scholarly journals Short Communication: Zooplankton as indicator of trophic status of lakes in Ilmen State Reserve, Russia

2021 ◽  
Vol 22 (3) ◽  
Author(s):  
Irina V. Mashkova ◽  
Anastasiya Kostryukova ◽  
Elena Shchelkanova ◽  
Viktor Trofimenko
Keyword(s):  
Trophic Status ◽  
Short Communication ◽  
Ecological Status ◽  
Taxonomic Composition ◽  
Zooplankton Biomass ◽  
Taxonomic Structure ◽  
The Status ◽  
Ilmen State Reserve ◽  
Chelyabinsk Region ◽  
Zooplankton Communities

Abstract. Mashkova IV, Kostryukova AM, Shchelkanova EE, Trofimenko VV. 2021. Short Communication: Zooplankton as indicator of trophic status of lakes in Ilmen State Reserve, Russia. Biodiversitas 22: 1448-1455. Zooplankton is a potentially powerful tool for assessing the trophic state of aquatic ecosystems. The current paper studied taxonomic composition and biomass of zooplankton communities in ten lakes within Ilmen State Reserve, Chelyabinsk region, Russia and identified the influence of trophic status on its formation. Integrated samples were taken from epilimnion in the summer of 2016-2019. Several criteria were used to determine trophic status: the taxonomic structure and biomass of zooplankton; some hydroecological indicators some hydroecological indicators and the Carlson index. The trophic status of the studied lakes, determined based on the zooplankton biomass, revealed that most of the lakes were in the status of mesotrophic. The number of zooplankton species in the lakes was 44 with Pleuroxus laevis, Bosmina longirostris, Simocephalus vetulus were the most numerous species in mesotrophic lakes; while Chaetonotus ploenensis, Keratella quadrata frenzeli, Leptodora kindti are rare. Zooplankton communities of Bolshoye Miassovo and Maloye Miassovo Lakes were characterized by high species diversity and considered as one of the most significant among the foothill lakes of the eastern slope of South Ural. The study reveals that hydroecological assessment of the ecological status is not exactly precise, as values are not stable and can change not only under the anthropogenic influence but also due to many natural abiotic environmental factors. The research shows that species composition and biomass of zooplankton communities could provide a more accurate assessment of the trophic status of water-bodies.

scholarly journals Peculiarities of transformation of phytoplankton of Zhytomir reserve

2020 ◽  
pp. 49-57
Author(s):  
Yu. Shelyuk ◽  
Keyword(s):  
Phytoplankton Biomass ◽  
High Speed ◽  
Trophic Status ◽  
Water Cycle ◽  
Taxonomic Composition ◽  
Water Levels ◽  
Phytoplankton Production ◽  
Taxonomic Structure ◽  
Blue Green Algae ◽  
Class Level

Stable functioning of the ecosystem of the Zhytomir reservoir, which is indicated by the absence of directed changes in the primary production over a long period, is pro­bably supported by the alterations of the algae groups at the level of their structure, by the high speed of incorporation of organic matter into the bio-water cycle, and by large areas of water levels. Over the last 10 years, the role of blue-green algae has decreased in the taxonomic composition of the phytoplankton of the Zhytomir reservoir, while the species richness of green, euglenic and golden ones has increased; there were minor alterations to the phytoplankton structure at the class level and more noticeable changes at the order, family, and birth levels. Over a period of almost ten years the species saturation of the genus Chlamydomonas Ehrenb., Euglena Ehrenb., Cyclotella Kützing., Peridinium Ehrenb. Generally, the generic coefficients and the saturation of species with intraspecific taxa increased (which was also observed for the small Denyshivske reservoir), whereas for large reservoirs of the Dnipro and Volga there is a tendency to simplify the taxonomic structure of phytoplankton with their age. Phytoplankton biomass indicators remained unchanged for almost ten years, however, there was a shift in biomass peaks from summer to autumn. The number of algae cells decreased. Phytoplankton alignment decreased. Inadequacy has been established in the trophic status of the Zhytomir Reservoir, determined by biomass and primary phytoplankton production. The higher trophic level, determined by the intensity of photosynthesis, is probably due to the predominance in the dominant complexes of small-cell highly productive species that support the high trophic status of aquatic ecosystems with relatively low phytoplankton biomass. At the present stage, there is a tendency to improve the water quality of the reservoir according to the saprobiological indicators of phytoplankton development in comparison with 2003–2007.

