Kowari

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Kowari [1]
Dasycercus byrnei.JPG
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Dasyuromorphia
Family: Dasyuridae
Subfamily: Dasyurinae
Tribe: Dasyurini
Genus: Dasyuroides
Spencer, 1896
Species:
D. byrnei
Binomial name
Dasyuroides byrnei
Spencer, 1896
Kowari IUCN Range.png
Distribution of the kowari

The kowari (Dasyuroides byrnei), also known by its Diyari name kariri, is a small carnivorous marsupial native to the gibber deserts of central Australia. It is the sole member of the genus Dasyuroides.

Contents

Other names for the species include brush-tailed marsupial rat, bushy-tailed marsupial rat, kawiri, Kayer rat, and Byrne's crest-tailed marsupial rat.

Taxonomy

The kowari was first described by Sir Walter Baldwin Spencer in 1896, based on a type specimen collected near Charlotte Waters in the Northern Territory. The species was named in honour of Patrick Michael Byrne, the telegraph operator at the Charlotte Waters Telegraph Station who handed the specimen to Spencer. However, it is likely that the specimen was first collected by a person from the Arrernte nation.

The kowari is a member of the family Dasyuridae, and the sole member of genus Dasyuroides. For some time it was included in the genus Dasycercus with the mulgaras, however recent genetic work has confidently separated the kowari as their sister-taxon. [3]

It was once thought that there were two subspecies, however these were based on minor morphological differences and they are no longer recognised: [4]

Description

The kowari is most readily distinguished from its closest relatives, the mulgaras, by having a thick, bushy brush of black hairs fully encircling the end of its tail. [3] Other distinguishing features include having four toes on each hindfoot (as opposed to five), and the fact that the base of its tail is never fattened (tail base is often fattened in the brush-tailed mulgara, and occasionally fattened in the crest-tailed mulgara). [3]

Male kowaris are slightly larger than females, with males weighing 85-175 g, and females weighing 70-140 g. [5] Head-body length is between 14-18 cm for males and 13.5-16 cm for females, with both sexes having tails 11-16 cm long. [5]

Distribution and habitat

The kowari is found in stony desert areas of the Lake Eyre drainage basin, including the Sturt Stony Desert in north-eastern South Australia and south-western Queensland's Channel Country. [6] Its range is declining, and it is now extinct in the Northern Territory. [4]

Kowaris inhabit open gibber plains between braided river channels and sand dunes. They prefer areas where rocks are flat, even-sized and smaller than 5 cm, and there are few shrubs. [3] They burrow in small sand mounds, which form in depressions on the gibber plain, and hunt nocturnally between the sand mounds and on the gibber plain. During the day, they generally remain inside their burrows, but may emerge to bask at its entrance. [3]

Diet

The kowari is an opportunistic and voracious hunter, with its regular diet including the Long-haired Rat (Rattus villosissimus), House Mouse (Mus musculus), geckoes, insects and other arthropods, including centipedes. [7] Most animals of equal or smaller size to the kowari may be considered prey if the opportunity arises, including birds. Kowaris kill with strong bites to the head, although they do not always strike the optimal location. [3]

Reproduction

Kowaris reach sexual maturity at 10-11 months old, and will commence breeding in their first year of life. [3] Breeding occurs in May-December, with each female producing up to six pouch young. They have a gestation period of 35 days, after which the young are firmly attached to the teat for ~56 days. Other development milestones include eyes opening at 74 days, play-fighting beginning at 86 days and switching to solid food at ~95 days. [8] Once weaned, the young will live independently. Wild kowari lifespans average little more than a year, although some have been known to live and breed for two years in the wild, or longer in captivity. [3]

Conservation

The kowari is listed as a Vulnerable species under both the Australian Federal EPBC Act and IUCN Red List, as well as Vulnerable in Queensland, Endangered in South Australia, and Extinct in the Northern Territory. [9]

