calc_M1: Calculates M1 mortality

In NOAA-EDAB/LeMANS: length-based multispecies analysis by numerical simulation (LeMANS)

Description

calculates other sources of natural mortality other than predation. It is assumed that M1 mortality follows a beta distribution and that in general the small and large size classses suffer the greatest mortality.

Usage

calc_M1(nSize, nSpecies, lBound, mBound, alphaM1, betaM1, cM1, scLinfMat,
  scLinf, phiMin, parameterValues)

Arguments

nSize	Number of size class intervals species can grow through
nSpecies	Number of species in the model
lBound	Lower bound of each size class interval
mBound	Mid point of each size class interval
alphaM1	Shape parameter (alpha) of the beta distribution
betaM1	Shape parameter (beta) of the beta distribution
cM1	Scales the pdf ??????
scLinf	The size class at which each species reaches L_inf (maximum length)
phiMin	Model timestep (years). See calc_phi
parameterValues	Matrix of species specific parameters. See rochet_GB_parameterValues

Value

A matrix is returned

M1	A matrix (size nSize x nSpecies) of M1 (natural mortality) values. Note: M1 = 0 for size classes in which a species does not reach/grow in to.

References

Hall et al. (2006). A length-based multispecies model for evaluating community responses to fishing. Can. J. Fish. Aquat. Sci. 63:1344-1359.

Rochet et al. (2011). Does selective fishing conserve community biodiversity? Prediction from a length-based multispecies model. Can. J. Fish. Aquat. Sci. 68:469-486

NOAA-EDAB/LeMANS documentation built on Feb. 7, 2021, 11:01 p.m.