Sheperd function to calculate density-dependent reproduction rate

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

Value

Vector of density-dependent reproduction rates.

Details

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

See also

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