Compute subpopulations follwing the Circular buffer method (see reference)
Dataframe, coordinates in decimal degrees of one species, latitude in first colum,, longitude in second column
Numeric, radius of circles in kilometres
Circular buffer method of Rivers et al. 2010
Each unique occurrence is buffered with a circle of a radius of
Overlapping circles are merged to form a single subpopulation, while non-overlapping circles are considered as
list, two elements:
first element The number of subpopulation
second element A shapefile of the subpopulations
Rivers CM, Bachman SP & Meagher TR, 2010, Subpopulations, locations and fragmentation: applying IUCN red list criteria to herbarium specimen data, Biodiversity Conservation 19:2071-2085
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