Overview

Brief Summary

Biology

Although the European ground squirrel lives in burrows in loosely structured populations, it is not an exceptionally social or territorial species (2). In common with all ground-dwelling squirrels, it is mostly active during the hours of sunlight, devoting most of its attention to foraging for food. Roots, seeds, shoots and flowers comprise the bulk of this species' diet, but occasionally small invertebrates will also be taken (1) (4). However, as an important part of the food chain itself, it is commonly preyed upon by larger predators such as polecats and birds of prey (5) (6). During the summer months, there is a rise in foraging activity as each ground squirrel attempts to accumulate as much stored fat as possible before the onset of hibernation (2). Unlike many other ground squirrels, it does not stock-pile food but must rely on doubling its body mass to see it through the long winter (2) (3). Entering hibernation near the beginning of September, European ground squirrels do not appear from the underground burrows again until late March. Soon after emerging there is a scramble amongst the males to gain access to the reproductively active females. This period of breeding lasts three to four weeks, with each female mating with only one male. Following 25 days of development in the womb, the females give birth to a litter of 4 to 11 young which receive milk for around 30 days before being weaned. The young reach maturity after the following hibernation, but not all will breed in their first year (3).
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Comprehensive Description

Description

The European ground squirrel belongs to a genus commonly referred to as the sousliks, with representatives spread throughout the northern hemisphere from California to China (3). Ground squirrels tend to have stout, low-slung bodies, resting upon short legs, and a well-furred tail measuring about a third the length of the body (2) (3) (4). The European ground squirrel generally has short yellowish fur but the back is tinged distinctly grey with dense cream spots (2) (3). All species within the genus have sizeable internal cheek pouches for carrying food (3).
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Distribution

Range Description

The European souslik is endemic to central and south-eastern Europe, where it occurs at altitudes of 0-2,500 m. Its range is divided in two by the Carpathian mountains. The north-western portion extends through the Czech Republic, Austria, Slovakia, Hungary, northern Serbia and Montenegro, and western Romania, whilst the south-eastern portion extends from southern Serbia, Macedonia and Greece through Bulgaria and southern Romania to Turkish Thrace, Moldova and Ukraine (Panteleyev 1998, Kryštufek 1999).
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Geographic Range

Southeast Germany; Czech Republic; Slovakia; Southwest Poland through Southeast Europe to European Turkey; Moldova; Ukraine

Biogeographic Regions: palearctic (Native )

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Range

The European ground squirrel is endemic to central and eastern Europe, from the Czech Republic in the northwest to Turkey in the southeast (1). Historically, its western boundary extended into southeast Germany (1) (2).
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Physical Description

Morphology

Physical Description

The European souslik has a slender but strong body. The legs are relatively short; the forelegs and hind legs are about the same length (Parker, 1990). The back is yellow-gray and densily covered by whitish-yellow speckles or dots. The dots disappear on the sides of the body, and the belly is yellow. The chin and the throat are white. The European souslik has short and smooth body hair which becomes straighter and stiffer in winter (Parker, 1990). The external ears of the European souslik are flat. The forehead is broad and flat, causing the large eyes to be far apart. The cheek pouches are rather small. The tail is short, measuring about 3.8-7.4cm, and is coated with hair (Parker, 1990).

Average mass: 217 g.

Average basal metabolic rate: 1.272 W.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
The European souslik has quite specific habitat requirements. It is restricted to short-grass steppe and similar artificial habitats (pastures, lawns, sports fields, golf courses) on light, well-drained soils, where it can excavate its burrows (Kryštufek 1999, Spitzenberger 2002). It avoids cultivated land, with the exception of vineyards in some parts of its range (Spitzenberger 2002). It has an omnivorous diet including seeds, roots, shoots, flowers, and arthropods (Nowak 1999, Kryštufek pers. comm. 2006).

