Medicinal Plants CAMP Report

Page 43

Figure 1. Structure of the New IUCN categories

criteria that the threat is based on is also given. Table 2 shows the categories chart along with the criteria to each of the taxon assessed at the 1997 Bangalore CAMP. The endemic taxa taken as a whole face a higher degree of threat (89%) as compared to the non-endemic taxa (66%). Comparing the criteria for threat (Figure 2), it is evident that Population Reduction is the main factor for threat categorisation (57%) followed by Restricted Distribution as the second main factor for threat categorisation (43%). Population Estimates and Number of Mature Individuals have been a factor in determining the threat status for only 1 taxon. In 8 cases (14%). both Population Reduction and Restricted Distribution have together contributed to the threat assessment. Since biogeographical endemics do not have wide distribution ranges, it is natural for them to be categorised as threatened based on the Restricted Distribution criterion more than the non-endemic taxa. This is evident in the assessments where 47% of the threatened endemics are categorised based on the Restricted Distribution criterion while only 35% of the threatened non-endemics have been categorised by the same criterion (Figure 2). Population reduction, on the other hand, is the main criterion for threat categorisation in endemic taxa (53%) and non-endemic taxa (65%). Distribution As per IUCN guidelines for Restricted Distribution (see definitions for Taxon Data Sheets end of this report) a taxon is assessed as threatened if it has a restricted distribution. To meet this criterion the taxa also has to qualify two of the three subcriteria (see IUCN categories chart end of this report). Restricted distribution as per IUCN is less than 20,000 sq.km. for the Range of distribution and / or less than 2,000 sq.km. for the Area of occupancy of the


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