Seasonal Behavior of Trophic Status Index of a Water Body, Bhalswa Lake, Delhi (India)

2021 ◽  
pp. 165-177
Author(s):  
Sumit Dagar ◽  
S. K. Singh
Keyword(s):  
Water Body ◽  
Trophic Status ◽  
Seasonal Behavior ◽  
Status Index

scholarly journals PENDUGAAN DAYA DUKUNG PERAIRAN UNTUK BUDIDAYA IKAN DALAM KERAMBA JARING APUNG DI WADUK PONDOK, NGAWI JAWA TIMUR

2019 ◽  
Vol 10 (3) ◽  
pp. 197
Author(s):  
Siti Nurul Aida ◽  
Agus Djoko Utomo
Keyword(s):  
Carrying Capacity ◽  
Trophic Status ◽  
Fish Culture ◽  
Balance Model ◽  
Mass Balance Model ◽  
Phosphorus Mass Balance ◽  
Net Cage ◽  
Status Index ◽  
Total P ◽  
Multipurpose Reservoir

Waduk Pondok seluas 407 Ha berada di Ngawi Jawa Timur, beroperasi sejak 1995 dan merupakan waduk serbaguna. Kegiatan budidaya ikan dengan keramba jaring apung (KJA) di Waduk tersebut sudah berkembang, hingga mencapai 126 petak pada tahun 2016. Penelitian ini bertujuan untuk menganalisis tingkat kesuburan perairan, total fosfor yang terlepas dari KJA ke peraian dan mengestimasi daya dukung perairan untuk KJA. Tingkat kesuburan perairan dianalisa dengan nilai index status trofik (TSI). Estimasi daya dukung perairan untuk KJA menggunakan pendekatan model keseimbangan total fosfor (P) yang terlepas ke parairan. Hasil penelitian menunjukkan bahwa perairan waduk Pondok sudah termasuk dalam katagori perairan eutrofik dengan nilai TSI 62,1.Total P yang terlepas ke perairan sebesar 15,04 kg ton ikan. Daya dukung perairan untuk KJA adalah 195,2 ton /tahun (130 petak KJA). Jumlah KJA di Waduk Pondok ada 126 petak (189 ton) atau sudah mendekati daya dukung perairan, sehingga jumlahnya tidak dapat ditambah lagi.Pondok Reservoir as large as 407 hectares is located in Ngawi, East Java. The Reservoir was functionally started in 1995, is a multipurpose reservoir. Fish culture in Pondok Reservoir in 2016 reached 126 cages. The aim of this research is to evaluate the trophic status, the total of phosphorus released into the waters from floating net cage, and carrying capacity of the reservoir for fish culture. Trophic status of reservoir was analyzed trough calculating the TSI (Trophic Status Index). A phosphorus mass balance model was used in assessing the carrying capacity of the reservoir. Research hypotesis in this research is Pondok reservoir has reached eutrophic status, and cages number in Pondok reservoir has alreday exceeds carriying capacity. Pondok reservoir have been categorized as eutrophic status, with the value of TSI 62.1. Total P released to the waters is 15.04 kg P / ton of fish. The carrying capacity of Pondok Reservoir for fish culture is 195,2 ton / year (130 cages). The number fish culture in Pondok Reservoir is 126 cages (189 ton), has already approaching maximum number can not be added anymore.

scholarly journals Trophic status index of lentic systems from the diversity of aquatic plants from continental Ecuador (IMAE)

Caldasia ◽  
2020 ◽  
Vol 42 (1) ◽  
pp. 115-128
Author(s):  
Esteban Terneus-Jácome ◽  
Berenice Vallejo-Solano ◽  
Mateo Gómez de la Torre ◽  
Christian Larenas-Uría
Keyword(s):  
Aquatic Plants ◽  
Trophic Status ◽  
Environmental Control ◽  
Habitat Preferences ◽  
Floristic Composition ◽  
Indicator Values ◽  
Lake Systems ◽  
Biological Group ◽  
Status Index ◽  
Lentic Systems

