Figure 2.

Range of attraction vizualisation. The area of attraction for the three models. It is assumed that each trap catches a number of Culicoides proportional to the area within the range of attraction (white lines). The plots represents modeled fields of 300 by 300 meters with one transect of traps from Figure 1. The colors (color-key on top) indicate which trap a Culicoides in this area will end up in, with trap numbers corresponding to numbers in Figure 5. The white lines indicate different cutoff points in range of attraction (light intensity). These plots thereby represent the functions T^k(x,y), where the white lines in each plot indicate the three cutoffs, I_C, also indicated in Figure 5, which corresponds to a range of attraction of 5 and 50 meters and the best fit. Model III is presented with σ=10. The left column is setup A, the right column is setup B. In model I (top) Culicoides always fly to the nearest trap, in model II (middle) Culicoides fly towards the area of highest light intensity, and in model III (bottom) Culicoides fly towards what they perceive as the brightest light, as illustrated in Figure 3.