Overview

Brief Summary

Biology

This nocturnal and generally solitary marsupial feeds on various grasses. It spends the day inside burrows, and creates huge complex burrow systems (6) in deep sandy soil (5). Burrows occur in groups used by four to five wombats, urine and dung are used to mark burrows that are in use, and obvious paths connect adjacent burrows (5). About half of the adult females swap their burrow group during their life (5). Mating occurs in spring and summer, and most births occur from November to March (6). Females produce a single young each year and can potentially produce two young in three years when rainfall is good, but this rarely happens. The young are carried in a posterior-facing pouch for about eight to nine months (6). Although active at night, they occasionally bask in the sun in winter near the entrance of the burrow (5) (6). A number of adaptations help this species to minimise the time spent in the open; it has one of the lowest water requirements of any mammal, and very low energy expenditure (5). Despite their somewhat lumbering appearance, northern hairy-nosed wombats are capable of running at 40 kilometres per hour when threatened (8).
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Comprehensive Description

Description

The northern hairy-nosed wombat is one of the world's rarest mammals (4), and is the largest known herbivorous burrowing mammal (5). Like the two other wombat species it has a stocky build, a short tail and strong short legs (2). The large head has pointed ears and small eyes, and whiskers that emerge from the side of the nose, hence the common name (6). The forepaws are large with strong claws, and are used for burrowing (2). It has soft silver-grey to brown fur with dark rings surrounding the eyes (2) (6). Males and females are generally similar in appearance, but males are slightly shorter in length, have thicker necks and stockier shoulders (2).
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Distribution

Range Description

This species is endemic to Australia, where it formerly ranged from Deniliquin in south-central New South Wales north to Mount Douglas in central Queensland. It is currently restricted to Epping Forest National Park, 120 km north-west of Clermont in central Queensland (Horsup and Johnson 2008). The species' range at Epping Forest National Park covers 500 ha, or less than one sixth of the park (Horsup 2004; Horsup and Johnson 2008). Fossils of this species have been found as far south as Victoria.
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Geographic Range

Lasiorhinus krefftii used to be abundant in New South Wales until the settlement of Europeans in the area after 1872. There were populations near St. George in South Queensland and near Jeriderie in New South Wales until around 1910. The sole population of the hairy-nosed wombat is now in the Epping Forest National Park, northwest of Clermont in Central Queensland.

Biogeographic Regions: australian (Native )

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Historic Range:
Australia

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Range

At present, just one population of about 90 individuals (7) is known in 300 hectares of Epping Forest National Park, central Queensland, Australia (4) (5). Historically it has only been known from two other sites, one in Deniliquin, New South Wales, the other in southern Queensland, both of which were extinct by 1908 (5).
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Physical Description

Morphology

Physical Description

These wombats are heavily built with very powerful forearms. They have a thick, stocky body that averages one meter (3.25 ft) in length. Their heads are large, with small eyes and pointed ears. Currently they are one of the world's largest burrowing animals. Males and females are both covered with a soft, silky brown coat. They have long whiskers extending from the sides of their noses -- hence the name hairy-nosed wombat. The females have posteriorly-oriented pouches. They also have continuously growing upper molars due to their diet.

Range mass: 25 to 40 kg.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
It is found in areas of deep alluvial soils and open eucalypt woodlands along inland river systems. The species requires a supply of perennial native grasses near to its burrows (Horsup 1999).

Systems
  • Terrestrial
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Habitat

Hairy-nosed wombats are terrestrial and build burrows. They spend time both above and below ground. They live in semi-arid, open woodlands or grasslands.

Terrestrial Biomes: savanna or grassland

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Habitat

Inhabits semi-arid sandy grasslands or gum tree (eucalypt)/ acacia woodlands (8).
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Trophic Strategy

Food Habits

The hairy-nosed wombat is strictly herbivorous and feeds on the native grasses in the park where it resides. These grasses include Hetropogon contortus (bunch spear grass) and Aristida spp. (three-awned grass). The wombat's decline in numbers has mostly been due to competition from local cattle for the grass they both feed upon. These animals have weak eyesight combined with a good senses of smell and hearing, and their activity is nocturnal.