Much of its remaining range is currently run as pastoral land for the production of beef. In Queensland, it is protected in both the Astrebla Downs and Diamantina National Parks, although it has not been seen in Diamantina National Park since 2012. [10] In South Australia, none of its current range falls under conservation tenement, though a predator free reserve of 12,000 hectares has been set up near Andamooka Station where 12 kowaris were transferred to from around the Birdsville Track in 2022. [11]

Threats

The kowari's primary threat is habitat degradation, particularly by livestock, but also rabbits. [4] Other threats include being preyed upon by (and being in competition for prey with) feral cats, foxes, and dingoes, as well as climate change, possible poisoning by insecticides and baits, and the loss of habitat for road construction material. [4]

Overstocked cattle are known to degrade the sand mounds which kowaris burrow in for shelter, and by eating the sparse vegetation associated with the mounds, they also reduce the shelter available for kowari prey. [4] There is strong evidence that overstocking of cattle has reduced kowari abundances at some sites, and possibly led to their extirpation at others. [4]

Kowaris now have a highly fragmented population, with a high proportion of the subpopulations likely to be un-viable in the face of current threats. [4]

Diseases in captivity

Captive kowari are known to be associated with oral squamous cell carcinomas (SCCs). The SCCs cause tumours to invade the oral cavity of the kowari and begin to cause swelling in the gums. Prior to tumour formation, periodontal diseases are heavily present in the oral cavity. Captive kowaris are not expected to survive if SCCs spread into other regions of the body. [12]

Related Research Articles

<span class="mw-page-title-main">Astrebla Downs National Park</span> Protected area in Queensland, Australia

Astrebla Downs is a national park in Shire of Diamantina, Queensland, Australia.

<span class="mw-page-title-main">Hopping mouse</span> Genus of rodents

A hopping mouse is any of about ten different Australian native mice in the genus Notomys. They are rodents, not marsupials, and their ancestors are thought to have arrived from Asia about 5 million years ago.

<span class="mw-page-title-main">Numbat</span> Species of Australian marsupial

The numbat, also known as the noombat or walpurti, is an insectivorous marsupial. It is diurnal and its diet consists almost exclusively of termites.

<span class="mw-page-title-main">Dasyuridae</span> Family of marsupials

The Dasyuridae are a family of marsupials native to Australia and New Guinea, including 71 extant species divided into 17 genera. Many are small and mouse-like or shrew-like, giving some of them the name marsupial mice or marsupial shrews, but the group also includes the cat-sized quolls, as well as the Tasmanian devil and the extinct thylacine. They are found in a wide range of habitats, including grassland, underground, forests, and mountains, and some species are arboreal or semiaquatic. The Dasyuridae are often called the 'marsupial carnivores', as most members of the family are insectivores.

<span class="mw-page-title-main">Mulgara</span> Genus of marsupials

Mulgaras are the six small rat-sized species in the genus Dasycercus. They are marsupial carnivores, closely related to the Tasmanian devil and the quolls, that live in deserts and spinifex grasslands of arid Australia. They are nocturnal, but occasionally "sunbathe" in the entrance of the burrow in which they dwell. Their kidneys are highly developed to excrete extremely concentrated urine to preserve water, as the animals rarely drink. They feed mostly on insects, but also eat reptiles and small mammals. They are seasonal breeders and breed from June to September. The pouch comprises two lateral folds of skin.

<span class="mw-page-title-main">Desert rat-kangaroo</span> Extinct species of marsupial

The desert rat-kangaroo, also called the buff-nosed rat-kangaroo, plains rat-kangaroo or oolacunta, is an extinct small hopping marsupial endemic to desert regions of Central Australia. It was first recorded in the early 1840s and described by John Gould in London in 1843, on the basis of three specimens sent to him by George Grey, the governor of South Australia at the time.

