Greater glider

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Greater glider [1]
Greater Glider (Petauroides volans) in a Eucalypt.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Diprotodontia
Family: Pseudocheiridae
Subfamily: Hemibelideinae
Genus: Petauroides
Thomas, 1888
Type species
Didelphis volans
Kerr, 1792
Species
Greater Glider area.png
Greater glider range
Synonyms

Schoinobates

The greater gliders are three species of large gliding marsupials in the genus Petauroides, all of which are found in eastern Australia. Until 2020 they were considered to be one species, Petauroides volans . In 2020 morphological and genetic differences, obtained using diversity arrays technology, showed there were three species subsumed under this one name. The two new species were named Petauroides armillatus and Petauroides minor . [2]

These species are not closely related to the Petaurus group of gliding marsupials but instead to the Lemuroid ringtail possum, Hemibelideus lemuroides, with which it shares the subfamily Hemibelideinae. [1]

The greater gliders are nocturnal and are solitary herbivores feeding almost exclusively on Eucalyptus leaves and buds. [3] Like their relative, the lemur-like ringtail, the southern greater glider is found in two forms: a sooty brown form and a grey-to-white form. [3] The central greater glider is instead silvery brown, while the northern greater glider is brownish-gray. [2]

The greater gliders are found in eucalypt forests from Mossman, Queensland, to Daylesford, Victoria. [3]

Taxonomy

Although the genus was formerly thought to be monotypic, there are now known to be three species in the genus: [2] [4]

The species are known to hybridize with one another near the edges of their ranges. [2]

Anatomy and physiology

Skeleton Petauroides volans skeleton.jpg
Skeleton

The three species differ in their size, with the northern greater glider only growing to the size of a small ringtail possum, while the southern greater glider grows to the size of a house cat. The central greater glider is intermediate between these two. [5]

Greater gliders have a head and body 39 to 43 centimetres (15 to 17 in) long, with the females generally being larger than the males. Their body is covered with a shaggy coat of fur that increases their apparent size, and the tail is long and bushy, ranging from 44 to 53 centimetres (17 to 21 in). The head is short with a pointed muzzle and their large ears are fringed and backed with long fur.

Each side of the body bears membranes stretching between the elbow and the ankle that give these animals the ability to perform controlled glides. This is in contrast to other gliding marsupials, such as the sugar glider, that have gliding membranes stretching from the wrists to the ankles. [6]

The feet have strongly recurved claws to grip onto bark or other surfaces. There are five toes on each foot. The first toe on the hind foot and the first two toes on the fore foot are opposable. [6]

The fur is soft and up to 60 millimetres (2.4 in) long. All three species have cream undersides and primarily differ in the coloration of their pelages. The northern greater glider has a brownish-gray coloration, the central greater glider has a dark silvery-brown coloration with dark brown face, legs, and tail, while the southern greater glider varies between a dark, almost black morph or a pale white and gray morph. Body mass varies from 1,600 grams (3.5 lb) in the southern greater glider of Victoria to 600 grams (1.3 lb) in the northern greater glider of north Queensland. [2]

Physiology

Heat management in the greater gliders is performed by licking extremities and the ventral body surface, and direct evaporation is the main method of cooling. They can also use their gliding membranes to reduce heat loss by increasing the layer of insulation at the skin surface. The gliders are not well equipped to handle high ambient temperatures as they inefficiently use water for evaporation via salivation despite arboreal habitats often having limited water accessibility. [7]

These gliders can digest low nutrient foliage, specifically eucalypt leaf matter, which contains a variety of phenolic and terpenoid compounds and a high concentration of lignified fibre. These animals can digest about 50–60% of the leaf during its passage through the gut. [8] Their guts have a specialized caecum that contains a population of bacteria that ferment food residues that remain undigested in the small intestine. [9] For a population in a eucalypt forest near Maryborough, Queensland, it has been calculated that their daily energy intake is about 1130 kJ, which is provided by about 45 to 50 grams (0.099 to 0.110 lb) of dry matter daily. [10]

Mature females will give birth to a single joey each year which is typically born in late autumn or early winter. The underdeveloped offspring will then spend the next four months within the pouch of the mother to suckle and develop, and will remain within the security of the pouch until nine months of age. [11]

