lhRef: Reference points based on life histories

In flr/FLife: Methods for Modelling Life History Traits

Reference points based on life histories

Description

lhRef calculates a variety of reference points i.e. population growth rate at small population sizs (r), and at B~MSY (rc), ratio of virgin biomass to B~MSY (sk), life time reproductive output (srp0) and reproductive output at B~MSY (sprmsy)

Usage

lhRef(
  params,
  m = function(length, params) exp(0.55) * (length^-1.61) %*% (params["linf"]^1.44)
    %*% params["k"],
  sr = "bevholt",
  range = c(min = 0, max = 40, minfbar = 1, maxfbar = 40, plusgroup = 40),
  what = c("r", "rc", "msy", "lopt", "sk", "spr0", "sprmsy"),
  msy = "msy"
)

Arguments

params	FLPar
m	function for natural mortality
sr	character with stock recruitment relationship, e.g. "bevholt","ricker",...
range	ages used i.e. c(min=0,max=40,minfbar=1,maxfbar=40,plusgroup=40)
what	quantities to calculate "r","lopt","rc","sk","spr0","sprmsy"
msy	character with "msy", "f0.1", ...

Value

object of class FLPar with reference points, i.e r, rc, sk, lopt,

See Also

lhPar, lhEql

Examples

## Not run: 
library(FLBRP)
params=FLPar(linf=100,t0=0,k=.4)
params=lhPar(params)
lhRef(params)

## End(Not run)

flr/FLife documentation built on March 29, 2024, 5:50 p.m.