Table 2 Parameter dependence of the thresholds x̄, \(x = x ( \bar{x} )\), and the amount of harvesting \(\bar{\xi } = \bar{x} - x\). In this table, the notations “+” and “−” mean means increase and decrease of x̄, x, or ξ̄ with respect to each parameter, respectively
Parameter | Smallest value | Largest value | x̄ | \(\underline{x}\) | ξ̄ |
|---|---|---|---|---|---|
μ | 0.2 | 0.8 | − | − | − |
σ | 0.1 | 0.7 | + | + | + |
δ | 1.5 | 3.0 | + | + | + |
r | 0.003 | 0.007 | − | − | − |
R | 0.1 | 5.0 | + | + | + |
\(k_{0}\) | 0.01 | 0.25 | + | − | + |
\(k_{1}\) | 0.01 | 0.20 | + | + | + |
a | 0.1 | 0.9 | − | − | − |
b | 0.5 | 1.0 | − | − | − |