Researches on regulatory mechanism of algal bloom size structure in eutrophic estuarine water

Zhang Yafeng; Hou Minchi; Chen Rong; Wang Kuo; Lei Yue; Wang Xutao; Yin Kedong

doi:10.12284/hyxb2022142

Volume 44 Issue 8

Aug. 2022

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Zhang Yafeng，Hou Minchi，Chen Rong, et al. Researches on regulatory mechanism of algal bloom size structure in eutrophic estuarine water[J]. Haiyang Xuebao，2022, 44(8)：142–150 doi: 10.12284/hyxb2022142

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Researches on regulatory mechanism of algal bloom size structure in eutrophic estuarine water

doi: 10.12284/hyxb2022142

Zhang Yafeng^{1, 2
,},
Hou Minchi²,
Chen Rong¹,
Wang Kuo¹,
Lei Yue¹,
Wang Xutao^{1, 2
,
,},
Yin Kedong^{1
,
,}

1.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)/School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China
2.
Eco-Environmental Monitoring and Research Center, Pearl River Valley and South China Sea Ecology and Environment Administration, Ministry of Ecology and Environment, Guangzhou 510611, China

Received Date: 2021-11-15
Rev Recd Date: 2022-03-08

Available Online: 2022-08-15

Publish Date: 2022-08-15

Abstract

Abstract

In order to examine the regulatory mechanism of size structure of algal blooms in eutrophic estuarine waters, we used river water, sea water and their mixed water in Zhujiang River Estuary during dry season and conducted incubation experiments to examine changes of nutrients and chlorophyll a (Chl a) concentrations. Algal growth rate (μ) and microzooplankton grazing rate (m) were estimated by dilution experiments to examine the effects of bottom-up (nutrients stimulation) and top-down control (microzooplankton grazing) on size structure of algal blooms. We found that nutrient additions increased the peak of Chl a concentration, and phytoplankton community dominance changed from picophytoplankton and nanophytoplankton to microphytoplankton. Generally, μ kept high in the first 2 to 3 days and then declined (1.13±0.37) per day in nutrient added river water; μ kept increasing (1.06±0.16) per day in nutrient added sea water and slightly fluctuated (0.58±0.14) per day in nutrient added mixed water with microphytoplankton having the highest μ. In contrast, m increased in the first 2 days or 3 days and then decreased, and there were no size differences in all treatments. The microzooplankton grazing vs algal growth (m/μ) increased from microphytoplankton, nanophytoplankton, to picophytoplankton, indicating that larger size phytoplankton were under less top-down control. In addition, m/μ increased as daily algal specific growth rate decreased, indicating that bottom-up control played a stimulating role at early stage, and the top-down control played a more important role in the late stage of algal blooms. This study suggests that eutrophication can make a difference in both the magnitudes and size structure of algal blooms in estuarine waters.
- algal blooms,
- size structure,
- bottom-up control,
- top-down control,
- eutrophic estuary

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References(38)

References

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