View source: R/growth_transition_functions-class.R

competition_density | R Documentation |

Adjusts the life-stage transition matrix in each cell based on the carrying capacity in the cell and
a density dependence function - default is Beverton-Holt. The user may specify which life-stages are
affected by density dependence. If `R_max`

is not provided this is calculated from the local cell-based
transition matrices internally. By providing initial stable age distribution values, performance can be
increased as the function internally calculates these values through optimisation.

competition_density( stages = NULL, mask = NULL, R_max = NULL, stable_age = NULL )

`stages` |
which life-stages contribute to density dependence - default is all |

`mask` |
a matrix of boolean values (TRUE/FALSE), equal in dimensions to the life-stage transition matrix and specifying which vital rates (i.e. survival and fecundity) are to be modified by the function |

`R_max` |
optional value of maximum growth rate (lambda) if known |

`stable_age` |
optional vector of stable age distributions if known |

# Vital rates (survival and fecundity) modified based on approach to carrying capacity # by the 2nd and 3rd life stages. ## Not run: mod_fun <- competition_density(stages = c(2, 3)) ls <- landscape(population = egk_pop, suitability = NULL, carrying_capacity = egk_k) pd <- population_dynamics(change = growth(egk_mat, transition_function = mod_fun)) simulation(landscape = ls, population_dynamics = pd, habitat_dynamics = NULL, timesteps = 20) ## End(Not run)

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