scholarly journals Omnivorous Carp (Carassius gibelio) Increase Eutrophication in Part by Preventing Development of Large-Bodied Zooplankton and Submerged Macrophytes

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1497
Author(s):  
Vladimir Razlutskij ◽  
Xueying Mei ◽  
Natallia Maisak ◽  
Elena Sysova ◽  
Dzmitry Lukashanets ◽  
...  
Keyword(s):  
Aquatic Ecosystems ◽  
Submerged Macrophytes ◽  
Benthic Algae ◽  
Plankton Community ◽  
Prussian Carp ◽  
Omnivorous Fish ◽  
Outdoor Experiment ◽  
Nitrogen Concentrations ◽  
Lower Biomass

Fish, being an important consumer in aquatic ecosystems, plays a significant role by affecting the key processes of aquatic ecosystems. Omnivorous fish consume a variety of food both from pelagic and benthic habitats and may directly or indirectly affect the plankton community as well as the lake trophic state. We conducted a 72-day outdoor experiment in mesocosms with and without Prussian carp (Carassius auratus) to evaluate the effect of this often-stocked omnivorous fish on the plankton community and water quality. We found that the presence of fish increased the biomass of planktonic algae, total and inorganic suspended solids, leading to decreased light intensity in the water and a lower biomass of benthic algae. Fish also prevented development of submerged macrophytes and the establishment of large-bodied zooplankton. However, the fish did not increase nitrogen concentrations and even was lowered total phosphorus levels, in part due to nutrient storage in the fish. We conclude that stocking of Prussian carp should be avoided, or removed where stocked and abundant, to obtain good ecological quality of shallow lakes, characterized by clear water and high abundance of macrophytes.

On methodological approaches to the improvement of surface water bodies and target indicators of the natural waters’ quality

2021 ◽  
Vol 27 (1) ◽  
pp. 6-14
Author(s):  
V. Zaslonovsky ◽  
◽  
N. Sharapov ◽  
M. Bosov ◽  
◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Natural Water ◽  
Aquatic Ecosystems ◽  
Natural Waters ◽  
Water Bodies ◽  
Surface Water Bodies ◽  
Methodological Approaches ◽  
Natural Water Bodies

The paper is devoted to the development of proposals concerning the improvement of surface water bodies and the appointment of target indicators of the natural waters’ quality. The paper considers a variety of problems of preserving, restoring and improving the quality of natural surface waters: from regional features of the formation of natural water composition, to differences in the requirements for the quality of water consumed. The object of the study is the qualitative indicators of the waters of natural water bodies, and the subject of the study is the methodological approaches to the normalization of these indicators. The purpose of the work is to identify the main shortcomings in the domestic system of rationing the quality of natural waters, and to form appropriate proposals. For this purpose, the following tasks were set and solved: to review the methodological approaches to assessing and rationing the quality of natural waters used in some foreign countries and in the Russian Federation, to identify the main causes and shortcomings; to make proposals for improving the current system of water quality rationing. The result of this work is the conclusions about the lack of impact of the strategy operating in Russia in the development of schemes of complex use and protection of water objects, standards of permissible impact on water bodies, the appointment of permissible discharge limits in terms of maintaining and improving the water quality of natural water bodies. The reasons that led to this are indicated. The necessity of taking into account, in addition to the physical and chemical composition, also hydrobiological parameters is shown. It is concluded that instead of fisheries management standards, environmental standards should serve as the basis for target indicators of water quality of natural water bodies, which determine the well-being of humans and the stable functioning of aquatic ecosystems, taking into account regional factors. Proposals were made to adjust the methodological approaches to the implementation of this strategy. According to the authors, these proposals will speed up the solution of the main objectives of the strategy – the ecological improvement of water bodies, the preservation of unique aquatic ecosystems and the environmentally safe development of territories that previously experienced relatively small anthropogenic impacts (Eastern Siberia and the Far East)

Water Quality From Gualaxo Do Norte And Carmo Rivers (Minas Gerais, Brazil) After The Fundão Dam Failure

2021 ◽  
Vol 44 ◽  
Author(s):  
Leonardo Brandão Nogueira ◽  
Sabriny Melo Sousa ◽  
Camila Gonçalves Lobo Santos ◽  
Gustavo Simões Araújo ◽  
Laser Oliveira ◽  
...  
Keyword(s):  
Water Quality ◽  
Trace Elements ◽  
Rainy Season ◽  
Aquatic Ecosystems ◽  
Dam Failure ◽  
Subsistence Farming ◽  
Environmental Disaster ◽  
Uncertain Future ◽  
Toxic Potential

