TPDc: from species to communities | A unified framework for functional diversity | 1. Species are not of primary concern | 1.a. Indices for single units | 1.b. Indices for multiple units | Overlap-based functional dissimilarity, and its decomposition (dissim) | 2. Species are of primary concern | 2.a. Indices for single units | Functional redundancy of communities (redundancy) | 2.b. Indices for multiple units