Overview

Distribution

Range Description

The Southern Brown Bandicoot is endemic to Australia. It is absent from the interior of the country but occurs from south-western Western Australia to south-eastern Victoria and into New South Wales. It also occurs on the island of Tasmania and in a widely disjunct populations in northern Queensland.
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Geographic Range

Isoodon obesulus inhabits several different geographic ranges. There are populations in eastern New South Wales, southern Victoria, southeastern south Australia, Kangaroo Island, southwestern western Australia, The Recherche Archipelago, Tasmania, and West Sister Island in Bass Strait. (Nowak, 1991)

Biogeographic Regions: australian (Native )

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Physical Description

Morphology

Physical Description

Short nosed bandicoots are plain looking animals, similar in size and shape to rats and rabbits. The species obesulus has a shorter snout than other species of bandicoot, but it is still elongated for foraging. They have short rounded ears and sharp claws. The short nosed bandicoot has several colors in its fur. The upper part of the fur is usually blackish brown with hints of orange or yellow, while the underside is lighter brown, grey, or white. The short nosed bandicoot has a pouch that runs along the stomach and opens backwards between the hind legs. (Nowak, 1991)

Range mass: 1.1 to 1.4 kg.

Average basal metabolic rate: 1.238 W.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
The Southern Brown Bandicoot inhabits a range of forest, woodland, shrub, and heath communities (Paul 2008). It is omnivorous and active in both the day and night. Females give birth to up to six young, but usually only two survive until they are weaned (Paul 2008).

Systems
  • Terrestrial
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Habitat

Isoodon obesulus prefer dense ground cover, tall grass and low shrubbery. They live near swamps and rivers as well as in thick scrub in drier areas. They make their nests on the ground and in logs. The nests consist of sticks, leaves, grass, and soil. (Macdonald, 1984; Nowak, 1991)

Terrestrial Biomes: savanna or grassland

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Trophic Strategy

Food Habits

Isoodon obesulus are omnivores. They feed on soil invertebrates and insects as well as fruits, seeds, fungi, and some plant fibers. They favor insects and worms. Isoodon obesulus use their sharp claws and pointed noses to dig for food. They use their front legs to repeatedly step on prey that is captured in order to crush it. (Macdonald, 1984; Nowak, 1991)

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Life History and Behavior

Life Expectancy

Lifespan/Longevity

Average lifespan

Status: captivity:
6.5 years.

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Lifespan, longevity, and ageing

Maximum longevity: 6.5 years (captivity) Observations: One captive specimen was at least 6.5 years old when it died (Richard Weigl 2005).
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Reproduction

Reproduction

Short nosed Bandicoots have pouches that are characteristic of most marsupials. Females carry their babies in these pouches for about 50 days after they are born. Bandicoots can reach sexual maturity as early as 90 days of age. Bandicoots are polyestrous, which means that they are able to reproduce several times a year. The gestation period in this species is only 12.5 days. This gives Bandicoots the highest reproductive rate of all marsupials. Typically there are 4 babies in the pouch at one time, but up to 5 have been found. (Macdonald, 1984; Nowak; 1991)

Average birth mass: 0.35 g.

Average number of offspring: 2.73.

Average age at sexual or reproductive maturity (female)

Sex: female:
210 days.

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2008

Assessor/s
Friend, T., Morris, K., van Weenen, J., Winter, J. & Menkhorst, P.

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

Justification
Listed as Least Concern because, although the species is declining in many areas, it has a wide distribution, presumed large population, occurs in a number of protected areas, and it is unlikely to be declining at the rate required to qualify for listing in a threatened category.

History
  • 1996
    Lower Risk/least concern
    (Baillie and Groombridge 1996)
  • 1996
    Lower Risk/least concern
    (Baillie and Groombridge 1996)
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Conservation Status

Many species of bandicoot have already gone extinct due to habitat loss caused by grazing livestock. Many other species including Isoodon obesulus, are in great danger. In Australia the decline of bandicoots is worse than the decline of any other marsupial. (Macdonald, 1984)

IUCN Red List of Threatened Species: least concern

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Population

Population
This species is rare and scattered overall (Paul 2008). It is thought to be numerous in Western Australia, but greatly reduced in terms of numbers and extent of occurrence since European settlement. It occurs in highly fragmented locations in South Australia, Victoria, and New South Wales. It is common within its small range in Queensland. There is no information about populations in Tasmania.

Population Trend
Decreasing
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Threats

Threats

Major Threats
This species is primarily threatened by introduced predators (mainly foxes and cats), and by changes to the fire regime. These factors have resulted in a large decline in the species since European settlement, but the species has also declined due to the clearing of native vegetation and habitat modification.
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Management

Conservation Actions

Conservation Actions
This species occurs in a number of protected areas. Taxonomic work is needed to determine its relationship to I. auratus. Populations require close monitoring, especially for some subspecies that are particularly at risk. The Southern Brown Bandicoot has been reintroduced successfully to a number of locations. Reintroduction efforts should continue as well as exotic predator control. Fire management, maintenance of habitat integrity, and preservation of habitat are all important to this species.
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Wikipedia

Southern brown bandicoot

The southern brown bandicoot (Isoodon obesulus), also known as the quenda from the local Noongar tongue from South Western Australia, is a short-nosed bandicoot found mostly in southern Australia.[3]

This bandicoot shows some sexual dimorphism, with females being slightly smaller than males. The average male length is 330 mm (13 in), with a tail of 120 mm (4.7 in). Females are about 300 mm (12 in) shorter, with a 10 mm (0.39 in) shorter tail. Males weigh an average of 0.9 kg (2.0 lb), females 0.7 kg (1.5 lb). The fur of this marsupial is coarse and colored a dark greyish to yellowish brown, with the undersides a creamy-white. It has short, round ears.[3]

Reproduction is closely linked to local rainfall pattern, and many brown bandicoots breed all year around. A litter of up to 5 young is born after an 11-day gestation and is weaned at 2 months.[4]

While some authorities list as many as five subspecies (I. o. fusciventer, I. o. obesulus, I. o. peninsulae, I. o. affinus, I. o. nauticus), the most recent edition of Mammal Species of the World only lists I. o. nauticus as a valid subspecies, aside from the nominate; the others are given synonym status.[1]

In many areas of its range, the species is threatened but may be locally common where rainfall is high enough and vegetation cover is thick enough. Despite depredations from the introduced European Red Fox, in some regions it thrives, being reported anecdotally to be living on properties adjoining shopping and population centres such as Stirling in the Adelaide Hills.

Juvenile Southern Brown Bandicoot.

References

  1. ^ a b Groves, Colin P. (16 November 2005). "Order Peramelemorphia (pp. 38-42)". 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. 39. ISBN 978-0-8018-8221-0. OCLC 62265494. http://www.bucknell.edu/msw3/browse.asp?id=10900019. 
  2. ^ Friend, T., Morris, K., van Weenen, J., Winter, J. & Menkhorst, P. (2008). Isoodon obesulus. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 28 December 2008. Database entry includes justification for why this species is of least concern
  3. ^ a b "Quenda" (PDF). http://www.naturebase.net/pdf/plants_animals/living_with_wildlife/quendas.pdf. Retrieved 2007-07-23. 
  4. ^ Whitfield, Philip (1998). The Simon & Schuster Encyclopedia of Animals. New York: Marshall Editions Development Limited. p. 24. 
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