Variations in light absorption properties during a phytoplankton bloom in the Pearl River estuary

Wang, Guifen; Cao, Wenxi; Yang, Ying; Zhou, Wen; Liu, Sheng; Yang, Donglei

doi:10.1016/j.csr.2010.02.010

Cited by 17 publications

(6 citation statements)

References 43 publications

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“…Hence, surface bacteria in upwelled and downwelled waters did not exhibit a difference in resistance to UVR in our study, although vertical mixing has been shown to influence the DNA damage and viability of bacteria (Jeffrey et al 1996, Hernández et al 2006, Bertoni et al 2011. The freshwater discharge is characterized by heavy organic loads in the Pearl River estuary, which influences its optical properties (Wang et al 2010). As a result, the UVA diffuse attenuation coefficient was high at Stn E001 and adjacent waters (Table 1).…”

Section: Factors Regulating Uvr Effectsmentioning

confidence: 81%

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Yuan¹,

Yin²,

Harrison³

et al. 2011

Aquat. Microb. Ecol.

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In late summer of 2005, the effects of ultraviolet radiation (UVR) on primary production (PP), bacterial production (BP) and viral decay rates (VDR) were investigated along a salinity gradient in the northern South China Sea. The freshwater input increased the UVA diffuse attenuation coefficient (up to 2.7 m −1 ) near the Pearl River estuary and consequently influenced the UVR inhibitory effects, as VDR was significantly correlated with the UVA diffuse attenuation coefficient. UVR inhibition of PP was significantly higher in upwelled waters than downwelled waters, suggesting that the vertical mixing (i.e. upwelling and downwelling) was an important factor regulating microbial sensitivity to UVR. UVR inhibited PP and BP by ~15 and 25%, respectively, and the UVR inhibition of BP was significantly higher than that of PP in most of the samples; hence there was a competitive advantage for phytoplankton over bacteria under the relatively high UVR exposure. UVR increased VDR by ~30%, which decreased bacterial mortality by 0.12 to 0.3% h −1 and mitigated the inhibitory effects of UVR on bacteria. In general, phytoplankton were more tolerant than bacteria and viruses to UVR in the sub-tropical northern South China Sea.

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Section: Factors Regulating Uvr Effectsmentioning

confidence: 81%

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Yuan¹,

Yin²,

Harrison³

et al. 2011

Aquat. Microb. Ecol.

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“…It can be seen that a p (λ) at Stations P1 and P3 were much higher than that at Station P2, which was accompanied by a greater diurnal variation. It is noted that the spectral absorption coefficient for total particles was nearly similar to that for non-algal particles, implying that the non-algal particles absorption could be the main contributor of a p (λ), which is different from that of open ocean water [44][45][46] and some eutrophic water [27], where the contribution of absorption by phytoplankton to the total particulate absorption is dominant. Figure 7.…”

Section: Spectral Slope Of Cdom Absorptionmentioning

confidence: 95%

“…The weight of the filter paper had been measured in the laboratory before the cruise, and the filter paper was dried under infrared light and stored for on-shore analysis [17]. After taking to the laboratory, the filter was dried at 40 • C for 48 h and re-weighted at room temperature [27].…”

