|Scientific Name:||Cyanea remyi Rock|
Delissea remyi (Rock) H.St.John
|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 C2a(i); D ver 3.1|
|Contributor(s):||Wood, K. & Nyberg, B.|
Cyanea remyi is assessed as Critically Endangered under criteria C and D (C2a(i); D). The taxon is endemic to the island of Kaua'i and has an extent of occurrence of 219 km2. It has experienced severe and ongoing decline in habitat and numbers (only 46 remain) due to the impacts of invasive plants and animals. Its area of occupancy is now 10 km2.
Endemic to the Hawaiian Islands, between 600 and 1,158 m elevation on the island of Kaua'i.
Native:United States (Hawaiian Is.)
|Range Map:||Click here to open the map viewer and explore range.|
This taxon is rare, with a total known population of 46 individuals in 10 subpopulations.
|Current Population Trend:||Decreasing|
|Habitat and Ecology:|
The taxon is a shrub found in Hawaiian Lowland Wet Forest dominated by stunted Metrosideros polymorpha around Blue Hole, Metrosideros polymorpha - Dicranopteris linearis in upper Wahiawa Valley, and Tetraplasandra sp. – Cheirodendron sp. – Dicranopteris linearis on Mt. Kahili (USFWS 2010).
|Continuing decline in area, extent and/or quality of habitat:||Yes|
Major threats to this taxon include direct competition by invasive non-native plant species, especially Clidemia hirta, Melastoma septemnervium, Phaius tankervilleae, Psidium cattleianum, Trema orientalis, and Rubus rosifolius and depredation of habitat by non-native animals, particularly feral pigs (Sus domesticus). Severe damage to stems, fruits and seeds occurs from slugs and rats (Rattus rattus) (USFWS 2010). Germplasm production is often interrupted from the loss of native pollinators, both bird and insect. Seed dispersal cycles have also been greatly reduced due to the drastic decline of endemic avian fauna. In addition, the taxon is also threatened by floods and landslides since it grows in areas subject to such stochastic events.
The taxon is listed as Endangered on the US Endangered Species List, and also on the State of Hawai'i Endangered Species List. Ex situ cultivation and propagule storage is ongoing. The National Tropical Botanical Garden has and continues to undertake ex situ conservation work through the growing of plants in the Living Collections and Horticulture Nursery and storage of seeds in the NTBG Seed Lab.
|Errata reason:||This errata assessment has been created because the map was accidentally left out of the version published previously.|
|Citation:||Walsh, S. 2016. Cyanea remyi. (errata version published in 2017) The IUCN Red List of Threatened Species 2016: e.T78777599A115496141.Downloaded on 17 October 2017.|
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