Hierarchical trait filtering at different spatial scales determines beetle assemblages in deadwood

Neff, Felix
Hagge, Jonas
Achury, Rafael
Ambarlı, Didem
Ammer, Christian
Schall, Peter
Seibold, Sebastian
Staab, Michael
Weisser, Wolfgang W.
Gossner, Martin M.
Environmental filters-including those resulting from biotic interactions-play a crucial role during the assembly of ecological communities. The importance of scale has thereby been acknowledged but filters at different scales have rarely been quantified in relation to each other, although these hierarchically nested filters eventually determine which communities assemble from a regional species pool. Saproxylic beetles offer an ideal system to study such hierarchically nested environmental filters. Three steps of filtering during the community assembly of these deadwood-dependent beetles are proposed. First, starting from a regional species pool, species must disperse to forest sites. Second, within a site, individuals need to find a patch with preferred microclimatic conditions. Third, the conditions of a single deadwood object (i.e. tree species identity, decomposition stage) at this patch will determine, which species colonise and establish. To study these hierarchical filters, we used unique long-term data ets of saproxylic beetle diversity from trap catches at 29 sites and from emergence traps on 694 experimentally installed deadwood logs at the same sites in three regions in Germany. To relate different environmental filters to beetle assemblages, we used a set of 13 functional traits that are hypothesised to relate to different filters at different scales. We show that all three hierarchical filtering steps resulted in reductions of functional diversity and simultaneous shifts in the functional composition of beetle assemblages, reflecting the roles of different traits in response to different filters. Trait composition changed most strongly at the last filtering step, that is, depended on tree species identity and decomposition stage. We showed that if community assembly is analysed as a hierarchical multi-step process based on data from different spatial scales, environmental filters can be quantified at these scales. As such, a better understanding of the role that different filters play at different spatial scales can be reached. Read the free Plain Language Summary for this article on the Journal blog.


Contrasting roles of water chemistry, lake morphology, land-use, climate and spatial processes in driving phytoplankton richness in the Danish landscape
Özkan, Korhan; Sondergaard, Martin; Lauridsen, Torben L.; Liboriussen, Lone; Svenning, Jens-Christian (2013-06-01)
Understanding of the forces driving the structure of biotic communities has long been an important focus for ecology, with implications for applied and conservation science. To elucidate the factors driving phytoplankton genus richness in the Danish landscape, we analyzed data derived from late-summer samplings in 195 Danish lakes and ponds in a spatially-explicit framework. To account for the uneven sampling of lakes in the monitoring data, we performed 1,000 permutations. A random set of 131 lakes was ass...
Data Descriptor: A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins
MANTZOUKİ, Evanthia; et. al. (2018-10-23)
Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consis...
Do interactions between eutrophication and CO2 enrichment increase the potential of elodeid invasion in tropical lakes?
Mormul, Roger Paulo; Thomaz, Sidinei Magela; Jeppesen, Erik (Springer Science and Business Media LLC, 2020-09-01)
Understanding the roles of eutrophication and CO2 enrichment in the invasive success of aquatic plants is an ecological challenge with relevance to climate change. We tested the hypotheses that (1) eutrophication of freshwaters increases the invasive success of the submersed aquatic plant Hydrilla verticillata; (2) CO2-enrichment makes freshwater systems more prone to H. verticillata invasion; and (3) interactions between eutrophication and CO2 enrichment increase the potential of H. verticillata invasion. ...
Trait-based community assembly of submersed macrophytes subjected to nutrient enrichment in freshwater lakes: Do traits at the individual level matter?
Fu, Hui; Yuan, Guixiang; Jeppesen, Erik (Elsevier BV, 2020-03-01)
Understanding how functional traits distributed across ecological scales as well as environmental gradients are central issues of trait-based assembly processes. However, whether environmental filters act on individuals or species mean traits remains poorly tested. Here, we measured four functional traits - shoot height, specific leaf area, lamina thickness, and leaf dry mass content - of 4432 individuals from 30 submersed macrophyte species across 26 lakes in south China, covering a broad nutrient gradient...
Variation in growth, reproduction, and resource allocation in an aquatic plant,Vallisneria spinulosa: the influence of amplitude and frequency of water level fluctuations
Li, Lei; Ding, Mingming; Jeppesen, Erik (Springer Science and Business Media LLC, 2020-09-01)
Water level fluctuations (WLF), one of the most affected ecological drivers by climate change, are dominant forces controlling submerged macrophyte performance and distribution in freshwater ecosystems. Submerged macrophytes are prominent components of shallow lakes, predicting their response to WLF is therefore crucial for the management and conservation of these valuable and vulnerable ecosystems. We conducted an experiment in 15 outdoor mesocosms to explore the influence of WLF on the performance ofValli...
Citation Formats
F. Neff et al., “Hierarchical trait filtering at different spatial scales determines beetle assemblages in deadwood,” FUNCTIONAL ECOLOGY, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/100548.