Leaf morphological differentiation between Quercus robur and Quercus petraea is stable across western European mixed oak stands
| Autor: | Antoine Kremer, Reiner Finkeldey, S. Espinel, Sabine Steinhoff, Jean-Luc Dupouey, Barbara van Dam, Jochen Kleinschmit, Ulrike M Csaikl, Ian Forrest, Marcela Tutkova, Alexis Ducousso, Jan H. Jensen, Vincent Badeau, Andrew J. Lowe, J. Douglas Deans, Joan Cottrell, R.C. Munro, U. Lopez de Heredia |
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| Přispěvatelé: | Unité de recherches forestières (BORDX PIERR UR ), Institut National de la Recherche Agronomique (INRA), Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) |
| Rok vydání: | 2002 |
| Předmět: |
feuille
0106 biological sciences bosecologie taxonomie Quercus petraea Population CHENE SESSILE 010603 evolutionary biology 01 natural sciences morfologie Canonical analysis Quercus robur CHENE PEDONCULE taxonomy---morphologie [SDV.SA.SF]Life Sciences [q-bio]/Agricultural sciences/Silviculture forestry Discriminant function analysis Multiple correspondence analysis morphology Botany education ComputingMilieux_MISCELLANEOUS education.field_of_study leaf Ecology biology Ecologie en Milieu Forestry genetica 15. Life on land biology.organism_classification Fagaceae Principal component analysis eik Europa 010606 plant biology & botany |
| Zdroj: | Annals of Forest Science Annals of Forest Science, Springer Nature (since 2011)/EDP Science (until 2010), 2002, 59 (7), pp.777-787. ⟨10.1051/forest:2002065⟩ Annales des sciences forestières Annales des sciences forestières, INRA/EDP Sciences, 2002, 59, pp.777-787 HAL Annals of Forest Science, 59(7), 777-787 Annals of Forest Science 59 (2002) 7 Scopus-Elsevier |
| ISSN: | 1297-966X 1286-4560 0003-4312 |
| Popis: | International audience; 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.; La différenciation morphologique des feuilles entre Quercus robur et Quercus petraea est stable à travers les peuplements mélangés de chênes de l'ouest européen. La variabilité de la morphologie foliaire a été etudiée dans neuf peuplements mélangés de chênes (Quercus petraea et Q. robur) en Europe sur la base d'un échantillon exhaustif moyen de 170 arbres/espèce/peuplement. Trois méthodes d'analyses multivariables ont été utilisées (ACD : analyse canonique discriminante ; ACP : analyse en composantes principales ; AFC : analyse factorielle des correspondances). Les trois méthodes aboutissent à des résultats congruents. La première variable synthétique de chaque méthode se caractérise par une distribution bimodale, chaque mode correspondant à une espèce. La distribution de la première variable ne manisfeste pas de discontiunuité pouvant indiquer l'existence d'un troisième groupe, correspondant à des arbres avec des morphologies de type intermédiaire. Une méthode d'identification rapide basée sur les deux caractères les plus discriminants (nombre de veines intercalaires et longueur du pétiole) a été proposée et validée sur un autre jeu de données (98 % d'identifications correctes). La structure de la variation morphologique entre les deux espèces résulte sans doute de l'hybridation entre elles, et de l'hérédité des caractères morphologiques. |
| Databáze: | OpenAIRE |
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