Density Dependence Triggers Runaway Selection of Reduced Senescence
Figure 2
Graphs of R(x) as Functions of the Senescence Variable x for Various Initial Recruitment Functions b0(x)
Graphs of b0(x) are shown in the inset panels.
(A) As in Equation 14 with C = 1 and D = μ. In this case, R(x) is monotonically decreasing in x, and the evolutionary optimum is at the nonsenescent state x = 0.
(B) As in Equation 14 with C = 8 and D = μ. In this case, R(x) has a minimum at a positive value of x.
(C) As in Equation 14 with C = 20 and D = μ. In this case, R(x) is monotonically increasing, and the evolutionary optimum is the most extreme compressed life history, x = ∞.
(D) A recruitment function not in the class of Equation 14: . In all cases, ω0 = 1, μ = μ0 + g = 0.1, and R0 = ω0/μ, R∞ = κCω0 with
.