Hazel dormouse

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Hazel dormouse
Temporal range: Early Pleistocene–Recent
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Haselmaus.jpg
Status iucn3.1 VU.svg
Vulnerable  (IUCN 3.1) [2] (Great Britain)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Gliridae
Subfamily: Leithiinae
Genus: Muscardinus
Kaup, 1829
Species:
M. avellanarius
Binomial name
Muscardinus avellanarius
Muscardinus avellanarius distribution.svg
Geographic range
Synonyms

Mus avellanariusLinnaeus, 1758

The hazel dormouse or common dormouse (Muscardinus avellanarius) is a small dormouse species native to Europe and the only living species in the genus Muscardinus. [3]

Contents

Distribution and habitat

The hazel dormouse is native to northern Europe and Asia Minor. It is the only dormouse native to the British Isles, and is therefore often referred to simply as the "dormouse" in British sources, although the edible dormouse, Glis glis, has been accidentally introduced and now has an established population in South East England. Though Ireland has no native dormouse, the hazel dormouse was discovered in County Kildare in 2010, [4] [5] and appears to be spreading rapidly, helped by the prevalence of hedgerows in the Irish countryside. [6]

The United Kingdom distribution of the hazel dormouse can be found on the National Biodiversity Network website. A 2020 study found that hazel dormice in Britain have declined by 51% since 2000. Woodland habitat loss and management and a warming climate are seen as material threats to their future status. [7]

Habitat

According to English Nature's Dormouse Conservation Handbook, hazel dormice are "particularly associated with deciduous woodland" but also inhabit hedgerows and scrub. [8]

Dormice seldom travel more than 70 m from their nest. [8]

Description

Hazel dormouse on Epilobium Gliridae - Muscardinus avellanarius (Dormouse)-001.JPG
Hazel dormouse on Epilobium

The hazel dormouse can reach a body length of about 10 centimetres (3.9 in) and a length of about 16 centimetres (6.3 in) if you consider the tail as well. It is 6 to 9 cm (2.4 to 3.5 in) long with a tail of 5.7 to 7.5 cm (2.2 to 3.0 in). It weighs 17 to 20 g (0.60 to 0.71 oz), although this increases to 30 to 40 grams (1.1 to 1.4 oz) just before hibernation. This small mammal has reddish brown fur that can vary up to golden-brown or yellow-orange-brown becoming lighter in the lower part. Eyes are large and black. Ears are small and not very developed, while the tail is long and completely covered with hair.

It is a nocturnal creature and spends most of its waking hours among the branches of trees looking for food. It will make long detours rather than come down to the ground and expose itself to danger. The hazel dormouse hibernates from October to April–May.

Behaviour

Starting from the onset of colder weather (October or November), the hazel dormouse will hibernate in nests on the ground, at the base of old coppiced trees or hazel stools, under piles of leaves, or under log piles, as these situations are not subject to extreme variations in either temperature or humidity. Dormice are almost completely arboreal in habit but much less reluctant to cross open ground than was thought even recently. When it wakes up in spring (late April or early May), it builds woven nests of shredded honeysuckle bark, fresh leaves, and grasses in the undergrowth. If the weather is cold and wet and food is scarce, it saves energy by going into torpor; it curls up into a ball and goes to sleep. The hazel dormouse, therefore, spends a large proportion of its life sleeping, either hibernating in winter or in torpor in summer.

M. avellanarius moving a newborn baby Muscardinus avellanarius con piccolo 2.jpg
M. avellanarius moving a newborn baby

An examination of hazelnuts may show a neat, round hole in the shell. This indicates it has been opened by a small rodent, e.g. the dormouse, wood mouse, or bank vole. Other animals, such as squirrels or jays, will either split the shell completely in half or make a jagged hole in it.

Further examination reveals the cut surface of the hole has toothmarks which follow the direction of the shell. In addition, there will be toothmarks on the outer surface of the nut, at an angle of about 45 degrees to the cut surface. Woodmice and voles bite across the nutshell leaving clear parallel toothmarks from inside to outside. Woodmice also leave toothmarks on the outer surface of the nut but voles do not.

A hibernating hazel dormouse. Dormouse1.jpg
A hibernating hazel dormouse.

Diet

The hazel dormouse requires a variety of arboreal foods to survive. It eats berries and nuts and other fruit with hazelnuts being the main food for fattening up before hibernation. The dormouse also eats hornbeam and blackthorn fruit where hazel is scarce. Other food sources are the buds of young leaves, and flowers which provide nectar and pollen. The dormouse also eats insects found on food-source trees, particularly aphids and caterpillars.

