Description of oak stands.

<p>5 <i>Q. robur</i> islands (11.24 ha, 1 ha, 4 ha, 4.4 ha, trees along a 500m road),</p><p>1 <i>Q. faginea</i> island (26.8 ha).</p><p>Q. pubescens.</p><p>Q. faginea.</p

Pollen dispersal distributions.

<p>In each stand, observed pollen dispersal is represented by dotted line, confidence intervals are delimited by solid lines. ________ confidence limits ------------- observed distribution.</p

Location of the eight studied white oak stands across Europe.

<p>Location of the eight studied white oak stands across Europe.</p

Variation of the percentage of hybrid acorns per mother tree.

<p>In each stand, each bar is a mother tree, bar height represents the percentage of acorns collected from the mother tree with a father assigned from a species different from the species of the mother tree (hence a hybrid). □ <i>Quercus petraea</i> ▪ <i>Quercus robur </i> Undetermined species.</p

Results of seedlings parentage analyses.

<p><i>Ns</i>: number of seedlings. <i>s</i>: percentage of selfing. <i>h</i>: percentage of hybrids, SD: standard deviation.</p><p>The three seedlings with two parents assigned were the result of selfing</p

Seed dispersal distributions.

<p>In each stand, observed seed dispersal is represented by dotted line, confidence intervals are delimited by solid lines. ________ confidence limits ------------- observed distribution.</p

Variation of the percentage of fathers assigned per mother tree.

<p>In each stand, each bar is a mother tree, bar height represents the percentage of acorns collected from the mother tree with a father assigned. □ <i>Quercus petraea</i> ▪ <i>Quercus robur </i> Undetermined species.</p

Variation of the relative reproductive success of male parents.

<p>The number of different fathers assigned after paternity analysis is given for each stand. In each stand, each bar is a father, fathers are ordered by decreasing reproductive success, bar height represents the percentage of the total number of acorns sired by the father. □ <i>Quercus petraea</i> ▪ <i>Quercus robur </i> Undetermined species.</p

Results of paternity analyses.

<p><i>Nof</i>: number of offspring with a father assigned (%). <i>pi</i>: pollen immigration. <i>Nf</i>: number of different fathers assigned. <i>Ngp</i>: Number of genotyped parents. <i>Nf</i>/<i>Ngp</i> (%). <i>Nof</i>/<i>Nf</i>: mean number of offspring per father (standard deviation (SD)). (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0085130#pone-0085130-g002" target="_blank">Fig. 2:</a> male reproductive success). <i>Ne</i>: effective number of fathers (1/Σ(<i>f_i</i>²), where <i>f_i</i> is the relative reproductive success of each father).</p

Cross-fertilization and hybridisation rates.

<p>Percentages of intraspecific and hybrid crossing: <i>Qp</i> (<i>Q. petraea</i>), <i>Qr</i> (<i>Q. robur</i>), hybrid crosses: female ♀ × male ♂. <i>h</i>: percentage of hybridisation among acorns with an assigned father. <i>H</i>/<i>M</i>: mean number of hybridisation events per mother (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0085130#pone-0085130-g005" target="_blank">Fig. 5:</a> variation of the percentage of hybrid acorns per mother tree), SD: standard deviation. <i>s</i>: percentage of selfing.</p><p>Qp = Q. petraea, Qr = Q. pubescens.</p