Niche breadth of Amazonian trees increases with niche optimum across broad edaphic gradients

Vleminckx Jason, Barrantes Oscar Valverde, Fortunel Claire, Paine C. E. Timothy, Bauman David, Engel Julien, Petronelli Pascal, Davila Nallarett, Rios Marcos, Valderrama Sandoval Elvis Harry, Mesones Italo, Allie Elodie, Goret Jean-Yves, Draper Frederick C., Guevara Andino Juan Ernesto, Béroujon Solène, Fine Paul V.A., Baraloto Christopher. 2023. Niche breadth of Amazonian trees increases with niche optimum across broad edaphic gradients. Ecology, 104 (7):e4053, 17 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.7910/DVN/VWAJYR

Résumé : Understanding how biotic interactions and environmental filtering mediated by soil properties shape plant community assembly is a major challenge in ecology, especially when studying complex and hyperdiverse ecosystems like tropical forests. To shed light on the influence of both factors, we examined how the edaphic optimum of species (their niche position) related to their edaphic range (their niche breadth) along different environmental gradients and how this translates into functional strategies. Here we tested four scenarios describing the shape of the niche breadth—niche position relationship, including one neutral scenario and three scenarios proposing different relative influences of abiotic and biotic factors on community assembly along a soil resource gradient. To do so, we used soil concentration data for five key nutrients (N, P, Ca, Mg, and K), along with accurate measurements of 14 leaf, stem, and root traits for 246 tree species inventoried in 101 plots located across Eastern (French Guiana) and Western (Peru) Amazonia. We found that species niche breadth increased linearly with species niche position along each soil nutrient gradient. This increase was associated with more resource acquisitive traits in the leaves and the roots for soil N, Ca, Mg, and K concentration, while it was negatively associated with wood density for soil P concentration. These observations agreed with one of our hypothetical scenarios in which species with resource conservation traits are confined to the most nutrient-depleted soils (abiotic filter), but they are outperformed by faster-growing species in more fertile conditions (biotic filter). Our results refine and strengthen support for niche theories of species assembly while providing an integrated approach to improving forest management policies.

Mots-clés Agrovoc : facteur édaphique, écologie forestière, plantation forestière, forêt tropicale, arbre forestier, fertilité du sol, sol tropical, écosystème forestier, conservation des sols, substance nutritive, forêt tropicale humide

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

Mots-clés libres : Abiotic filtering, Competitive exclusion, Functional traits, Neotropical forests, Niche breadth, Niche position, Range of resource use, Soil nutrient availability, Tree community assembly

Classification Agris : F40 - Écologie végétale

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

Agences de financement hors UE : Agence Nationale de la Recherche

Projets sur financement : (FRA) CEnter of the study of Biodiversity in Amazonia

Auteurs et affiliations

• Vleminckx Jason, Florida International University (USA)
• Barrantes Oscar Valverde, Florida International University (USA)
• Fortunel Claire, IRD (FRA)
• Paine C. E. Timothy, University of New England (AUS)
• Bauman David, Université de Montpellier (FRA)
• Engel Julien, Université de Montpellier (FRA)
• Petronelli Pascal, CIRAD-ES-UMR Ecofog (GUF)
• Davila Nallarett, IIAP (PER)
• Rios Marcos, IIAP (PER)
• Valderrama Sandoval Elvis Harry, Universidad Nacional de la Amazonia Peruana (PER)
• Mesones Italo, UC (USA)
• Allie Elodie, UAG (GLP)
• Goret Jean-Yves, INRAE (FRA)
• Draper Frederick C., Arizona State University (USA)
• Guevara Andino Juan Ernesto, Field Museum of Natural History (USA)
• Béroujon Solène, AgroParisTech (FRA)
• Fine Paul V.A., UC (USA)
• Baraloto Christopher, Florida International University (USA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/608256/)

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