bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation of Tychonema sp. tropism to the sponge body in the experiment of co-cultivation of cyanobacteria with primmorphs
Authors: Naidanova Y.A. ,   Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya, 3, Irkutsk, 664033, Russia, Sorokovikova E.G. ,   Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya, 3, Irkutsk, 664033, Russia, Tikhonova I.V. ,   Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya, 3, Irkutsk, 664033, Russia, Khanaev I.V. ,   Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya, 3, Irkutsk, 664033, Russia, Belykh O.I. ,   Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya, 3, Irkutsk, 664033, Russia
Published: September 2024

Mass death of endemic sponges accompanied by the growth of cyanobacterial biofilms on their bodies has been registered in recent years in Lake Baikal. These biofilms are formed by the cyanobacterium Tychonema sp., which grows on various types of substrates in the littoral zone and is often found on sponges. The aim of the study was to conduct an experiment on co-cultivation of Tychonema sp. with Baikalospongia sp. primomorphs to test the hypothesis about the tropism of Baikal cyanobacterium to the body of sponges. In the experiment, gradual fouling of the primmorphs with cyanobacterium filaments, destruction of their structure and death of sponge cells were registered. In the control without addition of cyanobacteria, the primmorphs remained alive during the whole time of the experiment.
Molecular-genetic features of ascomycetous yeast Kluyveromyces from aquatic ecosystems
Authors: Naumova E.S. ,   National Research Center “Kurchatov Institute”, Moscow, 123098 Russia, Tuaeva A.Yu. ,   National Research Center “Kurchatov Institute”, Moscow, 123098 Russia, Lyutova L.V. ,   National Research Center “Kurchatov Institute”, Moscow, 123098 Russia
Published: September 2024

Using genetic hybridization and phylogenetic analyses, the genetic relationship of terrestrial and aquatic species of the ascomycetous yeast genus Kluyveromyces was investigated. The results obtained allow us to conclude that aquatic (K. aestuarii, K. nonfermentans, and K. siamensis) and terrestrial (K. lactis, K. marxianus, K. dobzhanskii, K. starmeri, K. wickerhamii) species belong to different genetic genera.
Antagonistic properties of actinomycetes in bottom sediments of a Mongolian river
Authors: Norovsuren J. ,   The Institute of Biology, Mongolian Academy of Sciences, Mongolia, Dorjgotov D. ,   Institute of Geography and Geoecology, Mongolian Academy of Sciences, Mongolia, Lipko I.A. ,   Limnological Institute SB RAS, Irkutsk, Russia, Burmaa Z. ,   Western regional branch of National University of Mongolia, Mongolia, Bolormaa Ts. ,   Institute of Geography and Geoecology, Mongolian Academy of Sciences, Mongolia, Myagmar G. ,   The Institute of Biology, Mongolian Academy of Sciences, Mongolia, Bayarmaa D. ,   The Institute of Biology, Mongolian Academy of Sciences, Mongolia, Byambasuren M. ,   Institute of Plant Protection Research, Mongolia, Ariunaa S. ,   Institute of Plant Protection Research, Mongolia, Uranchimeg A. ,   Institute of Plant Protection Research, Mongolia, Gantuyaa M. ,   Institute of Plant Protection Research, Mongolia
Published: September 2024

The first actinomycetes of the genus Streptomyces are found in the bottom sediments of the Chono Kharaikh River in Mongolia. The isolated strains of streptomycetes are representatives of the Cinereus section of the Achromogenes series and the Imperfectus section. The isolated actinomycetes showed antibacterial and antifungal activity against Bacillus subtilis, Staphylococus aureus, Aspergillus niger and phytopathogenic fungi Cladosporium sp.
Search for putative complete and near-complete genomes of DNA-containing viruses in metagenomes obtained from the Lake Baikal
Authors: Potapov S.A. ,   Limnological Institute Siberian Branch Russian Academy of Sciences, Ulan-Batorskaya St., 3, Irkutsk, 664033, Russia, Tupikin A.E. ,   Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences (ICBFM SB RAS), Ac. Lavrentieva ave., 8, Novosibirsk, 630090, Russia, Tikhonova I.V. ,   Limnological Institute Siberian Branch Russian Academy of Sciences, Ulan-Batorskaya St., 3, Irkutsk, 664033, Russia, Zhuchenko N.A. ,   Limnological Institute Siberian Branch Russian Academy of Sciences, Ulan-Batorskaya St., 3, Irkutsk, 664033, Russia, Belykh O.I. ,   Limnological Institute Siberian Branch Russian Academy of Sciences, Ulan-Batorskaya St., 3, Irkutsk, 664033, Russia
Published: September 2024

The paper presents the analysis of putatively complete and near-complete genomes of bacteriophages extracted from metagenomic data obtained from DNA samples isolated from Lake Baikal water using modern bioinformatic programs. A total of 73 sequences with lengths ranging from 13.8 kb to 163.7 kb belonging to phages of the Caudoviricetes class were identified. Two contigs belonging putatively to cyanophages with lengths of 36.8 kb and 163.7 kb were detected, and in the latter one an ORF with a length of 159 amino acid residues similar to the small heat shock protein (Hsp20) was identified. Analysis of the amino acid sequences identified in the assembled bacteriophage genomes using the PHROG database revealed that 27.5% of them have an unknown function, while the majority of those with similarity to known ones (23.7%) belong to the category “DNA, RNA and nucleotide metabolism”. A number of accessory metabolic genes (AMGs) were also detected in the assembled genomes: nadM, cysC, cobS, galE, cobT, etc. Most of the sequences with similarity to sequences from the IMG/VR database (89.6%) corresponded to sequences obtained from freshwater bodies.
Features of changes in the concentrations of nutrients and plankton at the thermal bar: A numerical experiment
Authors: Tsydenov B.O. ,   Tomsk State University, Lenin Ave., 36, Tomsk, 634050, Russia, Bart A.A. ,   Tomsk State University, Lenin Ave., 36, Tomsk, 634050, Russia, Degi D.V. ,   Tomsk State University, Lenin Ave., 36, Tomsk, 634050, Russia, Churuksaeva V.V. ,   Tomsk State University, Lenin Ave., 36, Tomsk, 634050, Russia, Trunov N.S. ,   Tomsk State University, Lenin Ave., 36, Tomsk, 634050, Russia
Published: September 2024

