Swamp wallaby

Last updated

Swamp wallaby
Wallabia bicolor Jenolan Caves portrait.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Diprotodontia
Family: Macropodidae
Subfamily: Macropodinae
Genus: Wallabia
Trouessart, 1905 [2]
Species:
W. bicolor
Binomial name
Wallabia bicolor
(Desmarest, 1804)
Swamp Wallaby IUCN Range.png
Swamp wallaby range

The swamp wallaby (Wallabia bicolor) is a small macropod marsupial of eastern Australia. [3] This wallaby is also commonly known as the black wallaby, with other names including black-tailed wallaby, fern wallaby, black pademelon , stinker (in Queensland), and black stinker (in New South Wales) on account of its characteristic swampy odour.

Contents

The swamp wallaby is the only living member of the genus Wallabia. [4]

Etymology

Historic names for the swamp wallaby include Aroe kangaroo and Macropus ualabatus, as well as banggarai in the Dharawal language. [5]

Habitat and distribution

The swamp wallaby is found from the northernmost areas of Cape York Peninsula in Queensland, down the entire east coast and around to southwestern Victoria. It was formerly found throughout southeastern South Australia, but is now rare or absent from that region. [4]

It inhabits thick undergrowth in forests and woodlands, or shelters during the day in thick grass or ferns, emerging at night to feed. Brigalow scrub in Queensland is a particularly favoured habitat. [4]

Note the light cheek stripe Wallabia bicolor Jenolan Caves portrait.jpg
Note the light cheek stripe
A "pinky" stage pouch joey Swamp wallaby joey.jpg
A "pinky" stage pouch joey
A "young at foot" joey Swamp-Wallaby-joey-Wallabia-bicolor-cropped.jpg
A "young at foot" joey

Description

The species name bicolor comes from the distinct colouring variation, with the typical grey coat of the macropods varied with a dark brown to black region on the back, and light yellow to rufous orange on the chest. A light coloured cheek stripe is usually present, and extremities of the body generally show a darker colouring, except for the tip of the tail, which is often white. [3]

The gait differs from other wallabies, with the swamp wallaby carrying its head low and its tail out straight. [4]

The average length is 76 cm (30 in) for males, and 70 cm (28 in) for females (excluding the tail). The tail in both sexes is approximately equal in length to the rest of the body. Average weight for males is 17 kg (37 lb), females averaging 13 kg (29 lb). [4]

The swamp wallaby has seven carpal bones in the wrist (humans have eight). [6]

Reproduction

The swamp wallaby becomes reproductively fertile between 15 and 18 months of age, and can breed throughout the year. Gestation is from 33 to 38 days, leading to a single young. The young is carried in the pouch for 8 to 9 months, but will continue to suckle until about 15 months.

The swamp wallaby exhibits an unusual form of embryonic diapause, differing from other marsupials in having its gestation period longer than its oestrous cycle. [4] This timing makes it possible for swamp wallaby females to overlap two pregnancies, gestating both an embryo and a fetus at the same time. The swamp wallaby ovulates, mates, conceives and forms a new embryo one to two days before the birth of their full-term fetus. Consequently, females are continuously pregnant throughout their reproductive life. [7]

The swamp wallaby is notable for having a distinct sex-chromosome system from most other Theria (the subclass that includes marsupials and placental mammals). Females are characterized by the XX pair typical of therians, but males have one X chromosome and two non-sequence homology Y chromosomes. This system is thought to arise from a series of chromosomal fusions over the last 6 million years. [8]

A swamp wallaby feeding on leaves Image-Swamp-Wallaby-Feeding-4,-Vic,-Jan.2008.jpg
A swamp wallaby feeding on leaves

Nutrition

The swamp wallaby is typically a solitary animal, but often aggregates into groups when feeding. [3] It will eat a wide range of food plants, depending on availability, including shrubs, pasture, agricultural crops, and native and exotic vegetation. It appears to be able to tolerate a variety of plants poisonous to many other animals, including brackens, hemlock and lantana. [4]

