Phytoplankton community structural reshaping as response to the thermal effect of cooling water discharged from power plant

Xu, Duo; Wang, Hao; Han, Dongyun; Chen, Aiting; Niu, Yunxia

doi:10.1016/j.envpol.2021.117517

Cited by 18 publications

(10 citation statements)

References 52 publications

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“…gracilis/MnO x promoted cellular photosynthetic activity at ambient temperature (28 °C). Marine heatwaves (MHWs) have occurred frequently in recent years and affect carbon fixation and capture in the ocean. , The growth and photosynthesis of C. gracilis/MnO x at an elevated temperature (30 °C) were investigated.…”

Section: Resultsmentioning

confidence: 99%

Self-Assembled Nanoscale Manganese Oxides Enhance Carbon Capture by Diatoms

Hou

2022

Environ. Sci. Technol.

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Continuous CO2 emissions from human activities increase atmospheric CO2 concentrations and affect global climate change. The carbon storage capacity of the ocean is 20-fold higher than that of the land, and diatoms contribute to approximately 40% of carbon capture in the ocean. Manganese (Mn) is a major driver of marine phytoplankton growth and the marine carbon pump. Here, we discovered self-assembled manganese oxides (MnO x ) for CO2 fixation in a diatom-based biohybrid system. MnO x shared key features (e.g., di-μ-oxo-bridged Mn–Mn) with the Mn4CaO5 cluster of the biological catalyst in photosystem II and promoted photosynthesis and carbon capture by diatoms/MnO x . The CO2 capture capacity of diatoms/MnO x was 1.5-fold higher than that of diatoms alone. Diatoms/MnO x easily allocated carbon into proteins and lipids instead of carbohydrates. Metabolomics showed that the contents of several metabolites (e.g., lysine and inositol) were positively associated with increased CO2 capture. Diatoms/MnO x upregulated six genes encoding photosynthesis core proteins and a key rate-limiting enzyme (Rubisco, ribulose 1,5-bisphosphate carboxylase–oxygenase) in the Calvin–Benson–Bassham carbon assimilation cycle, revealing the link between MnO x and photosynthesis. These findings provide a route for offsetting anthropogenic CO2 emissions and inspiration for self-assembled biohybrid systems for carbon capture by marine phytoplankton.

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Section: Resultsmentioning

confidence: 99%

Self-Assembled Nanoscale Manganese Oxides Enhance Carbon Capture by Diatoms

Hou

2022

Environ. Sci. Technol.

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“…First, detrended correspondence analysis (DCA) was performed to get the gradient length of the first axis (3.025), which means redundancy analysis (RDA) was suitable for further analysis (Yang et al, 2022). Redundancy analysis (RDA) is a linear model which has been widely used to investigate the relationships between environmental factors and phytoplankton compositions (Tian et al, 2021;Xu et al, 2021). Prior to that, environmental factors, except pH, were converted by lg (x+1) to meet normality and homoscedasticity conducting a Monte Carlo permutation test (p < 0.05), and the abundance data of the dominant species were converted by Hellinger (Yan et al, 2020;Sánchez et al, 2021), Subsequently, the variance inflation factor (VIF) was calculated with the transformed explanatory variables to reduce the collinearity effects, which were eliminated with the VIF over 10 ( Wu et al, 2018).…”

Section: Statistical Analysis and Drawingmentioning

confidence: 99%

Niche and interspecific association with respect to the dominant phytoplankton species in different hydrological periods of Lake Wuchang, China

Meng

Chen

Liu

et al. 2022

Front. Environ. Sci.