<span class="mw-page-title-main">Lesser bilby</span> Extinct species of marsupial

The lesser bilby, also known as the yallara, the lesser rabbit-eared bandicoot or the white-tailed rabbit-eared bandicoot, was a rabbit-like marsupial. The species was first described by Oldfield Thomas as Peregale leucura in 1887 from a single specimen from a collection of mammals of the British Museum. Reaching the size of a young rabbit, this species lived in the deserts of Central Australia. Since the 1950s–1960s, it has been believed to be extinct.

<span class="mw-page-title-main">Kultarr</span> Species of marsupial

The kultarr is a small insectivorous nocturnal marsupial inhabiting the arid interior of Australia. Preferred habitat includes stony deserts, shrubland, woodland, grassland and open plains. The kultarr has a range of adaptations to help cope with Australia's harsh arid environment including torpor similar to hibernation that helps conserve energy. The species has declined across its former range since European settlement due to changes in land management practices and introduced predators.

<span class="mw-page-title-main">Mitchell's hopping mouse</span> Species of rodent

Mitchell's hopping mouse also known as the pankot, is the largest extant member of the genus Notomys, weighing between 40 and 60 g. N. mitchellii is a bipedal rodent with large back legs, similar to a jerboa or kangaroo rat. The species occurs throughout much of semi-arid Southern Australia, and appears to be particularly common on the Eyre Peninsula, South Australia. Typical habitat for N. mitchellii appears to be mallee shrublands on sandy dune systems. The species is currently considered to be unthreatened, but its range has been reduced through habitat disturbance and destruction associated with European settlement in Australia.

<span class="mw-page-title-main">Dasyurini</span> Tribe of marsupials

The tribe Dasyurini includes several genera of small carnivorous marsupials native to Australia: quolls, kowari, mulgara, kaluta, dibblers, neophascogales, pseudantechinuses, and the Tasmanian devil.

<span class="mw-page-title-main">Sturt Stony Desert</span> Desert in central-Eastern Australia

Sturt Stony Desert is an area in the north-east of South Australia, far south western border area of Queensland and the far west of New South Wales.

Charlotte Waters was a tiny settlement in the Northern Territory of Australia located close to the South Australian border, not far from Aputula. It was known for its telegraph station, the Charlotte Waters Telegraph Station, which became a hub for scientists travelling in central Australia in the late 19th and early 20th century. Aboriginal artist Erlikilyika, known to Europeans as Jim Kite, lived there. Only a ruin remains today.

<span class="mw-page-title-main">Plains rat</span> Species of rodent

The plains rat(Pseudomys australis), also known as the palyoora, plains mouse and eastern mouse, is a conilurine rodent native to arid and semi-arid Australia. Referred to as the pallyoora or yarlie by Indigenous groups, the plains rat was once widely distributed across central Australia, including north-west New South Wales and south-west Queensland; however, habitat degradation due to grazing, introduced predators and drought have contributed to its decline. Consequently, the plains rat has been listed as 'presumed extinct' in New South Wales and Victoria, 'endangered' in the Northern Territory and Queensland and 'vulnerable' in Western Australia and South Australia. While recent research has indicated the presence of the plains rat in areas such as the Fowlers Gap and Strzelecki Desert regions of New South Wales and within the Diamantina National Park in Queensland, there are only five sub-populations currently recognised nationally, none of which coincide with recent discoveries of the plains rat. As the current population trend of the plains rat has been listed as 'declining' by the International Union for the Conservation of Nature (IUCN), the IUCN conservation status for the species is 'vulnerable'.

<span class="mw-page-title-main">Crest-tailed mulgara</span> Species of marsupial

The crest-tailed mulgara is a small to medium-sized Australian carnivorous marsupial and a member of the family Dasyuridae which includes quolls, dunnarts, the numbat, Tasmanian devil and extinct thylacine. The crest-tailed mulgara is among a group of native predatory mammals or mesopredators endemic to arid Australia.

