[en] Deadwood stores about 8% of global carbon stock and its decomposition is a key factor in forest ecosystems. Deadwood-associated (saproxylic) organisms constitute a food web that sustains a substantial part of biodiversity globally. After fungi, saproxylic beetles are the most prominent agents of structural deadwood decomposition in forests. They are often classified according to their presumed linkto the deadwood decomposition gradient, generally as feeding on fresh wood, decayed wood, fungi or as predators. These classifications are, however, based on ecomorphological characters (e.g., trophic morphology, habitat use) while information on their diet is globally limited. Carbon (δ13C) and nitrogen (δ15N) stable isotope ratios represent potential useful tracers to improve knowledge on the trophic ecology of this model group and the whole decomposition food web. We performed stable isotope analysis on 121 beetle species (530 samples) from a mixed-deciduous forest in Central Europe in order to (1) characterize drivers of saproxylic beetles’ isotopic variability with respect to potential food sources along the wood decomposition gradient and in relation to the potentially key intrinsic factors such as phylogeny and body size, and (2) to assess how isotope information matches with two trophic guild classifications based on ecomorphological characters which are commonly used in ecological studies. The analysis revealed a clear pattern of δ13C increase and simultaneous C:N ratio decrease across potential food sources along the gradient from fresh to decayed deadwood and fungi. Beetle phylogeny and body size explained a significant part of their isotope variability, with values of δ13C being lower in smaller species. After filtering out these effects, the δ13C values reflected the position of beetle species on the decomposition gradient only loosely. Fungi-feeding guild had higher δ13C values than the guilds dependent on fresher deadwood, but otherwise the guilds were indistinguishable. Deadwood consumers did not differ from predators. The isotopic niches of different feeding guilds largely overlapped, and the large observed variation suggests that not only fungi feeders but species from most guilds may depend considerably on fungi and that mixed trophic strategies may be more common in the decomposition food web than currently acknowledged.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Environmental sciences & ecology Entomology & pest control Zoology
Author, co-author :
Kozel, Petr; Biology Centre of the Czech Academy of Sciences, Czech Republic > Institute of Entomology
Lejeune, Benjamin ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Écologie et de Conservation des Amphibiens (LECA)
Lepoint, Gilles ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Ecologie trophique et isotopique ; F.R.S.-FNRS - Fonds de la Recherche Scientifique
Drag, Lukas; Biology Centre of the Czech Academy of Sciences > Institute of Entomology
Cizek, Lukas; Biology Centre of the Czech Academy of Sciences > Institute of Entomology,
Sebek, Pavel; Biology Centre of the Czech Academy of Sciences, Czech Republic > Institute of Entomology
Language :
English
Title :
Stable isotopes of saproxylic beetles reveal low differences among trophic guilds and suggest a high dependence on fungi
Publication date :
22 February 2025
Journal title :
Ecological Monographs
ISSN :
0012-9615
Publisher :
Wiley-Blackwell, United States
Volume :
95
Issue :
1
Pages :
e70002
Peer reviewed :
Peer Reviewed verified by ORBi
Development Goals :
15. Life on land
Funding number :
GAJU 038/2019/P
Funding text :
projects GAJU 011/2019/P and GAJU 038/2019/P provided by the Grant Agency of the University of South Bohemia, Czech Republic
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