Dusky hopping mouse

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Dusky hopping mouse
Dusky hopping mouse.jpg
Dusky hopping mouse (Notomys fuscus). Photo: Mike Letnic.
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Muridae
Genus: Notomys
Species:
N. fuscus
Binomial name
Notomys fuscus
Jones, 1925
Distribution map of Dusky Hopping Mouse (Notomys fuscus).jpg
Current distribution of the dusky hopping mouse (Notomys fuscus), Image: IUCN Red List.

The dusky hopping mouse (Notomys fuscus), is a small rodent endemic to Australia, inhabiting desert regions characterised by sand dunes. Populations have experienced significant declines since the arrival of Europeans, and continue to be subject to threatening processes. It is currently listed as a threatened species. [2]

Contents

Taxonomy

Adult dusky hopping mouse (Notomys fuscus). Photo: Katherine Moseby. Adult Dusky Hopping Mouse (Notomys fuscus).jpg
Adult dusky hopping mouse (Notomys fuscus). Photo: Katherine Moseby.

The dusky hopping mouse, or Wilkinti, [2] [3] is a mammal in the order Rodentia, and suborder Sciurognathi. The species is in the family Muridae and the subfamily Murinae (includes all Australian native rats and mice). The dusky hopping mouse belongs to the genus Notomys , a group of desert-dwelling rodents. [4]

The species was originally described as Ascopharynx fuscus (Wood Jones 1925) from a specimen collected in South Australia. Subsequent collections were described as Notomys fuscus eyreius in 1960. [5] Hopping mice collected in Queensland between 1957 and 1959 were described as a new species, Notomys filmeri, however, later taxonomic investigation revealed these were Notomys fuscus. [6]

Description

Specimen of dusky hopping mouse (Notomys fuscus), showing throat pouch. Image: Queensland Museum. Dusky Hopping Mouse (Notomys fuscus).jpg
Specimen of dusky hopping mouse (Notomys fuscus), showing throat pouch. Image: Queensland Museum.

The dusky hopping mouse has pale orange-brown upper parts, occasionally with grey tinged streaks. The under parts are grey-white. [7] It grows to 80–115 mm long, [7] with an average weight of 35 g. [4] [7] The tail is between 120 and 155 mm long, [7] ending in a tuft of dark hairs. [2] [8] They have a well-developed throat pouch, with an opening surrounded by a fleshy margin with inward pointing, coarse white hairs. [7] [9] Its ears are large and furless for dissipating heat, and they have prominent dark eyes, [2] [10] and strong incisor teeth. [8] [10] It has short front legs, and long, elongated hind feet. [2] [8] with only three pads on the sole. [7] Male reproductive anatomy is distinctive. [4] The glans is small and tapered towards the tip. The surface has large dorsally projecting spines, with slightly curved tips. [11] The testes are extremely small compared to other native rodents. [12] [13] Females have two pairs of inguinal teats. [7] [8]

Distribution

Sub-adult dusky hopping mouse (Notomys fuscus). Photo: Katherine Moseby. Sub-adult Dusky Hopping Mouse (Notomys fuscus)1.jpg
Sub-adult dusky hopping mouse (Notomys fuscus). Photo: Katherine Moseby.

The species historically inhabited large areas of central Australia, south-west Queensland, and far west South Australia, [14] and Western Australia. [15] Sub-fossil specimens were found in far-south South Australia, near the Flinders Ranges. [14] Populations were recorded in the Northern Territory, however have not been observed since 1939. [16] [17] It is highly likely to have occurred in western New South Wales. [18] Distribution has shown a marked decline of more than 90% since the arrival of Europeans, [14] with populations now patchy and highly fragmented. [2] [14] It is currently thought to be restricted to the Cobblers Sandhills and Strzelecki Desert in north-east South Australia, [14] [15] south-west Queensland and far north-west New South Wales. [7] [19] The species was presumed to be extinct in New South Wales, before being re-discovered in Sturt National Park in 2003. [18] [20] Since then, a number of sightings have been recorded near Broken Hill, New South Wales. [20] [21]

Ecology

Habitat

The Strzelecki Desert, contains habitats preferred by the dusky hopping mouse (Notomys fuscus). Photo: Mike Letnic. Strzelecki Desert.jpg
The Strzelecki Desert, contains habitats preferred by the dusky hopping mouse (Notomys fuscus). Photo: Mike Letnic.

