השוואת שיטות

	מגוון פילוגנטי של פיית'	חלוקת גיוון בטא
תחום	אקולוגיה	אקולוגיה
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1992	2010
הוגה השיטה	David Faith	Andres Baselga
סוג	evolutionary diversity quantification	community differentiation analysis
מקור מכונן	Faith, D. P. (1992). Conservation evaluation and phylogenetic diversity. Biological Conservation, 61(1), 1-10.	Baselga, A. (2010). Partitioning the turnover and nestedness components of beta diversity. Global Ecology and Biogeography, 19(1), 134-143.
כינויים	phylogenetic diversity, PD, evolutionary distinctiveness, branch length	beta diversity, species turnover, nestedness, community dissimilarity
קשורות	4	4
תקציר	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.	Beta diversity partitioning quantifies how species composition differs among sites, decomposing community dissimilarity into two components: species turnover (replacement of species across sites) and nestedness (loss of species from species-rich sites). Developed by Baselga (2010), this framework reveals whether sites differ because they have different species (turnover) or because some sites are subsets of others (nestedness). This distinction has ecological and conservation implications: turnover suggests environmental heterogeneity or speciation, while nestedness suggests habitat loss or extinction.