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In aquatic ecosystems, the dynamics of ecological parameters play an important role in community organizations. To understand the seasonal variation in the phytoplankton community in Lake Wuchang, Anhui Province, water samples were collected in three different hydrological periods (dry season, normal season, and wet season) from December 2019 to August 2020. The dominance value (Y), niche width (Bi), niche overlap (Oij), variance ratio method (VR), chi-squared test (χ2), and association coefficients were used to analyze the niche and interspecific association with respect to the dominant phytoplankton species in different hydrological periods, while the redundancy analysis method (RDA) was used to distinguish the key driving environmental factors for the dominant phytoplankton species. The results showed that 308 species belonging to 8 phyla were identified, of which 13 species from 4 phyla were the dominant species. From the dry season to wet season, the dominant species changed from Bacillariophyta to Cyanophyta, while Synedra acus was the dominant species throughout the hydrological periods. The niche width of the dominant species varied from 1.77 to 6.65, and the niche width of Dinobryon was the lowest, while that of Synedra acus was the highest. The niche overlap showed temporal and spatial differences, of which 30 dominant species pairs were greater than 0.600, indicating that they occupied the environmental resources in a highly similar way. The interspecific association results showed that there was a significant positive correlation between the dominant species, especially in normal and wet seasons. Only 10 of the 48 dominant species pairs had significant associations based on the χ2 test, and two pairs had negative associations in the wet season, which might be related to the hydrological condition in the wet season. According to redundancy analysis, NO3−-N, NH4+-N, PO43--P, water depth (WD), and water temperature (WT) were the key environmental factors affecting the phytoplankton community variation in Lake Wuchang. This paper provides a new perspective for the study of the early warnings regarding the cyanobacteria bloom outbreak, and the management and protection of the water ecological environment in shallow lakes in the middle and lower reaches of the Yangtze River.

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“…Initial productivity refers to the ability of primary producers in the ocean (e.g., phytoplankton), to generate organic matter through photosynthesis. Previous studies have focused on the temperature difference between thermal discharges and ambient water (Roy et al, 2021), seasonal variations from changing thermal discharges (Lin et al, 2021), and the effects of thermal discharge on ecosystems (Dong et al, 2021;Xu et al, 2021). Numerical models have been improved to consider the elevation of temperature in water bodies near power plants (Zhu, 2007;He et al, 2008;Salgueiro et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Influences of Tidal Flat and Thermal Discharge on Heat Dynamics in Xiangshan Bay

Kong

Guan

2022

Front. Mar. Sci.

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Water temperature in estuaries is sensitive to thermal discharges and expansive tidal flats; as such, this parameter is essential in maintaining estuarine ecosystem. Semi-enclosed water bodies with poor water exchange easily accumulate heat. This is especially true for Xiangshan Bay, which contains two power plants and a large area of tidal flats. This bay was used as an example to study water temperature and heat dynamics, considering the thermal discharge and tidal flats. This study developed and validated a three-dimensional hydro-heat flux numerical model using field data on tidal elevation, currents, water temperature, and tidal flat temperature. The Finite Volume Community Ocean Model combines an accurate thermal discharge model with the air-water-tidal flat heat flux model. The findings showed that thermal discharge provides heat to the bay in summer and winter, and increases the water temperature of the entire bay by 0.7°C in summer, while maintaining water temperature at 0.52°C in winter. The atmosphere and open seas had greater impacts on heat in the bay in winter and summer. The atmosphere and tidal flats provided heat to the bay in summer and absorbed heat from the bay during winter; the opposite was true for the open sea. The effect of tidal flats in summer is less than that in winter, and provides 1.31 × 1013 J of heat to the bay in summer, while taking 8.63 × 1013 J of heat from the bay in winter. This study provides a comprehensive understanding of the effects of tidal flats and thermal discharge on water temperature and heat in macro-tidal bays and estuaries; its results are applicable to similar bays around the world.

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Phytoplankton community structural reshaping as response to the thermal effect of cooling water discharged from power plant

Cited by 18 publications

References 52 publications

Self-Assembled Nanoscale Manganese Oxides Enhance Carbon Capture by Diatoms

Self-Assembled Nanoscale Manganese Oxides Enhance Carbon Capture by Diatoms

Niche and interspecific association with respect to the dominant phytoplankton species in different hydrological periods of Lake Wuchang, China

Influences of Tidal Flat and Thermal Discharge on Heat Dynamics in Xiangshan Bay

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