Getting our hands dirty :
Homogeneous environment : Rodent agents move in a homogeneous landscape. This is a reference situation for testing homogeneous moves. Note this situation correspond to non spatial situation underlying the standard models and statistics (simulation parameters: radius of the rodents' perception circle 5, max distance covered in one step: 10)
Heterogeneous environment: Rodent agents are imposed to prefer boundaries (hedges for shelter) than fields. Given their moves, the fate of agent changes and the probability of encounters between e.g., males and females is modified. Q: how does heterogeneity affect the genetic evolution of the community ? (same simulation parameters)
Offspring generation: each time a male meets a female, they produce a F1 child. at the time of the report, F1 generation occurs at each encounter, hence the rabbit like copulation and the unrealistic proliferation.
There is a significant influence of the habitat heterogeneity on the encounter opportunities
Next to come : the mechanisms to implement next within this particular aspect concern :
- reproduction conditions : age of sexual maturity, time of year for reproduction, pregnancy duration, nb litters per year, nb child per litter,
- interaction process: attraction - repulsion, choice of interaction (fight, reproduction, escape, etc.)
Real case perspective: the background is a GoogleEarth picture of downtown Kedougou (Senegal, West Africa) rodents move depending on the affinity they have to the current biotope (dark is better in this case). The great heterogeneity make encounter dependent on many factors (rodents' sensing notably). For now encounters are only fortuitous. They lead to offspring generation in the same way as the previous simulation.
Modelling is realized in Java using the Repast Simphony platform.
J. Le Fur, 13 jan. 2011