Post by Surroundx on Nov 17, 2016 13:06:28 GMT 1
Scientific Name: Cyrtandra crenata
Species Authority: H.St.John & Storey
Taxonomic Source(s): Wagner, W.L., Herbst, D.R. and Lorence, D.H. 2005 onwards. Flora of the Hawaiian Islands website. Available at: botany.si.edu/pacificislandbiodiversity/hawaiianflora/index.htm.
Assessment Information [top]
Red List Category & Criteria: Critically Endangered (Possibly Extinct) B1ab(iii); D ver 3.1
Year Published: 2016
Date Assessed: 2016-02-01
Assessor(s): Keir, M., Gon, S.M., Sugii, N., Kwon, J., Chau, M., Bruegmann, M., Caraway, V.L., Sporck-Koehler, M. & Weisenberger, L.
Reviewer(s): Sporck-Koehler, M.
Justification:
Cyrtandra crenata is assessed as Critically Endangered (Possibly Extinct). The taxon is endemic to the island of O'ahu and has an extent of occurrence of 30 km2. It has experienced severe and ongoing decline in habitat and numbers due to the impacts of invasive plants and animals and no individuals are currently known. This qualifies the taxon to a ranking of Critically Endangered (Possibly Extinct) under criteria B1ab(iii); D.
Date last seen: 1947
Geographic Range [top]
Range Description:
Endemic to the Hawaiian islands, between 380 and 730 m elevation in the Koolau Mountains on the island of O'ahu.
Countries occurrence:
Possibly extinct:
United States (Hawaiian Is.)
Additional data:
♦ Number of Locations: 1
♦ Lower elevation limit (metres): 380
♦ Upper elevation limit (metres): 730
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population:
The taxon is extremely rare and possibly extinct. There are currently no known individuals.
Current Population Trend: Unknown
Additional data:
♦ Number of mature individuals: 0
Habitat and Ecology [top]
Habitat and Ecology:
The taxon is a shrub found in Hawaiian mesic to wet forest.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes
Threats [top]
Major Threat(s):
The major threats to this taxon include direct competition by invasive non-native plant species, and predation and habitat degradation by non-native animals, particularly include feral pigs and goats, which degrade the habitat and harm the plants through predation, trampling, and rooting for food. Alien plants also threaten the species by altering its habitat and competing with it for moisture, nutrients, light, and space. Rats pose a threat to the species through predation of its plant parts and fruits; and introduced slugs and snails threaten the species by feeding on its leaves, stems, and seedlings. In addition, the taxon is threatened by landslides, drought and hybridization. Fortini et al. (2013) characterized this taxon as extremely vulnerable to climate change (vulnerability index [0.784).
Conservation Actions [top]
Conservation Actions:
The taxon is on the U.S. Endangered Species List, and also on the State of Hawai'i Endangered Species List. No individuals are currently known.
Source: www.iucnredlist.org/details/78787179/0
Species Authority: H.St.John & Storey
Taxonomic Source(s): Wagner, W.L., Herbst, D.R. and Lorence, D.H. 2005 onwards. Flora of the Hawaiian Islands website. Available at: botany.si.edu/pacificislandbiodiversity/hawaiianflora/index.htm.
Assessment Information [top]
Red List Category & Criteria: Critically Endangered (Possibly Extinct) B1ab(iii); D ver 3.1
Year Published: 2016
Date Assessed: 2016-02-01
Assessor(s): Keir, M., Gon, S.M., Sugii, N., Kwon, J., Chau, M., Bruegmann, M., Caraway, V.L., Sporck-Koehler, M. & Weisenberger, L.
Reviewer(s): Sporck-Koehler, M.
Justification:
Cyrtandra crenata is assessed as Critically Endangered (Possibly Extinct). The taxon is endemic to the island of O'ahu and has an extent of occurrence of 30 km2. It has experienced severe and ongoing decline in habitat and numbers due to the impacts of invasive plants and animals and no individuals are currently known. This qualifies the taxon to a ranking of Critically Endangered (Possibly Extinct) under criteria B1ab(iii); D.
Date last seen: 1947
Geographic Range [top]
Range Description:
Endemic to the Hawaiian islands, between 380 and 730 m elevation in the Koolau Mountains on the island of O'ahu.
Countries occurrence:
Possibly extinct:
United States (Hawaiian Is.)
Additional data:
♦ Number of Locations: 1
♦ Lower elevation limit (metres): 380
♦ Upper elevation limit (metres): 730
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population:
The taxon is extremely rare and possibly extinct. There are currently no known individuals.
Current Population Trend: Unknown
Additional data:
♦ Number of mature individuals: 0
Habitat and Ecology [top]
Habitat and Ecology:
The taxon is a shrub found in Hawaiian mesic to wet forest.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes
Threats [top]
Major Threat(s):
The major threats to this taxon include direct competition by invasive non-native plant species, and predation and habitat degradation by non-native animals, particularly include feral pigs and goats, which degrade the habitat and harm the plants through predation, trampling, and rooting for food. Alien plants also threaten the species by altering its habitat and competing with it for moisture, nutrients, light, and space. Rats pose a threat to the species through predation of its plant parts and fruits; and introduced slugs and snails threaten the species by feeding on its leaves, stems, and seedlings. In addition, the taxon is threatened by landslides, drought and hybridization. Fortini et al. (2013) characterized this taxon as extremely vulnerable to climate change (vulnerability index [0.784).
Conservation Actions [top]
Conservation Actions:
The taxon is on the U.S. Endangered Species List, and also on the State of Hawai'i Endangered Species List. No individuals are currently known.
Source: www.iucnredlist.org/details/78787179/0