The preferred habitat of the dusky hopping mouse is the crests and slopes of stabilised desert sand dunes and ridges, [15] [20] with sand required for digging burrows. [22] Dense populations tend to occur only within the vicinity of major drainage systems. [14] It does not appear to favour a particular vegetation type, occurring in dunes well-vegetated by canegrass (Zygochloa paradoxa), as well as degraded ecosystems dominated by ephemeral herbaceous species. [14] It has also been associated with perennial shrub species such as nitre bush (Nitraria billardierei) and Acacia species. [20]

Behaviour

The dusky hopping mouse is a social species, [7] living in colonies of up to five individuals. [20] [22] [2] They live in burrows consisting of vertical shafts with a series of entrances approximately 3 cm in diameter, [7] [2] leading to a network of horizontal tunnels and chambers [3] [4] extending up to 2m deep. [22] Notomys species dig their burrows from below, resulting in an absence of loose sand surrounding the entrance holes. [10] This species prefers to forage at night in sheltered microhabitats, rather than open areas, to avoid the risk of predation. [23] It is an opportunistic, [14] omnivorous feeder, however is considered a granivore (74% of the diet). [24] Green plant material, insects, [24] and fruits are also eaten. [14] It does not need to drink water. [2] [20] The neck throat pouch is a glandular area, used for marking territories. Females may scent-mark their young, ensuring they acquire a smell that grants them acceptance within the colony. [9]

Dusky hopping mouse (Notomys fuscus) tracks in the sand. Photo: Mike Letnic. Dusky hopping mouse track.jpg
Dusky hopping mouse (Notomys fuscus) tracks in the sand. Photo: Mike Letnic.

Life cycle and reproduction

In the wild, lifespan has been recorded as being up to 13 months of age. [22] In captivity, males and females reach reproductive maturity at 70 days of age. [25] This species is likely monogamous, and females may display selectivity in choosing which males will sire offspring. [10] [13] Breeding is non-seasonal, occurring year-round, in both wet and dry conditions. [14] [25] Females are observed to be polyoestrous, with a gestation period of 32 to 38 days, and a litter size of one to five offspring. An average of 42 days occurs between litters, and the maximum reproductive life for females is approximately 24 months, and males 36 months. [25] Subpopulations may persist at low but stable numbers, however others exhibit “boom-and-bust” variation, with numbers increasing and decreasing rapidly in response to rainfall and resource availability. [21] [22] [26] [27]

Dispersal and movement

When travelling slowly, hopping mice move on all fours, however they hop on the hind feet when travelling at speed. [4] [8] Individuals can disperse over large distances to colonise isolated habitats, crossing areas of hard unsuitable substrate. [22] Foraging distances are up to 400m per night, extending up to 1.5 km over three nights. [22] [26] Individuals inhabiting degraded habitats with limited vegetation and food resources show lower mobility, whereas those inhabiting highly diverse habitats with a wide variety of resources have wider ranging movement patterns. [26]

Threats

Predation

Feral cats (Felis catus) target small mammals as prey, such as native rodents. Photo: Megan Moppett. Feral cat (Felis catus).jpg
Feral cats (Felis catus) target small mammals as prey, such as native rodents. Photo: Megan Moppett.

Introduced predators such as the red fox (Vulpes vulpes) [28] and feral cat (Felis catus) have detrimental impacts on dusky hopping mouse populations. [23] [29] Where cat and fox abundance is high, dusky hopping mouse populations decline. [28] [29] [30] Cats target smaller prey such as rodents, which can make up a large proportion of their diet. [31] Native species, such as the barn owl ( Tyto alba ), frequently consume this species, [23] [32] as does the dingo. [23] [33] Dingoes may de-populate localised populations of hopping mice within months, [34] particularly under drought conditions. [33] Crest-tailed mulgara (Dasycercus cristicauda) have also been recorded eating this species. [35]

Habitat degradation

Livestock, kangaroos and rabbits overgraze vegetation required for shelter and food sources, [20] leading to scalding, wind and sheet erosion and a shift from perennial, to less productive ephemeral plant species. [14] [26] Livestock also damage habitats by trampling. [31] [36] Reduced food availability limits hopping mice abundance, and the availability of suitable habitat limits their distribution. [14] [26] However, higher annual rainfall and more productive ecosystems may buffer the effects of livestock, by providing more dependable and abundant resources, allowing mice to proliferate. [14] [33]

Sub-adult Dusky Hopping Mouse (Notomys fuscus). Photo: Katherine Moseby. Sub-adult Dusky Hopping Mouse (Notomys fuscus).jpg
Sub-adult Dusky Hopping Mouse (Notomys fuscus). Photo: Katherine Moseby.

