Quantitative assessment of the effects of human activities on phytoplankton communities in lakes and reservoirs

Zhao, Chang; Shao, Nan; Yang, Shengtian; Ren, H.; Ge, Yingchun; Zhang, Z.S.; Feng, Peijun; Liu, W.L.

doi:10.1016/j.scitotenv.2019.02.117

Cited by 40 publications

(12 citation statements)

References 106 publications

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“…With human intervention, an increasing number of rivers confront problems of eutrophication and excessive algal blooms (Zhao et al, 2019), but little attention has been paid to this issue. And almost nobody noted the chl‐a transverse distribution in rivers.…”

Section: Resultsmentioning

confidence: 99%

Transverse distribution of cyanobacteria in a regulated urban river

Yan

Wang

et al. 2021

Ecohydrology

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River eutrophication and CyanoHABs are severe problems that are often ignored because of high current speed and strong self‐purification. In this paper, Liangxi River, Taihu Basin, was selected as the research area. Combined with field investigation, a 2D water environment mathematical model was developed to simulate the chl‐a distribution in Liangxi River. An indicator (Transverse Distribution Center, TDC) and its normalized form (NTDC) to quantitatively represent material transverse distribution in rivers is proposed and coupled in the model. The calculation showed that TDC and NTDC had the property of random fluctuation, seasonal consistency, and water transfer dependence. The multiple regression equation with normalized data indicated that the maximum offset, average variation rate, and average reverting rate of Liangxi River chl‐a NTDC were most affected by the chl‐a dry matter flux ratio between tributaries and the mainstream, followed by flow and chl‐a concentration ratio. From the perspective of river morphology, for different river width change modes and river bending directions, when water flows into and out of these river sections, the chl‐a transverse distribution is subject to different specific effects. In addition, the position of nutrients and dissolved oxygen significantly affected the position of chl‐a growth when the N/P ratio was not very high. Conversely, a high N/P ratio may contribute to decrease of the chl‐a concentration. Proliferation with abundant nutrients may cause the settlement of chl‐a resulting in a decrease of chl‐a in the water column.

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Section: Resultsmentioning

confidence: 99%

Transverse distribution of cyanobacteria in a regulated urban river

Yan

Wang

et al. 2021

Ecohydrology

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“…TN and TP are the two most important indices of the eutrophication of water bodies [ 32 ], while COD Mn is an indicator of organic pollution [ 33 ]. Higher values of these indices promote the proliferation of phytoplankton and outbreak of cyanobacterial blooms [ 34 ]. Cyanobacteria can produce abundant toxic secondary metabolites, such as dermatoxins, hepatotoxins, and cytotoxins [ 35 ], which affect the feeding, growth, and immunity of exposed cultured species [ 36 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of Submerged Macrophytes on the Growth, Morphology, Nutritional Value, and Flavor of Cultured Largemouth Bass (Micropterus salmoides)

et al. 2022

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Aquaculture environment plays important roles in regulating the growth, morphology, nutrition, and flavor of aquatic products. The present study investigated growth, morphology, nutrition, and flavor formation in largemouth bass (Micropterus salmoides) cultured in the ponds with (EM group) and without (M group) the submerged macrophytes (Elodea nuttallii). Fish in the EM group showed a significantly greater body length, higher growth rate, and lower hepatosomatic index than those in the M group (p< 0.05). Moreover, compared with fish in the M group, those in the EM group showed improved muscle quality with significantly elevated levels of crude protein, total free and hydrolysable amino acids, and polyunsaturated fatty acids (p < 0.05). Specifically, certain amino acids related to flavor (Glu, Asp, Ala, and Arg) and valuable fatty acids (C18:2, C18:3n3, C20:3n3, and C22:6) were more abundant in the EM group (p < 0.05). In addition, the levels of 19 volatile (p < 0.05) were significantly higher in the EM group than in the M group. Therefore, E. nuttallii significantly improved growth, morphological traits, nutritional components, and characteristic flavor in largemouth bass, indicating the superior nutritional value and palatability of fish cultured with submerged macrophytes.

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“…Algal bloom is a serious problem threatening the health of aquatic ecosystem. The sewage with high nitrogen and phosphorus load caused by human activity, is released into the natural water, resulting in the unlimited growth of algae (Zhao et al, 2019). In the most freshwater ecosystem, the dominant phytoplankton community during algal bloom period were toxic cyanobacteria, such as Microcystis aeruginosa and Aphanizomenon flos-aquae (Major et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Liangxi river is also an urban river which suffered highly nutrient load from waste water, tributaries and urban runoff due to the development of urbanization in Wuxi city in recent decades. The local condition is suitable for algal growth and might change the phytoplankton community composition (Zhao et al, 2019). So, external algal input and in-situ proliferation, which one contributes more on algal distribution in Liangxi river?…”

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confidence: 99%