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Communication Dans Un Congrès Année : 2017

Relationships between diversity of carabid communities and pest predation levels in different farming and landscape contexts in hedgerow network landscapes

Résumé

Biological control of pests by their natural predators is considered as a key ecological process to reduce pesticide use in modern agricultural systems. A problematic issue in actual researches on biological control is the absence of consensus regarding the relationships between the diversity of natural predators of pests and levels of pest control. Whilst some studies have shown the importance of predator abundances or species richness (Snyder et al. 2006), others have highlighted the role of predator species identity in pest predation levels (Straub et al. 2006). Another crucial issue is to determine the environmental factors that drive the key components of predator diversity involved in pest control. Existing literature reports positive influences of low input farming practices (especially organic farming) at the field or farm scale (Bengtsson et al. 2005), and of spatial landscape heterogeneity related to the amount of semi-natural habitats (Bianchi et al. 2006). More recently, some studies have also explored the role of farming system heterogeneity at the landscape scale, but led to contradictory results (Puech et al. 2015; Diekötter et al. 2016). In the present study, we investigate the relationships between the diversity of predatory carabid beetles and pest predation levels in crops, considering different contexts in terms of field farming systems (organic vs. conventional farming) and landscape heterogeneity related to both semi-natural habitats and farming systems. We use data from a pluriannual survey of carabid beetles and predation levels of sentinel preys (aphids and weed seeds) in 20 cereal fields located in hedgerow network landscapes, in western France.
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Dates et versions

hal-02787846 , version 1 (05-06-2020)

Identifiants

  • HAL Id : hal-02787846 , version 1
  • PRODINRA : 435708

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Stéphanie Aviron, Manuel Plantegenest, Audrey Alignier. Relationships between diversity of carabid communities and pest predation levels in different farming and landscape contexts in hedgerow network landscapes. 18. European Carabidologist Meeting, Sep 2017, Rennes, France. ⟨hal-02787846⟩
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