The ideal diet appears to involve browsing on shrubs and bushes, rather than grazing on grasses. This is unusual in wallabies and other macropods, which typically prefer grazing. Tooth structure reflects this preference for browsing, with the shape of the molars differing from other wallabies. The fourth premolar is retained through life, and is shaped for cutting through coarse plant material. [4]

There is evidence that the swamp wallaby is an opportunist taking advantage of food sources when they become available, such as fungi, bark and algae. There is also one reported case of the consumption of carrion. [9]

Taxonomy

Several physical and behavioral characteristics make the swamp wallaby different enough from other wallabies that it is placed apart in its own genus, Wallabia. [10] [3] However, genetic evidence (e.g. Dodt et al, 2017) demonstrates that Wallabia is embedded within the large genus Macropus, necessitating reclassification of this species in the future.

Threats

Anthropogenic actions, such as the increase in roads through swamp wallaby habitats, are a threat to their survival. They are frequently seen near the side of roads, leading to a larger number becoming roadkill. [11]

Other sources of threat for the swamp wallaby are their predators, which include dingoes, eagles and wild dogs. [12]

Related Research Articles

<span class="mw-page-title-main">Kangaroo</span> Marsupial of the family Macropodidae

Kangaroos are marsupials from the family Macropodidae. In common use the term is used to describe the largest species from this family, the red kangaroo, as well as the antilopine kangaroo, eastern grey kangaroo, and western grey kangaroo. Kangaroos are indigenous to Australia and New Guinea. The Australian government estimates that 42.8 million kangaroos lived within the commercial harvest areas of Australia in 2019, down from 53.2 million in 2013.

<span class="mw-page-title-main">Wallaby</span> Macropods of Australia and New Guinea

A wallaby is a small or middle-sized macropod native to Australia and New Guinea, with introduced populations in New Zealand, Hawaii, the United Kingdom and other countries. They belong to the same taxonomic family as kangaroos and sometimes the same genus, but kangaroos are specifically categorised into the four largest species of the family. The term "wallaby" is an informal designation generally used for any macropod that is smaller than a kangaroo or a wallaroo that has not been designated otherwise.

Taunton National Park is situated near the town of Dingo approximately 135 km inland from Rockhampton in eastern Central Queensland, Australia. The park encompasses an area of 11,626 ha within the Northern Brigalow Belt bioregion of Queensland; a region widely recognised to contain considerable biodiversity.

<span class="mw-page-title-main">Macropodidae</span> Family of marsupial mammals

Macropodidae is a family of marsupials that includes kangaroos, wallabies, tree-kangaroos, wallaroos, pademelons, quokkas, and several other groups. These genera are allied to the suborder Macropodiformes, containing other macropods, and are native to the Australian continent, New Guinea and nearby islands.

<span class="mw-page-title-main">Eastern grey kangaroo</span> Species of kangaroo

The eastern grey kangaroo is a marsupial found in the eastern third of Australia, with a population of several million. It is also known as the great grey kangaroo and the forester kangaroo. Although a big eastern grey male can typically weigh up to 66 kg (146 lb) and have a length of well over 2 m, the scientific name, Macropus giganteus, is misleading: the red kangaroo of the semi-arid inland is larger, weighing up to 90 kg (200 lb).

<span class="mw-page-title-main">Parma wallaby</span> Species of marsupial

The parma wallaby is a small marsupial macropod mammal native to forests and densely-vegetated areas of northeastern New South Wales, Australia, close to the border with Queensland. There is also an introduced population found in and around Rodney District, just north of Auckland, New Zealand. About the size of a stout cat, it lives mainly under thick plant cover, and is only active at night when it emerges to feed on grasses and small plants. It is the smallest of the wallabies and carries its young in a pouch, as with other marsupials. Shy and elusive, it was believed extinct until its rediscovery in the 1960s.

