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 Diverse role of Macrophytes in aquatic ecosystems: A brief review

2019 ◽  
Vol 19 ◽  
pp. 40-48
Author(s):  
Mitu De ◽  
◽  
Chayanika Roy ◽  
Suchismita Medda ◽  
Sulagna Roy ◽  
...  
Keyword(s):  
Aquatic Ecosystem ◽  
Aquatic Ecosystems ◽  
Aquatic Macrophytes ◽  
Food Source ◽  
Aquatic Vegetation ◽  
Submerged Macrophytes ◽  
Freshwater Ecosystems ◽  
Aquatic Life ◽  
Aquatic Flora

The aquatic ecosystem is composed of aquatic flora and fauna which interact together in maintaining the aquatic ecosystem. Aquatic macrophytes are macroscopic forms of aquatic vegetation, including macro algae, mosses, ferns and angiosperms found in aquatic habitat. Macrophytes of freshwater ecosystems have diverse roles to play in the structure and functioning of these aquatic ecosystems. The depth, density, diversity and types of macrophytes present in a system are indicators of water body health. Aquatic vegetation can influence the water quality too. Macrophytes are considered as an important component of the aquatic ecosystem as the habitat and food source for aquatic life. Of all the biological treatments for controlling eutrophication, submerged macrophytes, has been recognized as being the most effective. This paper is a brief review of the diverse role of macrophytes in an aquatic ecosystem.

Low-Energy Desalination Technologies for Treating Mining Effluents 

2021 ◽  
Author(s):  
Georgios Kolliopoulos
Keyword(s):  
Aquatic Ecosystems ◽  
Mine Drainage ◽  
High Salinity ◽  
Industrial Effluents ◽  
Clean Water ◽  
Environmental Footprint ◽  
Sequence Of Events ◽  
The People ◽  
Tailings Ponds

<p>As our societies evolved and the quality of primary resources deteriorated, water use in process circuits has led to the generation of ever-increasing volumes of contaminated effluents. Despite the efforts for water recycling in process circuits, desalination technologies fail to treat solutions of high salinity, due to their focus on dilute solutions, such as seawater. The lack of energy efficient effluent desalination technologies leaves vast volumes of aqueous residues sitting in tailings ponds. This practice often allows oxygen to dissolve in water and oxidize certain elements, which leads to the generation of acid in a sequence of events known as acid mine drainage. Uncontrolled discharges resulting from such mining wastes have detrimental effects on the nearby water quality and aquatic ecosystems as well as on the health of the people of the local communities. In this work, we report on novel freeze desalination processes that can recover clean water from such industrial effluents in the form of ice at significantly lower energy compared to state-of-the-art desalination processes. Therefore, the developed technologies promise to economically and efficiently reduce the water-consumption related environmental footprint of the processing industry, the risks and liabilities associated with tailings ponds, as well as to secure access to safe clean water for nearby communities.</p>

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.

Spatial and seasonal variability of emergent aquatic insects and nearshore spiders in a subtropical estuary

2019 ◽  
Vol 70 (4) ◽  
pp. 541 ◽  
Author(s):  
Martha J. Zapata ◽  
S. Mažeika P. Sullivan
Keyword(s):  
Aquatic Insects ◽  
High Salinity ◽  
Aquatic Insect ◽  
Freshwater Ecosystems ◽  
Dispersal Ability ◽  
Insect Community ◽  
Insect Communities ◽  
Low Salinity ◽  
Subtropical Estuary ◽  
Adult Aquatic Insects

Variability in the density and distribution of adult aquatic insects is an important factor mediating aquatic-to-terrestrial nutritional subsidies in freshwater ecosystems, yet less is understood about insect-facilitated subsidy dynamics in estuaries. We surveyed emergent (i.e. adult) aquatic insects and nearshore orb-weaving spiders of the families Tetragnathidae and Araneidae in a subtropical estuary of Florida (USA). Emergent insect community composition varied seasonally and spatially; densities were lower at high- than low-salinity sites. At high-salinity sites, emergent insects exhibited lower dispersal ability and a higher prevalence of univoltinism than low- and mid-salinity assemblages. Orb-weaving spider density most strongly tracked emergent insect density rates at low- and mid-salinity sites. Tetragnatha body condition was 96% higher at high-salinity sites than at low-salinity sites. Our findings contribute to our understanding of aquatic insect communities in estuarine ecosystems and indicate that aquatic insects may provide important nutritional subsidies to riparian consumers despite their depressed abundance and diversity compared with freshwater ecosystems.

