Long-tailed vole | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Rodentia |
Family: | Cricetidae |
Subfamily: | Arvicolinae |
Genus: | Microtus |
Subgenus: | Pitymys |
Species: | M. longicaudus |
Binomial name | |
Microtus longicaudus (Merriam, 1888) | |
Subspecies | |
List [2]
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Distribution of the long-tailed vole | |
Synonyms [3] | |
List
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The long-tailed vole (Microtus longicaudus), in some areas known as the San Bernardino long-tailed vole, is a small vole found in western North America. They have short ears and a long tail. Their fur is gray brown with light gray underparts. They are around 18 cm (7.1 in) long with an 8 cm (3.1 in) tail and weigh about 50 g (1.8 oz).
The scientific name of the long-tailed vole is Microtus longicaudus. The generic name, Microtus, derives from the Greek words μικρός meaning "small" + οὖς "ear". [4] In Latin, the species name longicaudus derives from longus meaning "long" and cauda meaning "tail". [4] The type specimen was a female collected by Vernon Orlando Bailey in the Black Hills at an altitude around 5,500 ft (1,700 m) near Custer, South Dakota, on July 19, 1887. [5] [6] The description was published by C. Hart Merriam in The American Naturalist the following year. [5] The original scientific name was Arvicola longicaudus. [5] Certain features of the molars were noted, which distinguished the long-tailed vole from other voles known at the time. [5] The species was formerly sometimes regarded as a member of the Old World genus Chionomys . [2]
The Coronation Island vole, once considered to be a separate species, is now believed to be a subspecies. [7]
The long-tailed vole is a small terrestrial mammal. [3] They are around 18 cm (7.1 in) long with an 8 cm (3.1 in) tail. They weigh on average 50 g (1.8 oz). [8] They have a thick body and a relatively long tail. [3] The tail is bicolored and extends greater than one-third the animal's total length. [3] The type specimen measured 185 mm (7.3 in), with a 65 millimetres (2.6 in) tail and a 21 millimetres (0.83 in) hind foot. [5] The ear measured 14 millimetres (0.55 in) x 8 millimetres (0.31 in) x 13 millimetres (0.51 in). [5]
The long-tailed vole is similar in size to the meadow vole (Microtus pennsylvanicus). [6] However, it has a longer tail, bigger ears, and grayer coat. In addition, the skull is flatter, and the cranium is wider. [6]
The middle upper molar lacks a posterior-internal loop or spur. [5] Merriam also noted some "peculiarities", not otherwise specified, in the original description, which distinguish the long-tailed vole from other species known in the late 1800s. [9] This first specimen Merriam described had large ears, with folds capable of closing the ear canal opening. [5] Relative to the overall length of the animal, the tail was longer than any other vole described at that time. [5] The fur is a sooty yellow-brown with some grizzled aspects. [5] There are hints of rust coloring on the mid back. [5] The whitish underside fur is a leaden gray towards the base. [5] The underside fur blends seamlessly with the fur on the sides of the vole. [5] The undersides of the tail are darker. [5] The feet are plumbeous, a leaden gray. [6]
The genitalia of the long-tailed vole have been described. The baculum has broad and straight proximal bone. It is similar in structure to that of the meadow vole, but with different proportions. The basal shaft is dumb-bell shaped in cross section and tapers to a blunt point at the end. The shaft is broad in dimension and connects via cartilaginous linkages to three lateral segments. The glans penis has a dorsal lobe elevated above a ventral rim. The rim has spiny fingerlike processes, but not the dorsal lobe. [10] A rod shaped os clitoridis may be present, in front of the urethra. [11]
Long-tailed voles can be found with unusual dentition. A female with grooved incisors was found in the Yukon. Several other voles from Oregon were found with flattened incisors and malocclusion of their incisors and molars. A specimen in New Mexico was reported with an extra tooth in the right lower jaw. [10] An albino vole was also found in New Mexico. [4]
Long-tailed voles do not usually have the hip glands, which are found in other members of the genus Microtus. These can develop if the animal is injected with testosterone. [10] Each eyelid of the long-tailed vole has around 3-4 meibomian glands. [10]
Fossil remains date towards the end of the Wisconsinian glaciation. [10] Fossils have been collected from: Moonshiner Cave in Idaho; Agate Basin and Little Box Elder Cave in Wyoming; Chimney Rock Animal Trap in Colorado; and Burnet Cave and Dry Cave in New Mexico. [10] The fossil remains of long-tailed voles may be difficult to distinguish from those of similar small voles, such as the meadow vole and the montane vole. [10] As such, collected fossils are identified based on probabilities of occurrence within the geographic range or with other associated species. [10]
