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Genetic structure in Pinus cembra from the Carpathian Mountains inferred from nuclear and chloroplast microsatellites confirms post-glacial range contraction and identifies introduced individuals

Lendvay, Bertalan ; Höhn, Mária ; Brodbeck, Sabine ; Mîndrescu, Marcel ; Gugerli, Felix

In: Tree Genetics & Genomes, 2014, vol. 10, no. 5, p. 1419-1433

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    Titre
    • Genetic structure in Pinus cembra from the Carpathian Mountains inferred from nuclear and chloroplast microsatellites confirms post-glacial range contraction and identifies introduced individuals
    Auteur
    • Lendvay, Bertalan. WSL Swiss Federal Research Institute, Birmensdorf, Switzerland
    • Höhn, Mária. Faculty of Horticultural Science, Corvinus University of Budapest, Budapest, Hungary
    • Brodbeck, Sabine. WSL Swiss Federal Research Institute, Birmensdorf, Switzerland
    • Mîndrescu, Marcel. Department of Geography, University of Suceava, Suceava, Romania
    • Gugerli, Felix. WSL Swiss Federal Research Institute, Birmensdorf, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Tree Genetics & Genomes, 2014, vol. 10, no. 5, p. 1419-1433. Springer Berlin Heidelberg
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325565
    Summary
    Genetic differentiation of scattered populations at neutral loci is characterized by genetic drift counteracted by the remaining gene flow. Populations of Pinus cembra in the Carpathian Mountains are isolated and restricted to island-like stands at high-elevation mountain ranges. In contrast, paleobotanical data suggest an extended early Holocene distribution of P. cembra in the Carpathians and its surrounding areas, which has contracted to the currently disjunct occurrences. We analyzed the genetic variation of 11 Carpathian populations of P. cembra at chloroplast and, in part newly developed, nuclear microsatellites. Both marker types revealed low levels of genetic differentiation and a lack of isolation by distance, reflecting the post-glacial retraction of the species to its current distribution. Stronger effects of genetic drift were implied by the higher genetic differentiation found for haploid chloroplast than for diploid nuclear markers. Moreover, we found no association between the values of population genetic differentiation for the two marker types. Several populations indicated recent genetic bottlenecks and inbreeding as a consequence of decline in population sizes. Moreover, we found individuals in two populations from the Rodnei Mountains that strikingly differed in assignment probabilities from the remaining specimens, suggesting that they had been introduced from a provenance outside the studied populations. Comparison with Eastern Alpine P. cembra and individuals of the closely related Pinus sibirica suggests that these individuals presumably are P. sibirica. Our study highlights the importance of the maintenance of sufficiently large local population sizes for conservation due to low connectivity between local occurrences.