Effects of algae, yeast and photosynthetic bacteria diets on survival and growth performance in the fairy shrimp, Streptocephalus sirindhornae (Branchiopoda, Anostraca)

Crustaceana ◽  
2018 ◽  
Vol 91 (12) ◽  
pp. 1505-1522 ◽  
Author(s):  
Chewapat Saejung ◽  
Anuwat Chaiyarat ◽  
La-Orsri Sanoamuang
Keyword(s):  
Growth Performance ◽  
Photosynthetic Bacteria ◽  
Photosynthetic Bacterium ◽  
Ammonia Concentration ◽  
Fairy Shrimp ◽  
Shrimp Culture ◽  
Survival And Growth ◽  
Nitrate And Nitrite ◽  
First Time

Abstract This study investigated the effects on survival, growth performance and water quality of algae, yeast and photosynthetic bacteria as diets for larval and immature/mature Streptocephalus sirindhornae. Survival of the larvae fed with the alga Chlorella vulgaris and the photosynthetic bacterium Rhodopseudomonas faecalis for 5 days was higher than 80%, while those fed with the yeast Saccharomyces cerevisiae was 4.4%. After feeding the 6-day-old fairy shrimp until they reached 30 days of age, those fed with bacteria showed the highest survival and growth rate. Ammonia, nitrate and nitrite concentrations in the water treated with R. faecalis were the lowest. The highest ammonia concentration, the lowest dissolved oxygen, and excessive turbidity were found in the yeast treatment. Frequent water replacement could not overcome this, which resulted in the low survival rate. Utilization of photosynthetic bacteria in fairy shrimp culture is for the first time reported herein, and the disadvantages of using yeast in S. sirindhornae cultivation are discussed.

scholarly journals Assessment of the quality of freshwater ecosystems based on the functional condition of bivalved mollusks

2019 ◽  
Vol 46 (2) ◽  
pp. 214-224
Author(s):  
S. V. Kholodkevich ◽  
A. N. Sharov ◽  
G. M. Chuiko ◽  
T. V. Kuznetsova ◽  
M. V. Gapeeva ◽  
...  
Keyword(s):  
Functional State ◽  
Rybinsk Reservoir ◽  
Functional Condition ◽  
Freshwater Ecosystems ◽  
Gulf Of Finland ◽  
Bivalve Mollusks ◽  
Accumulation Of Metals ◽  
The Rybinsk Reservoir ◽  
The Gulf Of Finland

An approach is proposed for ranking the quality of freshwater ecosystems by the state of bivalve mollusks living in them. Cardioactivity indicators and accumulation of metals in the tissues of the mollusks from various waters of the eastern part of the Gulf of Finland and the Rybinsk Reservoir were used to characterize the ecosystems, and an original hyperosmotic test was used to analyze the functional state of the mollusks.

New evidences of Roundup® (glyphosate formulation) impact on the periphyton community and the water quality of freshwater ecosystems

Ecotoxicology ◽  
2009 ◽  
Vol 19 (4) ◽  
pp. 710-721 ◽  
Author(s):  
María S. Vera ◽  
Leonardo Lagomarsino ◽  
Matías Sylvester ◽  
Gonzalo L. Pérez ◽  
Patricia Rodríguez ◽  
...  
Keyword(s):  
Water Quality ◽  
Freshwater Ecosystems ◽  
Periphyton Community ◽  
Glyphosate Formulation

Diversity of macrophytes in the Amazon deforestation arc: information on their distribution, life-forms and habits

Rodriguésia ◽  
2021 ◽  
Vol 72 ◽  
Author(s):  
Ana Luísa Biondi Fares ◽  
Raimundo Luiz Morais de Sousa ◽  
Ely Simone Cajueiro Gurgel ◽  
André dos Santos Bragança Gil ◽  
Carlos Alberto Santos da Silva ◽  
...  
Keyword(s):  
Aquatic Ecosystems ◽  
Aquatic Macrophytes ◽  
Anthropogenic Activities ◽  
Life Forms ◽  
Biological Processes ◽  
Macrophyte Species ◽  
Form Part ◽  
Arc Of Deforestation ◽  
Northern Brazil ◽  
Suitable Habitats

Abstract The Amazon possesses the largest fluvial system on the planet, harboring a diverse biota. Still, many species remain undescribed, because of the Amazon’s immense scale and complexity, and because many habitats are now increasingly under pressure from anthropogenic activities. Macrophytes are important to physical and biological processes in aquatic ecosystems but remain poorly studied in Northern Brazil. The objective of this study was to provide a checklist of macrophyte species that occur in municipalities that form part of the Arc of Deforestation, Pará state, Brazil, bringing information on their habits and life-forms. We sampled 36 sites at three types of aquatic ecosystems (streams, ponds and lakes). In total, we recorded 50 species, 38 genera and 24 families. Most species were amphibious or emergent. Degraded streams have environmental characteristics similar to lentic habitats, which could provide more suitable habitats for macrophytes that otherwise would not occur in lotic habitats, thus explaining the higher diversity in these ecosystems. Macrophyte diversity in this region follows similar patterns to other Brazilian regions. This study contributes to the assessment of aquatic macrophytes in the Amazon, especially in more degraded regions, such as the Amazon deforestation arc.

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