How collectively integrated are ecological communities?

Zelnik Yuval R., Galiana Nuria, Barbier Matthieu, Loreau Michel, Galbraith Eric, Arnoldi Jean-François. 2024. How collectively integrated are ecological communities?. Ecology Letters, 27 (1):e14358, 14 p.

https://doi.org/10.1111/ele.14358

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/10.5281/zenodo.7537451

Résumé : Beyond abiotic conditions, do population dynamics mostly depend on a species' direct predators, preys and conspecifics? Or can indirect feedback that ripples across the whole community be equally important? Determining where ecological communities sit on the spectrum between these two characterizations requires a metric able to capture the difference between them. Here we show that the spectral radius of a community's interaction matrix provides such a metric, thus a measure of ecological collectivity, which is accessible from imperfect knowledge of biotic interactions and related to observable signatures. This measure of collectivity integrates existing approaches to complexity, interaction structure and indirect interactions. Our work thus provides an original perspective on the question of to what degree communities are more than loose collections of species or simple interaction motifs and explains when pragmatic reductionist approaches ought to suffice or fail when applied to ecological communities.

Mots-clés Agrovoc : modèle mathématique, dynamique des populations, écologie, biocénose, modèle de simulation

Mots-clés libres : Complexity, Eigenvalues, Holism, Indirect interactions, Interaction network, Interaction structure, Lotka-Volterra models, Press perturbations, Reductionism, Stability

Classification Agris : U60 - Sciences de la vie et de la Terre
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Agences de financement européennes : European Commission

Agences de financement hors UE : Agence Nationale de la Recherche, H2020 Marie Skłodowska-Curie Actions

Programme de financement européen : H2020

Projets sur financement : (FRA) Saclay Plant Sciences, (EU) BIOFOODWEB

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