Distribution and habitat

Greater gliders are found in southern Queensland, [12] eastern Australia, [13] southeastern New South Wales, [14] and the montane forests of the Victorian central highlands. [15] It is usually tracked via spotlighting on transects (considered to underestimate the actual population size), radio tagging and owl-call playback. [16] [17]

The greater gliders choose habitat based on several factors, the dominant factor being the presence of specific species of eucalypt. Distribution levels are higher in regions of montane forest containing manna gum ( E. viminalis ) and mountain gum ( E. dalrympleana , E. obliqua ). Furthermore, the presence of E. cypellocarpa appears to improve the quality of habitat for the greater gliders in forests dominated by E. obliqua. Another factor determining population density is elevation. Optimal levels are 845 m above sea level. [18] Within a forest of suitable habitat, they prefer overstorey basal areas in old-growth tree stands. [16]

Behaviour

Head of a dark morph southern greater glider Greater Glider444.jpg
Head of a dark morph southern greater glider

The greater gliders are primarily nocturnal, spending the night foraging in the highest parts of the forest canopy. During the day, they spend most of their time denning in hollowed trees, with each animal inhabiting up to twenty different dens within its home range. The dens are often lined with leaves and strips of bark. [6] [19] This is why spotlighting has become a popular way of locating members of a population. When a strong light is directed at the eyes of a glider, the observer will see two bright red orbs reflecting back. [17]

Within forests, males and females will have home territories and set borders between other individuals. For males, home territory ranges from 1.4 to 4.1 hectares (3.5 to 10.1 acres) while that of females is only 1.3 to 3.0 hectares (3.2 to 7.4 acres). Although home ranges may overlap, the animals remain generally solitary outside of the breeding season, and only rarely interact. In large and small patches of forest, the home territories will respectively be larger and smaller. [20]

The gliding posture of the greater gliders is unique among marsupials. The forelimbs are folded so that the wrists are tucked under the chin, giving the patagium a triangular outline when outstretched. These animals regularly glide between high trees, and are able to use their tails to assist in steering. They avoid traveling along the ground whenever possible, and are slow and clumsy if forced to do so. [6]

Greater gliders do not make any loud sounds, [21] and are thought to communicate through scent marking. The animal's cloacal glands give it a generally musty smell. [22] [23]

Ecology

Southern greater glider at Kioloa Greater Glider spotlight 1.JPG
Southern greater glider at Kioloa

Greater gliders subsist almost entirely on the young leaves and flower buds of select eucalypt species, especially Eucalyptus radiata , Eucalyptus viminalis , and Eucalyptus acmenoides . [22] Young leaves are preferred because they have higher concentration of protein, and lower concentration of lignocellulose which provides no nutrition. Overall, eucalypt leaves are a poor source of nutrients. [24]

Due to its nocturnal lifestyle, a natural predator of the gliders is the Powerful Owl (Ninox strenua). It hunts by concentrating in pockets within their relatively large home range until populations of prey are depleted to a level that causes the owl to shift hunting grounds. [25] Other predators include feral cats, introduced to Australia with the arrival of Europeans. [26]

Reproduction

The breeding season for greater gliders is relatively brief, lasting from February to May, with births occurring between April and June. Females have a relatively well-developed pouch, opening towards the forward part of the animal, and containing two teats. [6] Only a single young is born each year. [3]

At birth, the young weighs only around 0.27 grams (0.0095 oz), but it does not begin to leave the pouch for about four months, by which time it is already furred and well developed. After leaving the pouch, the mother may carry it about on her back until it is weaned at about seven months of age. The young are independent at nine months, and reach sexual maturity between 18 months and two years after birth. [6]

Greater gliders have been recorded living up to fifteen years. [27]

Northern greater glider (P. minor) at Ravenshoe, Queensland Greater Glider.jpg
Northern greater glider (P. minor) at Ravenshoe, Queensland

Evolution

Although previously thought to be related to the other gliding possums, the greater glider genus, Petauroides, is now known to be most closely related to the ringtail possums, and especially to the lemur-like ringtail possum, from which its ancestors diverged around 18 million years ago. In contrast, it diverged from the gliding possums much earlier, around 36 million years ago. [28] Fossils of greater gliders are known from the late Pleistocene onwards, and show that the animal was once more widespread and inhabited other areas including parts of South Australia. [6]

