Methoden vergleichen

	SIAR-Mischungsmodell	Populations-Viabilitäts-Analyse
Fachgebiet	Ökologie	Ökologie
Familie	Process / pipeline	Process / pipeline
Entstehungsjahr	2010	1981
Urheber	Andrew Parnell	Mark Shaffer
Typ	diet and source apportionment analysis	extinction risk assessment
Wegweisende Quelle	Parnell, A. C., Inger, R., Bearhop, S., & Jackson, A. L. (2010). Source partitioning using stable isotopes: coping with too much variation. PLoS ONE, 5(3), e9672.	Shaffer, M. L. (1981). Minimum population sizes for species conservation. BioScience, 31(2), 131-134.
Aliasnamen	isotope mixing model, Bayesian mixing model, source apportionment, diet analysis	PVA, extinction risk, minimum viable population, MVP
Verwandt	4	4
Zusammenfassung	The Stable Isotope Analysis in R (SIAR) mixing model is a Bayesian framework for estimating the proportional contributions of dietary sources to a consumer, using stable isotope ratios. Developed by Parnell and colleagues (2010) and implemented in the R package siar (and its successor MixSIAR), this method integrates isotopic data from potential food sources and consumers to infer diets. It accounts for uncertainty in isotope fractionation (the shift in isotope ratios between diet and tissue) and natural variation among source populations, producing probability distributions rather than point estimates of diet composition.	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.