Description Usage Arguments Value Examples
A closed population function that calculates the length of time of the transient period after MPA implementation for a deterministic model This function calculates the ratio change in a fished poulation after a marine protected area is implemented assuming closed population method is from White et al. 2013 'transient responses of fished populations to marine reserve establishment published in conservation letters assumes a lambda of 1.0 in the MPA
1 | closedpop_time(tf, maxage, Lmat, Lfish, M, Fi, Linf, k, a0, pW, qW)
|
tf |
the number of time step to run the population |
maxage |
max age of the species ie. number of age classes |
Lmat |
length at maturity |
M |
the natural mortality rate, if unknown generally use 0.2 |
Fi |
the fishing mortality rate, F, find in stock assessment if don't have more localized estimate |
Linf |
asymptotic growth rate used in von-Bertallanfy growth equation, can find on fishbase |
k |
von-bertallanfy growth parameter estimate |
a0 |
the age at length 0 used in the von-Bertallanfy growth equation |
pW |
weight length relationship parameter, same as a on fishbase.org but need to divide by 1000 to get in kg not grams |
qW |
weight length relationship parameter, same as b on fishbase.org |
transient_length is the length of time of the transient duration for the closed population
1 2 | closedpop_time(M=0.2,Fi=0.14,Lfish=25,Linf=37.8,k=0.13,a0=-0.7,maxage=25,pW=9.37e-06,qW=3.172)
closed_time()
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