High intraspecific growth variability despite strong evolutionary legacy in an Amazonian forest

Schmitt Sylvain, Herault Bruno, Derroire Géraldine. 2023. High intraspecific growth variability despite strong evolutionary legacy in an Amazonian forest. Ecology Letters, 26 (12) : 2135-2146.

https://doi.org/10.1111/ele.14318

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Résumé : Tree growth is key to species performance. However, individual growth variability within species remains underexplored for a whole community, and the role of species evolutionary legacy and local environments remains unquantified. Based on 36 years of diameter records for 7961 trees from 138 species, we assessed individual growth across an Amazonian forest. We related individual growth to taxonomy, topography and neighbourhood, before exploring species growth link to functional traits and distribution along the phylogeny. We found most variation in growth among individuals within species, even though taxonomy explained a third of the variation. Species growth was phylogenetically conserved up to the genus. Traits of roots, wood and leaves were good predictors of growth, suggesting their joint selection during convergent evolutions. Neighbourhood crowding significantly decreased individual growth, although much of inter-individual variation remains unexplained. The high intraspecific variation observed could allow individuals to respond to the heterogeneous environments of Amazonian forests.

Mots-clés Agrovoc : croissance, phylogénie, arbre forestier, accroissement forestier, espèce, écologie forestière, taxonomie, variation génétique, forêt

Mots-clés géographiques Agrovoc : Guyane française, France

Mots-clés libres : Forest gap dynamics, Functional traits, Paracou, Phylogeny, Topography, Tree growth

Classification Agris : F62 - Physiologie végétale - Croissance et développement
F40 - Écologie végétale
K01 - Foresterie - Considérations générales

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

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