Microtus ochrogaster
Prairie vole
Image of Microtus ochrogaster

Photo by John T. Legge 

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Key Characteristics

The prairie vole is a small mouse-like rodent (4.9 to 6.1 in/12.5 to 15.5 cm) with dark brown fur that has a salt-and-pepper coloration. It can be distinguished from the similar meadow vole by the tan (not gray) belly, 5 (instead of 4) small bumps (i.e., plantar tubercles) on the hind feet, and 3 (rather than 4) pairs of mammary glands.

Status and Rank

  • State Status: E
  • State Rank: S3
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Berrien51962
Cass11933
Kalamazoo22006
Van Buren11960
Distribution map for Microtus ochrogaster

Updated 7/21/2017. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

The prairie vole occurs in mesic to dry prairies. It is also found in ungrazed pastures, managed rights-of-way, old field borders, fallow fields, hay fields, and alfalfa and soybean fields. It prefers drier habitats than the meadow vole, but populations are lower in short, sparse grass than in tall, lush vegetation growth. They prefer a thick ground cover of herbaceous vegetation.

Natural Community Types

Methodology

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Management

Prairie, savanna, and other grassy habitats, as well as grassy corridors between grassy habitats should be maintained. Frequent mowing should be avoided. Any lack of cover can be detrimental to vole populations. Limiting factors for the species include intensive land-use patterns such as conversion to row crops and overuse of pesticides. An increase in non-native predator species (e.g., domestic cat) and densities has been associated with high rodent mortality. Grazing by large domesticated herbivores in tallgrass communities and possible displacement by other more common rodents such as meadow voles also may lead to declines in prairie vole populations.

Active Period

Breeding from first week of February to first week of November

Survey Methods

Prairie voles are most active just before dawn and from sunset until dark. Populations are strongly cyclical with peak densities occurring every 2 to 4 years, and as much as a 90% difference in population between peak years, so surveys in multiple consecutive years are recommended to adequately assess presence/absence and average population density. The voles make use of surface runways (1.4-3.5 in/3.5-8.9 cm in diameter) formed through the base of vegetation. Runways are the most conspicuous sign of vole presence; mole tunnels may also be used by the vole.

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Nov 22, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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