DOI: 10.5061/dryad.9hd71135
title: Data from: The Atlantic-Mediterranean watershed, river basins and glacial history shape the genetic structure of Iberian poplars

description: Recent phylogeographic studies in several organisms have elucidated the
 varied effects of Pleistocene glaciations and of Pre-Pleistocene events on
 populations from glacial refuge areas. This study investigates those
 effects in riparian trees (Populus spp.), whose particular features may
 convey enhanced resistance to climate fluctuations. We analysed the
 phylogeographic structure of white, black and grey poplars (44, 13 and two
 populations, respectively) in the Iberian Peninsula using plasmid DNA
 microsatellites and sequences, we assessed fine-scale spatial genetic
 structure and the extent of clonality in four white and one grey poplar
 populations using nuclear microsatellites and we determined quantitative
 genetic differentiation (Q_ST) for growth traits among populations and
 river systems in white poplar. Black poplar displayed higher regional
 diversity and lower differentiation than white poplar, reflecting its
 higher cold-tolerance. In white poplar, the Atlantic and Mediterranean
 drainage basins but also river basins were strongly differentiated,
 indicating confinement to the lower river courses during glacial periods
 and moderate gene exchange along coastlines. In this species, the northern
 Iberian river basins had lower diversity, fewer private haplotypes and
 larger clonal assemblies than the southern basins, indicating a stronger
 effect of glaciations in the north. The dependence of white poplar on
 phreatic water was evidenced by stronger isolation by distance among river
 basins than within them. Despite strong genetic structure and frequent
 asexual propagation in white poplar, some growth traits displayed adaptive
 divergence between drainage and river basins (Q_ST &gt; F_ST),
 highlighting the remarkable capacity of riparian tree populations to adapt
 to regional environmental conditions.
description: Phylogeography_populations_cpSSRsData of alleles scores of the chloroplast microsatellites ccmp2 and ccmp5, comprising 59 populations of Populus alba, P. nigra, and P. xcanescens, of Spain and one population of Morocco. n=628 trees. Collected by D. Macaya-Sanz, M. Heuertz, N. Alba, U. Lopez-de-Heredia, A.I. de-Lucas, E. Hidalgo, C. Maestro, A. Prada, R. Alia, and S.C. Gonzalez-Martinez. For contact, please email: santiago@inia.es. | Column headings | ID: Identity code of the individual collected; Population: Populations where the individual is located and its subsequents; Province: Administrative province were populations are sited; ccmp2 & ccmp5: Allele scores of these regions. Missing data are represented by a hyphen '-'. Additional information for the data can be found in the related publication.nuSSRs for Clonality within population assessmentData of alleles scores of the five nuclear microsatellites PMGC2852, ORPM312, ORPM344, ORPM127, and ORPM30, comprising 5 populations of Populus alba and P. xcanescens, of Spain. n=200 trees. Collected by D. Macaya-Sanz, M. Heuertz, N. Alba, U. Lopez-de-Heredia, A.I. de-Lucas, E. Hidalgo, C. Maestro, A. Prada, R. Alia, and S.C. Gonzalez-Martinez. For contact, please email: santiago@inia.es. | Column headings | ID: Identity code of the individual collected; Population: Populations were the individual is located; UTM_X & UTM_Y: UTM coordinates in ED50; Remaining columns: Allele scores of these regions. Missing data are represented by '-999'. Additional information for the data can be found in the related publication.Clonal_populations_ nuSSRs.txt