Unifying Species Diversity, Phylogenetic Diversity, Functional Diversity, and Related Similarity and Differentiation Measures Through Hill Numbers

• Published in: Annual review of ecology, evolution, and systematics Vol. 45; no. 1; pp. 297 - 324
• Main Authors: Chao, Anne, Chiu, Chun-Huo, Jost, Lou
• Format: Journal Article
• Language: English
• Published: Palo Alto Annual Reviews 23-11-2014; Annual Reviews, Inc
• Subjects: beta diversity; Biodiversity; Biological taxonomies; Chaos; diversity decomposition; Diversity indices; diversity measures; doubling property; Ecological genetics; Ecology; Entropy; Evolutionary biology; Functional diversity; Numerical analysis; Phylogenetics; replication principle; Species diversity; Synecology; Taxonomy; trait diversity
• ISSN: 1543-592X; 1545-2069
• DOI: 10.1146/annurev-ecolsys-120213-091540

Hill numbers or the effective number of species are increasingly used to quantify species diversity of an assemblage. Hill numbers were recently extended to phylogenetic diversity, which incorporates species evolutionary history, as well as to functional diversity, which considers the differences among species traits. We review these extensions and integrate them into a framework of attribute diversity (the effective number of entities or total attribute value) based on Hill numbers of taxonomic entities (species), phylogenetic entities (branches of unit-length), or functional entities (species-pairs with unit-distance between species). This framework unifies ecologists' measures of species diversity, phylogenetic diversity, and distance-based functional diversity. It also provides a unified method of decomposing these diversities and constructing normalized taxonomic, phylogenetic, and functional similarity and differentiation measures, including
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-assemblage phylogenetic or functional generalizations of the classic Jaccard, Sørensen, Horn, and Morisita-Horn indexes. A real example shows how this framework extracts ecological meaning from complex data.