Figure 8. Thresholds of the aggregate.

(a) Distribution of cluster size at 5 hours for three different initial populations: 2 earthworms, 5 earthworms, and 9 earthworms, with the probability of joining μ = 0.02 min⁻¹ and that of leaving Q(N) = N^−2.6/6.25 min⁻¹. (b) Mean cluster size at 5 hours as a function of the initial size with the probability of joining (μ) = 0.02 min⁻¹ and that of leaving Q(N) = N^−2.6/6.25 min⁻¹.