Japanese squirrel
Species of mammal
| Japanese squirrel | |
|---|---|
 | |
Conservation status | |
 Least Concern (IUCN 3.1)[1] | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Rodentia |
| Family: | Sciuridae |
| Genus: | Sciurus |
| Species: | S. lis |
| Binomial name | |
| Sciurus lis Temminck, 1844[2] | |
 | |
| Japanese squirrel's range | |
The Japanese squirrel (Sciurus lis) is a tree squirrel in the genus Sciurus endemic to Japan. It was described by Dutch zoologist Coenraad Jacob Temminck in 1844. The Japanese squirrel's native range includes large portions of the islands of Honshū, Shikoku, and Kyūshū. The Japanese squirrel is absent from Hokkaido, where it is replaced by the related red squirrel (Sciurus vulgaris), which is conversely absent from the rest of the Japanese archipelago outside Hokkaido. Recently, populations in south-western Honshū and Shikoku decreased, and those on Kyūshū disappeared. One of the factors affecting the recent local extirpations of this species seems to be forest fragmentation by humans.
In certain areas, up to 35% of its diet can come from walnuts. It is possible the resulting dispersion has affected the evolution of larger seed sizes among Japanese walnut populations where Japanese squirrels are present.[3][4] Furthermore, Japanese walnut (Juglans ailanthifolia) is an important food for Japanese squirrels in lowland mixed-species forests in Japan. The Japanese squirrel's feeding technique consists of opening the hard shell of walnuts by chewing along the crease of the shell, embedding its teeth into the cleft, and airing out the two parts. This strategy seems to be efficient since it minimizes the time to finish eating an entire walnut.[3]
References
- ^ Ishii, N. & Kaneko, Y. (2008). "Sciurus lis". IUCN Red List of Threatened Species. 2008. Retrieved 6 January 2009.{{cite iucn}}: old-form url (help)
- ^ Thorington, R.W. Jr.; Hoffmann, R.S. (2005). "Sciurus (Sciurus) lis". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: a taxonomic and geographic reference (3rd ed.). The Johns Hopkins University Press. pp. 754–818. ISBN 0-8018-8221-4. OCLC 26158608.
- ^ a b Tamura, Noriko. “Population Differences and Learning Effects in Walnut Feeding Technique by the Japanese Squirrel.” Journal of Ethology 29.2 (2011): 351–363. Web.
- ^ Tamura, N. and Hayashi, F. (2008), Geographic variation in walnut seed size correlates with hoarding behaviour of two rodent species. Ecol. Res., 23: 607–614. doi:10.1007/s11284-007-0414-8
External links
Media related to Sciurus lis at Wikimedia Commons
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- Kingdom: Animalia
- Phylum: Chordata
- Class: Mammalia
- Order: Rodentia
- Suborder: Sciuromorpha
(Dwarf squirrels)
- Central American dwarf squirrel (Microsciurus alfari)
- Amazon dwarf squirrel (Microsciurus flaviventer)
- Western dwarf squirrel (Microsciurus mimulus)
- Santander dwarf squirrel (Microsciurus santanderensis)
- Tufted ground squirrel (Rheithrosciurus macrotis)
- Subgenus Guerlinguetus
- Brazilian squirrel (Sciurus aestuans)
- South Yungas red squirrel (Sciurus argentinius)
- Yellow-throated squirrel (Sciurus gilvigularis)
- Red-tailed squirrel (Sciurus granatensis)
- Bolivian squirrel (Sciurus ignitus)
- Atlantic Forest squirrel (Sciurus ingrami)
- Andean squirrel (Sciurus pucheranii)
- Richmond's squirrel (Sciurus richmondi)
- Sanborn's squirrel (Sciurus sanborni)
- Guayaquil squirrel (Sciurus stramineus)
- Subgenus Hadrosciurus
- Fiery squirrel (Sciurus flammifer)
- Junín red squirrel (Sciurus pyrrhinus)
- Subgenus Hesperosciurus
- Western gray squirrel (Sciurus griseus)
- Subgenus Otosciurus
- Abert's squirrel (Sciurus aberti)
- Subgenus Sciurus
- Allen's squirrel (Sciurus alleni)
- Arizona gray squirrel (Sciurus arizonensis)
- Mexican gray squirrel (Sciurus aureogaster)
- Eastern gray squirrel (Sciurus carolinensis)
- Collie's squirrel (Sciurus colliaei)
- Deppe's squirrel (Sciurus deppei)
- Japanese squirrel (Sciurus lis)
- Calabrian black squirrel (Sciurus meridionalis)
- Mexican fox squirrel (Sciurus nayaritensis)
- Fox squirrel (Sciurus niger)
- Peters's squirrel (Sciurus oculatus)
- Variegated squirrel (Sciurus variegatoides)
- Red squirrel (Sciurus vulgaris)
- Yucatan squirrel (Sciurus yucatanensis)
- Subgenus Tenes
- Caucasian squirrel (Sciurus anomalus)
- Subgenus Urosciurus
- Northern Amazon red squirrel (Sciurus igniventris)
- Southern Amazon red squirrel (Sciurus spadiceus)
- Bangs's mountain squirrel (Syntheosciurus brochus)
(Pine squirrels)
- Douglas squirrel (Tamiasciurus douglasii)
- Southwestern red squirrel (Tamiasciurus fremonti)
- American red squirrel (Tamiasciurus hudsonicus)
Category
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