GIFFARD, Brice; JACTEL, Herve; CORCKET, Emmanuel; BARBARO, Luc

doi:10.1016/j.baae.2012.08.004

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

GIFFARD, Brice
Biodiversité, Gènes & Communautés [BioGeCo]

JACTEL, Herve
Biodiversité, Gènes & Communautés [BioGeCo]

CORCKET, Emmanuel

Langue

Article de revue

Ce document a été publié dans

Basic and Applied Ecology. 2012, vol. 13, n° 5, p. 458-465

Elsevier

Résumé en anglais

The diversity of surrounding vegetation is thought to modify the interactions between a focal plant and its herbivores, disrupting (associational resistance) or enhancing (associational susceptibility) host plant location and colonisation. We compared the effects of host plant concentration on herbivory by generalist and specialist insects feeding on oak seedlings by increasing local concentration of seedlings. We also assessed the effects of the composition and structure of surrounding vegetation, both at stand and local levels. The damage caused by generalist leaf-feeding insects depended on the structure of plant communities at stand level, and increased with tree cover. By contrast, infestation by specialist leaf miners was affected by local understorey vegetation surrounding oak seedlings, and decreased with increasing shrub cover and stratification diversity. Leaf mine abundance was higher at higher oak seedling density, giving support to the host concentration hypothesis. However, the abundance of these specialist herbivores was also negatively correlated with damage caused by the generalist external leaf-feeders, suggesting competitive interactions.< Réduire

Mots clés

Host plant concentration

Mots clés en anglais

Specialist

Generalist

Insect herbivory

Plant neighbours

Biodiversity