On the example of Barguzin Bay of Lake Baikal, mathematical modeling of the dynamics of nutrients and plankton during the development of the spring thermal bar was carried out. The meteorological data of the Ust-Barguzin station for June 2023 were set in the calculations. An analysis of the horizontal movement of the area of the maximum density temperature at the lake surface was carried out, the features of changes in the concentration of nitrates, ammonium, phosphates, dissolved oxygen, as well as phyto- and zooplankton in this area are described.
Cyanobacteria of alkaline ecosystems of Zabaikalie
Authors: Tsyrenova D.D. ,   Institute of General and Experimental Biology, Siberian Branch of the Russian Academy of Sciences, Sakhyanova St., 6, Ulan-Ude, 660047, Russia, Barkhutova D.D. ,   Institute of General and Experimental Biology, Siberian Branch of the Russian Academy of Sciences, Sakhyanova St., 6, Ulan-Ude, 660047, Russia
Published: September 2024

From the alkaline ecosystems of Zabaikalie, 12 monocultures of cyanobacteria belonging to the genera Anabaena, Leptolyngbya, Mastigocladus, Nodularia, Phormidium, Pseudanabaena and Synechococcus were isolated. The studied organisms showed themselves to be thermo- and alkaliphiles. The temperature optimum growth of cultures ranged from 40-55°C. Cultures were able to grow at alkaline pH values (8.5-9.5) and in a wide range of NaCl concentrations (0 to 100 g/l). Based on analysis of the 16S rRNA gene sequence, 5 strains of cyanobacteria were identified and described.
The modern methods development for microbiological water quality assessment in lakes
Authors: Zolotarev V.A. ,   I.D. Papanin Institute for biology of inland waters RAS, Borok, Yaroslavl obl., 152742, Russia, Kuznetsova E.V. ,   I.D. Papanin Institute for biology of inland waters RAS, Borok, Yaroslavl obl., 152742, Russia, Fedorov R.A. ,   I.D. Papanin Institute for biology of inland waters RAS, Borok, Yaroslavl obl., 152742, Russia
Published: September 2024

The functional diversity of free-living aquatic protozoans is discussed with respect to the feeding ecology, life strategies and water quality. Heterotrophic nanoflagellates (HNF) are known as most important grazers of bacteria in many aquatic ecosystems. Recent studies of flagellate feeding processes indicated that there are significant species-specific variability regarding the food uptake and food selection of bacterivorous flagellates. The Choanoflagellida have an essential role in microbial food webs contributing to a process of self-purification of water bodies as well as are used in monitoring systems. We show that diversity and relative abundance of ciliates and other protozoans can be used as indicators of toxic pollution and acidification. Multivariate statistics were used to design “the scale of toxicity” across a gradient of toxicant stress and organic compounds. A new index of periphyton flagellates (IPF) as indicator of the trophic status of a water-body and a simplified index for a sublethal toxicity assessment were developed.
Microperiphyton development in lakes and reservoirs
Authors: Zolotarev V.A. ,   I.D. Papanin Institute for biology of inland waters RAS, Borok, Yaroslavl obl., 152742, Russia, Stroinov Ya.V. ,   I.D. Papanin Institute for biology of inland waters RAS, Borok, Yaroslavl obl., 152742, Russia, Kosolapova N.G. ,   I.D. Papanin Institute for biology of inland waters RAS, Borok, Yaroslavl obl., 152742, Russia
Published: September 2024

Biofilms play an important role in the material flux of lakes and other aquatic ecosystems, but little is known about the mechanisms controlling their community structure under natural conditions. In the present study, we focused on the use of artificial substrates for the life strategies of microbial communities investigation. Heterotrophic nanoflagellates (HNF) are known as most important grazers of bacteria in the biofilm communities. The Choanoflagellida have an essential role in microbial food webs contributing to a process of self-purification of water bodies as well as sponge choanocytes, filtering large water volumes. Effects of Cyanobacteria and other pathogenic microorganisms on sponges are very similar to the same effects on Choanoflagellida and HNF in the early phase of biofilm colonization. Standard microbial biofilms (model communities) can serve for ecorobots development.
About the possible existence of the Selizharovo proglacial lake
Authors: Baranov D.V. ,   Institute of geography RAS, Moscow, Russia, Panin A.V. ,   Institute of geography RAS, Moscow, Russia, Karpukhina N.V. ,   Institute of geography RAS, Moscow, Russia
Published: September 2024

