-b12e-e9a91b5dd199

Osborne, Owen, Chapman, Mark, Nevado, Bruno and Filatov, Dmitry (2016) Maintenance of species boundaries despite ongoing gene flow in ragworts. Genome Biology and Evolution, 8 (4), 1-10. (doi:10.1093/gbe/evw053). (PMID:26979797)

Record type: Article

Abstract

The role of hybridization between diversifying species has been the focus of a huge amount of recent evolutionary research. While gene flow can prevent speciation or initiate species collapse, it can also generate new hybrid species. Similarly, while adaptive divergence can be wiped out by gene flow, new adaptive variation can be introduced via introgression. The relative frequency of these outcomes, and indeed the frequency of hybridization and introgression in general are largely unknown. One group of closely-related species with several documented cases of hybridization is the Mediterranean ragwort (genus: Senecio) species-complex. Examples of both polyploid and homoploid hybrid speciation are known in the clade, although their evolutionary relationships and the general frequency of introgressive hybridization among them remain unknown. Using a whole genome gene-space dataset comprising eight Senecio species we fully resolve the phylogeny of these species for the first time despite phylogenetic incongruence across the genome. Using a D-statistic approach, we demonstrate previously unknown cases of introgressive hybridization between multiple pairs of taxa across the species tree. This is an important step in establishing these species as a study system for diversification with gene flow, and suggests that introgressive hybridization may be a widespread and important process in plant evolution.

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More information

Accepted/In Press date: 7 March 2016
e-pub ahead of print date: 14 March 2016
Keywords: speciation with gene flow, hybridization, phylogenetic incongruence, clade diversification, introgression
Organisations: Environmental

Identifiers

Local EPrints ID: 396185
URI: http://eprints.soton.ac.uk/id/eprint/396185
ISSN: 1759-6653
PURE UUID: 73f5ad27-a191-40cc-b49f-2c5f707b26d9
ORCID for Mark Chapman: ORCID iD orcid.org/0000-0002-7151-723X

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Date deposited: 06 Jun 2016 08:57
Last modified: 28 Apr 2022 02:08

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Contributors

Author: Owen Osborne
Author: Mark Chapman ORCID iD
Author: Bruno Nevado
Author: Dmitry Filatov

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