Dispersion by animals
mec_zoospread.RdOptional Module. Simulates dispersion by domestic and wild animal movement
Usage
mec_zoospread(
aoi,
poi,
mec_surface,
n_animals = 5,
n_steps = 100,
pixel_size = 1,
n_iter = 10,
dist = 5,
quiet = FALSE
)Arguments
- aoi
a
sfpolygon representing the area of interest- poi
a single-point
sfobject denoting the point of interest to run the simulations- mec_surface
the result of mec_surfacewater
- n_animals
number of animals
- n_steps
number of steps of each animal for the simulations
- pixel_size
size of the movement in pixels
- n_iter
number of random iterations for each animal
- dist
filter trajectories less than the specified meters away of the POI (susceptible to inoculum)
- quiet
if
TRUE, suppress any message or progress bar
Details
This function models animal movement as a series of straight-line steps towards resource sources, while avoiding exclusion areas and staying within defined boundaries. It randomly assigns initial animal positions and calculates movement direction towards resources. The direction is normalized and randomized using a rotation matrix. Animal trajectories are stored in vector format, and those crossing the foci are identified for further analysis. Simulation parameters, such as the number of animals and steps, are set at the start.
References
Kliejunas, J.T., Ko, W.H., 1976. Dispersal of Phytophthora cinnamomi on the island of Hawaii. Phytopathology 66, 457–460.
Li, A.Y., Williams, N., Fenwick, S.G., Hardy, G.E.St.J., Adams, P.J., 2014b. Potential for dissemination of Phytophthora cinnamomi by feral pigs via ingestion of infected plant material. Biol. Invasions 16, 765–774. doi:10.1007/s10530-013-0535-7
Cardillo, E., Acedo, A., Abad, E., 2018. Topographic effects on dispersal patterns of Phytophthora cinnamomi at a stand scale in a Spanish heathland. PloS One 13, e0195060.