Systems
  • Terrestrial
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Habitat

European sousliks inhabit open landscapes. They prefer to live in prairies and steppes, rocky country, open woodlands, abandoned farms, and desert mountain ranges (Nowak, 1991). They avoid wet areas, the banks of permanent waters, or any type of wet areas created by accumulated water. (Parker, 1990). They are not found in areas with a dense forest cover (Nowak, 1991).

Terrestrial Biomes: savanna or grassland ; mountains

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Habitat

An inhabitant of open landscape without dense vegetation cover, the European ground squirrel is normally found in short-grass habitats on light, well-drained soils (1) (3). This includes a range of natural and artificial habitats such as steppe grassland, pasture, vineyards, sports fields and golf courses (1).
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Trophic Strategy

Food Habits

The European souslik feeds primarily on vegetation, nuts, seeds, and grains; however, individuals may also consume small invertebrates, small vertebrates, and birds'eggs (Emanoil, 1994; Nowak, 1991).

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Life History and Behavior

Life Expectancy

Lifespan/Longevity

Average lifespan

Status: captivity:
6.7 years.

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Lifespan, longevity, and ageing

Maximum longevity: 6.7 years (captivity)
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Reproduction

Reproduction

The gestation period of the European souslik is 25-26 days. European sousliks mate only once a year, producing 2-9 youngs per birth. The offspring are born naked; the eyes and the ears are still closed. The weaning period is about 30 days, and the males hardly participate in the weaning of a litter. European sousliks reach sexual maturity in 1 year (Parker, 1990).

Average gestation period: 27 days.

Average number of offspring: 6.

Average age at sexual or reproductive maturity (male)

Sex: male:
314 days.

Average age at sexual or reproductive maturity (female)

Sex: female:
314 days.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Spermophilus citellus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Species: 1
Species With Barcodes: 1

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
A2bc

Version
3.1

Year Assessed
2008

Assessor/s
Coroiu, C., Kryštufek, B., Vohralík, V. & Zagorodnyuk, I.

Reviewer/s
Amori, G. (Small Nonvolant Mammal Red List Authority) & Temple, H. (Global Mammal Assessment Team)

Contributor/s

Justification
Declines across the species' range are occurring, particularly in the southern and northwestern and northern areas where declines are more serious. Overall, declines are suspected to be more than 30% over the last ten years. For this reason the species is assessed as Vulnerable.

History
  • 1996
    Vulnerable
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Conservation Status

The European souslik has been declining rapidly in Europe because of the destruction of habitat through intensification of agriculture and large-scale reallotment of land. The species may now be extinct in some area. European sousliks are protected in Hungary and Poland. However, throughout this range, edge populations are steadily decreasing (Emanoil, 1994). Although European sousliks are disappearing in Europe, they are still common in other countries (Parker, 1990).

IUCN Red List of Threatened Species: vulnerable

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Status

Classified as Vulnerable (VU) on the IUCN Red List (1).
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Population

Population
The European souslik is currently in serious decline. Its population has become fragmented, and extinctions have occurred in peripheral parts of its range in Germany (where it went extinct c.1985 because of forestry) and Poland (where the last definite autochthonous records date from the 1970s, although the species has recently been reintroduced (Kryštufek 1999, H. Meinig pers. comm. 2006, A. Gondek pers. comm. 2006). Although there are still some large and apparently stable subpopulations, there have been many reports of declines, especially in the north-western part of its range; it is also declining in the southern part of the range. In optimal habitat, densities of 18-48 individuals per hectare have been recorded, although lower figures of 5-14 individuals per hectare are also reported (Kryštufek 1999). In Romania, the population has been estimated at c.15,000 (Botnariuc and Tatole 2005). In parts of Dobrudja (Romania and Bulgaria) populations may have stabilised and started to increase since 1989, as a result of abandonment of intensive agriculture following the fall of the communist regime (I. Coroiu and D. Murariu pers. comm. 2006). In Greece, populations of two subspecies macedonicus and graolojenici) have been lost (B. Kryštufek pers. comm. 2006).

