New and rare for the Omsk Priirtyschie species of algae from the reservoirs of Omsk

Synechococcus as an indicator of trophic status in the Cochin backwaters, west coast of India

Olyokma Nature Reserve, where we conducted our research, is in Eastern Siberia in the middle taiga zone in an area characterized by continuous permafrost. This is the only protected area in the region with a complete reserve regime, where there is no human activity. Here, we studied 14 different types of water bodies located along the Olyokma River valley, 13 of which were studied for the first time. For some of the studied water bodies, a high content of biogenic elements was noted, which may be associated with the characteristics of permafrost water bodies, which are under nutrient release from permafrost thaw. The concentration of several biogenic elements, including ammonium, nitrates and phosphates, increases in the water of the lakes toward the bottom of the river valley. In the composition of various communities of these water bodies, including both planktonic and non-planktonic, we identified 246 species and varieties of microalgae. The abundance and biomass of phytoplankton, as well as the number of species, decreased down the river valley. At the same time, at the upper stations there were more diatoms; while at the stations down the valley, green algae came to the fore; and even lower down, cyanobacteria prevailed. At the lower stations, the indicators of microalgae development were minimal. In accordance with the bioindicative properties of microalgae, a decrease in the trophic status of water bodies was noted down the river valley, which, in our opinion, is a characteristic feature of the waters of an undisturbed catchment basin in the permafrost area. This indicates that the studied aquatic ecosystem changes within a set of environmental and biological indicators, that is, it exists in natural conditions for this catchment basin. Research on the territory of Olyokma Nature Reserve allowed us to obtain information on natural transformation and removal of nutrients in permafrost catchments, while excluding the likelihood of anthropogenic impact on these processes.

It is shown that large-size zooplankton can be used as a natural filter in flow-through plants for reducing the trophic status of water bodies and improve water transparency. Experiments in Chistye Prudy pond in the period of blue-green algae blooming show large-size zooplankton to reduce phytoplankton biomass in the pond throughout the period of phytoplankton growth. Daphnia magna specimens (with a biomass of 92 to 3450 mg/l) in lothic ecosystems are found to reduce the biomass of dominating Anabaena spirodes blue-green algae when this biomass attains its maximum.

The regularities of the processes of production and decomposition in different aquatic ecosystems of the basins of the main rivers of the Ukrainian Polissya, including the Prypyat and Teteriv rivers, were investigated. The influence of environmental factors on the intensity of phytoplankton photosynthesis and respiration was determined. The trophic status of water bodies was assessed based on the intensity of photosynthesis and phytoplankton biomass. The succession state of water bodies and watercourses was clarified according to the ratio of production and decomposition processes.

Extraction of macrophyte community spatial variation allows to adapt the macrophyte biological index for rivers to the conditions of the middle Dnipro river

Methods of evaluating the trophic status of water bodies based on nitrogen- and phosphorus-containing compounds are analyzed. It is suggested that the trophic status of water bodies be evaluated using the total average annual concentrations of mineral and labile organic forms of phosphorus or nitrogen. It is emphasized that additional account of regeneration potential of these elements does not modify the trophic status of the Rybinsk Reservoir--it remains mesotrophic.

The research assesses the state of different types of lakes in specially protected natural areas of the Nizhny Novgorod Region and the anthropogenically disturbed territory of Nizhny Novgorod. The trophic status of water bodies was determined using the trophic status index (TSISD). It has been established that most of the lakes have eutrophic and mesotrophic status. The analysis of the species structure of zooplankton in water bodies has been carried out. The species richness of both lakes of the protected areas and urban lakes was high. Along with eurybiontic species, alien and rare species of zooplankton were identified. Significant differences in the indicators of the species structure were established, however, no critical values of the abundance, biomass, Shannon and Pielou indices were recorded. Most of the identified zooplankton species were indicative. On the basis of the Pantle-Bukk saprobity index in the Sladecek modification, the water quality class was established. The reservoirs were characterized by quality class IIIII (clean-moderately polluted water). In some lakes an excess of the maximum permissible concentrations of ammonium, nitrite, iron, manganese, copper, zinc, lead has been established. However, in general, in terms of a set of indicators, water bodies are in a satisfactory condition. In order to objectively assess the ecological state of aquatic communities, to predict possible changes and develop recommendations for the conservation of species diversity, it is important to carry out regular monitoring studies.

