Myosorex varius

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Myosorex varius
Myosorex varius.png
Drawing of M. varius
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Eulipotyphla
Family: Soricidae
Genus: Myosorex
Species:
M. varius
Binomial name
Myosorex varius
(Smuts, 1832)
Forest Shrew area.png
Forest shrew range

The forest shrew (Myosorex varius) is a species of shrew in the mouse shrew family, Soricidae. [2] It is found in Lesotho, South Africa, and Eswatini. [1] Its natural habitats include temperate forests, dry savanna, Mediterranean-type shrubby vegetation, and temperate grassland. [1] The term "forest shrews" in the plural is sometimes confusingly used to collectively refer to a different genus, Sylvisorex .

Contents

Description

The forest shrew grows to a length around 12.5 cm (5 in) with a tail of 4.3 cm (1.7 in) and an average mass of about 12 g (0.4 oz). In KwaZulu-Natal and the Drakensberg region, the males are larger than the females, but in the Cape Colony, the sexes are of similar sizes. This shrew is covered in short, dense fur, dark grey or brown above and paler underneath. [3]

Distribution and habitat

The forest shrew is native to South Africa, Lesotho, and Eswatini. In upland areas, it is often the commonest small mammal, but it is less common in coastal areas. It is found in a wide range of primary and secondary habitats, including forests, grassland, scrub, semidesert, karoo, and fynbos. [1]

Biology

The forest shrew excavates a shallow burrow or takes over the burrow of another small mammal. The complex of passages has several entrances and a nesting chamber containing dry grasses. These shrews are territorial and a breeding pair of shrews is often found in a nest. [3]

The forest shrew is mainly nocturnal and is an insectivore, but its diet also includes any small invertebrates it can find, including earthworms, millipedes, centipedes, crustaceans, and spiders. The forest shrew is preyed upon by barn owls, marsh mongooses, striped weasels, and striped polecats. To avoid predation, it spends most of its time in its burrow and only leaves when it needs to feed or defecate. Its droppings are very pungent. [3]

The breeding season varies across the forest shrew's range. In some areas, breeding takes place all year round, but in others, it is correlated with the higher rainfall which occurs in the summer, while unusually wet weather at other times of year can spark further reproductive activity. [4]

The forest shrew often contains the brachylaimid trematode Renylaima capensis in its kidney and ureter. This parasitic fluke has been found to have a three-host lifecycle, the first intermediate host being the terrestrial slug Ariostralis nebulosa and the second, another slug Ariopelta capensis . The forest shrew feeds on both these slugs. [5]

Feeding as it does on small invertebrates, the forest shrew tends to accumulate any environmental contaminants in its tissues. Earthworms are known to bioaccumulate lead and the levels of lead in forest shrews are found to rise when they eat contaminated earthworms. This enables the shrews to be used as bioindicators of heavy metal pollution. [6]

Status

The IUCN lists the forest shrew as being of "Least Concern" because it has a wide distribution and is common over much of its range and the population seems stable. It is able to adapt to variations in its habitat and no specific threats have been identified. [1]

Related Research Articles

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Hottentot golden mole Species of mammal

The Hottentot golden mole is a species of mammal in the golden mole family, Chrysochloridae. It is found in South Africa, Eswatini, and possibly Lesotho. Its natural habitats are temperate forests, subtropical or tropical dry forest, subtropical or tropical moist lowland forest, dry savanna, moist savanna, subtropical or tropical dry shrubland, Mediterranean-type shrubby vegetation, temperate grassland, subtropical or tropical dry lowland grassland, subtropical or tropical high-altitude grassland, sandy shores, arable land, pastureland, plantations, rural gardens, urban areas, and introduced vegetation.

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Reddish-gray musk shrew Species of mammal

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Greater red musk shrew Species of mammal

The greater red musk shrew is a species of mammal in the family Soricidae. It is found in Lesotho, Mozambique, South Africa, and Eswatini. Its natural habitats are moist savanna, temperate grassland, and rural gardens. Like most shrew species, C. flavenscens is nocturnal. The greater red musk shrew is considered to be asocial and territorial, with males using scent marking to establish their territory. Males appear to be more aggressive than females, and their aggression increases with greater population density.

<i>Myosorex</i> Genus of mammals

Myosorex is a mammal genus in the Soricidae (shrew) family. The genus, collectively referred to as the mouse shrews, contains these species:

Dark-footed mouse shrew Species of mammal

The dark-footed mouse shrew is a species of mammal in the family Soricidae found in Mozambique, South Africa, Eswatini, and Zimbabwe. Its natural habitat is subtropical or tropical moist montane forests. It is threatened by habitat loss. It was formerly sometimes called the dark-footed forest shrew.

Long-tailed forest shrew Species of mammal

The long-tailed forest shrew, or long-tailed mouse shrew, is a species of mammal in the family Soricidae. It is endemic to South Africa, where its natural habitats are Mediterranean-type shrubby vegetation and swamps.

Least dwarf shrew Species of mammal

The least dwarf shrew is a species of mammal in the family Soricidae. It is found in Cameroon, Central African Republic, Democratic Republic of the Congo, Kenya, Nigeria, South Africa, Eswatini, Tanzania, and Uganda. Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist montane forest, temperate grassland, subtropical or tropical dry lowland grassland, subtropical or tropical high-altitude grassland, and arable land.

<i>Ariostralis nebulosa</i> Species of gastropod

Ariostralis nebulosa is a species of air-breathing land slug, a terrestrial, pulmonate, gastropod mollusk in the family Oopeltidae.

References

  1. 1 2 3 4 5 "The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species . Retrieved 2018-10-28.
  2. Hutterer, R. (2005). "Order Soricomorpha". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. p. 266. ISBN   978-0-8018-8221-0. OCLC   62265494.
  3. 1 2 3 Joseph, Jency (2011). "Myosorex varius: forest shrew". Animal Diversity Web. Retrieved 23 February 2014.
  4. Merritt, Joseph F. (ed.); Baxter, Rod M. (2005). Advances in the Biology of Shrews II: Variation in aspects of the population dynamics of the endemic forest shrew Myosorex varius in South Africa. Lulu.com. pp. 179–187. ISBN   9781411678187.CS1 maint: extra text: authors list (link)
  5. Sirgel, W. F.; Artigas, P.; Bargues, M. D.; Mas-Coma, S. (2012). "Life Cycle of Renylaima capensis, a Brachylaimid Trematode of Shrews and Slugs in South Africa: Two-host and Three-host Transmission Modalities Suggested by Epizootiology and DNA Sequencing". Parasites & Vectors 5: 169. doi : 10.1186/1756-3305-5-169.
  6. Reinecke, A. J.; Reinecke, S. A.; Musilbono, D. E.; Chapman, A. (2000). "The Transfer of Lead (Pb) from Earthworms to Shrews (Myosorex varius)". Archives of Environmental Contamination and Toxicology. 39 (3): 392–397. doi:10.1007/s002440010120. PMID   10948291. S2CID   31190285.