box_pred_kernel: Box predation kernel

In mizer: Dynamic Multi-Species Size Spectrum Modelling

Box predation kernel

Description

A predation kernel where the predator/prey mass ratio is uniformly distributed on an interval.

Usage

box_pred_kernel(ppmr, ppmr_min, ppmr_max)

Arguments

ppmr	A vector of predator/prey size ratios
ppmr_min	Minimum predator/prey mass ratio
ppmr_max	Maximum predator/prey mass ratio

Details

Writing the predator mass as w and the prey mass as w_p, the feeding kernel is 1 if w/w_p is between ppmr_min and ppmr_max and zero otherwise. The parameters need to be given in the species parameter dataframe in the columns ppmr_min and ppmr_max.

Value

A vector giving the value of the predation kernel at each of the predator/prey mass ratios in the ppmr argument.

See Also

setPredKernel()

Other predation kernel: lognormal_pred_kernel(), power_law_pred_kernel(), truncated_lognormal_pred_kernel()

Examples

params <- NS_params
# Set all required paramters before changing kernel type
species_params(params)$ppmr_max <- 4000
species_params(params)$ppmr_min <- 200
species_params(params)$pred_kernel_type <- "box"
plot(w_full(params), getPredKernel(params)["Cod", 10, ], type="l", log="x")

mizer documentation built on Oct. 17, 2024, 9:07 a.m.