Influence de la pédologie et des pratiques agricoles sur les communautés de coléoptères carabidés et le biocontrôle de ravageurs et d’auxiliaires

Abstract : Soils are, to a large extent, responsible for the proper functioning of ecosystems. They participate to many ecosystem services and are, consequently, acting over many problematics of the 21st century. To search the drivers of ecosystem services in, and on soils, the SoilServ project describes soils around the municipality of Naizin, in Brittany, France, and various populations of the soil macrofauna (notably earthworms and carabids). One goal of this study was also to consider the interactions between ecosystem services, more particularly between the ones with which earthworms are related and biological control from carabid beetles. The catch of carabid beetles was made with Barber traps, principally in winter wheat. The results allow us to see which parameters are responsible for composition of carabid communities. Microbial biomass, pH, soil temperature, bulk density, soil humidity and hydromorphy seem to affect those communities. Ploughing frequency and crop diversity during the whole rotation also have an effect, according to our results. Few satisfying results emerged from the study of crop pests’ and auxiliaries’ predation. Hence, we can neither confirm nor deny the effect an interaction between carabid beetles and earthworms over ecosystem services provided by the latter.
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Master Thesis
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Théo Gayrard. Influence de la pédologie et des pratiques agricoles sur les communautés de coléoptères carabidés et le biocontrôle de ravageurs et d’auxiliaires. Sciences du Vivant [q-bio]. 2018. ⟨dumas-01961553⟩

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