Mining waste is rich in trace elements, which present a high toxic potential and may represent a risk for aquatic ecosystems. The Fundão dam failure, considered the largest environmental disaster in the world, affected 663.2 km of watercourses, including Carmo and Gualaxo do Norte Rivers. The ore tail also affected the riverside communities, destroying villages, killing people and affecting the subsistence farming. To evaluate the influence of the mine tailing wave on the water quality of the Carmo and Gualaxo do Norte Rivers water samples were collected at nine points located in Barra Longa during the rainy season. Physicochemical parameters (conductivity, resistivity, EH, total dissolved solids, pH and temperature) and major, minor and trace elements concentrations (Ba, Co, Cr, Cu, Ni, Sc, Sr, V, Zn, As, Pb, Al, Fe, Mn, Ca, K, Mg and P) were evaluated and compared with previous studies and conformity limits established by a national resolution (CONAMA Resolution N°357/2005). Only conductivity, Fe and Mn presented non-conformity values according to CONAMA Resolution N°357/2005. These results may be related not only to the dam burst but also to the rainy season and non-detectable pollution sources. Furthermore, the decreased levels in the toxic elements in the rivers over time, may be related to its association with sediments in addition to their flux to the Atlantic Ocean. Thus, after nearly six years, the environmental and social impacts are still alive and the minerals dragged to the riverbed could bring cumulative effects for the entire environment what means an uncertain future to the Rio Doce Basin and adjacent coastal zone.

scholarly journals Effects of omnivorous fish on benthic-pelagic habitats coupling in shallow aquatic ecosystems: A minireview

2021 ◽  
Vol 33 (3) ◽  
pp. 667-674
Author(s):  
Mei Xueying ◽  
◽  
Vladimir Razlutskij ◽  
Lars G. Rudstam ◽  
Erik Jeppesen ◽  
...  
Keyword(s):  
Aquatic Ecosystems ◽  
Omnivorous Fish

scholarly journals Feeding Aquatic Ecosystems: Whole-Lake Experimental Addition of Angler’s Ground Bait Strongly Affects Omnivorous Fish Despite Low Contribution to Lake Carbon Budget

Ecosystems ◽  
2018 ◽  
Vol 22 (2) ◽  
pp. 346-362 ◽  
Author(s):  
Thomas Mehner ◽  
Tobias Rapp ◽  
Christopher T. Monk ◽  
Mara E. Beck ◽  
Ashley Trudeau ◽  
...  
Keyword(s):  
Aquatic Ecosystems ◽  
Carbon Budget ◽  
Omnivorous Fish

scholarly journals Frequency of mentum deformity in Chironomus sancticaroli (Diptera: Chironomidae) in a laboratory culture

2019 ◽  
Vol 14 (2) ◽  
pp. 1
Author(s):  
Mariana Silveira Guerra Moura e Silva ◽  
Ana Lúcia Silva Marigo ◽  
William Viveiros ◽  
Mônica Luisa Kuhlmann
Keyword(s):  
Aquatic Ecosystems ◽  
Low Frequency ◽  
Average Frequency ◽  
Laboratory Culture ◽  
Inorganic Pollutants ◽  
Ecotoxicological Tests ◽  
Research And Teaching ◽  
Dilution Water

The midge Chironomus sancticaroli (Diptera: Chironomidae) has been used in ecotoxicological tests because it is sensitive to a variety of inorganic pollutants. Among the parameters used to evaluate the toxicity of a substance is the frequency of mentum deformity, which is part of the oral system of this organism. However, there is still no consensus on the baseline level (percentage) of acceptable deformities in laboratory cultures not exposed to pollutants. The determination of this variable is important to ensure the validity of bioassays and to compare cultures from different research and teaching institutions. Once this value is established, it will also be used to monitor the quality of organisms cultured, since factors such as inbreeding could increase the frequency of mentum deformity. Thus, the objective of this study was to quantify the percentage of mentum deformity in the fourth instar of C. sancticaroli larvae from the culture of the Laboratory of Aquatic Ecosystems, at Embrapa Meio Ambiente. The average frequency of mentum deformity obtained was 6,63%. It is believed that factors such as the renewal of the culture with the inclusion of spawns from the laboratories of other institutions, as well as the control of the quality of the dilution water and the sediment of the breeding may have contributed to a low frequency of mentum deformity of the culture observed in this study.

Submerged macrophytes facilitate dominance of omnivorous fish in a subtropical shallow lake: implications for lake restoration

Hydrobiologia ◽  
2016 ◽  
Vol 775 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Jinlei Yu ◽  
Zhengwen Liu ◽  
Hu He ◽  
Wei Zhen ◽  
Baohua Guan ◽  
...  
Keyword(s):  
Shallow Lake ◽  
Lake Restoration ◽  
Submerged Macrophytes ◽  
Omnivorous Fish

Epiphyton alters the quantity and quality of radiation captured by leaves in submerged macrophytes

2015 ◽  
Vol 120 ◽  
pp. 229-235 ◽  
Author(s):  
Katja Klančnik ◽  
David Gradinjan ◽  
Alenka Gaberščik
Keyword(s):  
Submerged Macrophytes

scholarly journals Pengaruh Organisme Perifiton dalam Memperbaiki Kualitas Air pada Lahan Basah Buatan Sistem Aliran Air Permukaan Bebas

