Using alkaline phosphatase activity as a supplemental index to optimize predicting algal blooms in phosphorus-deficient lakes: A case study of Lake Taihu, China

Ma, Jing; Wang, Peifang; Ren, Lingxiao; Wang, Xun; Paerl, Hans W.

doi:10.1016/j.ecolind.2019.04.043

Cited by 33 publications

(20 citation statements)

References 72 publications

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“…The accumulation ability of inorganic phosphate and DOP by typical cyanophyta and chlorophyta species has been investigated in our previous study (Ren et al 2017), which could bene t their competitive strategy and growth. Therefore, TDP in the overlying water of SAW system was drawn down by the nutritional needs of M. aeruginosa, which explained why some natural waters with low P content still exhibited outbreaks of cyanobacterial blooms (Cao et al 2016;Ma et al 2019). Our results also indicated the synergistic effect between cyanobacterial growth and P release from sediment.…”

Section: Effects Of Cyanobacteria On P Mobilitymentioning

confidence: 52%

“…It was consistent with Hiatt et al (2018), who pointed that periphytic-APA was inhibited with faster velocity and expression of enzyme activity was higher in static waters. Ma et al (2019) used APA as a supplemental index to predict HABs in Lake Taihu and obtained similar results. However, the negative effects of stronger hydrodynamic conditions on APA was also probably due to the greater release of IP from sediment, as higher APA re ected an alternative pathway for acquiring IP by algae.…”

Section: Effects Of Hydrodynamic Conditions On Cyanobacteriamentioning

confidence: 69%

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Processes and mechanisms of phosphorus mobility among sediment, water, and cyanobacteria under hydrodynamic conditions

Ren

Ding

et al. 2021

Environ Sci Pollut Res

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Phosphorus (P) has an important role in eutrophication and it is essential to explore the processes and mechanisms of P mobility in natural waters. In this study, laboratory experiments were conducted to simulate the SW system (sediment and water) and SAW system (sediment, algae and water) under four hydrodynamic intensity conditions (static control, 50 rpm, 125 rpm and 200 rpm treatments), to investigate P mobility. Results in SW system showed that, sediment was an important source of P for overlying water, and the released total P (TP) increased with stronger hydrodynamic intensity, when P associated with metal pools (redox-sensitive P [BD-P] and meta-oxides bound P [NaOH-P]) were the most unstable and easier to migrate into the overlying water. Stronger hydrodynamic disturbances could enhance the processes including sediment resuspension, dissolution of particles, and release of P, when P mobility had a close relationship with redox conditions near sediment-water interface (SWI). Therefore, the release of TP, BD-P and NaOH-P from sediment increased and decreased in the control and 50-200 rpm treatments over time. In SAW system, the release of TP signi cantly increased from sediment comparing to SW system, and the growth of Microcystis aeruginosa could selectively enhance the release of BD-P, NaOH-P, and organic P (OP). Meanwhile, the released P from sediment was quickly accumulated by algal cells. The maximum accumulation ability of P by cells, the highest photosynthetic e ciency and the best growth of M. aeruginosa were observed in 125 rpm treatment. But with excessively strong hydrodynamic intensity (200 rpm treatment), the accumulation ability of P and alkaline phosphatase activity (APA) of M. aeruginosa was suppressed, which might hinder algal utilization of P and inhibit algal growth. Overall, our ndings demonstrated the patterns of P mobility in natural ecosystems and could contribute to the understanding of P cycling.

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Section: Effects Of Cyanobacteria On P Mobilitymentioning

confidence: 52%

Section: Effects Of Hydrodynamic Conditions On Cyanobacteriamentioning

confidence: 69%

Processes and mechanisms of phosphorus mobility among sediment, water, and cyanobacteria under hydrodynamic conditions

Ren

Ding

et al. 2021

Environ Sci Pollut Res

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“…For example, higher dissolved inorganic P (DIP, mainly as phosphate) in water could enhance algal production of photosynthetic pigments and the antioxidase activity of UV-radiated M. aeruginosa, leading to a higher adaptation capability (Ren et al 2020). However, DIP shortage has become a common phenomenon in many systems and algae often produced alkaline phosphatase (APase) to hydrolyze dissolved organic P (DOP) for phosphate in the natural waters, which was an indirect process for algal P utilization (Ma et al 2019) and might result in different manners for the adaptation of cyanobacteria to UV radiation. Especially, regions at mid-low latitudes are more threatened by UV radiation (Morris et al 1995) and Microcystis often occur as surface blooms, which are assumed to be more negatively in uenced by UV radiation.…”

Section: Introductionmentioning

confidence: 99%

“…Since M. aeruginosa could not eliminate UV-induced effects through above-mentioned adaptation processes or sustain its normal growth with stored P in DOP-free medium, F v /F m of UV-radiated algae did not recover to the initial value and the worst UV adaption capability was observed.4.3. Roles of DOM on APase InactivationAlthough many studies have examined the kinetic and fate of APase under varying conditions(Ren et al 2015;Ma et al 2019); limited information was provided on the effects and regulation of irradiation and DOM, despite the complex light conditions and widespread presence of DOM in natural waters.It was reported that APase was stable in water and could remain active for several days, but HA occupying the main part of DOM pool could directly associate with APase(Boavida et al 1998;Sun et al 2014). Our study supported previous data and HA might block the active sites of APase, leading to APA decrease in the dark.…”