Competition

Competition for food and habitat occurs with the house mouse (Mus musculus), [22] which increase in abundance more rapidly under favourable conditions, depleting resources and outcompeting the native mice. [14] The rabbit (Oryctolagus cuniculus) also competes with dusky hopping mice for food. Declines in rabbit abundance, and increased resources, following the release of the Rabbit Haemorrhagic Disease Virus (RHDV) in Australia in 1995, saw the dusky hopping mouse increased their extent of occurrence by 241 to 365% over 14 years. [37]

Climate Change

This species experiences natural population declines during dry periods, when food resources are limited, and increase strongly following rainfall events. [26] [33] Decreases in rainfall, less frequent rainfall events and more frequent droughts under climate change may cause declines or extinctions. [19] [22] Predation of hopping mice by dingoes intensifies under drought conditions, which may significantly impact populations. [33]

Conservation status

Dusky hopping mouse (Notomys fuscus) in the Strzelecki Desert. Photo: Sue Rodwell. Dusky Hopping Mouse.jpg
Dusky hopping mouse (Notomys fuscus) in the Strzelecki Desert. Photo: Sue Rodwell.

The total remaining population is estimated to be between 2,500 and 10,000 individuals. [2] [14]

Related Research Articles

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References

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  33. 1 2 3 4 5 Allen, B. L., Fawcett, A., Anker, A., Engeman, R. M., Lisle, A., and Leung, L. K. P (2018). "Environmental effects are stronger than human effects on mammalian predator-prey relationships in arid Australian ecosystems". Science of the Total Environment. 610: 451–461. Bibcode:2018ScTEn.610..451A. doi:10.1016/j.scitotenv.2017.08.051. PMID   28818660. S2CID   26955593.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  34. ↑ Allen, B. L., and Leung, L. K. P. (2012). "Assessing predation risk to threatened fauna from their prevalence in predator scats: dingoes and rodents in arid Australia". PLOS ONE. 7 (5): e36426. Bibcode:2012PLoSO...736426A. doi: 10.1371/journal.pone.0036426 . PMC   3341367 . PMID   22563498.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  35. ↑ Contos, P. and Letnic, M. (2020). "Diet of the crest-tailed mulgara (Dasycercus cristicauda) in the Strzelecki Desert". Australian Mammalogy. 42 (2): 211–215. doi:10.1071/AM19003. S2CID   202861177.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  36. ↑ Vernes, K., Elliott, T. F., & Jackson, S. M. (2021). "150 years of mammal extinction and invasion at Koonchera Dune in the Lake Eyre Basin of South Australia". Biological Invasions. 23 (2): 593–610. Bibcode:2021BiInv..23..593V. doi:10.1007/s10530-020-02387-2. S2CID   226344657.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  37. ↑ Pedler, R. D., Brandle, R., Read, J. L., Southgate, R., Bird, P., and Moseby, K. E. (2016). "Rabbit biocontrol and landscape-scale recovery of threatened desert mammals". Conservation Biology. 30 (4): 774–782. Bibcode:2016ConBi..30..774P. doi:10.1111/cobi.12684. PMID   26852773. S2CID   3738625.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  38. ↑ NSW Government (2016). "Biodiversity Conservation Act 2016 No 63". NSW Government. Archived from the original on 2021-06-13. Retrieved 16 June 2021.
  39. ↑ Government of South Australia. (2021). "South Australia National Parks and Wildlife Act 1972 (Version 19.3.2021)" (PDF). Government of South Australia. Archived (PDF) from the original on 2018-01-14. Retrieved 16 June 2021.
  40. ↑ Queensland Government (23 October 2019). "Species profile – Notomys fuscus (dusky hopping mouse)". Queensland Government. Archived from the original on 2021-03-15. Retrieved 16 June 2021.
  41. ↑ Queensland Government (2021). "Nature Conservation Act 1992". Queensland Government. Archived from the original on 2018-02-26. Retrieved 16 June 2021.
  42. ↑ Northern Territory Government. (2021). "Territory Parks and Wildlife Conservation Act 1976". Northern Territory Government. Archived from the original on 2020-04-14. Retrieved 16 June 2021.
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