Dissolved oxygen deficits in a shallow eutrophic aquatic ecosystem (fishpond) – Sediment oxygen demand and water column respiration alternately drive the oxygen regime

Baxa, Marek; Musil, Martin; Kümmel, Miroslav; Hanzlík, Petr; Tesařová, Blanka; Pechar, Libor

doi:10.1016/j.scitotenv.2020.142647

Cited by 57 publications

(35 citation statements)

References 36 publications

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“…urbanization, wastewater disposal, agricultural land-uses, combustion of fossil fuels, and habitat destruction) strongly impacts all freshwaters ecosystems (Bhagowati and Ahamad, 2019). This phenomenon not only affects the physical and chemical characters of ecosystems but also affects the biodiversity and functions of lentic ecosystems with excessive growth of nuisance macrophytes (Bhagowati and Ahamad, 2019), cyanobacterial blooms (Lürling and Mucci, 2020), severe oxygen deficiency (Baxa et al, 2020), excessive animal especially sensitive fish species death (Nobre et al, 2019), loss of submerged macrophytes (Liu et al, 2020), taste and bad odor problems.…”

Section: Introductionmentioning

confidence: 99%

Ecological assessment of Burç Reservoir’s surface water (Turkey) using phytoplankton metrics and multivariate approach

ÇELEKLİ,

ÖZPINAR

2021

Turk J Bot

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The present study was aimed to elucidate relationships between phytoplankton species and stressors using multivariate approaches and assess the environmental condition of Burç Reservoir's surface water using phytoplankton metrics from September 2018 to August 2019 according to implementations of the Water Framework Directive. Burç Reservoir had a characteristic of a warm monomictic pattern. Phytoplankton functional groups (E, F, J, L O , L M , MP, P, S1, T, and W1) were found in the reservoir. A significant difference was found in total biovolume values changed from 2.28 mm 3 /L in November 2018 to 0.51 mm 3 /L in February 2019. The first two axes of canonical correspondence analysis explained 99.2 % of relationships between stressors and phytoplankton assemblages. Explanatory factors such as electrical conductivity (EC), nitrate (NO3-N), total nitrogen (TN), water temperature, calcium (Ca +2 ), precipitation, total organic carbon (TOC), ortho-phosphate (o-PO4), and total phosphorus (TP) significantly drove the spatiotemporal distribution of phytoplankton. Weighted average regression resulted that phytoplankton species such as Gymnodinium saginatum, Snowella lacustris, Ceratium hirundinella, and Pseudanabaena limnetica were closely associated with high TP, while Fragilaria capucina, Navicula trivialis, Cymbella aspera, Ulnaria biceps, Nitzschia palea, and Pseudopediastrum boryanum closely related to the EC. Carlson's trophic state index indicated that Burç Reservoir mainly has a eutrophic characteristic with the assessment of chlorophyll a, total phosphorus, and Secchi disk depth, while it had a euhypertrophic according to the OECD classification. Results of the modified PTI-phytoplankton trophic index (mean = 2.37), the Med-PTI Mediterranean phytoplankton trophic index (mean = 1.96), and the Q assemblage index (mean = 2.58) indicated a moderate ecological status of BurçReservoir. The present study confirmed that phytoplankton assemblages are closely integrated with the environmental condition of Burç Reservoir, which could be assessed by using the PTI and Med-PTI.

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Section: Introductionmentioning

confidence: 99%

Ecological assessment of Burç Reservoir’s surface water (Turkey) using phytoplankton metrics and multivariate approach

ÇELEKLİ,

ÖZPINAR

2021

Turk J Bot

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“…The oxygen-consuming substances mentioned above are naturally present in water but at low concentrations that do not cause deoxygenation of the water. Social and economic development leads to large amounts of untreated OCPs to be discharged into RBs, causing pollution in rivers and lakes and leading to deoxygenation. ,, Gradual improvements in municipal infrastructure have decreased OCP inputs to RBs in China …”

Section: Discussionmentioning

confidence: 99%

“…Social and economic development leads to large amounts of untreated OCPs to be discharged into RBs, causing pollution in rivers and lakes and leading to deoxygenation. 5,14,33 Gradual improvements in municipal infrastructure have decreased OCP inputs to RBs in China. 34 Simulations of the OCPs and DO concentrations supported our hypothesis that controlling OCP emissions had allowed DO concentrations in the aquatic environment to recover.…”

