ʻAkohekohe

The ākohekohe (''Palmeria dolei''), or crested honeycreeper, is a species of Hawaiian honeycreeper. It is endemic to the island of Maui in Hawaii. The ʻākohekohe is susceptible to mosquito‐transmitted avian malaria (''Plasmodium relictum'') and only breeds in high‐elevation wet forests (> 1715 m).Wang, A.X. ''et al''. (2020
Divergent movement patterns of adult and juvenile ‘Akohekohe, an endangered Hawaiian Honeycreeper
''Journal of Field Ornithology''. https://doi.org/10.1111/jofo.12348

Description

The ākohekohe is the largest honeycreeper on Maui, at in length. The adults are a glossy black with whitish feathers and stripes going down its side. The underparts are whitish black while the top has orange feathers sticking from wings. The feathers behind the eyes are a reddish color, and have a stream of cream colored feathers coming from the eyes. One of the things that most people recognize about this bird is its whitish gold colored feather crest on its head. The younger birds are brownish black and they do not have the orange feathers of the parents. The legs and bills are a blackish color.

Song

It has a variety of songs. The most well known of the calls is a pair of ''whee-o, whee-o'', being repeated over and over again. Also another well known song is a descending thrill which is done about five seconds apart. It songs include a low chuckling sound, ''tjook, tjook, chouroup'' or a rarer song, ''hur-hur-hur-gluk-gluk-gluk''.

Diet

The ākohekohe is a nectarivore that feeds on the flowers of ''ōhia lehua'' ('' Metrosideros polymorpha'') high up in the canopy. It is an aggressive bird and will drive away competing nectarivores, such as the related ʻapapane and ʻiʻiwi. When ''ōhia lehua'' blossoms are limited, it will eat insects, fruit, and nectar from other plants. The ākohekohe will forage in the understory if necessary, where food plants include ākala ('' Rubus hawaiensis'').

Habitat and distribution

Its natural habitat is wet forests dominated by ''koa'' ('' Acacia koa'') and ''ōhia lehua'' ('' Metrosideros polymorpha'') on the windward side of Haleakalā at elevations of . During a search for the species in the east Maui forests, there were a record of 415 observations over an area of and at elevations from above sea level. It has been estimated that there are a total of 3,800 ākohekohe left on Maui in two populations separated by the Koolau Gap. They are sometimes but rarely seen at hosmer grove in Haleakalā National Park.

Threats

The ākohekohe currently survives only on Maui, but also lived on the eastern side of the island of Molokai until 1907. This bird was common on both islands at the start of the 20th century. It was thought to be extinct after that—however, in 1945 a small population was discovered in the National Area Reserve on Haleakalā in Maui. Over the course of the millennia, the population has decreased. The first human settlement of Hawai'i by Polynesians led to considerable habitat loss and ecological changes such as deforestation for human settlements and agriculture, particularly in lowland areas. The Polynesian rat (''Rattus exulans'') was also introduced to the islands at this time, which was a significant component of habitat loss and species decline. When Europeans arrived, the land and habitat loss and extinctions accelerated. Europeans brought with them two additional species of Rat, rats, which predated eggs, chicks, and adults of many bird species, and introduced ungulates which caused further deforestation. Another factor that lead to the decline of the ākohekohe was its unusual appearance, which made it desirable to collectors. In the mid-1800s, mosquitoes were introduced to the Hawaiian Islands, and later, mosquito-transmitted diseases such as avian malaria and avian pox. Mosquitoes, particularly ''Culex quinquefasciatus'', are vectors for these diseases. Hawaiian honeycreepers such as ''Palmeria dolei'' lack natural resistance to these pathogens and because of this avian malaria has a high mortality rate among Hawaiian honeycreepers. Humans also released Japanese white-eye in Hawaii, invasive birds which compete with Hawaiian honeycreeper, native birds for resources, and can also operate as vectors for avian malaria and other diseases to which they are resistant.

Conservation

According to the Federal Endangered Species Act, this bird is protected by law along with its habitat. The bird was included in the act in March 1967. It was also a part of many other documents including the Maui-Molokai Forest Bird Recovery Plan in 1967, by the Fish and Wildlife Service. It will serve as a guideline to protect the indigenous life of Maui and Molokai. The final recovery plan in 1984 continues the last, keeping eyes on the species and eradicating any ungulates that are introduced into the area that can harm and or disturb the ākohekohe and other native forest birds in Maui's forests.

References

External links

Species factsheet
- BirdLife International
Videos, photos and sounds
- Internet Bird Collection

{{DEFAULTSORT:Akohekohe
Hawaiian honeycreepers
Carduelinae
Endemic birds of Hawaii
Critically endangered fauna of Hawaii
Birds described in 1891
Taxa named by Scott Barchard Wilson
Taxonomy articles created by Polbot
ESA endangered species