Table 2.

Number of trees (in percentage) assigned to the different taxonomic groups in the three cohorts.

Taxonomic group	Cohort 1a	Cohort 1b	Cohort 2
Q. petraea	196 (46.4%)	110 (42.3%)	1570 (63.1%)
Q. robur	226 (53.6%)	135 (51.9%)	820 (32.9%)
Admixed	NA	15 (5.8%)	100 (4.0%)

NA: number of admixed individuals could not be estimated given the species assignment method based on leaf morphological traits (see text and Methods S4). Hence the two “morpho groups” of cohort 1a also comprised admixed individuals. Assuming that admixed individuals were not preferentially selected during the removal cut in 1992-1993 and equally distributed between the two “morpho groups”, the corrected numbers of Q. petraea and Q. robur in cohort 1a are 185 (43.8%) and 213 (50.4%). Admixed trees would have been 24 (5.8%) in cohort 1a

Species assignment was based either on SNP data using Bayesian clustering analysis (STRUCTURE) for cohort 1b and 2 or leaf morphological traits using principal component analysis for cohort 1a (Methods S4).