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Vol 67-Uus.Indd Forestry Studies | Metsanduslikud Uurimused, Vol. 67, Pages 109–115 Population density of the Eurasian beaver (Castor fi ber L.) (Castoridae, Rodentia) in the Middle Volga of Russia Alexey Andreychev Andreychev, A. 2017. Population density of the Eurasian beaver (Castor fi ber L.) (Cas- toridae, Rodentia) in the Middle Volga of Russia. – Forestry Studies | Metsandusli- kud Uurimused 67, 109–115. ISSN 1406-9954. Journal homepage: http://mi.emu.ee/ forestry.studies Abstract. The article presents research on the population density of the Eurasian beaver in the large, medium and small rivers of the Republic of Mordovia. The population density of the beaver in the large rivers of the region varies from 0.45 to 0.62 colonies per km (average 0.52). The population density in medium rivers ranges from 0.36 to 0.48 colonies per km (average 0.4). In small rivers, population density ranges from 0.2 to 0.94 colonies per km (average 0.46). The total number of beavers in the region is about 17,000 individuals as at 2016. Key words: Eurasian beaver, Castor fi ber, density population, colonies, European Russia, Mordovia. Author’s address: Department of Zoology, Mordovian State University, Bolshevist- skaya str. 68, 430005, Saransk, Republic of Mordovia, Russia; e-mail: andreychev1@ rambler.ru on re-acclimatisation. In total, 34 beavers Introduction were released. The Eurasian beaver was imported from the Voronezh Game Re- Currently, the populations of the Eurasian serve. The release into the wild was carried beaver (Castor fi ber L.) are being restored or out in small batches. The beavers were re- will be restored in many regions in Russia. leased into forest lakes, such as the Picher- However, scientists in different countries ki, the Taratinskoe, the Kocheulovo, and need to ascertain population density in dif- the Inorki. As a result, the beaver popu- ferent parts of the area (Halley & Rosell, lation has increased rapidly. The beavers 2003). Beavers undoubtedly affect many from the lakes spread throughout the riv- ecosystems and knowing the state of their ers – the Pushta, the Uzhovka, the Satis, populations is an important task (John- and the Yuzga. By 1950, the number of the ston & Naiman, 1990; Rosell et al., 2005). In growing population was estimated at 300 2009–2010, there were 572,500 individuals individuals. In 1956, 40 beaver individu- of the Eurasian beaver in the territory of als from the Mordovian reserve were re- Russia (Kolesnikov et al., 2011). leased in the Zubovo-Polyansky District to In Mordovia, river beavers were re- accelerate settlement in the Vad River. In leased in the Mordovia State Nature Re- 1959, there were 600 beavers and in 1964, serve by zoological expedition S.S. Turov. about 1,000 individuals (Borodina, 1966; This was carried out from 1936 until 1940 Borodina et al., 1970) in the Moksha river within the framework of the programme basin. Since 1961, beavers’ dwellings have DOI: 10.1515/fsmu-2017-0016 © 2017 Estonian University of Life Sciences. All rights reserved 109 A. Andreychev been built (Borodin, 1970; Andreychev & 37 °C. The average annual precipitation in Kuznetsov, 2012) in the Sura river basin. the territory of Mordovia is 480 mm. Over Until the end of the 20th century, bea- the course of observation lasting many vers in the region were hunted in all possi- years, periods of more and less humidifi ca- ble ways. As a result, they became extinct. tion were noted, ranging between the min- Beaver traps have been prohibited since imum and maximum values of 120–180 2005 when they were included in the Red mm. Distribution of precipitation across Book of the region. For a long time, sci- the territory is not very diverse. The aver- entifi c literature included no information age long-term value of evaporation is cal- on the number of beavers in the region. A culated to be in the range of 390–460 mm. small resurgence in beaver trapping has According to the research of botanists, occurred recently. The aim of this work is there are more than 1,230 species of vascu- to determine the density of the Eurasian lar plants from 495 genera and 109 families beaver population in different rivers in one in the modern fl ora of Mordovia. These of the central regions of Russia. include 4 species of plains, 8 horsetails, 18 ferns, 3 gymnosperms, and 1,197 species of fl owering plants. Herbaceous perennial Material and Methods and annual plants predominate. The num- ber of species of woody forms is relatively The Republic of Mordovia is located