Tasmanian nativehen

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Tasmanian nativehen
Gallinula mortierii 1.jpg
male
Tasmanian Native-hen.jpg
female
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Gruiformes
Family: Rallidae
Genus: Tribonyx
Species:
T. mortierii
Binomial name
Tribonyx mortierii
Tasmanian Native-hen-Dist.gif
Distribution
Synonyms

Gallinula mortierii

The Tasmanian nativehen (Tribonyx mortierii) (palawa kani: piyura) [2] (alternative spellings: Tasmanian native-hen or Tasmanian native hen) is a flightless rail and one of twelve species of birds endemic to the Australian island of Tasmania. Although many flightless birds have a history of extinction at the hands of humans, [3] the species has actually benefited from the introduction of European-style agricultural practices in Tasmania. [4] Its success may also be attributed to the recent extinction of its main predator, the thylacine. [5]

Contents

Nomenclature

The species was originally described in 1840 as Tribonyx mortierii — the mortierii being in honour of Barthélemy Charles Joseph Dumortier. [6] Local names include narkie, waterhen and turbo chook. [7] The Paredarerme name for the nativehen is 'mientarunya' and is derived from the Paredarerme and Little Swanport languages. [2]

Description

The Tasmanian nativehen is a stocky flightless bird between 43 and 51 centimetres (17 and 20  in ) in length. The upperparts are olive-brown with a white patch on the flank. The underparts are darker with a bluish-grey tinge. The short tail is close to black and mostly held erect. The legs are thick and powerful, with a grey scaly appearance and sharp claws. The eyes are bright red. The bill has a small greenish-yellow frontal shield. [8]

The juvenile bird is similar in appearance to the adult, though the colours are more subdued on the body and the underparts have fine white spots. The bill is greenish-yellow and the eyes bright red. [9] Male birds generally have longer bills and legs, though there is enough overlap that the sexes are indistinguishable, even in the hand. [4]

Voice

The species has 14 separate calls, ranging from low grunts to high pitched alarm calls as well as a see-sawing duet performed in unison, rising to a crescendo of harsh screeching notes, [6] It also calls at night. [10]

Distribution and habitat

The species is endemic to, and widespread in, Tasmania apart from the west and south-west regions. It is sedentary, living around open grassy areas close to water. It is not found on King or Flinders Island in the Bass Strait, [11] though Michael Sharland does record it as being on Flinders Island. [12] A population introduced to Maria Island is now well established. It is generally common and easily seen around bodies of water that have grassy verges. [8]

Fossil records indicate that it was found on the Australian mainland until around 4700 years ago. Suggested reasons for its extirpation have included human overhunting, the introduction of the dingo, [6] or an extremely dry period. [13]

Behaviour and social organisation

Flock on the run, Bruny Island Tasmanian Native-hens, Bruny Island.jpg
Flock on the run, Bruny Island

The nativehen's social organisation has been extensively studied. They live in groups of between two and five, plus the young birds from the previous breeding season, which tend to stay with the group and contribute to the care of the young until they move off to establish their own territories after approximately one year. The sedentary nature of the species means that groups hold sharply defined territories of up to 5 acres (2.0 ha), and repel transgression into their territory vigorously with calls and displays. Fights can also occur, where birds will jump, peck and kick at each other violently, sometimes drawing blood and pulling feathers. [4]

Although flightless, the bird is capable of running quickly and has been recorded running at speeds up to 69 kilometres per hour (43 mph). [12] It uses its wings when running fast to help it to balance. [14]

Breeding

Nest with eggs Tasmanian Native Hen Nest and Eggs.jpg
Nest with eggs
Chick Tasmanian-Native-hen-Chick.jpg
Chick

The breeding structure may be monogamous or polygamous, usually polyandrous. Each group contains a single breeding female who will mate with all the males of the group. [6] The unusual social structure based on groups who stay together is not known to occur in many other species; the high ratio of male chicks to female chicks hatched is thought to be a possible explanation for this. [4]

The breeding season begins in the period from July to September, depending upon rainfall and the availability of food. Birds will usually breed once per year, however in good years, with high availability of food, two broods may be produced. [4] [12] The nest is a rough, flattened grass mattress, among taller grasses and is usually built close to water, or on damp ground. With a clutch size of five to eight, the oval eggs measure around 56 by 38 millimetres (2.2 in × 1.5 in) and are a dull yellow or buff to brown with some spotting of reddish brown and lavender. [15] As well as the primary nest, nursery nests are constructed with the purpose of roosting with chicks at night and as hiding places in case of predators. [4] Chicks are covered in a dark brown fluffy down.