In the Czech Republic there were 83 known localities in 1995, but by 2000-2001 only 26 of them still existed (Cepáková and Hulová 2002). Since 2001, there has been regular monitoring of S. citellus. Five new sites have been found, six colonies have disappeared, one was re-established due to reintroduction and one site has been naturally colonized following conservation management. Fluctuation or stagnation of abundance has been observed at eleven sites, numbers of sousliks have steadily decreased at seven sites, and only in five colonies have populations increased. In 2006 the total number of S. citellus living in the Czech Republic was estimated at 2,750 (J. Mateju unpublished data).

Population Trend
Decreasing
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Threats

Threats

Major Threats
The main threats to this species are the conversion of steppe-grassland and pasture to cultivated fields or forestry, and the abandonment of pasture and its subsequent reversion to tall-grass meadows or scrubby habitats which are not suitable for the souslik (Kryštufek 1999). In Austria it is therefore largely restricted to vineyards, airstrips, golflinks, sport- and camping grounds and other frequently mown lawns where it is completely dependent on the toleration of the owners (Spitzenberger 2002). Although not a major threat, some Gypsy communities in central and eastern Europe still catch sousliks for use as a traditional meal (J. Mateju pers. comm. 2006).
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Threats

The conversion of steppe grassland and pasture into cultivated farmland and forestry is chiefly responsible for a serious decline in the population of European ground squirrels (1) (3). As a consequence of the rapid loss of suitable habitat, the population is becoming severely fragmented, whilst its range is retracting, particularly in the west (1). Furthermore, as an integral part of the food chain, a decrease in the number of European ground squirrels is probably responsible for a decline in the populations of many other vulnerable species (5).
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Management

Conservation Actions

Conservation Actions
It is listed on Appendix II of the Bern Convention and Annexes II and IV of the EU Habitats and Species Directive. Research is needed to determine population status and trends, ecological requirements, potential threats, and appropriate conservation measures. In 2005, the species was reintroduced to Poland by the NGO Salamandra, and animals survived the first winter hibernation (A. Gondek pers. comm. 2006). In 2006 a project was initiated to reintroduce the species to Germany (H. Meinig pers. comm. 2006).
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Conservation

The European ground squirrel is listed on Appendix II of the Bern Convention and Annexes II and IV of the EU Habitats and Species Directive (1). Under this legislation, it is the responsibility of the countries within the species' range to ensure its conservation (7). In 2005, this species was reintroduced successfully to Poland and a project has recently been initiated to reintroduce it into Germany. One of the main priorities of conservation efforts is to conduct further studies into the ecology, threats and population biology of the European ground squirrel. This research will provide crucial data in determining appropriate future conservation measures (1).
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Wikipedia

European ground squirrel

The European ground squirrel (Spermophilus citellus), also known as the European souslik, is a species from the squirrel family Sciuridae and is besides the speckled ground squirrel (Spermophilus suslicus) the only European representative of the genus Spermophilus. Like all squirrels, it is a member of the rodent order.

Description

The European ground squirrel grows to a length of approximately 20 cm and a weight of between 200 and 400 g. It is a diurnal animal, living in colonies of individual burrows in pastures or grassy embankments. The squirrels emerge during the day to feed upon seeds, plant shoots and roots or flightless invertebrates. The colonies maintain sentinels who whistle at the sight of a predator, bringing the pack scurrying back to safety.

The European ground squirrel hibernates between autumn and March, depending on the climate. In preparation they will build up reserves of brown fat during the late summer.

In early summer, between 5 and 8 cubs are born in one litter.

Distribution

It is to be found throughout eastern Europe from southern Ukraine, to Asia Minor, Austria, the Czech Republic, Greece, Romania, Bulgaria, Macedonia and north as far as Poland.

References

  1. ^ Coroiu, C., Kryštufek, B., Vohralík, V. & Zagorodnyuk, I. (2008). Spermophilus citellus. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 8 January 2009.

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