Conophytum calculus subsp. vanzylii

Assessor: Sarah Schumann

Sensitive in 2010
No
Family
Aizoaceae
Reason for the sensitivity status
This subspecies and several others of the genus are known to be targeted, exploited and illegally removed from the wild, causing population decline. Evidence shows that the Conophytum genus is in high demand in international horticultural trade. Although this subspecies' population size is not small, the vast majority of the genera's regeneration potential from collection is poor, making this subspecies vulnerable to population loss and threatened with over-collection. Releasing data on this subspecies can exacerbate threat and vulnerability.
This species is threatened by widespread, unregulated, unsustainable exploitation of wild populations. 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 IUCN and SANBI Red List Assessments, this subspecies is Critically Endangered as it is experiencing population decline due to threat of illegal collection for succulent trade, habitat degradation and loss (Young & Raimondo, 2020; Young, 2022).  This is a slow growing plant that has become particularly sought after by collectors (Young, 2022). As of 2019, this genus has become popular in trade and there is a high demand from international and domestic horticultural markets for wild collected plants as indicated by media, police reports and several online marketplace, e-commerce, and auction sites (Friedman, 2021; Tshuma, 2021; Trenchard, 2021; Hyman, 2020; Young, 2020). Plants of this genus were among those targeted and confiscated during recent criminal prosecutions of illegal plant collecting (Majikela, 2020; Myburgh, 2021).  There have been several recorded confiscations of the species and others of the genus from illegal plant collection (Confiscation Lists (2019-2021) provided by Cape Nature, SANBI Karoo Desert National Botanical Garden, Kirstenbosch Botanical Garden, SANParks Sendelingsdrift Botanic Garden and the Department of Forestry, Fisheries and the Environment). This suggests that this genus is being targeted and this subspecies is threatened.

Friedman, B. 2021. 24 May 2021. South Africa targeted for rare plant poaching placing biodiversity at risk. Cape Talk. Available at: https://www.capetalk.co.za/articles/417213/south-africa-targeted-for-rare-plant-poaching-placing-biodiversity-at-risk

Hyman, A. 2020. 1 February 2020. Koreans fined R5m as poachers target SA's succulent treasure chest. Times Live. Available at: https://www.timeslive.co.za/news/south-africa/2020-02-01-koreans-fined-r5m-as-poachers-target-sas-succulent-treasure-chest/

Majikela, M. 2020. 31 January 2020. Hefty sentencing for possession of Conophytum plants. Media Statement. South African Police Service Office of the Provincial Commissioner Western Cape. Available at: https://www.saps.gov.za/newsroommsspeechdetail.php?nid=24491

Myburgh, A. 2021. 20 January 2021. Man behind bars for possession of endangered plants (Conophytum). Media Statement South African Police Service, Office of the Provincial Commissioner North West. Available at: https://www.saps.gov.za/newsroom/msspeechdetail.php?nid=24491

Trenchard, T. 2021. 31 July 2021. In South Africa, Poachers Now Traffic in Tiny Succulent Plants. The New York Times. Available at: https://www.nytimes.com/2021/07/31/world/africa/south-africa-poachers-tiny-succulent-plants.html

Tshuma, N. 2021. 20 May 2021. Collectors drive a spike in theft of indigenous plants in the Western Cape. IOL. Available at: https://www.iol.co.za/capeargus/news/collectors-drive-a-spike-in-theft-of-indigenous-plants-in-the-western-cape-e120f529-741b-43a7-8454-cb8f69544878

Young, A.J. 2020. Conophytum armianum S.A.Hammer. National Assessment: Red List of South African Plants version 2020.1. 

Young, A.J. & Raimondo, D. 2020. Conophytum calculus (A.Berger) N.E.Br. subsp. vanzylii (Lavis) S.A.Hammer. National Assessment: Red List of South African Plants version 2020.1.

Young, A. 2022. (assessment in prep 2022) Conophytum calculus subsp. vanzylii . The IUCN Red List of Threatened Species.

Population vulnerability
Population is not vulnerable: size is > 2500 mature individuals, AND the number of known subpopulations is > 5 AND range > 100km2
Justification and references

This taxon has an extent of occurrence of 4243kmĀ², 15 known locations and an estimated population size of more than 10000 mature individuals (Young & Raimondo, 2020; Young, 2022).

Young, A.J. & Raimondo, D. 2020. Conophytum calculus (A.Berger) N.E.Br. subsp. vanzylii (Lavis) S.A.Hammer. National Assessment: Red List of South African Plants version 2020.1.

Young, A. 2022. (assessment in prep 2022) Conophytum calculus subsp. vanzylii . The IUCN Red List of Threatened Species.

 

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 recorded in confiscations.

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

This taxon is slow growing (Young & Raimondo, 2020). Regeneration potential for the vast majority of the Conophytum genus is very poor as recruitment is low and dependent on successive, appropriate weather conditions. Seeds are not known to disperse. Regeneration will take decades. (Young, personal communication 2021, 5 October)

Young, A.J. & Raimondo, D. 2020. Conophytum calculus (A.Berger) N.E.Br. subsp. vanzylii (Lavis) S.A.Hammer. National Assessment: Red List of South African Plants version 2020.1.