WATER QUALITY RESTORATION: THE EFFECT OF ZOOPLANKTON ON CYANOBACTERIA DEVELOPMENT IN TWO EUTROPHIC PONDS

2021 ◽  
Vol 43 (3) ◽  
pp. 336-346
Author(s):  
Tatyana GERASIMOVA ◽  
◽  
Anatoly SADCHIKOV ◽  
Keyword(s):  
Water Quality ◽  
Daphnia Magna ◽  
Water Transparency ◽  
High Abundance ◽  
Dimensional Structure ◽  
Nutrient Input ◽  
Daphnia Longispina ◽  
Eutrophic Ponds

Based on a study of the dimensional structure of phytoand zooplankton, it is demonstrated that fi trophic press leads to a decrease in the population and size of zooplankton. Th isolation of fi zooplankton from planktoneating fi favors the development of largesize fi in particular, Daphnia magna and Daphnia longispina, which can consume cyanobacteria. In cases of high abundance, zooplankton breaks up large colonies and improves its food base. Planktoneating fi and hatchlings eat fi zooplankton, thereby indirectly contributing to the development of cyanobacteria. In cases of higher nutrient input in the absence of planktoneating fi fi zooplankton can regulate the development of phytoplankton, contributing to higher water transparency. Th main consumers of colonial cyanobacteria are largesize fi D. magna, D. longispina, etc.

Nutrient Input and Trophic Status of the “Neue Donau”, a High-Water Control System along the River Danube in Vienna, Austria

1990 ◽  
Vol 22 (5) ◽  
pp. 137-144 ◽  
Author(s):  
M. T. Dokulil ◽  
G. A. Janauer
Keyword(s):  
Water Quality ◽  
Control System ◽  
Trophic Status ◽  
High Water ◽  
Nutrient Concentrations ◽  
Nutrient Input ◽  
Water Control ◽  
Trophic Conditions ◽  
River Danube ◽  
High Nutrient

The system “Neue Donau” functions as a control system for high waters of the river Danube and is an important recreational area for many people. Water quality and trophic status of the water body is thereforeof prime importance. The high nutrient concentrations of the river Danube (P-tot 238±41µg/l, N-tot 2.53±0.78 mg/l) reach the system via groundwater seepage. Present conditions in the basin of Neue Donau are,as a result of this nutrient in-flux,eutrophic to hypertrophic. Average values during the summer period have declined from 366 µg/l total phosphorus to 78 µg/l, and from 86 µg/l chlorophyll-a tol7µg/l between the years 1985 and 1988. However, a dam which is planned in the river at Vienna will permanently raise the water level of the river thus increasing the the groundwater flow in the direction to the Neue Donau and therefore the nutrient input which will enhance trophic conditions in the impoundment. Since macrophytes play an important role in one part of the system macrophyte management together with measures along the river are some of the suggested strategies to keep the system Neue Donau at acceptable trophic conditions and good water quality.

scholarly journals The density and distribution of Pacific Oyster (Crassostrea gigas) in Krueng Cut, Aceh Besar

2021 ◽  
Vol 869 (1) ◽  
pp. 012056
Author(s):  
M Ramadhaniaty ◽  
C Octavina ◽  
FA Putri ◽  
S Karina ◽  
Ichsan
Keyword(s):  
Crassostrea Gigas ◽  
Aquatic Environment ◽  
Random Sampling ◽  
Pacific Oyster ◽  
Sea Water ◽  
The Other ◽  
High Abundance ◽  
Nutrient Input ◽  
Oyster Population

Abstract Crassostrea gigas is a Pacific oyster that has the largest size among the other oysters. This oyster is most often found because of its ability to adapt to a variety of environments. Krueng Cut is an estuary area that gets a lot of nutrient input from sea water because it is directly adjacent to the ocean. This condition makes this area has a high abundance of oysters with high fishing and antropogenic activities as well. The purpose of this study was to determine the density and distribution of the oyster population from 3 representative stations along the estuary area of Krueng Cut. The method used in this study is random sampling using a quadratic transect. The results show that the highest density is indicated by station 3 with 55.67 ind/m2 and the lowest density is indicated by station 1 is 40.33 ind/m2. These results indicate that the activities of residents, the entry of contaminants from antropogenic affect the density of oysters. The distribution of oysters from the three stations showed similarities, namely they tended to grouping. The aquatic environment at the three research stations still supports the growth of oysters. This study confirms that there has been a decline in the population, which is characterized by a decrease in the number of catches and a smaller size of oysters.

scholarly journals An Overall Evaluation of Water Transparency in Lake Malawi from MERIS Data

