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| western ringtail possum | |
|---|---|
| Name | Western ringtail possum |
| Status | Critically Endangered |
| Status system | IUCN3.1 |
| Genus | Pseudocheirus |
| Species | occidentalis |
| Authority | (Peters, 1873) |
western ringtail possum
The western ringtail possum is a nocturnal arboreal marsupial endemic to southwestern Australia. It is noted for a prehensile tail and a folivorous diet, and it has been the subject of conservation actions involving federal, state and local agencies following severe population declines. Prominent institutions and legislatures including the Australian Government, Government of Western Australia, IUCN, Australian National University, Department of Biodiversity, Conservation and Attractions (Western Australia), World Wildlife Fund and regional councils have highlighted its status alongside other threatened taxa such as the Numbat, Western Swamp Tortoise, Carnaby's Black-Cockatoo and Greater Bilby.
Named by Wilhelm Peters in 1873, the species is placed in the genus Pseudocheirus, within the family Pseudocheiridae. Historical treatments referenced museums such as the Natural History Museum, London and the Western Australian Museum. Early taxonomic work was influenced by collectors and naturalists associated with expeditions tied to figures like John Forrest and institutions including the Royal Society of London. Modern revisions have involved researchers affiliated with the University of Western Australia, Monash University and the Australian Museum, and nomenclatural stability is maintained under the rules of the International Commission on Zoological Nomenclature.
Adults present a bushy prehensile tail, dense fur, and a characteristic curled posture when resting. Morphological comparisons have been made with congeners and other arboreal marsupials such as the Common Ringtail Possum and members of the Trichosurus genus like the Brushtail Possum. Veterinary and anatomical studies at facilities such as the Royal Perth Hospital and veterinary schools at Murdoch University document musculature and dentition adapted for folivory, and coat coloration varies regionally as noted in field guides from the Australian Museum and authors associated with the Field Naturalists Club of South Australia.
The species is endemic to the southwest corner of Australia, with historical records across landscapes managed by local shires including Shire of Augusta–Margaret River and Shire of Manjimup. It occupies riparian corridors, coastal scrub and eucalypt woodlands dominated by genera such as Eucalyptus and Melaleuca, and habitats affected by land uses overseen by agencies like the Western Australian Planning Commission and private landholders. Habitat fragmentation interfaces with infrastructure projects by entities such as Main Roads Western Australia and conservation reserves managed by the Parks and Wildlife Service (Western Australia).
Nocturnal and arboreal, the species forms loose social groups and constructs leaf nests or occupies tree hollows, aspects documented in studies funded by bodies like the Australian Research Council and environmental NGOs including Bush Heritage Australia. Predation pressure involves introduced species referenced in management plans by the Department of Agriculture, Water and the Environment and predator control programs by regional pest services. Ecological interactions include folivore–foliage dynamics studied in collaboration with botanists from the CSIRO and universities such as Griffith University and Curtin University.
Primarily folivorous, it feeds on leaves of Eucalyptus marginata (jarrah), Eucalyptus diversicolor (karri) and Agonis flexuosa (peppermint), with seasonal use of understory plants catalogued by botanists at the Western Australian Herbarium and ecologists associated with the Australian National Botanic Gardens. Nutritional studies drawing on methods used by teams at the University of Adelaide and La Trobe University have examined digestion, microbial fermentation and detoxification mechanisms analogous to those described for other folivores in publications from the Royal Society and journals supported by the Australian Academy of Science.
Breeding biology has been documented in field studies coordinated by conservation groups such as Greening Australia and universities including Deakin University. Females possess a marsupial pouch with development stages monitored in long-term studies funded by the Australian Government's National Environmental Science Program and state grants. Juvenile dispersal, maternal care and mortality rates are key parameters in population viability analyses prepared for agencies like the IUCN and local recovery teams involving the Department of Biodiversity, Conservation and Attractions (Western Australia).
Listed as Critically Endangered under national and international listings, threats include habitat loss from agricultural expansion regulated historically by bodies such as the Agricultural Wages Board (historical), urban development overseen by metropolitan councils like the City of Perth, altered fire regimes influenced by policies from the Department of Fire and Emergency Services (Western Australia), and predation by introduced predators associated with biosecurity issues managed by the Department of Agriculture, Water and the Environment. Climate change projections prepared by researchers at the CSIRO and the Commonwealth Scientific and Industrial Research Organisation indicate increased risk, while bushfire events similar to the 2019–20 Australian bushfire season have had localized impacts.
Recovery plans and translocation programs involve partnerships among the Government of Western Australia, non-governmental organizations such as Wildlife Australia and WWF-Australia, academia including the University of Western Australia, and local community groups. Measures include habitat restoration projects modeled after initiatives by Landcare Australia, predator control campaigns employing methods promoted by the Invasive Species Council, and monitoring using techniques developed with support from the Australian Centre for Ecological Analysis and Synthesis and state environmental offices. Legislative protection is enforced through state statutes administered by the Department of Biodiversity, Conservation and Attractions (Western Australia) and environmental assessments conducted under frameworks of the Environment Protection and Biodiversity Conservation Act 1999.
Category:Marsupials of Australia