Zooplankton communities of the lena river delta (Siberia, Russia)

© SGEM2016.The article represents the current status of zooplankton communities in different types of water bodies of the Lena River Delta (The Republic of Sakha (Yakutia)), Eastern Siberia, Russia. Zooplankton species compositions have been investigated in each of thermokarst and polygonal lakes of the areas of study. The diversity of zooplankton species was clearly dominated by representatives of the type of Rotifera. On the other hand, Cladocera and Copepoda species were represented approximately in equal proportions. The abundance of Rotifera was higher in zooplankton communities. The zooplankton abundance was determined by rotifers, the biomass – by Copepods. The main species complex consisted of Kellicottia longispina, Keratella cochlearis, Conochilus unicornis, Eudiaptomus graciloides, Cyclopos genera and juvenile cladocerans. The reservoirs were characterized as clean or moderately polluted and oligosaprobic with deviation in β-mezosaprobic zone. The communities were dominated by widespread zooplankton species where Holarctic and Palearctic organisms were presented approximately in equal proportions. According to biotopic distribution eurytopic species represent half of all the specific composition, planktonic and littoral species we re presented in equal proportions. Zooplankton communities in thermokar st lakes we re more similar to themselves than the thermokarst and polygonal waterbodies’ zooplankton communities. There wa s clearly seasonality in dominance of zooplankton species and their association with a type of the water body

Zooplankton communities of the lena river delta (Siberia, Russia)

© SGEM2016.The article represents the current status of zooplankton communities in different types of water bodies of the Lena River Delta (The Republic of Sakha (Yakutia)), Eastern Siberia, Russia. Zooplankton species compositions have been investigated in each of thermokarst and polygonal lakes of the areas of study. The diversity of zooplankton species was clearly dominated by representatives of the type of Rotifera. On the other hand, Cladocera and Copepoda species were represented approximately in equal proportions. The abundance of Rotifera was higher in zooplankton communities. The zooplankton abundance was determined by rotifers, the biomass – by Copepods. The main species complex consisted of Kellicottia longispina, Keratella cochlearis, Conochilus unicornis, Eudiaptomus graciloides, Cyclopos genera and juvenile cladocerans. The reservoirs were characterized as clean or moderately polluted and oligosaprobic with deviation in β-mezosaprobic zone. The communities were dominated by widespread zooplankton species where Holarctic and Palearctic organisms were presented approximately in equal proportions. According to biotopic distribution eurytopic species represent half of all the specific composition, planktonic and littoral species we re presented in equal proportions. Zooplankton communities in thermokar st lakes we re more similar to themselves than the thermokarst and polygonal waterbodies’ zooplankton communities. There wa s clearly seasonality in dominance of zooplankton species and their association with a type of the water body

Specific structural features of zooplankton of polygonal pond (Lena river delta, russia, arctic)

© SGEM2017. This study is devoted to the investigation of zooplankton biodiversity and their adaptation to the short growing season of polygonal pond, located in the largest Arctic delta - the delta of the Lena River (Republic of Sakha (Yakutia), Russia). Samples were obtained within the Russian-German project "Expedition Lena" (August 2013, June-August 2014). Investigated polygonal pond with thickets of macrophytes shallow, well-oxygenated, weakly mineralized with low conductivity, slightly alkaline pH. The pond freezes in winter completely and flooded by river waters in the spring floods. Totally, 39 zooplankton species and forms were revealed, almost half of which belonged to the type Rotifera. The fauna was typical for zooplankton of arctic shallow ponds. Cyclops strenuus (Fischer, 1851), Daphnia pulex (Leydig, 1860), Kellicottia longispina (Kellicott, 1879), Camptocamptus glacialis (Lilljeborg, 1902) and juvenile Copepoda prevailed by frequency of occurrence. Structure-forming zooplankton species were determined by the morphology of the pond. Copepoda and Cladocera appear to dominate in terms of abundance and biomass. The average values of zooplankton abundance and biomass totally accounted for 59.4 thousand ind./m 3 and 1149.3 mg/m 3 respectively. We revealed and recorded the differences in the species composition and seasonal changes in the specific structure of zooplankton. Recently appeared zooplankton species in the Lena Delta have been observed in the studied polygonal pond (Paracyclops fimbriatus (Fischer 1853), and others). Water quality assessment according to Shannon index and saprobity index defined the β-mesosaprobic (1.6) and oligotrophic (1.1 g/m 3 ) levels and described the studied pond as moderately polluted (2.6 bits / ind.) with relatively low diversity of zooplankton

