Elevational adaptation and plasticity in seedling phenology of temperate deciduous tree species

Détails

ID Serval
serval:BIB_28DFED90C80C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Elevational adaptation and plasticity in seedling phenology of temperate deciduous tree species
Périodique
Oecologia
Auteur(s)
Vitasse Y., Hoch G., Randin C.F., Lenz A., Scheepens J.F., Koerner C.
ISSN
1432-1939 (Electronic)
ISSN-L
0029-8549
Statut éditorial
Publié
Date de publication
2013
Volume
171
Numéro
3
Pages
663-678
Langue
anglais
Résumé
Phenological events, such as the initiation and the end of seasonal growth, are thought to be under strong evolutionary control because of their influence on tree fitness. Although numerous studies highlighted genetic differentiation in phenology among populations from contrasting climates, it remains unclear whether local adaptation could restrict phenological plasticity in response to current warming. Seedling populations of seven deciduous tree species from high and low elevations in the Swiss Alps were investigated in eight common gardens located along two elevational gradients from 400 to 1,700 m. We addressed the following questions: are there genetic differentiations in phenology between populations from low and high elevations, and are populations from the upper elevational limit of a species' distribution able to respond to increasing temperature to the same extent as low-elevation populations? Genetic variation of leaf unfolding date between seedlings from low and high populations was detected in six out of seven tree species. Except for beech, populations from high elevations tended to flush later than populations from low elevations, emphasizing that phenology is likely to be under evolutionary pressure. Furthermore, seedlings from high elevation exhibited lower phenological plasticity to temperature than low-elevation provenances. This difference in phenological plasticity may reflect the opposing selective forces involved (i.e. a trade-off between maximizing growing season length and avoiding frost damages). Nevertheless, environmental effects were much stronger than genetic effects, suggesting a high phenological plasticity to enable tree populations to track ongoing climate change, which includes the risk of tracking unusually warm springs followed by frost.
Mots-clé
Leaf unfolding, Budset, Common garden, Genecology, Elevational gradients
Pubmed
Web of science
Création de la notice
06/05/2015 11:35
Dernière modification de la notice
20/08/2019 14:08
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