Cladoceran- and copepod-dominated zooplankton communities graze at similar rates in low-productivity lakes

1998 ◽  
Vol 55 (2) ◽  
pp. 414-422 ◽  
Author(s):  
Hélène Cyr
Keyword(s):  
Zooplankton Community ◽  
Grazing Rate ◽  
Taxonomic Composition ◽  
Zooplankton Biomass ◽  
Phytoplankton Assemblage ◽  
Different Types ◽  
The Difference ◽  
Zooplankton Communities ◽  
Copepod Biomass

Many studies suggest that the taxonomic composition of a zooplankton community should determine its grazing rate and selectivity for different types of particles. It is generally believed that copepod-dominated communities should (i) have lower grazing rates and (ii) consume larger particles than communities dominated by large cladocerans. I tested these hypotheses in situ by comparing zooplankton grazing in 19 communities from low-productivity lakes where the zooplankton ranged from >99% copepod biomass to >90% large cladoceran biomass (Holopedium gibberum, Daphnia spp.). The zooplankton grazed 1-14% of total chlorophyll per day and 0-17% of the chlorophyll in algae <35 µm per day. Grazing rates increased with increasing zooplankton biomass (r2 = 0.34, P < 0.01), but once the effect of zooplankton biomass was accounted for, similar grazing rates were found in copepod- and in cladoceran-dominated communities. The difference in grazing rates on small algae and on the whole phytoplankton assemblage, on the other hand, varied systematically with zooplankton taxonomic composition. Holopedium-dominated communities were most efficient at grazing algae <35 µm, Bosmina-dominated communities had similar grazing rates on algae <35 µm and on the whole phytoplankton assemblage, and copepod-dominated communities had similar or slightly higher grazing rates on the whole phytoplankton assemblage. Qualitative differences in grazing selectivity of different zooplankton taxa are observed in complex natural communities.

scholarly journals Zooplankton communities in three adjacent softwater lobelia lakes of slightly differentiated morphology and trophic state

2017 ◽  
Vol 17 (4) ◽  
pp. 207-214 ◽  
Author(s):  
Natalia Kuczyńska-Kippen ◽  
Piotr Klimaszyk ◽  
Ryszard Piotrowicz
Keyword(s):  
Species Diversity ◽  
Diversity Index ◽  
Ecological Status ◽  
Zooplankton Community ◽  
Taxonomic Structure ◽  
Environmental Predictors ◽  
Species Diversity Index ◽  
Zooplankton Community Structure ◽  
Lobelia Lakes ◽  
Zooplankton Communities

Abstract The paper presents the results of an investigation of physical-chemical features of water as well as rotifer and crustacean abundance and diversity measures, relating to the taxonomic richness and species diversity index, in three lobelia lakes differing in trophic status and morphometric features. The main purpose of this study was to establish the diversity of zooplankton communities in the open water area of lobelia lakes, including extracting species common for each lake and also to find environmental predictors which are responsible for the development of zooplankton communities. Despite the fact that the three studied lakes are of the same origin, located in the same vicinity and have generally similar environmental factors, zooplankton community structure revealed a great variation in reference to species diversity (only ca. 20% of the species were common for all lakes) and particularly in inhabiting species. Obrowo Lake had the most diverse assemblages of both rotifers and crustaceans compared to Modre and Pomysko lakes. In the taxonomic structure species that are rare for the Polish fauna, such as e.g. Holopedium gibberum and Heterocope appendiculata, occurred. Even though the examined lobelia lakes are ecosystems that undergo varying human-induced impacts, they still remain taxonomically very variable aquatic ecosystems, containing rare species of very high ecological status. The observed symptoms of deterioration of water quality, reflected in the zooplankton biocoenotic features, showed that the best conditions were attributed to Obrowo Lake in comparison with the two remaining lakes – Modre and Pomysko. Total nitrogen and chlorophyll a concentration were decisive for the distribution of zooplankton species in Pomysko and Obrowo lakes, while in case of Modre lake water reactivity and conductivity were of higher impact.

