scholarly journals Cyanobacterial bloom in the world largest freshwater lake Baikal

Author(s):  
Zorigto Namsaraev ◽  
Anna Melnikova ◽  
Vasiliy Ivanov ◽  
Anastasia Komova ◽  
Anton Teslyuk
2021 ◽  
Vol 908 (1) ◽  
pp. 012009
Author(s):  
D D Tsyrenova ◽  
S V Zaitseva ◽  
O P Dagurova ◽  
V B Dambaev ◽  
D D Barkhutova

Abstract We studied freshwater Lake Dikoye located in the coastal zone of Lake Baikal. Negative changes associated with cyanobacterial bloom were observed in the lake. Phototrophs were represented by cyanobacteria, green algae, and diatoms. In the microbial community, Cyanobacteria were the dominant phylum and accounted for up to 48% of the total diversity. Cyanobacteria were represented by 7 genera and 9 species. Microcystis aeruginosa, a potentially toxic species, was dominant among cyanobacteria. According to chlorophyll a content, the lake should be assigned to eutrophic ones. The bacterial eutrophication index for the lake studied varied from 1.17 (middle eutrophic) to 28.2 (hypereutrophic) during cyanobacterial bloom.


2008 ◽  
Vol 14 (8) ◽  
pp. 1947-1958 ◽  
Author(s):  
STEPHANIE E. HAMPTON ◽  
LYUBOV R. IZMEST'EVA ◽  
MARIANNE V. MOORE ◽  
STEPHEN L. KATZ ◽  
BRIAN DENNIS ◽  
...  

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3514
Author(s):  
Igor Tokarev ◽  
Evgeny Yakovlev

In natural water, as a rule, there is a violation of radioactive equilibrium in the chain 238U … → 234U → 230Th →. Groundwater usually has a 234U/238U ratio in the range of 0.8–3.0 (by activity). However, in some regions, the 234U/238U ratio reaches >10 and up to 50. Ultrahigh excesses of 234U can be explained by climatic variations. During a cold period, minerals accumulate 234U as a normal component of the radioactive chain, and after the melting of permafrost, it is lost from the mineral lattice faster than 238U due to its higher geochemical mobility. This hypothesis was tested using data on the isotopic composition of uranium in the chemo- and bio-genic formations of the World Ocean and large lakes, which are reservoirs that accumulate continental runoff. The World Ocean has the most significant 234U enrichments in the polar and inland seas during periods of climatic warming in the Late Pleistocene and Holocene. In the bottom sediments of Lake Baikal, the 234U/238U ratio also increases during warm periods and significantly exceeds the 234U excess of the World Ocean. Furthermore, the 234U/238U ratio in the water of Lake Baikal and its tributaries increases from north to south following a decrease in the area of the continuous permafrost and has a seasonal variation with a maximum 234U/238U ratio in summer. The behavior of 234U in large water reservoirs is consistent with the hypothesis about the decisive influence of permafrost degradation on the anomalies in 234U/238U ratios in groundwater.


2011 ◽  
Vol 79 (2) ◽  
pp. 348-358 ◽  
Author(s):  
Vitaly V. Kadnikov ◽  
Andrey V. Mardanov ◽  
Alexey V. Beletsky ◽  
Olga V. Shubenkova ◽  
Tatiana V. Pogodaeva ◽  
...  

Microbiology ◽  
2021 ◽  
Vol 90 (3) ◽  
pp. 298-313
Author(s):  
T. I. Zemskaya ◽  
S. V. Bukin ◽  
A. V. Lomakina ◽  
O. N. Pavlova
Keyword(s):  

Phytotaxa ◽  
2013 ◽  
Vol 154 (1) ◽  
pp. 1 ◽  
Author(s):  
JOHN P. KOCIOLEK ◽  
MAXIM S. KULIKOVSKIY ◽  
CÜNEYT N. SOLAK

We describe 22 new species of Gomphoneis, and report several previously described taxa, from historical and recently made collections from Lake Baikal, Russia. We use light microscopy to document all taxa, and scanning electron microscopy to illustrate several of the species from the lake. All of the species present in Lake Baikal are part of the Elegans subgroup of the genus. Despite previous reports, we could find no representatives of the Herculeana subgroup in Baikal. We provide comparisons between the taxa, and document variability in the features found in the species. Two groups within the Elegans subgroup are present; most have 4 (or more) stigmoids, while a minority of the species lack stigmoids. We suggest that the species in Lake Baikal have two origins; one from the West, where an arc of related species spans Mongolia, NW China to Macedonia, and the second from western North America. Radiation of the two groups has resulted in species flocks. The number of Gomphoneis species in Lake Baikal is the largest number of species of the genus anywhere in the world.


2018 ◽  
Vol 35 (8) ◽  
pp. 635-647 ◽  
Author(s):  
Yulia R. Zakharova ◽  
Darya P. Petrova ◽  
Yuri P. Galachyants ◽  
Maria V. Bashenkhaeva ◽  
Maria I. Kurilkina ◽  
...  

