Current distribution of the dusky hopping mouse (Notomys fuscus), Image: IUCN Red List.
The dusky hopping mouse (Notomys fuscus), is a small rodentendemic 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]
Taxonomy
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
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]
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]
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
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]
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
The total remaining population is estimated to be between 2,500 and 10,000 individuals.[2][14]
International Union for the Conservation of Nature (IUCN) Red List: Vulnerable[22]
Australia: Vulnerable (Environment Protection and Biodiversity Conservation Act 1999)[2][19]
New South Wales: Endangered (Biodiversity Conservation Act 2016 No 63)[38]
South Australia: Vulnerable (National Parks and Wildlife Act 1972)[39]
^ abSouth Australian Arid Lands Natural Resources Management Board (16 June 2021). Biodiversity Studies. Wikinti (Dusky Hopping Mouse) and Ooarri (Fawn Hopping Mouse) Student Fact Sheet. South Australia: South Australian Arid Lands Natural Resources Management Board. pp. 1–2.
^ abcdeBreed, B. and Ford, F. (2007). Native Mice and Rats. Collingwood, Victoria: CSIRO Publishing. pp. 3–5.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Jackson, S. and Groves, C. (2015). Taxonomy of Australian Mammals. Clayton South, Victoria: CSIRO Publishing. pp. 199–200.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Dickman, C R., and Robin, L. (2014). "Putting science in its place: the role of Sandringham Station in fostering arid zone science in Australia". Historical Records of Australian Science. 25 (2): 186–201. doi:10.1071/HR14014.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcdefghijMenkhorst, P. and Knight, F. (2011). A Field Guide to the Mammals of Australia, Third Edition. South Melbourne, Victoria: Oxford University Press. pp. 184–185.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ abcdeWatts, C. H. S., and Kemper, C. M. (1987). "Muridae". In D. W. Walton and G. R. Dyne (ed.). Fauna of Australia. Volume 1B. Mammalia. Victoria: CSIRO Publishing.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ abWatts, C. H. S. (1975). "The neck and chest glands of the Australian hopping-mice, Notomys". Australian Journal of Zoology. 23 (2): 151–157. doi:10.1071/ZO9750151.
^ abcdBreed, B. (2014). "Australia's other mammals: The mice and rats". Wildlife Australia. 51 (2): 10–14.
^Morrissey, B. L., and Breed, W. G. (1982). "Variation in external morphology of the glans penis of Australian native rodents". Australian Journal of Zoology. 30 (4): 495–502. doi:10.1071/ZO9820495.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Breed, W. G. (1986). "Comparative morphology and evolution of the male reproductive tract in the Australian hydromyine rodents (Muridae)". Journal of Zoology. 209 (4): 607–629. doi:10.1111/j.1469-7998.1986.tb03615.x.
^ abBreed, W. G., Ding, X., Tuke, J., and Leigh, C. M. (2020). "Morphological diversity of the spermatozoon and male reproductive tract in Australian Hopping mice, genus Notomys–is it determined by sexual selection?". Journal of Zoology. 311 (3): 194–203. doi:10.1111/jzo.12779. S2CID216251471.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcdefghijklmnoMoseby, K. E., Brandle, R., and Adams, M. (1999). "Distribution, habitat and conservation status of the rare dusky hopping-mouse, Notomys fuscus (Rodentia: Muridae)". Wildlife Research. 26 (4): 479–494. doi:10.1071/WR97061.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcRobinson, A. C., Kemper, C. M., Medlin, G. C. and Watts, C. H. S. (2000). "The rodents of South Australia". Wildlife Research. 27 (4): 379–404. doi:10.1071/WR97044.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Cole, J. R. and Woinarski, J. C. Z. (2000). "Rodents of the arid Northern Territory: conservation status and distribution". Wildlife Research. 27 (4): 437–449. doi:10.1071/WR97053.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcdefgOffice of Environment and Heritage (2017). "Dusky Hopping-mouse – profile". Office of Environment and Heritage. Archived from the original on 2015-06-27. Retrieved 16 June 2021.
^ abVal, J., Mazzer, T., and Shelly, D. (2012). "A new record of the dusky hopping mouse (Notomys fuscus) in New South Wales". Australian Mammalogy. 34 (2): 257–259. doi:10.1071/AM11031.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcdMorris, T., Gordon, C. E., & Letnic, M. (2015). "Divergent foraging behaviour of a desert rodent, Notomys fuscus, in covered and open microhabitats revealed using giving up densities and video analysis". Australian Mammalogy. 37 (1): 46–50. doi:10.1071/AM14030.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abMurray, B. R., Dickman, C. R., Watts, C. H. S., & Morton, S. R. (1999). "The dietary ecology of Australian desert rodents". Wildlife Research. 26 (4): 421–437. doi:10.1071/WR97046.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcAslin, H. J. and Watts, C. H. S. (1980). "Breeding of a captive colony of Notomys fuscus Wood Jones (Rodentia: Muridae)". Australian Wildlife Research. 7 (3): 379–383. doi:10.1071/WR9800379.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcdefMoseby, K. E., Owens, H., Brandle, R., Bice, J. K., and Gates, J. (2006). "Variation in population dynamics and movement patterns between two geographically isolated populations of the dusky hopping mouse (Notomys fuscus)". Wildlife Research. 33 (3): 223–232. doi:10.1071/WR05034.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Waudby, H. P., and How, T. (2008). "An additional record of the dusky hopping mouse Notomys fuscus in South Australia". Australian Mammalogy. 30 (1): 47–50. doi:10.1071/AM08006.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Letnic, M., & Koch, F. (2010). "Are dingoes a trophic regulator in arid Australia? A comparison of mammal communities on either side of the dingo fence". Austral Ecology. 35 (2): 167–175. Bibcode:2010AusEc..35..167L. doi:10.1111/j.1442-9993.2009.02022.x.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^McDowell, M. C., and Medlin, G. C. (2009). "The effects of drought on prey selection of the barn owl (Tyto alba) in the Strzelecki Regional Reserve, north-eastern South Australia". Australian Mammalogy. 31 (1): 47–55. doi:10.1071/AM08115.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^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. S2CID202861177.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^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. PMID26852773. S2CID3738625.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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