Monitoring cooling water discharge using Lagrangian coherent structures: A case study in Daya Bay, China

Wang, Xing; Ni, Peitong; Zhan, Haigang

doi:10.1016/j.marpolbul.2013.07.056

Cited by 26 publications

(20 citation statements)

References 35 publications

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“…BCC spatial patterns were predominantly shaped by species sorting, but this effect was weaker in summer than in winter seawater. We found significant heterogeneity in the BCCs across the thermal gradients in both seasons, suggesting that in the thermal discharge area, i.e., where water is frequently exchanged with the surrounding seawater (current velocity, 0.05 to 0.10 m/s [28,29]), the high dispersal rates of bacterioplankton communities between specific habitats and the surrounding seawater did not induce mass effects with BCC homogenization across thermal gradients. The VPA revealed that in each season, the BCC variations across the thermal gradient were significantly explained by purely environmental factors rather than by geographic distances only, suggesting that species sorting played a more important role than the spatially dependent dilution role of surrounding seawater on the thermal effluent water in generating BCC spatial patterns across thermal gradients.…”

Section: Discussionmentioning

confidence: 87%

“…After going through the cooling systems, heated water is released back into the same water body at a unified outlet site away from the intake points. The velocity of thermal effluents at the outlet site is about 2.0 m/s (3,28,29). By the influence of currents, the velocity of effluents is slowed down, with a mean velocity of about 0.08 m/s in the discharge area (3,28,29).…”

Section: Methodsmentioning

confidence: 99%

“…There are strong seasonal differences in both hydrologic and environmental conditions in the area studied. For instance, compared to summer, winter is usually characterized by hydrologic conditions of a higher tide level and higher current velocity but lower wind speed (6,28,29) and has the environmental traits of lower temperatures but higher concentrations of dissolved oxygen (DO) (2,3). We used a metacommunity approach (17,18,22) as a logical framework for studying the impact of the environmental conditions and dispersal-related processes underlying bacterioplankton assembly (30,31).…”

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confidence: 99%

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Bacterioplankton Metacommunity Processes across Thermal Gradients: Weaker Species Sorting but Stronger Niche Segregation in Summer than in Winter in a Subtropical Bay

Ren

Song

et al. 2019

Appl Environ Microbiol

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Thermal effluents from nuclear power plants greatly change the environmental and ecological conditions of the receiving marine water body, but knowledge about their impact on microbial ecology is limited. Here we used high-throughput sequencing of the 16S rRNA gene to examine marine bacterioplankton metacommunity assembly across thermal gradients in two representative seasons (i.e., winter and summer) in a subtropical bay located on the northern coast of the South China Sea. We found high heterogeneity in bacterioplankton community compositions (BCCs) across thermal gradients and between seasons. The spatially structured temperature gradient created by thermal effluents was the key determinant of BCCs, but its influence differed by season. Using a metacommunity approach, we found that in the thermal discharge area, i.e., where water is frequently exchanged with surrounding seawater and thermal effluent water, the BCC spatial patterns were shaped by species sorting rather than by mass effects from surrounding seawater or by dilution of thermal effluent water by surrounding seawater. However, this effect of species sorting was weaker in summer than in winter seawater. In both seasons, the bacterioplankton community structure was predominately determined by niche sharing; however, the relative importance of niche segregation was enhanced in summer seawater. Our findings suggest that for the seasonal differences in metacommunity processes, the BCCs of subtropical summer seawater were more sensitive to temperature and were more difficult to predict than those of winter seawater in the face of different intensities of thermal impacts. IMPORTANCE Understanding the mechanisms of bacterial community assembly across environmental gradients is one of the major goals of marine microbial ecology. Thermal effluents from two nuclear power plants have been present in the subtropical Daya Bay for more than 20 years and have generated a comparatively stable and long thermal gradient (a temperature increase from 0 to 10°C). The environmental patches across thermal gradients are heterogeneous and very strongly interconnected on a microbial scale; thus, this is a useful model for the study of the metacommunity processes (i.e., patch dynamics, species sorting, mass effects, and neutral processes) that underlie marine bacterioplankton assembly. The significance of our research is to reveal how environmental conditions and dispersal-related processes interact to influence bacterioplankton metacommunity processes and their seasonal differences across thermal gradients. Our results may advance the understanding of marine microbial ecology under future conditions of global warming.

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Section: Discussionmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Bacterioplankton Metacommunity Processes across Thermal Gradients: Weaker Species Sorting but Stronger Niche Segregation in Summer than in Winter in a Subtropical Bay

Ren

Song

et al. 2019

Appl Environ Microbiol

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“…In fact, the process and extent of transport and diffusion of the nutrients, as well as the scope of pollution that leads to the eutrophication in water bodies are still problems that concern water environment management departments a lot. Influenced by the topography, tide and wind, water exchange in Daya Bay is extremely non-fluent [8], a phenomenon that makes the nutrients easily accumulate in water bodies. Considering the above, this study aims to understand the whole diffusion process of nutrients from the sediments to sea water and will supply a theoretical basis for managing the ocean environment.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of Nitrogen and Phosphorus Across the Sediment-Water Interface and In Seawater at Aquaculture Areas of Daya Bay, China

Cheng

Zeng

Guo

et al. 2014

IJERPH

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With the yearly increasing marine culture activities in floating cages in Daya Bay, China, the effects of pollution may overlap and lead to more severe water environmental problems. In order to track the impacts of the marine culture in floating cages on water environment, sediments and overlying water were sampled by cylindrical samplers at three representative aquaculture areas of Daya Bay. The water content, porosity, density of sediments as well as the vertical distributions of ammonia nitrogen and active phosphate in pore water along sediments depth were measured. The release rate and annual released quantity of the nutrients across sediment-water interface were calculated using Fick’s Law. A horizontal two-dimensional mathematical model was developed to compute the spatial and temporal distributions of the nutrients in seawater after being released across the sediment-water interface. The results showed that the sediments, with a high content and a large annual released quantity of nitrogen and phosphorus, constitute a potential inner source of seawater pollution. Influenced by tide and water depth, the scope of diffusion and migration of the nutrients appears as a long belt which is about 1 km long and 50 m wide. Seawater in this area is vulnerable to eutrophication.

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“…These sediments now constitute a potential source of contaminants for the water column that could alter the water quality and threaten aquatic organisms [20]- [30]. Understanding the processes controlling the dynamics of contaminants in the sediment, improving our knowledge of the environmental risk induced by contaminated sediments and appropriately orientating the action of politics and managers, is thus a challenge for the next decades [31].…”

Section: Introductionmentioning

confidence: 99%

Nutrient Fluxes and Sediments Composition in El Mex Bay and Surround Drains, Alexandria, Egypt

Shreadah¹,

Masoud²,

Khattab³

et al. 2015

AJAC

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Monitoring cooling water discharge using Lagrangian coherent structures: A case study in Daya Bay, China

Cited by 26 publications

References 35 publications

Bacterioplankton Metacommunity Processes across Thermal Gradients: Weaker Species Sorting but Stronger Niche Segregation in Summer than in Winter in a Subtropical Bay

Bacterioplankton Metacommunity Processes across Thermal Gradients: Weaker Species Sorting but Stronger Niche Segregation in Summer than in Winter in a Subtropical Bay

Diffusion of Nitrogen and Phosphorus Across the Sediment-Water Interface and In Seawater at Aquaculture Areas of Daya Bay, China

Nutrient Fluxes and Sediments Composition in El Mex Bay and Surround Drains, Alexandria, Egypt

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