Feeding

The diet is mostly made up of grass shoots and the leaves of low herbs which it grazes during daylight hours. [4] Birds will also eat insects, seeds and orchard fruit. [6] The species has a reputation among farmers as an agricultural pest. The damage to agriculture was extensively studied in the 1960s by M Ridpath and G Meldrum, who found that although there is some damage to crops, rabbits were responsible for more damage. Many beliefs held by farmers about damage to crops were found to be unlikely, with damage probably caused by other species. [16]

The species is a secondary grazer, meaning that it depends on other species to keep grass swards low and with fresh shoots. Before European settlement in Tasmania, the cleared spaces required for feeding would probably have been provided by Indigenous burning of grasslands to provide feeding grounds for mammals, which would be hunted for food. The expansion of these cleared grassy areas, and the introduction of rabbits, has provided greater food sources and consequently greater numbers of the species within its range. [4]

Conservation and threats

The species is currently classified as a species of least concern by the IUCN. Although there is a healthy population size and no significant falls have been measured, there is concern about the possible arrival [17] of the red fox in Tasmania and the potential impact that it would have on this and other species.

Since 15 August 2007 it has been protected under Tasmanian legislation. Prior to this it was one of only four native birds that had no legal protection in the state of Tasmania outside national parks and other reserves — the last of Tasmania's 12 endemic bird species with this dubious status. The three remaining unprotected native species are the forest raven, the great cormorant, and the little pied cormorant. All other native Tasmanian birds are listed as protected under the state's Nature Conservation Act 2002. [18]

Related Research Articles

<span class="mw-page-title-main">Forest raven</span> Australian native bird

The forest raven, also commonly known as the Tasmanian raven, is a passerine bird in the family Corvidae native to Tasmania and parts of southern Victoria, such as Wilsons Promontory and Portland. Populations are also found in parts of New South Wales, including Dorrigo and Armidale. Measuring 50–53 cm (20–21 in) in length, it has all-black plumage, beak and legs. As with the other two species of raven in Australia, its black feathers have grey bases. Adults have white irises; younger birds have dark brown and then hazel irises with an inner blue rim. New South Wales populations are recognised as a separate subspecies C. tasmanicus boreus, but appear to be nested within the Tasmanian subspecies genetically.

<span class="mw-page-title-main">Grey currawong</span> Large passerine bird native to southern Australia and Tasmania

The grey currawong is a large passerine bird native to southern Australia, including Tasmania. One of three currawong species in the genus Strepera, it is closely related to the butcherbirds and Australian magpie of the family Artamidae. It is a large crow-like bird, around 48 cm (19 in) long on average; with yellow irises, a heavy bill, dark plumage with white undertail and wing patches. The male and female are similar in appearance. Six subspecies are recognised and are distinguished by overall plumage colour, which ranges from slate-grey for the nominate from New South Wales and eastern Victoria and subspecies plumbea from Western Australia, to sooty black for the clinking currawong of Tasmania and subspecies halmaturina from Kangaroo Island. All grey currawongs have a loud distinctive ringing or clinking call.

<span class="mw-page-title-main">Black currawong</span> Large passerine bird endemic to Tasmania and Bass Strait islands

The black currawong, also known locally as the black jay, is a large passerine bird endemic to Tasmania and the nearby islands within the Bass Strait. One of three currawong species in the genus Strepera, it is closely related to the butcherbirds and Australian magpie within the family Artamidae. It is a large crow-like bird, around 50 cm (20 in) long on average, with yellow irises, a heavy bill, and black plumage with white wing patches. The male and female are similar in appearance. Three subspecies are recognised, one of which, Strepera fuliginosa colei of King Island, is vulnerable to extinction.

