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Puaiohi Myadestes palmeri
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Justification
This species qualifies as Critically Endangered because it has an extremely small range, wholly confined to one upland area where habitat quality is continuing to decline. It has apparently always been rare, although the reasons for this are unclear and the range and population trends are difficult to judge, because it is extremely elusive, and occurs in some areas that are difficult to access. Reintroduction of captive-bred individuals has however led to a significant population increase and if declines in habitat quality are halted the species may be eligible for downlisting in the future.

Taxonomic source(s)
AOU. 1998. Check-list of North American birds. American Ornithologists' Union, Washington, D.C.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Identification
17 cm. Small, dark thrush. Adult dark brown above, medium grey below, with pale eye-ring, dark moustachial streak and pale throat. Pink legs and feet. Juvenile heavily spotted above, buff below, scalloped with dark brown. Similar spp. Kama'o M. myadestinus larger, plumper, with shorter, heavier bill and dark legs. Introduced Melodious Laughingthrush Garrulax canorus brighter cinnamon-brown with yellow bill. Voice Song a short, sneezy burst of high, liquid trill notes. Call a short rasping hiss. Hints Secretive, but can be found occasionally on Alaka`i Swamp Trail near Koke`e.

Distribution and population
Myadestes palmeri is endemic to Kaua`i in the Hawaiian Islands (USA), where recent records are all from the Alaka`i Wilderness Preserve. It was lost from the Waiau and possibly the Halekua drainages (T. Snetsinger per P. Donaldson in litt. 1999), but may be expanding its range in the Mohihi drainage (Snetsinger et al. 1999). It formerly occurred in lowland habitats, but probably only locally, and was extirpated from these areas by the end of the 19th century (J. Lepson in litt. 1999, Snetsinger et al. 1999, Burney et al. 2001). During 1998-2000, the population was estimated at c.200, possibly up to 300, wild individuals (Lieberman and Kuehler 1998, Conrow 1999,  Snetsinger et al. 1999, T. Snetsinger in litt. 2000), and more recently estimated at 500 individuals (range 200-1,000) in 2010 (KFBRP unpubl. data, in Puaiohi Working Group and Hawaiian Forest Bird Recovery Team 2010).. Few birds were detected after two hurricanes in the 1990s, but the population size is thought to have recovered to pre-hurricane numbers (Pratt 1994, Conant et al. 1998, Snetsinger et al. 1999). A captive breeding programme began in 1996 and has facilitated the successful reintroduction of individuals into the wild annually since 1999, with 200 birds released as of 2010 (Puaiohi Working Group and Hawaiian Forest Bird Recovery Team 2010), resulting in successful breeding in the wild by captive-bred birds, although no known new subpopulations have yet been permanently established.


Population justification
The population was estimated at 500 individuals (range 200-1,000) in 2010, roughly equivalent to 130-670 mature individuals (KFBRP unpubl. data, in Puaiohi Working Group and Hawaiian Forest Bird Recovery Team 2010). Previous estimates, derived from Conrow (1999), Lieberman & Kuehler (1998), Snetsinger et al. (1999), T. Snetsinger in litt. (2000), and P. Roberts in litt. (2007) totalled 200-500 individuals, roughly equivalent to 130-330 mature individuals.

Trend justification
Thanks to a captive breeding and reintroduction programme in the Alaka'i Wilderness Preserve, the species has more than doubled its population over three generations (13.5 years).

Ecology
It is now restricted to high-elevation `ohi`a forests. It is a ravine specialist, favouring stream banks with a rich understorey (Kepler and Kepler 1983, Scott et al. 1986, Conant et al. 1998). Many recorded nests have been placed in cliffs above streams. It is primarily frugivorous, with arthropods (particularly insects) forming an important dietary component (Kepler and Kepler 1983, Scott et al. 1986, Snetsinger et al. 1999). At least one bird died after malaria infection in the wild, but some birds may be disease resistant (Herrmann and Snetsinger 1997, Snetsinger et al. 1999). Breeding is typically between March and August. It has potentially high but variable productivity, with pairs producing 0.4 to 4.9 young per year in three years of observation (Snetsinger et al. 1999). It is now the sole native frugivore on Kauai, and probably plays a major role in seed dispersal within its range.

