Converts from capacity/productivity parameters to alpha/beta stock-recruit parameters where productivity is in terms of smolts per spawner and alpha is terms of smolts per egg.
Usage
calc_SRRpars(p, capacity, f = 1, p_female = 1, type = c("BH", "Ricker"))Arguments
- p
Numeric, the productivity parameter that sets the maximum survival as the initial abundance approaches zero
- capacity
Numeric, the capacity parameter that set the maximum survivors
- f
Fecundity, the spawning output per mature female
- p_female
The proportion of females per spawner
- type
Character, the functional form of the stock-recruit relationship
Details
$$\alpha = \dfrac{P}{f \times p_{female}}$$
For the Beverton-Holt stock recruit relationship: $$\beta = \dfrac{\alpha}{C}$$
For the Ricker stock recruit relationship: $$\beta = \dfrac{\alpha}{Ce}$$, \(e\) is Euler's number.