Intra-annual dynamics of community composition and biodiversity-ecosystem functioning relationships in water-filled tree holes

These datasets support research on the temporal dynamics of aquatic macroinvertebrate communities and biodiversity–ecosystem functioning relationships in water-filled tree holes (WTHs) in a temperate forest in southern Switzerland. The data combine repeated biological sampling, environmental measurements, and leaf-litter decomposition rates collected over one year. The dataset includes macroinvertebrate community composition, functional feeding groups, physicochemical variables, decomposition metrics, and derived taxonomic and functional temporal beta-diversity indices. It enables investigation of how intra-annual environmental variability shapes community assembly and how temporal changes in biodiversity influence ecosystem functioning in small, dynamic freshwater ecosystems. The detailed metadata file provides full descriptions of all variables, units, and data structure.