![]() ![]() The previous assessment used an older version of the IUCN Red List Categories and Criteria and the reassessment uses the current criteria which have slightly different thresholds.An error has been discovered in the previous assessment (e.g., the wrong information was used the IUCN Red List Categories and Criteria were applied incorrectly etc.).are now larger than they were previously). or it has been merged with other species so the range, population size, etc. There has been a taxonomic revision resulting in the species no longer being the same concept as it was before (e.g., it is now split into several species each with smaller ranges, population sizes, etc.New information has become available since the last assessment (e.g., more recent data are available on population sizes, threatening processes, rates of decline or recovery, etc.).This reassessment may result in species moving into a different Red List Category for non-genuine or genuine reasons: Non-genuine reasons In order to monitor the changing status of biodiversity, it is essential to reassess species periodically. ![]() More detailed analyses of specific taxonomic groups and the results of regional assessment projects can be found in the Resources & Publications section or in the regional pages for Europe, the Mediterranean, the Gulf of Mexico, and the Persian Gulf.Ī dynamic Red List: reasons for changing status taxonomic revisions result in the total number of recognised species within a group changing.Īll of the statistics presented in the summary tables are for species only (i.e., they do not include subspecies, varieties or geographically isolated subpopulations or stocks). ![]()
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