Fig 6. A selection of plots showing the effect of food distribution on gregarisation and locust group formation with symmetric parameters.
In these simulations ρamb = 1.2, κ = 0.09, and FM = 1.5 with ω = 7.5%, 10%, and 12.5%, as well as with no food present (labelled ω = 0%). In the plots, blue is solitarious, red is gregarious, and green is food. If the food source is too narrow (ω = 7.5%, t = 3) there is an attempt at group formation but the gregarious mass is too small and a large portion remains within the food source, thus the group does not persist. If the food is too wide (ω = 12.5%) the gregarious locusts simply cluster in the center of the food and do not attempt group formation. Finally, if the food width is optimal (ω = 10%) there is a successful group formed, this is seen as clump or aggregation of gregarious locusts in the final plot.