Preliminary studies of zooplankton communities and assesment of the ecological status of lake suturuokha (Ne Siberia, Russia)

© SGEM2017. Lake Suturuokha (69'06 "N, 145'23" E) is a unique lake within the Indigirka River basin, which is located on the border of the forest-tundra and taiga in the north of the Republic of Sakha (Yakutia). Formed due to the influence of glaciers of several glaciations in the late Pleistocene, the lake has a large area (69 km 2 ) and comparatively shallow depths (2 - 2.5 m). Because of its unusual genesis and low study, the lake is of great interest to scientists. In August 2015, in the framework of the research expedition, an assessment of the current ecological conditions of Lake Suturuokha was implemented, in the course of which hydro-biological samples were selected from 16 different points located in different biotopes of the lake’s water area. According to the research conducted, Lake Suturuokha can be referred to as highly productive due to the active blooming blue-green and green algae and a mass accumulation of effipium of Daphnia middendorffiana (Fischer, 1851), Cladocera. 53 species and forms in species diversity of zooplankton community were revealed; of these, 31 were Rotifera, 12 Cladocera and 11 Copepoda. High frequency indicators belonged to the rotifers Brachionus angularis (Gosse, 1851), Collotheca pelagica (Rousselet, 1893), Kellicotia longispina (Kellicot, 1879), as well as the cladocera Daphnia middendorfiana (Fischer, 1851) and the juvenile Copepoda. 76.6 % of the total zooplankton abundance included rotifers, 21.7 % and 1.7 % of the abundance involved Copepod and Cladocera. The average value of the zooplankton abundance of the lake was 35.10 thousand ind./m 3 . Biomass of zooplankton of the lake Suturuokha on the average had a value of 295.2 mg/m 3 . 64.1 % of it were Cladocera, especially large D. middendorfiana. 36.7 % of the biomass contained Copepoda, 1.7 % - of rotifer biomass. Mass clusters of Cladocera efippia, formed primarily by D. middendorphiana, were discovered. Estimators of Shannon’s index and saprobity index defined that the lake was located on the border to pure and moderately polluted waters and had oligosaprobic level (the average values 2.57 and 1.47 accordingly). The prevalence of littoral species (44 %) and cosmopolitan species (53 %) in zooplankton was explained by the small depths of the lake. However, quantitatively, the dominant structure of zooplankton was cold-water species

Environmental and climatic factors influencing the distribution of sub-fossil cladocerans in thermokarst lakes in northeastern Siberia, Russia

Surface sediments of thermokarst lakes along the temperature gradient were sampled in northwestern Siberia. The lakes were distributed through three environmental zones: typical tundra, southern tundra and forest-tundra, which were all situated within the continuous permafrost zone. Our investigation showed that the cladoceran communities in the lakes of the region are represented by diverse, abundant communities as reflected by the taxonomic richness and high diversity indices. The differences in the cladoceran assemblages were related to the limnological and geographical position, vegetation type, climate and water chemistry. The constrained redundancy analysis (RDA) indicated that the TJuly, water depth and both sulphate (SOf ~) and silicium (Si4*) concentrations statistically significant (p < 0.05) explained the variance in the cladoceran assemblage

About littoral macrozoobenthos communities of Cheboksary reservoir

This work analyzed the qualitative and quantitative characteristics of zoobenthos communities of coastal shallow zone at Cheboksary reservoir during the vegetation period of 2014. In this regard, three sampling stations were provided, differing by soil, biotic and abiotic environmental conditions. Each station consists of two sections of reservoir shallow coastal area, where the research was performed: directly in the water line area, as well as at various depths of shallow water. The species composition of macrozoobenthos, the number and biomass indicators, the leading groups and organism taxa were specified. 41 taxa of aquatic invertebrates were revealed, 17 of which (41.5% of the total amount) occurred in the water line area and in littoral zone. The observed taxa belong to Mollusca, Arthropoda, Plathelminthes, Annelida types. The greatest species diversity was observed among insects (mainly Diptera representatives), as well as among mollusks. The high amount and biomass indices were observed among gastropods and bivalves, the invasive species Lithoglyphus naticoides (Pfeiffer, 1828), Dreissena polymorpha (Pallas, 1771), which play an important role in the communities of zoobenthos of the Volga-Kama reservoir system. High biomass indices were observed among gastropods, especially Viviparus viviparus (L., 1758). The water edge zone with high levels of biomass had a large amount of pond snails Lymnaea auricularia (L., 1758) and L. stagnalis (L., 1758) and the shallow water zone had a large amount of Unio longirostris (Rossmaessler, 1836) bivalves

Zooplankton spatial distribution in thermokarst lake of The Lena River Delta (Republic of Sakha (Yakutia)).