Grazing by Zooplankton and Its Relationship to Community Structure

1992 ◽  
Vol 49 (7) ◽  
pp. 1455-1465 ◽  
Author(s):  
Hélène Cyr ◽  
Michael L. Pace
Keyword(s):  
Community Structure ◽  
Water Temperature ◽  
Size Distribution ◽  
Grazing Rate ◽  
Food Concentration ◽  
Taxonomic Composition ◽  
Zooplankton Biomass ◽  
Substantial Portion ◽  
Zooplankton Size ◽  
Zooplankton Communities

Zooplankton can consume a substantial portion of the phytoplankton, but grazing rates are notoriously variable seasonally and among sites. We developed models relating grazing rates to characteristics of Zooplankton communities, food concentration, and water temperature. Grazing rates were measured in 30 Zooplankton communities that differed in biomass, size distribution, and taxonomic composition. Crustaceans grazed per day 2–21% of the chlorophyll in algae <35 μm, which is within the range of most grazing rates measured in other studies. Grazing rates were positively related to Zooplankton biomass and negatively related to food concentration, although much variation among communities remains unexplained (R2 = 0.19–0.35). Surprisingly, we could not detect a general relationship between Zooplankton size distribution and grazing rate. Communities dominated by large Zooplankton (mostly Daphnia and Diaphanosoma) did not tend to have higher grazing rates than communities dominated by small Zooplankton. Zooplankton taxonomic composition was significantly related to grazing rates but explained little variation among communities. Grazing rates calculated from published allometric equations were biased, usually overestimating phytoplankton removal by Zooplankton.

scholarly journals Phytoplankton as an indicator of the current ecological status of the Ob River

2021 ◽  
Vol 7 ◽  
pp. 573-591
Author(s):  
Natalya N. Barsukova ◽  
Olga P. Bazhenova ◽  
Larisa G. Kolesnichenko
Keyword(s):  
Species Composition ◽  
Trophic Status ◽  
Ecological Status ◽  
Taxonomic Structure ◽  
Phytoplankton Abundance ◽  
Ob River ◽  
Centric Diatoms ◽  
Dominant Complex ◽  
Irtysh River ◽  
The Irtysh River

The species composition, taxonomic structure, and the dominant complex of algae, and the distribution of phytoplankton abundance in the studied watercourse were identified based on data obtained for phytoplankton from the Ob River (from Tomsk to Salekhard) in summer 2019. Green algae (division Chlorophyta) make up the basis of the phytoplankton abundance in the river. The dominant complex is represented mainly by centric diatoms (genera Aula&#1089;oseira, Cyclotella, Stephanodiscus) and non-heterocyst forms of cyanoprokaryotes (genus Aphanocapsa). The numbers and biomass of phytoplankton gradually decrease downstream of the Ob River; below the confluence of the Irtysh River, the edge effect occurs: increase in the diversity and density of organisms at the boundaries of ecosystems. Compared to the previous studies, the proportion of green and euglena algae, and cyanoprokaryotes in the taxonomic spectrum of phytoplankton increased, the composition of the dominant complex enriched, including due to non-heterocyst forms of cyanoprokaryotes, and the trophic status of the river increased to the category of eutrophic waters.

scholarly journals Effects of thermocline deepening on lake plankton communities

2011 ◽  
Vol 68 (2) ◽  
pp. 260-276 ◽  
Author(s):  
Ariane Cantin ◽  
Beatrix E. Beisner ◽  
John M. Gunn ◽  
Yves T. Prairie ◽  
Jennifer G. Winter
Keyword(s):  
Taxonomic Composition ◽  
Zooplankton Biomass ◽  
Phytoplankton Production ◽  
Thermocline Depth ◽  
Turbulent Environments ◽  
Planktonic Food ◽  
Basin Scale ◽  
Zooplankton Communities ◽  
The Vertical Distribution ◽  
Plankton Communities

Theory predicts, and some evidence demonstrates that in lakes, the depth of the thermocline can have a large structural influence on the spatial distribution, and strongly influences the composition of plankton communities. However, experimental assessments of responses of the planktonic food web to thermocline depth have not yet been done at the whole-basin scale. We conducted an experiment wherein we artificially lowered the thermocline in an isolated basin of a three-basin lake, maintaining another isolated basin as a control. The vertical distribution and taxonomic composition of both phytoplankton and zooplankton were monitored throughout the summer months. Greater phytoplankton production, especially in the epilimnion, attributable mainly to increases in the chlorophytes was observed with thermocline deepening, but at the deepest thermoclines, production was limited. Total zooplankton biomass was unaffected by thermocline depth, suggesting top-down control by predators. Zooplankton biomass peaks were less pronounced in the manipulated basin, but tended to follow the thermocline whether at its normal position or as it was deepened. Zooplankton composition was significantly altered by large increases in densities of predatory cyclopoid copepods and rotifers; taxa commonly found in turbulent environments. Overall, both phytoplankton and zooplankton communities demonstrated important shifts in structure and composition in response to thermocline deepening.

