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This species qualifies as Endangered because it has undergone a rapid population decline, presumably owing to pesticide-use and predation by the introduced brown tree snake Boiga irregularis on Guam. Furthermore, a very rapid decline is expected following establishment of the brown tree snake on Saipan, its stronghold.
AOU. 1998. Check-list of North American birds. American Ornithologists' Union, Washington, D.C.
Collocalia inquieta (Sibley and Monroe 1990, 1993) has been split into C. bartschi following Browning (1993) and AOU (1998) and C. inquieta following Browning (1993).
Aerodramus bartschi AOU checklist (1998 + supplements), Aerodramus bartschi bartschi AOU checklist (1998 + supplements)
11 cm. Swiftlet with dark greyish-brown upperparts and head. Silvery grey-white throat and upper breast. Remainder of underparts darker and greyer. Shallow fork-tail. Plumage lacks any noticeable sheen. Voice Chirps and twitterings. Makes echolocation clicks inside caves.
Browning, M. R. 1993. Species limits of the cave swiftlets (Collocalia) in Micronesia. Avocetta 17: 101-106.
Chantler, P.; Driessens, G. 1995. Swifts: a guide to the swifts and treeswifts of the world. Pica Press, Robertsbridge, U.K.
Engbring, J.; Ramsey, F. L.; Wildman, V. J. 1982. Micronesian forest bird survey, 1982: Saipan, Tinian, Agiguan, and Rota. U.S. Fish and Wildlife Service, Honolulu.
Grimm, G. 2008. Mariana swiftlet surveys on Naval Munitions Site, Guam. U.S. Navy, NAVFAC Marianas, Guam.
Jenkins, J. M. 1983. The native forest birds of Guam. American Ornithologists' Union, Washington, D.C.
Kohley, C. R.; Kershner, E. L.; Kremer, S. 2006. The assessment of the diet of the endangered Mariana Swiftlet. Wings without borders: IV North American Ornithological Conference, October 3-7 2006, Veracruz, Mexico, pp. 177. American Ornithologists' Union, Waco, TX, U.S.A.
Lee, L. M.; Clayton, D. H.; Griffiths, R.; Page, R. D. M. 1996. Does behavior reflect phylogeny in swiftlets (Aves: Apodidae)? A test using cytochrome-b mitochondrial DNA sequences. Proceedings of the National Academy of Sciences of the United States of America 93: 7091-7096.
Morton, J. M.; Amidon, F. A. 1996. Development of field techniques for studying and restoring the Vanikoro Swiftlet (Aerodramus vanikorensis bartschi) on Guam.
Wiles, G. J.; Woodside, D. H. 1999. History and population status of guan swiftlets on O'ahu, Hawai'i. 'Elepaio 59: 57-61.
Further web sources of information
View photos and videos, and hear sounds of this species from the Internet Bird Collection
Text account compilers
Derh, M., Mahood, S., O'Brien, A., Stattersfield, A.
Cruz, J., Saunders, A., Wiles, G.
IUCN Red List evaluators
Butchart, S., Symes, A.
BirdLife International (2013) Species factsheet: Collocalia bartschi. Downloaded from http://www.birdlife.org on 04/12/2013. Recommended citation for factsheets for more than one species: BirdLife International (2013) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/12/2013.
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.
|Current IUCN Red List category||Endangered|
|Species name author||Mearns, 1909|
|Population size||2100-2300 mature individuals|
|Distribution size (breeding/resident)||730 km2|
|Links to further information|
|- Additional Information on this species|