YGUEL, Benjamin; BAILEY, Richard I.; VILLEMANT, Claire; BRAULT, Amaury; JACTEL, Hervé; PRINZING, Andreas

doi:10.1007/s00442-014-3026-3

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YGUEL, Benjamin
German Centre for Integrative Biodiversity Research [iDiv]
Ecosystèmes, biodiversité, évolution [Rennes] [ECOBIO]

BAILEY, Richard I.
Centre for Ecological and Evolutionary Synthesis [CEES]

VILLEMANT, Claire
Origine, structure et évolution de la biodiversité [OSEB]

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Ce document a été publié dans

Oecologia. 2014, vol. 176, n° 2, p. 521-532

Springer Verlag

Résumé en anglais

Neighboring plants within a local community may be separated by many millions of years of evolutionary history, potentially reducing enemy pressure by insect herbivores. However, it is not known how the evolutionary isolation of a plant affects the fitness of an insect herbivore living on such a plant, especially the herbivore’s enemy pressure. Here, we suggest that evolutionary isolation of host plants may operate similarly as spatial isolation and reduce the enemy pressure per insect herbivore. We investigated the effect of the phylogenetic isolation of host trees on the pressure exerted by specialist and generalist enemies (parasitoids and birds) on ectophagous Lepidoptera and galling Hymenoptera.We found that the phylogenetic isolation of host trees decreases pressure by specialist enemies on these insect herbivores. In Lepidoptera, decreasing enemy pressure resulted from the density dependence of enemy attack, a mechanism often observed in herbivores. In contrast, in galling Hymenoptera, enemy pressure declined with the phylogenetic isolation of host trees per se, as well as with the parallel decline in leaf damage by non-galling insects. Our results suggest that plants that leave their phylogenetic ancestral neighborhood can trigger, partly through simple density-dependency, an enemy release and fitness increase of the few insect herbivores that succeed in tracking these plants.< Réduire

Mots clés en anglais

Community phylogeny

Macroevolution

Trophic chain

Parasitism rate

Temperate forest

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Insect herbivores should follow plants escaping their relatives

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