These animals are found in a wide variety of habitats, including alpine meadows and shrubby areas, often near streams. [7] They may live in dense forests of conifers or in more arid, sagebrush type of habitats. They are common in areas of disturbed habitat, including areas of recent fire, deforestation, or mining. [7] In Alaska, they do well in areas where clear-cuts have been taken. [12] In the Yukon, they are found among spruce forests and where buffaloberry grow. [12]
In the Malheur National Wildlife Refuge, they reside among marshes of hardstem bullrush ( Schoenoplectus acutus ), cattail ( Typha latifolia ), baltic rush ( Juncus balticus ), and sedges ( Carex sp. ). [12]
They are found at elevations from sea level up to 3,650 m (11,980 ft) above sea level. [7] Near the southern and eastern limits of the geographic range, they tend to reside at higher elevations. [7] Their range extends throughout western North American. The northern limits are in east-central Alaska. [7] The range extends south through the western Canadian provinces of Alberta, British Columbia, Northwest Territories, and Yukon. [7] It extends south and east to include the states of: Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, South Dakota, Utah, Washington, Wyoming. [7]
Long-tailed voles are active year-round, usually during the day. [7] However, in Alaska, they have been observed nocturnally. [7] The usually are free ranging and do not make well defined runways. [7] The breeding season begins in May and extends through September or October, depending on location. [7] The female vole has on average two litters per year, but may have as few as 1 or as many as 4. [7] In northern areas, they may have only two litters over the course of their lifetime. [7] The size of the litter is typically four or five. [7] They may have as many as eight. [10] Long-tailed vole parents will respond to ultrasonic cries made by the newborns in distress. [4] It is unusual for long-tailed voles to live more than one year. [12] Females live longer than males. [12]
The long-tailed vole are apprehensive of other voles. [12] They are found in areas inhabited by other microtines, but generally avoid contact. [13] The montane vole is a more aggressive animal and is known to displace them from their habitat. [4] The more long-tailed voles in a given area, the more aggressive the montane voles become. [4]
They feed on green plants, assorted berries, seeds, and fungi. During the winter, diet may consist of the inner bark of shrubs and trees. [7] During winters in Nevada, they have been observed eating bark and leaves of sagebrush. [12]
Predators include barn owls, great horned owls, long-eared owls, and short-eared owls. [12] Prairie falcons, peregrine falcons, red-tailed hawks and marsh hawks are also reported as predators. [12] Known or suspected mustelid predators of the long-tailed vole include ermines, long-tailed weasels, and American pine martens. [12]
Long-tailed vole populations can fluctuate widely over a period of time within a given locale. Populations densities are generally sparse, with around 5-16 voles per hectare, but this can increase to more than 40. [7]
The International Union for Conservation of Nature and Natural Resources (IUCN) lists the animal as least concern. Long-tailed voles are common and have a very widespread geographic distribution, with a number of protected areas within the range. [7] They are also capable of adapting to changes in their environment as well. [7]
Voles are small rodents that are relatives of lemmings and hamsters, but with a stouter body; a longer, hairy tail; a slightly rounder head; smaller eyes and ears; and differently formed molars. They are sometimes known as meadow mice or field mice in North America.
The eastern meadow vole, sometimes called the field mouse or meadow mouse, is a North American vole found in eastern Canada and the United States. Its range extends farther south along the Atlantic coast.
Microtus is a genus of voles found in North America, Europe and northern Asia. The genus name refers to the small ears of these animals. They are stout rodents with short ears, legs and tails. They eat green vegetation such as grasses and sedges in summer, and grains, seeds, root and bark at other times. The genus is also called "meadow voles".
The North American water vole or just water vole is the largest North American vole. It is found in the northwestern United States and southern parts of western Canada. This animal has been historically considered a member of genus Arvicola, but molecular evidence demonstrates that it is more closely related to North American Microtus species. Water voles are on the USDA Forest Service Region 2 sensitive species list because they maintain very small populations and there is high concern that their required habitat may be declining.
