SheperdRDD: Sheperd function to calculate density-dependent reproduction...

In drfinlayscott/mizer: Dynamic Multi-Species Size Spectrum Modelling

Sheperd function to calculate density-dependent reproduction rate

Description

Takes the density-independent rates R_{di} of egg production and returns reduced, density-dependent rates R_{dd} given as

R_{dd} = \frac{R_{di}}{1+(b\ R_{di})^c}

Usage

SheperdRDD(rdi, species_params, ...)

Arguments

rdi	Vector of density-independent reproduction rates R_{di} for all species.
species_params	A species parameter dataframe. Must contain columns sheperd_b and sheperd_c with the parameters b and c.
...	Unused

Details

With b = 1/R_{max} and c = 1 this reduces to the Beverton-Holt reproduction rate, see BevertonHoltRDD().

Value

Vector of density-dependent reproduction rates.

See Also

Other functions calculating density-dependent reproduction rate: BevertonHoltRDD(), RickerRDD(), constantEggRDI(), constantRDD(), noRDD()

drfinlayscott/mizer documentation built on April 13, 2024, 9:16 a.m.