Summarize 'metapopulation' class objects

This function summarizes a metapopulation class object.

Usage

summary_metapopulation(object)

Arguments

object: Object of class metapopulation

Details

This function can be used to retrieve basic information on the objects of class 'metapopulation'.

Value

Returns a data frame with the following information on a metapopulation class object:

landscape area (hectares): Landscape mosaic area, in hectares
number of patches: Number of patches in the landscape
mean patch area (hectares): Mean patch area, in hectares
SD patch area: SD of the patch area
mean distance amongst patches (meters): Mean inter-patch distance, in meters
minimum distance amongst patches (meters): Minimum inter-patch distance, in meters
species occurrence - snapshot: Occupation data of the focal species, numbered from 1 to the number of snapshots

Author

Frederico Mestre and Fernando Canovas

Note

The minimum distance between patches is different from that given in the object of class 'landscape', in the slot 'minimum.distance'. This is because this output is computed from the landscape structure and the one in the 'landscape' object was the parameter used to built the landscape. The minimum inter-patch distance given as a parameter in the function rland.graph will consider distance between patch centroids. The minimum inter-patch distance returned here considers the edge-to-edge distance, so this might be smaller that the parameter of rland.graph. In order to see the difference between centroid-to-centroid and edge-to-edge inter-patch distance compute both using the matrix.graph function (methods are 'centr_distance' and 'euc_distance', respectively).

Examples


data(occ.landscape)
data(occ.landscape2)

summary_metapopulation(object=occ.landscape)
#>                                             Value
#> landscape area (hectares)                 100.000
#> number of patches                          60.000
#> mean patch area (hectares)                  0.061
#> SD patch area                               0.041
#> mean distance amongst patches (meters)    528.345
#> minimum distance amongst patches (meters)  51.780
#> species occurrence - snapshot 1            50.000

#                                            Value
#landscape area (hectares)                 100.000
#number of patches                          60.000
#mean patch area (hectares)                  0.061
#SD patch area                               0.041
#mean distance amongst patches (meters)    528.345
#minimum distance amongst patches (meters)  51.780
#species occurrence - snapshot 1            50.000


summary_metapopulation(object=occ.landscape2)
#>                                             Value
#> landscape area (hectares)                 100.000
#> number of patches                          60.000
#> mean patch area (hectares)                  0.069
#> SD patch area                               0.039
#> mean distance amongst patches (meters)    521.717
#> minimum distance amongst patches (meters)  45.905
#> species occurrence - snapshot 1            50.000
#> species occurrence - snapshot 2            58.333
#> species occurrence - snapshot 3            61.667
#> species occurrence - snapshot 4            61.667
#> species occurrence - snapshot 5            58.333
#> species occurrence - snapshot 6            60.000
#> species occurrence - snapshot 7            70.000
#> species occurrence - snapshot 8            68.333
#> species occurrence - snapshot 9            68.333
#> species occurrence - snapshot 10           56.667

#                                            Value
#landscape area (hectares)                 100.000
#number of patches                          60.000
#mean patch area (hectares)                  0.069
#SD patch area                               0.039
#mean distance amongst patches (meters)    521.717
#minimum distance amongst patches (meters)  45.905
#species occurrence - snapshot 1            50.000
#species occurrence - snapshot 2            58.333
#species occurrence - snapshot 3            61.667
#species occurrence - snapshot 4            61.667
#species occurrence - snapshot 5            58.333
#species occurrence - snapshot 6            60.000
#species occurrence - snapshot 7            70.000
#species occurrence - snapshot 8            68.333
#species occurrence - snapshot 9            68.333
#species occurrence - snapshot 10           56.667