Imperial College London
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ProfessorVincentSavolainen

Faculty of Natural Sciences, Department of Life Sciences (Silwood Park)

Professor of Organismic Biology
 
 
 
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Contact

 

v.savolainen CV

 
 
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Assistant

 

Ms Elisabeth Ahlstrom +44 (0)20 7594 2207

 
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Location

 

N.1-17MunroSilwood Park

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Summary

 

Publications

Citation

BibTex format

@article{Osborne:2019:molbev/msz166,
author = {Osborne, OG and Ciezarek, A and Wilson, T and Crayn, D and Hutton, I and Baker, WJ and Turnbull, CGN and Savolainen, V},
doi = {molbev/msz166},
journal = {Molecular Biology and Evolution},
pages = {2682--2697},
title = {Speciation in Howea palms occurred in sympatry, was preceded by ancestral admixture, and was associated with edaphic and phenological adaptation},
url = {http://dx.doi.org/10.1093/molbev/msz166},
volume = {36},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Howea palms are viewed as one of the most clear-cut cases of speciation in sympatry. The sister species H. belmoreana and H. forsteriana are endemic to the oceanic Lord Howe Island, Australia, where they have overlapping distributions and are reproductively isolated mainly by flowering time differences. However, the potential role of introgression from Australian mainland relatives had not previously been investigated, a process that has recently put other examples of sympatric speciation into question. Furthermore, the drivers of flowering time-based reproductive isolation remain unclear. We sequenced an RNA-seq dataset that comprehensively sampled Howea and their closest mainland relatives (Linospadix, Laccospadix), and collected detailed soil chemistry data on Lord Howe Island to evaluate whether secondary gene flow had taken place and to examine the role of soil preference in speciation. D-statistics analyses strongly support a scenario whereby ancestral Howea hybridised frequently with its mainland relatives, but this only occurred prior to speciation. Expression analysis, population genetic and phylogenetic tests of selection, identified several flowering time genes with evidence of adaptive divergence between the Howea species. We found expression plasticity in flowering time genes in response to soil chemistry as well as adaptive expression and sequence divergence in genes pleiotropically linked to soil adaptation and flowering time. Ancestral hybridisation may have provided the genetic diversity that promoted their subsequent adaptive divergence and speciation, a process that may be common for rapid ecological speciation.
AU  - Osborne,OG
AU  - Ciezarek,A
AU  - Wilson,T
AU  - Crayn,D
AU  - Hutton,I
AU  - Baker,WJ
AU  - Turnbull,CGN
AU  - Savolainen,V
DO  - molbev/msz166
EP  - 2697
PY  - 2019///
SN  - 1537-1719
SP  - 2682
TI  - Speciation in Howea palms occurred in sympatry, was preceded by ancestral admixture, and was associated with edaphic and phenological adaptation
T2  - Molecular Biology and Evolution
UR  - http://dx.doi.org/10.1093/molbev/msz166
UR  - https://academic.oup.com/mbe/article/36/12/2682/5535536
UR  - http://hdl.handle.net/10044/1/71220
VL  - 36
ER  -
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