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Communication Dans Un Congrès Année : 2017

Relationships between diversity of natural enemies and pest predation levels in different farming and landscape contexts

Résumé

Biological control of pests by their natural enemies 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 enemies and levels of pest control. Whilst some studies have shown the importance of predator abundances or species richness, others have highlighted the role of predator species identity in pest predation levels. 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, and of spatial landscape heterogeneity related to the amount of semi-natural habitats. More recently, some studies have also explored the role of farming system heterogeneity at the landscape scale, but led to contradictory results. In the present study, we investigate the relationships between predator diversity and pest predation levels, 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 predatory 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-02787847 , version 1 (05-06-2020)

Identifiants

  • HAL Id : hal-02787847 , version 1
  • PRODINRA : 435709

Citer

Stéphanie Aviron, El Aziz Djoudi, Audrey Alignier, Manuel Plantegenest, Julien Petillon. Relationships between diversity of natural enemies and pest predation levels in different farming and landscape contexts. 5. International Symposium on Biological Control of Arthropods, Sep 2017, Langkawi, Malaysia. ⟨hal-02787847⟩
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