Gray marmot

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Gray marmot
Marmota baibacina.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Sciuridae
Genus: Marmota
Species:
M. baibacina
Binomial name
Marmota baibacina
Kastschenko, 1899

The gray marmot, grey marmot, or Altai marmot (Marmota baibacina) is a species of rodent in the squirrel family Sciuridae. It is one of the larger marmots in the genus Marmota. It occurs in mountainous grasslands and shrub lands of central Asia, and is one of the 9 Palearctic (Eurasia) species. It is found in Xinjiang Province in China, southeastern Kazakhstan, Kyrgyzstan, Mongolia, and in the Altai and Tien Shan Mountains in southeastern Siberia in Russia. [2] In the Mongolian Altai, its range overlaps with that of the Tarbagan marmot. [3] Gray marmots form social groups, live in burrows, and hibernate.

Contents

Description

Gray marmots are one of the largest palearctic species, weighing 4 to 6.5 kg (9 to 14.5 pounds), with some individuals reaching near 8 kg (18 pounds) before hibernation. [4] Body size varies based on the time of year (before/after hibernation), and with latitude and elevation. [5] Overall, body size increases at higher latitude and elevation and decreases at lower latitudes and elevation. Gray marmots may lose up to 30% of body mass during long seasonal hibernation. [5] They are short and stocky with brawny limbs and short tails. The total body length ranges from about 60 to 80 cm (25 to 30 inches) which includes the 13-to-15-centimetre-long (5 to 6 in) tail. Forefeet have 4 digits and strong claws for digging, while the hindfeet have 5 digits. [6] [4] On the dorsal (back) side, the fur is beige to tan with brown to black hairs or hair tips blended throughout giving the coat a gray appearance. The ventral (belly) side is a more orange-reddish brown. The length of the tail is much like the body but has a dark brown to black tip. The ears are small and round and light colored. The face is darker brown at the cheeks with lighter yellowish brown around the mouth. [4] [6] Albinism occurs in this species. [5] Gray marmots are not known to exhibit sexual dimorphism (differences between males and females), but in most marmot species the adult males are larger than adult females. [4] [7] [8] Gray marmots also have cheek glands and anal glands. [5] [8]

Distribution and habitat

Gray marmots live in mountain meadows and steppes, where they forage on sage bush in the spring, grasses and flowering plants in summer and fall. [6] [5] [9] [10] They occur in elevations from 150 to 4,000 m (490 to 13,120 feet), but may prefer mild to moderate well draining slopes with suitable soil for burrowing. The soil ranges from fine grained soft soil to soil including sand or pebbles. [4] [8] [9] [11] Their distribution extends from the Altai mountains of southwestern Siberia (Tuva, Russia), western Mongolia, northwestern China (Xinjiang), and eastern Kazakhstan, into the Tien Shan mountains of northwestern China, Kyrgyzstan, and southeastern Kazakhstan. In southeastern Kazakhstan and southwestern Siberia the range enters lower elevation, dry steppes. [2] [4] [6] [9] The gray marmot is an introduced species in the Caucasus mountains of Dagestan, Russia. [4] In the Altai mountains of western Mongolia, the range overlaps with the Tarbagan marmot (Marmota sibirica). In this area of range overlap, competition restricts the gray marmot habitat to elevations above 3,000 m (9,800 feet) in areas with scattered boulders and rocks. Observation of hybridization between the two species and living in the same area are rare. [3] [11]

Fossil record

Fossils of the gray marmot are known from Denisova Cave, famous for being the site of the discovery of the first remains of Denisovans. [12]

Life history and behavior

Sociality

Gray marmots live in social groups called extended families with multiple individuals living in a burrow and several burrows forming a colony. [4] The extended families usually consist of a pair of dominant adults and a few subordinate adults, yearling and babies. [5] Gray marmots also have species specific alarm calls, which can be used to distinguish them from other species. [3] [11] When environmental conditions are harsh extended families are limited. When conditions are moderate to good the extended families become more complex. [5]

Hibernation

Gray marmots live in harsh environments with snowfall limiting food for a significant amount of time. [5] [10] They have evolved a yearly pattern of hibernation, reproduction, growth and then fattening for the next hibernation. [10] Gray marmots hibernate for 7–8 months starting in fall and emerging in May. [4] [5] [6] Hibernation starts between August and October depending on the location of the population, and populations at lower altitude or on south facing slopes emerge sooner. [5] [6] [10]

Burrows

Gray marmots dig extensive winter burrows for hibernation, reaching depths of 5–7 m (15–25 feet) with some tunnels up to 63 m (205 feet) long. [8] [10] Winter burrows hold 10 or more individuals which helps them stay warm with less energy use. Summer burrows are less deep and hold only a few individuals. [6]

Reproduction

Gray marmots mate in early May, and often mate in burrows before they emerge from hibernation. [5] Mating may be monogamous or polyandrous. Gestation last 40 days and the female gives birth to 2–6 babies. [4] [5] [6] Females reach reproductive maturity at 2–3 years. [5] Females alternate years of reproduction, and reabsorb embryos in harsh environmental conditions. [4] [5]

