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Eurasian beaver

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Eurasian beaver
A Eurasian beaver in Norway
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Castoridae
Genus: Castor
Species:
C. fiber
Binomial name
Castor fiber
  Castor fiber: Extant (resident)
  Castor fiber: Extant & Introduced (resident)
  Castor canadensis: Extant & Introduced (resident)
in the Narew River, Poland

The Eurasian beaver (Castor fiber) or European beaver is a species of beaver widespread across Eurasia, with a rapidly increasing population of at least 1.5 million in 2020.[2] The Eurasian beaver was hunted to near-extinction for both its fur and castoreum; with only about 1,200 beavers in eight relict populations from France to Mongolia in the early 20th century.[2] It has since been reintroduced to much of its former range, and now lives from China and Mongolia through Russia, Scandinavia and Eastern, Central, Southern and Western Europe, with about half the population in Russia.[2] [3][page needed] It is listed as least concern on the IUCN Red List.[1]

Taxonomy[edit]

Castor fiber was the scientific name used by Carl Linnaeus in 1758, who described the beaver in his work Systema Naturae.[4] Between 1792 and 1997, several Eurasian beaver zoological specimens were described and proposed as subspecies, including:[5]

These descriptions were largely based on very small differences in fur colour and cranial morphology, none of which warrant a subspecific distinction.[9] In 2005, analysis of mitochondrial DNA of Eurasian beaver samples showed that only two evolutionarily significant units exist: a western phylogroup in Western and Central Europe, and an eastern phylogroup in the region east of the Oder and Vistula rivers.[10] The eastern phylogroup is genetically more diverse, but still at a degree below thresholds considered sufficient for subspecific differentiation.[11]

Description[edit]

The Eurasian beaver's fur colour varies between regions. Light, chestnut-rust is the dominant colour in Belarus. In Russia's Sozh River basin, it is predominantly blackish brown, while in the Voronezh Nature Reserve beavers are both brown and blackish-brown.[3]

The Eurasian beaver is one of the largest living rodent species and the largest rodent native to Eurasia. Its head-to-body length is 80–100 cm (31–39 in) with a 25–50 cm (9.8–19.7 in) long tail length. It weighs around 11–30 kg (24–66 lb).[3] By the average weights known, it appears to be the world's second heaviest rodent after the capybara, and is slightly larger and heavier than the North American beaver.[12][13][14] One exceptionally large recorded specimen weighed 31.7 kg (70 lb), but it is reportedly possible for the species to exceptionally exceed 40 kg (88 lb).[15]

Differences from North American beaver[edit]

Skulls of a European and North American beaver

Although the Eurasian beaver appears superficially similar to the North American beaver, there are several important differences, chief among these being that the North American beaver has 40 chromosomes, while the Eurasian beaver has 48. The two species are not genetically compatible: the result of over 27 attempts in Russia to hybridise the two species was just one stillborn kit, bred from the pairing of a male North American beaver and a female Eurasian beaver. The difference in chromosome count makes interspecific breeding unlikely in areas where the two species' ranges overlap.[3]

Fur[edit]

The guard hairs of the Eurasian beaver have longer hollow medullae at their tips. There is also a difference in the frequency of fur colours: 66% of Eurasian beavers overall have beige or pale brown fur, 20% have reddish brown, nearly 8% are brown, and only 4% have blackish coats; among North American beavers, 50% have pale brown fur, 25% are reddish brown, 20% are brown, and 6% are blackish.[3]

Head[edit]

The Eurasian beaver has a larger, less rounded head; a longer, narrower muzzle. The Eurasian beaver also has longer nasal bones, with the widest point being at the end of the snout; in the case of the North American beaver, the widest point is at the middle of the snout. The Eurasian beaver has a triangular nasal opening, unlike those of the North American beavers, which are square. Furthermore, the foramen magnum is rounded in the Eurasian beaver, but triangular in the North American beaver.[citation needed]

Body[edit]

The Eurasian beaver has shorter shin bones than the North American species and a narrower, less oval-shaped tail, making it less capable of bipedal locomotion. The anal glands of the Eurasian beaver are larger, and thin-walled, with a large internal volume, relative to that of the North American beaver.[citation needed]

Behaviour and ecology[edit]

Further information: Environmental impacts of beavers
Signs of beaver activity
Large beaver dam in Lithuania
Beaver lodge in Poland

The Eurasian beaver is a keystone species, as it helps to support the ecosystem which it inhabits. It creates wetlands, which provide habitat for European water vole, Eurasian otter and Eurasian water shrew. By coppicing waterside trees and shrubs it facilitates their regrowth as dense shrubs, thus providing cover for birds and other animals. Beavers build dams that trap sediment, improve water quality, recharge groundwater tables and increase cover and forage for trout and salmon.[16] Also, abundance and diversity of vespertilionid bats increase, apparently because of gaps created in forests, making it easier for bats to navigate.[17]

Reproduction[edit]

Sleeping Eurasian beaver in Osmussaar
Eurasian beaver with her kit along the River Tay