<span class="mw-page-title-main">Tammar wallaby</span> A small macropod native to South and Western Australia

The tammar wallaby, also known as the dama wallaby or darma wallaby, is a small macropod native to South and Western Australia. Though its geographical range has been severely reduced since European colonisation, the tammar wallaby remains common within its reduced range and is listed as "Least Concern" by the International Union for Conservation of Nature (IUCN). It has been introduced to New Zealand and reintroduced to some areas of Australia where it had been previously extirpated. Skull variations differentiate between tammar wallabies from Western Australia, Kangaroo Island, and mainland South Australia, making them distinct population groups.

<span class="mw-page-title-main">Bridled nail-tail wallaby</span> Species of marsupial

The bridled nail-tail wallaby, also known as the bridled nail-tailed wallaby, bridled nailtail wallaby, bridled wallaby, merrin, and flashjack, is a vulnerable species of macropod. It is a small wallaby found in three isolated areas in Queensland, Australia, and whose population is declining. In early 2019 the total population of the species was estimated to be fewer than 500 mature individuals in the wild and 2285 in captivity.

<span class="mw-page-title-main">Agile wallaby</span> Species of marsupial

The agile wallaby, also known as the sandy wallaby, is a species of wallaby found in northern Australia and southern New Guinea. It is the most common wallaby in north Australia. The agile wallaby is a sandy colour, becoming paler below. It is sometimes solitary and at other times sociable and grazes on grasses and other plants. The agile wallaby is not considered threatened.

<span class="mw-page-title-main">Western brush wallaby</span> Species of marsupial

The western brush wallaby, also known as the black-gloved wallaby, is a species of wallaby found in the southwestern coastal region of Western Australia. The wallaby's main threat is predation by the introduced red fox. The IUCN lists the western brush wallaby as Least Concern, as it remains fairly widespread and the population is believed to be stable or increasing, as a result of red fox control programs.

<span class="mw-page-title-main">Antilopine kangaroo</span> Species of marsupial

The antilopine kangaroo, also known as the antilopine wallaroo or the antilopine wallaby, is a species of macropod found in northern Australia: in Cape York Peninsula in Queensland, the Top End of the Northern Territory, and the Kimberley region of Western Australia. It is a locally common, gregarious grazer.

<span class="mw-page-title-main">Black wallaroo</span> Species of marsupial

The black wallaroo, also known as Woodward's wallaroo, is a species of macropod restricted to a small, mountainous area in Arnhem Land, Northern Territory, Australia, between South Alligator River and Nabarlek. It classified as near threatened, mostly due to its limited distribution. A large proportion of the range is protected by Kakadu National Park.

<span class="mw-page-title-main">Northern nail-tail wallaby</span> Species of marsupial

The northern or sandy nail-tail wallaby is a species of macropod found across northern Australia on arid and sparsely wooded plains. The largest species of the genus Onychogalea, it is a solitary and nocturnal herbivorous browser that selects its food from a wide variety of grasses and succulent plant material. Distinguished by a slender and long-limbed form that resembles the typical and well known kangaroos, although their standing height is shorter, around half of one metre, and their weight is less than nine kilograms. As with some medium to large kangaroo species, such as Osphranter rufus, they have an unusual pentapedal motion at slow speeds by stiffening the tail for a fifth limb. When fleeing a disturbance, they hop rapidly with the tail curled back and repeatedly utter the sound "wuluhwuluh". Their exceptionally long tail has a broad fingernail-like protuberance beneath a dark crest of hair at its end, a peculiarity of the genus that is much broader than the other species. The name unguifera, meaning claw, is a reference to this extraordinary attribute, the purpose of which is unknown.

