Role of nutrients in the development of floating green tides in the Southern Yellow Sea, China, in 2017

Zhang, Haibo; Su, Rongguo; Shi, Xiaoyong; Zhang, Chuansong; Yin, Hang; Zhou, Yuke; Wang, Guoshan

doi:10.1016/j.marpolbul.2020.111197

Cited by 35 publications

(10 citation statements)

References 62 publications

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“…The PLS‐SEM was used to analyze the possible influential pathways of SA:VOL in physiological functional traits by SmartPLS 3.3 (SmartPLS GmbH). The environmental data referred to previous studies (Guan et al, 2021 ; Wang et al, 2018 ; Zhang, Su, et al, 2020 ).…”

Section: Methodsmentioning

confidence: 99%

“…Environmental conditions are significantly different during the northward drifting of green tides (Zhang, Su, et al, 2020 ). Nutrient enrichment has occurred in most of the coastal waters in the southern Yellow Sea over the last decade; the contents of dissolved inorganic nitrogen (DIN) and phosphate–phosphorus (PO 4 3− ‐P) have increased significantly ( State Oceanic Administration , 2007–2019).…”

Section: Introductionmentioning

confidence: 99%

“…DIN and PO 4 3− ‐P south of 35°N were significantly higher than those north of 35°N (Guan et al, 2021 ). Locations south of 35°N provided 96% of the nitrogen and 87% of the phosphorus for the development of green tides (Zhang, Su, et al, 2020 ). Meanwhile, latitudes around 35°N in the Yellow Sea generated approximately 80% of the green tide biomass (Zhang, Wang, et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Physiological functional traits explain morphological variation of Ulva prolifera during the drifting of green tides

Chen

Zhao

et al. 2022

Ecology and Evolution

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Ulva prolifera green tides, one of the greatest marine ecological disasters, originate in the southern Yellow Sea of China and obtain the highest biomass in Haizhou Bay (latitude around 35° N) during northward drift. U. prolifera shows different morphologies from southern Haizhou Bay (SH) to northern Haizhou Bay (NH). Owing to the distinct nutrient environments between SH and NH, we hypothesized that thalli in NH with poor nutrients increased the surface area to volume ratio (SA:VOL) to better absorb nutrients. Here, we tested this hypothesis by comparing the SA:VOL of thalli in SH and NH. The results showed that the thalli in NH had a lower SA:VOL than those in SH, and SA:VOL had positive relationships with temperature and nutrients, contrary to the general hypothesis. The novel results suggested that morphological differences of U. prolifera were the result of developmental state rather than environmental acclimation. Indicators of reproduction (reproductive allocation ratio) were negatively related to variation in tissue contents of C, N, P, and crude protein, whereas indicators of growth (tissue contents of C, N, P, and crude protein) showed significant positive influences on SA:VOL. The results indicated that a trade‐off relationship between reproduction and growth existed in the northward drift. All the results suggested that physiological functional traits affected morphological variation of U. prolifera in different environmental conditions during the drifting of green tides. This study presents new insights into the opportunist species nature of U. prolifera through morphological variation and associated functional consequences.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physiological functional traits explain morphological variation of Ulva prolifera during the drifting of green tides

Chen

Zhao

et al. 2022

Ecology and Evolution

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“…2). Prior studies (Li et al 2017;Chen et al 2020;Zhang et al 2020) also suggest that precipitation and subsequent freshwater runoff are crucial to nutrient delivery on the Jiangsu coast. Riverine nutrient import into the coastal ocean is a function of river discharge and riverine nutrient concentration, and the latter depends on a variety of anthropogenic activities in the drainage area (Liu et al 2009).…”

Section: Hydrological Vs Anthropogenic Influences On Nutrient Inputmentioning

confidence: 98%

Unraveling seasonal and interannual nutrient variability shows exceptionally high human impact in eutrophic coastal waters