Eurasian beavers have one litter per year, coming into oestrus for only 12 to 24 hours, between late December and May, but peaking in January. Unlike most other rodents, beaver pairs are monogamous, staying together for multiple breeding seasons. Gestation averages 107 days and they average three kits per litter with a range of two to six kits. Most beavers do not reproduce until they are three years of age, but about 20% of two-year-old females reproduce.[18]

Diet[edit]

European beavers are herbivorous, eating "water and river bank plants", including tubers, "rootstocks of myrtles, cattails, water lilies", and also trees, including softwood tree bark. Their long appendices and the microorganisms within make possible the digestion of bark cellulose. Their daily food intake is approximately 20% of their body weight.[19]

Distribution and habitat[edit]

The Eurasian beaver is recovering from near extinction, after depredation by humans for its fur and for castoreum, a secretion of its scent gland believed to have medicinal properties.[20] The estimated population was only 1,200 by the early 20th century.[21][22] In many European nations, the Eurasian beaver became extinct, but reintroduction and protection programmes led to gradual recovery so that by 2020, the population was at least 1.5 million.[2] It likely survived east of the Ural Mountains from a 19th-century population as low as 300 animals. Factors contributing to their survival include their ability to maintain sufficient genetic diversity to recover from a population as low as three individuals, and that beavers are monogamous and select mates that are genetically different from themselves.[23][24] About 83% of Eurasian beavers live in the former Soviet Union due to reintroductions.[11]

Continental Europe[edit]

Eurasian beaver

The Eurasian beaver lives in almost all countries in Continental Europe, from Spain, France and the United Kingdom in the West, to Russia and Moldova in the East, and Montenegro, Serbia and Bulgaria in the South-East. In 2022, beaver signs were found in Portugal, near the border with Spain. The only significant areas where it has no known population are the Southern Balkans: Albania, Kosovo, Northern Macedonia, Greece and European Turkey. It is also not known to be present in the microstates of Andorra, Monaco, San Marino and Vatican City. [25] [26]

In Spain, the beaver was extirpated in the 17th century. In 2003, 18 beavers were unofficially released. Current range includes the Ebro river in La Rioja, Navarre, and Zaragoza; the Zadorra river up to Vitoria-Gasteiz, the Arga river up to Pamplona, the Huerva river up to Mezalocha, and the Jalón river into the province of Soria.[27] In November 2021, a young beaver was photographed for the first time outside the Ebro basin, in the upper Douro river in Soria.[28] In 2020, the population was estimated to be more than 1,000.[2]

In Portugal, the beaver was distributed mostly in the main river basins north of the Tagus River,[29] until it was extirpated around 1450[2]. In 2023, signs of beaver activity were found on the Douro river about 5 km from the Spanish border.[30]

In France, the Eurasian beaver was almost extirpated by the late 19th century, with only a small population of about 100 individuals surviving in the lower Rhône valley. Following protection measures in 1968 and 26 reintroduction projects, it re-colonised the Rhône river and its tributaries, including the Saône, and other river systems such as Loire, Moselle, Tarn and Seine. In 2011, the French beaver population was estimated at 14,000 individuals living along 10,500 km (6,500 mi) of watercourses.[31] In 2022, its range was estimated to have increased to 17,000 km (11,000 mi) of watercourses.[32]

In Germany, around 200 Eurasian beavers survived at the end of the 19th century in the Elbe river system in Saxony, Saxony-Anhalt and Brandenburg.[33] Official reintroduction programs, in particular in Bavaria, resulted in major population growth and beavers are now found throughout most of eastern and southern Germany, with strongly established disjunct populations in the west.[34][2] By 2019, beavers numbered above 40,000, and appear in many urban areas.[35]

In the Netherlands, beavers were completely extirpated by 1826. Due to official reintroductions since 1988, beavers are now found in most parts of the country, in particular the south, centre and north-west. [36] The population was around 3500 in 2019.[2]

In Belgium the beaver was extirpated in 1848. Today's beavers descend mostly from unofficial releases of 101 individuals in 1998–2000 to several sites, mainly in the Ardennes, and an unofficial release in the Dijle and Laan Rivers of Flanders in 2003 (all openly publicised). Other beavers have spread into Flanders from the Netherlands, also in 2003. In 2018, the population was 2200-2400, with Flanders having c. 155 territories, minimum 400 beavers and Wallonia c. 650 territories and 1800–2000 beavers.[2]

In Switzerland, the Eurasian beaver was hunted to extirpation in the early 19th century. Between 1956 and 1977, 141 individuals from France, Russia and Norway[37] were reintroduced to 30 sites in the Rhône and Rhine catchment areas. As of 2019, Switzerland had an estimated 3,500 beavers (a sharp increase from 1,600 beavers in 2008), with permanent beaver presence along most larger rivers of the Swiss plateau and the Swiss Alps (with the exception of Ticino).[38]

In Poland, as of 2014, the beaver population had grown to 100,000 individuals.[39]

In Romania, beavers became extinct in 1824, but were reintroduced in 1998 along the Olt River, spreading to other rivers in Covasna County.[40] In 2014, the animals were confirmed to have reached the Danube Delta.[41]