Plants of value to dormice

Threats

Protection status

The hazel dormouse is protected by and in UK under the Wildlife and Countryside Act. [17]

Evolutionary history

The oldest fossils of the genus Muscardinus date to the Serravallian stage of the Middle Miocene approximately 13.8 to 11.6 million years ago in what is now Spain. The oldest fossils of the modern species date to the Early Pleistocene. [18]

Related Research Articles

<span class="mw-page-title-main">Dormouse</span> Family of rodents

A dormouse is a rodent of the family Gliridae. Dormice are nocturnal animals found in Africa, Asia, and Europe. They are named for their long, dormant hibernation period of six months or longer.

<span class="mw-page-title-main">European edible dormouse</span> Species of rodent

The Europeanedible dormouse or European fat dormouse is a large dormouse and one of only two living species in the genus Glis, found in most of Europe and parts of western Asia. The common name comes from the Romans, who ate them as a delicacy.

<span class="mw-page-title-main">Short-tailed field vole</span> Species of rodent

The short-tailed field vole, short-tailed vole, or simply field vole is a grey-brown vole, around 10 cm in length, with a short tail. It is one of the most common mammals in Europe, with a range extending from the Atlantic coast to Lake Baikal. These voles are found in moist grassy habitats, such as woodland, marsh or on river banks. Although they make shallow burrows, they usually build nests above ground. They are an important food source for owls and some other predators and their population size tends to peak and trough cyclically. Field voles breed prolifically, mainly in summer, but often all year round, even under snow. Females produce up to seven litters a year, each averaging from four to six young which are weaned after about fourteen days. The short-tailed field vole is both widespread and common and is listed as being of "Least Concern" by the IUCN.

<span class="mw-page-title-main">Bank vole</span> Species of rodent

The bank vole is a small vole with red-brown fur and some grey patches, with a tail about half as long as its body. A rodent, it lives in woodland areas and is around 100 millimetres (3.9 in) in length. The bank vole is found in much of Europe and in northwestern Asia. It is native to Great Britain but not to Ireland, where it has been accidentally introduced, and has now colonised much of the south and southwest.

<span class="mw-page-title-main">Garden dormouse</span> Species of rodent

The garden dormouse is a species of dormouse native to Europe.

<span class="mw-page-title-main">Japanese dormouse</span> Species of rodent

The Japanese dormouse is a species of rodent in the family Gliridae endemic to Japan. It is the only extant species within the genus Glirulus. Its natural habitat is temperate forests. In Japanese, it is called yamane. Among dormice, it has the special ability of running at great speed upside down, suspended from branches. Its main food is fruit, insects, berries, nuts, and even flowers. It tends to inhabit arboreal nesting sites to avoid interspecific competition with the small Japanese field mouse because of their sympatric relationship.

<span class="mw-page-title-main">Woodland dormouse</span> Species of rodent

The woodland dormouse is a species of rodent in the family Gliridae. It is native to southern and eastern Africa and is also known as the African dormouse, African dwarf dormouse, African pygmy dormouse, or colloquially as micro squirrel. Found in limited numbers in the pet trade, it has complicated care requirements compared to other pet rodents. Its natural habitats are subtropical or tropical, moist montane forests and rivers.

<span class="mw-page-title-main">Leithiinae</span> Subfamily of rodents

Leithiinae is a subfamily of dormice. It is named after the Leithia, an extinct genus of giant dormouse from the Pleistocene of Sicily.

<span class="mw-page-title-main">Forest dormouse</span> Species of rodent

The forest dormouse is a species of rodent in the family Gliridae found in eastern Europe, the Balkans and parts of western Central Asia. It is categorized as being of least concern in the IUCN List of Threatened Species due to its wide range and stable population trend. Forest dormice have a diploid count (2n) of 48 chromosomes. Even though this species lives in a variety of geographic locations, its greatest population density is in the forests of central Moldova, in Transcaucasia, and in the mountains of Central Asia. In most other locations, population density of this species is rather low. Population density is dependent on many factors. But the main features that this species depends on for choosing a location are the presence of the appropriate food sources as well as good foliage that can be used for a habitat. The reason why the forests in central Moldova have the highest population density is they provide the largest diversity of food sources which are available throughout the year. This location also provides the best type of foliage for the forest dormice to build their nests as well as swing from branches. The combination of both of these aspects allows for this species to have its highest needs met. Therefore, during mating season they produce offspring who also stay in the same general area when they mature. It makes sense not to move from an area if it is providing for your most basic needs.

