Nutrient regeneration from riverine high-molecular-weight dissolved organic matter through marine bacterial decomposition in a eutrophic coastal system: The Ariake Sea, Japan

Takasu, Hiroyuki; Uchino, Koji

doi:10.1016/j.seares.2021.102114

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…16 SRP and NH 4 + −N supply through DOM degradation may contribute to prolonging red tides in eutrophic coastal seas. 62 Meanwhile, in a light-eutrophic lake, although the lower labile and dominant recalcitrant DON levels induced higher LAP fractions from April to September in Lake Houguan (Figures 2B and 3B), this did not result in a strong organic N mineralization ability. First, lower DIN concentration was detected in Lake Houguan (Figure 4B,C).…”

Section: Decomposition Process Of Dom and The Regeneration Of Inorgan...mentioning

confidence: 86%

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Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

Wan

Cao

Song

et al. 2022

Environ. Sci. Technol.

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To explore the effect of different types of dissolved organic matter (DOM) decomposition on nutrient cycling pathways and the microbial loop, four lakes with different DOM sources were investigated monthly. In Lake Tangxun, Dolichospermum decay released highly labile dissolved organic nitrogen into the water column. This induced bacterial organic nitrogen decomposition, as indicated by the increased abundance of gltB, gltD, gdh, and glnA as well as aminopeptidase activity. Genes associated with dissimilatory nitrate reduction to ammonium further fueled ammonium accumulation, driving Microcystis blooms in the summer. In Lake Zhiyin, fish bait deposits (high nitrogen, similar to Dolichospermum detritus) also caused Microcystis blooms. Detritus from Microcystis decomposition then produced high levels of labile dissolved organic phosphorus, inducing phosphatase activity and increasing soluble reactive phosphorus concentrations from September to April in Lakes Tangxun and Zhiyin. The high refractory DOM from macrophytes in Lake Houguan led to insufficient nutrient availability, leading to nutrient mutualism between algae and bacteria. The high levels of labile dissolved organic carbon from terrestrial detritus in Lake Yandong increased bacterial biomass and production, resulting in low chlorophyll content due to the competitive relationship between algal and bacterial nutrient requirements. Therefore, different DOM compositions induce unique connections among available nutrients, algae, and bacteria in the microbial loop.

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Section: Decomposition Process Of Dom and The Regeneration Of Inorgan...mentioning

confidence: 86%

“…In the eutrophic Lake Chaohu, algal growth and decline contributed greatly to the DOM components, which were further mineralized and caused N and P regeneration and release . SRP and NH 4 + –N supply through DOM degradation may contribute to prolonging red tides in eutrophic coastal seas …”

Section: Discussionmentioning

confidence: 99%

Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

Wan

Cao

Song

et al. 2022

Environ. Sci. Technol.

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“…Water 2022, 14, x FOR PEER REVIEW 8 of 22 4. The remaining or supplemental fluxes function between the overlying water and surface sediments.…”

Section: Spatial Distributions Of Environmental Quality Parameters In...mentioning

confidence: 99%

“…Point source, defining any discernible and confined pollutant sources [1], is a primary route for loading the eutrophic substances to marine environments. While eutrophication refers to a status of nutrients, which are supplied exceeding the necessity [2][3][4][5], eutrophication induces phytoplankton blooms, particularly when temperature, light, and micronutrients (e.g., trace metals) also reach optimal levels for phytoplankton growth [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

C, N, and P Mass Balances in the Bottom Seawater–Surface Sediment Interface in the Reducing Environment due to Anoxic Water of Gamak Bay, Korea

Jeong

Kang

Cho

2022

Water

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Current mass balances of C, N, and P were estimated using a model (Fluxin = Fluxout + ΔFlux) from Gamak Bay, Korea, in August 2017, where eutrophication and reducing conditions are prevalent. To examine the current fluxes of particulate organic carbon (POC), nitrogen (PON), and phosphorus (POP), sinking and re-floating sediment traps were deployed, a sediment oxygen demand (SOD) chamber experiment and ex-situ nutrient incubation experiment were conducted, and Fick’s first law of diffusion was applied. The principal component analysis and cluster analysis were performed to identify the three groups of water masses based on the characteristics of the bay, including the effects of the reducing environment due to the anoxic water mass using 14 bottom water quality parameters. In the reducing environment (sampling point GA4), the SOD20 flux was 3047.2 mg O2/m2/d. Additionally, the net sinking POC flux was 861.0 mg C/m2/d, while 131.8% of the net sinking POC flux (1134.5 mg C/m2/d) was removed toward the overlying water. This indicates that the organic matter that had been deposited was decomposed as a flux of 273.6 mg C/m2/d. The net sinking PON flux was 187.9 mg N/m2/d, whereas 15.8% of the net sinking PON flux was eluted, and 84.2% remained in the surface sediments. The dissolved inorganic nitrogen (DIN) elution flux from the surface sediments consisted of NH4+ elution (33.7 mg N/m2/d) and NOx− elution (−4.1 mg N/m2/d) fluxes. Despite the net sinking POP flux being 26.0 mg P/m2/d, the 47.7 mg P/m2/d of DIP elution flux (179.5% of the net sinking POP flux) was eluted to the overlying water. Similar to C mass balance, the additional elution flux occurred. Therefore, severe eutrophication (16.5 of the Okaichi eutrophication index) with the lowest N:P ratio (2.6) in GA4 was noted. This indicates that not only the freshly exported organic matter to the surface sediments but also the biochemical processes under anoxic conditions played an essential role as a remarkable nutrient source–particularly P–for eutrophication in Gamak Bay, Korea.

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Contribution of riverine dissolved organic carbon to organic carbon decomposition in the Ariake Sea, Japan, a coastal area suffering from summer hypoxia

et al. 2022

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Nutrient regeneration from riverine high-molecular-weight dissolved organic matter through marine bacterial decomposition in a eutrophic coastal system: The Ariake Sea, Japan

Cited by 5 publications

References 31 publications

Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

C, N, and P Mass Balances in the Bottom Seawater–Surface Sediment Interface in the Reducing Environment due to Anoxic Water of Gamak Bay, Korea

Contribution of riverine dissolved organic carbon to organic carbon decomposition in the Ariake Sea, Japan, a coastal area suffering from summer hypoxia

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