Detects any cases where a non-endemic species or species not present on the island has likely been on the island given its ancestral state reconstruction indicating ancestral presence on the island and so is likely a back colonisation from the island to the mainland (or potentially different island). This function is useful if using extraction_method = "min" in DAISIEprep::extract_island_species() as it may brake up a single colonist into multiple colonists because of back-colonisation.
Useful links