Section: Measurement Of Suspended Particle Matter Concentrationmentioning

confidence: 99%

Diurnal Variation of Light Absorption in the Yellow River Estuary

et al. 2018

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Considering the influence of river discharge and strong winds, the diurnal variability of ocean optical absorption properties in the Yellow River Estuary (YRE) is quantified, using in-situ measurements. The study finds that terrestrial sources due to the Yellow River discharge can cause high diurnal variation of water absorption because of the movement of river plume in the YRE, but such an influence diminishes far away from the Yellow River plume. The diurnal variability of water absorption, affected by strong winds, is found to be strengthened with a rapid increase of particles and colored dissolved organic matter (CDOM) arising from re-suspended sediment induced by wave forcing. The diurnal variability of particle absorption is controlled by non-algal particle absorption in the YRE, and the ratio of non-algal particle absorption (a NAP ) and total particle absorption for most wavelengths is more than 0.56. The diurnal variation of spectral slope of non-algal particle absorption (S NAP ) is found to vary within a narrow range, although large variability in the a NAP spectrum is observed. The CDOM is correlated negatively with salinity, and such negative correlation becomes weaker with the decreasing influence of riverine input. The spectral slope of CDOM absorption (S g ) may reflect the formation and constituents of CDOM with weak relationship to its concentration, and its relationship with the absorption of CDOM at 440 nm may be associated with the source of CDOM. The value of S g , which is affected by re-suspended bottom sediment, is much lower than that derived from CDOM affected by Yellow River runoff. Disregarding the absorption of pure water, the diurnal variability of total water absorption stems principally from changes in non-algal particle matter rather than CDOM and Chl-a. By the observations of hourly GOCI (Geostationary Ocean Color Imager) data, the major diurnal variations of remote sensing reflectance at 680 nm are observed in near-coastal waters and the estuary of the Yellow River, which are mainly influenced by the flow discharge of Yellow River and strong winds. Finally, the seasonal differences of diurnal variations of water absorption caused by strong winds and river discharge are determined.

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“…Certain meteorological conditions are required for algal blooms to occur because they determine in‐channel physical and chemical conditions, the water and air temperatures, the light environment, and the nutrient supplies from catchments (Ouellet et al, 2014; Phlips et al, 2007; Schindler et al, 1996). For example, the spectral gradient of light in water is an important basis for the succession of algal competition, and river depth and transparency affect algal growth by affecting light distribution in water (Huisman & Weissing, 1999; Wang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Hydrological management strategies for the control of algal blooms in regulated lowland rivers

Yin

Jia

et al. 2021

Hydrological Processes

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Reservoirs of lowland floodplain rivers with eutrophic backgrounds cause variations in the hydrological and hydraulic conditions of estuaries and low‐dam reservoir areas, which can promote planktonic algae to proliferate and algal bloom outbreaks. Understanding the ecological effects of variations in hydrological and hydraulic processes in lowland rivers is important for algal bloom control. In this study, the middle and lower reaches of the Han River, China, a typical regulated lowland river with a eutrophic background, are selected. Based on the effect of hydrological and hydraulic variability on algal blooms, a hydrological management strategy for river algal bloom control is proposed. The results showed that (a) differences in river morphology and background nutrient levels cause significant differences in the critical threshold flow velocities for algal bloom outbreaks between natural river and low‐dam reservoir sections; there is no uniform threshold flow velocity for algal bloom control. (b) There are significant differences in the river hydrological/hydraulic conditions between years with and without algal blooms. The average river flow, water level and velocity in years with algal blooms are significantly lower than those in years without algal blooms. (c) For different river sections where algal blooms occur and to meet the threshold flow velocities, the joint operation of cascade reservoirs and diversion projects is an effective method to prevent and control algal blooms in regulated lowland rivers. This study is expected to deepen our understanding of the ecological significance of special hydrological processes and guide algal bloom management in regulated lowland rivers.

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Variations in light absorption properties during a phytoplankton bloom in the Pearl River estuary

Cited by 17 publications

References 43 publications

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Diurnal Variation of Light Absorption in the Yellow River Estuary

Hydrological management strategies for the control of algal blooms in regulated lowland rivers

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Variations in light absorption properties during a phytoplankton bloom in the Pearl River estuary

Cited by 17 publications

References 43 publications

Phytoplankton are more tolerant to UV than ­bacteria and viruses in the northern South China Sea

Phytoplankton are more tolerant to UV than ­bacteria and viruses in the northern South China Sea

Diurnal Variation of Light Absorption in the Yellow River Estuary

Hydrological management strategies for the control of algal blooms in regulated lowland rivers

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Product

Resources

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Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea