Dynamics of the Physical and Biogeochemical Processes during Hypoxia in Jinhae Bay, South Korea

Lee, Ji-Young; Kim, Soo-gon; An, Shuqing

doi:10.2112/jcoastres-d-16-00122.1

Cited by 15 publications

(4 citation statements)

References 34 publications

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“…The strong stratification of the water column from July to September was associated with hypoxia ( Fig. 3), indicating that stratification is a necessary condition for the development of hypoxia in JB [Lee et al, 2017].…”

Section: Discussionmentioning

confidence: 99%

“…1), dominated by semidiurnal tides with a mean tidal range of 203 cm [Lee et al, 2017]. JB is semienclosed by lands and many islands and is connected only via the narrow straits of Gadeok and Gyeonnaeryang at a low water exchange rate [Kim et al, 2016].…”

Section: Hydrographic and Microbial Data Setsmentioning

confidence: 99%

“…As a result, JB has had anthropogenically derived environmental problems, such as chronic hypoxia, water quality deterioration, and harmful algal blooms [Lim et al, 2006;Lee et al, 2013;Kim et al, 2014Kim et al, , 2015. Seasonal hypoxia has developed in bottom waters of JB since the 1970s because of a combination of eutrophication-derived algal blooming (spring) and density stratification (summer) [Cho, 1979;Lee et al, 2017Lee et al, , 2018.…”

Section: Introductionmentioning

confidence: 99%

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Temporal and Vertical Variation in Microbial Community Composition in Response to Physicochemical Characteristics in a Water Column of Highly Eutrophied Jinhae Bay, South Korea

et al. 2018

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Microbial communities play an essential role in marine biogeochemical cycles. Physical and biogeochemical changes in Jinhae Bay, the most anthropogenically eutrophied bay on the coasts of South Korea, are well described, but less is known about the associated changes in microbial communities. Temporal and vertical variation in microbial communities at three depths (surface, middle, and bottom) at seven time points (June to December) at the J1 sampling site were investigated on the MiSeq platform based on the 16S rRNA gene. Overall, the microbial community was dominated by Proteobacteria, Cyanobacteria, and Bacteroidetes from June to November, whereas Firmicutes were dominant in December, especially in the middle and bottom layers. The results indicate that the microbial community composition strongly varied with temporal changes in the physicochemical water properties. Moreover, the community composition differed markedly between the surface and middle layers and the bottom layer in the summer, when the water column was strongly stratified and bottom water hypoxia developed. A redundancy analysis suggested a significant correlation between physicochemical variables (i.e., temperature, salinity, and oxygen concentration) and microbial community composition. This study indicates that temporal changes in water conditions and eutrophication-induced hypoxia effectively shape the structure of the microbial community.

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Section: Discussionmentioning

confidence: 99%

Section: Hydrographic and Microbial Data Setsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal and Vertical Variation in Microbial Community Composition in Response to Physicochemical Characteristics in a Water Column of Highly Eutrophied Jinhae Bay, South Korea

et al. 2018

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“…Since the 1970s, intensive anthropogenic activities in this area have discharged domestic sewage and land-use wastes (3,800 and 3,600 kg d −1 , respectively) into several inflowing streams (Lee et al, 2018), loading them with massive nutrient contents (Lee and Min, 1990). These characteristics have resulted in serious environmental problems, such as eutrophication, hypoxia, and harmful algal blooms (red tides), leading to significant changes in coastal biogeochemical cycles and ecosystem structures (Lee and Lim, 2006;Moon et al, 2008;Kim D. et al, 2012;Lee et al, 2017;Lim et al, 2018). Hence, coastal ecosystem conservation in this area has become an important socioeconomic and scientific issue, and there have been many calls for a coastal ecosystem monitoring and effective water quality management systems.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Satellite-Based Chlorophyll-a Algorithms in Eutrophic Korean Coastal Waters: Jinhae Bay Case Study

et al. 2019

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Jinhae Bay, one of the most important aquaculture areas in Korean coastal waters, has suffered from serious environmental problems due to intensive anthropogenic activities since the 1970s. Determining the response of coastal ecosystems in Korea to anthropogenic activities requires understanding the characteristics of chlorophyll-a concentration (Chl-a), and the high spatiotemporal resolution of the Geostationary Ocean Color Imager (GOCI) can aid these efforts. However, producing reliable satellite-based Chl-a estimates is challenging in optically complex coastal waters and the Chl-a estimation algorithms must be assessed regionally. Based on in situ Chl-a measurements collected in Jinhae Bay between 2011 and 2016, we evaluated GOCI-derived Chl-a estimates obtained using six ocean color Chl-a algorithms: two standard open ocean algorithms, one GOCI-standard algorithm, and three Tassan's algorithms regionally modified for Korean waters. All of the algorithms tended to underestimate high Chl-a values >0.9 mg m −3. The Yellow Sea Large Marine Ecosystem Ocean Color Project (YOC) algorithm, one of the modified Tassan's algorithms, provided the best fit to the in situ Chl-a measurements in Jinhae Bay (r = 0.51, p < 0.05), including appropriate representations of the spatial and temporal variation. Therefore, this algorithm can be considered a baseline approach for satellite-based long-term coastal monitoring systems in Jinhae Bay.

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Total Microbial Activity and Sulfur Cycling Microbe Changes in Response to the Development of Hypoxia in a Shallow Estuary

et al. 2020

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Dynamics of the Physical and Biogeochemical Processes during Hypoxia in Jinhae Bay, South Korea

Cited by 15 publications

References 34 publications

Temporal and Vertical Variation in Microbial Community Composition in Response to Physicochemical Characteristics in a Water Column of Highly Eutrophied Jinhae Bay, South Korea

Temporal and Vertical Variation in Microbial Community Composition in Response to Physicochemical Characteristics in a Water Column of Highly Eutrophied Jinhae Bay, South Korea

Assessment of Satellite-Based Chlorophyll-a Algorithms in Eutrophic Korean Coastal Waters: Jinhae Bay Case Study

Total Microbial Activity and Sulfur Cycling Microbe Changes in Response to the Development of Hypoxia in a Shallow Estuary

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