The southern bog lemming is a small North American lemming. Its range overlaps with the other species in genus Synaptomys, the northern bog lemming, in southeastern Canada, but extends farther south.
The singing vole, is a medium-sized vole found in northwestern North America, including Alaska and northwestern Canada.
The rock vole, also known as the yellow-nosed vole, is a medium-sized species of vole found in eastern North America.
The prairie vole is a small vole found in central North America.
The short-tailed field vole, short-tailed vole, or simply field vole is a grey-brown vole, around 10 cm in length, with a short tail. It is one of the most common mammals in Europe, with a range extending from the Atlantic coast to Lake Baikal. These voles are found in moist grassy habitats, such as woodland, marsh or on river banks. Although they make shallow burrows, they usually build nests above ground. They are an important food source for owls and some other predators and their population size tends to peak and trough cyclically. Field voles breed prolifically, mainly in summer, but often all year round, even under snow. Females produce up to seven litters a year, each averaging from four to six young which are weaned after about fourteen days. The short-tailed field vole is both widespread and common and is listed as being of "Least Concern" by the IUCN.
The gray-tailed vole also known as the gray-tailed meadow vole or gray-tailed meadow mouse, is a rodent in the genus Microtus of the family Cricetidae. Voles are small mammals, and this species lies roughly in the middle of their size range. First collected in 1895, it is endemic to the Willamette Valley, Oregon, and Clark County, Washington, in the Pacific Northwest region of North America. Historically, they were found in the prairie areas of the Valley and, though many of these areas have been converted for agricultural purposes, these animals remain common. For reasons that remain unclear, vole population densities in any area may fluctuate widely from season to season and year to year. They are preyed upon by owls, hawks, and carnivorous mammals, and their parasites include fleas and ticks. These voles build burrows and complex tunnel networks, which they sometimes share with other burrowing animals. Relatively little is known about their behavior in the wild, because they are elusive and unlikely to enter traps.
The California vole is a type of vole which lives throughout much of California and part of southwestern Oregon. It is also known as the "California meadow mouse", a misnomer as this species is a vole, not a mouse. It averages 172 mm (6.8 in) in length although this length varies greatly between subspecies.
The Afghan vole is a species of rodent in the family Cricetidae. It is found in south-central Asia.
Irenomys tarsalis, also known as the Chilean climbing mouse, Chilean tree mouse, or long-footed irenomys, is a rodent found in Chile, from about 36° to 46°S, and in adjacent Argentina, mainly in forests. It is a large, long-tailed, soft-furred mouse characterized by grooved upper incisors and specialized molars with transverse ridges, divided by deep valleys, which are connected by a transverse ridge along the midline of the molars.
Cabrera's vole is a species of vole native to Spain and Portugal. It is named for Ángel Cabrera, a mammalogist then working at the Museo Nacional de Ciencias Naturales in Madrid. It is the only living member of the subgenus Iberomys, although two fossil species are also known, including M. brecciensis, the likely direct ancestor of the living species.
The Mediterranean pine vole is a species of rodent in the family Cricetidae. It is found in France, Andorra, Portugal, and Spain where it lives in a network of shallow tunnels.
The montane vole is a species of vole native to the western United States and Canada.
The creeping vole, sometimes known as the Oregon meadow mouse, is a small rodent in the family Cricetidae. Ranging across the Pacific Northwest of North America, it is found in forests, grasslands, woodlands, and chaparral environments. The small-tailed, furry, brownish-gray mammal was first described in the scientific literature in 1839, from a specimen collected near the mouth of the Columbia River. The smallest vole in its range, it weighs around 19 g. At birth, they weigh 1.6 g, are naked, pink, unable to open their eyes, and the ear flaps completely cover the ear openings. Although not always common throughout their range, there are no major concerns for their survival as a species.
The Zempoaltépec vole is a species of rodent in the family Cricetidae. The name Microtus is from the Greek word mikros meaning small and otus meaning ear. The name umbrosus could be from the Latin umbros meaning shady. It is rather large and has a long tail when compared with other voles. Its pelage is long and soft. In the upper parts, the hair is uniformly dusky with brown tips and the lower parts a dark grey thinly washed with a reddish yellow color. It is found only in Mexico, in a semi-isolated mountain range southeast of the Cajones River in Mixes district, in Oaxaca.
There are at least 9 large terrestrial mammals, 50 small mammals, and 14 marine mammal species known to occur in Olympic National Park.
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