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

Author:

Rouabah Abdelhak1ORCID,Lasserre‐Joulin Françoise1,Plantureux Sylvain1,Taugourdeau Simon23,Amiaud Bernard4

Affiliation:

1. Université de Lorraine, INRAE, LAE Nancy F‐54000 France

2. UMR SELMET, CIRAD, INRAE, Institut Agro, Université de Montpellier Montpellier 34000 France

3. CIRAD, UMR SELMET‐PPZS Dakar Sénégal

4. UMR Silva, Université de Lorraine, AgroParisTech, INRAE Vandoeuvre Les Nancy, 54506 France

Abstract

AbstractSeveral 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.

Publisher

Wiley

Subject

Insect Science,General Biochemistry, Genetics and Molecular Biology,Agronomy and Crop Science,Ecology, Evolution, Behavior and Systematics

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