Gymnobelideus leadbeateri 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Diprotodontia Petauridae

Scientific Name: Gymnobelideus leadbeateri
Species Authority: McCoy, 1867
Common Name(s):
English Leadbeater's Possum

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Menkhorst, P.
Reviewer(s): Lamoreux, J. & Hilton-Taylor, C. (Global Mammal Assessment Team)
Listed as Endangered because it has an extent of occurrence that is less than 5,000 km2, its distribution is severely fragmented, and there is continuing decline in the extent and quality of its habitat.
Previously published Red List assessments:
1996 Endangered (EN)
1994 Endangered (E)
1990 Vulnerable (V)
1988 Vulnerable (V)
1986 Endangered (E)
1982 Endangered (E)
1965 Status inadequately known-survey required or data sought

Geographic Range [top]

Range Description:This species is endemic to Australia, where it has a limited distribution (<3,500 km²) near the western limit of Victoria's eastern highlands from 500-1,500 m asl. There is a small, isolated population that occupies swamp forest at Yellingbo Conservation Nature Reserve at around 80 m (Smith and Harley 2008).
Countries occurrence:
Australia (Victoria)
Lower elevation limit (metres):80
Upper elevation limit (metres):1500
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There are about 200 individuals at Yellingbo, and the main population is estimated at around 2,000 mature individuals. There is predicted to be a decline of approximately 90% over the next 30 years due to loss of den trees and suitable nesting habitat (Smith and Lindenmayer 1992).
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:Leadbeater's Possum is a nocturnal, arboreal species that spends its day in tree hollows. Its diet mainly consists of exudates from trees and to a lesser extent arthropods (Smith 1984).
Optimum habitat for Leadbeater's Possum is a regenerating or uneven-aged Ash forest with a dense understorey of Acacia trees and an ample supply of old hollow trees. The occurrence and quality of habitat is primarily determined by patterns of successional change and stand development resulting from disturbance, such as past wildfires and timber harvesting operations. Regrowth from the 1939 wildfires, combined with fire-killed remnants of mature forest, has provided abundant feeding and nesting habitat during the last 30 years.
Older aged and mixed aged forest containing live hollow-bearing trees also support populations of Leadbeater's Possum, although not in the same high densities that can be found in suitable regrowth forests. The role, however, of these suboptimal forests in the medium-term will be critical for conservation of the species. These forests are not subject to a rapid decline in habitat suitability that is predicted to occur in current high value habitat regrowth forests. Older aged forest and mixed aged forest with hollow-bearing trees and a low occurrence of wattles are defined as potentially optimum habitat because of their potential to become optimum in the short term (<30 years), as a result of natural or deliberate disturbance.

Threats [top]

Major Threat(s): This species is heavily dependent on old trees, and fire-killed remnants that are rapidly decaying and falling over. Recruitment of suitable hollows, used for shelter and breeding, is very slow. The long-term viability of habitat in mature and mixed aged forests is threatened by wildfires and some timber harvesting practices. The species and its remnant habitat also are closely tied to a narrow set of climatic conditions that could be severely affected by global warming (Lindenmayer et al. 1991).

Conservation Actions [top]

Conservation Actions: Leadbeater's Possum occurs in a number of protected areas and is listed as a threatened species both nationally and within Victoria. A recovery plan for the species was prepared (Macfarlane et al. 1998), as well as several conservation strategies (e.g., Smith 1982; Smith et al. 1985; Macfarlane and Seebeck 1991; Lindenmayer et al. 1991; Lindenmayer and Possingham 1994), but these are now largely out of date. Populations of this species have been monitored over the last several years conducted by numerous volunteers and public awareness of the plight of this species is high (Smith and Harley 2008). Research into the effects of fire and ways to improve timber harvesting techniques are important.

The species’ dependence on tree hollows that resulted from burnt remnant trees from the 1939 fires has led to dire predictions about its population trend over the next 30 years as these trees continue to collapse. The use of nest boxes as a management tool that has received a lot of attention as one way to possibly ameliorate the imminent cavity shortage. Research in the central highlands suggests that nest boxes receive a low rate of occupancy and would be ineffective as a large-scale solution to the problem (Lindenmayer et al. 2003). This result, however, has been questioned as nest box occupancy rates are much higher at Yellingbo (Beyer and Goldingay 2006; Harley 2006). Although the habitats are very different between the Yellingbo outlier and the central highlands the discrepancy in occupancy rates is thought to have more to do with box dimensions and placement than the difference in location, thus leaving open the possibility of nest boxes as a useful management tool for the species (Beyer and Goldingay 2006; Harley 2006).

