American ermine explained

The American ermine or American stoat (Mustela richardsonii) is a species of mustelid native to most of North America.

Taxonomy

It was long considered conspecific with the stoat (M. erminea), but a 2021 study found it to be a distinct species, forming distinct genetic clades from erminea.[1] [2] [3] The finding has been accepted by the American Society of Mammalogists.[4] The Haida ermine (M. haidarum) is thought to be a hybrid species originating from ancient hybridization between M. erminea and M. richardsonii.

Etymology

The specific epithet refers to Arctic explorer and naturalist John Richardson.

Distribution

The species is found throughout most of North America aside from most of Alaska (although it is found on some islands in southeastern Alaska), eastern Yukon, most of Arctic Canada, and Greenland, where it is replaced by M. erminea. It reaches the northern extent of its range in Ellesmere Island and a portion of eastern mainland Nunavut and ranges from here to cover almost all of western North America south to northern New Mexico, and eastern North America south to northern Virginia. It is absent from most of the Southeastern United States and the Great Plains.

Diet

In North America, where the ecological niche for rat- and rabbit-sized prey is taken by the larger long-tailed weasel (Neogale frenata), the American ermine preys on mice, voles, shrews, young cottontails, chipmunks, deer mice, jumping mice, and house mice. Usually the ermine kills by biting at base of skull. Small birds, frogs, small fish, and earthworms are other types of prey for ermines.[5]

Habitat

Ermines live and find cover from predators in hollow spaces from logs, burrows and man made structures. Ermines sometimes den within their prey's nest and use their skin and fur as a lining for their den.

Breeding

They breed in dense parts of the forest. The season for breeding is late springtime to the summer from July to August. The males mature in a year while the females only take three to four weeks to mature. The females carry a litter of four to seven babies for 255 days then gives birth.

Predators

Some of the larger wild predators of ermines are minks, martens, fishers, bobcats, coyotes, and large owls and hawks. Occasionally a domesticated cat or dog may kill an ermine. Their small agile bodies help them evade these predators, while also allow them to compete with their predators for food in more barren months.

Subspecies

About 13 subspecies are known:

SubspeciesTrinomial authorityDescriptionRangeSynonyms
Junean stoatM. r. alascensis.Merriam, 1896Similar to M. r. richardsonii, but with a broader skull and more extensive white tips on the limbsJuneau, Alaska
Vancouver Island stoatM. r. anguinaeHall, 1932Vancouver Island
Western Great Lakes stoatM. r. bangsiHall, 1945The region west of the Great Lakescicognani (Mearns, 1891)pusillus (Aughey, 1880)
Bonaparte's stoatM. r. cigognaniiBonaparte, 1838A small subspecies with a dark brown summer coat; its skull is more lightly built than that of richardsonii.The region north and east of the Great Lakespusilla (DeKay, 1842)vulgaris (Griffith, 1827)
M. r. fallendaHall, 1945
M. r. gulosaHall, 1945
M. r. initisHall, 1945
M. r. invictaHall, 1945
Southwestern stoatM. r. muricusBangs, 1899The southwestern extremity of the species' American range (Nevada, Utah, Colorado and other states)leptus (Merriam, 1903)
Olympic stoatM. r. olympicaHall, 1945The Olympic Peninsula, Washington
Richardson's stoatM. r. richardsoniiBonaparte, 1838Similar to M. r. cigognanii, but larger, with a dull chocolate brown summer coatNewfoundland, Labrador and nearly all of Canada (save for the ranges of other American stoat subspecies)imperii (Barrett-Hamilton, 1904)microtis (J. A. Allen, 1903)

mortigena (Bangs, 1913)

Baffin Island stoatM. r. sempleiSutton and Hamilton, 1932Baffin Island and the adjacent parts of the mainlandlabiata (Degerbøl, 1935)
M. r. stratoriMerriam, 1896

Relationships with humans

The fur of ermine was valued by the Tlingit and other indigenous peoples of the Pacific Northwest Coast. They could be attached to traditional regalia and cedar bark hats as status symbols or made into shirts.[6]

Bibliography

Notes and References

  1. Colella. Jocelyn P.. Frederick. Lindsey M.. Talbot. Sandra L.. Cook. Joseph A.. 2021. Extrinsically reinforced hybrid speciation within Holarctic ermine (Mustela spp.) produces an insular endemic. Diversity and Distributions. en. 27. 4. 747–762. 10.1111/ddi.13234. 1472-4642. free. 2021DivDi..27..747C .
  2. Web site: Distinct Species of Adorable Weasels Have Been Hiding in Plain Sight. 2021-07-12. Gizmodo. 13 April 2021 . en-us.
  3. Web site: Adorable Killer Ermines Found To Contain Three Distinct Species Of Fluffy Weasels. 2021-07-12. IFLScience. 15 April 2021 . en.
  4. Web site: Mustela richardsonii Bonaparte, 1838. 2021-07-12. www.mammaldiversity.org.
  5. Ahlborn, G. “Life History Account for Ermine.” Life History Accounts for Species in the California Wildlife Habitat Relationships (CWHR) System, 1988.
  6. Web site: Tlingit Ermine-Skin Shirt (Daa dugu k'oodas').