Rationale (Changed due to Same category and criteria)
This is an endemic species occurring in open grasslands in the central interior of the assessment region. There are at least an estimated 16,260 individuals (counts conducted between 2012 and 2015) on protected areas across the Free State, Gauteng, North West, Northern Cape, Eastern Cape, Mpumalanga and KwaZulu-Natal (KZN) provinces (mostly within the natural distribution range). This yields a total mature population size of 9,765-11,382 (using a 60-70% mature population structure). This is an underestimate as there are many more subpopulations on wildlife ranches for which comprehensive data are unavailable. Most subpopulations in protected areas are stable or increasing. For example, there has been 7-9% annual increase in the Eastern Cape provincial protected areas over the past decade, and an average annual growth rate of 29% in the Free State provincial protected areas. Nationally, there has been an estimated population increase of 213% (2,567 to 8,063 individuals) over three generations (1992-2015) using a sample of 16 formally protected areas for which long-term data are available.While grassland habitat loss remains a threat to this species, it continues to be well represented in protected areas and the expansion of wildlife ranching may be conserving additional habitat. The only major identified threat is the risk of hybridisation with Blue Wildebeest, a threat enhanced by the fenced and fragmented nature of existing subpopulations. Although it is likely that Black and Blue Wildebeest hybridised occasionally, they are naturally spatially separated through ecological specialisation. Historical habitat reduction, however, has restricted the two species to pockets of reserves and may have artificially induced hybridisation. There is worrying evidence that some formally protected subpopulations may contain hybrid individuals and further research is in progress to assess the extent of hybridisation in the population. This species will need reassessment once comprehensive data on the extent of hybridisation is produced. Currently, the hybridisation threat is being managed through implementing management practices such as separating Black and Blue Wildebeest in protected areas and through enforcing strict translocation policies. Only counting the five subpopulations that are generally accepted to be genetically pure, based on management history, the total population size may be lower than 1,000 mature individuals (currently estimated as 800-950), which would justify a Vulnerable or Near Threatened D1 listing under a precautionary purview until further analysis reveals other pure subpopulations and increases this number. However, until further data suggest otherwise, we retain the Least Concern listing as the total protected population is well above 1,000 mature individuals and is increasing. Conservation efforts should be concentrated on sustaining pure populations of Black Wildebeest in protected areas and on establishing additional pure subpopulations through a coordinated translocation program and metapopulation plan. The role of incidental and deliberate back-crossing in reducing the frequency of introgressed alleles in putative hybrid population should also be investigated. As such, this species should remain conservation dependent and retain its status as a Least Concern endemic and flagship species for our grasslands