scholarly journals PARASITOCENOSES OF FISH IN RIVERS AND RESERVOIRS OF THE RYAZAN REGION

2021 ◽  
pp. 394-400
Author(s):  
A. Novak ◽  
M. Novak
Keyword(s):  
Water Body ◽  
Higher Plants ◽  
Wide Distribution ◽  
Biological Cycle ◽  
Opisthorchis Felineus ◽  
Endemic Focus ◽  
Eutrophic Water ◽  
Pra River ◽  
Tylodelphys Clavata ◽  
Rivers And Reservoirs

The wide distribution of trematodes and other helminths with a complex biological cycle in the reservoirs of the Ryazan Region indicates an increase in the level of their eutrophication. We performed a complete helminthological study of the ide (25 copies), roach (21 copies), and perch (29 copies) according to K.I. Skryabin. Taking into account complex hydrological indicators (species composition of higher plants, microphytes, fauna of hydrobionts and their parasites), the Pra River is a dystrophic water body, the Pronya River is an eutrophic water body, and the Novomichurinsk Reservoir is a hypertrophic water body. Parasites of Pra River were represented by nine species, the Pronya River by four species, and the Novomichurinsky Reservoir by six species. Trematodes dominate in all reservoirs of the Ryazan Region. We found an endemic focus of opisthorchiasis in the Pra River where the infection of the ide with metacercarias Opisthorchis felineus reaches 38–50% with an invasion intensity of up to 70 specimens. A number of species of trematodes (Ichthyocotylurus spp., Paracoenogonimus ovatus, Diplostomum spp., Posthodiplostomum spp., Tylodelphys clavata) and cestodes (Ligula intestinalis) should be considered as indicators for assessing an increase in concentration of dissolved biogenic substances in the water bodies. There is a direct correlation between the infection of fish with the above species of trematodes and cestodes (tapeworms) being indicators of the invasion intensity and the degree of eutrophication of the reservoirs.

scholarly journals Phytoplankton Community Investigation and Water Quality Assessment of M River in winter in Shijiazhuang City

2021 ◽  
Vol 267 ◽  
pp. 01035
Author(s):  
Ziqi Zhang ◽  
Lei Yang ◽  
Dongxu Han ◽  
Hongyan Shen
Keyword(s):  
Water Quality ◽  
Species Diversity ◽  
Water Body ◽  
Phytoplankton Community ◽  
Diversity Index ◽  
Water Quality Assessment ◽  
Species Diversity Index ◽  
Wiener Diversity Index ◽  
Eutrophic Water ◽  
Evenness Index

An investigation of phytoplankton community and water quality for M River was conducted in December 2019.The results showed that 38 species of phytoplankton belonging to 6 phyla and 26 genera were collected. Among them, Bacillariophyta is the richest species, which accounted for 34.21%, followed by Cyanophyta with 26.32% and Chlorophyta with 28.95%. The density of phytoplankton was 63.0*106 inds/L which indicated as eutrophic water body. The highest density was Bacillariophyta, accounting for 51.03%. The Shannon-Wiener diversity index (H’) varied from 1.34 to 2.24, the Margalef Species diversity index (d) varied from 2.71 to 3.85, and the Pielou evenness index (J) varied from 0.38 to 0.67. According to the integrative analysis results of H’, d and J, M River water quality belongs to oligo-polluted, but individual sites belong to meso-polluted.

Water Solubility Enhancement of DDT by Humic Acid and Extracellular Organic Matter of Aquatic Algae

2012 ◽  
Vol 518-523 ◽  
pp. 565-568 ◽  
Author(s):  
Hua Ma ◽  
Fu Yi Cui ◽  
Zhi Wei Zhao ◽  
Zhi Quan Liu ◽  
Dong Mei Liu
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Water Body ◽  
Sampling Method ◽  
Water Solubility ◽  
Solubility Enhancement ◽  
Absorption Coefficients ◽  
Solution Ph ◽  
Eutrophic Water ◽  
Extracellular Organic Matter

The water solubility enhancement of 2,4´-DDT and 4,4´-DDT by humic acid and extracellular organic matter released from Microcystis aeruginosa was investigated by a ingenious sampling method and increasing apparent solute solubilities. Water solubility enhancements of the two DDT isomerizes by both humic acid and extracellular organic matter at the solution pH 7-11, and their solubilities increased with the increase of pH. Absorption coefficients Ciw (2,4´-DDT and 4,4´-DDT) increased with the increase of pH for HA and EOM, but Ciw for EOM are about two times than for HA at same TOC concentrations. The results suggested that more attentions should be paid to the enhancement of organic chemicals by EOM, especially in eutrophic water body where an increasing algae population usually appears, and the enhancement of DDT solubility by EOM may increase the risk of pesticide residues to organisms.

