Long-term and longitudinal nutrient stoichiometry changes in oligotrophic cascade reservoirs with trout cage aquaculture

Sheng-long, Jian; Yang, Liuyan; Li, Changzhong; Guan, Hongtao; Li, Kemao; Wang, Guojie; Wang, Zhenji

doi:10.1038/s41598-020-68866-7

Cited by 7 publications

(7 citation statements)

References 36 publications

(56 reference statements)

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“…higher than 22.6 (mean: 236.06), much higher than the current TN/TP of rivers in the Three Gorges Reservoir region and the upper Yangtze River Basin (Chen et al, 2022;Miao et al, 2020), indicating that although the improvement of TP has induced high TN/TP in the in ow rivers of GR, it did not alter the river TN/TP ratios, due to the uctuations of TN concentration (Fig. 2a).…”

Section: In Ux and E Ux Of Reservoir Nutrientsmentioning

confidence: 89%

Improvement in water pollution control alters reservoir nutrient stoichiometry of Guanting Reservoir in the Winter Olympic host cities, North China

Dai¹,

Huang

Lei

et al. 2022

Preprint

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Significant improvement in wastewater treatment is the most effective way for eutrophication control in semiarid regions. However, its effect on the nutrient status of the receiving water body has remained poorly considered and understood at broad temporal scales. Taking Guanting Reservoir (GR) in Hebei-Beijing (P. R. China) as an example, we present a study that links a continuous monitoring dataset for GR with corresponding estimates of human-induced nutrient discharges in its watershed from the year 2006 to 2019. We find that GR showed decreasing total nitrogen (TN), and total phosphorus (TP) concentrations and increasing TN/TP mass ratios, and the decreasing trend of TP was faster than that of TN. The improved municipal wastewater treatment capacity is mainly responsible for the decreasing TN, and TP concentrations and the increasing TN/TP ratios in GR, as phosphorus is easier to remove from wastewater than nitrogen. Although wastewater treatment capacity has improved, the observed TP of GR (93.7 μg L-1) is higher than the threshold value of harmful algae blooms occurring (50 μg L-1) in recent years (2016-2019). Given the potential ecological impact on aquatic biodiversity as well as ecosystem function of changes in TN/TP ratios and higher retention rate of TP (97.4%) compared with TN (93.1%) in GR, our findings highlight that future strategy for water pollution control should not only concentrate on more nutrient reduction efficiencies but attach importance to their stoichiometric balance to reduce the potential risk of eutrophication during the recovery of GR.

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Section: In Ux and E Ux Of Reservoir Nutrientsmentioning

confidence: 89%

Improvement in water pollution control alters reservoir nutrient stoichiometry of Guanting Reservoir in the Winter Olympic host cities, North China

Dai¹,

Huang

Lei

et al. 2022

Preprint

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“…The cascade reservoir system is approximately 300-km long and 800-m drop, and has an average annual runoff of 2.8 × 10 10 m 3 . All reservoirs are weekly or daily regulated reservoirs except for the upstream LYG, which is an annually regulated reservoir ( Miao et al, 2020 ). Detailed morphological characteristics of each cascade reservoir have been reported by Miao et al (2020) .…”

Section: Methodsmentioning

confidence: 99%

“…All reservoirs are weekly or daily regulated reservoirs except for the upstream LYG, which is an annually regulated reservoir ( Miao et al, 2020 ). Detailed morphological characteristics of each cascade reservoir have been reported by Miao et al (2020) . The cascade reservoir system is oligotrophic with a low TP and a high N:P ratio ( Miao et al, 2020 ).…”

Section: Methodsmentioning

confidence: 99%

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Hydrodynamics Regulate Longitudinal Plankton Community Structure in an Alpine Cascade Reservoir System

Liu

Sheng-long

et al. 2021

Front. Microbiol.

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Previous studies report significant changes on biotic communities caused by cascade reservoir construction. However, factors regulating the spatial–temporal plankton patterns in alpine cascade reservoir systems have not been fully explored. The current study explored effects of environmental factors on the longitudinal plankton patterns, through a 5-year-long study on the environmental factors and communities of phytoplankton and zooplankton in an alpine cascade reservoir system located upstream of Yellow River region. The findings showed that phytoplankton and zooplankton species numbers in the studied cascade reservoir system were mainly regulated by the hydrological regime, whereas nutrient conditions did not significantly affect the number of species. Abundance and biovolume of phytoplankton in cascade reservoirs were modulated by the hydrological regime and nutrient conditions. The drainage rate, N:P ratio, and sediment content in cascade reservoirs were negatively correlated with abundance and biovolume of phytoplankton. Abundance and biovolume of zooplankton were not significantly correlated with the hydrological regime but showed a strong positive correlation with nutrient conditions in cascade reservoirs. Shannon–Wiener index (H’) and the Pielou index (J) of phytoplankton were mainly regulated by the hydrological regime factors, such as drainage rate and sediment content in cascade reservoirs. However, temperature and nutrient conditions were the main factors that regulated the Shannon–Wiener index (H’) and the Pielou index (J) of zooplankton. Species number, abundance, and biovolume of phytoplankton showed a significant positive correlation with those of zooplankton. Hydrodynamics and nutrient conditions contributed differently in regulating community structure of phytoplankton or zooplankton. These findings provide an understanding of factors that modulate longitudinal plankton community patterns in cascade reservoir systems.

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“…For a comparison, cage aquaculture of O. mykiss in cascade reservoirs of the Yellow River in China released about 77 tonnes of TP at fish production of 13,800 tonnes [31]. This can be considered a minor nutrient enrichment from cage aquaculture due to a relatively small production scale, high water exchange rate related to high water flow, and management measures in the upstream Yellow River.…”

Section: B Impact Of Pollutant Loadsmentioning

confidence: 99%

Loads of Pollution to Lake Toba and Their Impacts

Lukman¹,

Hidayat²,

Subehi³

et al. 2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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Lakes provide various ecosystem services that support biotic habitats and human life. In contrast, many lakes in the world are degraded due to pollutant supply from surrounding areas and human activities in the lake. Lake Toba, which is the largest lake in Indonesia, has indicated a polluted condition. However, the source and load of each pollutant are not yet known. A study has been conducted to determine nutrient and organic load levels entering the lake represented by Total Phosphorus (TP) and Chemical Oxygen Demand (COD), respectively. Observations were carried out in November 2017 at 22 locations, i.e., at 12 inlet rivers debouching to the lake and 10 sites at the lake. The pollutant impact was assessed from water class criteria based on COD, waters trophic status based on TP, and vertical oxygen profile representing cage aquaculture (CA) and non-cage aquaculture (NCA) areas. Based on COD and government regulation number 82/2001, water quality at the lake inlets was class III and IV. In the lake area, water class in NCA was III, while in CA the water class tends to be III and IV. Estimated TP loading from the catchment area was 138 tonnes/yr, while that from cage aquaculture activity was 570.33 tonnes/yr. Pollutants have caused the worsening of water class, increasing water column anoxia in the hypolimnion layer and eutrophication in Lake Toba.

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Long-term and longitudinal nutrient stoichiometry changes in oligotrophic cascade reservoirs with trout cage aquaculture

Cited by 7 publications

References 36 publications

Improvement in water pollution control alters reservoir nutrient stoichiometry of Guanting Reservoir in the Winter Olympic host cities, North China

Improvement in water pollution control alters reservoir nutrient stoichiometry of Guanting Reservoir in the Winter Olympic host cities, North China

Hydrodynamics Regulate Longitudinal Plankton Community Structure in an Alpine Cascade Reservoir System

Loads of Pollution to Lake Toba and Their Impacts

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