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Oʻahu ʻelepaio
Conservation status
Vulnerable  (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Passeriformes
Family:	Monarchidae
Genus:	Chasiempis
Species:	C. ibidis
Binomial name
Chasiempis ibidis Stejneger, 1887
Synonyms
Chasiempis sandwichensis ibidis

The Oʻahu ʻelepaio (Chasiempis ibidis) is a monarch flycatcher found on the Hawaiian Island of Oahu.

Taxonomy

The Oʻahu ʻelepaio was formerly considered a subspecies of the Hawaii ʻelepaio until reclassified as a separate species in 2010.

Description

This species looks very similar to the Hawaiʻi ʻelepaio, but the white underside extends to the flanks and further up the breast, and the upper side – especially the head – is more rust-colored.

Threats

Avian malaria and fowlpox are widespread in the population and although it appears to have weathered the worst of it, it is threatened by a combination of these diseases and predation of nestlings, eggs and adult females by rats. In areas where rats are controlled, survival and nest success are higher.

It is now restricted to an area of 47 square kilometers (18 sq mi) in the Koʻolau and Waiʻanae ranges, where a fragmented population of 1,200–1,400 birds occurs. It is listed as endangered. Recently completed surveys of populations in the Koʻolau range have unexpectedly revealed that the population has largely remained stable since surveys conducted in the 1990s. However, only about 20 individuals are left on the windward side of the Koʻolau range, with some valleys containing only a single ʻelepaio. Without intervention, the population risks extinction due to its small population.

References

1. BirdLife International (2016). "Chasiempis ibidis". IUCN Red List of Threatened Species. 2016: e.T22736423A95133622. doi:10.2305/IUCN.UK.2016-3.RLTS.T22736423A95133622.en. Retrieved 19 November 2021.
2. "Species Version 2 « IOC World Bird List". www.worldbirdnames.org. Retrieved 2016-10-26.

• Conant, S. (1977): The breeding biology of the Oahu ʻElepaio. Wilson Bull. 89(2): 193–210. DjVu fulltext PDF fulltext
• VanderWerf, Eric A.; Rohrer, Joby L.; Smith, David G. & Burt, Matthew D. (2001): Current distribution and abundance of the Oʻahu ʻElepaio. Wilson Bull. 113(1): 10–16. DOI:10.1676/0043-5643(2001)1132.0.CO;2 HTML abstract
• VanderWerf, Eric A.; Burt, Matthew D.; Rohrer, Joby L. & Mosher, Stephen M. (2006): Distribution and prevalence of mosquito-borne diseases in Oʻahu ʻElepaio . Condor 108(4): 770–777. DOI:10.1650/0010-5422(2006)1082.0.CO;2 HTML abstract

External links

• Species Factsheet - BirdLife International

• IUCN Red List vulnerable species
• Chasiempis
• Endemic birds of Hawaii
• Biota of Oahu
• Endangered fauna of Hawaii
• Birds described in 1887
• ESA endangered species