lv3 {simecol}R Documentation

Lotka-Volterra-Type Model with Resource, Prey and Predator

Description

simecol example: predator prey-model with three equations: predator, prey and resource (e.g. nutriens, grassland).

Usage

data(lv3)

Format

A valid S4 object according to the odeModel specification. The object contains the following slots:

main
Lotka-Volterra equations for predator prey and resource
.
parms
Vector with named parameters of the model:
c
growth rate of the prey population,
d
encounter rate of predator and prey,
e
yield factor (allows conversion with respect to d),
f
death rate of the predator population,
g
recycling parameter.
inputs
Time series specifying external delivery of resource.
times
Simulation time and integration interval.
init
Vector with start values for s, p and k.
s
Resource (e.g. grassland or phosphorus).
p
Producer (prey).
k
Consumer (predator).
solver
Character string specifying the integration method.

See Also

simecol-package, sim, parms, init, times.

Examples

    data(lv3)
    plot(sim(lv3))
    solver(lv3) <- "lsoda"
    plot(sim(lv3))         # wrong! automatic time step overlooks internal inputs
    plot(sim(lv3, hmax=1)) # integration with correct maximum time step

[Package simecol version 0.5-5 Index]