Effects of nitrogen and phosphorus enrichment on growth and photosynthetic assimilation of carbon in a green tide-forming species (Ulva prolifera) in the Yellow Sea

Li, Shaoxiang; Yu, Kefeng; Huo, Yuanzi; Zhang, Jianheng; Cai, Chuner; Liu, Yuanyuan; Shi, Dingji; He, Peimin

doi:10.1007/s10750-016-2749-z

Cited by 36 publications

(5 citation statements)

References 43 publications

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“…~2,000 g wet weight) removing significant concentrations of nitrogen based nutrients from the system relative to the density of the stocked fish, it absorbed little in the way of phosphorus based nutrients. Such a result is consistent with findings in the literature which states Ulva species as having a lower affinity for and slower uptake of phosphorus when compared with nitrogen [13], [14]. It is therefore suggested that finfish aquaculture operations may see a benefit in culturing macroalgae species with a strong affinity for phosphorus compounds in tandem with U. intestinalis as a means to uptake the full spectrum of eutrophying dissolved compounds produced by finfish effluent.…”

Section: Discussionsupporting

confidence: 90%

Filtration of Dissolved Organic Nutrients From Fish Farm Wastewater Using a Macroalgae Biofilter

Hall

Martin

2021

WIT Transactions on Ecology and the Environment

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Intensive animal aquaculture damages the environment by releasing large quantities of nutrients which drives eutrophication in aquatic ecosystems. Macroalgae are efficient in uptaking nutrients as they grow with past studies suggesting their integration into aquaculture systems as a means to improve wastewater quality. This study was designed to assess the feasibility of using macroalgae as a biological filtration system for the removal of dissolved nutrients found in finfish farm wastewater. To test this, an experimental fish farm and mesocosm system was established on the northern coast of Saaremaa island, West Estonian archipelago. The green algae Ulva intestinalis was selected as a good candidate to assess the efficacy of a macroalgae biofiltration system to uptake nutrients. The results obtained show at best a 18-25% reduction in waste water nutrient concentrations for the nitrogenous compounds nitrite and nitrate for mesocosms stocked with macroalgae compared with the control. The system experienced an average 60% reduction in nitrogen and phosphorus concentrations in wastewater outflow compared to concentrations present within the finfish mesocosm. Additionally, the subsequent biomass gain of the incubated macroalgae species Ulva intestinalis is reported to be 4% per day at its maximum rate. The results obtained in this study indicate that Ulva intestinalis can be integrated into aquaculture systems as a nitrogen biofilter. In addition, the macroalgae biomass produced may offer aquaculture operations an additional income stream improving farm economics.

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Section: Discussionsupporting

confidence: 90%

Filtration of Dissolved Organic Nutrients From Fish Farm Wastewater Using a Macroalgae Biofilter

Hall

Martin

2021

WIT Transactions on Ecology and the Environment

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“…Nitrogen and phosphorus are two essential nutrients for the growth of U. prolifera [ 63 , 64 ]. The maximum growth rate of U. prolifera can reach 56% day −1 with sufficient N and P supplies [ 4 ].…”

Section: Anthropogenic Perturbations and Macroalgal Bloomsmentioning

confidence: 99%

Ulva prolifera green-tide outbreaks and their environmental impact in the Yellow Sea, China

Zhang

et al. 2019

National Science Review

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181

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The Ulva prolifera green tides in the Yellow Sea, China, which have been occurring since 2007, are a serious environmental problem attracting worldwide attention. Despite extensive research, the outbreak mechanisms have not been fully understood. Comprehensive analysis of anthropogenic and natural biotic and abiotic factors reveals that human activities, regional physicochemical conditions and algal physiological characteristics as well as ocean warming and biological interactions (with microorganism or other macroalgae) are closely related to the occurrence of green tides. Dynamics of these factors and their interactions could explain why green tides suddenly occurred in 2007 and decreased abruptly in 2017. Moreover, the consequence of green tides is serious. The decay of macroalgal biomass could result in hypoxia and acidification, possibly induce red tide and even have a long-lasting impact on coastal carbon cycles and the ecosystem. Accordingly, corresponding countermeasures have been proposed in our study for future reference in ecosystem management strategies and sustainable development policy.

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“…In addition to ocean acidification, coastal regions receive inputs of excess nitrogen from aquaculture, agriculture, wastewater treatment, and the burning of fossil fuels [ 6 , 7 ]. Excess nitrogen is the commonly regarded cause for green algal blooms world-wide, and they are typically dominated by macroalgae from the genus Ulva [ 8 – 10 ]. Green algal blooms can impose negative effects on their ecosystems and local human communities by decreasing biodiversity and ecosystem services [ 11 – 14 ].…”

Section: Introductionmentioning

confidence: 99%

Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment

et al. 2017

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The responses of macroalgae to ocean acidification could be altered by availability of macronutrients, such as ammonium (NH4+). This study determined how the opportunistic macroalga, Ulva australis responded to simultaneous changes in decreasing pH and NH4+ enrichment. This was investigated in a week-long growth experiment across a range of predicted future pHs with ambient and enriched NH4+ treatments followed by measurements of relative growth rates (RGR), NH4+ uptake rates and pools, total chlorophyll, and tissue carbon and nitrogen content. Rapid light curves (RLCs) were used to measure the maximum relative electron transport rate (rETRmax) and maximum quantum yield of photosystem II (PSII) photochemistry (Fv/Fm). Photosynthetic capacity was derived from the RLCs and included the efficiency of light harvesting (α), slope of photoinhibition (β), and the light saturation point (Ek). The results showed that NH4+ enrichment did not modify the effects of pH on RGRs, NH4+ uptake rates and pools, total chlorophyll, rETRmax, α, β, Fv/Fm, tissue C and N, and the C:N ratio. However, Ek was differentially affected by pH under different NH4+ treatments. Ek increased with decreasing pH in the ambient NH4+ treatment, but not in the enriched NH4+ treatment. NH4+ enrichment increased RGRs, NH4+ pools, total chlorophyll, rETRmax, α, β, Fv/Fm, and tissue N, and decreased NH4+ uptake rates and the C:N ratio. Decreased pH increased total chlorophyll content, rETRmax, Fv/Fm, and tissue N content, and decreased the C:N ratio. Therefore, the results indicate that U. australis growth is increased with NH4+ enrichment and not with decreasing pH. While decreasing pH influenced the carbon and nitrogen metabolisms of U. australis, it did not result in changes in growth.

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Effects of nitrogen and phosphorus enrichment on growth and photosynthetic assimilation of carbon in a green tide-forming species (Ulva prolifera) in the Yellow Sea

Cited by 36 publications

References 43 publications

Filtration of Dissolved Organic Nutrients From Fish Farm Wastewater Using a Macroalgae Biofilter

Filtration of Dissolved Organic Nutrients From Fish Farm Wastewater Using a Macroalgae Biofilter

Ulva prolifera green-tide outbreaks and their environmental impact in the Yellow Sea, China

Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment

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