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Psittirostra psittacea

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AVES PASSERIFORMES FRINGILLIDAE

Scientific Name: Psittirostra psittacea
Species Authority: (Gmelin, 1789)
Common Name(s):
English Ou, 'O'u

Assessment Information [top]

Red List Category & Criteria: Critically Endangered D ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Camp, R., Fretz, S., Gorresen, M., Pratt, T., VanderWerf, E., Woodworth, B. & Lepson, J.
Facilitator/Compiler(s): Benstead, P., Bird, J., Butchart, S., Derhé, M., Isherwood, I., Stattersfield, A., Stuart, T. & Symes, A.
Justification:
This species has not been recorded with certainty on Kaua'i since 1989 nor on Hawai'i since 1987, and recent searches specifically for it have failed. It may have been driven extinct by habitat loss, introduced rats, and in particular from malaria from introduced mosquitoes. However, it cannot yet be presumed to be Extinct until all potential areas have been surveyed, particularly in Ka`u, Waiakea, and Pu`u Maka`ala, and recent unconfirmed reports have been followed up by systematic searches. Any remaining population is likely to be tiny, and for these reasons it is treated as Critically Endangered (Possibly Extinct).

Geographic Range [top]

Range Description: Psittirostra psittacea was originally widespread in the Hawaiian Islands (USA), but was extirpated from O`ahu, Maui, Moloka`i and then Lana`i between 1899 and 1931 (Snetsinger et al. 1998). On Kaua`i, it survived in the Alaka`i Wilderness Preserve into the mid-1970s, with c.62 birds being present during 1968-1973 (USFWS 1983), but only a few in 1981 (Scott et al. 1986), two in 1989 and none since. On Hawai`i, several populations were present in the early 1980s, with c.394 estimated during 1976-1983 (Scott et al. 1986) but, in 1984, a lava-flow from Mauna Loa passed through the Upper Waiakea Forest Reserve, the species's stronghold (Scott et al. 1986, Snetsinger et al. 1998), and the last confirmed sighting was in 1987 (Snetsinger et al. 1998). However, since 1995 there have been unconfirmed reports from Koai`e Stream, Alaka`i (Kaua`i) and Pu`u Maka`ala Natural Area Reserve and Kapapala-Ka`u Forest Reserve (Hawai`i) (Snetsinger et al. 1998, J. Lepson in litt. 1999). The prognosis is poor, especially given the species's preference for lower elevations where habitat loss and the impacts of introduced disease and predators have been most severe, but it cannot yet be presumed to be Extinct until the last areas have been intensively surveyed (S. Fretz, E. Vanderwerf, R. Camp and M. Gorresen in litt. 2003). Any remaining population is likely to be tiny.

Countries:
Possibly extinct:
United States
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Any remaining population is assumed to be tiny (numbering fewer than 50 individuals and mature individuals), with unconfirmed reports since 1995, but no confirmed records since 1987.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: It is restricted to wet to mesic `ohi`a forest between 800 and 1,900 m, mainly 1,200-1,500 m (Scott et al. 1986, Snetsinger et al. 1998). Its bill is adapted to feeding on `ie`ie, an understory vine, and outside the `ie`ie fruiting season, it is nomadic in response to seasonal fruit and invertebrate abundance (Snetsinger et al. 1998).

Systems: Terrestrial

Threats [top]

Major Threat(s): Habitat has been lost and modified by logging and agriculture, and `ie`ie has declined because of pressure from introduced rats and ungulates (Snetsinger et al. 1998). Feral pigs, in particular, are pervasive habitat degraders (Scott et al. 1986, Anderson and Stone 1993, Pratt 1994)and their activity benefits the introduced mosquito vectors of avian diseases which are implicated in the rapid decline of this species (Scott et al. 1986, Pratt 1994, Snetsinger et al. 1998), especially given that its nomadic behaviour may increase its exposure to disease (Snetsinger et al. 1998). The population has been decimated by hurricanes on Kaua`i and lava-flows on Hawai`i (Conant et al. 1998, Snetsinger et al. 1998).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
Recent reports of this species come from three protected areas (Snetsinger et al. 1998). A Rare Bird Search Project was implemented to find the species and make recommendations for its conservation, but none were located (Snetsinger et al. 1998). Feral pig elimination is being carried out in a number of protected areas in Hawai`i (Anderson and Stone 1993) which could hold remnant populations. The Kaua`i Watershed Alliance and The Nature Conservancy are considering fencing (to exclude herbivores and possibly other predators) the north-eastern section of the Alakai Plateau on Kaua`i, where the species was last recorded.

Conservation Actions Proposed
Perform further surveys to locate any remaining populations, following up unconfirmed reports as a priority. Manage ecosystems intensively in areas where the species could still occur (Snetsinger et al. 1998). Plant and encourage food-plants in areas where they have been extirpated (Snetsinger et al. 1998). Remove feral ungulates (Snetsinger et al. 1998). If birds are found, attempt to increase the population by captive propagation (Scott et al. 1986, Snetsinger et al. 1998). If found, protect nests (Snetsinger et al. 1998).


Citation: BirdLife International 2012. Psittirostra psittacea. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 23 September 2014.
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