In Russia, by 1917, beaver populations remained in four isolated territories: in the Dnieper basin; in the Don basin; in the northern Urals and in the upper reaches of the Yenisei along the Azas river. The total number of beavers did not exceed 900 heads. Beaver hunting was banned in 1922. In 1923, a hunting reserve was organised in the Voronezh region along the Usman river, which in 1927 was transformed into the Voronezh State Reserve. At the same time, two more such reserves were created: Berezinsky and Kondo-Sosvinsky. 1927 also the first attempts to reintroduce beavers in other areas. As a result, by the end of the 1960s, the beaver's range in the Soviet Union was almost as large as in the 17th century. The beavers’ growing numbers made commercial capture possible again. In 2016, there were an estimated 661,000 beavers in Russia; in 2019, the estimate was 774,600.[42]

In the lands that made up the Soviet Union, almost 17,000 beavers were translocated from 1927 to 2004. Some 5,000 of these went to Ukraine, Belarus, the Baltic States and Kazakhstan.[21] The beaver is now common in Estonia and Latvia.[citation needed]

In Greece, the Eurasian beaver was present in the Last Glacial Period; remains have been found in Epirus.[43] Beaver remains from the Neolithic have been found in coastal Evros and Argura; from the Neolithic to Bronze Age transition period in the Ptolemaida basin and in Sitagroi; and beaver remains from the Early Helladic II have been found in northeastern Peloponnese.[44][45][46][47] In the 4th century BC, Aristotle described this species under the name λάταξ/ (latax). He wrote that it is wider than the otter, with strong teeth, and at night it often uses these teeth to cut down trees on riverbanks.[48] Ιt's not clear when beavers vanished from Kastoria (which may have been named after the beaver – κάστορας in Greek), but as late as the 18th century they were still hunted for fur.[49] Buffon wrote that they were very rare in Greece at that time.[50] In the 19th century, beavers could still be found in the Alfeios river and in Mesolongi.[51]

In Bulgaria, fossil, subfossil and subrecent remains have been found in 43 localities along 28 lowland rivers, from Struma and Maritsa in the south till the Danube in the north, while the last finds from Nicopolis ad Istrum date to the 1750–1850 period.[52][53] In 2021, the Eurasian beaver was confirmed to have returned to Bulgaria.[54]

In Serbia, beavers were mostly extinct by the 1870s, with the last specimens being seen around 1900–1902. In 2004, 31 beavers were reintroduced in the Zasavica reserve by the Biology Faculty of the Belgrade University in collaboration with the Bavarian Science Society, and 45 beavers were released in the Obedska bara reserve. They spread quickly. By 2020, they had spread 150 km (93 mi) north, west and east, inhabiting rivers in the Sava-Danube system (Drina, Jadar, Great Morava, Tamnava, Tisza, Bega, Timiș, the canal system in Vojvodina), they were found in the capital Belgrade, and had spread to neighbouring Bosnia and Herzegovina.[55][56][57]

In Italy, beavers returned in 2018 after an absence of almost 500 years, when they were spotted in the Friuli-Venezia Giulia region.[58][59]

The beaver resurgence in Eurasia has brought an increase in human-beaver encounters. In May 2013, a Belarusian fisherman who "tried to grab" a beaver died after it bit him several times, severing an artery in his leg, which caused him to bleed to death.[60]

The Nordics[edit]

In Denmark, the beaver appears to have gone extinct 2,000–2,500 years ago, though a small population might have survived into the 1st millennium AD.[61][62] In 1999, 18 beavers were reintroduced to the river Flynder in Klosterhede Plantage state forest in west-central Jutland, brought from the Elbe river in Germany.[63] At Arresø in northern Zealand, 23 beavers were reintroduced between 2009 and 2011.[64] By 2019, it was estimated that the Jutland population had increased to 240–270 individuals, and had spread far, from Hanstholm in the north to Varde and Kolding in the south. The population in northern Zealand, which had yet to significantly expand its geographic range, had increased to 50–60 individuals in 2019.[65]

In Norway, there was still a beaver population in the early 1900s, one of the few surviving in Europe at that time. Following protection, the Norwegian range of the species has expanded.[1] The surviving population was in southern Norway; beavers were reintroduced to central Norway's Ingdalselva River watershed on the Agdenes peninsula in Sør-Trøndelag in 1968–1969. The area is hilly to mountainous, with many small watersheds. Rivers are often too steep for beavers, so their habitat is scattered, and there's often only room for one territory in a habitat patch. The beavers spread slowly from watershed to watershed in the hilly terrain. Some spread could only be plausibly explained by assuming travel through sheltered sea water in fjords.[66]

In Sweden, the Eurasian beaver had been hunted to extinction around 1870.[20] Between 1922 and 1939, some 80 individuals were imported from Norway and introduced to 19 sites in Sweden. In 1995, the Swedish beaver population was estimated at 100,000.[67]

