Function swifco_rs::systems::dispersal::default_male_dispersal

fn default_male_dispersal(
    dispersal_probability: Option<f64>, 
    dispersal_ticks: Option<u32>, 
    dispersal_radius: Option<f32>, 
    distance_bias: Option<f32>, 
    dispersal_start: Option<u32>, 
    dispersal_duration: Option<u32>
) -> SystemWrapper

default_male_dispersal( dispersal_probability=0.5, dispersal_ticks=2, dispersal_radius=8.0, distance_bias=0.5, dispersal_start=20, dispersal_duration=10, )

Default male dispersal

Male dispersal is performed in weeks 20 to 30 of the year only (i.e., mid-June to the end of July). Uniformly distributed over the weeks of the dispersal period sub-adult males start to disperse. During dispersal, a male does move from cell to cell along connecting edges which are not blocked or lead to impassible cells.

Each week, cells within the radius given by dispersal_radius are considered. The boar moves to the cell with the highest habitat value among the accessible cells ([Pe_er_2013], [Graf_2007], [Jeltsch_1997]). Additionally, cells further away are less likely than cells close by with an exponental weighting determined by the distance_bias exponent. [Prevot_2013]

Parameters:

dispersal_probability - individual dispersal probability

dispersal_ticks - ticks for which an animal is on the move

dispersal_radius - maximum dispersal radius in grid cells (default value based on [Truv__2003]_)

distance_bias - factor to exponetially bias dispersal against more distance cells

dispersal_start - start of the dispersal season, as week of year

dispersal_duration - duration of the dispersal season, in weeks