Biology:Gouldian finch

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Short description: Passerine bird native to Australia

Gouldian finch
Male adult Gouldian Finch.jpg
Adult red-headed male
Scientific classification edit
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Estrildidae
Genus: Chloebia
Reichenbach, 1862
Species:
C. gouldiae
Binomial name
Chloebia gouldiae
(Gould, 1844)
Gouldian Finch.png
Distribution
Synonyms[2]
  • Ramsay Gould, 1844
  • (Gould, 1844) Poephila mirabilis
  • Amadina gouldiae Des Murs
  • Poephila armitiana Chloebia gouldiae

The Gouldian finch (Chloebia gouldiae), also known as the Gould's finch or the rainbow finch, is a colourful passerine bird that is native to Australia .

Taxonomy

The Gouldian finch was described by British ornithologist John Gould in 1844 as Amadina gouldiae,[2] in honour of his deceased wife Elizabeth.[3][4] Specimens of the bird were sent to him by British naturalist Benjamin Bynoe, although they had been described some years before by French naturalists Jacques Bernard Hombron and Honoré Jacquinot.[5] It is also known as the rainbow finch, Gould's finch, or sometimes just Gould.[6] The Gouldian finch is sister to the parrotfinches in the genus Erythrura.[7]

Description

Both sexes are brightly coloured with black, green, yellow, and red markings. The females tend to be less brightly colored. One major difference between the sexes is that the male's chest is purple, while the female's is a lighter mauve.[8]

Gouldian finches are about 125–140 mm long.[9] Gouldian finches' heads may be red, black, or yellow. Formerly considered three different kinds of finches, it is now known that these are colour variants of one species that exist in the wild.[10] Selective breeding has also developed mutations (blue, yellow and silver instead of a green back) in both body and breast colour.[11]

There are several "prominent rounded tubercles" with an "opalescent lustre" at the back of the gape. These tubercles are commonly (and incorrectly) described as phosphorescent in spite of much scientific evidence to the contrary.[12] It is believed that these tubercles simply reflect light and are not luminescent.[12]

Distribution and habitat

Black-headed male Gouldian finch

Gouldian finches are native to northern Australia,[13] in particular the Kimberley and Northern Territory.[14]

Prior to the Australian government's ban on the export of Australian fauna,[15] Gouldian finches were exported worldwide, which has resulted in viable captive breeding populations being held in many countries.[citation needed]

Conservation status

The number of Gouldian finches in the wild decreased dramatically in the 20th century due to human-caused habitat loss.[16][14] The population went from hundreds of thousands in the early 20th century to 2,500 or fewer by the 1980's.[16] The current estimated population continues to be 2,500 or fewer birds.[14] Early research suggested that a parasite called the air sac mite was responsible for the species' decline, but the mite is no longer considered a major factor.[citation needed] The primary threat to wild Gouldian finch populations is an increase in extensive wildfires in the late dry season of its native habitat, which negatively impacts the availability of both tree hollows for breeding, and the seeds that comprise the bulk of the Gouldian finch's diet.[14][17] Cyclones and climate change have also negatively impacted tree hollow availability in the Northern Territory.[18]

Behaviour

Outside the breeding season, Gouldian finches often join mixed flocks consisting of long-tailed finches and masked finches. Flocks can consist of up to 1,000–2,000 individuals.[19][20] During the breeding season, they are normally found on rough scree slopes where vegetation is sparse. In the dry season, they are much more nomadic and will move to wherever their food and water can be found.[20]

Feeding

Like other finches, the Gouldian finch is a seed eater. They eat up to 30% of their bodyweight each day.[21] During the breeding season, Gouldian finches mainly feed on ripe and half-ripe grass seeds of sorghum. During the dry season, they mainly forage on the ground for seeds. During the wet season, spinifex grass seed (Triodia sp.) is an important part of their diet. So far Gouldians have been recorded eating six different species of grass seed, but researchers have yet to find evidence of insect consumption.[22]

Breeding

Newly-hatched Gouldian finch chicks
A young Gouldian finch (first day out of the nest) – note the blue nodules on the side of its beak

Gouldian finches will usually make their nests in tree hollows. They usually breed in the early part of the dry season, when there is plenty of food available.[23] When a male is courting a female, he bobs about and ruffles his feathers in an attempt to show off his bright colors. He will expand his chest and fluff out the feathers on his forehead. After mating, the female will lay a clutch of about 4–8 eggs. Both parents help brood the eggs during the daytime, and it is the female who stays on the eggs at night. When the eggs hatch, both parents care for the young. Gouldian finches leave the nest after between 19 and 25 days and are completely independent at 40 days old.[23]

