Figure 1.

Individual stress-level (OSL) dynamics. (a) No neighbour interaction (neighbourhood relevance NR=0); (b) NR=0.2. The upper and lower curves present the dynamics of the individual with the highest (300) and lowest (100) initial stress levels, respectively. The other 10 trajectories shown are from randomly selected birds. Note that when females achieve a stress level of 10 or less they start incubating (at the end of each individual trajectory), and thus the stress level becomes 0 the following day.