Academy of science of Mongolia

Ulaanbaatar, Mongolia

Academy of science of Mongolia

Ulaanbaatar, Mongolia
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Bazarova B.B.,Russian Academy of Sciences | Itigilova M.T.,Russian Academy of Sciences | Dulmaa A.,Academy of science of Mongolia | Matafonov P.V.,Russian Academy of Sciences | And 4 more authors.
Biology Bulletin | Year: 2017

The diversity of communities and the quantitative parameters of hydrobionts of 17 lakes of the Onon-Toreisk Plain in Northeastern Mongolia during the low-water period are analyzed. The organisms revealed in the lakes include 35 species of phytoplankton, 35 species of zoobenthos, 31 species of zooplankton, and 14 species of hydrophytes. Chara virgata, a representative of charophytes, was revealed in Mongolia for the first time. The greatest species diversity of the communities of hydrobionts is seen in oligohaline lakes. The highest quantitative parameters of communities of phytoplankton and zoobenthos are typical for Gurmiin Lake. © 2017, Pleiades Publishing, Inc.

Gunin P.D.,RAS Severtsov Institute of Ecology | Bazha S.N.,RAS Severtsov Institute of Ecology | Danzhalova E.V.,RAS Severtsov Institute of Ecology | Drobyshev Y.I.,RAS Severtsov Institute of Ecology | And 10 more authors.
Arid Ecosystems | Year: 2015

The article describes the regional features of ecosystem desertification in the southern periphery of the Baikal basin that are located in the zone of cross-border interaction between the southern Siberian and the Central Asian internal drainage basin landscapes. The nature of such interactions is identified as invasive, which is associated with the penetration of desert-steppe plant species: Caragana bungei are found in larch forests, and Allium polyrrhizum are found in dry steppes. A high degree of species adaptation to the modern arid climate is defined by ecological and physiological analysis of these species characteristics. The significant predominance of Caragana bungei and Allium polyrrhizum in the current structure of plant communities makes it possible to identify a long-term and widespread invasive succession and to characterize this process as a specific desertification form. © 2015, Pleiades Publishing, Ltd.

Seminsky K.Z.,Russian Academy of Sciences | Demberel S.,Academy of Science of Mongolia | Mungunsuren D.,Academy of Science of Mongolia
Doklady Earth Sciences | Year: 2017

The seismic and emanation activity of fault zones at a geodynamic test site arranged in the vicinity of Ulaanbaatar to investigate dangerous geological processes in a heavily populated area of Mongolia is analyzed. It has been found that, at the modern stage of tectogenesis, destruction of the Earth’s crust occurs in the area of the strike-slip fault transformed from the Indo-Asian collision zone. Thus, a network of fault zones with seismic and emanation activity is developed in this area. In the vicinity of Ulaanbaatar, there are four systems of fault zones. The spatial pattern of the systems shows a nodal junction of comparatively large rightlateral and left-lateral strike-slip faults of submeridional and sublatitudinal orientation. These strike-slips are barely connected with a network of ancient faults. The northwestern and northeastern zones developed by compression and tension, on the contrary, inherit disjunctive structures of the most recent age located in a nodal junction at the tops of dihedral angles. Determination of the pattern of recent faulting is essential to estimate the seismic hazard for the capital of Mongolia, where more than one-third of the nation lives. © 2017, Pleiades Publishing, Ltd.

Bazha S.N.,RAS Severtsov Institute of Ecology | Gunin P.D.,RAS Severtsov Institute of Ecology | Danzhalova E.V.,RAS Severtsov Institute of Ecology | Drobyshev Y.I.,RAS Severtsov Institute of Ecology | And 5 more authors.
Russian Journal of Biological Invasions | Year: 2015

The studies of the steppe ecosystems in Central Mongolia have showed that the simplification of steppe communities has taken place over recent decades. This occurred by reduction of species diversity and abundance of indigenous dominants—tussock grasses—as a result of sharp rise in pasture loads and a long dry period. We have identified two types of introduction of invasive species from different landscapes: (a) extraand intrazonal and (b) zonal. The first type of succession is characterized by focal distribution of Ephedra sinica from ecosystems of low mountains to the surrounding mountain plains. The second type of succession in dry steppes is associated with the expansion of Allium polyrrhizum, whose distribution has largely a frontal character and is caused by weakening of the competitiveness of indigenous species of grass communities because of their significant digression. A further factor in ensuring the conditions for invasion is the aeolian alkalization of the upper horizons of zonal chestnut soils. The ecological and biological features of these two species, widespread in the desert-steppe and desert landscapes and penetrating into the steppe ecosystems, make it possible to speak about biological desertification. The wide area of Ephedra sinica and Allium polyrrhizum indicates a progressive character of the studied types of succession, and as a result of this, the borders of these areas have reached at present the southern periphery of the Baikal Lake basin. The paper describes the processes which lead to the reduction of the fodder value of pastures and jeopardize the maintenance of cattle breeding in Central Mongolia. © 2015, Pleiades Publishing, Ltd.

