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Gibbaeum nebrownii

Assessor: Sarah Schumann

Sensitive in 2010
No
Family
Aizoaceae
Reason for the sensitivity status
This species is threatened with collection of wild individuals for the specialist succulent horticultural trade. This genus is in demand and of popular interest in international horticultural trade. There have been several recorded confiscations of Gibbaeum species from illegal collection. Few known subpopulations with existing threats causing population decline makes this species vulnerable to further population loss. Recruitment and recovery from harvesting may be poor. Releasing data on this species could exacerbate threat and vulnerability.
This species is extremely rare in the wild and is known to be exploited, utilised or traded. The localities of remaining populations need to be protected to avoid any further exploitation, which is likely to drive it to extinction.
Exploitation extent
Significant - wild individuals of the species are known to be exploited, collected, traded or utilized in a targeted manner, and utilisation is widespread, affects the majority of wild populations and/or is causing rapid decline of the wild population.
Justification and references

According to the SANBI Red List Assessment, this species is Critically Endangered as it is highly range restricted with two subpopulations that are experiencing ongoing population decline due to habitat loss and collection of wild individuals for the specialist succulent horticultural trade (Vlok & Raimondo, 2006). This genus is currently in demand and of popular interest in international horticultural trade, as indicated by several online marketplace, e-commerce and auction sites. There have been several recorded confiscations of Gibbaeum species from illegal collection (Confiscation List (2019-2022) provided by Cape Nature, SANParks Sendelingsdrift Botanic Garden, Karoo Desert Botanical Garden, and Kirstenbosch Botanical Garden). 

Vlok, J.H. & Raimondo, D. 2006. Gibbaeum nebrownii Tischer. National Assessment: Red List of South African Plants version 2020.1.

Population vulnerability
Population is vulnerable: size is <= 2500 mature individuals OR the number of known subpopulations is <= 5 OR range is <= 100km2 OR species at risk of localised extinctions
Justification and references

This taxon has an extent of occurrence of less than 20 km² with two fragmented subpopulations (Vlok & Raimondo, 2006).

Vlok, J.H. & Raimondo, D. 2006. Gibbaeum nebrownii Tischer. National Assessment: Red List of South African Plants version 2020.1.

Targeted demographics
Mature (breeding) individuals are killed, significantly weakened or are permanently removed from the wild, OR immature individuals are targeted and this significantly impacts mature (breeding) individuals.
Justification and references

Whole individuals are removed from the wild (Vlok & Raimondo, 2006).

Vlok, J.H. & Raimondo, D. 2006. Gibbaeum nebrownii Tischer. National Assessment: Red List of South African Plants version 2020.1.

Regeneration potential
This species has a slow population growth rate, or the growth rate varies depending on habitat, and there is a poor chance the wild populations will recover from exploitation OR a collector might feasibly harvest the entire extant population removing the chance of subsequent recruitment.
Justification and references

Few known subpopulations with existing threats causing population decline makes this species vulnerable to further population loss. Recruitment and recovery from harvesting may be poor. 

Reference file
gibbaeum _ eBay.pdf1.25 MB
Gibbaeum Aucfan.pdf1.05 MB