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confidence: 99%

Effects of Algal Utilization of Dissolved Organic Phosphorus by Microcystis Aeruginosa on its Adaptation Capability to Ambient Ultraviolet Radiation

Ren

Huang

Zhu

et al. 2021

Preprint

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Phosphorus (P) plays an important role in eutrophication and algal adaptation to environmental stresses; therefore, a better understanding of the impact of P is essential to control cyanobacterial bloom. In this study, Microcystis aeruginosa was treated with 5-h of ambient irradiation in the culture medium with different availability of dissolved organic P (DOP) and dissolved organic matter (DOM), to explore algal responses. Compared to photosynthetically active radiation (PAR), ambient UV-A and UV-B radiation exerted oxidative stresses and had inhibitive effects on the growth and photosynthesis of M. aeruginosa in DOP-rich medium. However, M. aeruginosa had a strong adaptation capability and the negative effects of UV radiation were eliminated with DOM addition (5 mg L− 1 humic acid [HA]). Combining dissolved inorganic P (DIP) and DOP contents in the culture medium, adaptation of M. aeruginosa to UV radiation in the DOP-rich waters could be mainly achieved through the hydrolysis of DOP and metabolism of DIP, and the DOP utilization behaviors of M. aeruginosa greatly affected its UV adaptation capability. In DOP-rich medium without DOM, APase inactivation after UV radiation negatively affected DOP utilization by M. aeruginosa, and algal P demand for UV adaptation could not be fully met. DOM could act as an antioxidant and greatly decreased APase inactivation after UV radiation, when M. aeruginosa utilized DOP faster to produce more DIP and to increase algal carotenoid, phycocyanin production and its superoxide dismutase (SOD) activity in the DOP-rich medium, resulting in a strong UV adaptation capability. Consequently, M. aeruginosa showed the lowest adaptation capability to UV radiation in the DOP-free medium. Overall, our findings indicated the close relationship of algal DOP utilization and its adaptation to ambient UV radiation of typical cyanobacteria in DIP-limited and DOP-enriched natural waters.

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“…Anthropogenic nutrient over-enrichment, coupled with rising temperatures and an increasing frequency of extreme hydrologic events are accelerating eutrophication and encouraging algal blooms. These consequently affect water supplies, fisheries, recreation, tourism, and property values (Paerl et al, 2011;Ma et al, 2019). The watershed nutrient management struggles to control algae blooms in huge quantities and cover the lake by reducing P inputs.…”

Section: Introductionmentioning

confidence: 99%

Contribution of spring and summer hydrodynamic conditions in the eutrophication process at Lake Taihu, China

Asmaa¹,

Li²,

Jin³

et al. 2020

J. Ecol. Nat. Environ.

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Contribution of different hydrodynamic conditions caused nutrients released and algal blooms growth and deteriorates water quality. Important factors related to climate variation, such as water temperature, precipitation, wind, solar radiation, and human activities can influence trophic conditions in the water column. A field survey was conducted at Meiliang Bay during spring and summer seasons and in diverse hydrodynamic conditions. The study aimed to investigate the variation of wave shear stress generated by strong wind and vessels. The measurement results showed that the shear stress increased in direction with increasing wind speed and significant wave heights. Wave shear stress τ has a maximum value = 0.2 Nm 2 during weak wind 1.5-2.5 m/s and significant wave height = 0.20 m while, it has a maximum value = 0.8 Nm 2 with strong wind range from 4.5 to 10 m/s corresponding with the significant wave height which has maximum value = 0.65 m in 2014. Also, wave shear stress τ has maximum value = 0.25 Nm 2 with maximum significant wave height = 0.6 m during passages vessels in 2016. It ranges from-0.8 to 0.8 Nm 2 with maximum wave amplitude value U = 0.4 m/s passages heavy ship in 2018. The results indicated that the bottom layer has a major impact, with strong winds and vessels' induced waves. Furthermore, the shear stress generated by those forces impacted directly on the boundary of the lake and caused sediment resuspension leading to release nitrogen. The outcomes of this paper give a clear idea about the processes happening in the lake.

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Using alkaline phosphatase activity as a supplemental index to optimize predicting algal blooms in phosphorus-deficient lakes: A case study of Lake Taihu, China

Cited by 33 publications

References 72 publications

Processes and mechanisms of phosphorus mobility among sediment, water, and cyanobacteria under hydrodynamic conditions

Processes and mechanisms of phosphorus mobility among sediment, water, and cyanobacteria under hydrodynamic conditions

Effects of Algal Utilization of Dissolved Organic Phosphorus by Microcystis Aeruginosa on its Adaptation Capability to Ambient Ultraviolet Radiation

Contribution of spring and summer hydrodynamic conditions in the eutrophication process at Lake Taihu, China

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