In this page you will find a description of the models developed by members of the METHOD IFG, the reference to the original publication, and information to contact the author(s). Some models are also available for download.


Author: Jesus A. Martín-González


Original publication: Martín-González, J.A., Mateos, A., Rodríguez-Gómez, G., Rodríguez, J., 2016. A parametrical model to describe a stable and stationary age structure for fossil populations. Quaternary International 413, B, 69-77.

Stable and stationary population

This model is intended to test whether an observed mortality profile might correspond to the natural mortality pattern of a stable population.

A parametric family of models based on the Weibull model is proposed to describe the age structure of a fossil population. This descriptive approach is combined with a population dynamics model based on the Leslie matrix. The stability and sustainability conditions are algebraically stated to provide an equilibrium equation for any species.

The model parameters for a sustainable population are determined via numerical methods. These values represent the survival and mortality profiles for a sustainable population and are comparable between different populations.