<span class="mw-page-title-main">Brush-tailed mulgara</span> Species of marsupial

The brush-tailed mulgara, previously the mulgara Dasycercus cristicauda, is a medium sized carnivorous Australian marsupial species weighing approximately 100 g (3.5 oz). The brush-tailed mulgara is sexually dimorphic with males being much larger than females. Their body length is 12 to 17 cm, and tail length is 6–10 cm (2.4–3.9 in). They store fat in their tail which at times can be over 16 mm (0.63 in) wide at the base.

Lucasium byrnei, also known commonly as the gibber gecko, Byrne's gecko, and the pink-blotched gecko, is a species of small, nocturnal lizard in the family Diplodactylidae. The species is endemic to Australia.

Patrick Michael Byrne (1856–1932), also known as Paddy or Pado, was an Australian telegraph operator, anthropologist and natural scientist who worked at the remote Charlotte Waters telegraph station in central Australia for 50 years. He was a keen self-taught scientist who collected specimens and corresponded extensively with biologist and anthropologist Walter Baldwin Spencer. He also worked with anthropologist Francis James Gillen at Charlotte Waters, and was a friend of and advocate for the local Arrernte people.

References

  1. Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 24. ISBN   0-801-88221-4. OCLC   62265494.
  2. McKnight, M.; Canty, P.; Brandle, R.; Robinson, A.; Watson, M. (2019). "Dasyuroides byrnei". IUCN Red List of Threatened Species . 2019: e.T6265A21944128. doi: 10.2305/IUCN.UK.2019-1.RLTS.T6265A21944128.en . Retrieved 19 November 2021.
  3. 1 2 3 4 5 6 7 8 Wilson, D.E.; Mittermeier, R. A. (2015). Handbook of the Mammals of the World. Vol. 5. Monotremes and Marsupials. Barcelona: Lynx Edicions. pp. 290–291.
  4. 1 2 3 4 5 6 7 Woinarski, J. C. Z.; Burbidge, A. A.; Harrison, P. L. (2014). The action plan for Australian mammals 2012. Collingwood, VIC: CSIRO Publishing. pp. 69–72.
  5. 1 2 Aslin, H.J.; Lim, L. (1995). "Kowari". In Strahan, Ronald (ed.). The Mammals of Australia. Reed Books. pp. 59–61.
  6. Menkhorst, Peter (2001). A Field Guide to the Mammals of Australia. Oxford University Press. p. 52.
  7. Baker, A (2018). Secret Lives of Carnivorous Marsupials. Clayton South, VIC: CSIRO Publishing.
  8. Aslin, H. J. (1974). "The behaviour of Dasyuroides byrnei (Marsupialia) in captivity". Zeitschrift für Tierpsychologie. 35 (2): 187–208. doi:10.1111/j.1439-0310.1974.tb00443.x. PMID   4450819.
  9. "Dasyuroides byrnei - Kowari, brushy-tailed marsupial rat, Byrne's crest-tailed marsupial rat". Department of Agriculture, Water and the Environment, Australian Government. Retrieved 16 July 2021. CC-BY icon.svg Text may have been copied from this source, which is available under a Attribution 3.0 Australia (CC BY 3.0 AU) licence
  10. Grounds, Ellie (18 June 2021). "Rare footage of endangered marsupial kowari captured in outback Queensland". ABC News. Australian Broadcasting Corporation. Retrieved 16 July 2021.
  11. Cominos, Christian (16 August 2022). "Endangered marsupial gets fresh chance after 12 kowaris released in outback SA reserve". ABC News . Retrieved 25 November 2022.
  12. Saunders, Richard; Killick, Rowena; Barrows, Michelle; Stidworthy, Mark (2017). "Oral Squamous Cell Carcinoma in Three Related Kowari ( Dasyuroides byrnei )". Journal of Comparative Pathology. 156 (2–3): 286–290. doi:10.1016/j.jcpa.2017.01.001. PMID   28196645.