Extinction risk, coloured noise and the scaling of variance.

Extinction risk under coloured environmental noise

Confounding Environmental Colour and Distribution Shape Leads to Underestimation of Population Extinction Risk

The colour of environmental variability influences the size of population fluctuations when filtered through density dependent dynamics, driving extinction risk through dynamical resonance. Slow fluctuations (low frequencies) dominate in red environments, rapid fluctuations (high frequencies) in blue environments and white environments are purely random (no frequencies dominate). Two methods ar...

Interim Report IR - 02 - 56 Influence of Coloured Noise on the Extinction Risk in Structured Population Models

Interim Reports on work of the International Institute for Applied Systems Analysis receive only limited review. Views or opinions ex pressed herein do not necessarily represent those o f the Institute, its National Member Organizations, or ot her organizations supporting the work. Abstract We use simple models too compare extinctionn riskk among basic life history types when environmental nois...

Extinction Risk and the 1 f Noise Models

In order to predict extinction risk in the pres variability, fluctuating parameters may be rep stochastic models with different levels of varia the process of parameter estimation for three each other, and with autoregressive noise mo a model time-series (length, T) of populatio variance and the expected extinction risk for implication of assuming an incorrect noise m necessary to do so in term...

Extinction risk in periodically fluctuating environments

Periodically fluctuating environments occur in various ways in nature but have not, however, been studied in detail yet in the context of the color of environmental noise and extinction risk of populations. We use a stochastic model to simulate population dynamics with compensatory density regulation under four different patterns of periodically fluctuating environments. We found that extinctio...