Saint Lawrence red-toothed shrew
| Saint Lawrence red-toothed shrew | ||||||||||||
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| Sorex jacksoni | ||||||||||||
| Hall & Gilmore , 1932 |
The St. Lawrence Rotzahnspitzmaus ( Sorex jacksoni ) is a species of the genus Sorex . She is endemic on the US state of Alaska is part of St. Lawrence Island in the Bering Sea before.
features
The body length of the Saint Lawrence red-toothed shrew, including the tail, is 94 to 107 millimeters. Their weight is between four and five grams.
distribution
Its occurrence is limited to the St. Lawrence Island in the Bering Sea, which belongs to the US state of Alaska , it is accordingly endemic to this island and is the only shrew species to be found there. Because of its northern habitat, it is one of the few insectivores that belong to the fauna of the Arctic .
Way of life
The species' habitats include bogs and wet tundra areas, logging areas, and other open structures on the island. In some parts they can only be found in the falls or in rubble. It can also be found in places where voles and insects are numerous sources of food. In winter, the animals also invade storage rooms where dried or frozen meat is stored.
Systematics
The Saint Lawrence red- toothed shrew is classified as an independent species within the red- toothed shrew (genus Sorex ) and there in the subgenus Otisorex . The first scientific description comes from Eugene Raymond Hall & Raymond Maurice Gilmore from 1932. It was at times considered together with other arctic forms as a subspecies of the tundra red-toothed shrew ( Sorex tundrensis ) and later the American masked red-toothed shrew ( Sorex cinereus ). At times Sorex leucogaster , Sorex portenkoi and Sorex ugyunak were classified as subspecies of the Saint Lawrence red- toothed shrew , but today they are all considered separate species. Today it is considered a species within the cinereus group and is therefore considered to be closely related to the American masked red-toothed shrew, but not as a sister species.
On the basis of molecular biological investigations, a close relationship between the species of the Bering Sea could be established, which as a group contains the Saint Lawrence red- toothed shrew Sorex camtschatica , Sorex portenkoi , Sorex pribilofensis and Sorex ugyunak . Sorex haydeni and the American masked red- toothed shrew were identified as sister groups.
Apart from the nominate form, no further subspecies are distinguished within the species .
Threat and protection
The species is classified by the International Union for Conservation of Nature and Natural Resources (IUCN) as not endangered ("least concern") despite its limited distribution area, since no threats are known and a decline in the population is not to be feared.
literature
- Richard Sale: A Complete Guide to Arctic Wildlife. Christopher Helm, London 2006, ISBN 0-7136-7039-8 .
supporting documents
- ↑ a b c d Sorex jacksoni in the IUCN Red List of Threatened Species 2012.2. Listed by: N. Woodman, F. Reid, J. Matson, 1996. Retrieved June 24, 2013.
- ^ Richard Sale: A Complete Guide to Arctic Wildlife. Christopher Helm, London 2006, ISBN 0-7136-7039-8 .
- ↑ a b c Sorex (Otisorex) jacksoni ( Memento of the original from November 10, 2013 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . In: Don E. Wilson , DeeAnn M. Reeder (Eds.): Mammal Species of the World. A taxonomic and geographic Reference. 2 volumes. 3. Edition. Johns Hopkins University Press, Baltimore MD 2005, ISBN 0-8018-8221-4 .
- ↑ John R. Demboski, Joseph A. Cook: Phylogenetic diversification within the Sorex cinereus group (Soricidae). In: Journal of Mammalogy. Vol. 84, pp. 144-158, doi : 10.1644 / 1545-1542 (2003) 084 <0144: PDWTSC> 2.0.CO; 2 .
