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Isoodon obesulus 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Peramelemorphia Peramelidae

Scientific Name: Isoodon obesulus
Species Authority: (Shaw, 1797)
Common Name(s):
English Southern Brown Bandicoot, Nuyts Southern Brown Bandicoot, Quenda
French Péramèle Obése À Ventre Sombre
Taxonomic Notes:

The taxonomy of the Isoodon obesulus complex has been unsettled. Westerman et al. (2012) concluded that the subspecies I. o. peninsulae was more closely related to I. auratus than I. obesulus, and should be either transferred to that species or raised to a species itself. Following Pope et al. (2001), Zenger et al. (2005) and Westerman et al. (2012), the formerly recognised subspecies I. o. affinis and I. o. nauticus are included here in I. o. obesulus, leaving only one other subspecies, I. o. fusciventer from south-western Australia. We have followed this arrangement.

I. o. obesulus (south-eastern Australia) is Near Threatened;

I. o. fusciventer (south-western Australia) is Least Concern.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2016
Date Assessed: 2014-05-16
Assessor(s): Burbidge, A.A. & Woinarski, J.
Reviewer(s): Pacifici, M.
Contributor(s): Comer, S., Copley, P., Maclagan, S., Menkhorst, P., Morris, K., Murray, A. & Westerman, M.
Justification:
The Southern Brown Bandicoot, while having suffered drastic declines in the past, remains relatively widespread and has recovered in numbers in south-western Australia and parts of south-eastern Australia following fox control.
Previously published Red List assessments:

Geographic Range [top]

Range Description:

The Southern Brown Bandicoot has a fragmented distribution occurring in the south-west of Western Australia (including Daw Island), small parts of South Australia (including Kangaroo Island and some islands in the Nuyts Archipelago), southern Victoria, Tasmania (including Bruny, Three Hummock and West Sister Islands) and southern coastal New South Wales. In South Australia, its range has contracted substantially due to habitat clearance, but subpopulations remain in the South East (Le Duff and Stratman 2009), Mt Lofty Ranges (Long 2010) and on Kangaroo Island (Jones et al. 2010).

Countries occurrence:
Native:
Australia (New South Wales, South Australia, Tasmania, Victoria, Western Australia)
Additional data:
Estimated area of occupancy (AOO) - km2:3500Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:1186000
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:10-50Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:No
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The Southern Brown Bandicoot is locally abundant in Western Australia where fox control is in place, and is naturally abundant in Tasmania and on offshore islands. In Victoria it has declined greatly in the greater Melbourne region but occurs extensively in East Gippsland, Wilsons Promontory, Otway Ranges, Grampian Range and the south-west coastal plains and has increased in abundance where fox control is in place. In New South Wales it has also declined greatly but remains common at some localities.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:10000-100000Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
No. of subpopulations:10-50Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:

The Southern Brown Bandicoot prefers dense vegetation, including wetland fringes and heathland. It has responded well to fox control, with many populations in public land where fox control occurs now at greater abundance than previously (Morris et al. 1998). Some subpopulations within fox-proof fences have reached very high densities.

The Southern Brown Bandicoot is omnivorous, eating both plants and animals. It forages for food mainly by digging in the leaf litter and soil to find insects, fungi, plant root nodules and bulbs. It also eats fruit, seeds and other plant material found above ground. Bandicoots prefer to live in areas with thick vegetation and construct nests under plants on the ground. They do not create their own burrow, but occasionally use the burrows of other species (Paull 2008).

Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:No
Generation Length (years):2
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): The Southern Brown Bandicoot 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. Maintenance of fox control is essential to prevent a continuing decline.

Conservation Actions [top]

Conservation Actions:

The Southern Brown Bandicoot occurs in many protected areas, as well as managed forests and private land. Conservation objective is to maintain current range and abundance for most subpopulations, and to improve status of I. o. obesulus in south-eastern Australia. Maintenance of fox control in south west and south east mainland Australia is required to prevent a continuing decline.


Citation: Burbidge, A.A. & Woinarski, J. 2016. Isoodon obesulus. The IUCN Red List of Threatened Species 2016: e.T40553A21966368. . Downloaded on 24 February 2017.
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