Gouldian finches have brightly coloured gapes and call loudly when the parent birds return so that they are able to find and feed their mouths in the dark nest.[24]

It has been shown that female Gouldian finches from Northern Australia can control the sex of their offspring by choosing mates according to their head color. A certain amount of genetic incompatibility between black and red-headed birds can result in high mortality (up to 80%) in female offspring when birds of different head colours mate. If the female mates with a finch of different head colour, this genetic incompatibility can be addressed by over-producing sons, up to a ratio of four males to one female. This is one of the first proven instances of birds biasing the sex of their offspring to overcome genetic weaknesses.[25][26]

Aviculture

Gouldian finches are a popular species in aviculture because of their striking colors and low care requirements.[23] Gouldian finches get along well with other species of grass finch and some other docile species of bird, such as waxbills and parrot finches.[27]

Trapping for aviculture

In the Kimberley District of Western Australia, where most wild Gouldian finch were trapped for aviculture, it was often reported as one of the more common of the eleven finch species. Until 1977, it was trapped in greater numbers than any other finch. From 1897, when finch trapping started in the Kimberley, it was the most sought after finch by trappers and the most desired by fanciers. Between the years 1934 and 1939, the Gouldian finch was the most exported single finch species. The Perth Zoo exported 22,064 finches of which 12,509 were Gouldian. Private dealers exported 35,315 finches, of which 14,504 were Gouldian. The number of finches taken in the 1958 finch trapping season was the largest for one year, of the 38,649 finches taken, 11,286 were Gouldian. The last licensed trapping of Gouldian finch in Western Australia was on 15 November 1981. In that year's finch trapping season, of the 23,450 finches taken 1,054 were Gouldian.[28] However, it is now illegal to export these birds from Australia.[29]

In popular culture

The Gouldian finch is used as the basis of the ViewSonic logo.[30]

Gallery

  • Black-headed female Gouldian finch

  • Red headed male Gouldian finch at Artis Zoo, Netherlands

  • A juvenile at Cincinnati Zoo

  • A young Gouldian finch with the beginnings of bright adult plumage

  • Two Gouldian finches eating birdseed

Gouldian finch mutations

  • White Gouldian finch and yellow Gouldian finch mutation

  • White-breasted yellow-headed Gouldian finch (left) and black-headed male Gouldian finches

