Subpopulations, locations and fragmentation: applying IUCN red list criteria to herbarium specimen data

摘要: Despite the ecological and economic importance of plants, majority plant species their conservation status are still poorly known. Based on limited knowledge we have many species, especially those in tropics, use GIS techniques can give us estimates degree population subdivision to be used assessments extinction risk. This paper evaluates how best IUCN Red List Categories Criteria produce effective consistent subpopulation structure based specimen data available herbaria around world. We assessed through GIS-based analysis geographic distribution collections, using herbarium for 11 Delonix sensu lato. four methods: grid adjacency, circular buffer, Rapoport’s mean propinquity alpha hull, quantify according terms List: numbers subpopulations locations, fragmentation. our findings, recommend buffer method, as it is not dependent collection density allows points added, subtracted and/or moved without altering placement. The ideal radius debatable; however when dispersal characteristics unknown then a sliding scale, such 1/10th maximum inter-point distance, preferred choice, species-specific sensitive density. Such quantitative measures provide rigorous means applying criteria wide range that hitherto were inaccessible classification.