Forest decline differentially affects trophic guilds of canopy-dwelling beetles
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RESEARCH PAPER
Forest decline differentially affects trophic guilds of canopy-dwelling beetles Aurélien Sallé 1 & Guilhem Parmain 2 & Benoît Nusillard 2 & Xavier Pineau 1 & Ravène Brousse 1 & Tiphanie Fontaine-Guenel 1,2 & Romain Ledet 2 & Cécile Vincent-Barbaroux 1 & Christophe Bouget 2 Received: 13 February 2020 / Accepted: 27 July 2020 # INRAE and Springer-Verlag France SAS, part of Springer Nature 2020
Abstract & Key message Decline can affect the structure, resources, and microclimates of the forest canopy, and potentially have cascading effects on canopy-dwelling species. Our survey shows that an oak decline can promote saproxylic beetles, especially xylophagous ones, and generalist phyllophagous weevils. However, it negatively affects specialist leaf-eating species and has no effect on seed-eating weevils. & Context Decline in a context of climate change is expected to induce considerable changes in forest structure, potentially affecting habitat opportunities and trophic resources for numerous species. Nonetheless, the consequences of decline in forest biodiversity have rarely been studied. & Aims We aimed to characterize the impact of oak decline on different guilds of canopy-dwelling beetles. & Methods Beetles were sampled for three consecutive years in oak stands exhibiting different levels of decline. Several guilds were considered: (i) Buprestidae, (ii) other saproxylic beetles split into wood-boring species and non-wood-boring species, (iii) seed-eating weevils, and (iv) specialist and generalist leaf-eating weevils. & Results Overall, decline had positive effects on the abundance and biomass of beetles, though contrasting variations were observed at the species or guild levels. Wood-boring species, especially the main oak-associated buprestids, and other saproxylic species benefitted from decline conditions. However, at odds with the insect performance hypothesis, decline had a positive effect on generalist leaf-eating species, a negative effect on specialist leaf-eating species, and a null effect on seed-eating species.
Handling Editor: Cécile Robin Contributions of the co-authors Conceptualization: A. Sallé & C. Bouget; Methodology: G. Parmain, B. Nusillard, X. Pineau; Data acquisition: G. Parmain, B. Nusillard, X. Pineau, R. Brousse, T. Fontaine-Guenel, R. Ledet, C. Vincent-Barbaroux; Writing—original draft: A. Sallé & C. Bouget; Writing—review & editing: A. Sallé, C. Bouget, G. Parmain, C. Vincent-Barbaroux; Supervision: A. Sallé, Funding acquisition: A. Sallé This article is part of the topical collection on Entomological issues during forest diebacks * Aurélien Sallé [email protected]
Tiphanie Fontaine-Guenel [email protected]
Guilhem Parmain [email protected]
Romain Ledet [email protected]
Benoît Nusillard [email protected]
Cécile Vincent-Barbaroux [email protected]
Xavier Pineau [email protected] Ravène Brousse [email protected]
Christophe Bouget [email protected] Ex