Predators

Marmot hunted by a snow leopard in Sarychat-Eertash Nature Reserve, Kyrgyzstan Wild Snow Leopard Goes Grocery Shopping.png
Marmot hunted by a snow leopard in Sarychat-Eertash Nature Reserve, Kyrgyzstan

Predators of gray marmots include wolves, foxes, dogs, polecats, Pallas's cat, and predator birds such as hawks and falcons. [4] [6] Gray marmots use alarm calls to warn family members of predator presence. [5]

Communication

Gray marmots have anal and cheek glands used for communication of dominance and possibly defense. [5] [8] They use tail movements as visual cues, and various vocalizations such a growls, high pitched cries, whining and alarm calls. [5] [8] [11]

Taxonomy

The gray marmot is a palearctic species in the subgenus Marmota . It is most related to the forest-steppe marmot (Marmota kastschenkoi), which was considered a subspecies of the gray marmot until recently recognized a distinct species. [4] [5] [9] The bobak marmot (Marmota bobak) is a sister group to these species and the lineage the gray marmot is thought to evolve from. [5] The gray marmot has two recognized subspecies Marmota baibacina baibacina and Marmota baibacina centralis. [4]

Related Research Articles

<span class="mw-page-title-main">Groundhog</span> Species of mammal (rodent in the marmot genus)

The groundhog, also known as the woodchuck, is a rodent of the family Sciuridae, belonging to the group of large ground squirrels known as marmots. The groundhog is a lowland creature of North America; it is found through much of the Eastern United States, across Canada and into Alaska. It was first scientifically described by Carl Linnaeus in 1758.

<span class="mw-page-title-main">Marmot</span> Genus of mammals (large ground squirrels)

Marmots are large ground squirrels in the genus Marmota, with 15 species living in Asia, Europe, and North America. These herbivores are active during the summer, when they can often be found in groups, but are not seen during the winter, when they hibernate underground. They are the heaviest members of the squirrel family.

<span class="mw-page-title-main">Hoary marmot</span> Species of rodent

The hoary marmot is a species of marmot that inhabits the mountains of northwest North America. Hoary marmots live near the tree line on slopes with grasses and forbs to eat and rocky areas for cover.

<span class="mw-page-title-main">Vancouver Island marmot</span> Species of rodent

The Vancouver Island marmot naturally occurs only in the high mountains of Vancouver Island, in British Columbia. This particular marmot species is large compared to some other marmots, and most other rodents. Marmots are the largest members of the Sciuridae family, with weights of adults varying from 3 to 7 kg depending on age and time of year.

<span class="mw-page-title-main">Yellow-bellied marmot</span> Species of rodent

The yellow-bellied marmot, also known as the rock chuck, is a large, stout-bodied ground squirrel in the marmot genus. It is one of fourteen species of marmots, and is native to mountainous and semi-arid regions of southwestern Canada and western United States, including the Rocky Mountains, Sierra Nevada, and the Great Basin, often living above 2,000 metres. The fur is mainly brown, with a dark bushy tail, yellow chest and white patch between the eyes, and they weigh up to approximately 5 kilograms. They live in burrows in colonies of up to twenty individuals with a single dominant male. They are diurnal and feed on plant material, insects, and bird eggs. They hibernate for approximately eight months starting in September and lasting through the winter.

<span class="mw-page-title-main">Alpine marmot</span> Species of rodent

The alpine marmot is a large ground-dwelling squirrel, from the genus of marmots. It is found in high numbers in mountainous areas of central and southern Europe, at heights between 800 and 3,200 m (2,600–10,500 ft) in the Alps, Carpathians, Tatras and Northern Apennines. In 1948 they were reintroduced with success in the Pyrenees, where the alpine marmot had disappeared at end of the Pleistocene epoch.

<span class="mw-page-title-main">Olympic marmot</span> Rodent in the squirrel family from the U.S. state of Washington

The Olympic marmot is a rodent in the squirrel family, Sciuridae; it occurs only in the U.S. state of Washington, on the middle elevations of the Olympic Peninsula. The closest relatives of this species are the hoary marmot and the Vancouver Island marmot. In 2009, it was declared the official endemic mammal of Washington.

<span class="mw-page-title-main">Himalayan marmot</span> Species of rodent

The Himalayan marmot is a marmot species that inhabits alpine grasslands throughout the Himalayas and on the Tibetan Plateau. It is IUCN Red Listed as Least Concern because of its wide range and possibly large population.

<span class="mw-page-title-main">Bobak marmot</span> Species of rodent

The bobak marmot, also known as the steppe marmot, is a species of marmot that inhabits the steppes of Eastern Europe and Central Asia. It is a social animal and inhabits steppe grassland, including cultivated field borders. It hibernates for more than half the year. Litter sizes average about five offspring and it takes three years for the young marmots to reach sexual maturity. Male offspring leave the home colony after their second winter, and about 60% of mature females give birth in any one year.