Aquatic plants are a priority biological group to study due to their high representativeness in ecosystem services and because they also indicate the state of conservation of lake systems. The goal of the study is to develop an Index of Macrophytes from continental Ecuador (IMAE), which can also be applied in the Andean region as a bioindicator, thus assessing the ecological health of the continental lakes and lagoons from 12 to 4000 m, evaluating the structure and floristic composition of aquatic plants and identifying the habitat preferences of the species according to the concentration of nutrients (nitrites, phosphates and ammonium), as determining elements of their presence. 104 species of aquatic plants were found. The tolerance and indicator values have been calculated for each species meanwhile seven levels of coverage were established. Last, four classes of trophic status or water quality were defined to asses lentic systems. The present study will significantly strengthen the environmental control tools for Ecuador.

Phytoplankton of the Irkutsk Reservoir as an indicator of water quality

2012 ◽  
Vol 41 (2) ◽  
Author(s):  
Galina Popovskaya ◽  
Alena Firsova ◽  
Anna Bessudova ◽  
Maria Sakirko ◽  
Alexander Suturin ◽  
...  
Keyword(s):  
Water Quality ◽  
Species Composition ◽  
Lake Baikal ◽  
Water Body ◽  
Phytoplankton Biomass ◽  
Trophic Status ◽  
Algal Species ◽  
Open Water ◽  
Chemical Parameters ◽  
Oligotrophic Water

AbstractThe species composition of phytoplankton and quantitative parameters of its abundance are indicators of ecological conditions in a water body. This paper deals with the analysis of phytoplankton in the Irkutsk Reservoir, which was formed more than 50 years ago on the Angara River flowing out of Lake Baikal. The level of phytoplankton development in the reservoir is directly dependent on the abundance of diatoms in Lake Baikal. The dominant assemblage of algal species is stable and consists mainly of diatoms, chlorophytes, and chrysophytes. Cyanobacteria are represented by a small number of species with low abundance. According to the composition of indicator species, the water in the lower reaches of the Irkutsk Reservoir can be classified as clean. The saprobity index in the open-water period is 1.2, increasing to between 1.3 and 1.5 in small bays. The values of phytoplankton biomass and chemical parameters of water recorded in 2008 indicate that the Irkutsk Reservoir is an oligotrophic water body. Its trophic status has not changed significantly since the time of impoundment (1956–1958).

scholarly journals TROPHIC STATUS OF A TROPICAL COASTAL LAGOON IN MARGARITA ISLAND, VENEZUELA

2021 ◽  
Author(s):  
Carlos Julio Pereira-Ibarra ◽  
Fabiola López-Monroy
Keyword(s):  
Chlorophyll A ◽  
Residence Time ◽  
Coastal Lagoon ◽  
Water Body ◽  
Industrial Development ◽  
Trophic Status ◽  
Caribbean Sea ◽  
Economic Importance ◽  
Trophic Condition ◽  
Potential Source

Punta de Piedras Lagoon is a coastal lagoon located south of Margarita Island, in the Venezuelan Caribbean Sea. This lagoon has ecological and economic importance for the inhabitants of nearby communities. Currently, the urban and industrial development in its surroundings represents a potential source of pollutants, providing concentrations of nutrients that could affect the ecological balance of the area. The trophic status of Punta de Piedras Lagoon was evaluated using various trophic indices. The concentrations of chlorophyll-a and nutrients (ammonium, nitrites, nitrates, and orthophosphates) were estimated in 10 stations with a monthly frequency from February 2005 to January 2006. These data were used to estimate the trophic condition based on the Karydis and TRIX trophic indices, and by comparison with Organization for Economic Co-operation and Development reference values. It was found that Punta de Piedras lagoon presented mesotrophic conditions in most of the water body having considerable differences between indices. The values of the closest station to Paseo Esther Gil corresponded to eutrophic waters. However, the circulation and residence time of water allow an exchange with the adjacent sea, which prevents the eutrophication process in the lagoon.