scholarly journals Fatty acid composition and parasitism of European sardine (Sardina pilchardus) and European anchovy (Engraulis encrasicolus) populations in the northern Catalan Sea in the context of changing environmental conditions

2020 ◽  
Author(s):  
Sebastian Biton-Porsmoguer ◽  
Ricard Bou ◽  
Elsa Lloret ◽  
Manuel Alcaide ◽  
Josep Lloret
Keyword(s):  
Fatty Acid ◽  
Environmental Conditions ◽  
Total Lipid Content ◽  
Taxonomic Composition ◽  
The Body ◽  
Adjacent Area ◽  
Poor Condition ◽  
Lipid Dynamics ◽  
Phytoplankton Communities ◽  
The Status

AbstractThe status of sardine and anchovy populations in the northern Mediterranean Sea has been declining in recent decades. In this study, fatty acids and parasitism at different reproductive and feeding stages in these two species were assessed using specimens caught along the northern Catalan coast, in order to assess the links between lipid dynamics, reproduction and feeding in these two species, and to contribute towards an explanation of the potential causes of the current situation of the stocks. The results support the use of fatty acid levels as indicators of the body condition of sardine and anchovy at different reproductive and feeding stages, as well as that of the pelagic environmental conditions. In particular, the relatively low n-3 PUFA levels (which are crucial for reproductive success) found in spawning sardines compared to spawning anchovies indicate a poorer reproductive health status of sardine. By comparing the current total lipid content values with those recorded in other Mediterranean and North Atlantic areas, and, others from more than ten years ago, in the adjacent area of the Gulf of Lion, our study reveals the persistent poor condition of sardine and anchovy in the northern Catalan Sea. Furthermore, the low levels of diatom fatty acid markers observed throughout the spawning and non-spawning seasons in both sardine and anchovy, indicate a diet poor in diatoms. Moreover, the results indicate that it is very unlikely that parasitism is a significant factor in the decline in condition of sardine and anchovy in the northern Catalan Sea. In fact, the results suggest that the current poor condition of sardine and anchovy in the northern Catalan Sea has been exacerbated by a decrease in plankton productivity and/or a shift in the taxonomic composition of phytoplankton communities, adding to the ongoing effects of overfishing.

scholarly journals A Three-Dimensional Coupled Hydrodynamic-Ecological Modeling to Assess the Planktonic Biomass in a Subalpine Lake

2021 ◽  
Vol 13 (22) ◽  
pp. 12377
Author(s):  
Wen-Cheng Liu ◽  
Hong-Ming Liu ◽  
Rita Sau-Wai Yam
Keyword(s):  
Water Quality ◽  
Sensitivity Analysis ◽  
Ecological Model ◽  
Three Dimensional ◽  
Ecological Status ◽  
Coupled Model ◽  
Zooplankton Biomass ◽  
Subalpine Lake ◽  
Depth Water ◽  
Temperature Water

In this study, a coupled three-dimensional hydrodynamic-ecological model was developed to comprehensively understand the interaction between the hydrodynamics and ecological status of a lake. The coupled model was utilized to explore the hydrodynamics, water quality, and ecological status in an ecologically rich subalpine lake (i.e., Tsuei-Feng Lake (TFL), located in north-central Taiwan). The measured data of water depth, water temperature, water quality, and planktonic biomass were gathered to validate the coupled model. The simulated results with a three-dimensional hydrodynamic and water quality-ecological model reasonably reproduced the variations in observed water depth, water temperature, water quality, and phytoplankton and zooplankton biomass. Sensitivity analysis was implemented to determine the most influential parameter affecting the planktonic biomass. The results of sensitivity analysis indicated that the predation rate on phytoplankton (PRP) significantly affects the phytoplankton biomass, while the basal metabolism rate of zooplankton (BMZ) importantly affects the zooplankton biomass. Furthermore, inflow discharge was the most important environmental factor dominating the phytoplankton and zooplankton biomass of TFL. This implies that the runoff in the catchment area caused by rainfall and the heavy rainfall induced by climate change may affect the planktonic biomass of the lake.

