Instabilities and dissipative structures
In the previous chapter, we mentioned a traveling population front as the simplest theoretical example of a spatiotemporal structure. A front separates space into two regions with diﬀerent properties, e.g., quantiﬁed by high and low values of population density, respectively. In each of these regions the population is distributed homogeneously. Therefore, the system actually exhibits spatial heterogeneity (in terms of large gradients of the population density) only within a narrow crossover region.