Negative effects of forest gaps on dung removal in a full‐factorial experiment

2022 | journal article. A publication with affiliation to the University of Göttingen.

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​Negative effects of forest gaps on dung removal in a full‐factorial experiment​
Staab, M.; Achury, R.; Ammer, C.; Ehbrecht, M.; Irmscher, V.; Mohr, H. & Schall, P. et al.​ (2022) 
Journal of Animal Ecology91(10) art. 1365-2656.13792​.​ DOI: https://doi.org/10.1111/1365-2656.13792 

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Authors
Staab, Michael; Achury, Rafael; Ammer, Christian; Ehbrecht, Martin; Irmscher, Veronika; Mohr, Hendrik; Schall, Peter; Weisser, Wolfgang W.; Blüthgen, Nico
Abstract
Abstract Ecosystem functioning may directly or indirectly—via change in biodiversity—respond to land use. Dung removal is an important ecosystem function central for the decomposition of mammal faeces, including secondary seed dispersal and improved soil quality. Removal usually increases with dung beetle diversity and biomass. In forests, dung removal can vary with structural variables that are, however, often interrelated, making experiments necessary to understand the role of single variables on ecosystem functions. How gaps and deadwood, two main outcomes of forest management influence dung removal, is unknown. We tested if dung removal responds to gap creation and deadwood provisioning or if treatment effects are mediated via responses of dung beetles. We expected lower removal rates in gaps due to lower dung beetle biomass and diversity. We sampled dung beetles and measured dung removal in a highly‐replicated full‐factorial forest experiment established at 29 sites in three regions of Germany (treatments: Gap, Gap + Deadwood, Deadwood, Control). All gaps were experimentally created and had a diameter of around 30 m. Dung beetle diversity, biomass and dung removal were each lower in gaps than in controls. Dung removal decreased from 61.9% in controls to 48.5% in gaps, irrespective of whether or not the gap had deadwood. This treatment effect was primarily driven by dung beetle biomass but not diversity. Furthermore, dung removal was reduced to 56.9% in the deadwood treatment. Our findings are not consistent with complementarity effects of different dung beetle species linked to biodiversity‐ecosystem functioning relationships that have been shown in several ecosystems. In contrast, identity effects can be pronounced: gaps reduced the abundance of a large‐bodied key forest species (Anoplotrupes stercorosus), without compensatory recruitment of open land species. While gaps and deadwood are important for many forest organisms, dung beetles and dung removal respond negatively. Our results exemplify how experiments can contribute to test hypotheses on the interrelation between land use, biodiversity and ecosystem functioning.
Dung removal is lower in forest gaps, which is driven by lower dung beetle biomass (relative to closed canopy forest). This is the first study from a new large‐scale forest experiment in Germany. image
Issue Date
2022
Journal
Journal of Animal Ecology 
Organization
Zentrum für Biodiversität und Nachhaltige Landnutzung ; Fakultät für Forstwissenschaften und Waldökologie ; Burckhardt-Institut ; Abteilung Waldbau und Waldökologie der gemäßigten Zonen 
ISSN
0021-8790
eISSN
1365-2656
Language
English
Sponsor
Deutsche Forschungsgemeinschaft https://doi.org/10.13039/501100001659

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