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Sorex cinereus

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA MAMMALIA EULIPOTYPHLA SORICIDAE

Scientific Name: Sorex cinereus
Species Authority: Kerr, 1792
Common Name/s:
English Cinereus Shrew, Masked Shrew
Taxonomic Notes: Several formerly recognized subspecies recently have been regarded as distinct species (for example see van Zyll de Jong 1983). A population in western Washington and adjacent British Columbia was recognized as a distinct species (S. rohweri) by Rausch et al. (2007).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor/s: NatureServe
Reviewer/s: Amori, G. (Small Nonvolant Mammal Red List Authority) & Chanson, J. (Global Mammal Assessment Team)
Justification:
Listed as Least Concern because it is a widespread and abundant species with no major threats.

Geographic Range [top]

Range Description: This species occurs from Alaska, in the United States, to Labrador/Newfoundland in Canada, south to Washington, Utah, New Mexico, the Northern Great Plains, southern Indiana and Ohio, through the Appalachian Mountains to northern Georgia and western South Carolina, and on the east coast to New Jersey and northern Maryland in the United States (Whitaker, 2004).
Countries:
Native:
Canada; United States
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species is widespread and abundant.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: It occupies most terrestrial habitats excluding areas with very little or no vegetation. Thick leaf litter in damp forests may represent favoured habitat, although it appears to be adaptable to major successional disturbances. In Nova Scotia, diet indicated that much foraging was done among wreck on beaches (Stewart et al., 1989). Nest sites are typically in shallow burrows or above ground in logs and stumps. Breeding season may last from March through September (there is evidence of mid-winter births in at least some years in Nova Scotia) (Stewart et al. 1989). There are usually two litters, may be three. Gestation lasts 18 days, and litter size is two to 10 (average around seven). Young are weaned in three weeks. They reach sexual maturity in 20-26 weeks, and some young may breed in the year of their birth.

There are large annual fluctuations in population size. Density estimates range from one to 12 shrews per acre, with a home range of about 0.10 acre. They are usually in scattered, locally abundant populations. It rarely lives past a second summer.

It is a generalist, opportunistic invertivore, and eats primarily insects and other invertebrates, carrion, small vertebrates, occasionally seeds. It consumes daily its own weight in food, and is active throughout the day (and the year) to secure enough food to maintain high metabolic rate. Cloudy, rainy nights increase nocturnal activity.
Systems: Terrestrial

Threats [top]

Major Threat(s): There are no major threats to this species.

Conservation Actions [top]

Conservation Actions: This species occurs protected areas throughout its range.

Bibliography [top]

Rausch, R. L., Feagin, J. E. and Rausch, V. R. 2007. Sorex rohweri sp. nov. (Mammalia, Soricidae) from northwestern North America. Mammalian Biology 72: 93-105.

Stewart, D. T., Herman, T. B. and Teferi, T. 1989. Littoral feeding in a high-density insular population of Sorex cinereus. Canadian Journal of Zoology 67: 2074-2077.

van Zyll de Jong, C. 1983. Handbook of Canadian Mammals. National Museums of Canada, Ottawa, Canada.

Van Zyll De Jong, C. G. 1991. Speciation of the Sorex cinereus group. In: J. S. Findley and T. L. Yates (eds), The Biology of the Soricidae, pp. 65-73. Museum of Southwestern Biology.

Whitaker Jr., J. O. 2004. Sorex cinereus. Mammalian Species 743: 1-9.

Wilson, D. E. and Reeder, D. M. 1993. Mammal Species of the World. A Taxonomic and Geographic Reference. Smithsonian Institution Press, Washington, DC, USA.

Citation: NatureServe 2008. Sorex cinereus. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 23 April 2014.
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