npr: Calculate numbers per recruit

In mcsiple/mmrefpoints: Project Marine Mammal Populations and Calculate Reference Points

Calculate numbers per recruit

Description

Calculate numbers-per-recruit as a function of the bycatch rate assuming that 1+ animals are subject to bycatch E.

Usage

npr(S0, S1plus, nages, AgeMat, E = 0)

Arguments

S0	Calf/pup survival, a numeric value between 0 and 1
S1plus	Adult survival, a numeric value between 0 and 1
nages	Plus group age in years
AgeMat	Age at maturity in years (must be equal to or less than nages)
E	Bycatch mortality rate, a numeric value between 0 and 1

Value

A list of numbers per recruit (npr), 1+ numbers per recruit (P1r), and numbers at age per recruit (nvec)

Examples

(unpr <- npr(S0 = 0.9, S1plus = 0.9, 
AgeMat = 11, nages = 13, E = 0)) # unfished nums per recruit
(nprf <- npr(S0 = 0.9, S1plus = 0.9, 
AgeMat = 11, nages = 13, E = 0.8)) # nums per recruit at bycatch rate E

mcsiple/mmrefpoints documentation built on June 17, 2022, 8:41 p.m.