getUREncounter: Get encounter rate for unstructured resource

In gustavdelius/mizerUR: Unstructured Resources for Mizer

Description

Calculates the rate E_i(w) at which a predator of species i and weight w encounters resources (grams/year).

Usage

getUREncounter(
  params,
  n = params@initial_n,
  n_pp = params@initial_n_pp,
  n_other = params@initial_n_other,
  ...
)

Arguments

params	A MizerParams object
n	A matrix of species abundances (species x size)
n_pp	A vector of the plankton abundance by size
n_other	A list of abundances of other dynamical components

Value

A two dimensional array (predator species x predator size)

Resource encounter

In addition to the contribution from predation on fish prey and plankton, the food encounter rate may have a contribution from unstructured resource components. This takes the form

E_{u.i} = ∑_d ρ_{id}(w) B_d.

where B_d is the biomass of the d-th unstructured resource component and ρ_{id}(w) is a parameter that therefore determines the rate at which a predator of species i and size w encounters biomass from the d-th unstructured resource component. This is set with setResourceEncounter.

The encounter rate is multiplied by 1-f_0 to obtain the consumption rate, where f_0 is the feeding level calculated with getFeedingLevel. This is used by the project function for performing simulations.

The function returns values also for sizes outside the size-range of the species. These values should not be used, as they are meaningless.

Examples

## Not run: 
# TODO

## End(Not run)

gustavdelius/mizerUR documentation built on June 24, 2020, 6:28 p.m.