Correlation of dissolved oxygen levels, fresh-water flows and temperatures in a polluted estuary

Mackay, David W.; Fleming, George

doi:10.1016/0043-1354(69)90030-x

Cited by 15 publications

(8 citation statements)

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“…Several authors showed that no relationship exists between dissolved oxygen concentrations and salinity (POMFRET et aL, 1991) and that the oxygen depletion is all the more catastrophic when high temperature conditions occur in the entrapment zone (MACKAY and FLEMING, 1969). So hypoxia (indeed even anoxia) may become a recurrent event as soon as the unfavourable conditions of river flow, tide, turbidity and temperature occur concommitantly in the upper and the middle parts of an estuary.…”

Section: Discussionmentioning

confidence: 99%

“…Variations of these features are often cyclic and their magnitude depends on climatic conditions (rainfall, wind). When harsh conditions prevail (pollution, dryness), catastrophic events as hypoxia may be observed (MACKAY and FLEMING, 1969). Such a phenomenon may be linked either to eutrophication which corresponds to an enrichment in nutrients (HANSSON and RUDSTAM, 1990;DAY et aL, 1989) or to occurrence of an entrapment zone where accumulation of suspended mineral and organic material enhances bacterial activity (BOUCHET et aL, 1976;BROSSARD and GALLENNE, 1982;ROMANA et aL, 1990;DAY et aL, 1989).…”

Section: Introouctionmentioning

confidence: 99%

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The influence of seasonal salinity and turbidity maximum variations on the nursery function of the Loire estuary (France)

Marchand

1993

Netherlands Journal of Aquatic Ecology

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Section: Discussionmentioning

confidence: 99%

Section: Introouctionmentioning

confidence: 99%

The influence of seasonal salinity and turbidity maximum variations on the nursery function of the Loire estuary (France)

Marchand

1993

Netherlands Journal of Aquatic Ecology

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“…8 ). Dissolved oxygen levels increase with freshwater runoff and decrease with rise in temperature 62 . DIM2 can be represented as a physicochemical source due to the natural changes in the aquatic environment and the ionic properties of the water body.…”

Section: Discussionmentioning

confidence: 99%

Dominant phytoplankton groups as the major source of polyunsaturated fatty acids for hilsa (Tenualosa ilisha) in the Meghna estuary Bangladesh

Shaha

Hasan

Kundu³

et al. 2022

Sci Rep

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The tropical estuarine ecosystem is fascinating for studying the dynamics of water quality and phytoplankton diversity due to its frequently changing hydrological conditions. Most importantly, phytoplankton is the main supplier of ω3 polyunsaturated fatty acids (PUFA) in the coastal food web for fish as they could not synthesize PUFA. This study evaluated seasonal variations of water quality parameters in the Meghna River estuary (MRE), explored how phytoplankton diversity changes according to hydro-chemical parameters, and identified the major phytoplankton groups as the main source of PUFA for hilsa fish. Ten water quality indicators including temperature, dissolved oxygen, pH, salinity, dissolved inorganic nitrogen (DIN = nitrate, nitrite, ammonia) and phosphorus, dissolved silica and chlorophyll-a were evaluated. In addition, phytoplankton diversity was assessed in the water and hilsa fish gut. Principal component analysis (PCA) was used to analyze the spatio-temporal changes in the water quality conditions, and the driving factors in the MRE. Four main components were extracted and explained 75.4% variability of water quality parameters. The most relevant driving factors were dissolved oxygen, salinity, temperature, and DIN (nitrate, nitrite and ammonia). These variabilities in physicochemical parameters and dissolved inorganic nutrients caused seasonal variations in two major groups of phytoplankton. Peak abundance of Chlorophyta (green algae) occurred in water in nutrient-rich environments (nitrogen and phosphorus) during the wet (36%) season, while Bacillariophyta (diatoms) were dominant during the dry (32%) season that depleted dissolved silica. Thus, the decrease of green algae and the increase of diatoms in the dry season indicated the potential link to seasonal changes of hydro-chemical parameters. The green algae (53.7%) were the dominant phytoplankton group in the hilsa gut content followed by diatoms (22.6%) and both are contributing as the major source of PUFAs for hilsa fish according to the electivity index as they contain the highest amounts of PUFAs (60 and 28% respectively).

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“…Quantifying nutrient content in water is complex because it involves considering multiple factors, from air quality to land use in the catchment area (Jeppesen et al 2009). The DO concentration was selected as a proxy for water quality because this parameter is largely directly affected by temperature (Mackay and Fleming 1969).…”

Section: Climate Change Analysismentioning

confidence: 99%

Ecohydrology and flood risk management under climate vulnerability in relation to the sustainable development goals (SDGs): a case study in Nagaa Mobarak Village, Egypt

et al. 2022

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This article aims to provide a thorough assessment of water quality and quantity incorporating the estimation of future patterns as a result of climate change from economic, environmental and social perspectives. Its scope extends from studying the physical parameters and rainfall patterns to maintaining an environmental flow with a better water quality using ecohydrological techniques. The village of Nagaa Mobarak in Souhag, Egypt, is taken as a case study being in a critical location that is vulnerable to flash floods. This paper managed to quantify change in water quantity and quality due to the impacts of flash floods and climate change. Several traditional engineering alternatives are proposed for flood management such as constructing a dam, a storage pond and a routing channel to the nearest water body; as well as non-traditional ecohydrological alternatives such as constructing a dam with vegetated foreshore, natural levees and constructed wetlands. The results of applying these methods for our case study showed that a hybrid solution that employs both traditional and non-traditional solutions for flood management is optimal. A constructed wetland along a section of the constructed channel for diverting flow into the Nagaa Hammade Canal would decrease the runoff volume and peak time so that the capacity of the Canal is not exceeded in a flood event and purifies the incoming stormwater improving its quality and the health of the ecosystem within the canal. Moreover, our proposed approach was investigated and found to target 10 out of the 17 UN SDGs.

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Correlation of dissolved oxygen levels, fresh-water flows and temperatures in a polluted estuary

Cited by 15 publications

References 0 publications

The influence of seasonal salinity and turbidity maximum variations on the nursery function of the Loire estuary (France)

The influence of seasonal salinity and turbidity maximum variations on the nursery function of the Loire estuary (France)

Dominant phytoplankton groups as the major source of polyunsaturated fatty acids for hilsa (Tenualosa ilisha) in the Meghna estuary Bangladesh

Ecohydrology and flood risk management under climate vulnerability in relation to the sustainable development goals (SDGs): a case study in Nagaa Mobarak Village, Egypt

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