Short-term changes in algal blooms and phytoplankton community after the passage of Super Typhoon Lekima in a temperate and inner sea (Bohai Sea) in China

Jiang, Tao; Wu, Guannan; Niu, Pengli; Cui, Zhengguo; Bian, Xiaofeng; Xie, Yixuan; Shi, Honghua; Xu, Xiaotao; Qu, Kun

doi:10.1016/j.ecoenv.2022.113223

Cited by 32 publications

(9 citation statements)

References 47 publications

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“…The number of observation points at different layers in each characteristic month from 2016 to 2018 is shown in Table 1. The sampling locations in this study are all over the Bohai Sea, and the number of observation sites in each month is more than 300, far more than that in previous studies (Zhang et al, 2017;Pei et al, 2019;Xie et al, 2021;Jiang et al, 2022).…”

Section: Observation Datamentioning

confidence: 90%

“…Moreover, the total Chl-a in LZB and CBS are higher in 2018 than that in the previous two years, possibly due to typhoon "Wimbiya" which started on August 19th. After the typhoon, the concentration of dissolved inorganic nitrogen and dissolved inorganic silicon in the surface increased, which led to the increase of Chl-a concentration in the surface (Jiang et al, 2022). In October, the total Chl-a in BHB and LDB decreases significantly from 2016 to 2018, while its change in LZB and CBS is not obvious.…”

Section: Marine Ecological Environment Assessment In Four Sub-regions...mentioning

confidence: 99%

“…Human activities and strong sea-land interaction have important impacts on the marine ecosystem of the Bohai Sea. As an important indicator of water quality and ecosystem health, Chl-a has been studied extensively in the Bohai Sea (Zhang et al, 2016;Zhou et al, 2021;Jiang et al, 2022). At present, the data of Chl-a concentration are mainly obtained through satellite remote sensing, field observation and model simulation.…”

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confidence: 99%

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Temporal and spatial variation of chlorophyll a concentration and ecological environment assessment in Bohai Sea

Zhao

Xiao

Guo

et al. 2023

Preprint

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Chlorophyll-a (Chl-a) is an important indicator of phytoplankton bloom and water eutrophication, as well as a basic parameter to assess coastal ecosystem health. This study utilizes a significant amount of observational data regarding Chl-a concentration. The linear Radial Basis Function (RBF-Linear) is a fitting method used to reconstruct the in-situ observation data of Chl-a concentration in the Bohai Sea in August 2017, with two advantages of small comprehensive error and reasonable spatial distribution. This method is selected through 10-fold cross-validation, correlation analysis and spatial distribution comparison. This will provide a potential application prospect for evaluating satellite products and improving the accuracy of ecological models. Then we use this method to obtain the complete three-dimensional spatial field of Chl-a concentration in the Bohai Sea during March, May, August and October from 2016 to 2018. The spatial and temporal distribution of Chl-a concentration in the Bohai Sea shows obvious spatial and temporal distribution characteristics: spatially, the high Chl-a concentration is mainly distributed in coastal waters, especially near estuaries and mariculture area; Temporally, there are two obvious peaks in March and August. Additionally, two indicators of total Chl-a and area with high Chl-a concentration are given in order to assess the marine ecological environment in four sub-regions of the Bohai Sea (Bohai Bay, Liaodong Bay, Laizhou Bay, and Central Bohai Sea), with a focus on the impacts of special weather events and bottom water quality. Along with restoring the marine natural environment, attention should be given to balancing urban development.

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Section: Observation Datamentioning

confidence: 90%

Section: Marine Ecological Environment Assessment In Four Sub-regions...mentioning

confidence: 99%

mentioning

confidence: 99%

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Temporal and spatial variation of chlorophyll a concentration and ecological environment assessment in Bohai Sea

Zhao

Xiao

Guo

et al. 2023

Preprint

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“…For example, phytoplankton responses to increased nutrient supplies during TC periods are widely observed compared with non‐TC periods, despite TC passages in summer and autumn affecting phytoplankton dynamics differently (Ko et al., 2016, 2017; Zhao et al., 2008). After TCs, large amounts of dissolved nutrients frequently occur due to runoff and hydrological alteration, e.g., currents and upward mixing, are induced, which probably limit phytoplankton growth (Baleani et al., 2021; Havens et al., 2011; Jiang et al., 2022; Stockwell et al., 2020). Moreover, TCs show significant associations with gelatinous and carnivorous zooplankton at varying time intervals (López‐López et al., 2012), but an understanding of how they affect a planktonic food chain is lacking because of limited plankton indices derived from a single trophic level, e.g., focusing merely on phytoplankton or zooplankton (Chai et al., 2021; Ko et al., 2016; López‐López et al., 2012).…”