<span class="mw-page-title-main">Mongolian–Manchurian grassland</span> Ecoregion in East Asia

The Mongolian-Manchurian grassland, also known as the Mongolian-Manchurian steppe or Gobi-Manchurian steppe, in the temperate grassland biome, is an ecoregion in East Asia covering parts of Mongolia, the Chinese Autonomous region of Inner Mongolia, and Northeast China.

<span class="mw-page-title-main">Long-tailed marmot</span> Species of rodent

The long-tailed marmot or golden marmot is a marmot species in the family Sciuridae. It occurs in mountainous regions in the central parts of Asia where it lives in open or lightly wooded habitats, often among rocks where dwarf junipers grow. It is IUCN Red Listed as Least Concern. As suggested by its name, it is a relatively long-tailed species of marmot.

<span class="mw-page-title-main">Alaska marmot</span> Species of rodent

The Alaska marmot, also known as the Brooks Range marmot or the Brower's marmot, is a species of rodent in the family Sciuridae. Once considered to be the same species as the hoary marmot, it is now known to be unique. Alaska marmots are found in the scree slopes of the Brooks Range, Alaska. Specifically, they prefer to dwell on rocky, mountainous terrain, generally near lakes. They eat vegetation found on mountainsides, such as grasses, seeds, and lichen. Their relatively thick bodies are covered in dense, grey fur. They live in large colonies that consist of multiple families. During the winter, they hibernate for long periods of time in burrows. While not well researched, they are not believed to be particularly threatened, by human activity or otherwise. The Alaskan government has designated February 2 as "Marmot Day," a holiday intended to recognize the prevalence of marmots in the state, similar to the more widely celebrated American holiday of Groundhog Day.

<span class="mw-page-title-main">Black-capped marmot</span> Species of rodent

The black-capped marmot is a species of rodent in the family Sciuridae. It is endemic to the Russian Far East, but its range is discontinuous and divided into three main parts, each with its own subspecies. The black-capped marmot lives in arctic tundra and alpine habitats from near sea-level to an altitude of 2,000 m (6,600 ft). Depending on exact subpopulation, they hibernate for 6–8 months each year, which is long for a marmot.

<span class="mw-page-title-main">Menzbier's marmot</span> Species of rodent

The Menzbier's marmot is a species of rodent in the family Sciuridae from Central Asia. Its name commemorates Russian zoologist Mikhail Aleksandrovich Menzbier.

<span class="mw-page-title-main">Tarbagan marmot</span> Species of mammal

The tarbagan marmot is a species of rodent in the family Sciuridae. It is found in China, northern and western Mongolia, and Russia. In the Mongolian Altai Mountains, its range overlaps with that of the Gray marmot. The species was classified as endangered by the IUCN in 2008.

<span class="mw-page-title-main">Long-tailed ground squirrel</span> Species of rodent

The long-tailed ground squirrel or Eversmann's souslik is a species of rodent in the squirrel family Sciuridae. It is found in China, Kazakhstan, Mongolia, and Russia.

Spermophilus brevicauda is a species of rodent in the family Sciuridae. It is found in eastern Kazakhstan and the northern half of the Xinjiang region of China.

The forest-steppe marmot is a rodent species of the marmot genus found in south-central Russia. It lives in wooded forest steppe at an altitude of 180–450 m (590–1,480 ft) in a relatively small region located directly east of the upper Ob River. It has traditionally been considered a subspecies of the similar, more southerly distributed gray marmot, but was separated mainly due to different diploid numbers. Forest-steppe marmots have a head-and-body length of 45–66 cm (18–26 in), and light individuals weigh as little as 3 kg (6.6 lb) in the spring and heavy individuals as much as 8.9 kg (20 lb) in the autumn. It hibernates for about 612 months starting in August or September.

<span class="mw-page-title-main">Altai montane forest and forest steppe</span> Ecoregion in the Altai Mountains

The Altai montane forest and forest steppe ecoregion covers patches of the subalpine forest belt on the Altai Mountains, crossing the border region where Russia, Kazakhstan, Mongolia and China meet. The region has high biodiversity, as it is located in transition zones between different ecoregions, altitudes, and climate zones. It is in the Palearctic realm, with a Cold semi-arid climate. It covers 35,199,998 km2 (13,590,795 sq mi).

<span class="mw-page-title-main">Sayan montane conifer forests</span> Coniferous forests in Russia and Mongolia

The Sayan montane conifer forests ecoregion covers the mid-elevation levels of the Sayan Mountains, the high mountain range between the taiga of Siberia, Russia to the north, and the steppes of Mongolia to the south. The slopes of the mountains at the mid-altitudes are covered by Temperate coniferous forest. The ecoregion is in the Palearctic realm, with a cold semi-arid climate. It covers 35,741,835 km2 (13,800,000 sq mi).

References

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