Bahama oriole

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Bahama oriole
Bahama Oriole.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Icteridae
Genus: Icterus
Species: I. northropi
Binomial name
Icterus northropi
(J. A. Allen, 1890)

The Bahama oriole (Icterus northropi) is a species of songbird in the New World blackbird family - Icteridae. It is endemic to the Bahamas. It is listed as critically endangered by IUCN (CR). The taxon was originally classified as its own distinct species in 1890 by Joel Asaph Allen before it was lumped with the Cuban oriole (Icterus melanopsis), Hispaniolan oriole (Icterus dominicensis), and Puerto Rican oriole (Icterus portoricensis) into a single species by the ornithologist James Bond in his book "Birds of the West Indies". It wasn't until 2010 that all four birds were again elevated to full species status based on a combination of evidence from DNA, plumage and song.[2][3] As a result of it not being recognized as a distinct species for so long, the Bahama oriole's preferred non-breeding season habitat is unknown and current estimates of its exact numbers remain vague.

Historically, the Bahama oriole has been known only from two major islands in the Bahamas: Abaco and Andros. It became extirpated from Abaco in the 1990s, and today remains only on Andros in the Bahamas.[4] It can be found on the three major islands of Andros: North Andros, Mangrove Cay, and South Andros. It likely also occurs on some of the smaller cays, but current documentation is lacking. The species was recently recognized as Critically Endangered by Birdlife International,[5] with recent population estimates of 300 or fewer individuals remaining.[6][7]

The Bahama oriole's habitats during the breeding season include human residential areas, although there is recent evidence that they also use other habitats including pine and broadleaf "coppice" forest. Developed habitats are important for nesting since the species often uses introduced coconut palm (Cocos nucifera).[8] Birds also use the extensive Caribbean pine (Pinus caribaea) forest. Some nesting can occur in the pine forest, especially when the understory grows sufficiently to support native understory thatch palms, especially Leucothrinax morrisii. Though the general habitats of the Bahama oriole during the breeding season is known, the preferred habitat of the oriole during the non-breeding season is still unknown, although birds can be encountered in all terrestrial habitat types.[9]

The future of the Bahama oriole remains tenuous. The shiny cowbird (Molothrus bonariensis), a brood parasite that lays its eggs in the nests of other bird species, is naturally expanding its South American and West Indies range northward, and reached Andros in the mid-1990s.[10][11] Although still relatively uncommon, the cowbirds regularly parasitize the nests of orioles.[12][13] Also, many of the palms on North Andros, which the orioles preferentially select for nesting, are dying off because of lethal yellowing disease brought in with introduced palms.[14] As of 2017, lethal yellowing disease has not spread to Mangrove Cay or South Andros. The bigger threats, however, are continued habitat loss from human development, introduced predators (including cats, rats, dogs and hogs) and stochastic processes that, because of the oriole's small population size, increase the risk of extinction.

References[edit]

  1. ^ BirdLife International (2013). "Icterus northropi". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ Chesser, R. T., R. C. Banks, F. K. Barker, C. Cicero, J. L. Dunn, A. W. Kratter, I. J. Lovette, P. C. Rasmussen, J. V. Remsen, Jr, J. D. Rising , D. F. Stotz, and K. Winker. 2010. Fifty-first supplement to the American Ornithologists’ Union Check-list of North American Birds. Auk 127(3):726-744.
  3. ^ Omland, Kevin; Cant, Shelley; Johnson, Scott; Jeffery, Matt; Tschirky, John; Robertson, Holly; Price, Melissa; Sillett, Scott (2015). "Conservation Biology of the Critically endangered Bahama Oriole: Status, Threats, and Reversing the Decline". Bahamas Natural History Conference. 
  4. ^ White, J. W. 1998. A birder’s guide to the Bahama Islands (including Turks and Caicos). American Birding Association, Inc., Colorado Springs, Colorado.
  5. ^ http://www.birdlife.org/globally-threatened-bird-forums/wp-content/uploads/2011/02/Americas-2010-20112.xls
  6. ^ Price, M. R. and W. K. Hayes. 2009. Conservation taxonomy of the Greater Antillean Oriole (Icterus dominicensis): diagnosable plumage variation among allopatric populations supports species status. Caribbean Ornithology 22:19-25.
  7. ^ Price, M. R., V. Robinette, and W. K. Hayes. 2010. Population status and breeding ecology of the Bahama Oriole (Icterus dominicensis northropi). Pg. 75 in the COS/AOU/SCO Meeting Abstracts [1]
  8. ^ Price, M. R., V. Robinette, and W. K. Hayes. 2010. Population status and breeding ecology of the Bahama Oriole (Icterus dominicensis northropi). Pg. 75 in the COS/AOU/SCO Meeting Abstracts [2]
  9. ^ Omland, Kevin; Schulwitz, Sarah (2015). "Population Assessment of the Critically Endangered Bahama oriole: Status and Habitat usage During the Breeding and Non-Breeding Season". The Mohamed bin Zayed species Conservation Fund Application Form. 
  10. ^ Baltz, M. E. 1995. First records of Shiny cowbird (Molothrus bonariensis) in the Bahama Archipelago. Auk 112:1039-1041.
  11. ^ Baltz. M. E. 1996. The distribution and status of the Shiny Cowbird on Andros Island. Bahamas Journal of Science 3(2):2-5.
  12. ^ Baltz, M. E. 1997. Status of the Black-cowled Oriole (Icterus dominicensis northropi) in the Bahamas. Unpublished report to the Department of Agriculture, Nassau, Bahamas.
  13. ^ Price, M. R., V. Robinette, and W. K. Hayes. 2010. Population status and breeding ecology of the Bahama Oriole (Icterus dominicensis northropi). Pg. 75 in the COS/AOU/SCO Meeting Abstracts [3]
  14. ^ Price, M. R., V. Robinette, and W. K. Hayes. 2010. Population status and breeding ecology of the Bahama Oriole (Icterus dominicensis northropi). Pg. 75 in the COS/AOU/SCO Meeting Abstracts [4]