The bridled white-eye (''Zosterops conspicillatus'') (
Chamorro Chamorro may refer to:
* Chamorro people, the indigenous people of the Mariana Islands in the Western Pacific
* Chamorro language, an Austronesian language indigenous to The Marianas
* Chamorro Time Zone, the time zone of Guam and the Northern Mari ...
name: ''nosa'') was a species of
bird
Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...
in the family
Zosteropidae
The white-eyes are a family, Zosteropidae, of small passerine birds native to tropical, subtropical and temperate Sub-Saharan Africa, southern and eastern Asia, and Australasia. White-eyes inhabit most tropical islands in the Indian Ocean, the ...
. It was
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to the island of
Guam
Guam (; ch, Guåhan ) is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. It is the westernmost point and territory of the United States (reckoned from the geographic cent ...
in the
Mariana Islands
The Mariana Islands (; also the Marianas; in Chamorro: ''Manislan Mariånas'') are a crescent-shaped archipelago comprising the summits of fifteen longitudinally oriented, mostly dormant volcanic mountains in the northwestern Pacific Ocean, betw ...
. The species' natural
habitat
In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...
was subtropical or tropical moist lowland
forest
A forest is an area of land dominated by trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' ...
s.
One traditionally recognized subspecies is endemic to the
Northern Mariana Islands
The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands (CNMI; ch, Sankattan Siha Na Islas Mariånas; cal, Commonwealth Téél Falúw kka Efáng llól Marianas), is an unincorporated territory and commonw ...
, on the islands of
Tinian
Tinian ( or ; old Japanese name: 天仁安島, ''Tenian-shima'') is one of the three principal islands of the Commonwealth of the Northern Mariana Islands. Together with uninhabited neighboring Aguiguan, it forms Tinian Municipality, one of th ...
,
Saipan
Saipan ( ch, Sa’ipan, cal, Seipél, formerly in es, Saipán, and in ja, 彩帆島, Saipan-tō) is the largest island of the Northern Mariana Islands, a Commonwealth (U.S. insular area), commonwealth of the United States in the western Pa ...
and
Aguijan
Aguiguan (also Aguigan and Aguihan, based on the Spanish rendition of the native name, Aguijan, which is still used) is a small bean-shaped coralline island in the Northern Mariana Islands chain in the Pacific Ocean. It is situated south-west of ...
.
The nominate subspecies formerly occurred on the island of
Guam
Guam (; ch, Guåhan ) is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. It is the westernmost point and territory of the United States (reckoned from the geographic cent ...
, but is now considered
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
due to the invasive and predatory
brown tree snake
The brown tree snake (''Boiga irregularis''), also known as the brown catsnake, is an arboreal rear-fanged colubrid snake native to eastern and northern coastal Australia, eastern Indonesia (Sulawesi to Papua), Papua New Guinea, and many islands ...
. The last known sighting was in 1983.
The remaining subspecies, ''Z. (c.) saypani'', is separated as a full-species by some authorities. Until recently, this population was extremely abundant across its native range. 2007-2008 surveys estimated a population of 620,000-940,000, with approximately 534,000 birds on Saipan alone. In 2010, this species was the second most abundant breeding landbird encountered by surveyors on Saipan. The potential introduction of the brown tree snake on Saipan and
U.S. military
The United States Armed Forces are the military forces of the United States. The armed forces consists of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. The president of the United States is the ...
activity on Tinian are expected to result in rapid population declines on these islands, which constitutes over 50% of this bird's range.
A survey into the impacts these have had on the wild populations has not yet been conducted, but as a precautionary measure the species has been classified as
endangered
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inva ...
.
The Saipan white-eye has a
captive breeding program
Captive breeding, also known as captive propagation, is the process of plants or animals in controlled environments, such as wildlife reserves, zoos, botanic gardens, and other conservation facilities. It is sometimes employed to help species that ...
based at the
Sedgwick County Zoo
The Sedgwick County Zoo is an AZA-accredited wildlife park and major attraction in Wichita, Kansas, United States. Founded in 1971, with the help of the Sedgwick County Zoological Society, the zoo has quickly become recognized both nationally ...
and
National Aviary
The National Aviary, located in Pittsburgh, Pennsylvania, Pittsburgh, Pennsylvania, is the only independent indoor nonprofit aviary in the United States. It is also the country's largest aviary, and the only one accorded honorary "National" statu ...
.
Formerly, the
Rota white-eye was also considered as a subspecies of the bridled white-eye.
References
bridled white-eye
The bridled white-eye (''Zosterops conspicillatus'') (Chamorro name: ''nosa'') was a species of bird in the family Zosteropidae. It was endemic to the island of Guam in the Mariana Islands. The species' natural habitat was subtropical or tropica ...
Birds of the Northern Mariana Islands
bridled white-eye
The bridled white-eye (''Zosterops conspicillatus'') (Chamorro name: ''nosa'') was a species of bird in the family Zosteropidae. It was endemic to the island of Guam in the Mariana Islands. The species' natural habitat was subtropical or tropica ...
Taxa named by Heinrich von Kittlitz
Taxonomy articles created by Polbot
{{Zosteropidae-stub