The formation of the incision valley near Selizharovo is associated with the existence of a proglacial lake in the Late Valdai. Geological and hypsometric data indicate its possible level is not lower than 205 m and not higher than 210 m asl. However, at this level of the lake, a incision would not be possible, since the edges of the valley are located at an altitude of 215 – 220 m asl. We assume that the depression at Selizharovo already existed by the beginning of the Late Valdai, and then it deepened and was renewed.
Evolution of coastal ecosystems in the Ussuriysky Bay Head since the final phase of the Middle Holocene
Authors: Belyanin P.S. ,   The Pacific Geographical Institute of the Far Eastern Branch of the Russian Academy of Sciences, Radio Str., 7, Vladivostok, 690041, Russia, Belyanina N.I. ,   The Pacific Geographical Institute of the Far Eastern Branch of the Russian Academy of Sciences, Radio Str., 7, Vladivostok, 690041, Russia
Published: September 2024

Pollen record obtained from sediments of the high floodplain terrace of the River Knevichanka, allowed to reconstruct the evolution of coastal vegetation in the Ussuri Bay Headover the last 5350 years cal BP. It was found that broad-leaved plants under warm and moisture climate during the final phase of the mid-Holocene Thermal Maximum were more widespread in the mountain ecosystems than at present. Mixed grass meadow, small-leaved plant communities were dominated on the accumulative plain, with common birch, hybrid birches and alder. The cooling that began at the end of the Middle Holocene and continued in the beginning of the Late Holocene led to a decrease of broad-leaved trees and a wider distribution of small-leaved ones in the vegetation. At the end of the Late Holocene, in the Ussuriysky Bay Head, were formed the oak-broadleaf forests with fir and Korean pine which represent the modern appearance of ecosystems.
Holocene vegetation history of the Western Caucasus inferred from high-resolution pollen record from Lake Khuko
Authors: Chepurnaya A.A. ,   Lomonosov Moscow State University, Vorobievy Gory, 1, Moscow, 119991, Russia, Novenko E.Y. ,   Institute of Geography RAS, Staromonetny per., 29/4, Moscow, 119017, Russia
Published: September 2024

The paper presents the new paleoecological evidence for the last 10,000 years based on high resolution pollen record supported by detail radiocarbon dating, obtained from the Khuko Lake (Western Caucasus). The obtained results showed that change of vegetation corresponding main Holocene stages. 10368-10577 – 8000-8200 cal. yr BP – Boreal period was characterized in this region by the presence of both broad-leaved (Fagus, Ulmus) and coniferous (Abies) species to an equal. 8000-4400 cal. yr BP – Atlantic period was marked by predominance of broad-leaved forests have been formed mainly by beech and a little hornbeam. 4400-2600 cal. yr BP – Subboreal period is characterized by an increase in the role of boreal vegetation (Abies, Pinus). 2600 cal. yr BP up now – Subatlantic period looked like Atlantic period, but at this time declined value of coniferous species and grew value of alder and hazel.
Late Pleistocene and Holocene sediments of Lake Chukhlomskoye
Authors: Filippova K.G. ,   Institute of Geography RAS, 29/4 Staromonetny per., Moscow, 119017, Russia, Konstantinov E.A. ,   Institute of Geography RAS, 29/4 Staromonetny per., Moscow, 119017, Russia, Zakharov A.L. ,   Institute of Geography RAS, 29/4 Staromonetny per., Moscow, 119017, Russia, Kuzmenkova N.V. ,   Institute of Geography RAS, 29/4 Staromonetny per., Moscow, 119017, Russia,   Lomonosov Moscow State University, Chemistry Department, Radiochemistry Division, 1/10 Kolmogorov str., Moscow, 119234, Russia
Published: September 2024

The paper discusses the structure of the bottom sediments of Lake Chukhlomskoye (Kostroma region, Russia). The results of complex lithological analysis and 14C AMS dating (TOC) of the sediments revealed in two boreholes located in different geomorphological positions of the bottom relief allowed to reconstruct stages and conditions of sedimentation in the lake. Mass accumulation rate (MAR) was calculated. High values of MAR correspond to 25.4–17.5 cal ka BP (up to 0.192 g/cm2 per year), a sharp decrease of MAR corresponds to 17.9–16.7 cal ka BP, and another stage of sediment influx occurred in Younger Dryas. Holocene MAR is low (0.001–0.053 g/cm2 per year).
Fossil cladoceran record from Lake Beloe in the Altai region (Western Siberia) during the late Holocene
Authors: Frolova L.A. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia,   Institute of archaeology and ethnography of the Russian Academy of Sciences, Acad. Lavrentiev Avenue 17, Novosibirsk, 630090, Russia, Nigmatullin N.M. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia, Ibragimova A.G. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia, Li H.C. ,   Department of Geosciences, National Taiwan University, Taipei, 10617, Taiwan, POC, Nurgaliev D.K. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia
Published: September 2024

An analysis of subfossil Cladocera in a 193-cm sediment core from Lake Beloe (Altai region) was conducted to trace the history of limnological conditions in the lake over the past 4600 years. Currently, a total of 34 Cladocera taxa were identified in the taphocenosis. The greatest cladoceran species richness was observed among littoral forms of Cladocera, reflecting the presence of shallow areas overgrown with macrophytes. The highest concentration of cladoceran remains was observed in the lower horizons of the core (150-191 cm, 3600-4600 cal yr BP). In this zone, the highest values of Hill indices are recorded, indicating high taxonomic diversity in the community. At a depth of 141 cm (3500 cal yr BP), significant changes in community structure occur, with Chydorus cf. sphaericus beginning to dominate. Taxonomic diversity of Cladocera noticeably increases in the upper part of the core.
On the issue of the formation of a “pink horizon” in varved clays of the Onega Ice Lake
Authors: Golyeva A.A. ,   Institute of Geography Russian Academy, Staromonetnij per., 27, Moscow, 119017, Russia, Mergelov N.S. ,   Institute of Geography Russian Academy, Staromonetnij per., 27, Moscow, 119017, Russia, Subetto D.A. ,   Herzen State Pedagogical University of Russia, Moika emb. 48, 191186, Saint-Petersburg, Russia
Published: September 2024