Section: Introductionmentioning

confidence: 99%

Tropical cyclone effects enhance limnetic plankton trophic‐level relationships in a subtropical oligotrophic freshwater ecosystem

dela Paz,

Lin,

Chang

et al. 2023

Freshwater Biology

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Tropical cyclones (TCs), as natural extreme weather events, alter plankton and hydrological environments, affecting the stability of biological processes in freshwater ecosystems, and such TC effects vary with water depths. Previous studies have found increased phytoplankton biomass resulting from TC effects has been observed, leading to potential strong grazing of zooplankton and enhanced plankton trophic‐level relationships. However, this remains understudied, particularly under in situ conditions. Using a zooplankton to phytoplankton (ZB/PB) ratio to represent the plankton trophic‐level relationship, we estimated the ZB/PB ratios at various depth intervals, including surface (2 m depth) and euphotic (depths between 0 and 20 m) depths and depth layer 0–50 m (depths between 0 and 50 m), in a subtropical deep oligotrophic freshwater ecosystem from 2012 to 2015 to understand how TC effects would influence changes in the ZB/PB ratio variations. TCs affected the surface and euphotic ZB/PB ratios but not those at the depth layer 0–50 m. The TC durations had an initially negative and then positive impact on the surface ZB/PB ratio, indicating that slow‐moving TCs might restructure surface plankton trophic‐level relationships. The water temperature and nutrient dynamics during the TC weeks showed the highest correlations with the ZB/PB ratios at the surface and euphotic depths. The combined environmental effects influenced the ZB/PB ratios at the surface and euphotic depths during the TC weeks, with 65.1% and 72.2% of the total variations explained in the multivariate regressions, respectively. There were greater impacts of TCs in shallow water (surface and euphotic depth) than in deep water. Aquatic food chains may be unexpectedly vulnerable to natural extreme weather events, such as TCs, and continuous assessments of food chain dynamics are necessary to better manage potential risks from natural extreme weather events in freshwater ecosystems.

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“…The natural disasters in the SCBHS mostly result from storm surges. The catastrophic storms in the Bohai Sea usually occur in summer and autumn, on an average frequency of once every 4 years, and smaller storms happen on the average frequency of 1-2 times a year, yet which have caused inestimable losses (Feng et al, 2018;Jiang et al, 2022). In particular, the coastal regions of the Bohai Bay and Laizhou Bay have undergone several severe storm disasters.…”

Section: Introductionmentioning

confidence: 99%

Coastal vulnerability modelling and social vulnerability assessment under anthropogenic impacts

et al. 2022

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Coastal regions are highly vulnerable to the impacts of human activities, land cover change, sea level rise (SLR), and climate extremes. In this study, we attempt to address this issue by simulating the spatial interactions among natural hazards, ever-increasing human activities, and social vulnerability in the south coast of the Bohai Sea, China. It is found that the activities occurring on land, especially within coastal environments, such as agricultural pond and ports, and those in the ocean (tide and residual current) both impose disaster risks on the marine environment. In 2020, 25.2% of the total study area is highly vulnerable, which is 21% larger than that in 1997. The socially vulnerable areas are mainly distributed in the southeast coast of the Laizhou Bay. These areas should be strengthened to reduce and prevent the storm surge and flood disasters. Ultimately, we emphasize the urgent needs to implement effective policy measures for reducing tomorrow’s risks from natural hazards.

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Short-term changes in algal blooms and phytoplankton community after the passage of Super Typhoon Lekima in a temperate and inner sea (Bohai Sea) in China

Cited by 32 publications

References 47 publications

Temporal and spatial variation of chlorophyll a concentration and ecological environment assessment in Bohai Sea

Temporal and spatial variation of chlorophyll a concentration and ecological environment assessment in Bohai Sea

Tropical cyclone effects enhance limnetic plankton trophic‐level relationships in a subtropical oligotrophic freshwater ecosystem

Coastal vulnerability modelling and social vulnerability assessment under anthropogenic impacts

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