Section: Zoology
Topic: Population biology, Biology of interactions, Agricultural sciences

The open bar is closed: restructuration of a native parasitoid community following successful control of an invasive pest

10.24072/pcjournal.43 - Peer Community Journal, Volume 1 (2021), article no. e30.

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The rise of the Asian chestnut gall wasp Dryocosmus kuriphilus in France has benefited the native community of parasitoids originally associated with oak gall wasps by becoming an additional trophic subsidy and therefore perturbing population dynamics of local parasitoids. However, the successful biological control of this pest has then led to significant decreases in its population densities. Here we investigate how the invasion of the Asian chestnut gall wasp Dryocosmus kuriphilus in France and its subsequent control by the exotic parasitoid Torymus sinensis has impacted the local community of native parasitoids. We explored 5 years of native community dynamics within 26 locations during the rise and fall of the invasive pest. In an attempt to understand how mechanisms such as local extinction or competition come into play, we analyzed how the patterns of co-occurrence between the different native parasitoid species changed through time. Our results demonstrate that native parasitoid communities experienced increased competition as the D. kuriphilus levels of infestation decreased. During the last year of the survey, two alternative patterns were observed depending on the sampled location: either native parasitoid communities were represented by an extremely limited number of species occurring at low densities, in some cases no native parasitoid species at all, or they were dominated by one main parasitoid: Mesopolobus sericeus. These two patterns seemed to correlate with the habitat type, M. sericeus being more abundant in semi-natural habitats compared to agricultural lands, the former known to be natural reservoirs for native parasitoids. These results highlight how the boom-and-bust dynamics of an invasive pest followed by successful biological control can deeply alter the structure of native communities of natural enemies.

Published online:
DOI: 10.24072/pcjournal.43
Type: Research article
Muru, David 1; Borowiec, Nicolas 1; Thaon, Marcel 1; Ris, Nicolas 1; Viciriuc, Madalina I. 2; Warot, Sylvie 1; Vercken, Elodie 1

1 Institut Sophia Agrobiotech -INRAE, Université Côte d’Azur, CNRS, ISA –Sophia-Antipolis, France
2 Research Group in Invertebrate Diversity and Phylogenetics, Faculty of Biology, Al. I. Cuza University, bd Carol I no. 11, 700506 –Iasi, Romania
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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     title = {The open bar is closed: restructuration of a native parasitoid community following successful control of an invasive pest},
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Muru, David; Borowiec, Nicolas; Thaon, Marcel; Ris, Nicolas; Viciriuc, Madalina I.; Warot, Sylvie; Vercken, Elodie. The open bar is closed: restructuration of a native parasitoid community following successful control of an invasive pest. Peer Community Journal, Volume 1 (2021), article  no. e30. doi : 10.24072/pcjournal.43. https://peercommunityjournal.org/articles/10.24072/pcjournal.43/

Peer reviewed and recommended by PCI : 10.24072/pci.zool.100004

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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