Threats
The destruction of the understorey by feral pigs has been implicated in this species's rarity (Kepler and Kepler 1983). Avian pox-like lesions have been observed on a mist-netted bird (Herrmann and Snetsinger 1997), and avian malaria is suspected to cause some mortality (Snetsinger et al. 1999, K. Wakelee in litt. 1999). Currently, there are no forested areas on Kaua‘i where the mean ambient temperature prevents the seasonal incursion of malaria; mosquitoes and malaria can survive across all parts of the island, at least periodically. An increase in temperature of 2° C would result in an 85 % decrease in the land area on Kaua‘i where malaria transmission currently is only periodic (Benning et al. 2002). Between 2007-2009, 56 wild Puaiohi were tested for malaria and 11 (19.6%) were determined to be infected, an increase on 1 bird in 7 between 1994-1997 (Atkinson and Utzurrum 2010, in Puaiohi Working Group and Hawaiian Forest Bird Recovery Team 2010). At least three captive birds that died soon after release were determined to be infected with malaria. Thus, disease may limit Puaiohi from inhabiting low elevation areas with suitable nesting habitat.

Although hurricanes have caused serious damage to its habitat, the species appears to recover relatively well, probably because ravines are better sheltered (Conant et al. 1998, Snetsinger et al. 1999). Predation by native Short-eared Owls Asio flammeus and alien mammals (e.g. rats) suppresses productivity and competition for food with introduced insects, birds and mammals may also have negative impacts (Snetsinger et al. 1999, Snetsinger et al. 2005). Several plants, including blackberry (Rubus argutus), Australian tree fern (Cyathea cooperi), Kahili ginger (Hedychium gardnerianum) daisy fleabane (Erigeron annuus) and strawberry guava (Psidium cattleianum) have significantly altered areas currently and recently occupied by Puaiohi, and have the potential to convert the forest canopy, understorey and cliffs used for nesting substrate to unsuitable habitat (P. Roberts in litt. 2007).


Conservation Actions Underway
It is protected in the Alaka`i Wilderness Preserve. Rat poison bait stations have placed near a few nests with moderate success (Snetsinger et al. 1999). Bait stations are also placed around the release sites for captive-bred individuals at the time of release. Several types of rodent-resistant nest boxes have been installed in nesting habitat, and one pair was documented to nest successfully in one box. Control of feral ungulates has proved difficult in less accessible areas of the Alaka`i Wilderness Preserve, which is rarely visited by hunters, and alternatives are expensive and of limited effectiveness (USFWS 2003). An ungulate exclusion fence is planned for a portion of the Alaka'i plateau, which will include 5-10% of the species's range. A captive population was established in 1996, and 14 birds were released into the wild in 1999 (Lieberman and Kuehler 1998, Conrow 1999, USGS News Release 1999, T. Snetsinger in litt. 2000), with releases continuing subsequently and 200 birds released as of 2010 (Puaiohi Working Group and Hawaiian Forest Bird Recovery Team 2010). The captive-bred birds have bred with each other and with wild birds (USGS News Release 1999). Results of the releases have been mixed, with birds released in 1999-2001 surviving better than birds released from 2002-2006. The release strategy for 1999-2001 was highly successful, with 31 out of 34 released birds surviving at least one month after release and confirmed breeding occurring in the wild (USFWS 2003). From 2002 through 2007, roughly half of released birds survived for one month or longer. Research on the factors limiting the species and the potential of management actions is ongoing. Conservation Actions Proposed
Develop a species-specific survey method and resurvey the entire population, searching for captive released birds and for areas of suitable unoccupied habitat. Determine disease prevalence and factors promoting transmission of avian pox and malaria, and explore disease management options. Conduct research to determine the impacts of predation and habitat degradation by alien species. Begin the process of phasing out the captive release programme. Continue and expand outreach. Investigate feasibility of translocations to higher islands (Puaiohi Working Group and Hawaiian Forest Bird Recovery Team 2010).

References
Benning, T. L.; LaPointe, D.; Atkinson, C. T.; Vitousek, P. M. 2002. Interactions of climate change with biological invasions and land use in the Hawaiian Islands: modeling the fate of endemic birds using a geographic information system. Proceedings of the National Academy of Sciences of the United States of America 99(22): 14246-14249.