Conservation status

Greater gliders as a whole are listed as endangered nationally, in Queensland, New South Wales, the Australian Capital Territory and Victoria, under the EPBC Act, the Queensland Nature Conservation Act and Victorian Advisory List of Threatened Vertebrate Fauna. [29] Given the split into three species, and the uniquely threatened status of the southern species, this may need revision. [5]

Related Research Articles

<span class="mw-page-title-main">Sugar glider</span> Species of Australian marsupial

The sugar glider is a small, omnivorous, arboreal, and nocturnal gliding possum. The common name refers to its predilection for sugary foods such as sap and nectar and its ability to glide through the air, much like a flying squirrel. They have very similar habits and appearance to the flying squirrel, despite not being closely related—an example of convergent evolution. The scientific name, Petaurus breviceps, translates from Latin as "short-headed rope-dancer", a reference to their canopy acrobatics.

<span class="mw-page-title-main">Phalangeriformes</span> Suborder of arboreal marsupials

Phalangeriformes is a paraphyletic suborder of about 70 species of small to medium-sized arboreal marsupials native to Australia, New Guinea, and Sulawesi. The species are commonly known as possums, gliders, and cuscus. The common name "possum" for various Phalangeriformes species derives from the creatures' resemblance to the opossums of the Americas. However, although opossums are also marsupials, Australasian possums are more closely related to other Australasian marsupials such as kangaroos.

<span class="mw-page-title-main">Feathertail glider</span> Species of mammal (Acrobates pygmaeus; marsupial)

The feathertail glider, also known as the pygmy gliding possum, pygmy glider, pygmy phalanger, flying phalanger and flying mouse, is a species of marsupial native to eastern Australia. It is the world's smallest gliding mammal and is named for its long feather-shaped tail.

<span class="mw-page-title-main">Squirrel glider</span> Species of marsupial

The squirrel glider is a nocturnal gliding possum. The squirrel glider is one of the wrist-winged gliders of the genus Petaurus.

<i>Petaurus</i> Genus of marsupials

The genus Petaurus contains flying phalangers or wrist-winged gliders, a group of arboreal possums native to Australia, New Guinea, and surrounding islands. There are eight species: the sugar glider, savanna glider, Krefft's glider, squirrel glider, mahogany glider, northern glider, yellow-bellied glider and Biak glider.

<span class="mw-page-title-main">Common ringtail possum</span> Species of marsupial

The common ringtail possum is an Australian marsupial.

<span class="mw-page-title-main">Pseudocheiridae</span> Family of marsupials

Pseudocheiridae is a family of arboreal marsupials containing 17 extant species of ringtailed possums and close relatives. They are found in forested areas and shrublands throughout Australia and New Guinea.

<span class="mw-page-title-main">Powerful owl</span> Species of owl

The powerful owl, a species of owl native to south-eastern and eastern Australia, is the largest owl on the continent. It is found in coastal areas and in the Great Dividing Range, rarely more than 200 km (120 mi) inland. The IUCN Red List of Threatened Species also refers to this species as the powerful boobook.

<span class="mw-page-title-main">Mahogany glider</span> Species of marsupial

The mahogany glider is an endangered gliding possum native to a small region of coastal Queensland in Australia.

<span class="mw-page-title-main">Yellow-bellied glider</span> Species of marsupial

The yellow-bellied glider, also known as the fluffy glider, is an arboreal and nocturnal gliding possum that lives in native eucalypt forests in eastern Australia, from northern Queensland south to Victoria.

<span class="mw-page-title-main">Lemuroid ringtail possum</span> Species of marsupial

The lemuroid ringtail possum, also known as the lemur-like ringtail possum or the brushy-tailed ringtail, is a truly singular member of the ringtail possum group. It was once thought that they were greater gliders ; Hemibelideus literally translates as "half-glider". Named for their facial characteristics visually similar to the unrelated primate lemurs, with short snouts, large, forward-facing eyes and small ears, they are similar to other gliding possums in their musculo-skeletal adaptations to accommodate a leaping lifestyle. Their long, prehensile tail is a further adaptation to their arboreal habitat.

<span class="mw-page-title-main">Lesser sooty owl</span> Species of owl

The lesser sooty owl is a medium-sized barn owl endemic to the wet tropics region of Australia. Once considered a subspecies of the greater sooty owl, it is distinguished by its dark plumage, heavier spotting, and higher-pitched call. The lesser sooty owl has a limited range within northeastern Australia and primarily lives in dark, sheltered areas of the rainforest.

