steps (version 1.0.0)

mortality: Directly affect populations

Description

This function modifies a population by a mortality spatial layer included in a steps landscape object. The mortality layer consists of values from 0???1 and modifies the population by multiplying the population of a cell by the value of the corresponding cell in a mortality layer. For example, a cell with ten individuals before the mortality function is applied, and corresponding mortality layer cell with a value of 0.2, would have two individuals remaining after modification. Note, rounding also occurs after modification using a ceiling method (i.e the largest whole integer is retained).

Usage

mortality(mortality_layer, stages = NULL)

Arguments

mortality_layer

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

stages

which life-stages are modified - default is all

Examples

# NOT RUN {
# Modify populations in all life-stages with fire intensity.

# }
# NOT RUN {
fire_mortal <- mortality(mortality_layer = "fire", stages = NULL)

ls <- landscape(population = egk_pop,
                suitability = egk_hab,
                carrying_capacity = egk_k,
                "fire" = egk_fire)

pd <- population_dynamics(change = growth(egk_mat), modification = fire_mortal)

simulation(landscape = ls, population_dynamics = pd, habitat_dynamics = NULL, timesteps = 20)
# }