Shifting trait coordination along a soil‐moisture‐nutrient gradient in tropical forests

Boisseaux Marion, Nemetschek Daniela, Baraloto Christopher, Burban Benoit, Casado-Garcia Angela, Cazal Jocelyn, Clément Jeanne, Derroire Géraldine, Fortunel Claire, Goret Jean-Yves, Heras Jonathan, Jaouen Gaëlle, Marechaux Isabelle, Scoffoni Christine, Vieilledent Ghislain, Vleminckx Jason, Coste Sabrina, Schimann Heidy, Stahl Clément. 2025. Shifting trait coordination along a soil‐moisture‐nutrient gradient in tropical forests. Functional Ecology, 39 (1) : 21-37.

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/AYZDBY / Url - autres données associées : https://github.com/mbthese/Metradica_FunctionalEcology

Résumé : Soil nutrients and water availability are strong drivers of tropical tree species distribution across scales. However, the physiological mechanisms underlying environmental filtering along these gradients remain incompletely understood. Previous studies mostly focused on univariate variation in structural traits, but a more integrative approach combining multiple physiological traits is needed to fully portray species functional strategies. We measured nine leaf functional traits related to trees' resource capture and hydraulic strategies for 552 individuals belonging to 21 tropical tree species across an environmental gradient in Amazonian forests. Our sampling included generalist and specialist species from terra firme (TF) and seasonally flooded (SF) forests. We tested the influence of the topographic wetness index, a proxy for soil moisture and nutrient gradients, on each trait separately and on the trait integration through multivariate indices computed from the eigenvalues of a principal component analysis on the traits of the species. Finally, we evaluated intraspecific trait variability (ITV) for generalists and specialists by calculating the coefficient of variation for each trait. Results showed that (1) the environment had a greater influence on trait syndromes than single trait variation. Moreover, (2) SF specialist species expressed a stronger leaf trait coordination than TF specialist species. Furthermore, (3) the ability of generalist species to occupy a broader range of environments was not reflected by a larger ITV than specialist species but by the capacity to change trait coordination across environments. Our work highlights the need to investigate functional strategies as multidimensional syndromes in physiological trait space to fully understand and predict species distribution along environmental gradients.

Mots-clés Agrovoc : forêt tropicale, arbre forestier, potassium, forêt tropicale humide, feuille, dendrométrie, fonction physiologique, disponibilité d'élément nutritif, substance nutritive, bois, espèce

Mots-clés géographiques Agrovoc : France, Guyane française, Amazonie

Mots-clés libres : Intraspecific variability, Leaf functional traits, Species strategies, Trait syndrome, Tropical tree species

Agences de financement hors UE : Agence Nationale de la Recherche

Projets sur financement : (FRA) CEnter of the study of Biodiversity in Amazonia, (FRA) Recherches avancées sur l'arbre et les écosytèmes forestiers

Auteurs et affiliations

• Boisseaux Marion, INRAE (FRA) - auteur correspondant
• Nemetschek Daniela, Université de Montpellier (FRA)
• Baraloto Christopher, Florida International University (USA)
• Burban Benoit, INRAE (FRA)
• Casado-Garcia Angela, University of La Rioja (ESP)
• Cazal Jocelyn, INRAE (GUF)
• Clément Jeanne, IRD (FRA)
• Derroire Géraldine, CIRAD-ES-UPR Forêts et sociétés (GUF) ORCID: 0000-0001-7239-2881
• Fortunel Claire, IRD (FRA)
• Goret Jean-Yves, INRAE (FRA)
• Heras Jonathan, Florida International University (USA)
• Jaouen Gaëlle, AgroParisTech (FRA)
• Marechaux Isabelle, CNRS (FRA)
• Scoffoni Christine, California State University (USA)
• Vieilledent Ghislain, CIRAD-BIOS-UMR AMAP (NCL) ORCID: 0000-0002-1685-4997
• Vleminckx Jason, ULB (BEL)
• Coste Sabrina, INRAE (FRA)
• Schimann Heidy, INRAE (FRA)
• Stahl Clément, INRAE (GUF)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/612529/)

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