手法を比較

	Faith's Phylogenetic Diversity	機能的多様性（Functional Diversity）
分野	生態学	生態学
系統	Process / pipeline	Process / pipeline
提唱年	1992	2008
提唱者	David Faith	Olivier Mouillot
種類	evolutionary diversity quantification	trait-based diversity analysis
原典	Faith, D. P. (1992). Conservation evaluation and phylogenetic diversity. Biological Conservation, 61(1), 1-10.	Villéger, S., Mason, N. W., & Mouillot, D. (2008). New multidimensional functional diversity indices for a multifaceted framework in functional ecology. Ecology, 89(8), 2290-2301.
別名	phylogenetic diversity, PD, evolutionary distinctiveness, branch length	functional traits, trait diversity, ecological niche, functional space
関連	4	4
概要	Faith's Phylogenetic Diversity (PD), introduced by David Faith (1992), measures the evolutionary diversity within a community by summing the branch lengths of a phylogenetic tree connecting all species. Unlike species richness, which counts species equally regardless of evolutionary relationships, PD weights species by their evolutionary distinctiveness: a community with evolutionarily distant species has higher PD than one dominated by recently diverged species. PD is widely used in conservation to prioritize protection of species and habitats that preserve evolutionary history.	Functional diversity quantifies the range and abundance distribution of functional traits (morphology, physiology, behavior) among species in a community. Developed by Mouillot and colleagues (2008), functional diversity indices measure how different species are in their ecological roles and resource use strategies. Unlike species richness (number of species), functional diversity captures the breadth of ecological strategies, predicting ecosystem function and stability.