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Tree Genetics & Genomes

, 13:24 | Cite as

The colonization history of the Mediterranean dwarf palm (Chamaerops humilis L., Palmae)

  • Beatriz Guzmán
  • José M. Fedriani
  • Miguel Delibes
  • Pablo Vargas
Original Article
Part of the following topical collections:
  1. Population structure

Abstract

Chamaerops humilis L. (Mediterranean dwarf palm) is an important floristic element of the western Mediterranean region because it is the only palm species naturally distributed in both Europe and Africa. The combination of a time-calibrated phylogeny, a haplotype network and genetic diversity analyses based on plastid sequences, together with previous nuclear DNA fingerprint results, helped reconstruct the colonization history of the dwarf palm. Based on a sample of 218 individuals taken from 29 geographical areas that cover the current distribution of Chamaerops, we detected four plastid DNA (petA-psbJ) haplotypes distributed in two haplotype groups (lineage 1: haplotypes A/B; lineage 2: haplotypes C/D). Haplotypes A, B, and C showed a widespread geographical distribution in both Africa and Europe, whereas haplotype D was restricted to two African localities. Paleobotanical data, species distribution modeling and divergence time estimates suggest that Chamaerops diverged from Trachycarpus in the Miocene (27.05–6.05 Ma), followed by a split of the two C. humilis lineages that remained isolated during the Miocene-Pliocene. Divergence estimates also support a derived split into two haplotypes (A/B) in the Pleistocene, when the Mediterranean Sea barrier was in existence. This, together with geographical distribution of haplotypes A and B, strongly suggests that the disjunct distribution of C. humilis haplotypes in Europe and Africa is the result of long-distance dispersal (LDD) events rather than vicariance. In agreement with recurrent gene flow (events of LDD colonization), AMOVA revealed that most of the genetic variance was found among populations (61.52%). Irrespective of predominant plant translocations by humans or seed dispersal by natural means, our results support that current populations are the result of relatively recent contacts between Africa and Europe in the Quaternary.

Keywords

Dispersal barrier Haplotype Long-distance dispersal Mediterranean region ptDNA Vicariance 

Notes

Acknowledgments

The authors thank to four anonymous reviewers and W. Baker for suggestions that improved the quality of the manuscript, to J. Mayol for information about historical uses of dwarf palm in Baleares; to M. Ahmim, M. d’Amico, G. Calvo, J. Calzada, M. Clavero, C. Delibes, M. Jácome, A. Longo, I. Mateos, M. Navarro, E. Pérez de Gracia, E. Real, Riserva Naturale Orientata dello Zingaro, O. Rodríguez, A. Segura, J. Serrano, A. Vázquez, P. Vázquez, and Servicio de Protección de Especies de las Islas Baleares for field assistance and collection of plant material; and to E. Cano for lab assistance. This research was supported by the Spanish Ministry of Science and Innovation (CGL2010-21926), the Spanish Ministry of Economy and Competitiveness (CGL2015-67865-P), a FCT Portuguese grant (IF/00728/2013) to JMF, and a Juan de la Cierva fellowship to BG.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Data Archiving Statement

We have submitted the petA-psbJ sequences to Genbank. See supplementary Table S2 for accession numbers.

Supplementary material

11295_2017_1108_MOESM1_ESM.docx (23 kb)
ESM 1 (DOCX 22 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Beatriz Guzmán
    • 1
  • José M. Fedriani
    • 2
    • 3
  • Miguel Delibes
    • 2
  • Pablo Vargas
    • 1
  1. 1.Real Jardín Botánico, CSICMadridSpain
  2. 2.Estación Biológica de Doñana, CSICSevillaSpain
  3. 3.Centro de Ecologia Aplicada Prof. Baeta Neves/InBIOInstituto Superior de Agronomia, Universidade de LisboaLisbonPortugal

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