Were such things here as we do speak about? Or have we eaten on the insane root that takes the reason prisoner?

Food Web -> Parameters The GM Parametrizer allows to reproduce the generalized models of food webs I use in my research.
Specifically, it was written as a hands-on supplement to the paper on Perturbations of complex systems.

In the paper, we use generalized models of food webs to find important parts of a complex network with regard to the effects of a perturbation.
The GMParameterizer is a simple implementation of the algorithm creating these food webs in Python.

The GM Parameterizer (a) takes either a real-world food web topology or can generate a (niche) model food web topology, then (b) parameterizes this topology either with a simple example parameterization, randomly as for our simulations or with a user-defined parameterization, and finally (c) computes the resulting generalized model Jacobian matrix, indicating the stability of the obtained system. This Jacobian matrix can then (for example) be used in the program CIP to evaluate perturbation effects in the food web.

An example and more detailed readme file are included in the download.

(C) BY H. AUFDERHEIDE
THE CODE IS DISTRIBUTED AS-IS AND YOU USE IT AT YOUR OWN RISK
This work is licensed under the Creative Commons Attribution-NonCommercial 3.0 License.

Download GMParametrizer

 

Illustration of a Food Web with key species

CIP supplements my paper on Perturbations of complex systems published in Proceedings B.

In the paper, we develop a method to find important parts of a complex network with regard to the effects of perturbations, such as a new species invading an ecosystem. The CIP-Program is a simple implementation of this method in python.

CIP takes a Jacobian matrix describing the interactions between the elements of a network.
From this Jacobian matrix, it calculates
- The sensitivity of each element to perturbations (see paper for details).
- The influence of each element through perturbations (see paper for details).
- The response to a perturbation (if a specific perturbation is provided).

An example is included in the download.

(C) BY H. AUFDERHEIDE
THE SCRIPT IS DISTRIBUTED AS-IS AND YOU USE IT AT YOUR OWN RISK
This work is licensed under the Creative Commons Attribution-NonCommercial 3.0 License.

The zip-Archive includes a detailed Readme.txt.

Download CIP