Didymaotus lapidiformis | SANBI Sensitive Species

Assessor: Sarah Schumann

Sensitive in 2010

Family

Aizoaceae

Reason for the sensitivity status

this species is Vulnerable as two known locations are potentially threatened with harvesting of wild individuals for the specialist succulent horticultural trade. Few known locations of occurrence with potential threats 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 Vulnerable as two known locations are potentially threatened with harvesting of wild individuals for the specialist succulent horticultural trade as well as habitat loss (Burgoyne & Daniels, 2005). An internet survey indicated that this genus is not very popular in trade and that there is little demand.

Burgoyne, P.M. & Daniels, F. 2005. Didymaotus lapidiformis (Marloth) N.E.Br. 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

Population data on this species is unavailable. Two known locations are potentially threatened and population trend is thought to be stable (Burgoyne & Daniels, 2005).

Burgoyne, P.M. & Daniels, F. 2005. Didymaotus lapidiformis (Marloth) N.E.Br. 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

Individuals are harvested (Burgoyne & Daniels, 2005).

Burgoyne, P.M. & Daniels, F. 2005. Didymaotus lapidiformis (Marloth) N.E.Br. 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 locations of occurrence with potential threats makes this species vulnerable to further population loss. Recruitment and recovery from harvesting may be poor.

Reference file

didymaotus _ eBay.pdf250.13 KB

Didymaotus lapidiformis Threatened Species Programme _ SANBI Red List of South African Plants.pdf537.21 KB