The paper presents the results of a study of samples from the “pink horizon” in sediments of the Onega Ice Lake. A large amount of iron in this horizon is shown, their shapes and sizes are determined. The presence of microbial mats and biofilms in this layer was revealed, and a conclusion was made about the rate of accumulation of varyed clays.
Distribution of mercury in lakes of different landscape zones in the south of Western Siberia using the example of model objects along a meridional transect
Authors: Malov V.I. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Ave. Academician Koptyug, 3, Novosibirsk, 630090, Russia, Strakhovenko V.D. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Ave. Academician Koptyug, 3, Novosibirsk, 630090, Russia, Ovdina E.A. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Ave. Academician Koptyug, 3, Novosibirsk, 630090, Russia, Malov G.I. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Ave. Academician Koptyug, 3, Novosibirsk, 630090, Russia
Published: September 2024

The work presents data on the concentration of mercury in bottom sediments of lakes, which are characterized by the nival type of sedimentogenesis. The mercury content for bottom sediments of lakes sampled in the middle and high mountains of the Altai Mountains is on average 0.06 μg/g. Differences in mercury concentration values for high- and mid-mountain lakes have not been established. It has been established that, regardless of the type of sedimentogenesis in lakes of different landscape zones of the south of Western Siberia along the meridional transect, the distribution of mercury along the section is characterized by an increase in values up the section towards the bottom sediments-water boundary, where they reach maximum values.
Lake evolution and climate change in the South-West Siberia
Authors: Maltsev A.E. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia, Krivonogov S.K. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia,   Korkyt-Ata Kyzylorda University, Aiteke bi 29A, Kyzylorda, 120014, Kazakhstan, Solotchina E.P. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia, Smolentseva E.N. ,   Institute of Soil Science and Agrochemistry, Siberian Branch of the Russian Academy of Science, Academician Lavrentiev ave., 8/2, Novosibirsk, 630090, Russia
Published: September 2024

A complex of mineralogical and geochemical data from the south of Western Siberia indicates that the middle Holocene warm and dry epoch ended 5.5–4 cal ka BP with the further onset of more humid and cold conditions in the region. Significant changes in the regional climate probably occurred about 3.6–3.1 cal ka BP that is marked by an increase in the content of carbonates in the sediments, and by changes in vegetation. A general trend in the content of Mg in the carbonate fraction of lake sediments clearly shows a variation in water salinity as a response to climate change. There was a cyclical change of periods of drying/humidification of the Holocene climate of southern Western Siberia.
Lake level dynamics in the centre of the East European Plain during the Holocene
Authors: Konstantinov E.A. ,   Institute of Geography RAS, 29 building 4 Staromonetny lane, Moscow, 119017, Russia, Karpukhina N.V. ,   Institute of Geography RAS, 29 building 4 Staromonetny lane, Moscow, 119017, Russia, Zakharov A.L. ,   Institute of Geography RAS, 29 building 4 Staromonetny lane, Moscow, 119017, Russia, Rudinskaya A.I. ,   Institute of Geography RAS, 29 building 4 Staromonetny lane, Moscow, 119017, Russia, Ukraintsev V.Yu. ,   Institute of Geography RAS, 29 building 4 Staromonetny lane, Moscow, 119017, Russia, Samus A.V. ,   Institute of Geography RAS, 29 building 4 Staromonetny lane, Moscow, 119017, Russia, Lazukova L.I. ,   Institute of Geography RAS, 29 building 4 Staromonetny lane, Moscow, 119017, Russia
Published: September 2024

Based on the lithostratigraphic and geomorphological approach, the study of lake level fluctuations in Nero and Seliger over the past 15,000 years was conducted. Common features of level changes were revealed: deep regression at the end of the late glacial period and early Holocene, intensive rise in level in the early-middle Holocene, stabilization (with a slight upward trend) in the late Holocene. Similar features in level changes were revealed in the history of a number of lakes in Germany and Scandinavia. A connection was found between lake level fluctuations and the intensity of fluvial processes in the center of the East European Plain.
Organic matter in the lacustrine sediments of the Kama-Keltma lowland (Cis-Urals): assessment of distribution and dynamics in the Late Pleistocene and Holocene
Authors: Kopytov S.V. ,   Perm State University, Bukireva str. 15, Perm, 614990, Russia,   Perm State Humanitarian Pedagogical University, Sibirskaya str. 24, Perm, 614990, Russia, Sannikov P.Yu. ,   Perm State University, Bukireva str. 15, Perm, 614990, Russia, Mekhonoshina E.A. ,   Perm State University, Bukireva str. 15, Perm, 614990, Russia, Solovyova E.E. ,   Perm State University, Bukireva str. 15, Perm, 614990, Russia, Samarkina A.A. ,   Perm State University, Bukireva str. 15, Perm, 614990, Russia
Published: September 2024