Jiang

Wang

et al. 2023

Limnology & Oceanography

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Nutrient import into eutrophic estuarine‐coastal zones is modulated by river discharge and anthropogenic activities (agriculture, industry, sewage, etc.). Comparing anthropogenic vs. hydrological influences on nutrient loading is important for ecosystem managers but has been a long‐standing challenge. As an attempt to fill this gap, a retrospective study was conducted using multiyear (2012–2022) data in one of the most eutrophic coastal seas in China, the Jiangsu coastal waters. Of the two main pollutants on the Jiangsu coast, dissolved inorganic nitrogen (DIN) is extremely overloaded relative to phosphate (PO4). Their spatial distribution shows clear terrestrial sources as concentrations decrease offshore. Although in each survey DIN and PO4 are enriched in low‐salinity waters, their spatially averaged concentrations are out of phase with river discharge on the seasonal and interannual scales. A box model was applied to decompose contributions of river discharge and nutrient import by anthropogenic activities. Results show that the human impacts on the interannual nutrient variability exceed those of hydrological factors on the Jiangsu coast. Anthropogenic nutrient loading decreases during 2012–2020, paralleled with the reduced fertilizer use and other nonpoint sources. Sporadic nutrient fluxes from point sources are likely responsible for the aseasonal nutrient‐rich patches. Our study demonstrates that water quality in the Jiangsu coastal waters is highly affected by anthropogenic activities. Findings in this study have broad implications for local monitoring strategies and restoration efforts and provide insight into assessing human stress from field data in global eutrophic ecosystems.

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“…In addition, algae blooming such as red tides and green tides often occurred at the estuary, due to a large amount of nitrogen and phosphorus pollution accumulated. For example, since 2007, the green tide of Ulva prolifera disasters have consecutively occurred in the Yellow Sea at the turn of spring and summer for 15 years, which has severely affected the coastal marine ecosystem, caused huge economic losses, and affected sustainable development [8,9]. Therefore, the nitrogen and phosphorus emission fluxes of major rivers need to be concerned to ensure river water quality and water resources allocation, as well as estuary ecological safety.…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Patterns and the Fluxes of Regional Nutrient Pollution in the Pearl River Basin, China

Wu¹,

Sun²,

Zhang³

et al. 2022

Pol. J. Environ. Stud.

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Anthropogenic activities have had a great impact on the characteristics of watershed pollution. The Pearl River basin is the third largest river in China, but it has been affected by eutrophication impact for a long time. This study comprehensively evaluated the nutrient pollution characteristics of the Pearl River basin from 2016 to 2018. The result shows that the ratio of total nitrogen (TN) and total phosphorus (TP), TN/TP was 24.7 of the Pearl River basin, which indicated that phosphorus was the restrictive factor for eutrophication problems. The limitation of TP maybe caused that TN is difficult to decrease through denitrification and nitrification. The fluxes of TN and TP remained stable in recent 20 years, and the flux of TN and TP transferred from the Pearl River basin to the ocean was 6.86×10 5 and 2.84×10 4 t in 2017, respectively. The Pearl River estuary had the largest discharge, accounting for more than 40% of the Pearl River basin. The TN in the West River and North River had a high pollution load, while TP pollution in the East River was very serious. It is necessary to establish an effective mechanism to control nitrogen and phosphorus. A large amount of nitrogen and phosphorus caused the decrease of dissolved oxygen (DO) and the increase of chemical oxygen demand (COD), which aggravated eutrophication. This study of nutrient elements fluxes and distribution in the Pearl River Basin are one of the important prerequisites for clarifying the causes of eutrophication, providing data and theoretical support for further water pollution control and water environmental protection in the future, and also providing a basis for pollution control decisions.

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Role of nutrients in the development of floating green tides in the Southern Yellow Sea, China, in 2017

Cited by 35 publications

References 62 publications

Physiological functional traits explain morphological variation of Ulva prolifera during the drifting of green tides

Physiological functional traits explain morphological variation of Ulva prolifera during the drifting of green tides

Unraveling seasonal and interannual nutrient variability shows exceptionally high human impact in eutrophic coastal waters

Spatio-Temporal Patterns and the Fluxes of Regional Nutrient Pollution in the Pearl River Basin, China

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