In Finland, there are some Eurasian beavers that have been re-introduced or spread from Sweden, but most of the Finnish population is a released North American beaver population. This population is controlled to prevent it from spreading into areas inhabited by the Eurasian beaver.[1]

British Isles[edit]

Beaver dam, Scotland
The same dam four months later
Beaver tracks in snow

The Eurasian beaver was well-established in Great Britain, but was driven extinct there by humans in the 16th century, with the last known historical reference in England in 1526.[68] It is unclear whether beavers ever existed in Ireland.[69] In the early 21st century, the beaver became the first mammal to be successfully reintroduced in the United Kingdom, after unofficial and official reintroductions to Scotland and England.[70]

In Scotland, free-living beaver populations occur around the River Tay and Knapdale areas. The Knapdale population, sourced from Norway, was released by the Scottish Wildlife Trust and the Royal Zoological Society of Scotland, while the other populations are of unknown origin. Sixteen beavers were released between 2009 and 2014 in Knapdale forest, Argyll. A 2009 release of three beaver families of 11 individuals was the start of the Scottish Beaver Trial, a five-year research project to assess the effects of beaver reintroduction.[71] Over the course of the trial, 16 individual beavers were released in total, with the goal of establishing four breeding pairs. 14 beaver kits were born; by the end of the trial in 2014, eight of the reintroduced beavers had survived and one or two of the wild-born beavers were estimated to be alive in the Knapdale area.[citation needed] In 2016, the Scottish government declared that the beaver populations in Knapdale and Tayside could remain and naturally expand.[70] Beaver translocations now occur throughout many catchments in Scotland.

In England, a population of unknown origin has been present on the River Otter, Devon since 2008. An additional pair was released to increase genetic diversity in 2016.[72][73] As part of a scientific study, a pair of Eurasian beaver was released in 2011 into a three-hectare fenced enclosure near Dartmoor in southern Devon. The 13 beaver ponds now in place impacted flooding to the extent of releasing precipitation over days to weeks instead of hours.[74] In 2019, a beaver pair was reintroduced in East Anglia for the first time. A four-hectare beaver enclosure on a farm in North Essex is part of a flood risk reduction project designed to reduce property flooding. The impact on flooding, wildlife and rural tourism is monitored by a private landowner.[75] In 2022, beavers were legally protected in England, "making it illegal to capture, kill, injure or disturb them."[76]

Asia[edit]

Fossils of C. fiber have been discovered in the famous Denisova Cave.[77] In Iraq, Iran, Syria, and Turkey, subfossil evidence of beavers extends down to the floodplains of the Tigris-Euphrates basin, and a carved stone stela dating between 1,000 and 800 BC in the Tell Halaf archaeological site along the Khabur River in northeastern Syria depicts a beaver.[78] Although accounts of 19th-century European visitors to the Middle East appear to confuse beavers with otters, a 20th-century report of beavers by Hans Kummerlöwe in the Ceyhan River drainage of southern Turkey includes the diagnostic red incisor teeth, flat, scaly tail, and presence of gnawed willow stems.[79]

According to the Encyclopaedia Iranica, early Iranian Avestan and Pahlavi, and later Islamic literature, all had different words for otter and beaver, and castoreum was highly valued in the region.[80] Johannes Ludwijk Schlimmer, a noted Dutch physician in 19th-century Iran, reported small numbers of beavers below the confluence of the Tigris and the Euphrates, along the bank of the Shatt al-Arab in the provinces of Shushtar and Dezful.[81] Austen Layard reported finding beavers during his visit to the Kabur River in Syria in the 1850s, but noted they were being rapidly hunted for said castoreum to extirpation.[82] Beavers were specifically sacred to Zoroastrianism (which also revered otters), and there were laws against killing these animals.[83]

In China, a few hundred beavers live in the basin of the Ulungur River near the international border with Mongolia. The Bulgan Beaver Nature Reserve (Chinese: 布尔根河河狸自然保护区; 46°12′00″N 90°45′00″E / 46.20000°N 90.75000°E / 46.20000; 90.75000) was established in 1980 to protect the creatures.[84]

Fossil record[edit]

Fossils found in the Spanish region around Atapuerca show that the Eurasian beaver was present in the Early Pleistocene but not in the Middle Pleistocene despite apparently favourable environmental conditions. It reappeared in the region during the Late Pleistocene and Holocene.[85]

Conservation[edit]

See also: Reintroduction of Beavers to Europe

The Eurasian beaver Castor fiber was once widespread in Europe and Asia but by the beginning of the 20th century both the numbers and range of the species had been drastically diminished, mainly due to hunting.[1] At this time, the global population was estimated to be around 1,200 individuals, living in eight separate sub-populations.[1] Conservation of the Eurasian Beaver began in 1923 in the USSR, with the establishment of the Voronezh Nature Reserve.[86] From 1934 to 1977, approximately 3,000 Eurasian Beavers from Voronezh were reintroduced to 52 regions of the USSR, from Poland to Mongolia.[87] In 2008, the IUCN granted the Eurasian Beaver a status of least concern, with the justification that the species had recovered sufficiently with the help of global conservation programmes.[1] Currently the largest numbers can be found across Europe, where reintroductions have been successful in 25 countries and conservation efforts are ongoing. However, populations in Asia remain small and fragmented, and are under considerable threat.[1][88]

