Biodiversity effects on ecosystem functioning are driven by resource quality and contamination
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Le résumé fourni par la source
Abstract Biodiversity–ecosystem functioning relationships are increasingly explained by species' traits and resource quality differences rather than richness alone, yet cross‐trophic effects and environmental context remain poorly resolved. We experimentally tested how basal resource diversity and chemical stress interact to shape ecosystem functioning in a detritus‐based freshwater system. We manipulated leaf litter diversity (alder, hazel and beech) and selectively contaminated alder with the insecticide imidacloprid, quantifying microbially mediated decomposition, detritivore leaf processing efficiency and detritivore growth. Leaf litter identity was the primary driver of ecosystem functioning. Alder, a nutrient‐rich species, disproportionately enhanced process rates, highlighting the importance of species identity and resource quality. Leaf mixtures combined species differing in resource quality and generated non‐additive effects, with complementarity and dominance enhancing detritivore‐mediated processes, particularly leaf processing efficiency. In contrast, microbial decomposition showed weak or negative diversity effects, suggesting constraints on resource use. Imidacloprid reduced detritivore growth without altering leaf processing efficiency, due to direct toxicity after consumption or indirect effects of imidacloprid on nutritional quality. Contaminated alder acted as an ecological trap, as detritivores preferentially consumed a high‐quality resource despite the negative consequences associated with the imidacloprid treatment, suppressing positive biodiversity effects. Our results demonstrate that leaf species identity, likely reflecting differences in resource quality, and consumer behaviour jointly regulate the transfer of biodiversity effects across trophic levels, while environmental stress can disrupt these mechanisms independently of richness. Read the free Plain Language Summary for this article on the Journal blog.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Biodiversity effects on ecosystem functioning are driven by resource quality and contamination
- Date Crossref
- 23/08/2026
- Éditeur
- Wiley
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Koblenz and Landau pays non établi dans la noticeUniversité ou école supérieure
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University of Namur pays non établi dans la noticeUniversité ou école supérieure
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University of Southern Denmark pays non établi dans la noticeUniversité ou école supérieure
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University of Duisburg-Essen pays non établi dans la noticeUniversité ou école supérieure
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Department of Natural and Environmental Sciences RPTU University Kaiserslautern‐Landau pays non établi dans la noticeUniversité ou école supérieure
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Research Unit of Environmental and Evolutionary Biology Université de Namur Namur Belgium pays non établi dans la noticeUniversité ou école supérieure
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University Alliance Ruhr Essen Germany Department of Ecotoxicology Research Center One Health Ruhr pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Biology University of Duisburg‐Essen Essen Germany Department of Ecotoxicology pays non établi dans la noticeUniversité ou école supérieure
University of Koblenz and Landau, University of Namur et University of Southern Denmark, avec 5 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.