A PresenceAbsence object or an SpatialPolygonsDataFrame.
species_name
Species names in the same order as in the
SpatialPolygonsDataFrame (only needed if x is a SpatialPolygonsDataFrame).
coordinates
"geographical" or "planar". Indicate wheter the shapefile
has geographical or planar coordinates(only needed if x is a
SpatialPolygonsDataFrame).
units
"cell" or "squaremeter". Indicate if the size units wanted are
in number of cells occupied or in square meters(only needed if x is a
PresenceAbsence object).
Value
The result is a matrix with the range size of each species.
If the range size accounts for the earth curvature (Yes or No) or its size unit
may differ for each argument combination: