|Scientific Name:||Cyanea truncata (Rock) Rock|
Rollandia truncata Rock
|Taxonomic Source(s):||Wagner, W.L., Herbst, D.R. and Lorence, D.H. 2005 onwards. Flora of the Hawaiian Islands website. Available at: http://botany.si.edu/pacificislandbiodiversity/hawaiianflora/index.htm.|
|Red List Category & Criteria:||Critically Endangered B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v); C2a(i,ii); D ver 3.1|
|Assessor(s):||Bruegmann, M., Caraway, V.L. & Keir, M.|
|Contributor(s):||Chau, M., Gon, S.M., Kwon, J., Sporck-Koehler, M., Sugii, N., Weisenberger, L. & Yoshioka, J.M.|
Cyanea truncata is assessed as Critically Endangered. The taxon is endemic to the island of Oʻahu and has an extent of occurrence of 17 km². It has experienced severe and ongoing decline in habitat and numbers due to the impacts of invasive plants and animals. Its area of occupancy is 4 km² and declining. Its distribution is severely limited, with only a single plant left. This qualifies the taxon to a ranking of Critically Endangered under criteria B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v); C2a(i,ii); D.
|Previously published Red List assessments:|
Endemic to the Hawaiian islands, between 240 and 400 m elevation on the island of Oʻahu.
Native:United States (Hawaiian Is.)
|Range Map:||Click here to open the map viewer and explore range.|
The taxon is extremely rare, with a total known population of a single mature individual plant.
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||The taxon is a shrub found in Hawaiian subtropical moist lowland forest.|
|Continuing decline in area, extent and/or quality of habitat:||Yes|
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 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. Fortini et al. (2013) characterized this taxon as extremely vulnerable to climate change (vulnerability index [0.76]).
The taxon is on the U.S. Endangered Species List, and also on the State of Hawaiʻi Endangered Species List. The single subpopulation does not occur in a protected area, but it is managed and monitored by the Hawaiʻi State Plant Extinction Prevention Program. Ex situ cultivation and propagule storage is also ongoing. Outplantings have occurred, but have not yet produced viable offspring. Further research is needed on general ecology, life history, population size, distribution, and trends; population genetics, and threats.
|Citation:||Bruegmann, M., Caraway, V.L. & Keir, M. 2016. Cyanea truncata. The IUCN Red List of Threatened Species 2016: e.T44053A83791995.Downloaded on 18 June 2018.|
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