Old growth attributes by chain saw: how between-patch heterogeneity changes the metacommunities of beetles in temperate forests
Mitesser, O.; Cadotte, M.; Mori, A. S.; van der Plas, F.; Chao, A.; Rothacher, J.; Baessler, C.; Bevanda, M.; Biedermann, P. H. W.; Bradler, P. M.; Gomez, A. C.; Decker, O.; Delory, B. M.; Dittrich, S.; Fichtner, A.; Kreis, A.; Koestler-Albert, L.; von Oheimb, G.; Pierick, K.; Thorn, S.; Vogelfaenger, L.; Weisser, W.; Wegmann, M.; Wild, C. M.; Mueller, J.
Show abstract
Metacommunity theory has expanded our understanding of how spatial dynamics and local interactions influence species communities. Different assembly archetypes, reflecting different roles of species differences, habitat differences, and dispersal have been described, but we lack empirical studies specifically in terrestrial habitats testing which archetype is most important. In a replicated design we experimentally enhanced structural between-patch heterogeneity in homogeneous production forests and developed a statistical framework controlling for sample incompleteness to detect different metacommunity processes. Meta-analyses on >100K individuals of >1.3K beetle species showed an increase of [~]60 species in heterogenized forests at {gamma}-level promoted by increasing -diversity consistent with the mass-effect and an increase of {beta}-diversity by [~]10% supporting species-sorting. Additionally, we tested {beta}-deviations from random assembly as a proxy of neutral processes. Findings indicate that enhancing structural heterogeneity can shift forests from patch-dynamics dominance towards mass-effect and species-sorting, offering a promising pathway to restore biodiversity in managed landscapes.
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