Palmeria dolei 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Fringillidae

Scientific Name: Palmeria dolei (Wilson, 1891)
Common Name(s):
English Akohekohe, 'Akohekohe, Crested Honeycreeper
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
Identification information: 18 cm. Large honeycreeper with slightly downcurved, sharp bill and distinctive forward-curving crest of stiff, white feathers on forehead. Mostly black, streaked and spotted with orange-red and silvery-grey. Shaggy red-orange patch on hindneck, orange-buff eye-ring and short postocular stripe. Orange-buff thighs. Primaries and tail feathers tipped white. Sexes similar, but juvenile all sooty-grey with orange-buff eye-ring and very short, grey crest. Voice Song a variable series of low-pitched notes ah-gurk-gurk-gurk or ah-koh-heh-koh-heh and many other variations. Call a human-like upslurred whistle.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii,v) ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Baker, P.E., Camp, R., Fretz, S., Gorresen, M., Simon, J., VanGelder, E., VanderWerf, E., Woodworth, B. & Mounce, H.
Facilitator/Compiler(s): Benstead, P., Bird, J., Derhé, M., Harding, M., Isherwood, I., Stattersfield, A., Stuart, T., Symes, A., Wright, L & North, A.
This species is listed as Critically Endangered because of its extremely small range and the imminent threat of feral deer impacting habitat. It remains at risk from the effects of exotic taxa. A particular concern is the possible introduction of a disease-carrying mosquito species tolerant of the cooler climate at higher altitudes, thereby bringing currently safe populations of birds into contact with lethal diseases.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Palmeria dolei occurs on Maui in the Hawaiian Islands (USA) and is extinct on Moloka`i (last confirmed observations in 1907). On Maui, it remains moderately common within 58 km2 on the north-eastern slopes of Haleakala, with a population estimated at c. 3,800 birds in 1980 (Scott et al. 1986). Surveys in the 1990s to 1997 indicate stability, although areas outside protected areas were not necessarily covered (Jacobi and Atkinson 1995, Berlin and VanGelder 1999).

Countries occurrence:
United States (Hawaiian Is.)
Additional data:
Extreme fluctuations in area of occupancy (AOO):No
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:1Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):1100
Upper elevation limit (metres):2300
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Scott et al. (1986) estimated the population to number 3,800 individuals in total, roughly equivalent to 2,500 mature individuals.

Trend Justification:  Declines are suspected owing to a number of threatening processes that are likely to reduce the population size, although the likely overall rate of decline has not been estimated.

Current Population Trend:Decreasing
Additional data:
Number of mature individuals:3800Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
No. of subpopulations:1Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:Yes
No. of individuals in largest subpopulation:100

Habitat and Ecology [top]

Habitat and Ecology:It occurs in mesic `ohi`a-koa and wet `ohi`a forest from 1,100-2,300 m (99% above 1,500 m, mostly below 2,100 m). It primarily feeds on `ohi`a nectar, also taking invertebrates, especially caterpillars. When `ohi`a bloom is at its seasonal low, it feeds on subcanopy and understorey flowers and fruit (Scott et al. 1986, Berger 1972, P. Baker in litt. 1999, J. C. Simon in litt. 1999). Average adult male home range is 0.56 ha, giving rise to density figures of 2.9 birds/ha (Pratt et al. 2001). All known nests have been in `ohi`a trees (Berlin and VanGelder 1999). It raises 1-2 young per nest, usually nesting twice seasonally (November to June [Simon et al. 2001]), and has a relatively high success rate (J. C. Simon in litt. 1999, Simon et al. 2001). Adult survivorship is similarly high (Simon et al. 2001). Birds, perhaps especially immatures, may disperse to lower elevations (Berlin and VanGelder 1999).

Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):5.5
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Habitat destruction and modification and the rapid spread of disease-carrying mosquitoes in the lowlands are thought to be responsible for past declines. The species may be particularly vulnerable to mosquito-borne diseases because it migrates altitudinally in response to varying `ohi`a flowering physiology, potentially increasing exposure to mosquitoes at lower elevations (USFWS 2003). From 1945 to 1995, the spread of feral pigs on Haleakala caused chronic habitat degradation (Loope and Medeiros 1995) and facilitated the spread of mosquitoes into remote rainforests (Pratt 1994). In Hanawi Natural Area Reserve, there was a 473% increase in pig activity, as indexed by ground-cover disturbance, during 1970-1997 (Rosa et al. 1998), and this reduced alternative food sources to `ohi`a bloom (Berlin and VanGelder 1999). Predation by introduced rats, cats, Barn Owl (Tyto alba) and possibly small Indian Mongooses (Herpestes auropunctatus) is a further limiting factor (Berlin and VanGelder 1999, J. M. Scott in litt. 1999, J. C. Simon in litt. 1999, E. VanGelder in litt. 1999). Climate change is an additional threat that may cause habitat shifts and extreme weather events.

Conservation Actions [top]

Conservation Actions: Conservation and Research Actions Underway
Cooperative management of the East Maui watershed includes fencing at c.1,070 m and removal of feral ungulates (Loope and Medeiros 1995, P. Baker in litt. 1999). In the Waikamoi Preserve, Hanawi Natural Area Reserve and Haleakala National Park, conservation practices combat the establishment of alien plants and, from the late 1980s, feral pigs have been controlled (Loope and Medeiros 1995, Simon et al. 1997). Research into captive breeding was attempted, and six individuals were hatched from late-stage wild eggs (USFWS 2003). A banding study investigating productivity and survival began in 2008 (Maui Forest Bird Recovery Project). A research project began in 2013 using radio-tracking to determine juvenile and adult habitat selection, dispersal and seasonal movements (Maui Forest Bird Recovery Project 2013).

Conservation and Research Actions Proposed
Carry out surveys to obtain an up-to-date estimate of the population size. Monitor population trends through regular surveys. Preserve remote and ecologically diverse areas, especially on the northern slopes of Haleakala (Berlin and VanGelder 1999). Extend plant control to areas outside reserves, especially at mid-elevations (Loope and Medeiros 1995, Simon et al. 1997). Complete and routinely monitor the East Maui watershed habitat conservation programme (P. Baker in litt. 1999, J. C. Simon in litt. 1999). Establish a population in historically occupied habitat to reduce the threat from catastrophes that could wipe out a single population (USFWS 2003). Support development of captive-breeding.

Citation: BirdLife International. 2016. Palmeria dolei. The IUCN Red List of Threatened Species 2016: e.T22720855A94686988. . Downloaded on 20 August 2018.
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