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
the 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
encounter rate of predator and prey (allows conversion with respect to d).
f
death rate of the predator population.
g
recycling parameter.
inputs
time series specifying external delivery of the 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 with the integration method.

See Also

sim, parms, init, times.

Examples

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

[Package simecol version 0.3-11 Index]