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- W2170443214 abstract "Abstract: Conventional population viability analysis (PVA) is often impractical because data are scarce for many threatened species. For this reason, simple count‐based models are being advocated. The simplest of these models requires nothing more than a time series of abundance estimates, from which variance and autocorrelation in growth rate are estimated and predictions of population persistence are generated. What remains unclear, however, is how many years of data are needed to generate reliable estimates of these parameters and hence reliable predictions of persistence. By analyzing published and simulated time series, we show that several decades of data are needed. Predictions based on short time series were very unreliable mainly because limited data yielded biased, unreliable estimates of variance in growth rate, especially when growth rate was strongly autocorrelated. More optimistically, our results suggest that count‐based PVA is sometimes useful for relative risk assessment (i.e., for ranking populations by extinction risk), even when time series are only a decade long. However, some conditions consistently lead to backward rankings. We explored the limited conditions under which simple count‐based PVA may be useful for relative risk assessment." @default.
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- W2170443214 date "2004-09-28" @default.
- W2170443214 modified "2023-10-15" @default.
- W2170443214 title "Reliability of Absolute and Relative Predictions of Population Persistence Based on Time Series" @default.
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- W2170443214 doi "https://doi.org/10.1111/j.1523-1739.2004.00285.x" @default.
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