The short communication article presents the results of analyses of the lacustrine sediments of Novozhilovo and Chelvinskoe lakes, located at the Kama-Vychegda watershed. Big set (209) of sediments samples from three wells were analyzed by the loss on ignition (550 °C) method. Age of cores and the rate of sediment accumulation were based on the 14 radiocarbon dates. Six stages of deposits accumulation and nature dynamics during the Late Glacial and Holocene in the lakes catchment area are proposed. The first stage (14.15 – 13.5 cal. kyr BP) is characterized by high rates of deposits accumulation at low values of organic matter content, indicating alluvial sedimentogenesis. Peak of accumulation rates as well as a sharp rise in bioaccumulation were observed during the second stage (13.5 – 12.4 cal. kyr BP), which is interpreted as stabilization of the lake level and external environmental conditions. During the third stage (12.4 – 10.7 cal. kyr BP), the sediment accumulation rate decreases rapidly, reaching a minimum by the end of the period. The organic matter content also decreases significantly (to 30 %). The short-term fourth period (10.7 – 10.0 cal. kyr BP) records the transition from the Late Pleistocene (dominance of rarefied periglacial vegetation) to the Early Holocene (predominance of forest communities). This is marked by a drastic increase in the loss on ignition values (up to 92-95%). During the fifth stage (10.0 – 8.8 cal. kyr BP), the sediments accumulation rate increases and the organic matter content decreases to 77-82%. Synchronously with some increase in the concentration of mineral particles. Smoothing of the loss on ignition curve (average values - 92-96%), a marked increase in the sediment accumulation rate during the sixth stage (8.8 - 5.0 cal. kyr BP) probably indicates the stabilisation of external conditions in the lake catchment.
Peat deposits for studying the Holocene fire regime in the example of Kansk forest-steppe mires
Authors: Mikhailova A.B. ,   Federal State Autonomous Educational Institution of Higher Education «Siberian Federal University», Svobodny str, 79, Krasnoyarsk, 660041, Russia, Grenaderova A.V. ,   Federal State Autonomous Educational Institution of Higher Education «Siberian Federal University», Svobodny str, 79, Krasnoyarsk, 660041, Russia, Chentaeva Z.V. ,   Federal State Autonomous Educational Institution of Higher Education «Siberian Federal University», Svobodny str, 79, Krasnoyarsk, 660041, Russia, Skrebatun A.A. ,   Federal State Autonomous Educational Institution of Higher Education «Siberian Federal University», Svobodny str, 79, Krasnoyarsk, 660041, Russia
Published: September 2024

The results of Holocene fires history reconstruction in the Kansk forest-steppe Kranoyarsk Territory are presented using the example the Kuskun mire (Esaulovka river basin) and Rybnoye mire (Rybnaya river basin). The complex of paleoecological methods (analysis of macrofossils in peat and charcoal analysis) are using. The stages of increased fire activity were established at 4000-3000 and 1500-500 cal yr BP. These time intervals coincide with a decrease in moisture during the subboreal xerothermic maximum and a short dry period 1400-1300 cal. yr BP subsequently replaced by the Medieval Warm Period. When comparing the results obtained, a coincidence of long fire episodes with a change in local vegetation was revealed.
Litho- and biostratigraphy of the Holocene sediments in the southern part of Lake Ladoga
Authors: Kuznetsov D.D. ,   Institute of Limnology of the Russian Academy of Sciences – SPC RAS, Sevastyanova str. 9, St. Petersburg 196105, Russia, Ludikova A.V. ,   Institute of Limnology of the Russian Academy of Sciences – SPC RAS, Sevastyanova str. 9, St. Petersburg 196105, Russia, Revunova A.V. ,   Institute of Limnology of the Russian Academy of Sciences – SPC RAS, Sevastyanova str. 9, St. Petersburg 196105, Russia
Published: September 2024

We present the results of study sediment core, taken in the southern part of Lake Ladoga at the depth of 44 m. The sediments are gray silt with total thickness of 0.8 m. Diatom and loss-on-ignition and grain-size analyzes and radiocarbon dating were carried out. The retrieved sediments formed during the Holocene starting from the regression of the Ancylus Lake at the Baltic ca. 10,200 cal. BP. Changes in the composition of diatom assemblages and the dynamics of organic accumulation correspond to the typical scenarios that we recorded in the Holocene sediments in the central part of Lake Ladoga. No sedimentary hiatuses were recorded. Thus, it has been established that aquatic, relatively deep-water conditions existed in this part of the Ladoga basin starting from the Early Holocene with the accumulation of fine-grained sediments.
Bottom sediments of Lake Peyungda as a natural archive of climatic and catastrophic events in the past
Authors: Novikov V.S. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences , Akademika Koptyuga Ave., 3, Novosibirsk, 630090, Russia, Darin A.V. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences , Akademika Koptyuga Ave., 3, Novosibirsk, 630090, Russia, Rogozin D.Yu. ,   Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok, 50/50, Krasnoyarsk, 660036, Russia, Meidus A.V. ,   Krasnoyarsk State Pedagogical University named after. Astafieva, st. Ady Lebedeva, 89, Krasnoyarsk, 660049, Russia, Babich V.V. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences , Akademika Koptyuga Ave., 3, Novosibirsk, 630090, Russia, Markovich T.I. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences , Akademika Koptyuga Ave., 3, Novosibirsk, 630090, Russia
Published: September 2024

