Methoden vergleichen

	Populations-Viabilitäts-Analyse	Integrales Projektionsmodell
Fachgebiet	Ökologie	Ökologie
Familie	Process / pipeline	Process / pipeline
Entstehungsjahr	1981	2000
Urheber	Mark Shaffer	Stephen Ellner and Mark Rees
Typ	extinction risk assessment	size-structured population projection
Wegweisende Quelle	Shaffer, M. L. (1981). Minimum population sizes for species conservation. BioScience, 31(2), 131-134.	Easterling, M. R., Ellner, S. P., & Dixon, P. M. (2000). Size-specific sensitivity: applying a new structured population model. Ecology, 81(3), 694-708.
Aliasnamen	PVA, extinction risk, minimum viable population, MVP	IPM, continuous size structure, kernel model, size-structured population
Verwandt	4	4
Zusammenfassung	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.	Integral projection models (IPMs) are a class of structured population models that use continuous traits (size, age, height) to describe population dynamics. Introduced by Easterling and colleagues (2000) and developed extensively by Ellner, Rees, and collaborators, IPMs overcome limitations of age- or stage-structured models by treating individual traits as continuous. They use integration to project populations forward in time, making them particularly suitable for organisms with continuous size distributions or flexible developmental pathways. IPMs enable estimation of population growth rate (λ), sensitivity analysis, and projection under changing environmental conditions.