<span class="mw-page-title-main">Yellow-tailed black cockatoo</span> Species of bird native to the south-east of Australia

The yellow-tailed black cockatoo is a large cockatoo native to the south-east of Australia measuring 55–65 cm (22–26 in) in length. It has a short crest on the top of its head. Its plumage is mostly brownish black and it has prominent yellow cheek patches and a yellow tail band. The body feathers are edged with yellow giving a scalloped appearance. The adult male has a black beak and pinkish-red eye-rings, and the female has a bone-coloured beak and grey eye-rings. In flight, yellow-tailed black cockatoos flap deeply and slowly, with a peculiar heavy fluid motion. Their loud, wailing calls carry for long distances. The yellow-tailed black cockatoo is found in temperate forests and forested areas across south and central eastern Queensland to southeastern South Australia, including a very small population persisting in the Eyre Peninsula. Two subspecies are recognised, although Tasmanian and southern mainland populations of the southern subspecies xanthanotus may be distinct enough from each other to bring the total to three. Birds of subspecies funereus have longer wings and tails and darker plumage overall, while those of xanthanotus have more prominent scalloping. The subspecies whiteae is found south of Victoria to the East of South Australia and is smaller in size.

<span class="mw-page-title-main">Moorhen</span> Genus of birds

Moorhens—sometimes called marsh hens—are medium-sized water birds that are members of the rail family (Rallidae). Most species are placed in the genus Gallinula, Latin for "little hen." They are close relatives of coots. They are often referred to as (black) gallinules. Recently, one of the species of Gallinula was found to have enough differences to form a new genus Paragallinula with the only species being the lesser moorhen.

<span class="mw-page-title-main">Dusky moorhen</span> Species of bird

The dusky moorhen is a bird species in the rail family and is one of the eight extant species in the moorhen genus. It occurs in India, Australia, New Guinea, Borneo and Indonesia. It is often confused with the purple swamphen and the Eurasian coot due to similar appearance and overlapping distributions. They often live alongside birds in the same genus, such as the Tasmanian nativehen and the common moorhen.

<span class="mw-page-title-main">Eastern rosella</span> Species of bird

The eastern rosella is a rosella native to southeastern Australia, including Tasmania.

<span class="mw-page-title-main">Orange-bellied parrot</span> Species of bird

The orange-bellied parrot is a small parrot endemic to southern Australia, and one of only three species of parrot that migrate. It was described by John Latham in 1790. A small parrot around 20 cm (8 in) long, it exhibits sexual dimorphism. The adult male is distinguished by its bright grass-green upper parts, yellow underparts and orange belly patch. The adult female and juvenile are duller green in colour. All birds have a prominent two-toned blue frontal band and blue outer wing feathers.

<span class="mw-page-title-main">Muttonbirding</span> Seasonal harvesting of petrel chicks

Muttonbirding is the seasonal harvesting of the chicks of petrels, especially shearwater species, for food, oil and feathers by recreational or commercial hunters. Such hunting of petrels and other seabirds has occurred in various locations since prehistoric times, and there is evidence that many island populations have become extinct as a result. More recently ‘muttonbirding’ usually refers to the regulated and sustainable harvesting of shearwaters in Australia and New Zealand. These include the short-tailed shearwater, also known as the yolla or Australian muttonbird, in Bass Strait, Tasmania, as well as the sooty shearwater, also known as the tītī or New Zealand muttonbird, on several small islands known as the Muttonbird Islands, scattered around Stewart Island in the far south of New Zealand.

<span class="mw-page-title-main">Tasmanian Arboretum</span>

The Tasmanian Arboretum is a botanical tree park near Devonport, Tasmania, Australia.

<span class="mw-page-title-main">Stubble quail</span> Species of bird

The stubble quail is a native Australian species which is the most common quail species in Australia. The species is not under any threat of extinction. Stubble quail are widespread and found throughout all states and territories of Australia excluding Tasmania. Other common names include grey quail and pectoral quail.

<span class="mw-page-title-main">Tasmanian wedge-tailed eagle</span> Subspecies of bird

The Tasmanian wedge-tailed eagle is an endangered bird of Tasmania. It is a subspecies of the more common wedge-tailed eagle.

