Population Dynamics - the Bold Approach
Readers of my book and my blog are well aware of a critical attitude towards traditional population modelling, in particular because individual memory effects on long distance movement with a potential for returns are not accounted for. Thus, I have developed an alternative approach, the "Zoomer model", which has been presented in various posts. In this post you find short videos of simulations where the classical and the alternative approach are contrasted under very basic conditions.
In the videos I illustrate the profound difference between memory-less, Markov-compliant, scale-specific dynamics (the Paradigm) and scale-free, memory-influenced dynamics (the Zoomer model). These two classes of dynamics are exemplified to show the spatial redistribution effect on conspecific attraction, which is presented in two variants;
- population re-distribution where the emerging pattern primarily is driven by such "intraspecific cohesion", and
- the population kinetics is at some point during each series switching from intrinsic cohesion alone to becoming additionally influenced by some extra rate of local, non-directed and thus more erratic movement; i.e., diffusion-like. This illustrates that animal space use and re-distribution is influenced by many environmental factors; not only the distribution of conspecifics. The balance between these forces, here simplified by intra-specific cohesion and diffusion*), will determine the overall population kinetics and spatial dispersion.