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Independent homoploid hybrid speciation events in the Macaronesian endemic genus Argyranthemum

Independent homoploid hybrid speciation events in the Macaronesian endemic genus Argyranthemum
Independent homoploid hybrid speciation events in the Macaronesian endemic genus Argyranthemum

Well-characterized examples of homoploid hybrid speciation (HHS) are rare in nature, yet they offer the potential to study a number of evolutionary processes. In this study, we investigate putative homoploid hybrid species in the genus Argyranthemum (Asteraceae), a group of plants endemic to the Macaronesian archipelagos of the North Atlantic Ocean. We specifically address a number of knowledge gaps surrounding the origin(s) of A. sundingii and A. lemsii, which are thought to be derived from the same parental cross. Comparisons of leaf morphology suggest that A. sundingii and A. lemsii are distinct from their parental progenitors and distinguishable from each other based on leaf area. Ecological niche modelling (ENM) demonstrated that the homoploid hybrid species occupy novel habitats that are intermediate relative to the parental species. Nuclear simple sequence repeat markers (SSRs) and single nucleotide polymorphism (SNP) data indicate that the homoploid hybrid species are distinct from the parental taxa, while population-level sampling of chloroplast SSRs and approximate Bayesian computation show that A. sundingii and A. lemsii are independently derived from the same parental cross. As such, Argyranthemum represents an example of independent homoploid hybrid speciation events with evidence of divergence in leaf morphology and adaptation to novel intermediate habitats. On oceanic islands, which are often typified by steep ecological gradients and inhabited by recently derived species with weak reproductive barriers, multiple HHS events from the same parental cross are not only possible but also likely to have played a more important role in oceanic island radiations than we currently think.

Argyranthemum, hybridization, Macaronesia, speciation
0962-1083
4856-4874
White, Oliver W.
1d575ea4-82e2-47a0-83aa-12a34e44f314
Reyes-Betancort, Alfredo
999ff0d8-7929-4f8c-9834-35a27378b6df
Chapman, Mark A.
8bac4a92-bfa7-4c3c-af29-9af852ef6383
Carine, Mark A.
eeaed5aa-bc4b-43ec-a667-b6c45e3217ed
White, Oliver W.
1d575ea4-82e2-47a0-83aa-12a34e44f314
Reyes-Betancort, Alfredo
999ff0d8-7929-4f8c-9834-35a27378b6df
Chapman, Mark A.
8bac4a92-bfa7-4c3c-af29-9af852ef6383
Carine, Mark A.
eeaed5aa-bc4b-43ec-a667-b6c45e3217ed

White, Oliver W., Reyes-Betancort, Alfredo, Chapman, Mark A. and Carine, Mark A. (2018) Independent homoploid hybrid speciation events in the Macaronesian endemic genus Argyranthemum. Molecular Ecology, 27 (23), 4856-4874. (doi:10.1111/mec.14889).

Record type: Article

Abstract

Well-characterized examples of homoploid hybrid speciation (HHS) are rare in nature, yet they offer the potential to study a number of evolutionary processes. In this study, we investigate putative homoploid hybrid species in the genus Argyranthemum (Asteraceae), a group of plants endemic to the Macaronesian archipelagos of the North Atlantic Ocean. We specifically address a number of knowledge gaps surrounding the origin(s) of A. sundingii and A. lemsii, which are thought to be derived from the same parental cross. Comparisons of leaf morphology suggest that A. sundingii and A. lemsii are distinct from their parental progenitors and distinguishable from each other based on leaf area. Ecological niche modelling (ENM) demonstrated that the homoploid hybrid species occupy novel habitats that are intermediate relative to the parental species. Nuclear simple sequence repeat markers (SSRs) and single nucleotide polymorphism (SNP) data indicate that the homoploid hybrid species are distinct from the parental taxa, while population-level sampling of chloroplast SSRs and approximate Bayesian computation show that A. sundingii and A. lemsii are independently derived from the same parental cross. As such, Argyranthemum represents an example of independent homoploid hybrid speciation events with evidence of divergence in leaf morphology and adaptation to novel intermediate habitats. On oceanic islands, which are often typified by steep ecological gradients and inhabited by recently derived species with weak reproductive barriers, multiple HHS events from the same parental cross are not only possible but also likely to have played a more important role in oceanic island radiations than we currently think.

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Accepted/In Press date: 26 September 2018
e-pub ahead of print date: 3 October 2018
Published date: December 2018
Keywords: Argyranthemum, hybridization, Macaronesia, speciation

Identifiers

Local EPrints ID: 426815
URI: http://eprints.soton.ac.uk/id/eprint/426815
ISSN: 0962-1083
PURE UUID: 59743c7d-28cd-4ff6-be0c-dfab2e98a327
ORCID for Mark A. Chapman: ORCID iD orcid.org/0000-0002-7151-723X

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Date deposited: 12 Dec 2018 17:32
Last modified: 26 Nov 2021 06:59

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Contributors

Author: Oliver W. White
Author: Alfredo Reyes-Betancort
Author: Mark A. Chapman ORCID iD
Author: Mark A. Carine

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