Removal Properties of Nitrogen and Phosphorous in Eutrophic Water with Periphyton Attached by Artificial Substrate

2011 ◽  
Vol 340 ◽  
pp. 480-486
Author(s):  
Ding Long Li ◽  
Hong Lu ◽  
Qian Chen ◽  
Jian Ying Chao ◽  
Xiang Ji Kong ◽  
...  
Keyword(s):  
Water Depth ◽  
Water Body ◽  
Removal Rate ◽  
Chemical Properties ◽  
Water Velocity ◽  
New Thought ◽  
Chl A ◽  
Eutrophic Water ◽  
Nitrogen Nutrients ◽  
Depth Water

Removal properties are researched and discussed of algae and nitrogen & phosphorus nutrients with periphyton by assembled substrate in lake-based eutrophic water body, including impacts on removal effects of several physical & chemical properties as water depth, water velocity, DO, temperature and PH. The results show that: the removal rate of NH4-N, other nitrogen nutrients, phosphorus nutrients and Chl-a were 96%, 40%, 80%, 65% respectively. With the growth of water velocity(from 0 to 200L/h ), the removal of Chl-a, TP, TDP increased to a certain extent（Chl-a: from 63.63% to 67.66%; TP:from 76.15% to 85.13%;TDP:from 80.10% to 88.44%）,and that of TN,TDN and NO3-N decreased to different extents（TN: from 45.19% to 31.97%; TDN: from 42.81% to 28.77%; NO3-N: from 38.11% to –5.26%）, but that of NH4-N and PO4-P altered little(NH4-N：from 96.80% to 95.94%；PO4-P：from 85.38% to 87.02%). It will provide reference for recovery and re-contribution of destroyed Eco-system, and a new thought for treatment in eutrophical lakes.

Study on saccharification techniques of alga waste harvested from a eutrophic water body for the transformation of ethanol

2017 ◽  
Vol 101 ◽  
pp. 311-315
Author(s):  
Shou-Te Chen ◽  
Yung-Pin Tsai ◽  
Jian-Hao Ciou ◽  
Zhi-Yuan Huang ◽  
Wei-Chih Lin ◽  
...  
Keyword(s):  
Water Body ◽  
Eutrophic Water

Feeding of Tench Tinca tinca (Cyprinidae) in a Small Eutrophic Water Body

2018 ◽  
Vol 58 (4) ◽  
pp. 545-551
Author(s):  
V. V. Bezmaternykh ◽  
G. Kh. Shcherbina
Keyword(s):  
Water Body ◽  
Tinca Tinca ◽  
Eutrophic Water ◽  
Tench Tinca Tinca

scholarly journals Frond Architecture of The Rootless Duckweed Wolffia Globosa

2021 ◽  
Author(s):  
Jingjing Yang ◽  
Xuyao Zhao ◽  
Gaojie Li ◽  
Shiqi Hu ◽  
Hongwei Hou
Keyword(s):  
Developmental Stages ◽  
Higher Plants ◽  
Three Dimensional ◽  
Wide Distribution ◽  
Detailed Knowledge ◽  
Mesophyll Cells ◽  
Reduced Body ◽  
Ideal System ◽  
Undifferentiated Cells ◽  
Vacuolated Cells

Abstract Background: The plant body of duckweed species has undergone reduction and simplification from the ancient Spirodela species towards more-derived Wolffia species. Among the five duckweed genera, Wolffia members are rootless and represent the smallest and most-reduced species. However, we lack detailed knowledge about their structure. Results: We conducted a comprehensive study of the morphology and anatomy of Wolffia globosa, the only Wolffia species in China. We first used X-ray microtomography imaging to reveal the three-dimensional and internal structure of the W. globosa frond. This showed that new fronds rapidly budded from the hollow reproductive pocket of the mother fronds and that several generations at various developmental stages could coexist in a single W. globosa frond. Using light microscopy, we observed that the meristem area of the W. globosa frond was located at the base of the reproductive pocket and composed of undifferentiated cells that continued to produce new buds. A single epidermal layer surrounded the W. globosa frond, and the mesophyll cells varied from small and dense palisade-like parenchyma cells to large, vacuolated cells from the ventral to the dorsal part. Furthermore, W. globosa fronds contained all the same organelles as other angiosperms; the most prominent organelles were chloroplasts with abundant starch grains. Conclusions: Our study revealed that the reproductive strategy of W. globosa plants enables the rapid accumulation of biomass and the wide distribution of this species in various habitats. Despite their reduced body plan and size, the simplicity of the W. globosa frond might be overestimated. We propose that W. globosa plants are not only suitable for the study of structural reduction in higher plants, but also an ideal system to explore fundamental developmental processes of higher plants that cannot be addressed using other model plants.

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