Slender ringtail possum or Small ringtail possum (Pseudochirulus), also known as the ringtail possum, is a genus of marsupial in the family Pseudocheiridae native to Indonesia, Papua New Guinea and Queensland, Australia. Pseudochirulus live on trees and their diet mainly consists of leaves. The ringtail possums are related to five other genera Hemibelideus, Petauroides, Petropseudes, Pseudocheirus and Pseudochirops.

<span class="mw-page-title-main">Mountain brushtail possum</span> Species of marsupial

The mountain brushtail possum, or southern bobuck, is a nocturnal, semi-arboreal marsupial of the family Phalangeridae native to southeastern Australia. It was not described as a separate species until 2002.

<span class="mw-page-title-main">Western ringtail possum</span> Species of possum found in Southwest Australia

The western ringtail possum or ngwayir is a species of possum found in a small area of Southwest Australia. They are a cat-sized marsupial with a stocky build, dark greyish-brown fur, pale underparts and a long prehensile tail with a whitish tip. Ngwayir forage at night through the upper canopy of trees, feeding on young leaves, flowers and fruit, especially in groves of the weeping peppermint Agonis flexuosa. Breeding occurs mainly during the winter, the single juvenile emerging from the pouch after about three months. The population has declined by more than 95% since British settlement, due to clearing of habitat, fire and the introduction of the red fox Vulpes vulpes, and is classified as Critically Endangered. The population in most areas has catastrophically declined or become locally extinct, but strongholds remain in the urbanised areas near Busselton and Albany.

<span class="mw-page-title-main">Petauroidea</span> Superfamily of marsupials

Petauroidea is a superfamily of marsupials from Australia and New Guinea. It is part of the suborder Phalangeriformes within the order Diprotodontia, which also includes, among others, wombats, kangaroos, cuscuses. The superfamily Phalangeroidea, including cuscuses and brushtail possums and pygmy possums, is the immediate sister group of the Petauroidea. The earliest fossils from this superfamily are from the Oligocene of the Geilston Bay fossil site in Tasmania.

The Warby-Ovens National Park is a national park located on the lands of the Bangerang clan of the Yorta Yorta Nation in the Hume region of Victoria, Australia near Killawara. The 14,655-hectare (36,210-acre) national park is situated approximately 10 kilometres (6.2 mi) west of Wangaratta and 240 kilometres (150 mi) northeast of Melbourne.

<span class="mw-page-title-main">Central greater glider</span> Species of gliding marsupial

The central greater glider is a species of gliding marsupial native to the central coast of eastern Australia.

<span class="mw-page-title-main">Northern greater glider</span> Species of gliding marsupial

The northern greater glider is a species of gliding marsupial endemic to the forests of north-central Queensland, Australia.

<span class="mw-page-title-main">Southern greater glider</span> Species of marsupial

The southern greater glider, also known as the southern and central greater glider, is a species of large gliding marsupial native to the forests of southeastern Australia. It is a vulnerable species per the IUCN Red List classification, but since 5 July 2022 is listed as endangered under the EPBC Act in Australia. The main threats to its survival are climate change and logging.