Оценка связи содержания хлорофилла и биогенных элементов в крупных равнинных водохранилищах

The freshwater mussel Giant Floater Pyganodon grandis is native to North America. This study documented Giant Floater distribution, age, growth, and mortality rates in eastern South Dakota, USA lakes and reservoirs. The trophic status of water bodies where Giant Floater were collected was also assessed. Live and dead Giant Floater shells were observed in 13 natural lakes and eight reservoirs in the Big Sioux, James, Minnesota, and Missouri River basins. No Giant Floater were collected from waters in the Red River basin. Trophic State Index levels in the water bodies containing Giant Floater ranged from 55.8 to 98.3. Mean values were nearly identical between lakes and reservoirs at 68.9 and 68.7, respectively. Giant Floater ages ranged from 4-to-11 years. Mean age was not significantly different between natural lakes and reservoirs, at 6.1 and 7.8 years, respectively (p = 0.054). Mean estimated length was not significantly different between lakes and reservoirs at 9.71 cm and 12.90 cm, respectively (p = 0.115). Similarly, mean growth coefficient (K) was not significantly different between lakes at 0.27 cm/year and reservoirs at 0.23 cm/year (p = 0.406). Mean annual mortality was 36.7% and was not significantly different between lakes and reservoirs (p = 0.054). A significant negative relationship was found between Giant Floater maximum age and natural lake trophic state (R2 = 0.394, p = 0.022), but no such relationship was observed in reservoirs. There were no significant linear relationships between growth, estimated length, instantaneous mortality, annual mortality, and the trophic state of natural lakes or reservoirs.

Measurement of water quality is always experience method advanced time by time. Advancing in method of water quality measurement directing to easier, faster and more valid technique. Beside parameters such as DO, BOD5, KMnO4that is always used to determine water quality, chlorophyll-a could be the one of parameters that is used to measure the healthy of water body. Chlorophyll-a is commonly used to measure trophic status of water body. Chlorophyll-a can be measured in easy, fast and valid technique. Therefore, chlorophyll-a could be used as practical methode in measurement of water quality. This research is ordered to find formulative correlation between chlorophyll-a with DO, BOD5, KMnO4. Knowing formula related among those parameters, we know the value of DO, BOD5, KMnO4 only by measure the value of chlorophyll-a. Based on this research formulative correlation between chlorophyll-a with DO, BOD5, KMnO4 is couldn�t be founded. But, from this research can be resumed that Gadjah Wong river trophyc status is mesotrophyc-eutrophyc

In the absence of annual research, information about the individual growth of species in ichitiocenoses become the basis for understanding eutrophication processes occurring in ecosystems. As example, vendace sharply reacts on any shifts in the trophic status of water bodies by changes in growth rates. The vendace is a commercial species and an object of monitoring in Lake Vishtynetskoe, it made it possible to accumulate sufficient amount of information necessary for a preliminary assessment of the stability of the lake’s ecosystem based on data of the individual specimen growth. Retrospective analysis of vendace growth data from 2012 to 2016 showed that during the period under review there are no significant interannual fluctuations, which may indirectly indicate stable environmental conditions. The observed interannual shifts in size and age characteristics are associated with fluctuations in recruitment abundance.

The roles of nitrogen (N) and phosphorus (P) as key nutrients determining the trophic status of water bodies are examined, and evidence reviewed for trends in concentrations of N and P species which occur in freshwaters, primarily in northern temperate environments. Data are reported for water bodies undergoing eutrophication and acidification, especially water bodies receiving increased nitrogen inputs through the atmospheric deposition of nitrogen oxides (NOx). Nutrient loading on groundwaters and surface freshwaters is assessed with respect to causes and rates of change, relative rates of change for N and P, and implications of change for the future management of lakes, rivers and groundwaters. In particular, the nature and emphasis of studies for N species and P fractions in lakes versus rivers and groundwaters are contrasted. This review paper primarily focuses on results from North America and Europe, particularly for the UK where a wide range of data sets exists. Few nutrient loading data have been published on water bodies in less developed countries; however, some of the available data are presented to provide a global perspective. In general, N and P concentrations have increased dramatically (>20 times background concentrations) in many areas and causes vary considerably, ranging from urbanization to changes in agricultural practices.

The studies were carried out with the integrated monitoring of the Ivankovo and Rybinsk reservoirs. The work is devoted to the assessment of long-term changes in the trophic status of water bodies under the influence of natural and anthropogenic influence. The studies combined two traditional methods of analysis. A layer-by-layer study of diatom complexes in bottom sediments and the determination of the taxonomic composition of phytoplankton in reservoirs were carried out. The saprobity index (S) was calculated for diatom complexes from sediments. A comparison was made with similar calculations for the species structure of phytoplankton complexes. Spatial and temporal heterogeneity of saprobization processes in reservoirs was confirmed.

Analysis is presented of many-year spectrometric data in the visible band of electromagnetic spectrum collected for the Don R., including the Tsimlyansk Reservoir in 2010–2013 with a period of ~15 days. An algorithm has been proposed for separating spectral brightness coefficient of the rising radiation from water into six categories. A nomenclature scale of the trophic status of water bodies has been constructed. The obtained scale coincides with the nomenclature scales constructed by chlorophyll a concentration for water bodies under different physiographic conditions. The unquestioning advantage of remote sensing methods for assessing water body (WB) trophic status is emphasized, i.e., the possibility to carry out real-time studies within minutes at high representativeness of the results with respect to the examined aquatic ecosystem.

The shifts in microbial interactions and gene expression caused by temperature and nutrient loading influence Raphidiopsis raciborskii blooms