calc_Smsy_Ricker: Ricker reference points

In salmonMSE: Management Strategy Evaluation for Salmon Species

Ricker reference points

Description

Compute reference points (Umsy, Smsy, and Sgen) from Ricker stock-recruit function based on Scheuerell (2016).

Usage

calc_Smsy_Ricker(loga, b)

calc_Umsy_Ricker(loga)

calc_Sgen_Ricker(loga, b)

Arguments

loga	Numeric, alpha parameter (returns per spawner) in the Ricker function: R=S\exp(\log(a)-bS) where S is the number of spawners and R is the return
b	Numeric, beta parameter

Value

All three functions return a numeric

References

Scheuerell, M.D. 2016. An explicit solution for calculating optimum spawning stock size from Ricker’s stock recruitment model. PeerJ 4:e1623. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.7717/peerj.1623")}

See Also

calc_ref()

Examples

a <- 3
Smax <- 100
b <- 1/Smax

calc_Smsy_Ricker(log(a), b)
calc_Umsy_Ricker(log(a))
calc_Sgen_Ricker(log(a), b)

salmonMSE documentation built on Aug. 20, 2026, 5:09 p.m.