2019 ◽  
Vol 11 (3) ◽  
pp. 279 ◽  
Author(s):  
Augusto Vundo ◽  
Bunkei Matsushita ◽  
Dalin Jiang ◽  
Mangaliso Gondwe ◽  
Rossi Hamzah ◽  
...  
Keyword(s):  
Water Quality ◽  
Satellite Data ◽  
Lake Malawi ◽  
Water Transparency ◽  
Estimation Accuracy ◽  
Imaging Spectrometer ◽  
Routine Monitoring ◽  
Level 3 ◽  
Level 1 ◽  
Highly Correlated

Lake Malawi is an important water resource in Africa. However, there is no routine monitoring of water quality in the lake due to financial and institutional constraints in the surrounding countries. A combination of satellite data and a semi-analytical algorithm can provide an alternative for routine monitoring of water quality, especially in developing countries. In this study, we first compared the performance of two semi-analytical algorithms, Doron11 and Lee15, which can estimate Secchi disk depth (SD) from satellite data in Lake Malawi. Our results showed that even though the SD estimations from the two algorithms were very highly correlated, the Lee15 outperformed the Doron11 in Lake Malawi with high estimation accuracy (RMSE = 1.17 m, MAPE = 18.7%, R = 0.66, p < 0.05). We then evaluated water transparency in Lake Malawi using the SD values estimated from nine years of Medium Resolution Imaging Spectrometer (MERIS) data (2003–2011) with the Lee15 algorithm. Results showed that Lake Malawi maintained four water transparency levels throughout the study period (i.e., level 1: SD > 12 m; level 2: SD between 6–12 m; level 3: SD between 3–6 m; level 4: SD between 1.5–3 m). The level 1 and 2 water areas tended to shift or trade places depending on year or season. In contrast, level 3 and 4 water areas were relatively stable and constantly distributed along the southwestern and southern lakeshores. In general, Lake Malawi is dominated by waters with SD values larger than 6 m (>95%). This study represents the first overall and comprehensive analysis of water transparency status and spatiotemporal variation in Lake Malawi.

A novel index for assessing the water quality of urban landscape lakes based on water transparency

2020 ◽  
Vol 735 ◽  
pp. 139351
Author(s):  
Nini Chang ◽  
Li Luo ◽  
Xiaochang C. Wang ◽  
Jia Song ◽  
Jiaxing Han ◽  
...  
Keyword(s):  
Water Quality ◽  
Urban Landscape ◽  
Water Transparency

Are Preferences for Water Quality Different for Second-Home Residents?

2009 ◽  
Vol 15 (3) ◽  
pp. 629-651 ◽  
Author(s):  
Catalina M. Torres ◽  
Antoni Riera ◽  
Dolores García
Keyword(s):  
Water Quality ◽  
Environmental Quality ◽  
Coastal Area ◽  
Inverse Correlation ◽  
Water Transparency ◽  
Second Home ◽  
New Type ◽  
Key Variables ◽  
Recreational Use

The latest trends in tourism indicate the emergence of a new segment of visitors looking for accommodation in private residences. The increase in second-home residents has led to efforts to improve knowledge of the preferences of this new type of tourist in those destinations where their presence is considerable. As one of the key variables affecting the choice of residential tourists is the environmental quality of the area, this paper focuses on testing for the existence of an inverse correlation between the loss of coastal water transparency, viewed as a measure of environmental quality, and beach aesthetics in Santa Ponça Bay, a Mallorcan coastal area containing two urban beach zones of intensive recreational use, where the proportion of second-home residents is high. The results show that the willingness to pay for improvements in water transparency diminishes in a non-linear way when transparency deteriorates, resulting in no statistically significant differences between first- and second-home residents.

scholarly journals Illustrated checklist of pea clams (Mollusca: Bivalvia: Sphaeriidae) from Nepal

1970 ◽  
Vol 3 (5) ◽  
pp. 57-65 ◽  
Author(s):  
Hasko Nesemann ◽  
Subodh Sharmap
Keyword(s):  
Water Quality ◽  
Life Span ◽  
Central Asia ◽  
Key Words ◽  
Indicator Species ◽  
High Abundance ◽  
Altitudinal Range ◽  
Long Life

The pea clams (Sphaeriidae) of Nepal are represented by 11 taxa. The highest diversity is found in the mid-altitudinal range between 795 and 1570 masl. Pea clams are poorly represented in the high Himalaya and the Terai. Faunal associations are with the Palaearctic and Oriental regions and with Central Asia. Most pea clams are useful indicator species and, owing to their high abundance and long life span, they are useful in monitoring the water quality of streams. Key words: Pisidium, Musculium, pea clam, indicator species, Sphaeriidae, Nepal Himalayan Journal of Sciences 3(5) 2005 p. 57-65

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