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'Quercus L., 1753' 
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Partager le résultat de cette rechercheGèdre, les chênes du canton Cassaët / Michel Bartoli in Pyrénées, 258 (04/2014)
Titre : Gèdre, les chênes du canton Cassaët Type de document : Imprimé Auteurs : Michel Bartoli (1946-) Année de publication : 2014 Article en page(s) : 52-61 Langues : Français (fre) Catégories : [CBNPMP-Géographique] Gédre Mots-clés : Quercus L., 1753 Résumé : Présentation de la chênaie du Cassaët au dessus de Gèdre (65) et de son évolution depuis le début du Xxe siècle. L'intérêt de cette forêt tient à la fois à l'abondance des chênes (habituellement peu fréquents à cette altitude) et au rôle de protection qu'elle a joué. Diverses espèces de chênes sont représentées ainsi que leurs hybrides (24%). Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142493
in Pyrénées > 258 (04/2014) . - 52-61Bartoli, Michel (1946-) 2014 Gèdre, les chênes du canton Cassaët. Pyrénées, 258: 52-61.Exemplaires (1)
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Titre : Increasing spring temperatures favor oak seed production in temperate areas Type de document : Numérique Auteurs : Thomas Caignard ; Antoine Kremer (1951-) ; Cyril Firmat ; Manuel Nicolas ; Samuel Venner ; Sylvain Delzon (1977-) Année de publication : 2017 Article en page(s) : 1-8 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Global change, écosystème, évolution
[CBNPMP-Thématique] Graines
[CBNPMP-Thématique] Reproduction végétative
[CBNPMP-Thématique] Système de reproductionMots-clés : Quercus L., 1753 Résumé : The changes in reproductive phenology (i.e. timing of flowering and fruiting) observed in recent decades demonstrate that tree reproduction has already been altered by climate change. However, understanding the impact of these changes in reproductive success and fitness remains a major challenge for ecologists. We describe here a previously unreported phenomenon: a significant increase in the reproductive effort (seed production) of temperate oaks with increasing spring temperature, observed over the last decade. In contrast, no relationship was found between seed production and precipitation. This sensitivity of seed production to temperature was confirmed by a “space-for-time” substitution based on elevation gradients. Our findings suggest that global warming may enhance oak reproductive effort in temperate ecosystems. Nevertheless, while fitness can be enhanced by higher levels of seed production, it also depends on the frequency and synchronization of mast seeding production, which may also be influenced by climate change. Lien pérenne : DOI : 10.1038/s41598-017-09172-7 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=143285
in Scientific reports > (17 August 2017) . - 1-8Caignard, Thomas, Kremer, Antoine (1951-), Firmat, Cyril, Nicolas, Manuel, Venner, Samuel, Delzon, Sylvain (1977-) 2017 Increasing spring temperatures favor oak seed production in temperate areas. Scientific reports: 1-8.Documents numériques
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Article (2017)URL
Titre : To what extent is altitudinal variation of functional traits driven by genetic adaptation in European oak and beech ? Type de document : Numérique Auteurs : Caroline C Bresson ; Yann Vitasse (1981-) ; Antoine Kremer (1951-) ; Sylvain Delzon (1977-) Année de publication : 2011 Article en page(s) : 1164-1174 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Adaptation au milieu
[CBNPMP-Thématique] Adaptation au milieu et aux conditions de culture
[CBNPMP-Thématique] Adaptation naturelle au climat, résistanceMots-clés : Quercus L., 1753 Fagus L., 1753 Résumé : The phenotypic responses of functional traits in natural populations are driven by genetic diversity and phenotypic plasticity. These two mechanisms enable trees to cope with rapid climate change. We studied two European temperate tree species (sessile oak and European beech), focusing on (i) in situ variations of leaf functional traits (morphological and physiological) along two altitudinal gradients and (ii) the extent to which these variations were under environmental and/or genetic control using a common garden experiment. For all traits, altitudinal trends tended to be highly consistent between species and transects. For both species, leaf mass per area displayed a positive linear correlation with altitude, whereas leaf size was negatively correlated with altitude. We also observed a significant increase in leaf physiological performance with increasing altitude: populations at high altitudes had higher maximum rates of assimilation, stomatal conductance and leaf nitrogen content than those at low altitudes. In the common garden experiment, genetic differentiation between populations accounted for 0-28% of total phenotypic variation. However, only two traits (leaf mass per area and nitrogen content) exhibited a significant cline. The combination of in situ and common garden experiments used here made it possible to demonstrate, for both species, a weaker effect of genetic variation than of variations in natural conditions, suggesting a strong effect of the environment on leaf functional traits. Finally, we demonstrated that intrapopulation variability was systematically higher than interpopulation variability, whatever the functional trait considered, indicating a high potential capacity to adapt to climate change. Lien pérenne : DOI : 10.1093/treephys/tpr084 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=143283
in Tree pysiology > 31 (11) (November 2011) . - 1164-1174Bresson, Caroline C, Vitasse, Yann (1981-), Kremer, Antoine (1951-), Delzon, Sylvain (1977-) 2011 To what extent is altitudinal variation of functional traits driven by genetic adaptation in European oak and beech ? Tree pysiology, 31(11): 1164-1174.Documents numériques
Article (2011)URL