<span class="mw-page-title-main">People's Trust for Endangered Species</span>

Peoples Trust for Endangered Species (PTES) is a charitable organisation registered in England and Wales. It exists to promote the conservation of rare or declining species and habitats in the UK and worldwide through monitoring, public engagement, education, and through the funding of conservation projects and research. It also owns and manages two nature reserves. As of April 2015, PTES has 16 employees, five trustees and coordinates around 24,000 volunteers in the UK. PTES relies on donations from the general public and grants from trusts and foundations to continue its work - it receives no core funding from the UK Government. The organisation has registered charity number 274206.

Briddlesford Nature Reserve consists of 158 hectares of land on the Isle of Wight that is composed of a complex of different habitats, including woodland, arable farmland, lowland meadow, parkland, pond, hedgerow and grazing marsh. The reserve encompasses a majority of the Briddlesford Copses Site of Special Scientific Interest (SSSI) and Special Area of Conservation (SAC) together with about 50 hectares of farmland. The reserve is owned by People's Trust for Endangered Species (PTES) and managed to preserve and enhance its biodiversity value.

References

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  2. "Population Review Red List". The Mammal Society. Retrieved 28 June 2020.
  3. Mitchell-Jones, A. J.; Amori, G.; Bogdanowicz, W.; Kryštufek, B.; Reijnders, P.J.H.; Spitzenberger, F.; Stubbe, M.; Thissen, J.B.M.; Vohralik, V. & Zima, J. (1999). The atlas of European Mammals. London: Academic Press. p. 484.
  4. Marnell, Ferdia; Donoher, Daniel; Sheehy, Emma; Lawton, Colin (2013). "First confirmed record of Hazel Dormouse (Muscardinus avellanarius) in the wild in Ireland". Irish Naturalists' Journal. 33 (1): 77–78 via ResearchGate.
  5. Ahlstrom, Dick (16 July 2013). "The dormouse makes first appearance in Ireland". Irish Times.
  6. Mooney, John (8 September 2013). "Rare UK dormouse moved to Ireland". Sunday Times.
  7. 1 2 Vinter, Robyn (18 April 2020). "Hedgerow highway will keep dormice thriving in the Yorkshire Dales". The Guardian. London, UK. Retrieved 18 April 2020.
  8. 1 2 3 Paul Bright, Pat Morris & Tony Mitchell-Jones, The Dormouse Conservation Handbook (2nd ed.: English Nature, 2006), p. 13.
  9. Juškaitis, Rimvydas; Baltrunaite, Laima (2013). "Feeding on the edge: the diet of the hazel dormouse Muscardinus avellanarius (Linnaeus 1758) on the northern periphery of its distributional range". Mammalia. 77 (2): 149–155. doi:10.1515/mammalia-2012-0086. S2CID   84754901 . Retrieved 28 June 2020.
  10. Hedgerows for Dormice Archived 28 November 2009 at the Wayback Machine . Ptes.org. Retrieved on 28 December 2012.
  11. Trust, Woodland. "Hazel Dormouse (Muscardinus avellanarius)". Woodland Trust. Retrieved 3 February 2023.
  12. 1 2 Verbeylen, Goedele. "How small should the entrance be? Is it possible to let common dormice Muscardinus avellanarius enter nest boxes and exclude other species." (2017): 35-39.
  13. Moffat, Ruth (2017). THE STATUS OF THE HAZEL DORMOUSE(Muscardinus avellanarius) IN WARWICKSHIRE, COVENTRY & SOLIHULL IN 2016 (PDF). Warwickshire Dormouse Conservation Group. p. 6.
  14. "New report reveals Britain's hazel dormice decline". National Biodiversity Network Trust. 20 November 2019. Retrieved 8 November 2021.
  15. Maclean, Norman (20 May 2010). Silent Summer: The State of Wildlife in Britain and Ireland. Cambridge University Press. ISBN   978-0-521-51966-3.
  16. "The State of Britain's Dormice 2019" (PDF). People’s Trust for Endangered Species. Retrieved 8 November 2021.
  17. Dormouse: European protected species. Natural England Species Information Note SIN005 (19 October 2007)
  18. Garcia-Ibaibarriaga, Naroa; Arrizabalaga, Álvaro; Iriarte-Chiapusso, María-José; Rofes, Juan; Murelaga, Xabier (July 2015). "The return to the Iberian Peninsula: first Quaternary record of Muscardinus and a palaeogeographical overview of the genus in Europe". Quaternary Science Reviews. 119: 106–115. doi:10.1016/j.quascirev.2015.04.017.