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Tree diversity limits the impact of an invasive forest pest

Guyot, Virginie and Castagneyrol, Bastien and Vialatte, Aude and Deconchat, Marc and Selvi, Federico and Bussotti, Filippo and Jactel, Hervé Tree diversity limits the impact of an invasive forest pest. (2015) PLoS ONE, 10 (9). 1-16. ISSN 1932-6203

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Official URL: http://dx.doi.org/10.1371/journal.pone.0136469

Abstract

The impact of invasive herbivore species may be lower in more diverse plant communities due to mechanisms of associational resistance. According to the “resource concentration hypothesis” the amount and accessibility of host plants is reduced in diverse plant communities, thus limiting the exploitation of resources by consumers. In addition, the “natural enemy hypothesis” suggests that richer plant assemblages provide natural enemies with more complementary resources and habitats, thus promoting top down regulation of herbivores. We tested these two hypotheses by comparing crown damage by the invasive Asian chestnut gall wasp (Dryocosmus kuriphilus) on chestnut trees (Castanea sativa) in pure and mixed stands in Italy. We estimated the defoliation on 70 chestnut trees in 15 mature stands sampled in the same region along a gradient of tree species richness ranging from one species (chestnut monocultures) to four species (mixtures of chestnut and three broadleaved species). Chestnut defoliation was significantly lower in stands with higher tree diversity. Damage on individual chestnut trees decreased with increasing height of neighboring, heterospecific trees. These results suggest that conservation biological control method based on tree species mixtures might help to reduce the impact of the Asian chestnut gall.

Item Type:Article
Additional Information:Thanks to Public Library of Science editor. The definitive version is available at http://journals.plos.org/ The original PDF of the article can be found at : http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0136469
HAL Id:hal-01391246
ProdINRA Id:327154
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Other partners > Université de Bordeaux (FRANCE)
Other partners > Università degli Studi di Firenze (ITALY)
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Deposited On:26 Oct 2016 11:07

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