calc_sizepref_suitability: Calculates size preference and suitabilities

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

Description

Size preferences for prey species by predator species are modelld with a lognormal distribution. The bundled data use a parameterization that gives a maximal preference to prey that are approximately 1/33rd the weight of the predator.

Usage

calc_sizepref_suitability(nSize, nSpecies, mBound, spMu, spSigma, wgt,
  scLinf, FW)

Arguments

nSize	Number of size class intervals species can grow through
nSpecies	Number of species in the model
mBound	Mid point of each size class interval
spMu	Mean of log normal distribution. See rochet_GB_modelSetup
spSigma	Standard deviation of the log normal distribution. See rochet_GB_modelSetup
wgt	Weight of species at the mid point of each size class (Units: grams). See calc_ration
scLinf	The size class at which each species reaches L_inf (maximum length). See calc_ration
FW	Food web represented as a binary matrix. Predator (columns) and prey (rows). See rochet_GB_foodweb

Value

A list is returned

sizePref	3D array of prey size preference for predator size.
suitability	3D array of prey size suitability for predator size. Suitability is calculated as (sizePref*Food Web). These values are then standardized across all prey species/size classes for a given predator in a size class

Notes on 3D arrays

The 3D arrays contain prey size class in the rows, prey species in the columns (nSizeClass x nSpecies). The 1st dimension represents a predator/size class comnination. For example slice [1,,] represents the preference of predator species 1 in size class 1 to all prey species /size class combinations. The 1st dimension has length equal to nSpecies*nsizeClass. However many entries are zero determined by each species Linf

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.