References[edit]

  1. ^ a b c d e f g h Batbold, J.; Batsaikhan, N.; Shar, S.; Hutterer, R.; Kryštufek, B.; Yigit, N.; Mitsainas, G. & Palomo, L. (2021) [amended version of 2016 assessment]. "Castor fiber". IUCN Red List of Threatened Species. 2021: e.T4007A197499749. doi:10.2305/IUCN.UK.2021-1.RLTS.T4007A197499749.en. Retrieved 16 July 2024.
  2. ^ a b c d e f g h i Halley, Duncan; Saveljev, Alexander; Rosell, Frank (2021). "Population and distribution of beavers Castor fiber and Castor canadensis in Eurasia". Mammal Review. 51: 1–24. Retrieved 16 July 2024.
  3. ^ a b c d e Kitchener, A. (2001). Beavers. Essex: Whittet Books. ISBN 978-1-873580-55-4.
  4. ^ Linnaeus, C. (1758). "Castor fiber". Caroli Linnæi Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Vol. Tomus I (decima, reformata ed.). Holmiae: Laurentius Salvius. pp. 58–59. (in Latin)
  5. ^ Wozencraft, W. C. (2005). "Species Castor fiber". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 532–628. ISBN 978-0-8018-8221-0. OCLC 62265494.
  6. ^ Kerr, R. (1792). "Beaver Castor". The Animal Kingdom or zoological system of the celebrated Sir Charles Linnaeus. Class I. Mammalia. Edinburgh & London: A. Strahan & T. Cadell. p. 221−224.
  7. ^ Bechstein, J. M. (1801). "Der gemeine Biber". Gemeinnützige Naturgeschichte Deutschlands nach allen drey Reichen. Vol. 2. Leipzig: Siegfried Lebrecht Crusius. p. 910−928.
  8. ^ a b Milishnikov, A. N. & Savel'Ev, A. P. (2001). "Genetic Divergence and Similarity of Introduced Populations of European Beaver (Castor fiber L., 1758) from Kirov and Novosibirsk Oblasts of Russia". Russian Journal of Genetics. 37 (1): 1022–7954. doi:10.1023/A:1009039113581. S2CID 22546899.
  9. ^ Halley, D. J. (2010). "Sourcing Eurasian beaver Castor fiber stock for reintroductions in Great Britain and Western Europe". Mammal Review. 41: 1–14. doi:10.1111/j.1365-2907.2010.00167.x.
  10. ^ Durka, W.; Babik, W.; Stubbe, M.; Heidecke, D.; Samjaa, R.; Saveljev, A.P.; Stubbe, A.; Ulevicius, A. & Stubbe, M. (2005). "Mitochondrial phylogeography of the Eurasian beaver Castor fiber L.". Molecular Ecology. 14 (12): 3843–3856. Bibcode:2005MolEc..14.3843D. doi:10.1111/j.1365-294X.2005.02704.x. hdl:11250/2438022. PMID 16202100. S2CID 13772520.
  11. ^ a b DuCroz, J.-F.; Stubbe, M.; Saveljev, A. P.; Heidecke, D.; Samjaa, R.; Ulevicius, A.; Stubbe, A. & Durka, W. (2005). "Genetic variation and population structure of the Eurasian beaver Castor fiber in Eastern Europe and Asia". Journal of Mammalogy. 86 (6): 1059–1067. doi:10.1644/1545-1542(2005)86[1059:GVAPSO]2.0.CO;2.
  12. ^ Rosell, F.; Steifetten, Ø. (2004). "Subspecies discrimination in the Scandinavian beaver (Castor fiber): combining behavioral and chemical evidence" (PDF). Canadian Journal of Zoology. 82 (6): 902–909. doi:10.1139/Z04-047. hdl:11250/2438047.
  13. ^ Rosell, F.; Thomsen, L. R. (2006). "Sexual dimorphism in territorial scent marking by adult Eurasian beavers (Castor fiber)". Journal of Chemical Ecology. 32 (6): 1301–1315. Bibcode:2006JCEco..32.1301R. doi:10.1007/s10886-006-9087-y. hdl:11250/2438052. PMID 16770720. S2CID 27218192.
  14. ^ Graf, P. M.; Wilson, R. P.; Qasem, L.; Hackländer, K.; Rosell, F. (2015). "The use of acceleration to code for animal behaviours; a case study in free-ranging Eurasian beavers Castor fiber". PLOS ONE. 10 (8): e0136751. Bibcode:2015PLoSO..1036751G. doi:10.1371/journal.pone.0136751. PMC 4552556. PMID 26317623.
  15. ^ Burnie, D.; Wilson, D. E. (2005). "Eurasian beaver". The Definitive Visual Guide to the World's Wildlife. London: Dorling Kindersley Ltd. p. 122. ISBN 0789477645.
  16. ^ Cite error: The named reference Gurnell was invoked but never defined (see the help page).
