Parameter drift stabilizes long-range extinction forecasts

 
This item is provided by the institution :
University of Ioannina
Repository :
Repository of UOI Olympias
see the original item page
in the repository's web site and access all digital files if the item*
share



2003 (EN)
Parameter drift stabilizes long-range extinction forecasts (EN)

Halley, J. M. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών (EL)
Halley, J. M. (EN)

Estimates of the reliability of population viability analysis (PVA), accounting for uncertainties in model parameters, often arrive at confidence intervals for extinction probability so wide as to be almost meaningless. This lack of precision is a consequence of extreme sensitivity to average linear growth rate, when predicting to a distant time horizon. Longer-term trends or drift in parameter values (a form of 'reddened' environmental variability) will also affect the accuracy of such forecasts. This letter reports how, contrary to intuition, introducing such a component of variability may improve the precision of extinction forecasts. The paradoxical result arises because the dependence of extinction probability on growth rate is weakened, and shifted onto other parameters (e.g. diffusion strength) where dependence is less sensitive. This offers hope that, with reasonable knowledge of environmental stochasticity, it may still be meaningful to carry out longer range PVAs. (EN)

environmental stochasticity (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Ecol Lett (EN)

English

2003

<Go to ISI>://000182259400004



*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)