References

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  8. ↑ Foley, W. J.; Lassak, E. V.; Brophy, J. (1987). "Digestion and absorption of eucalyptus essential oils in the Greater Glider Petauroides volans and Brushtail Possum Trichosurus vulpecula". Journal of Chemical Ecology. 13 (11): 2115–2130. doi:10.1007/BF01012875. PMID   24301544. S2CID   8460072.
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  13. ↑ Taylor, A. C.; Kraiaijeveld, K.; Lindenmayer, D. B. (2002). "Microsatellites for the greater glider, Petauroides volans". Molecular Ecology Notes. 2 (1): 57–59. doi:10.1046/j.1471-8286.2002.00148.x.
  14. ↑ Viggers, K. L.; Lindenmayer, D. B. (2001). "Hematological and Plasma Biochemical Values of the Greater Glider in Australia". Journal of Wildlife Diseases. 37 (2): 370–374. doi: 10.7589/0090-3558-37.2.370 . PMID   11310891.
  15. ↑ Incoll, R. D.; Loyn, R. H. (2001). "The occurrence of gliding possums in old-growth forest patches of mountain ash (Eucalyptus regnans) in the Central Highlands of Victoria". Biological Conservation. 98 (1). Ward, S. J.; Cunningham, R. B.; Donnelly, C. F.: 77–88. Bibcode:2001BCons..98...77I. doi:10.1016/S0006-3207(00)00144-0.
  16. 1 2 Incoll, R. D.; Loyn, R. H.; Ward, S. J.; Cunningham, R. B.; Donnelly, C. F. (2001). "The occurrence of gliding possums in old-growth forest patches of mountain ash (Eucalyptus regnans) in the Central Highlands of Victoria". Biological Conservation. 98 (1): 77–88. Bibcode:2001BCons..98...77I. doi:10.1016/S0006-3207(00)00144-0.
  17. 1 2 Lindenmayer, D. B.; Cunningham, R. B.; Donnelly, C. F.; Incoll, R. D.; Pope, M. L.; Tribolet, C. R.; Viggers, K. L.; Welsh, A. H. (2001). "How effective is spotlighting for detecting the greater glider (Petauroides volans)?". Wildlife Research. 28 (1): 105–109. doi:10.1071/WR00002.
  18. ↑ Kavanagh, Rodney P. (2000). "Effects of variable-intensity logging and the influence of habitat variables on the distribution of the Greater Glider Peaturoides volans in montane forest, southeastern New South Wales". Pacific Conservation Biology. 6 (1): 18–30. doi:10.1071/PC000018.
  19. ↑ Smith, G.C.; et al. (2007). "Home range and habitat use of a low-density population of greater gliders, Petauroides volans (Pseudocheiridae: Marsupialia), in a hollow-limiting environment". Wildlife Research. 34 (6): 472–483. doi:10.1071/WR06063.
  20. ↑ Pope, M. L.; Lindenmayer, D. B.; Cunningham, R. B. (2004). "Patch use by the greater glider (Petauroides volans) in a fragmented forest ecosystem. I. Home range size and movements". Wildlife Research. 31 (6): 559–568. doi:10.1071/WR02110.
  21. ↑ Borsboom, A. (1982). "Agonistic interactions between bats and arboreal marsupials". Australian Mammalogy. 5 (4): 281–282. doi:10.1071/AM82030. S2CID   254726103.
  22. 1 2 Comport, S. S.; Ward, S. J.; Foley, W. J. (1996). "Home ranges, time budgets and food-tree use in a high-density tropical population of greater gliders, Petauroides volans minor (Pseudocheiridae: Marsupialia)" (PDF). Wildlife Research. 23 (4): 409–419. doi:10.1071/WR9960401. Archived from the original (PDF) on 2011-03-10. Retrieved 2011-08-17.
  23. ↑ Pockets Pets Team. "Pocket Pets". GRE, Inc. Retrieved 6 November 2012.
  24. ↑ Kavanagh, R. P.; Lambert, M. J. (1990). "Food selection by the Greater Glider Petauroides volans: is foliar nitrogen a determinant of habitat quality?". Australian Wildlife Research. 17 (3): 285–300. doi:10.1071/WR9900285.
  25. ↑ Kavanagh, R. P. (1988). "The impact of predation by the Powerful Owl Ninox strenua on a population of the Greater Glider Petauroides volans". Australian Journal of Ecology. 13 (4): 445–450. doi:10.1111/j.1442-9993.1988.tb00992.x.
  26. ↑ "Greater Glider". Gliders in the Spotlight. Wildlife Preservation Society of Queensland. Archived from the original on 2008-07-21. Retrieved 2008-05-05.
  27. ↑ Lindenmeyer, D.B. (1997). "Differences in the biology and ecology of arboreal marsupials in forests of southeastern Australia". Journal of Mammalogy. 78 (4): 1117–1127. doi: 10.2307/1383054 . JSTOR   1383054.
  28. ↑ Springer, M.S.; et al. (1992). "Relations among ringtail possums (Marsupialia, Pseudocheiridae) based on DNA–DNA hybridization". Australian Journal of Zoology. 40 (4): 423–435. doi:10.1071/ZO9920423.
  29. ↑ "Petauroides volans — Greater Glider (southern and central)". Species Profile and Threats Database. 2024. Retrieved 31 January 2024.

Bibliography

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