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.
disturbance(disturbance_layers, effect_time = 1)
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)
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.
# 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)
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