[en] Forest decline and dieback are growing phenomena worldwide, resulting in severe, large-scale degradation of the canopy. This can profoundly alter the provision of trophic resources and microhabitats for canopy-dwelling arthropods. In 2019, we assessed the effect of oak decline on the community of canopy-dwelling Hymenoptera. We selected 21 oak stands and 42 plots, located in three forests in France, presenting contrasting levels of decline. Insects were sampled at the canopy level with green multi-funnel and flight-interception traps. We collected a particularly diverse community of 19,289 insect individuals belonging to 918 taxa, 10 larval trophic guilds and 7 nesting guilds. Oak decline had no effect on the abundance or richness of the overall community but significantly reshaped the community assemblages. Decline had contrasting effects depending on the taxa and guilds considered. Specialist parasitoids were more abundant at intermediate levels of decline severity while generalists were negatively affected. Taxa depending on ground-related resources and microhabitats were promoted. Saproxylic taxa were more abundant while xylophagous insects were negatively impacted. Reduced leaf area index promoted several guilds and the diversity of the overall community. While an increasing tree mortality rate enhanced the abundance and diversity of deadwood resources, it had negative impacts on several Hymenoptera guilds. Our results suggest that micro-environmental changes at the ground level due to canopy decline have major cascading effects on the communities of canopy-dwelling Hymenoptera. Our study highlights the relevance of studying Hymenoptera communities to investigate the outcomes of disturbances on forest biodiversity.
Disciplines :
Agriculture & agronomy Entomology & pest control Environmental sciences & ecology
Author, co-author :
Le Souchu, E. ; Laboratory of Physiology, Ecology and Environment (P2E, ex-LBLGC), University of Orléans, INRAE, Orléans, France
Cours, J. ; Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland ; School of Resource Wisdom, University of Jyväskylä, Jyväskylä, Finland ; UR EFNO, INRAE, Nogent-sur-Vernisson, France
Cochenille, T.; Laboratory of Physiology, Ecology and Environment (P2E, ex-LBLGC), University of Orléans, INRAE, Orléans, France
Bouget, C. ; UR EFNO, INRAE, Nogent-sur-Vernisson, France
Bankhead-Dronnet, S. ; Laboratory of Physiology, Ecology and Environment (P2E, ex-LBLGC), University of Orléans, INRAE, Orléans, France
Braet, Y. ; O.D. Phylogeny and Taxonomy, Entomology, Royal Belgian Institute of Natural Sciences, Brussels, Belgium ; Laboratory of functional and evolutionary entomology, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
Burguet, P.; Cébazat, France
Gabard, C.; Laboratory of Physiology, Ecology and Environment (P2E, ex-LBLGC), University of Orléans, INRAE, Orléans, France
Galkowski, C.; Société Linnéenne de Bordeaux, Bordeaux, France
Gereys, B.; Oraison, France
Herbrecht, F. ; Sainte-Anne-sur-Vilaine, France
Joncour, B. ; Laboratory of Physiology, Ecology and Environment (P2E, ex-LBLGC), University of Orléans, INRAE, Orléans, France
Marhic, E. ; Maurecourt, France
Michez, Denis ; Université de Mons - UMONS > Faculté des Sciences > Service de Zoologie
Buhl, P. Neerup; Zoological Museum, Department of Entomology, University of Copenhagen, Copenhagen, Denmark
Noblecourt, T.; Réseau entomologie de l'Office National des Forêts, Antugnac, France
Notton, D.G. ; Invertebrates Section, Natural Sciences Department, National Museums Collection Centre, Edinburgh, United Kingdom
Penigot, W.; Saint-Juéry, France
Rasplus, J.-Y. ; CBGP, INRAE, CIRAD, IRD, Montpellier SupAgro, University of Montpellier, Montpellier, France
Robert, T.; Baccarat, France
Staverlokk, A. ; Norwegian Institute for Nature Research, Trondheim, Norway
Vincent-Barbaroux, C. ; Laboratory of Physiology, Ecology and Environment (P2E, ex-LBLGC), University of Orléans, INRAE, Orléans, France
Sallé, A. ; Laboratory of Physiology, Ecology and Environment (P2E, ex-LBLGC), University of Orléans, INRAE, Orléans, France
Responses of the hyper-diverse community of canopy-dwelling Hymenoptera to oak decline
Publication date :
May 2024
Journal title :
Insect Conservation and Diversity
ISSN :
1752-458X
eISSN :
1752-4598
Publisher :
John Wiley and Sons Inc
Volume :
17
Issue :
3
Pages :
430 - 448
Peer reviewed :
Peer Reviewed verified by ORBi
Development Goals :
15. Life on land
Research unit :
S869 - Zoologie
Research institute :
R100 - Institut des Biosciences
Funding text :
We thank C. Moliard (INRAE), G. Parmain (INRAE), X. Pineau (P2E, ex‐LBLGC) and O. Denux (INRAE) for their technical assistance. We also thank T. Wood, S. Flaminio and P. Rosa for their help in determining the Andrenidae, Halictidae and Chrysididae. We are grateful to the National Forest Office (Office National des Forêts) for their field assistance. We would like to thank Vicky Moore for her English proofreading and the two anonymous reviewers for their comments, which helped to improve this article considerably. This work was supported by Région Centre‐Val de Loire Project no. 2018‐00124136 (CANOPEE) coordinated by A. Sallé.
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