The first 1600 time steps of a standard run of EcoSim. The food for prey is uniformly distributed. The prey are in multiple colors depending on their species and the predator are in white. Study of the effect of non uniform distribution of grass. In this video, the grass is distributed in concentric circles. The patterns of distribution of prey follow the distribution of grass. For all of these simulations, the artificial isolation mechanism due to the food distribution leads to an important increase in number of coexisting species. The first 1500 time steps of a run with a 'star' distribution of grass. Here the restriction of movement for the prey due to the distribution of food is too strong and they can not escape the predators enough to survive. The first 1500 time steps of a run with a distribution of grass in isolated islands. Even if the population stay mostly isolated we can observe from time to time, due to predation pressure, that some individuals cross the gaps between the islands. We study here the effect of adding numerous small random obstacles in the world. The obstacles reduce the possibility of movement and perception for the individuals. It leads to a decrease in gene flow among the population and a important and direct increase in the number of species emerging. The video present the first 1500 time steps. The obstacles are in blue. |