2018 ◽  
Vol 14 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Syamsul Bahri ◽  
Iga Maliga
Keyword(s):  
Water Discharge ◽  
Free Water ◽  
Domestic Wastewater ◽  
Benthic Algae ◽  
Surface Velocity ◽  
Water Contaminants ◽  
Total Phosphate ◽  
Primary Producer ◽  
Percent Removal

The main removal mechanism of water contaminants in wetlands is microorganisms activities. One of them is a periphyton that lives on a submerged substratum. Therefore, a study of the influence of periphyton in construcetd wetlands which is important in improving water quality. The research objectives were to identify of the quality of influent, the composition of algae, the periphytone algae as primary producer, the influence of free water surface velocity factor, the quality of effluent, efectivity and eficiency of constracted wetlands. The study was conducted in Bandung City on January 2017. The results show that influent of sewage is contaminated with domestic wastewater. In constructed wetlands foundthree classes of benthic algae as periphyton, namely Bacillariophyta, Chlorophyta, and Cyanophyta. Periphyton algae play an important role in the transfer of oxygen into water colomn. The free surface velocity factor was strongly correlated to the percent removal of nitrate (r = 0.84) and very strong to the percent removal of total phosphate (r = 0.90) by periphyton. The quality of effluent that qualified grade III were total phosphate and COD parameter only. Effectivity of treatement were 6,6% ? 38,3% BOD, 6,0% ? 38% COD. Efficiency of treatment on the water discharge 0,01 L/s were 4,4% ammonium; 39,2% nitrat; 47,1% organic nitrogen; 53,6% phosphate total; 38,3% BOD; 38% COD; 76,5% detergent.

scholarly journals Water, Sediment and Macrophyte Quality of Some Shrimp Culture Ponds and Freshwater Ecosystems of Koyra

2012 ◽  
Vol 41 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Abdullah Harun Chowdhury ◽  
Roxana Ahmed
Keyword(s):  
Aquatic Ecosystems ◽  
Aquatic Macrophytes ◽  
High Salinity ◽  
Freshwater Ecosystems ◽  
Shrimp Culture ◽  
Physicochemical Conditions

A total of 29 genera belonging to 24 families of aquatic macrophytes were recorded. Among these, 25 species were recorded from the freshwater aquatic ecosystems, 4 species from both the shrimp culture ponds and freshwater aquatic ecosystems and only one from the shrimp culture ponds. The physicochemical conditions of both the habitats indicate that very poor number of macrophytes can grow in the shrimp culture ponds due to high salinity of water and soil. Low population and abundance indicate that the macrophytes are in alarming condition in Koyra due to increasing salinity. DOI: http://dx.doi.org/10.3329/bjb.v41i1.11080 Bangladesh J. Bot. 41(1): 35-41, 2012 (June)

scholarly journals Water Quality of Streams and Springs around a Municipal Landfill Surrounded by Intense Agricultural Activities in a Tropical Environment

2021 ◽  
pp. 166-181
Author(s):  
B. A. Fonge ◽  
E. N. Nkoleka ◽  
F. Z. Asong
Keyword(s):  
Water Quality ◽  
Benthic Algae ◽  
Total Coliform ◽  
Pollution Load Index ◽  
Lead And Cadmium ◽  
After Care ◽  
Soil Ecosystems ◽  
Pollution Indicator ◽  
Open Dumping

In Cameroon waste disposal by open dumping and landfilling are the most practised options. The siting, operation and after-care of landfills remain a challenging task. In this study we assessed water quality of stream, spring and leachate samples around/from the Mussaka landfill through physicochemical, heavy metal, microbial, phytoplankton, and benthic algae analyses. HCO3-, NH4-, NO3- concentrations are all above permissible limits EPA and WHO standards for freshwater systems. Concentrations of Ca2+ and Mg2+ in stream samples were far below standards but far greater (>480 mg/L) in spring and leachate samples. Nickel, lead and cadmium concentrations were above required standards. Contamination factors of all stream samples (CF<3) imply low to moderate contamination but pollution load index for spring sample (PLI>1) imply the spring is polluted. Generally, the obtained concentrations of most of these parameters were far higher for leachate than water samples. Total coliform counts ranged from 3.5 MPN/100mL to 1.1x103 MPN/100 mL. Five E. coli species were detected in all samples in counts ranging from 3.0x102 to 1.0x103CFU/mL. Thirty phytoplankton species belonging to 5 divisions were identified with Bacillariophyta (19 species) having the highest abundance and Euglenophyta (1 species) with least. Ten genera were identified as pollution indicator species. Results of this study justify the assertion that if upgrading options are not sought for the Mussaka landfill, it will become a major source of pollution of aquatic and soil ecosystems within the landfill area and downstream.

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