<span class="mw-page-title-main">Red-legged pademelon</span> Species of marsupial

The red-legged pademelon is a species of small macropod found on the northeastern coast of Australia and in New Guinea. In Australia it has a scattered distribution from the tip of Cape York Peninsula in Queensland to around Tamworth in New South Wales. In New Guinea it is found in south central lowlands.

<span class="mw-page-title-main">Macropod hybrid</span>

Macropod hybrids are hybrids of animals within the family Macropodidae, which includes kangaroos and wallabies. Several macropod hybrids have been experimentally bred, including:

<span class="mw-page-title-main">Macropodinae</span> Subfamily of marsupials

Macropodinae is a subfamily of marsupials in the family Macropodidae, which includes the kangaroos, wallabies, and related species. The subfamily includes about ten genera and at least 51 species. It includes all living members of the Macropodidae except for the banded hare-wallaby, the only surviving member of the subfamily Lagostrophinae.

References

  1. Menkhorst, P.; Denny, M.; Ellis, M.; Winter, J.; Burnett, S.; Lunney, D.; van Weenen, J. (2016). "Wallabia bicolor". IUCN Red List of Threatened Species . 2016: e.T40575A21952658. doi: 10.2305/IUCN.UK.2016-2.RLTS.T40575A21952658.en . Retrieved 12 November 2021.
  2. Trouessart, E.-L. (1904). Catalogus mammalium tam viventium quam fossilium. Vol. Quinquennale supplementum. Berolini: R. Friedländer & Sohn. p. 834.
  3. 1 2 3 4 Merchant, J. C. (1995). Strahan, Ronald (ed.). Mammals of Australia (Revised ed.). Sydney: Reed New Holland Publishers. p. 409.
  4. 1 2 3 4 5 6 7 8 Merchant, J. C. (1983). Strahan, Ronald (ed.). The Australian Museum Complete Book of Australian Mammals, The National Photographic Index of Australian Wildlife (Corrected 1991 reprint ed.). Australia: Cornstalk Publishing. pp. 261–262. ISBN   0-207-14454-0.
  5. "Dharug and Dharawal Resources".
  6. "Carpals of Swamp Wallaby – Wallabia bicolor". 3 July 2014.
  7. "Swamp wallabies conceive new embryo before birth -- a unique reproductive strategy". ScienceDaily. Retrieved 2020-03-03.
  8. Toder, R; O'Neill, R J; Wienberg, K; O'Brien, P C; Voullaire, L; Marshall-Graves, J A (June 1997). "Comparative chromosome painting between two marsupials: origins of an XX/XY1Y2 sex chromosome system". Mamm Genome. 8 (6): 418–22. doi:10.1007/s003359900459. PMID   9166586. S2CID   12515691 . Retrieved March 1, 2022.
  9. Fitzsimons, James A. (2016). "Carrion consumption by the swamp wallaby (Wallabia bicolor)". Australian Mammalogy. 39: 105. doi:10.1071/AM16017.
  10. Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 70. ISBN   0-801-88221-4. OCLC   62265494.
  11. Osawa, R (1989). "Road-Kills of the Swamp Wallaby, Wallabia-Bicolor, on North-Stradbroke-Island, Southeast Queensland". Wildlife Research. 16 (1): 95. doi:10.1071/WR9890095. ISSN   1035-3712.
  12. Davis, Naomi E.; Forsyth, David M.; Triggs, Barbara; Pascoe, Charlie; Benshemesh, Joe; Robley, Alan; Lawrence, Jenny; Ritchie, Euan G.; Nimmo, Dale G.; Lumsden, Lindy F. (2015-03-19). Crowther, Mathew S. (ed.). "Interspecific and Geographic Variation in the Diets of Sympatric Carnivores: Dingoes/Wild Dogs and Red Foxes in South-Eastern Australia". PLOS ONE. 10 (3): e0120975. Bibcode:2015PLoSO..1020975D. doi: 10.1371/journal.pone.0120975 . ISSN   1932-6203. PMC   4366095 . PMID   25790230.