Using scanning micro-XRF using synchrotron radiation, profiles of changes in the section depth of the elemental composition of the banded clays of Lake Peyungda (Krasnoyarsk region), located 33 km southwest of the epicenter of the Tunguska disaster of 1908, were obtained. The age model is confirmed by the presence of a dated layer of anomalous thickness associated with the fall and explosion of the Tunguska cosmic body (TCB). Changes in element contents in dated core layers are compared with instrumental meteorological observation data over the last century, and a relationship is found between the average annual temperature of the region and the elemental composition of coeval layers of bottom sediments (transfer function). According to scanning electron microscope and Raman spectroscopy, the 1908 layer is characterized by increased concentrations of Ti-containing minerals (anatase). The appearance of anatase is probably associated with the explosion of the TCB and the subsequent intense erosion of dolerite bodies, which are widely represented in the catchment area.
Diatoms of surface bottom sediments of lakes in Mongolia
Authors: Popova D.N. ,   M. K. Ammosov North-Eastern Federal University, Belinskogo Str., 58, Yakutsk, 677000, Russia, Pestryakova L.А. ,   M. K. Ammosov North-Eastern Federal University, Belinskogo Str., 58, Yakutsk, 677000, Russia, Levina S.N. ,   M. K. Ammosov North-Eastern Federal University, Belinskogo Str., 58, Yakutsk, 677000, Russia, Rydaya N.А. ,   Institute of Archeology and Ethnography SB RAS, Academician Lavrentiev Ave., 17, Novosibirsk 630090 Russia
Published: September 2024

This paper presents data on lake sediments that were selected from 5 lakes in Mongolia (10 points); the lakes are located at different absolute elevations above sea level. The purpose of this work is to study diatoms from surface bottom sediments (0-2 cm). In addition, the morphometric and physicochemical characteristics of the water in these lakes were studied. The water of the studied lakes was mainly ultra-fresh (40% of the lakes), the remaining 60% had fresh, slightly fresh and salt water (20% each). Such morphometric parameters as the area of the water surface, the length and width of the lake, the average width, the maximum depth and others were studied. As a result of studying the composition of diatoms, 111 species were identified that belong to 3 classes of Bacillariophyta. In terms of the number of species discovered, Lake Boon-Tsagan-Nuur turned out to be the richest. 10 species are classified as dominants, among them Staurosira venter can be distinguished; among the common species, Pseudostaurosira brevistriata stands out, which is dominant and subdominant in 5 samples; Stephanocyclus meneghinianus, Lindavia radiosa - dominants and subdominants in 4 samples. The diatom flora of the studied reservoirs shows that bottom forms predominate in the lakes.
Late Pleistocene and Holocene Sedimentation in the glacial Lake Sosednee, Magadan region
Authors: Pozhidaeva D.K. ,   North-East Interdisciplinary Scientific Research Institute n.a. N.A. Shilo FEB RAS, 16 Portovaya St., Magadan, 685000, Russia,   Kazan Federal University, Institute of Geology and Petroleum Technologies, 4/5 Kremlevskaya st., Kazan 420008, Russia, Minyuk P.S. ,   North-East Interdisciplinary Scientific Research Institute n.a. N.A. Shilo FEB RAS, 16 Portovaya St., Magadan, 685000, Russia
Published: September 2024

Lake Sosednee is located in the Yagodninsky district of the Magadan region. It was formed in the Late Pleistocene around 22,500 cal. years ago. The rock magnetic, geochemical, palynological, and mineralogical characteristics of the sediments of four cores, as well as moraine, and various grain size fractions of the hillslope sediments were studied. It has been established that the geochemical and rock magnetic properties of sediments from lake Sosednee reflect different sedimentation conditions, changing from the cold climate of the Late Pleistocene to the warm climate of the Holocene. In the lower part of the core, authigenic (hemogenic) formation of iron sulfides, including magnetic ones, was revealed. According to the rock magnetic and geochemical data, the Younger Dryas was identified, the end of which corresponds to the Pleistocene–Holocene boundary.
Indicators of paleocryogenic processes that disrupt the patterns of peatland autogenic development in the zone of seasonal freezing of rocks of Western Siberia
Authors: Preis Yu.I. ,   Institute for Monitoring of Climatic and Ecological Systems SB RAS, Academichesky ave., 10/3, Tomsk, 634005, Russia
Published: September 2024

Оn the data of detailed studies in 2003-2019 and dating of 14C, AMS, 210Pb and 137Cs peat sections of the zone of seasonal freezing of rocks of Western Siberia indicators of paleocryogenic processes were searched. The functional state of these peatlands was reconstructed as a response to continental climate changes. A system-evolutionary methodological approach to the search for disturbances of autogenic development of peatlands, dating of pairs of neighboring peat samples to identify the peat accumulation stopping, data on peat sections - analogues from the permafrost zone and data on paleoreconstructions of the Holocene climate of Western Siberia were used. This allowed indicators of paleocryogenic processes to be proposed. The use of these indicators will increase the objectivity of studying the climatic paleoreconstructions of the territory.
New data on the Pleistocene history of the Aral Sea-Lake
Authors: Panin A.V. ,   Institute of Geography, Russian Academy of Sciences, Staromonetny Lane 29, 119017 Moscow, Russia, Ludikova A.V. ,   Institute of Limnology, Russian Academy of Sciences, SPC RAS, Sevastyanova str. 9, St. Petersburg, 196105, Russia, Sapelko T.V. ,   Institute of Limnology, Russian Academy of Sciences, SPC RAS, Sevastyanova str. 9, St. Petersburg, 196105, Russia, Uspenskaya O.N. ,   All-Russian Research Institute of Vegetable Growing. Vereya vill., str. 500, Ramensky district, Moscow Oblast, 140153, Russia, Borisova O.K. ,   Institute of Geography, Russian Academy of Sciences, Staromonetny Lane 29, 119017 Moscow, Russia, Zagorulko V.A. ,   Institute of Geography, Russian Academy of Sciences, Staromonetny Lane 29, 119017 Moscow, Russia, Utkina A.O. ,   Institute of Geography, Russian Academy of Sciences, Staromonetny Lane 29, 119017 Moscow, Russia
Published: September 2024

