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Spatial organisation of habitats in agricultural plots affects per-capita predator effect on conservation biological control: An individual based modelling study

Collard Blanche, Tixier Philippe, Carval Dominique, Lavigne Claire, Delattre Thomas. 2018. Spatial organisation of habitats in agricultural plots affects per-capita predator effect on conservation biological control: An individual based modelling study. Ecological Modelling, 388 : 124-135.

Article de revue ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q2, Sujet : ECOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion

Résumé : A highly advocated approach to enhance pest control by indigenous predators is to add or maintain appropriate non-crop plant habitats in agrosystems. Although the addition of non-crop plant habitats can enhance the number of predators in crop by increasing their food resources or shelter, the effect is often insufficient to reduce pest abundance or damage. A number of explanations were identified in previous studies; the ability of such habitats to enhance predators, in particular, is affected by the spatial organisation of the habitats at the landscape level. Here, we explore how intra-plot spatial patterns of non-crop habitats affect the per-capita predator effect on pest control. We use a spatially explicit and individual-based model to simulate the foraging movements of an earwig-like predator in a banana field. Predator movements within a day were based on a simple non-specific behavioural assumption: movement is a correlated random walk affected by habitats and edges. Population dynamic processes occurring at larger time or spatial scales, such as reproduction and immigration, were not considered. In this model, non-crop habitats added to plots were considered favourable to predators: movements were slower and more sinuous in non-crop habitat than in unfavourable habitats. The intra-plot spatial patterns of the non-crop habitat were built and characterised using landscape ecology concepts and metrics. We found that the per-capita predator effect was strongly affected by a spatial dilution of predators, induced by non-crop habitat addition, but this negative effect could be partially or fully mitigated by the spatial organisation of the non-crop habitat. At the banana plant level, a long edge length between the crop and non-crop habitat can compensate for this dilution effect by reducing the duration of the periods between predator visits to the banana plant. At the plot level, the best plots (i.e., those in which all banana plants were often visited by predators) were those with non-crop strips in the banana plant rows. Overall, the results support the idea that the spatial organisation of non-crop habitats at the plot level, characterised by the metric edge length in particular, can be managed to minimise the negative impact of the dilution effect.

Mots-clés Agrovoc : Musa, ravageur des plantes, lutte biologique, modélisation des cultures, habitat, écosystème, plante sauvage

Mots-clés complémentaires : Euborellia caraibea, marche aléatoire

Mots-clés libres : Euborellia caraibea, Generalist predators, Spatially explicit modelling, Correlated random walk, Banana field

Classification Agris : H10 - Ravageurs des plantes
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Collard Blanche, CIRAD-PERSYST-UPR GECO (FRA) - auteur correspondant
  • Tixier Philippe, CIRAD-PERSYST-UPR GECO (FRA) ORCID: 0000-0001-5147-9777
  • Carval Dominique, CIRAD-PERSYST-UPR GECO (FRA)
  • Lavigne Claire, INRA (FRA)
  • Delattre Thomas, INRA (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/593415/)

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