Cascading effects of landscape, mediated by mesoclimate, on carabid communities and weed seed predation in winter cereals
Résumé
Agricultural intensification, landscape simplification, and climate change threaten biodiversity and ecosystem services in arable lands. Increasing semi-natural habitats and landscape heterogeneity can mitigate these impacts by providing diverse habitats, resources and modifying climate at the landscape scale. As effective natural enemies in arable lands, carabids play a key role in pest and weed seed regulation and are influenced by field management and landscape. This study hypothesized that field management directly influences carabid communities and weed seed predation, while landscape factors affect them directly and indirectly through air temperature at the landscape scale. We sampled 77 winter cereal fields across 20 landscape windows representing regional landscape heterogeneity and composition. We monitored air temperature, carabid communities, and weed seed predation during two sampling sessions in late spring and early summer 2023. Piecewise Structural Equation Models were built to test for the direct and indirect effects of field-scale factors, landscape and climate at the landscape scale on carabids and weed seed predation. For both sampling sessions, results showed that the amount of semi-natural habitats and landscape heterogeneity primarily influence carabid activity-density and composition, which in turn affect weed seed predation. Grasslands, by providing resources and refuges, favour carabids but also appear linked to higher maximum air temperature, possibly influencing carabid composition via thermotolerance traits. The study highlights the importance of semi-natural habitats and landscape heterogeneity in shaping carabid communities and their ecosystem services in arable fields. Furthermore, for the first time, we have highlighted the potential influence of landscape context on carabids mediated by air temperature, which may affect weed regulation services through seed predation.
| Origine | Publication financée par une institution |
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Cite 10.57745/6GJBIB Jeu de données CARBONNE, B., Uroy, L., Ernoult, A., Mony, C., Jambon, O., Le Maux, C., & Quénol, H. (2024). Data for: Cascading effects of landscape, mediated by mesoclimate, on carabid communities and weed seed predation in winter cereals [Dataset]. Recherche Data Gouv. https://doi.org/10.57745/6GJBIB