00548nas a2200145   4500008004100000245017200041210006900213260000900282300001100291490000700302100001800309700001700327700001500344856004300359       1995                        eng d00aGenetic, morphological, ecological and phenological differentiation between Quercus petraea (Matt.) Liebl. and Quercus robur L. in a mixed stand of Northwest of France0 aGenetic morphological ecological and phenological differentiatio  c1995  a1 - 100 v441 aBacilieri, R.1 aDucousso, A.1 aKremer, A.  uhttps://quercus.myspecies.info/node/7602355nas a2200337   4500008004100000245013200041210006900173260000900242300001200251490000700263520141100270100001501681700001601696700001401712700001701726700001501743700001801758700001601776700001501792700002001807700001601827700001701843700001601860700002201876700001301898700001601911700001401927700001801941700001501959856004301974       2002                        eng d00aLeaf morphological differentiation between Quercus robur and Quercus petraea is stable across western European mixed oak stands0 aLeaf morphological differentiation between Quercus robur and Que  c2002  a777-7870 v593 aLeaf morphology was assessed in nine mixed oak stands (Quercus petraea and Q. robur) located in eight European countries.Exhaustive sampling was used in an area of each stand where the two species coexisted in approximately equal proportions (about 170 trees/species/ stand). Fourteen leaf characters were assessed on each of 5 to10 leaves collected from the upper part of each tree. Three multivariate statistical techniques (CDA, canonical discriminant analysis; PCA, principal component analysis; MCA, multiple correspondence analysis) were used in two different ways: first on the total set of leaves over all stands (global analysis) and second, separately within each stand (local analysis). There was a general agreement of the results among the statistical methods used and between the analyses conducted (global and local). The first synthetic variable derived by each multivariate analysis exhibited a clear and sharp bimodal distribution, with overlapping in the central part. The two modes were interpreted as the two species, and the overlapping region was interpreted as an area where the within-species variations were superimposed. There was no discontinuity in the distribution or no visible evidence of a third mode which would have indicated the existence of a third population composed of trees with intermediate morphologies. Based on petiole length and number of intercalary veins, an1 aKremer, A.1 aDupouey, J.1 aDeans, J.1 aCottrell, J.1 aCsaikl, U.1 aFinkeldey, R.1 aEspinel, S.1 aJensen, J.1 aKleinschmit, J.1 aVan Dam, B.1 aDucousso, A.1 aForrest, I.1 ade Heredia, Lopez1 aLowe, A.1 aTutkova, M.1 aMunro, R.1 aSteinhoff, S.1 aBadeau, V.  uhttps://quercus.myspecies.info/node/5202180nas a2200181   4500008004100000245010200041210006900143260000900212300001200221490000700233520159600240100001601836700001701852700001401869700001601883700001501899856008401914       2005                        eng d00aChloroplast DNA variation of Quercus rubra L. in North America and comparison with other Fagaceae0 aChloroplast DNA variation of Quercus rubra L in North America an  c2005  a513-5240 v143 aAbstract Quercus rubra is one of the most important timber and ornamental tree species from eastern North America. It is a widespread species growing under variable ecological conditions. Chloroplast DNA variation was studied by PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism) in 290 individuals from 66 populations sampled throughout the natural range. A total of 12 haplotypes were detected, with one found in 75% of the trees. Population differentiation is relatively low (GST = 0.46), even when similarities between haplotypes are taken into account (NST = 0.50), pointing to a weak phylogeographical structure. Furthermore, no spatial structure of genetic diversity could be detected. The genetic differentiation increased northwards, reflecting the postglacial history of Q. rubra. The unusual aspect of this study was the low level of chloroplast DNA genetic differentiation in Q. rubra compared to that typically observed in other oak species. Palynological evidence indicates that during the last glacial maximum, Q. rubra had one major distribution range with populations located relatively far to the north, resulting in only modest movement northwards when climate improved, whereas European white oaks were largely restricted to the southern European peninsulas and experienced extensive movements during the postglacial period. The contrasted geographical features and levels of tree species richness of both continents might further explain why congeneric species sharing similar life history traits have genetic structures that are so different.1 aMagni, C.R.1 aDucousso, A.1 aCaron, H.1 aPetit, R.J.1 aKremer, A.  uhttp://www.blackwell-synergy.com/links/doi/10.1111/j.1365-294X.2005.02400.x/abs