in the small: trees – 24, shrubs – 45, shrubs – 7, centre of the European part of Russia. Its semishrubs – 5. extreme points are defi ned by geographi- The territory of Mordovia includes cal coordinates 42º 11’ – 46º 45’ E and 53º coniferous broad-leaf, broad-leaf forests, 38’ – 55º 11’ N (Figure 1). The maximum shrub steppes and meadow steppes. The distance from west to east is 298 km and main forest forming species are the Scots the distance from north to south is 57 to pine (Pinus sylvestris L.), Norway spruce 140 km. The area of the republic is 26.2 (Picea abies (L.) Karst), European larch (Lar- thousand km2. Features of the geological ix decidua Mill.), English oak (Quercus ro- structure of Mordovia are determined by bur L.), common ash (Fraxinus excelsior L.), its location in the central part of the Rus- Norway maple (Acer platanoides L.), Scots sian Platform and the north-western slopes elm (Ulmus laevis Pall.), silver and pubes- of the Volga Upland. In the western part of cent birch (Betula pendula Roth., B. pubes- the Republic of Mordovia, the Volga Up- cens Ehrh.), black alder (Alnus glutinosa L.), land reaches the Oka-Don Lowlands. small-leaved lime (Tilia cordata Mill.) and The climate of the region is moderate- black poplar (Populus nigra L.). ly continental with pronounced seasons Coniferous broad-leaf or mixed forests throughout the year. The infl ux of direct are located in the outwash plains and ad- solar radiation in Mordovia varies from 5.0 jacent terraced complexes. These include in December to 58.6 kJ/cm2 in June. Total both coniferous and broad-leaved trees. In radiation throughout the year is 363.8 kJ/ the sands of the outwash plains, the most cm2; the radiation balance is 92.1 kJ/cm2. common are pine forests, often with some The average annual air temperature varies characteristics of a taiga. Broad-leaved for- from 3.5 to 4.0 °C. The average tempera- ests are prevalent mainly in interfl uvial ture of the coldest month (January) is in spaces of secondary morainic and erosion- the range of –11.5...–12.3 °C. Temperature denudation plains with grey forest soils as drops down to –47 °C occur. The average well as in fl oodplain complexes. temperature of the warmest month, i.e. Mordovia is located in the south-west- July, is in the range of +18.9...+19.8 °C. Ex- ern part of the Volga River basin. 47% of treme temperatures in the summer reach the area is located in the basin of Sura and 110 Population density of the Eurasian beaver (Castor fi ber L.) (Castoridae, Rodentia) in the Middle Volga of Russia Figure 1. Geographical position of the Republic of Mordovia in Eastern Europe. 111 A. Andreychev 53% in the basin of Moksha. Moksha is the all rivers. Small rivers make up 4% of the main river in western Mordovia that fl ows total and 22% of the length of all rivers. in the meridional direction to the confl u- The share of medium-sized rivers (the Issa, ence of the Urkat River, where its direction the Sivin, the Insar, the Partsa, the Vad, the changes to the sublatitudinal. The Mok- Visha, and the Alatyr) in the total length is sha is the right tributary of the Oka River negligible (0.5%). Two rivers – the Moksha and empties into it. The channel is 60–90 and the Sura – are more than 500 km long m wide and 5–8 m deep. The absolute wa- (Water resources…, 1999). Small rivers and ter level is 89–126 m. The Moksha’s largest streams are distributed unevenly in the ba- tributaries in the territory of Mordovia are sins of large rivers. In the river Sura, there the Vad, the Satis, the Urkat, the Sivin, and are 24 small rivers and 286 very small riv- the Issa. ers and streams. 30 small rivers and 385 The Sura River fl ows along the south- very small rivers and streams fl ow into the eastern border of Mordovia. The width of Moksha River. the channel varies from 100 to 150 m and It is typical for small rivers to have a 5 its depth is 10 m. It fl ows 0.3–1.0 m/s and to 10 m wide channel, with extensions up its absolute water level is 90–115 m. The to 35 m; for average rivers, from 25 to 50 largest tributaries of the Sura include the m with extensions up to 70 m. Large rivers Bolshaya Ksha, the Bolshaya Sarka, the Pi- are 100 to 150 m wide and in the mouths, ana, the Menya, and the Alatyr. 300 m. Rivers are shallow and the prevail- The density of the river network in the ing depths for small rivers is 0.4 to 1.2 m, entire area is 0.23 km of river per km2. By for average ones 1.5 to 2.0, and for large the nature of intra-fl ow distribution, the ones 2.5 to 3.5 m.
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