This paper presents the study results of zooplankton spatial distribution at the thermokarst lake of the Lena river delta (Republic of Sakha (Yakutia)). The species composition of zooplankton revealed 40 species: 25 species of Rotifera type, 8 species of Cladocera suborder and 7 species of Copepoda subclass. The basic complex of the following species is revealed: rotifers Conochilus unicornis (Rousselet, 1892), Kellicotia longispina (Kellicot, 1879), Keratella cochlearis (Gosse, 1851), crustaceous cladocerans: r. Bosmina, copepods: Maranaebiotus brucei (Richard, 1898), Leptodiaptomus angustilobus (Sars, 1898), Eudiaptomus graciloides (Lilljeborg, 1888). The zooplankton number of reservoir was determined by rotifers (69.1% of the total), the average value was 178,2 ± 21,6 thousand individuals/m3. The biomass of zooplankton was represented by major species of copepods (74.4% of the total biomass), the average value is equal to 1184.1 mg/m3. 2 peaks of zooplankton quantitative indicators are revealed. The differences of the spatial distribution of species are represented within the water area of the reservoir: in the polygonal part of the lake, in the littoral and the pelagic thermokarst part of the reservoir. According to the ecological state of the reservoir evaluation this lake is characterized is a clean and oligosaprobic one. In accordance to zoogeographical, ecological and faunal characteristics the zooplankton is presented mainly by cosmopolitan, eurytopic and littoral species

Adenine and guanine recognition of stop codon is mediated by different N domain conformations of translation termination factor eRF1

Positioning of release factor eRF1 toward adenines and the ribose-phosphate backbone of the UAAA stop signal in the ribosomal decoding site was studied using messenger RNA (mRNA) analogs containing stop signal UAA/UAAA and a photoactivatable cross-linker at definite locations. The human eRF1 peptides cross-linked to these analogs were identified. Cross-linkers on the adenines at the 2nd, 3rd or 4th position modified eRF1 near the conserved YxCxxxF loop (positions 125–131 in the N domain), but cross-linker at the 4th position mainly modified the tripeptide 26-AAR-28. This tripeptide cross-linked also with derivatized 3′-phosphate of UAA, while the same cross-linker at the 3′-phosphate of UAAA modified both the 26–28 and 67–73 fragments. A comparison of the results with those obtained earlier with mRNA analogs bearing a similar cross-linker at the guanines indicates that positioning of eRF1 toward adenines and guanines of stop signals in the 80S termination complex is different. Molecular modeling of eRF1 in the 80S termination complex showed that eRF1 fragments neighboring guanines and adenines of stop signals are compatible with different N domain conformations of eRF1. These conformations vary by positioning of stop signal purines toward the universally conserved dipeptide 31-GT-32, which neighbors guanines but is oriented more distantly from adenines

Present-day Risk of Occasional Extreme Hydrological and Hydrogeological Events

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive

Sustainable development of territories based on the integrated use of industry, resource and environmental potential

Purpose: Attention to the problems of social and economic development of rural areas by Government authorities, economists and the scientific community was mainly theoretical or sometimes targeted practical in nature. Design/Methodology/Approach: At the same time, rural poverty and high unemployment rate, worsening demographic situation, reducing network of institutions of social infrastructure in rural areas, which together have a negative impact on the reproduction of labor resources, lower production volumes and high migration rates have always been the problems of rural development in the country. Findings: Overall, sustainable development of rural areas characterizes, on the one hand, external major natural resource constraints that form a distant prospect, and on the other hand, determine the possibilities of social and economic development of rural communities, economic entities, diversification of the territory's economy, the formation of new activities and environmental engineering. This is a very wide range of problems, which are currently considered from different perspectives in Russia and in several countries of the world. Practical implications: The article discusses the problems of economic development of rural areas as the main factor in ensuring the sustainable development of rural areas of the agrarian regions of Russia. Originality/Value: The authors define the core resources for development of the rural areas in the region, provide an overview of agribusiness and tourism industry clusters, reveling their points of growth, cluster sales channels, tourism and recreation development.peer-reviewe