  17. ^ Ciechanowski, M.; Kubic, W.; Rynkiewicz, A. & Zwolicki, A. (2011). "Reintroduction of beavers Castor fiber may improve habitat quality for vespertilionid bats foraging in small river valleys" (PDF). European Journal of Wildlife Research. 57 (4): 737–747. doi:10.1007/s10344-010-0481-y. S2CID 23050075.
  18. ^ Müller-Schwarze, D. & Lixing Sun (2003). The Beaver: Natural History of a Wetlands Engineer. Cornell University Press. p. 80. ISBN 978-0-8014-4098-4. Retrieved 25 June 2011.
  19. ^ "Eurasian Beaver". Boreal forest. Retrieved 1 June 2020.
  20. ^ a b Salvesen, S. (1928). "The Beaver in Norway". Journal of Mammalogy. 9 (2): 99–104. doi:10.2307/1373424. JSTOR 1373424.
  21. ^ a b Halley, Duncan; Rosell, Frank; Saveljev, Alexander (2012). "Population and distribution of Eurasian Beaver (Castor fiber)". Baltic Forestry. 18: 168–175. Retrieved 16 July 2024.
  22. ^ Nolet, B. A.; Rosell, F. (1998). "Come back of the beaver Castor fiber: an overview of old and new conservation problems". Biological Conservation. 83 (2): 165–173. Bibcode:1998BCons..83..165N. CiteSeerX 10.1.1.503.6375. doi:10.1016/s0006-3207(97)00066-9.
  23. ^ Komarov, S. (15 October 2004). "Why Beavers Survived in the 19th Century". Innovations Report. Retrieved 8 September 2010.
  24. ^ Milishnikov, A. N. (2004). "Population-Genetic Structure of Beaver (Castor fiber L., 1758) Communities and Estimation of Effective Reproductive Size Ne of an Elementary Population". Russian Journal of Genetics. 40 (7): 772–781. doi:10.1023/B:RUGE.0000036527.85290.90. S2CID 23628374.
  25. ^ Wróbel, Michał (September 2020). "Population of Eurasian beaver (Castor fiber) in Europe". Global Ecology and Communication. 23.
  26. ^ Cite error: The named reference IUCN was invoked but never defined (see the help page).
  27. ^ Sanz, Benjamin (2020). "El castor europeo en el municipio de Zaragoza. Incidencia en los sotos ribereños del Ebro" (PDF). Galemys: Boletín informativo de la Sociedad Española para la conservación y estudio de los mamíferos. 32 (1): 72–76. Retrieved 16 July 2024.
  28. ^ Soria, El Día de (14 January 2022). "El castor europeo regresa a las aguas del Duero soriano". Eldiadesoria.es. Retrieved 10 June 2022.
  29. ^ "Castor Europe's (Castor Fiber)". Portugal Selvagem. 2 December 2014. Retrieved 17 July 2024.
  30. ^ "Investigadores descobrem surpreendente registo de castores a 5 quilómetros de Portugal". Wilder_Mag. 3 March 2023. Retrieved 16 July 2024.
  31. ^ Dewas, M.; Herr, J.; Schley, L.; Angst, C.; Manet, B.; Landry, P.; Catusse, M. (2012). "Recovery and status of native and introduced beavers Castor fiber and Castor canadensis in France and neighbouring countries". Mammal Review. 42 (2): 144–165. doi:10.1111/j.1365-2907.2011.00196.x.
  32. ^ "Castor d'Europe (Castor fiber)". Office Francais De La Biodiversité: Portail Technique. September 2022. Retrieved 16 July 2024.
  33. ^ Dolch, D.; Heidecke, D.; Teubner, J.; Teubner J. (2002). "Der Biber im Land Brandenburg". Naturschutz und Landschaftspflege in Brandenburg. 11 (4): 220–234.
  34. ^ Spörrle, M. (2016). "Biber in Deutschland: Die Rache der Biber". Die Zeit. Retrieved 18 January 2017.
  35. ^ "Verbreitung in Deutschland". CSFC.ch. Bund Naturschutz. 2019. Retrieved 17 July 2024.
  36. ^ "Verspreidingsatlas". 2024. Retrieved 18 July 2024.
  37. ^ Minnig, S.; Angst, C.; Jacob, G. (2016). "Genetic monitoring of Eurasian beaver (Castor fiber) in Switzerland and implications for the management of the species". Russian Journal of Theriology. 15 (1): 20–27. doi:10.15298/rusjtheriol.15.1.04.
  38. ^ "Aktuelle Verbreitung". CSFC.ch. Schweizerisches Zentrum für die Kartografie der Fau-na (SZKF / CSCF). 2019. Retrieved 7 January 2022.
  39. ^ "Bobrów jest w Polsce ponad 100 tys. Czy jeszcze trzeba je chronić?". Strefaagro.pomorska.pl. 2016.
  40. ^ "Dispăruți de la 1824: Castorii repopulează apele din Covasna". Evenimentul Zilei. Archived from the original on 5 February 2009. Retrieved 3 February 2008.
