قارن الطرق

	التنوع الوراثي لفيث	تحليل جدوى التجمعات السكانية (Population Viability Analysis)
المجال	علم البيئة	علم البيئة
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1992	1981
صاحب الطريقة	David Faith	Mark Shaffer
النوع	evolutionary diversity quantification	extinction risk assessment
المصدر التأسيسي	Faith, D. P. (1992). Conservation evaluation and phylogenetic diversity. Biological Conservation, 61(1), 1-10.	Shaffer, M. L. (1981). Minimum population sizes for species conservation. BioScience, 31(2), 131-134.
الأسماء البديلة	phylogenetic diversity, PD, evolutionary distinctiveness, branch length	PVA, extinction risk, minimum viable population, MVP
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.	Population Viability Analysis (PVA), introduced by Shaffer (1981), estimates the probability that a population will persist over a given time period under specified conditions. PVA combines demographic models (Leslie matrices, IPMs) with stochastic simulation to project population trajectories, quantifying extinction risk. This allows conservation planners to assess whether a population will likely persist, evaluate management scenarios, and estimate the minimum viable population (MVP) size for long-term persistence. PVA is a decision-support tool, not a precise predictor.