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Addition of a new resource in agroecosystems: Do cover crops alter the trophic positions of generalist predators?

Duyck Pierre François, Lavigne Anaïs, Vinatier Fabrice, Achard Raphaël, Okolle Justin, Tixier Philippe. 2011. Addition of a new resource in agroecosystems: Do cover crops alter the trophic positions of generalist predators?. Basic and Applied Ecology, 12 (1) : pp. 47-55.

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

Abstract : Generalist predators can play an important role in agroecosystems by controlling herbivores via top-down effects. As cover crops are increasingly used in agroecosystems, the effects of this resource on generalist predator diet need to be evaluated. We studied the effect of adding a cover crop, Brachiaria decumbens, on trophic niches of generalist predators in a banana agroecosystem by analysing stable isotope variation in C and N for Cosmopolites sordidus, a major banana pest, and its potential predators (spiders, ants, centipedes, and earwigs). While addition of the new resource did not change the trophic niche of the banana pest C. sordidus, the trophic position of the generalist predators was changed as indicated by _13C signature. Cover crop provided resources that are likely to support a community of insect herbivores, which are alternative preys for generalist predators. The failure of the cover crop to increase _15N signature is inconsistent with the hypothesis that the cover crop would increase intraguild predation. By providing alternative preys, the addition of a new resource in agroecosystems has the potential to increase populations of generalist predators and therefore pest control. (Résumé d'auteur)

Mots-clés Agrovoc : Musa, Cosmopolites sordidus, Brachiaria decumbens, Agroécosystème, Plante de couverture, Prédateur, Insecte utile, Régime alimentaire, Herbivore, Gestion intégrée des ravageurs, Lutte intégrée, Système de culture

Mots-clés géographiques Agrovoc : Martinique

Classification Agris : H10 - Pests of plants
F07 - Soil cultivation
F08 - Cropping patterns and systems

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Duyck Pierre François, CIRAD-PERSYST-UPR Systèmes bananes et ananas (MTQ)
  • Lavigne Anaïs
  • Vinatier Fabrice, CIRAD-PERSYST-UPR Systèmes bananes et ananas (MTQ)
  • Achard Raphaël, CIRAD-PERSYST-UPR Systèmes bananes et ananas (MTQ)
  • Okolle Justin, CARBAP (CMR)
  • Tixier Philippe, CIRAD-PERSYST-UPR Systèmes bananes et ananas (MTQ) ORCID: 0000-0001-5147-9777

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/558166/)

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