  • Adult male double factor yellow back Gouldian finch

References

  1. ↑ BirdLife International (2022). "Chloebia gouldiae". IUCN Red List of Threatened Species 2022: e.T22719744A211561819. https://www.iucnredlist.org/species/22719744/211561819. Retrieved 22 July 2022. 
  2. ↑ 2.0 2.1 Australian Biological Resources Study (6 May 2016). "Species Erythrura (Chloebia) gouldiae (Gould, 1844)". Australian Faunal Directory. Canberra, Australian Capital Territory: Department of the Environment, Water, Heritage and the Arts, Australian Government. https://biodiversity.org.au/afd/taxa/Erythrura_%28Chloebia%29_gouldiae. 
  3. ↑ "The Goulds, John Gould (1804–1881)". Avicultural Review (The Avicultural Society of New South Wales (ASNSW)) 15 (1). January 1998. http://aviculturalsocietynsw.org/_inMemoriam/GouldJohn1804-1881.htm. 
  4. ↑ "Part 1: An introduction to the Gouldian finch – Planet Aviary" (in en-GB). https://planetaviary.com/part-1-an-introduction-to-the-gouldian-finch/. 
  5. ↑ "Gouldian Finch discovery". http://www.gouldianfinches.eu/en/ethology/discovering-and-characterisation-of-species/. 
  6. ↑ "The Gouldian Finch – Chloebia gouldiae". http://www.efinch.com/species/gould.htm. 
  7. ↑ Olsson, Urban; Alström, Per (2020). "A comprehensive phylogeny and taxonomic evaluation of the waxbills (Aves: Estrildidae)". Molecular Phylogenetics and Evolution 146: 106757. doi:10.1016/j.ympev.2020.106757. PMID 32028027. 
  8. ↑ "Gouldian finch - Erythrura gouldiae - ARKive". 29 January 2009. http://www.arkive.org/gouldian-finch/erythrura-gouldiae/. 
  9. ↑ "Gouldian Finch Identification – Gouldian Finch" (in en). http://www.diamante-de-gould.com/en/caracteristicas/identificacion.html. 
  10. ↑ Southern H.N. (1945). "Polymorphism in Poephila gouldiae". J. Genet. 47: 51–157. doi:10.1007/BF02989037. http://www.ias.ac.in/jarch/jgenet/47/51.pdf. 
  11. ↑ "Gouldian Finch colour mutations". https://finchstuff.com/gouldianmutations. 
  12. ↑ 12.0 12.1 McAtee W.L. (July 1947). "Luminosity in Birds". American Midland Naturalist 38 (1): 207–213. doi:10.2307/2421636. 
  13. ↑ Cox, Lisa (2022-09-04). "Tanya Plibersek urged to save Gouldian finches from NT defence development" (in en-GB). The Guardian. ISSN 0261-3077. https://www.theguardian.com/environment/2022/sep/05/tanya-plibersek-urged-to-save-gouldian-finches-from-nt-defence-development. 
  14. ↑ 14.0 14.1 14.2 14.3 "Gouldian finch – WWF-Australia". http://www.wwf.org.au/what-we-do/species/gouldian-finch#gs.SRXFq2I. 
  15. ↑ "Department of the Environment and Energy" (in en). http://environment.gov.au/biodiversity/wildlife-trade/natives/exporting-live-australian-natives. 
  16. ↑ 16.0 16.1 Tidemann, Sonia C. (March 1996). "Causes of the decline of the Gouldian Finch Erythrura gouldiae" (in en). Bird Conservation International 6 (1): 49–61. doi:10.1017/S0959270900001301. 
  17. ↑ "Australian Wildlife Conservancy" (in en). http://www.australianwildlife.org/wildlife/gouldian-finch.aspx. 
  18. ↑ Abbatangelo, Ben (2023-07-11). "Binybara is not just home to the Gouldian finch. It's part of the Larrakia nation. And it deserves protection" (in en-GB). The Guardian. ISSN 0261-3077. https://www.theguardian.com/commentisfree/2023/jul/11/binybara-is-not-just-home-to-the-gouldian-finch-its-part-of-the-larrakia-nation-and-it-deserves-protection. 
  19. ↑ "Gouldian Finch | Pets4Homes" (in en). Pets4Homes. https://www.pets4homes.co.uk/pet-advice/gouldian-finch.html. 
  20. ↑ 20.0 20.1 "Gouldian Finches or Rainbow Finches | Beauty of Birds" (in en). https://www.beautyofbirds.com/gouldianfinch.html#distribution. 
  21. ↑ "Lady Gouldian Finch Diet Feeding Guide". https://www.lady-gouldian-finch-breeding-expert-guide.com/lady-gouldian-finch-diet-feeding.html. 
  22. ↑ "Gouldian Finches or Rainbow Finches | Beauty of Birds" (in en). https://www.beautyofbirds.com/gouldianfinch.html#diet. 
  23. ↑ 23.0 23.1 23.2 "8 Top Low-Maintenance Pet Bird Species". https://www.thesprucepets.com/low-maintenance-pet-bird-species-390524. 
  24. ↑ Attenbourgh, David. The Life of Birds, Episode 9, 3 mins, 55 s.
  25. ↑ Pryke, S.R.; Griffith, S.C. (2009). "Genetic incompatibility drives sex allocation and maternal investment in a polymorphic finch". Science 323 (5921): 1605–1607. doi:10.1126/science.1168928. PMID 19299618. Bibcode: 2009Sci...323.1605P. 
  26. ↑ "Bird Controls Offspring's Gender". Scientific American. http://www.scientificamerican.com/podcast/episode/bird-controls-offsprings-gender-09-03-20. 
  27. ↑ "Gouldian Finch Personality, Food & Care – Pet Birds by Lafeber Co". https://lafeber.com/pet-birds/species/lady-gouldian-finch/. 
  28. ↑ Finch Trapping in the Kimberley, K H Coate and L H Merritt (2015) ISBN:978-0-85905-621-2 – ref Fisheries Department, table, trapped birds export statistics 1935–1939 22 August 1939, SROWA CONS 477, ITEM 1934-0059; and Department of Conservation and Land Management, table, Annual Finch Trapping Since 1968 1986. SROWA CONS 6437, ITEM 014832F3528
  29. ↑ "Department of the Environment and Energy". https://environment.gov.au/biodiversity/wildlife-trade/natives/exporting-live-australian-natives. 
  30. ↑ "Our Vision". https://www.viewsonic.com/us/about-us/. 

External links

Wikidata ☰ Q752146 entry



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