A 23.5 m deep borehole was drilled on the dried bed of the Aral Sea 9 km south of the former Barsakelmes Island. At a depth of 21.3 m, the borehole penetrated Paleogene bedrock. In the interval 21.3 - 15.2 m the conditions of a shallow freshwater reservoir at a considerable distance from the flowing rivers (deltaic channels of the Syr Darya River) - the first phase of filling of the Aral Basin with river water - were reconstructed. It has been preliminary attributed by three 14C AMS dates to the time about 23-25 thousand years BP. Above 15.2 m of the section the conditions become even more shallow, starting from 12.0 m of the section - brackish-water. The upper 10.5 m of the section correlates with the sediments of the modern geological phase of the Aral Sea development studied in detail in the same area by Burr et al. (2019), the beginning of which was estimated at 17.6 thousand BP. The new data obtained indicate an earlier appearance of the modern Aral Sea, which originated as a shallow freshwater body.
The influence of palaeo-fire activity on the dynamics of vegetation cover in the piedmont of Northern Altai for the past 16000 years
Authors: Pupysheva М.А. ,   Institute of Monitoring of Climatic and Ecological Systems SB RAS, Akademichesky av., 10/3, Tomsk, 634055, Russia, Blyakharchuk T.A. ,   Institute of Monitoring of Climatic and Ecological Systems SB RAS, Akademichesky av., 10/3, Tomsk, 634055, Russia,   Tomsk State University, Lenin av., 36, Tomsk, 634050, Russia
Published: September 2024

This work presents results of reconstructing dynamics of palaeo-fires in the piedmont of Northern Altai over the past 16185 cal. yr BP on the example of sediments of the Mokhovoe mire (Altai krai). 27 local fire episodes were identified based on macro-charcoal analysis and statistical processing in the CharAnalysis software package in R space. According these data, 7 periods of maximum pyrogenic activity were identified over the entire period of the Mokhovoe mire existed. The obtained data were compared with published paleoecological reconstructions for the Mokhovoe mire. To identify relationship between vegetation and fires, we carried out a correlation analysis between macro-charcoal and pollen data using the Pearson method in the PAST program. As a result, the possible influence of fires on the change of vegetation cover (post-fire successions) was revealed. The study also recorded high pyrogenic activity during warm and humid climatic periods when fir (Abies sibirica) dominated in the vegetation cover.
The mid- and Late Holocene history of forest fires in Central Evenkia inferred from macrocharcoal analysis
Authors: Shatunov A.E. ,   Department of Quaternary Paleogeography, Institute of Geography Russian Academy of Science, Staromonetny Lane, 29, Moscow, 119017, Russia, Kupriyanov D.A. ,   Department of Quaternary Paleogeography, Institute of Geography Russian Academy of Science, Staromonetny Lane, 29, Moscow, 119017, Russia, Prokushkin A.S. ,   V.N. Sukachev Institute of Forest SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, Akademogorodok 50/28, 660036, Krasnoyarsk, Russia, Mazei N.G. ,   Department of Physical Geography and Landscape Science, Faculty of Geography, Lomonosov Moscow State University, Leniskie Gory 1, Moscow, 119991, Russia, Novenko E.Yu. ,   Department of Quaternary Paleogeography, Institute of Geography Russian Academy of Science, Staromonetny Lane, 29, Moscow, 119017, Russia
Published: September 2024

The paper presents the reconstruction of the Mid- and Late Holocene frequency of forest fires in the Lower Tunguska River basin in the vicinity of the settlement of Tura (central Evenkia) revealed from plant macro remains and macroscopic charcoal analysis of peat cores from two peatlands. The results of analysis showed similar patterns of charcoal accumulation rates in peat deposits from both bogs during the Holocene and their significant temporal variability. According to the data obtained, the stages of increased frequency and intensity of fires in Central Evenkiya occurred during the periods 7800-6500 cal years BP and 3800-2900 cal years BP and were influenced by climatic factors. The period of increasing fire activity, which has been observed from the first half of the XVII century to the present day, was caused by a combination of anthropogenic and natural factors. A decline in the charcoal accumulation rate in peatlands and an increase in the length of fire return intervals were characteristic for periods 6500-3800 cal years BP and 2900-600 cal years BP. Perhaps the cooling climate created unfavorable conditions for the occurrence and spread of forest fires.
Stanols in lake sediments of Central Siberia as an indicator of anthropogenic impact
Authors: Sinner E.K. ,   Siberian Federal University (SibFU), 79 Svobodny Ave, Krasnoyarsk region, Krasnoyarsk, 660041, Russia,   Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), Akademgorodok Str., 50/50, Krasnoyarsk region, Krasnoyarsk, 660036, Russia, Boyandin A.N. ,   Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), Akademgorodok Str., 50/50, Krasnoyarsk region, Krasnoyarsk, 660036, Russia, Zykov V.V. ,   Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), Akademgorodok Str., 50/50, Krasnoyarsk region, Krasnoyarsk, 660036, Russia, Rogozin D.Y. ,   Siberian Federal University (SibFU), 79 Svobodny Ave, Krasnoyarsk region, Krasnoyarsk, 660041, Russia,   Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), Akademgorodok Str., 50/50, Krasnoyarsk region, Krasnoyarsk, 660036, Russia
Published: September 2024

