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Leaf morphological differentiation between Quercus robur and Quercus petraea is stable across western European mixed oak stands / Antoine Kremer in Annals of Forest Science, vol 59 n° 7 (novembre 2002)    

Public [article]  inAnnals of Forest Science > vol 59 n° 7 (novembre 2002) . - pp 777 - 787 Titre : Leaf morphological differentiation between Quercus robur and Quercus petraea is stable across western European mixed oak stands Type de document : Article/Communication Auteurs : Antoine Kremer, Auteur ; Jean-Luc Dupouey, Auteur ; J. Douglas Deans, Auteur ; Joan Cottrell, Auteur ; Ulrike Csaikl, Auteur ; Reiner Finkeldey, Auteur ; Santiago Espinel, Auteur ; et al., Auteur Année de publication : 2002 Article en page(s) : pp 777 - 787 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] Europe occidentale [Termes IGN] feuille (végétation) [Termes IGN] peuplement forestier [Termes IGN] Quercus pedunculata [Termes IGN] Quercus sessiliflora [Termes IGN] taxinomie Mots-clés libres : morphology  leaf  Quercus robur  Quercus petraea  taxonomy Résumé : (auteur) Leaf 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, an “easy to use” discriminant function applicable to a major part of the natural distribution of the species was constructed. Validation on an independent set of trees provided a 98% rate of correct identification. The results were interpreted in the light of earlier reports about extensive hybridization occurring in mixed oak stands. Maternal effects on morphological characters, as well as a lower frequency or fitness of hybrids in comparison with parent species could explain the maintenance of two modes, which might be composed of either pure species or pure species and introgressed forms. Numéro de notice : A2002-055 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest:2002065 En ligne : http://dx.doi.org/10.1051/forest:2002065 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81013 [article]

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