Orkney vole | |
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Orkney vole (Microtus arvalis orcadensis) in the Natural History Museum at Tring | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Rodentia |
Family: | Cricetidae |
Subfamily: | Arvicolinae |
Genus: | Microtus |
Species: | |
Subspecies: | M. a. orcadensis |
Trinomial name | |
Microtus arvalis orcadensis Millais, 1904 | |
Synonyms | |
Microtus orcadensis Contents |
The Orkney vole (Microtus arvalis orcadensis) is a population of the common vole (Microtus arvalis) found in the Orkney Islands, off the northern coast of Scotland, as well as in the Channel Island of Guernsey. [3] Orkney voles are about 10% larger than voles from other populations of the common vole. [3] The common vole is absent from the rest of the British Isles.
The Orkney vole occurs on nine islands of the group, Mainland, Sanday, Westray, Rousay, South Ronaldsay, Burray, Eday, Shapinsay, and Stronsay. [4]
In the past the populations on each of these islands have been named as subspecies, and the Orkney vole as a whole is considered by some taxonomists to be a subspecies of the common vole because of its size difference from the common vole. However, others do not recognise any subspecies of the common vole, [2] especially since DNA analysis indicates transport by Neolithic humans from what is now Belgium. [5] Chromosome studies have shown however, that despite being twice as heavy as continental voles, they are conspecific and should be regarded as a subspecies. [4]
Microtus arvalis does not occur in mainland Britain, nor elsewhere in the British Isles. The current leading hypothesis for the development of this disjunct population is that voles were introduced to the Orkney archipelago by humans in Neolithic times, possibly concealed in animal fodder. The oldest known radiocarbon-dated fossil of the species in Orkney is 4,600 years old: this marks the latest possible date of introduction. [4]
It was once hypothesized that the Orkney voles were a relict population, left behind when the land-bridge connecting Scotland and Orkney had disappeared, by the date that the more competitive Microtus agrestis had reached Northern Scotland, though this theory has since been rejected based on paleontological, ecological, biological and geological evidence.
Orkney, also known as the Orkney Islands, is an archipelago off the north coast of Scotland. The plural name the Orkneys is also sometimes used, but is now considered incorrect. Part of the Northern Isles along with Shetland, Orkney is 10 miles (16 km) north of Caithness and has about 70 islands, of which 20 are inhabited. The largest island, the Mainland, has an area of 523 square kilometres (202 sq mi), making it the sixth-largest Scottish island and the tenth-largest island in the British Isles. Orkney's largest settlement, and also its administrative centre, is Kirkwall.
The short-eared owl is a widespread grassland species in the family Strigidae. Owls belonging to genus Asio are known as the eared owls, as they have tufts of feathers resembling mammalian ears. These "ear" tufts may or may not be visible. The short-eared owl will display its tufts when in a defensive pose, although its very short tufts are usually not visible. The short-eared owl is found in open country and grasslands.
The Mainland, also known as Hrossey and Pomona, is the main island of Orkney, Scotland. Both of Orkney's burghs, Kirkwall and Stromness, lie on the island, which is also the heart of Orkney's ferry and air connections.
Westray is one of the Orkney Islands in Scotland, with a usual resident population of just under 600 people. Its main village is Pierowall, with a heritage centre, the 15th-century Lady Kirk church and pedestrian ferry service to nearby Papa Westray island. Westray has a number of archeological sites dating from 3500 BC, and remains of several Norse-Viking settlements. The spectacular sea cliffs around Noup Head are home to thousands of seabirds.
South Ronaldsay is one of the Orkney Islands off the north coast of Scotland. It is linked to the Orkney Mainland by the Churchill Barriers, running via Burray, Glimps Holm and Lamb Holm.
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 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 bank vole is a small vole with red-brown fur and some grey patches, with a tail about half as long as its body. A rodent, it lives in woodland areas and is around 100 millimetres (3.9 in) in length. The bank vole is found in much of Europe and in northwestern Asia. It is native to Great Britain but not to Ireland, where it has been accidentally introduced, and has now colonised much of the south and southwest.
The common vole is a European rodent.
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 fauna of Scotland is generally typical of the northwest European part of the Palearctic realm, although several of the country's larger mammals were hunted to extinction in historic times and human activity has also led to various species of wildlife being introduced. Scotland's diverse temperate environments support 62 species of wild mammals, including a population of wild cats, important numbers of grey and harbour seals and the most northerly colony of bottlenose dolphins in the world.
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 beach vole or Muskeget vole is a rodent in the family Cricetidae. This close relative of the eastern meadow vole is endemic to the 0.87 km2 Muskeget Island, Massachusetts. Due to its relatively short period of reproductive isolation, there is debate over the beach vole's designation as a subspecies of M. pennsylvanicus.
Prehistoric Shetland refers to the prehistoric period of the Shetland archipelago of Scotland, when it was first occupied by humans. The period prior to human settlement in Shetland is known as the geology of Scotland. Prehistory in Shetland does not end until the beginning of the Early Medieval Period in Scotland, around AD 600. More than 5,000 archaeological sites have been recorded in the Shetland Islands.
Igor Zagorodniuk is a Ukrainian zoologist, mammalogist, ecologist, and founder of Theriological school. He is a laureate of the State Prize of Ukraine in the field of science and technology (2015), and the author of more than 500 scientific publications.
Caroline Rosa Wickham-Jones MA MSocSci FSA HonFSAScot MCIfA(25 April 1955 – 13 January 2022) was a British archaeologist specialising in Stone Age Orkney. She was a lecturer at the University of Aberdeen until her retirement in 2015.
The western meadow vole is a species of North American vole found in western North America, the midwestern United States, western Ontario, Canada, and formerly in Mexico. It was previously considered conspecific with the eastern meadow vole, but genetic studies indicate that it is a distinct species. It is sometimes called the field mouse or meadow mouse, although these common names can also refer to other species.
The 2007 vole plague began in early summer 2006 in the province of Palencia, in the Spanish autonomous community of Castile and León. In the summer of 2007, crops in the plateau fields were devastated by rodents. In September 2007, after a summer of severe losses, the density of rodents decreased throughout the community and the plague was institutionally considered to be over. However, there was an abundance of voles during the following months. Only the winter frosts and the low temperatures of November and December reduced vole numbers to normal.