Postglacial range expansion of high-elevation plants is restricted by dispersal ability and habitat specialization
Carnicero, Pau (University of Innsbruck)
Wessely, Johannes (University of Vienna)
Moser, Dietmar (University of Vienna)
Font i Segura, Xavier (Universitat de Barcelona. Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals)
Dullinger, Stefan (University of Vienna)
Schönswetter, Peter (University of Innsbruck)

Data:	2022
Resum:	Aim Species' ecological traits influence their spatial genetic patterns. Bedrock preference strongly shapes the phylogeography of alpine plants, but its interactions with other ecological traits have rarely been disentangled. Here, we explore whether dispersal ability and degree of habitat specialization account for divergent postglacial expansion patterns of high-elevation plants in spite of similar bedrock preference. Location The Pyrenees, southwestern Europe. Taxon Cirsium glabrum (Asteraceae), Salix pyrenaica (Salicaceae) and Silene borderei (Caryophyllaceae). Methods Phylogenetic, genetic structure and demographic modelling analyses based on restriction-site-associated DNA sequencing (RADseq) data from a range-wide populational sampling were conducted. Occurrence data and environmental variables were used to construct species distribution models, which were projected under current and Last Glacial Maximum conditions, and were combined with RADseq data to reconstruct the postglacial history of the study species. The degree of habitat specialization of each species was estimated based on the plant communities within which they occur, and their climatic niche breadth. Results Salix pyrenaica, which occupies a broad range of habitats, shows a high level of range filling, a blurred genetic structure and an admixture cline between the two main genetic groups, congruent with rapid postglacial expansion. The microsite specialists C. glabrum and S. borderei exhibit a strong genetic structure and low levels of range filling, indicative of slow postglacial expansion. The good disperser C. glabrum shows higher levels of admixture between genetic groups and weaker population differentiation than the poor disperser S. borderei. Main Conclusions Factors other than bedrock preference have a strong impact on the postglacial range dynamics of high-elevation species. Habitat specialization plays an important role, allowing species occupying a broad range of habitats to more rapidly expand their ranges after environmental change. The effect of dispersal ability is lower than expected for the study species.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Pyrenees ; RADseq ; Bedrock ; Comparative phylogeography ; Genetic structure ; Species distribution models
Publicat a:	Journal of biogeography, Vol. 49, Issue 10 (October 2022) , p. 1739-1752, ISSN 1365-2699

DOI: 10.1111/jbi.14390
PMID: 36245965

14 p, 6.3 MB

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