Section: Negative Feedback Effects Of Ocpsmentioning

confidence: 99%

“…Dissolved oxygen (DO) concentration is an important indicator of the health of a water body, a high DO concentration being key to maintaining a healthy aquatic ecosystem. − It is generally believed that a DO concentration of 3–5 mg L –1 or higher is required for a healthy aquatic ecosystem. , At DO concentrations <2 mg L –1 , fish will migrate to other areas, large benthic organisms will be replaced by small benthic organisms, and microscopic species will begin to dominate the plankton community. − Global warming and emissions of large amounts of pollutants since the industrial revolution have decreased DO concentrations in water bodies, including the oceans and coastal water. − The research on deoxygenation of freshwater ecosystems has also received attention in recent years. − …”

Section: Introductionmentioning

confidence: 99%

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Preliminary Study on the Dissolved Oxygen Recovery Process in Freshwater Ecosystems under the Coupling Effect of Oxygen-Consuming Pollutants and Temperature

et al. 2022

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Widespread deoxygenation of the oceans has caused great concern, but few large studies of changes in dissolved oxygen (DO) concentrations in freshwater ecosystems and the factors driving such changes have been performed. Here, DO and oxygen-consuming pollutant (OCP) data for freshwater ecosystems in China from 2008 to 2018 were used to assess changes in DO concentrations and the mechanisms involved. DO concentrations in freshwater ecosystems in China recovered markedly in the study period. The DO concentrations have linearly increased (R 2 = 0.95, p < 0.01) in that period. The chemical oxygen demand (CODMn) and NH3–N concentrations have significantly decreased [polynomial fitted curves (n = 2): R 2 = 0.77, p < 0.01 for CODMn and R 2 = 0.95, p < 0.01 for NH3–N]. The polynomial curves fitted to the CODMn, NH3–N, and DO data indicated that there are thresholds for oxygen-rich and deoxygenation processes dominated by OCPs in freshwater ecosystems. Decreasing OCP concentrations will not promote DO recovery if the CODMn and NH3–N concentrations are <4 and <0.4 mg L–1, respectively. The effect of temperature on the DO concentration in freshwater was obscured by inputs of large amounts of OCPs. The discovery of thresholds for the effect of OCPs led to the division of the DO recovery process into stages by increases in the temperature.

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“…A sufficient supply of dissolved oxygen (DO) is vital for maintaining nutrient biogeochemistry, − aquatic biodiversity, and drinking water quality, and for controlling greenhouse gas emissions. , The DO levels in freshwater ecosystems depend on processes such as atmospheric exchange, water circulation, and the balance between respiration and photosynthesis. , Dissolved oxygen levels are often lower in still water in lakes or ponds than in running water systems, such as rivers or streams. The levels of DO in water systems are influenced by physicochemical and biological processes, such as diffusion, aeration, photosynthesis, and respiration .…”

Section: Introductionmentioning

confidence: 99%

Recovery in Dissolved Oxygen Levels in Chinese Freshwater Ecosystems in the Past Three Decades

et al. 2022

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Deoxygenation is a serious problem in oceanic waters, but few studies have documented dissolved oxygen (DO) changes in freshwater systems. In this study, the changes in DO at the national scale were analyzed in the past 30 years. The results showed that the proportion of sites with DO greater than 5 mg L −1 increased from 29.1% in 2002 to 87.45% in 2020, and the proportion of sites with DO less than 2 mg L −1 decreased from 44% in 2001 to 0.2% in 2020. There was a change point in the DO levels in 2007. DO levels can recover benefit from reduction in the pollution load. Meanwhile, further improvement in DO is challenged by global warming and inefficiency of pollutant collection and treatment. There is no doubt that the Chinese freshwater system has basically crossed the first stage of pollution control and treatment, laying a foundation for entering the stage of ecological restoration.

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Dissolved oxygen deficits in a shallow eutrophic aquatic ecosystem (fishpond) – Sediment oxygen demand and water column respiration alternately drive the oxygen regime

Cited by 57 publications

References 36 publications

Ecological assessment of Burç Reservoir’s surface water (Turkey) using phytoplankton metrics and multivariate approach

Ecological assessment of Burç Reservoir’s surface water (Turkey) using phytoplankton metrics and multivariate approach

Preliminary Study on the Dissolved Oxygen Recovery Process in Freshwater Ecosystems under the Coupling Effect of Oxygen-Consuming Pollutants and Temperature

Recovery in Dissolved Oxygen Levels in Chinese Freshwater Ecosystems in the Past Three Decades

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