scholarly journals Taxonomic composition and biodiversity of the gut microbiome from patients with irritable bowel syndrome, ulcerative colitis, and asthma

2022 ◽  
Vol 25 (8) ◽  
pp. 864-873
Author(s):  
A. Y. Tikunov ◽  
A. N. Shvalov ◽  
V. V. Morozov ◽  
I. V. Babkin ◽  
G. V. Seledtsova ◽  
...  
Keyword(s):  
Ulcerative Colitis ◽  
Irritable Bowel Syndrome ◽  
Gut Microbiota ◽  
Gut Microbiome ◽  
Taxonomic Composition ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Taxonomic Structure ◽  
Opportunistic Bacteria ◽  
Irritable Bowel

To date, the association of an imbalance of the intestinal microbiota with various human diseases, including both diseases of the gastrointestinal tract and disorders of the immune system, has been shown. However, despite the huge amount of accumulated data, many key questions still remain unanswered. Given limited data on the composition of the gut microbiota in patients with ulcerative colitis (UC) and irritable bowel syndrome (IBS) from different parts of Siberia, as well as the lack of data on the gut microbiota of patients with bronchial asthma (BA), the aim of the study was to assess the biodiversity of the gut microbiota of patients with IBS, UC and BA in comparison with those of healthy volunteers (HV). In this study, a comparative assessment of the biodiversity and taxonomic structure of gut microbiome was conducted based on the sequencing of 16S rRNA genes obtained from fecal samples of patients with IBS, UC, BA and volunteers. Sequences of the Firmicutes and Bacteroidetes types dominated in all samples studied. The third most common in all samples were sequences of the Proteobacteria type, which contains pathogenic and opportunistic bacteria. Sequences of the Actinobacteria type were, on average, the fourth most common. The results showed the presence of dysbiosis in the samples from patients compared to the sample from HVs. The ratio of Firmicutes/Bacteroidetes was lower in the IBS and UC samples than in HV and higher the BA samples. In the samples from patients with intestinal diseases (IBS and UC), an increase in the proportion of sequences of the Bacteroidetes type and a decrease in the proportion of sequences of the Clostridia class, as well as the Ruminococcaceae, but not Erysipelotrichaceae family, were found. The IBS, UC, and BA samples had signif icantly more Proteobacteria sequences, including Methylobacterium, Sphingomonas, Parasutterella, Halomonas, Vibrio, as well as Escherichia spp. and Shigella spp. In the gut microbiota of adults with BA, a decrease in the proportion of Roseburia, Lachnospira, Veillonella sequences was detected, but the share of Faecalibacterium and Lactobacillus sequences was the same as in healthy individuals. A signif icant increase in the proportion of Halomonas and Vibrio sequences in the gut microbiota in patients with BA has been described for the f irst time.

scholarly journals Short Communication: Biodiversity of weeds in Ilmen State Reserve, Russia

2018 ◽  
Vol 19 (1) ◽  
pp. 106-111
Author(s):  
IRINA V. MASHKOVA ◽  
TATYANA G. KRUPNOVA ◽  
ANASTASIYA M. KOSTRYUKOVA ◽  
NIKITA E. VLASOV
Keyword(s):  
Species Diversity ◽  
Plant Species ◽  
Human Exposure ◽  
Short Communication ◽  
Vegetation Period ◽  
Pine Forest ◽  
South Urals ◽  
Natural Landscape ◽  
Ilmen State Reserve ◽  
Synanthropic Flora

Mashkova IV, Krupnova TG, Kostryukova AM, Vlasov NE. 2018. Short Communication: Biodiversity of weeds in Ilmen State Reserve, Russia. Biodiversitas 19: 106-111. Weeds are a synanthropic flora. Human exposure to the natural landscape leads to the spread of synanthropic plant species, so weeds begin to occupy a significant place in the structure of ecosystem biodiversity. The aim of this study was to investigate the weeds biodiversity structure and to assess the extent of invasion of weeds into the territory of the Ilmen State Reserve in South Urals, Russia. This paper presents the results of study of weeds during the vegetation period in 2013–2017. Fifty one species of weeds distributed in four genera and six families were found on the territory of the Southern Forestry of the Ilmen State Reserve. Besides, the differences between species diversity of weeds on three types of roads (gravel, earth and foot) and on two types of forests (birch and pine) were also discovered in this study . The greatest degree of invasion was discovered for foot roads. It was noted that pine forest is the most resistant the invasion of weeds.

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