  41. ^ "Castorul a revenit în Delta Dunării, după 200 de ani de la dispariție". România Liberă. Retrieved 5 June 2014.
  42. ^ "Ученые назвали причины роста численности бобров в России | Ветеринария и жизнь" (in Russian). Retrieved 3 December 2022.
  43. ^ Gamble, C. 1999: Faunal exploitation at Klithi: a Late Glacial rockshelter in Epirus, Northwestern Greece. THE PALAEOLITHIC ARCHAEOLOGY OF GREECE AND ADJACENT AREAS: Proceedings of the ICOPAG Conference, Ioannina, September 1994.
  44. ^ Renfrew, C., Gimbutas, M. & E. Elster 1986: EXCAVATIONS AT SITAGROI VOL. 1: A PREHISTORIC VILLAGE IN NORTHEAST GREECE VOLUME 1. Monumenta Archaeologica 13.
  45. ^ Curci, A. & A. Tagliacozzo 2003: Economic and ecological evidence from the vertebrate remains of the Neolithic site of Makri (Thrace-Greece).ZOOARCHAEOLOGY IN GREECE: RECENT ADVANCES 9: 123–131.
  46. ^ Greenfield, H.J. & K. Fowler 2003:Megalo Nisi Galanis and the Secondary Products Revolution in Macedonia. ZOOARCHAEOLOGY IN GREECE: RECENT ADVANCES 9: 133–143.
  47. ^ Reese, D.S. 2013: FAUNAL REMAINS FROM EARLY HELLADIC II LERNA (ARGOLID GREECE). Mediterranean Archaeology and Archaeometry 13(1): 289–320.
  48. ^ Αριστοτέλης 4th century BC: Των περί τα ζώα ιστοριών.
  49. ^ "Περιοχη Καστοριασ". Ankas.gr.
  50. ^ Leclerc, G.L. 1798: Histoire naturelle, générale et particulière. 25.
  51. ^ Sidiropoulos, K.; Polymeni, R. M.; Legakis, A. (2016). "The evolution of Greek fauna since classical times". The Historical Review/La Revue Historique. 13: 127–146. doi:10.12681/hr.11559.
  52. ^ Boev, Z. & N. Spassov 2019: Past distribution of Castor fiber in Bulgaria: fossil, subfossil and historical records (Rodentia: Castoridae). Lynx 50: 37–49.
  53. ^ Poulter, A. 2007: Nicopolis ad Istrum: A late Roman and early Byzantine City the Finds and Biological Remains.
  54. ^ Natchev, N.; Nedyalkov, N.; Kaschieva, M.; Koynova, T. (2021). "They are back: Notes on the presence and the life activities of the Eurasian Beaver from the territory of Bulgaria" (PDF). Ecologia Balkanica. 13: 173–175.
  55. ^ "SPECIAL NATURE RESERVE ZASAVICA". 5 April 2007. Archived from the original on 5 April 2007. Retrieved 6 March 2022.
  56. ^ Branka Vasiljević (6 August 2020). "Povratak dabra posle više od sto godina" [Beaver returns after 100 years]. Politika (in Serbian). p. 15.
  57. ^ Jelenko Slatinac (17 August 2012), "Dabrovi osvajaju nova staništa" [Beavers conquer new habitats], Politika (in Serbian)
  58. ^ Liva, Gianluca (1 December 2018). "Il castoro è tornato in Italia". Oggiscienza.it. Retrieved 6 March 2022.
  59. ^ MSN report
  60. ^ "Beaver Kills Man in Belarus". The Guardian. Associated Press. 2013. Retrieved 31 May 2013.
  61. ^ "Bæver" (PDF) (in Danish). Naturstyrelsen, Danish Ministry of Environment. 2011. Retrieved 26 January 2023.
  62. ^ Brandt, L.Ø; et al. (2022). "Palaeoproteomics identifies beaver fur in Danish high-status Viking Age burials – direct evidence of fur trade". PLOS ONE. 17 (7): e0270040. Bibcode:2022PLoSO..1770040B. doi:10.1371/journal.pone.0270040. PMC 9328512. PMID 35895633.
  63. ^ Elmeros, M.; Madsen, A. B.; Berthelsen, J. P. (2003). "Monitoring of reintroduced beavers (Castor fiber) in Denmark" (PDF). Lutra. 46 (2): 153–162.
  64. ^ Vilstrup, A. (2014). Assessment of the newly introduced beavers (Castor fiber) in Denmark and their habitat demands (PDF) (MSc thesis). Lund: Department of Biology, Lund University.
  65. ^ "I 2500 år var bæveren uddød i Danmark – nu deler den for alvor vandene" (in Danish). TV2. 22 May 2021.
  66. ^ Halley, D. J.; Teurlings, I.; Welsh, H. & Taylor, C. (2013). "Distribution and patterns of spread of recolonising Eurasian beavers (Castor fiber Linnaeus 1758) in fragmented habitat, Agdenes Peninsula, Norway". Fauna Norvegica. 32: 1–12. doi:10.5324/fn.v32i0.1438. hdl:11250/3078870.
