قارن الطرق

	التنوع الوراثي لفيث	تقسيم التنوع البيتا
المجال	علم البيئة	علم البيئة
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1992	2010
صاحب الطريقة	David Faith	Andres Baselga
النوع	evolutionary diversity quantification	community differentiation analysis
المصدر التأسيسي	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.
الأسماء البديلة	phylogenetic diversity, PD, evolutionary distinctiveness, branch length	beta diversity, species turnover, nestedness, community dissimilarity
ذات صلة	4	4
الملخص	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.