2021 ◽  
Vol 19 (1) ◽  
pp. 260-271
Author(s):  
D. Yu. Levin

120 years ago, on June 22 (June 9 old style), 1901 the Committee on construction of the Trans-Siberian Railway approved final decision on the location of the route of Circum-Baikal Railway (CBR).This railway is a monument to the heroic construction of the Trans-Siberian Railway. At the beginning of 20th century, the whole world followed its construction: someone with a shudder, someone with curiosity. The main goal was defined by the urgent need to connect the Central part of Russia and the Far East. Hence, there was an insurmountable natural obstacle on the way: the largest lake in the world. Today the CBR is an architectural reserve, englobing a huge number of engineering structures. Many of them are still unique. Prospecting work on Lake Baikal lasted for 13 years. The lake is surrounded by mountains, 300 tributaries from different rivers flow into it. So laying a railway track was an extremely difficult task, Russian engineers have brilliantly coped with.


2021 ◽  
Author(s):  
Purificacion Lopez-Garcia ◽  
Guillaume Reboul ◽  
Gwendoline David ◽  
Ludwig Jardillier ◽  
Nataliia Annenkova ◽  
...  

<p>Understanding how abiotic and biotic factors influence microbial community assembly and function is crucial to understand ecological processes and predict how communities will respond to environmental change. Lake Baikal (Russian Federation) is the oldest, deepest and most voluminous freshwater lake on Earth, resembling in several respects sea environments. It thus offers a unique opportunity to test the effect of horizontal versus vertical gradients in community structure. Since climate change is rapidly affecting Siberia and Lake Baikal, this information can be useful both, as a reference for future monitoring of the lake and to help predictions about how local communities change as a function of environmental parameters. In order to address these questions, in 2017, we carried out a comprehensive sampling of Lake Baikal water columns and sediments along a North–South latitudinal gradient (ca. 600 km) across the three major basins of the lake, from coastal to pelagic areas and from surface to the deepest zones (0.5 to 1450 m deep). We then applied metabarcoding approaches based on 16S and 18S rRNA gene amplicon sequencing to characterize the composition of microbial communities, in particular, both prokaryotes and eukaryotes in sediments and microbial eukaryotes (0.2-30 µm cell size) in plankton (65 samples from 17 water columns). As expected, depth had a strong significant effect on protist community stratification in the water column. The effect of the latitudinal gradient was marginal and no significant difference was observed between coastal and surface open water communities. Co-occurrence network analyses showed that epipelagic protist communities were significantly more interconnected than in the dark water column. Surprisingly, Baikal benthic communities (13 sites) displayed remarkable stability across sites and seemed not determined by depth or latitude. Comparative analyses with other freshwater, brackish and marine sediments confirmed the distinctness of Baikal benthic communities, which show some similarity to marine and hydrothermally-influenced systems likely owing to its high oligotrophy, depth and fault-associated seepage. Metagenomic analyses of sediment samples show a wide metabolic potential of Baikal benthos and highlight the relative importance ammonia-oxidizing archaea in upper sediment layers.</p>


Author(s):  
Peter Thomson

A Friday in July . . . Boston is a tangle of cranes and earthmovers, half-built flyovers and half-dug trenches and a huge steel snake slithering along the narrowest of paths through the chaos—Amtrak’s Lake Shore Limited, weaving its way through the city’s $15 billion highway construction project known as the Big Dig and heading westward toward Albany, Cleveland, and Chicago. We’ve said our last goodbyes to the family, hauled our backpacks into our two-person sleeping compartment, and finally, after weeks of ever-more frantic preparation, begun to feel the rhythm of the world rumbling slowly by beneath us, the rhythm of our lives for the next six months. The train picks up headway as it groans past the hallowed green walls of Fenway Park, home of the Boston Red Sox and the spiritual center of New England, the dense triple-decker blocks of the inner suburbs and the verdant lawns and oak groves of the outer suburbs. James and I sit across from each other, grinning slightly, both a little intoxicated by a cocktail of excitement, relief, and anxiety. Family, friends, work, school, daily antagonisms, and well-worn rituals are all receding physically if not yet mentally. Over the horizon ahead loom Alaska, the Pacific, Japan, Vladivostok, Lake Baikal, and 25,000 miles or so of who knows what else. But it’s no big deal, we tell ourselves. We’re heading home, just taking the long way. Just past dawn, west of Cleveland, we’re running two and a half hours late. Our sleeping car attendant, Fred, tells us that we lost time overnight to track repairs, slow-loading mail shipments, and freight trains. Once you start to lose a little time on this run, he says, you quickly end up losing a lot, because the tracks are owned by the freight companies, and their trains have priority. If an Amtrak train slips off schedule, it starts the kind of chain reaction of delays that have earned this train the nickname the Late Shore Limited. I ask Fred if we’re going to make our connection in Chicago. “Not if we keep stopping like this,” he says.


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