<span class="mw-page-title-main">Green rosella</span> Species of parrot native to Tasmania and the Bass Strait Islands

The green rosella or Tasmanian rosella is a species of parrot native to Tasmania and Bass Strait islands. It was described by the German naturalist Johann Friedrich Gmelin in 1788, and named on the mistaken assumption it came from New Caledonia. At 14.5 in (37 cm) long it is the largest species of the rosella genus, Platycercus. Two subspecies are recognised. The green rosella's underparts, neck and head are yellow, with a red band above the beak and violet-blue cheeks. The back is mostly black and green, and its long tail blue and green. The sexes have similar plumage, except the female has duller yellow plumage and more prominent red markings, as well as a smaller beak. Juvenile and immature birds have predominantly green plumage.

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<span class="mw-page-title-main">Kagu</span> Species of bird

The kagu or cagou is a crested, long-legged, and bluish-grey bird endemic to the dense mountain forests of New Caledonia. It is the only surviving member of the genus Rhynochetos and the family Rhynochetidae, although a second species has been described from the fossil record.

<span class="mw-page-title-main">Ecology of Tasmania</span>

The biodiversity of Tasmania is of exceptional biological and paleoecological interest. A state of Australia, it is a large South Pacific archipelago of one large main island and a range of smaller islands. The terrain includes a variety of reefs, atolls, many small islands, and a variety of topographical and edaphic regions on the largest island, all of which promote the development of unusually concentrated biodiversity. During long periods geographically and genetically isolated, it is known for its unique flora and fauna. The region's climate is oceanic.

<span class="mw-page-title-main">Tasmanian Central Highland forests</span> Terrestrial ecoregion in Tasmania, Australia

The Tasmanian Central Highland forests is a temperate broadleaf and mixed forests ecoregion in Australia. It covers Tasmania's Central Highlands region.

References

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  2. 1 2 "Tasmanian Aboriginal Centre – Tasmanian Aboriginal place names". tacinc.com.au. Retrieved 28 June 2022.
  3. Boyer, Alison G. (2008). "Extinction patterns in the avifauna of the Hawaiian islands". Journal of Conservation Biology. 14 (3): 509–517. doi: 10.1111/j.1472-4642.2007.00459.x .
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  5. Tall turkeys and nuggety chickens: large 'megapode' birds once lived across Australia 14 June, 2017 10.49am AEST
  6. 1 2 3 4 5 Marchant, S.; P. J. Higgins (1993). Handbook of Australian and, New Zealand and Antarctic Birds. Volume 2: Raptors to Lapwings. Melbourne: Oxford University Press.
  7. Tasmanian Native Hen. University of Tasmania. Accessed 22-5-2009 Archived 2 October 2006 at the Wayback Machine
  8. 1 2 Watts, Dave (1999). Field guide to Tasmanian Birds. Frenchs Forest, New South Wales: New Holland Press. p. 70. ISBN   1-876334-60-6.
  9. Ripley, Sidney Dillon; P.J. Higgins (1977). Rails of the World. David R. Godine.
  10. Aberg, Patrik. "XC98484 Tasmanian Nativehen (Tribonyx mortierii)". Xeno Canto. Retrieved 16 June 2019.
  11. Thomas, D. 1979. Tasmanian Bird Atlas. Hobart: University of Tasmania.
  12. 1 2 3 Sharland, M. 1958. Tasmanian Birds: a field guide to the birds inhabiting Tasmania and adjacent islands, including the sea birds. Sydney: Angus and Robertson.
  13. Ford, Hugh A. (1989). Ecology of Birds: An Australian perspective. Chipping Norton, New South Wales: Surrey Beattie and Sons. ISBN   0-949324-19-1.
  14. "Tasmanian Native Hen, Tribonyx mortierii". www.parks.tas.gov.au. Parks & Wildlife Service. Retrieved 18 January 2016.
  15. Beruldsen, Gordon (2003). Australian Birds: Their Nests and Eggs. Kenmore Hills, Qld: self. p. 210. ISBN   0-646-42798-9.
  16. Ridpath, M.G. and Meldrum G.K. 1968. Damage done to pastures by the Tasmanian Native hen, Tribonyx mortierii, in CSIRO Wildlife Research, 1968, 13, 11–24.
  17. Tasmanian Parks and Wildlife Service - Foxes in Tasmania Accessed 03-11-2011
  18. Wildlife Regulations 1999 – Protected wildlife Tasmanian Consolidated Regulations Accessed 01-11-2010