disturbance {steps}

Disturbance

Description

Modifies the landscape by multiplying habitat suitability values by a sum of previous disturbances. Since disturbances can act in a single timestep, or have lasting effects, the user can specify an 'effect time' of disturbances.

Usage

disturbance(disturbance_layers, effect_time = 1)

Arguments

disturbance_layers

the name of spatial layer(s) in the landscape object with disturbances used to alter the habitat object for each timestep (number of layers must match the intended timesteps)

effect_time

the number of timesteps that the disturbance layer will act on the habitat object (e.g. '3' will combine the effects of previous two timesteps to increase the overall effect) - the default is 1.

Examples

# Road building (stored in the landscape object and called "roads") acts on the landscape
# each year.

## Not run: 
road_effect <- disturbance(disturbance_layers = "roads", effect_time = 1)

ls <- landscape(population = egk_pop, suitability = egk_hab, "roads" = egk_road)

pd <- population_dynamics(change = growth(egk_mat))

sim <- simulation(landscape = ls,
           population_dynamics = pd,
           habitat_dynamics = list(road_effect),
           timesteps = 20)
           
plot(sim, object = "suitability", type = "raster", timesteps = 1:9)

## End(Not run)