Southern Black Korhaan  (Afrotis afra)

Global Status

IUCN Data (Global)

IUCN 2024. IUCN Red List of Threatened Species. Version 2024-1 (www)

Assessment year: 2016

Assessment Citation

BirdLife International 2016. Afrotis afra. The IUCN Red List of Threatened Species 2016: e.T22691975A93331501. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22691975A93331501.en. Accessed on 21 November 2024.

Taxonomic notes:

Afrotis afra (del Hoyo and Collar 2014) was previously placed in the genus Eupodotis.

Afrotis (Eupodotis) afra and E. afraoides (Sibley and Monroe 1990, 1993) are retained as separate species contra Dowsett and Forbes-Watson (1993) who included afraoides as a subspecies of E. afra.

Geographic range:

This species is endemic to southwestern South Africa, where it occurs in Northern Cape, Western Cape and Eastern Cape provinces from Little Namaqualand south to Cape Town and then east to Grahamstown. It was historically very common but appears to have become scarcer and its distribution more fragmented (Hofmeyr 2012).

Habitats:

The species is restricted to the non-grassy, winter rainfall or mixed winter-summer rainfall fynbos and succulent Karoo biomes, and the extreme south of the Nama-Karoo biome, in a narrow strip along the southern and western coastlines of South Africa (Hofmeyr 2012). It also occurs in semi-arid scrub and dunes with succulent vegetation, and extends into renosterveld scrub and semi-arid karoo (del Hoyo et al. 1996, Hockey et al. 2005). It occurs occasionally in cultivated fields with nearby cover (Hockey et al. 2005). The diet consists of insects, small reptiles and plant material, including seeds and green shoots (Hockey et al. 2005).

Population:

The global population size has not been quantified, but the species has been described as "uncommon to common" (Hockey et al. 2005).

Threats:

Conversion of natural vegetation to agriculture is likely to be the primary threat. In Overberg and Swartland, where the species has declined, the intensity of agricultural cultivation has increased in recent years (D. Young in litt. 2013). Coordinated Avifaunal Roadcounts project data show that, whilst the species can use farmland where little else is available (especially in the Overberg, where c.80% of land is transformed), in general they prefer natural veld (Hofmeyr 2012). Patches of indigenous vegetation have probably not only decreased in size but also become more isolated (D. Young in litt. 2013). Increasing agricultural activity is likely to not only cause a decrease in suitable breeding territories, but also decreased breeding success as a result of increased disturbance related to farming activities and increased chick and egg predation because of a general decrease in cover and an increase in predators such as Pied Crows (Hofmeyr 2012). It is also possible that adults have suffered increased predation rates and even increased starvation because of the decline in cover and suitable habitat (Hofmeyr 2012). Climate change may aggravate the threat of habitat loss (Hofmeyr 2012).

Conservation measures:

Conservation and research actions underway
CITES Appendix II.

Conservation and research actions needed
Conduct more detailed studies with the aim of improving our understanding of the status of the population, the causes of its decline, and any possible mitigation measures that may be taken (Hofmeyr 2012).

Rationale:

This small bustard is listed as Vulnerable as it is suspected to be undergoing rapid population declines owing to the loss and fragmentation of its habitat to agricultural conversion.

Trend justification:

Comparison of data from the first and second Southern African Bird Atlas Projects (SABAP1, 1987–1992 and SABAP2, 2007–) indicates that the species declined in abundance in c.80% of its range between 1992 and 2010, and by over 30% during the study period, although the decline may have decelerated from 2008 onwards (Hofmeyr 2012). Occupancy modelling using the same data confirmed this, showing declines in abundance and range across most of its range. Comparison of results from an extensive terrestrial road census in the Karoo with those from a similar study in the 1980s also found a marked population decline (Shaw 2013, Shaw et al. 2015), and data from the Coordinated Avifaunal Roadcounts project also indicate declines between 1997 and 2010 in Overberg and Swartland (S. Hofmeyr and D. Young in litt. 2013). Subsequent analysis of the SABAP data to April 2013 indicates the situation may be more serious, with slight declines in the Eastern Cape population and declines in the Northern Cape and especially the Western Cape appearing to be more significant than previously suspected (S. Hofmeyr in litt. 2013). On-going population declines within the range 30-49% in 31 years (three generations) are suspected based on these analyses.