  67. ^ Busher, Peter E., ed. (1999). Beaver protection, management, and utilization in Europe and North America. New York: Kluwer Academic/Plenum Publ. p. 2. ISBN 978-0-306-46121-7.
  68. ^ Martin, H. T. (1892). Castorologia: Or The History and Traditions of the Canadian Beaver. W. Drysdale. p. 26. ISBN 978-0-665-07939-9.
  69. ^ Pádraic Fogarty (2020). "The Case for Beavers in Ireland". Ireland Wildlife Trust. Retrieved 17 July 2024.
  70. ^ a b "More beavers reintroduced to Knapdale Forest". BBC News. 2017. Retrieved 26 December 2018.
  71. ^ Ward, Kim J; Prior, Jonathan (2020). "The Reintroduction of Beavers to Scotland: Rewilding, Biopolitics, and the Affordance of Non-human Autonomy". Conservation & Society. 18 (2): 103–113. doi:10.4103/cs.cs_19_63. hdl:10026.1/15593. ISSN 0972-4923. JSTOR 26937285. S2CID 219585838.
  72. ^ "Beaver spotted in Devon's River Otter by dog walker". BBC News. 2013. Retrieved 26 December 2018.
  73. ^ Aldred, J. (2014). "Wild beaver kits born in Devon". The Guardian. Retrieved 26 December 2018.
  74. ^ Lawton, G. (2018). "The secret site in England where beavers control the landscape". New Scientist. Retrieved 26 December 2018.
  75. ^ "Natural Flood Management Beavers – Spains Hall Estate". spainshallestate.co.uk. Retrieved 23 September 2019.
  76. ^ "Eurasian Beaver now legally protected in England". BBC News. 30 September 2022. Retrieved 6 January 2023.
  77. ^ Puzachenko, A. Yu.; Titov, V. V.; Kosintsev, P. A. (20 December 2021). "Evolution of the European regional large mammals assemblages in the end of the Middle Pleistocene – The first half of the Late Pleistocene (MIS 6–MIS 4)". Quaternary International. 605–606: 155–191. Bibcode:2021QuInt.605..155P. doi:10.1016/j.quaint.2020.08.038. Retrieved 13 January 2024 – via Elsevier Science Direct.
  78. ^ Legge, A. J.; Rowley-Conwy, P. A. (1986). "The Beaver (Castor fiber L.) in the Tigris-Euphrates Basin". Journal of Archaeological Science. 13 (5): 469–476. Bibcode:1986JArSc..13..469L. doi:10.1016/0305-4403(86)90016-6.
  79. ^ Kumerloeve, H. (1967). "Zur Verbreitung kleinasiatischer Raub- und Huftiere sowie einiger Grossnager". Säugetierkundliche Mitteilungen. 15 (4): 337–409.
  80. ^ A'lam, Hūšang (1989). "Beaver". Encyclopaedia Iranica. Vol. IV(1). New York: Columbia University. pp. 71–74. Retrieved 7 August 2015.
  81. ^ Schlimmer, J. L. (1874). Terminologie médico-pharmaceutique et anthropologique Française-Persane. Tehran, Iran: Lithographie d'Ali Gouli Khan. p. 115. ISBN 9781275998582. Retrieved 7 August 2015.
  82. ^ Layard, A. H. (1853). Discoveries in the Ruins of Nineveh and Babylon. London, England: John Murray, Albemarle Street. p. 252. ISBN 9781275998582. Retrieved 11 August 2017.
  83. ^ Richard Foltz (2010). "Zoroastrian Attitudes toward Animals" (PDF). Society and Animals 18: 367–378. Retrieved 6 March 2022.
  84. ^ Chua, H.; Jianga, Z. (2009). "Distribution and conservation of the Sino-Mongolian beaver Castor fiber birulai in China". Oryx. 43 (2): 197–202. doi:10.1017/s0030605308002056.
  85. ^ Cuenca-Bescós, G.; Rosell Ardévol, J.; Morcillo-Amo, Á.; Galindo-Pellicena, M.Á.; Santos, E.; Costa, R.M. (2017). "Beavers (Castoridae, Rodentia, Mammalia) from the Quaternary sites of the Sierra de Atapuerca, in Burgos, Spain". Quaternary International. 433: 263–277. Bibcode:2017QuInt.433..263C. doi:10.1016/j.quaint.2015.10.072.
  86. ^ "Climate and Location". zapovednik-vrn.ru (official website of the Voronezhsky Nature Reserve). Retrieved 3 December 2022.
  87. ^ Romashova, Natalya B. (2016). "History of conservation and research activities of the Eurasian beaver (Castor fiber) in the Voronezhsky Nature Reserve" (PDF). Russian Journal of Theriology. 15: 8–19. doi:10.15298/rusjtheriol.15.1.03.
  88. ^ "Scottish Beaver Frequently Asked Questions". scottishbeavers.org.uk. Retrieved 14 April 2017.

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