scholarly journals External water exchange of lakes as the integral indicator of water body types

2012 ◽  
Vol 12 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Arkady M. Doganovsky
Keyword(s):  
Water Body ◽  
Lake Level ◽  
Water Exchange ◽  
Trophic Status ◽  
Drainage Area ◽  
Lake Basin ◽  
Water Replacement ◽  
External Water ◽  
Integral Indicator

Abstract External water exchange of overflow lakes is presented as the integral indicator, defining the type of lake basin. Intensity of water replacement in the lake (Kw) determines many processes taking place in the lake and its drainage area. Simultaneously this process influences the runoff of the outflowing river. Among the processes in the lake, depending on Kw, transitory-accumulative possibilities, predominance of allochton and limnic processes, and the participation of Kw in forming trophic status are considered. Some examples of the dependence of the parameters of lake level distribution curves upon the Kw values are given. The problem of calculation of Kw for unexplored objects is also regarded. The text contains specific examples of the results of calculations and analysis.

scholarly journals Performance Analysis of ANN Model for Estimation of Trophic Status Index of Lakes

2018 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Tushar Anthwal ◽  
Akanksha Chandola ◽  
M P Thapliyal
Keyword(s):  
Mean Square Error ◽  
Trophic Status ◽  
Error Function ◽  
Water Bodies ◽  
Mean Square ◽  
Ann Model ◽  
Feed Forward Back Propagation ◽  
Average Mean Square Error ◽  
Quasi Newton ◽  
Status Index

The health of water bodies across the globe is of high concern as the pollution is accelerating rigorously. With the interventions of simple technology, some significant changes could be bought up. Lakes are dying because of high Trophic Index Status which shows the eutrophication level of water bodies. Taking this into account, feed forward back propagation neural network model is used to estimate the Trophic Status Index (TSI) of lakes which could compute the value of TSI with the given parameters; pH, temperature, dissolved oxygen, Secchi disk transparency, chlorophyll and total phosphate. Two learning algorithms; Levenberg Marquardt (LM) and Broyden–Fletcher–Goldfarb–Shanno (BFGS) Quasi Newton were used to train the network, which belongs to different classes. The results were analyzed using mean square error function and further checked for the deviation from actual data. Among both the training algorithm; LM demonstrated better performance with 0.0007 average mean square error for best validation performance and BFGS Quasi Newton shows the average mean square error of 1.07.

scholarly journals Trophic Relationships and Status of Reservoirs with and without Occurrence of Dreissena ssp. (Mollusca, Bivalvia) Built on Bulgarian Danube River Tributaries

2016 ◽  
Vol 18 (1) ◽  
pp. 13-22
Author(s):  
Roumen Kalchev ◽  
Mihaela Beshkova ◽  
Hristina Kalcheva
Keyword(s):  
Linear Regression ◽  
Alien Species ◽  
Linear Relationship ◽  
Trophic Status ◽  
Invasive Alien Species ◽  
Secchi Depth ◽  
Danube River ◽  
Trophic Relationships ◽  
Regression Equations ◽  
Status Index

Abstract The trophic status and relationships between Secchi depth transparency (SD) chlorophyll-a (CHL) and total phosphorus (TP) concentrations from nine non-infested and five infested areas with invasive alien species, Dreissena ssp. reservoirs, situated on the Bulgarian Danube River tributaries were studied. The trophic status index (TSI) values after Carlson (1977), and showed statistically significant differences for all three variables between infested and non-infested reservoirs. The three linear regression equations between SD × CHL, CHL × TP and SD × TP were statistically significant for the group of non-infested reservoirs, while in the infested reservoirs only the SDxCHL regression was statistically significant for P < 0.05. Our results showed that the Dreissena invasion destroyed the linear relationship between CHL × TP and SD × TP and seems to affects the accurate application of Carlson TSI.

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