Approximately 31% of its Ash forest habitat is protected, while about 69% is allocated for timber production. Timber harvesting is obviously a major factor of any recovery plan for Leadbeater's Possum (Lindenmayer 1996). Large-scale clear-cutting and even-aged stand management is detrimental to the species, and there have been efforts to adopt harvest practices that are compatible with the conservation of the species. The preservation of more large trees with hollows and a dense habitat structure with an understorey of Acacias is essential (Smith and Lindenmayer 1992; Smith and Harley 2008). Recently management recommendations for timber harvesting for Leadbeater's Possum has become very sophisticated, including, for instance, detailed recommendations for post fire timber salvage that protects patches of tall trees (Lindenmayer and Ough 2006). Further research is needed into timber management practices, and much work will be required to have these implemented.

Classifications [top]

1. Forest -> 1.4. Forest - Temperate
suitability: Suitable  
1. Forest -> 1.8. Forest - Subtropical/Tropical Swamp
suitability: Suitable  
2. Land/water management -> 2.1. Site/area management
2. Land/water management -> 2.3. Habitat & natural process restoration
3. Species management -> 3.2. Species recovery

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
  Conservation sites identified:Yes, over entire range
In-Place Species Management
In-Place Education
  Subject to recent education and awareness programmes:Yes
5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.5. Motivation Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

7. Natural system modifications -> 7.1. Fire & fire suppression -> 7.1.3. Trend Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

7. Natural system modifications -> 7.3. Other ecosystem modifications
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

11. Climate change & severe weather -> 11.1. Habitat shifting & alteration
♦ timing: Future    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

2. Conservation Planning -> 2.1. Species Action/Recovery Plan
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Beyer, G. L. and Goldingay, R. L. 2006. The value of nest boxes in the research and management of Australian hollow-using arboreal marsupials. Wildlife Research 33: 161-174.

Harley, D. K. P. 2006. A role for nest boxes in the conservation of Leadbeater's possum (Gymnobelideus leadbeateri). Wildlife Research 33: 385-395.

Lindenmayer, D. B. 1996. Wildlife and Woodchips. Leadbeater's Possum: A test case for sustainable forestry. UNSW Press, Sydney, Australia.

Lindenmayer, D. B. and Ough, K. 2006. Salvage logging in the montane ash Eucalypt forests of the Central Highlands of Victoria and its potential impacts on biodiversity. Conservation Biology 20: 1005-1015.

Lindenmayer, D. B. and Possingham, H. P. 1994. The risk of extinction: ranking management options for Leadbeater's Possum using population viability analysis. Centre for Resource and Environmental Studies, the Australian National University, Canberra, Australia.

Lindenmayer, D. B., Cunningham, R. B., Tanton, M. T. and Smith, A. P. 1991. The conservation of arboreal marsupials in the montane ash forests of the Central Highlands of Victoria, south-east Australia: III. Biological Conservation 56: 295-315.

Lindenmayer, D. B., MacGregor, C. I., Cunningham, R. B., Incoll, R. D., Crane, M., Rawlins, D. and Michael, D. R. 2003. The use of nest boxes by arboreal marsupials in the forests of the Central Highlands of Victoria. Wildlife Research 30: 259-264.

Macfarlane, M. A. and Seebeck, J. H. 1991. Draft management strategies for the conservation of Leadbeater's Possum, Gymnobelideus leadbeateri, in Victoria. Arthur Rylah Institute Technical Report Series III.

Macfarlane, M., Smith, J. and Lowe, K. 1997. Leadbeater's Possum Recovery Plan 1997-2002. Flora and Fauna Branch, Department of Natural Resources and Environment, Victoria, Australia.

Smith, A. P. 1982. Leadbeater's Possum and its management. In: R. H. Groves and W. D. L. Ride (eds), Species at Risk: Research in Australia, pp. 129-145. Australian Academy of Science, Canberra, Australia.

Smith, A. P. 1984. Diet of Leadbeater's Possum, Gymnobelideus leadbeateri (Marsupialia). Australian Wildlife Research 11: 265-273.

Smith, A. P. and Harley, D. K. P. 2008. Leadbeater's Possum, Gymnobelideus leadbeateri. In: S. Van Dyck and R. Strahan (eds), The mammals of Australia. Third Edition, pp. 226-228. Reed New Holland, Sydney, Australia.

Smith, A. P. and Lindenmayer, D. B. 1992. Forest succession, timber production and conservation of Leadbeater's Possum (Gymnobelideus leadbeateri Marsupialia: Petauridae). Forest Ecology and Management 49: 311-332.

Smith, A. P., Lindenmayer, D. and Suckling, G. C. 1985. The ecology and management of Leadbeater's Possum. Research report to World Wildlife Fund Australia for Project 51, University of New England, Armidale.

Citation: Menkhorst, P. 2008. Gymnobelideus leadbeateri. In: The IUCN Red List of Threatened Species 2008: e.T9564A13001448. . Downloaded on 26 June 2016.
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