Nutrient-based species selection is a prevalent driver of community assembly and functional trait space in tropical forests

Peguero Guille, Coello Fernando, Sardans Jordi, Asensio Dolores, Grau Oriol, LLusià Joan, Ogaya Romà, Urbina Ifigenia, Van Langenhove Leandro, Verryckt Lore T., Stahl Clément, Bréchet Laëtitia, Courtois Elodie A., Chave Jérôme, Herault Bruno, Janssens Ivan A., Peñuelas Josep. 2023. Nutrient-based species selection is a prevalent driver of community assembly and functional trait space in tropical forests. Journal of Ecology, 111 (6) : 1218-1230.

https://doi.org/10.1111/1365-2745.14089

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Url - jeu de données - Entrepôt autre : https://doi.org/10.5061/dryad.12jm63z2g

Résumé : Soil nutrient availability and functional traits interact in complex ways during the assembly of tree communities hindering our understanding of the implications that this may have for their phylogenetic and functional diversity. We combined abundance, taxonomic, phylogenetic and functional trait data of 222 tree species distributed along nutrient concentration gradients at 24 plots in two tropical forest study sites. We analysed micro and macronutrient concentration in organic and topsoil horizons and tested for the following: (1) nutrient-based species sorting due to contrasting trait–environment relationships, (2) whether nutrient filtering has consequences for phylogenetic and functional diversity, and functional space size and occupancy and (3) we mapped trait distributions across the phylogeny of tree species to track the evolutionary signature of nutrient availability. We found that total nitrogen (N), available phosphorus and total potassium in soil accounted for 68% of the variation in tropical tree species community composition, with strong associations with nutrient concentration for 89% of the tree species included in the analysis. This nutrient-based species selection was mediated by interactions between the three soil nutrient concentrations with leaf nitrogen, leaf thickness and wood density. Soil N concentration was positively associated with the functional space at site level. At plot level, soil N concentration positively correlated with functional evenness and it was negatively associated with the functional space not occupied by any species in the tree community. Despite the phylogenetic conservatism of leaf N across tree lineages even when not considering legumes, many sister-species pairs show contrasting values which match with their habitat preferences thus indicating the evolutionary lability of this trait, particularly within recently diversified clades. Synthesis. Our results demonstrate that soil nutrient-based species selection is a prevalent driver of community assembly in tropical forests, a process mediated by key functional traits within the leaf and wood economics spectrum. Functional space size and its filling increase with soil nutrient concentration, whereas niche vacancy decreases. This selection process has likely influenced tropical tree species diversification patterns via habitat specialization.

Mots-clés Agrovoc : forêt tropicale humide, forêt tropicale, phylogénie, substance nutritive, disponibilité d'élément nutritif, arbre forestier, disponibilité nutriments (sol), diversification, biodiversité, bois, interaction des nutriments, interaction nutriment nutriment, espacement

Mots-clés géographiques Agrovoc : Guyane française, France

Mots-clés libres : Community assembly, Determinants of plant community diversity and structure, Environmental filtering, French Guiana, Functional diversity, Macronutrients, Micronutrients, Traits, Tropical rainforests

Classification Agris : F40 - Écologie végétale
K01 - Foresterie - Considérations générales

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

Agences de financement européennes : European Research Council

Agences de financement hors UE : Fundación Ramón Areces, Agence Nationale de la Recherche

Projets sur financement : (EU) Effects of phosphorus limitations on Life, Earth system and Society, (FRA) CEnter of the study of Biodiversity in Amazonia, (FRA) ANAEE-Services

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