Burney, D. A.; James, H. F.; Burney, L. P.; Olson, S. L.; Kikuchi, W.; Wagner, W. L.; Burney, M.; McCloskey, D.; Kikuchi, D.; Grady, F. V.; Gage II, R.; Nishek, R. 2001. Fossil evidence for a diverse biota from Kaua’i and its transformation since human arrival. Ecological Monographs 71(4): 615-641.

Conant, S.; Pratt, H. D.; Shallenberger, R. J. 1998. Reflections on a 1975 expedition to the lost world of the Alaka'i and other notes on the natural history, systematics, and conservation of Kaua'i birds. Wilson Bulletin 110: 1-22.

Conrow, J. 1999. Born to be wild. Audubon 101: 64-71.

Herrmann, C. M.; Snetsinger, T. J. 1997. Pox-like lesions on endangered Puaiohi Myadestes palmeri and occurrence of mosquito Culex quinquefasciatus populations near Koaie Stream. 'Elepaio 57: 73-75.

Hirschfeld, E. 2008. Rare Birds Yearbook 2009: the world's 190 most threatened birds. MagDig Media Ltd., Shrewsbury, UK.

Kepler, C. B.; Kepler, A. K. 1983. A first record of the nest and chicks of the small Kauai Thrush. Condor 85: 497-499.

Lieberman, A.; Kuehler, C. 1998. First captive breeding of the endangered Small Kauai Thrush (Puaiohi) Myadestes palmeri. Bird Conservation International 8: 206.

Pratt, H. D. 1994. Avifaunal change in the Hawaiian Islands, 1893-1993. Studies in Avian Biology 15: 103-118.

Puaiohi Working Group and Hawaiian Forest Bird Recovery Team. 2010. Puaiohi Five-year Recovery Work Plan 2010 - 2015. Available at: kauaiforestbirds.org/index.php/download_file/view/535/68/. (Accessed: 07/10/2013).

Scott, J. M.; Mountainspring, S.; Ramsey, F. L.; Kepler, C. B. 1986. Forest bird communties of the Hawaiian Islands: their dynamics, ecology, and conservation. Cooper Ornithological Society, California.

Snetsinger, T. J.; Wakelee, K. M.; Fancy, S. G. 1999. Puaiohi (Myadestes palmeri). In: Poole, A.; Gill, F. (ed.), The birds of North America, No. 461, pp. 1-20. The Birds of North America, Inc., Philadelphia.

Snetsinger, T.J.; Herrmann, C.M.; Holmes, D.E.; Hayward, C.D.; Fancy, S. G. 2005. Breeding ecology of the Puaiohi (Myadestes palmeri). Wilson Bulletin 117: 72-84.

U.S. Fish and Wildlife Service. 2005. Rare Hawaiian bird released on Kaua'i. 'Elepaio 65: 14-15.

United States Geological Survey. 1999. A First: Endangered Puaiohi Birds Fledge Four Chicks in the Wild. http://www.usgs.gov/newsroom/article.asp?ID=1305.

Further web sources of information
Alliance for Zero Extinction (AZE) species/site profile. This species has been identified as an AZE trigger due to its IUCN Red List status and limited range.

Audubon WatchList

Click here for more information about the Alliance for Zero Extinction (AZE)

Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

U.S. Fish and Wildlife Service - Revised Recovery Plan for Hawaiian Forest Birds 2006

Text account compilers
Benstead, P., Bird, J., Derhé, M., Harding, M., Isherwood, I., Stattersfield, A., Stuart, T. & Symes, A.

Contributors
Camp, R., Donaldson, P., Fretz, J., Gorresen, M., Leonard, D., Lepson, J., Roberts, P., Scott, J., Snetsinger, T., VanderWerf, E., Wakelee, K. & Woodworth, B.

Recommended citation
BirdLife International (2014) Species factsheet: Myadestes palmeri. Downloaded from http://www.birdlife.org on 26/07/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 26/07/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Puaiohi (Myadestes palmeri) 0

Key facts
Current IUCN Red List category Critically Endangered
Family Turdidae (Thrushes)
Species name author (Rothschild, 1893)
Population size 130-670 mature individuals
Population trend Increasing
Distribution size (breeding/resident) 32 km2
Country endemic? Yes
Links to further information
- Additional Information on this species