Myadestes lanaiensis

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	AVES	PASSERIFORMES	TURDIDAE

Scientific Name:

Myadestes lanaiensis

Species Authority:

(Wilson, 1891)

Common Name/s:

English

–

Hawaiian Thrush, Olomao, Oloma'o

Assessment Information [top]

Red List Category & Criteria:

Critically Endangered D ver 3.1

Year Assessed:

2009

Assessor/s:

BirdLife International

Reviewer/s:

Symes, A., Butchart, S., Bird, J.

Contributor/s:

Baker, P., Camp, R., Baker, H., Lepson, J., Fretz, J., Gorresen, M., Woodworth, B., VanderWerf, E., Wakelee, K.

Justification:
The last well-documented sighting of this species was in 1980, with an unconfirmed report in 1988, and no subsequent records despite further surveys in most of the historical range in Kamakou-Pelekunu. It may have been driven extinct by disease spread by introduced mosquitoes, and as a result of habitat destruction. However, it cannot yet be presumed to be Extinct because the remote Oloku`i Plateau has not been resurveyed recently and could conceivably still harbour some birds. Any remaining population is likely to be tiny, and for these reasons it is treated as Critically Endangered (Possibly Extinct).

History:

2008	–	Critically Endangered
2004	–	Critically Endangered
2000	–	Critically Endangered
1996	–	Critically Endangered
1994	–	Critically Endangered

Geographic Range [top]

Range Description:	Myadestes lanaiensis is endemic to the central Hawaiian Islands (USA), where it is (or was) known from Maui, Lana`i and Moloka`i. It had been extirpated from Maui before ornithologists arrived, but possibly survived until the mid-19th century², and was last seen on Lana`i in 1933. Most of the historical range on Moloka`i in Kamakou-Pelekunu has been resurveyed and the species has probably been extirpated from that area^9,10; the last well-documented record from Moloka`i was in 1980. However, it cannot yet be presumed to be Extinct because the remote Oloku`i Plateau has not been resurveyed recently and could conceivably still harbour some birds. 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 assumed to be tiny, with no records (confirmed or otherwise) since the late 1980s
Population Trend:	Unknown

Population:

Any remaining population assumed to be tiny, with no records (confirmed or otherwise) since the late 1980s

Population Trend:

Unknown

Habitat and Ecology [top]

Habitat and Ecology:	It is a shy and retiring bird of the montane forest canopy, although in the late 1800s it was reported as ubiquitous in forests from the lowlands to the higher elevations on Moloka`i and Lana`i^6,7. Like its congeners, it is primarily frugivorous^7,8.
Systems:	Terrestrial

Threats [top]

Major Threat(s):	This species's drastic decline is probably attributable to the introduction of disease-carrying mosquitoes and habitat destruction. Mosquitoes were, until recently, restricted to the lowlands, but have followed the penetration of feral pigs into remote native rainforests over the last 25 years⁴, and Moloka`i's uplands are probably too small to provide disease-free refugia. Pigs also modify native forests as they carry alien weeds to new areas and their rooting destroys the shrub layer⁴, and introduced axis deer Axis axis are an additional problem³.

Major Threat(s):

This species's drastic decline is probably attributable to the introduction of disease-carrying mosquitoes and habitat destruction. Mosquitoes were, until recently, restricted to the lowlands, but have followed the penetration of feral pigs into remote native rainforests over the last 25 years⁴, and Moloka`i's uplands are probably too small to provide disease-free refugia. Pigs also modify native forests as they carry alien weeds to new areas and their rooting destroys the shrub layer⁴, and introduced axis deer Axis axis are an additional problem³.

Conservation Actions [top]

Conservation Actions:	Conservation Actions Underway The Kamakou Preserve and neighbouring land have been partially fenced and control programmes exist for feral ungulates¹. The Oloku`i Natural Area, established in 1986, protects pristine native forest⁶ where M. lanaiensis may persist⁷. Should it be rediscovered, consideration should be given to establishing a captive population at high elevation on East Maui, where the habitat is relatively intact and free of threat from mosquitoes and avian disease¹¹. Conservation Actions Proposed Conduct surveys to locate any remaining populations and, if found, urgently assess action required for its recovery.

Conservation Actions:

Conservation Actions Underway
The Kamakou Preserve and neighbouring land have been partially fenced and control programmes exist for feral ungulates¹. The Oloku`i Natural Area, established in 1986, protects pristine native forest⁶ where M. lanaiensis may persist⁷. Should it be rediscovered, consideration should be given to establishing a captive population at high elevation on East Maui, where the habitat is relatively intact and free of threat from mosquitoes and avian disease¹¹.

Conservation Actions Proposed
Conduct surveys to locate any remaining populations and, if found, urgently assess action required for its recovery.

Citation:	BirdLife International 2009. Myadestes lanaiensis. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 09 February 2012.
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