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Life History and Behavior

Life Expectancy

Lifespan/Longevity

Average lifespan

Status: captivity:
30 years.

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Lifespan, longevity, and ageing

Maximum longevity: 30 years (captivity)
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Reproduction

Reproduction

There is a single mating season per year that takes place in the spring/summer period. Time of birth ranges from November to March. Hairy-nosed wombats give birth to a single young. It has recently been hypothesized that heavy rainfall in the winter months prior to the mating season is positively correlated with birth rate. This is most likely because rain makes the native grasses more abundant. Observations on their natural habitat have revealed low subadult survivorship, but without revealing why this occurs. The young wombat is carried in the mother's pouch for approximately six months, and it is nursed for eight to nine months. Unfortunately, almost nothing is known about the details of their reproduction or gestation because it is very difficult to observe them in the wild, and in captivity they do not fare well. Trapped animals are kept only for a short period of time.

Average number of offspring: 1.

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
CR
Critically Endangered

Red List Criteria
B1ab(iii)

Version
3.1

Year Assessed
2008

Assessor/s
Taggart, D., Martin, R. & Horsup, A.

Reviewer/s
Lamoreux, J. & Hilton-Taylor, C. (Global Mammal Assessment Team)

Contributor/s

Justification
Listed as Critically Endangered because the extent of occurrence is less than 100 km2, all individuals are known from a single location, and the quality of its habitat is declining due largely to invasive exotic grasses.

History
  • 1996
    Critically Endangered
  • 1994
    Endangered
    (Groombridge 1994)
  • 1990
    Endangered
    (IUCN 1990)
  • 1988
    Endangered
    (IUCN Conservation Monitoring Centre 1988)
  • 1986
    Endangered
    (IUCN Conservation Monitoring Centre 1986)
  • 1982
    Endangered
    (Thornback and Jenkins 1982)
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Conservation Status

Lasiorhinus krefftii are extremely endangered and there have been massive efforts to prevent their extinction. Although previously avoided at almost all costs, trapping has now become a major tool for conservationists to build up this population of wombats. The trapping experiments were begun in 1985. In 1981 it was estimated that there were only 20-40 wombats left, but now the estimated number of wombats is around 70. The local cattle in the area have been the largest problem for the population in recent years. There are now strict restrictions on cattle grazing in the park. The wombats used to be abundant before European settlement as well.

IUCN Red List of Threatened Species: critically endangered

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Current Listing Status Summary

Status: Endangered
Date Listed: 12/02/1970
Lead Region: Foreign (Region 10) 
Where Listed:


Population detail:

Population location: entire
Listing status: E

For most current information and documents related to the conservation status and management of Lasiorhinus krefftii (formerly, see its USFWS Species Profile

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Status

Classified as Critically Endangered (CR) by the IUCN Red List 2007 (1) and listed on Appendix I of CITES (3).
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Population

Population
The current population of Northern Hairy-nosed Wombats is 115 animals (Horsup and Johnson 2008). The population had fallen as low as 30-40 individuals in the early 1980s, but the exclusion of cattle from its range in 1982 led to a steady increase in numbers. Periods of drought can greatly reduce the population (as in the mid 1990s) (Horsup and Johnson 2008). In 2000 Dingoes eliminated 15-20 individuals and a 20-km-long fence now encompasses the entire population (Horsup and Johnson 2008).

