Hybrid swarms: catalysts for multiple evolutionary events in Senecio in the British Isles

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dc.contributor.authorLowe, A.
dc.contributor.authorAbbott, R.
dc.date.issued2015
dc.description.abstractBackground: Introgressive hybridisation is an evolutionary catalyst producing novel variants able to explore new ecological niches and evolve as new hybrid taxa. However, the role of ‘hybrid swarms’ – highly variable populations produced following interspecific hybridisation – in generating this evolutionary novelty has been poorly studied. Aims: We examine the alternative origins of tetraploid hybrid derivatives of Senecio vulgaris and S. squalidus, via local polytopic formation or long-distance dispersal from a single perennial hybrid swarm around Cork, Ireland. Methods: Morphometric, isozyme and chloroplast DNA analysis. Results: The Cork hybrid swarm and UK hybrid swarms exhibited a broad range of morphological variation and contained individuals similar to the stable tetraploid hybrid derivatives; S. eboracensis and S. vulgaris var. hibernicus. Chloroplast DNA analysis shows that S. eboracensis did not evolve from the Cork hybrid swarm. However, UK S. vulgaris var. hibernicus populations exhibit a broad range of variation for both chloroplast and isozyme markers, but were not distinguishable from Cork material. Conclusions: Our study confirms that S. eboracensis did not evolve from the Cork hybrid swarm, and while our analyses could not demonstrate this conclusively for S. vulgaris var. hibernicus the ease with which hybrid swarms have been generated in the past makes a polytopic origin for S. vulgaris var. hibernicus the most likely scenario.
dc.description.statementofresponsibilityAndrew J. Lowe, Richard J. Abbott
dc.identifier.citationPlant Ecology and Diversity, 2015; 8(4):449-463
dc.identifier.doi10.1080/17550874.2015.1028113
dc.identifier.issn1755-0874
dc.identifier.issn1755-1668
dc.identifier.orcidLowe, A. [0000-0003-1139-2516]
dc.identifier.urihttp://hdl.handle.net/2440/96381
dc.language.isoen
dc.publisherTaylor & Francis
dc.rights© 2015 The Author(s). Published by Taylor & Francis. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.source.urihttps://doi.org/10.1080/17550874.2015.1028113
dc.subjectevolutionary genetics; hybridisation; hybrid taxa; introgression; polytopic origin; Senecio
dc.titleHybrid swarms: catalysts for multiple evolutionary events in Senecio in the British Isles
dc.typeJournal article
pubs.publication-statusPublished

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