The bottom sediments of the lakes contain biochemical markers of fecal intake, which have been renewed interest in the last few years. This analysis is one of the newest trends in paleolimnology. Fecal markers include sterols recovered by the intestinal microflora – stanols, which are indicators of fecal intake into reservoirs. Relative to other mammals, humans produce the largest amount of coprostanol. Therefore, based on its presence in bottom sediments, the dynamics of human presence in early times can be reconstructed, as well as the fecal anthropogenic load on reservoirs. Using the gas chromatography method with mass spectrometric detection, for the first time we estimated the contents of coprostanol, epicoprostanol, 5α-cholestanol and cholesterol in the bottom sediments of Lakes Peyungda and Zapovednoye (Evenkia, Krasnoyarsk Krai), and also estimated the indices R1 and R2, reflecting the human contribution to fecal intake. The absence of an increase in the proportion of coprostanol in both lakes may indicate a slight anthropogenic impact. Both in the modern period and in earlier times (about 5000 years for Peyungda and 2500 years for Zapovednoye), there were probably no settlements near the lakes.
On the features of authigenic minerals in bottom sediments of lakes formed during nival, humid and arid types of sedimentogenesis
Authors: Strakhovenko V.D. ,   V.S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences (RAS), 3 Akad. Koptyug Pr., Novosibirsk, 630090 Russia, Ovdina E.A. ,   V.S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences (RAS), 3 Akad. Koptyug Pr., Novosibirsk, 630090 Russia, Malov G.I. ,   V.S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences (RAS), 3 Akad. Koptyug Pr., Novosibirsk, 630090 Russia, Malov V.I. ,   V.S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences (RAS), 3 Akad. Koptyug Pr., Novosibirsk, 630090 Russia, Subetto D.A. ,   Herzen State Pedagogical University of Russia, 48 Moika Emb., Saint-Petersburg, 191186, Russia, Belkina N.A. ,   Herzen State Pedagogical University of Russia, 48 Moika Emb., Saint-Petersburg, 191186, Russia,   Northern Water Problems Institute of the Karelian Research Centre of the Russian Academy of Sciences, 50 Alexander Nevsky Pr., Petrozavodsk, 185030, Russia
Published: September 2024

The comparison of autigenic minerals from the bottom sediments of lakes located under conditions of nival, humid and arid sedimentation is carried out. The long-term presence of ice cover on the lake, which prevents the mixing of water masses, the introduction of terrigenous material, oxygen-free conditions in the residual part of the waters under the ice and their local supersaturation with gases, makes it possible to form autigenic minerals in fresh waters of lakes located under conditions of nival, humid and arid sedimentation. The shape of the crystalline aggregates of the newly formed phases is determined by the conditions of their crystallization, mainly by the ionic composition of the residual water and microbiological factors.
Reconstruction of paleoecological and paleofire dynamics of the Tobol areas based on materials from lake-swamp deposits of Oskino
Authors: Trubitsyna E.D. ,   Tyumen Scientific Centre Siberian Branch of the Russian Academy of Sciences, Malygina Str., 86, Tyumen, 625026, Russia, Ryabogina N.E. ,   University of Gothenburg, box 200, 405 30 Gothenburg, Sweden, Zelenkova R.R. ,   Tyumen Scientific Centre Siberian Branch of the Russian Academy of Sciences, Malygina Str., 86, Tyumen, 625026, Russia
Published: September 2024

The paper compares palaeoecological, archaeological and palaeo-fire data from lake-swamp deposits of the Tobol river region, obtained as a result of the study of the Oskino wetland lake. The dependence of palaeofire dynamics on human economic activity and climate-induced changes in plant communities is analysed. The reconstruction covers 9.6 ka, including the entire period of occupation of the area, as well as the end of the Greenlandian stage and the beginning of the Northgrippian stage. Comparison of pollen data, concentration of macroscopic charcoal particles in lake-swamp sediments showed a correlation between decreasing moisture levels, increasing conifer proportion in forest composition and increasing fire frequency. It has been established on the vegetation anthropogenic influence was little (pollen data) partly due to this is related to the orientation population towards an appropriative type of economy up to 4.5 ka BP. The palynological data not show significant changes in the residential landscape or an increase in the frequency of fires in connection with the emergence of livestock breeding in the Late Bronze Age. In the Early Iron Age, semi-nomadic livestock breeding was formed the population probably did not need to burn forests for grazing, so the intensity of fires did not increase.
Current state, microbiological monitoring, and prevention of water pollution in Lake Baikal
Authors: Drucker V.V. ,   Limnological Institute Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya Str., 3, Irkutsk, 664033, Russia
Published: September 2024

Since 2003, Limnological Institute SB RAS has been holding the International Baikal Microbiological Symposia “Microorganisms and Viruses in Aquatic Ecosystems” every four years, and even in the “covid” year 2020, it was held “in remote mode.” The proper functioning of viral and bacterial communities is the basis for the stable quality of aquatic ecosystems. New ecological problems for the Lake Baikal ecosystem are becoming more and more acute, and the scientific research, the results of which are presented and discussed at these symposia for different aquatic ecosystems around the world, should help to find solutions for preserving the water quality now and in the future. We analyze the long-term microbiological studies of the water quality in the littoral and pelagic zones of Lake Baikal carried out by numerous authors, and propose a specific scheme of microbiological monitoring of this unique aquatic ecosystem required by the environmental regulatory authorities. Specific measures to prevent pollution of oligotrophic lake waters are also provided; these measures can be rapidly implemented now.