Population Trend
Stable
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Threats

Threats

Major Threats
The species declined through extensive broad-scale habitat destruction and competition with cattle and sheep, particularly during droughts (Horsup 2004). It is currently threatened by its small colony size, making it vulnerable to local catastrophes (disease or wildfire), demographic and environmental stochasticity, inbreeding and subsequent loss of genetic variation, and by native competitors and introduced predators (Horsup 2004). Introduced buffel grass is taking over its natural habitat within Epping Forest National Park.
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Threats

This wombat may have already been uncommon when Europeans settled, but the decline accelerated due to a combination of drought and competition with introduced grazing livestock (9). Habitat alteration and incidental poisoning may also have contributed to the decline (2). The species may now be vulnerable to predation by dingoes and competition with native species for food (5).
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Management

Conservation Actions

Conservation Actions
This species is listed as a threatened species by Queensland and by Australian law. Its entire range is within the Epping Forest National Park. The Recovery Plan for this species is in its third edition (see Horsup 2004). The following management actions are underway or planned:

1) Control threats and manage habitat. Predator control ? A 20-km predator fence was built in 2002 to prevent a repeat of dingo predation that killed at least 15 wombats in 2000. Monitor and control competitors ? The Eastern Grey Kangaroo is the major competitor for food and its numbers are being monitored. Habitat management ? Introduced buffel grass is regularly slashed to promote green growth and native species. Fire management ? Annual burns are undertaken to reduce fuel loads and promote plant diversity. Supplementary feed and water provisioning ? Feed and water stations are now being used by wombats, particularly in dry times (Treby et al. 2007). Permanent management presence on Epping Forest National Park ? A volunteer caretaker program ensures twice daily monitoring of the dingo fence.

2) Accurately monitoring wombats. Population censuses ? Three censuses each year minimize disturbance and maximize the accuracy of the result and involve collecting wombat hair on sticky tape to extract DNA (see Banks et al. 2003). Burrow monitoring ? This is undertaken every six months and monitors activity levels at burrows as an ?early warning system?. Trapping ? This was the major means of censusing prior to development of the DNA technique and is now only undertaken when necessary (e.g., to attach radio-collars).

3) Translocation. Locate sites for the establishment of future Northern Hairy-nosed Wombat colonies and develop translocation techniques on Epping Forest National Park.

4) Develop captive techniques on other wombat species. Southern Hairy-nosed Wombats are being used to improve wombat captive breeding and reproductive monitoring techniques. There are no Northern Hairy-nosed Wombats in captivity.

5) Monitor wombat biology and ecology. This includes ongoing studies of diet, reproduction, habitat utilization, behavior, and burrow architecture.

6) Manage the recovery team. A full-time Recovery Manager is responsible for coordinating and implementing the Recovery Plan, making all relevant information available to recovery personnel, obtaining funding for the Recovery Plan, and undertaking research and monitoring.

This species is listed on CITES Appendix I.
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Conservation

Huge efforts have been made to conserve this species (6). In 1971, the Epping Forest National Park was established to protect the last population of northern hairy-nosed wombats, and by 1982 cattle had been excluded from the area (10). A recovery plan has been produced; the aims of this plan include the establishment of a captive rearing facility (2) and the creation of a second wild population. Suitable sites for re-introduction are currently being identified. The long-term aim of the plan is to establish a network of populations throughout the historic range (5). In 1981 estimates put the population at just 20 to 40 individuals, this had risen to 110 in 2000 (11), but there may be as few as 20 breeding females, (11) so it is clear that the status of this species is very precarious, and that determined long-term conservation efforts are essential if it is to step back from the brink of extinction.
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Relevance to Humans and Ecosystems

Benefits

Economic Importance for Humans: Negative

The rigorous conservation attempts for this wombat have been costly to the Australian government and other independent sources. They have also been a problem for cattle raisers because they have been forced to find new areas for their cattle to graze. This is especially difficult because this area of Australia is plagued by droughts (a problem for the wombats themselves.)

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Economic Importance for Humans: Positive

Until recently, the northern hairy-nosed wombat was widely hunted for its fur, which has high commercial value.

