Post by Melanie on Jul 6, 2018 11:14:19 GMT 1
Red List Category & Criteria: Extinct ver 3.1
Year Published: 2018
Date Assessed: 2016-10-21
Assessor(s): Simo, M., Stévart, T. & Droissart, V.
Reviewer(s): Lowry, P., Schatz, G.E., Onana, J.-M. & Rankou, H.
Justification:
The species is presumed Extinct (EX) according to the IUCN Red List Guidelines (IUCN Standards and Petitions Subcommittee 2016). The extent of occurrence (EOO) of Angraecum astroarche cannot be estimated because the species is only known from the type collection. The species was known from one subpopulation in the northern part of the São Tomé Island, outside the Obò National Park. The part of the island where the species occurred is experiencing significant threats from shifting agriculture, selective logging and wood cutting for small-scale subsistence. This human pressure is projected to continue and will intensify in the foreseeable future. Despite 18 months of fieldwork on the island, collecting and growing orchids, no specimens that could be attributed to this species were found. Based on the information available, A. astroarche is assessed as Extinct.
Geographic Range [top]
Range Description:
Angraecum astroarche was endemic to São Tomé Island (São Tomé and Principe) and restricted to forests of the northern part of the island (83% of the island area). The species was found at 900 m elevation. The extent of occurrence (EOO) cannot be estimated since the species is known only from the type subpopulation, while the area of occupancy (AOO) was estimated to be 4 km2, but as it is no longer extant it no longer has an EOO or AOO.
Countries occurrence:
Regionally extinct:
Sao Tomé and Principe (Sâo Tomé)
Additional data:
♦ Estimated area of occupancy (AOO) - km2: 0-4 ♦ Continuing decline in area of occupancy (AOO): Yes
♦ Estimated extent of occurrence (EOO) - km2:
♦ Continuing decline in extent of occurrence (EOO): No
♦ Number of Locations: 0-1 ♦ Continuing decline in number of locations: Yes
♦ Lower elevation limit (metres): 900
♦ Upper elevation limit (metres): 900
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population:
The population of Angraecum astroarche is thought to have declined because the species habitat has been degraded by selective logging. Angraecum astroarche was known from one subpopulation in the northern part of São Tomé Island. The species is presumed to be extinct.
Additional data:
♦ Number of mature individuals: 0
♦ Population severely fragmented: No
Habitat and Ecology [top]
Habitat and Ecology: There is no details about the preferred habitat/ecology of Angraecum astroarche. However, according to its elevation range, it is inferred that this epiphytic species grew on trees in lowland forest on the island.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes
Use and Trade [top]
Use and Trade: The species is not known to be used or traded, however, specialist collectors with an interest in collecting and growing epiphytes might be interested in the species hence the range maps are not published here.
Threats [top]
Major Threat(s): Angraecum astroarche was threatened by shifting agriculture and selective logging for construction of houses and domestic use. No plants are known from any protected areas. The species is only known from the type specimen collected in 1888 at Nova Moca. Since then, there have been no further collections of the species despite intensive field surveys made in the region.
Conservation Actions [top]
Conservation Actions: Angraecum astroarche resembles Diaphananthe rutila and could therefore be confused with it. Additional surveys are needed to see if the species can be relocated at Nova Moca.
www.iucnredlist.org/details/87583728/0
Year Published: 2018
Date Assessed: 2016-10-21
Assessor(s): Simo, M., Stévart, T. & Droissart, V.
Reviewer(s): Lowry, P., Schatz, G.E., Onana, J.-M. & Rankou, H.
Justification:
The species is presumed Extinct (EX) according to the IUCN Red List Guidelines (IUCN Standards and Petitions Subcommittee 2016). The extent of occurrence (EOO) of Angraecum astroarche cannot be estimated because the species is only known from the type collection. The species was known from one subpopulation in the northern part of the São Tomé Island, outside the Obò National Park. The part of the island where the species occurred is experiencing significant threats from shifting agriculture, selective logging and wood cutting for small-scale subsistence. This human pressure is projected to continue and will intensify in the foreseeable future. Despite 18 months of fieldwork on the island, collecting and growing orchids, no specimens that could be attributed to this species were found. Based on the information available, A. astroarche is assessed as Extinct.
Geographic Range [top]
Range Description:
Angraecum astroarche was endemic to São Tomé Island (São Tomé and Principe) and restricted to forests of the northern part of the island (83% of the island area). The species was found at 900 m elevation. The extent of occurrence (EOO) cannot be estimated since the species is known only from the type subpopulation, while the area of occupancy (AOO) was estimated to be 4 km2, but as it is no longer extant it no longer has an EOO or AOO.
Countries occurrence:
Regionally extinct:
Sao Tomé and Principe (Sâo Tomé)
Additional data:
♦ Estimated area of occupancy (AOO) - km2: 0-4 ♦ Continuing decline in area of occupancy (AOO): Yes
♦ Estimated extent of occurrence (EOO) - km2:
♦ Continuing decline in extent of occurrence (EOO): No
♦ Number of Locations: 0-1 ♦ Continuing decline in number of locations: Yes
♦ Lower elevation limit (metres): 900
♦ Upper elevation limit (metres): 900
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population:
The population of Angraecum astroarche is thought to have declined because the species habitat has been degraded by selective logging. Angraecum astroarche was known from one subpopulation in the northern part of São Tomé Island. The species is presumed to be extinct.
Additional data:
♦ Number of mature individuals: 0
♦ Population severely fragmented: No
Habitat and Ecology [top]
Habitat and Ecology: There is no details about the preferred habitat/ecology of Angraecum astroarche. However, according to its elevation range, it is inferred that this epiphytic species grew on trees in lowland forest on the island.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes
Use and Trade [top]
Use and Trade: The species is not known to be used or traded, however, specialist collectors with an interest in collecting and growing epiphytes might be interested in the species hence the range maps are not published here.
Threats [top]
Major Threat(s): Angraecum astroarche was threatened by shifting agriculture and selective logging for construction of houses and domestic use. No plants are known from any protected areas. The species is only known from the type specimen collected in 1888 at Nova Moca. Since then, there have been no further collections of the species despite intensive field surveys made in the region.
Conservation Actions [top]
Conservation Actions: Angraecum astroarche resembles Diaphananthe rutila and could therefore be confused with it. Additional surveys are needed to see if the species can be relocated at Nova Moca.
www.iucnredlist.org/details/87583728/0
