Functional trait composition of carabid beetle communities predicts prey suppression through both mass ratio and niche complementarity mechanisms

Rouabah Abdelhak, Lasserre-Joulin Françoise, Plantureux Sylvain, Taugourdeau Simon, Amiaud Bernard. 2024. Functional trait composition of carabid beetle communities predicts prey suppression through both mass ratio and niche complementarity mechanisms. Insect Science, 31 (4) : 562-574.

Résumé : Several components of predator functional diversity have been hypothesized to influence prey suppression through either niche complementarity or mass ratio effects. Nevertheless, most studies have used a functional group approach when assessing the role of these predators in ecosystem functioning. By adopting a trait-based approach, we evaluated the relative contributions of carabid diversity components in predicting prey suppression. Our results highlight the importance of both taxonomic and functional diversity components of carabids as key drivers of prey suppression. Prey suppression was best predicted by carabid densities, with the dominance of Poecilus cupreus potentially driving the positive effect of community total abundance through the mass ratio effect. Prey suppression increased with increasing the density of large carabids. In addition, carabid eye diameter and antennal length were key functional traits for predicting prey suppression. Furthermore, prey suppression increased with increasing carabid functional richness following the niche complementarity effect. In contrast to functional richness, functional evenness and functional divergence of carabid communities were weakly correlated with prey suppression. By identifying which diversity components of carabid communities contribute the most to increase prey suppression, our results can guide efforts aiming to predict the relationship between diversity of these predators and ecosystem functioning.

Mots-clés Agrovoc : biodiversité, prédateur, technique de prévision, écosystème

Mots-clés libres : Predation, Carabid beetles, Functional diversity

Classification Agris : L20 - Écologie animale
L40 - Anatomie et morphologie des animaux
L60 - Taxonomie et géographie animales

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

Agences de financement hors UE : Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement, Région Lorraine, Ministère de l'Agriculture et de la Souveraineté alimentaire

Projets sur financement : (FRA) Projet CASDAR Entomophages

Auteurs et affiliations

• Rouabah Abdelhak, Université de Lorraine (FRA) - auteur correspondant
• Lasserre-Joulin Françoise, Université de Lorraine (FRA)
• Plantureux Sylvain, Université de Lorraine (FRA)
• Taugourdeau Simon, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0001-6561-3228
• Amiaud Bernard, Université de Lorraine (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605970/)

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