MetaLandSim (version 0.2)

species.graph: Simulate landscape occupation

Description

Given a set of parameters, this function allows to simulate the occupation of an empty landscape, class "metapopulation".

Usage

species.graph(rl, method = 'percentage', parm, nsew = 'none', a_min, plotG = TRUE)

Arguments

rl

Object of class "landscape".

method

One of the following (default 'percentage'): click - individually select the patches with occurrence of the species by clicking on the map. Use only for individual landscape simulations. percentage - percentage

parm

Parameter to specify the species occurrence - either percentage of occupied patches or number of occupied patches, depending on the method chosen.

nsew

'N', 'S', 'E', 'W' or none - point of entry of the species in the landscape. By default set to "none".

a_min

Minimum patch area of the patches to be occupied (in hectares).

plotG

TRUE/FALSE, to show graphic output.

Value

• Returns a list, with the following elements:
  • mapsize - Landscape mosaic side length, in meters.
  • minimum.distance - Minimum distance between patches centroids, in meters.
  • mean.area - Mean patch area in hectares.
  • SD.area - Standard deviation of patches area.
  • number.patches - Total number of patches.
  • dispersal - Species mean dispersal ability, in meters.
  • distance.to.neighbours - Data frame with pairwise distance between patches, in meters.
  • nodes.characteristics - Data frame with patch (node) information (coordinates, area, radius, cluster, distance to nearest neighbour, ID and species).
  An additional field, colour, has only graphical purposes.

See Also

rland.graph, simulate_graph, remove.species

Examples

data(rland)

##Creating a 50\% occupation in an empty landscape (using the 'landscape' dataset):

sp1 <- species.graph(rl=rland, method='percentage', parm=50, nsew='none', a_min=0, plotG=TRUE)