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Genetic structure in the northern range margins of common ash, Fraxinus excelsior L.

hal.structure.identifierNorsk institutt for bioøkonomi=Norwegian Institute of Bioeconomy Research [NIBIO]
dc.contributor.authorTOLLEFSRUD, Mari Mette
hal.structure.identifierNorsk institutt for bioøkonomi=Norwegian Institute of Bioeconomy Research [NIBIO]
dc.contributor.authorMYKING, Tor
hal.structure.identifierNorsk institutt for bioøkonomi=Norwegian Institute of Bioeconomy Research [NIBIO]
dc.contributor.authorSØNSTEBØ, Jørn Henrik
hal.structure.identifierInstitute of Botany of Nature Research Centre
dc.contributor.authorLYGIS, Vaidotas
hal.structure.identifierNorsk institutt for bioøkonomi=Norwegian Institute of Bioeconomy Research [NIBIO]
dc.contributor.authorHIETALA, Ari Mikko
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierDepartment of Forest Ecology and Genetics
dc.contributor.authorHEUERTZ, Myriam
dc.date.issued2016
dc.identifier.issn1932-6203
dc.description.abstractEnDuring post glacial colonization, loss of genetic diversity due to leading edge effects may be attenuated in forest trees because of their prolonged juvenile phase, allowing many migrants to reach the colonizing front before populations become reproductive. The northern range margins of temperate tree taxa in Europe are particularly suitable to study the genetic processes that follow colonization because they have been little affected by northern refugia. Here we examined how post glacial range dynamics have shaped the genetic structure of common ash (Fraxinus excelsior L.) in its northern range compared to its central range in Europe. We used four chloroplast and six nuclear microsatellites to screen 42 populations (1099 trees), half of which corresponded to newly sampled populations in the northern range and half of which represented reference populations from the central range obtained from previously studies. We found that northern range populations of common ash have the same chloroplast haplotypes as south-eastern European populations, suggesting that colonization of the northern range took place along a single migration route, a result confirmed by the structure at the nuclear microsatellites. Along this route, diversity strongly decreased only in the northern range, concomitantly with increasing population differentiation and complex population substructures, a pattern consistent with a leading edge colonization model. Our study highlights that while diversity is maintained in the central range of common ash due to broad colonizing fronts and high levels of gene flow, it profoundly decreases in the northern range, where colonization was unidirectional and probably involved repeated founder events and population fluctuations. Currently, common ash is threatened by ash dieback, and our results on northern populations will be valuable for developing gene conservation strategies.
dc.language.isoen
dc.publisherPublic Library of Science
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subjectfraxinus excelsior
dc.subjectcolonisation post-glaciaire
dc.subjectrefuge
dc.subject.encommon ash (tree)
dc.title.enGenetic structure in the northern range margins of common ash, Fraxinus excelsior L.
dc.typeArticle de revue
dc.identifier.doi10.1371/journal.pone.0167104
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalPLoS ONE
bordeaux.page1-20
bordeaux.volume11
bordeaux.issue12
bordeaux.peerReviewedoui
hal.identifierhal-01602495
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01602495v1
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