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Wikipedia

Northern hairy-nosed wombat

The northern hairy-nosed wombat (Lasiorhinus krefftii), also known as the yaminon, is one of three species of wombats. It is one of the rarest large mammals in the world and is critically endangered. Its historical range extended across New South Wales, Victoria and Queensland as recently as 100 years ago, but it is now restricted to one place, a 3 km² range within the 32 km² Epping Forest National Park in Queensland. In 2003 the total population consisted of 113 individuals, including only around 30 breeding females.[3]

Contents

Description

Yaminons can be 35 cm high, up to 1 m long and up to 40 kg. The females are a little bit bigger than the males because they have an extra layer of fat. It is slightly larger than the common wombat and able to breed somewhat faster (two young every three years). The northern hairy-nosed wombat's nose is very important in their survival because they have very poor eyesight so they can smell their food in the dark. It takes about a day for a northern hairy-nosed wombat to dig a burrow with their sharp claws (The wombat's claws are about 5 cm in length).

Behaviour

The northern hairy-nosed wombat is nocturnal, and has been known to share burrows.[4] Its diet is made up of coarse grass and various types of roots. Its habitat has become infested with African buffel grass, which out-competes the native grasses the Yaminon prefers to feed on. One young can be born, often during the wet season. It stays in the pouch for 6-9 months, leaving its mother after a year.[4]

Phylogeny

Placental and marsupial mammals are an example of divergent evolution, an evolutionary concept occurring when a single group of organisms splits into two groups and each group evolves in increasingly different directions. The wombat, with all marsupials, diverged from placental mammals during the Cretaceous. The hairy-nosed wombat shares marsupial ancestors with kangaroos and the koala.

Analogous Structures

Though the northern hairy-nosed wombat shares many similar structural features to that of the Marmot, these mammals are not closely related. The Marmot is a placental mammal living in such environments as mountains. Both species have long, strong claws, well designed to dig burrows. This being analogous, both species has evolved this similarity over a period of time.

Homologous Structures

A homologous structure and characteristic which is present in all wombats, including hairy-nosed wombats, have a pouch which opens at the female wombat's rear end. This characteristic is not common among other marsupials. Having its pouch opening at its rear end is an advantage due to the wombats constant burrowing, as the risk of dirt entering the pouch and harming the offspring is very high. The pouch opening being at the wombats rear end also provides better protection when the mother walks and runs, and also against predators.

Preservation

The northern hairy-nosed wombat is listed as "endangered" by the Australian Species Profile and Threats Database (SPRAT),[5] and "critically endangered" by the IUCN.[2] Its range is restricted to about 300 ha (750 acres) of the Epping Forest in east-central Queensland, 120 km northwest of Clermont. A two metre-high predator-proof fence was constructed around 25 km² of the park in 2000. Recently, a second colony of wombats has been established at Richard Underwood Nature Refuge at Yarran Downs near St George in southern Queensland. [6] This second colony was established in 2008 and is also in a reserve surrounded by a predator proof fence. [6]

References

  1. ^ Groves, Colin P. (16 November 2005). "Order Diprotodontia (pp. 43-70)". In Wilson, Don E., and Reeder, DeeAnn M., eds. Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press, 2 vols. (2142 pp.). p. 43. ISBN 978-0-8018-8221-0. OCLC 62265494. http://www.bucknell.edu/msw3/browse.asp?id=11000008. 
  2. ^ a b Taggart, D., Martin, R. & Horsup (2008). Lasiorhinus krefftii. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 02 Sept 2009.
  3. ^ Eastwood, K. (October–December 2003). "Saving the northern hairy-nosed wombat". Australian Geographic (72). 
  4. ^ a b "Northern Hairy Nosed Wombat". Unique Austrlian Animals. http://australian-animals.net/wombat-n.htm. 
  5. ^ "Lasiorhinus krefftii Northern Hairy-nosed Wombat". Species Profile and Threats Database. http://www.deh.gov.au/cgi-bin/sprat/public/publicspecies.pl?taxon_id=198. Retrieved 2007-01-05. 
  6. ^ a b Department of Environment and Resource Management. "Northern hairy-nosed wombat". Queensland Government. http://www.derm.qld.gov.au/wildlife-ecosystems/wildlife/threatened_plants_and_animals/endangered/northern_hairynosed_wombat/. 
  • Underhill D (1993). Australia's Dangerous Creatures. Sydney NSW: Reader's Digest. ISBN 0-86438-018-6. 
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