Ariunchimeg Y.,Academy of science of Mongolia
Paleontological Journal | Year: 2010

The taxonomic diversity and distribution of the Upper Ordovician bryozoans of Mongolia are analyzed. Five heterochronous assemblages of bryozoans are established: Chigertei and Tsagaan del in the Sandbian Stage and Bairim Ovoo, Uuregnur, and Sairin in the Katian Stage. The bryozoans are shown to be important for solving complex problems of stratigraphy of the Ordovician of Mongolia and for paleogeographic reconstructions. © Pleiades Publishing, Ltd., 2009.

Semerikov V.L.,Russian Academy of Sciences | Semerikova S.A.,Russian Academy of Sciences | Dymshakova O.S.,Russian Academy of Sciences | Zatsepina K.G.,Russian Academy of Sciences | And 7 more authors.
Russian Journal of Genetics | Year: 2014

The variability of four microsatellite loci of chloroplast DNA was studied in 38 populations of Pinus sylvestris in the European part of Russia, in Siberia, Kazakhstan, Transbaikalia and Mongolia. High variability was observed in all regions. In total, 152 haplotypes were identified. The level of population differentiation R ST was 2.1%. The differentiation of three geographical groups of populations (European, Siberian-Kazakhstan and Transbaikalian-Mongolian) was insignificant (R CT = 0.004). At the same time, some rare haplotypes were found to be specific for a certain geographical region. Distribution of the rare haplotypes, which differentiated European populations from Asian populations and Mongolian and Transbaikalian populations from the Siberian, showed the independence of the history of these regions. This corresponds more to the hypothesis that the modern area of Pinus sylvestris originated via settlement from many origins than to the hypothesized single center of the post-glacial recolonization. The distribution of the pairwise differences between the individual specimens corresponded to the model of sudden population growth. The assessments of the age of this event for Pinus sylvestris (4.5-4.7 million years), which were obtained on the basis of this model, significantly exceeded the age of the Quaternary. Therefore, the revealed population growth is hardly due to the changes in flora related with the glaciation, but rather mirrors the moment of the species formation. © 2014 Pleiades Publishing, Inc.

Kozakov I.K.,Russian Academy of Sciences | Kirnozova T.I.,RAS Institute of Chemistry | Kovach V.P.,Russian Academy of Sciences | Terent'eva L.B.,Russian Academy of Sciences | And 3 more authors.
Stratigraphy and Geological Correlation | Year: 2015

The Dzabkhan microcontinent was earlier considered as a fragment of an ancient craton in the structure of the Central Asian Orogenic Belt. Deposits of the Tsagaan Oloom Formation were included in the shelf zone, under the assumption that they were related to the regional unconformity between the Early-Late Precambrian crystal formations. The carbonate sequence of the Tsagaan Oloom Formation overlaps crystalline rocks only in the eastern part of the Dzabkhan microcontinent, where dolomites lie unconformably on high-grade metamorphic rocks intruded by granitoids of the Bogdyngol massif. The latter were included in the composition of both the Early Precambrian basement and the Middle Riphean intrusive complex. We have determined the U-Pb zircon age of these granitoids at 717 ± 5 Ma and the Nd model ages of granitoids and gneisses of the basement of the Tsagaan Oloom Formation at 2.0–1.9 Ga at εNd = −10.0..−6.6. Recent geochronological and Nd and Pb-Pb isotopic and geochemical data indicate that intrusive and high-grade metamorphic complexes are absent in the crystalline basement of the Dzabkhan microcontinent, similar to those in ancient cratons. One can assume that the Late Riphean carbonate cover (Tsagaan Oloom Formation) deposited on the Late Precambrian continental block. © 2015, Pleiades Publishing, Ltd.

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