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

Park, Yunjung; Cha, Jaeho; Song, Bongkeun; Huang, Yih; Kim, Seo Young; Kim, Suhyun; Jo, Eunhye; Fortin, Samantha G.; An, Shuqing

doi:10.1007/s12601-020-0011-0

Cited by 8 publications

(2 citation statements)

References 54 publications

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“…These results coincide with the process of nitrogen cycling described by Huang and An [32], who reported the following results regarding benthic nitrogen cycling under both normoxic and hypoxic conditions in Jinhae Bay: among the nitrate reduction processes, dissimilatory nitrate reduction to ammonium is dominant in Jinhae Bay due to the sulfidic and richly organic sediments; in hypoxic environments, denitrification increases, and the sediment is a continuously available source of ammonium under both normoxic and hypoxic conditions. Based on measurements of the oxygen demand in the water column (WOD) driven by microbial activity in Jinhae Bay, a constant WOD was maintained, even in hypoxic environments [33], which is consistent with weak hypoxia that intermittently supplies oxygen to shallow water depths [32]. Ammonium, but not other nitrogen forms, is produced continuously in hypoxic environments and thus shows stronger relationships with the indices of hypoxia.…”

Section: Analysis Of Factors Influencing Hypoxiamentioning

confidence: 68%

“…Ammonium, but not other nitrogen forms, is produced continuously in hypoxic environments and thus shows stronger relationships with the indices of hypoxia. Park et al [33] also noted that the WOD increased with the increasing water temperature and found significant positive correlations between these factors in Jinhae Bay. These findings are consistent with the strong positive correlations of the bottom-water temperature with the hypoxic area and minimum DO concentration presented in Table 6.…”

Section: Analysis Of Factors Influencing Hypoxiamentioning

confidence: 89%

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Environmental Parameters Related to Hypoxia Development and Persistence in Jinhae Bay from 2011 to 2016 and Their Potential for Hypoxia Prediction

Shim,

Ye,

Kim

et al. 2023

JMSE

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Jinhae Bay, a semi-enclosed bay on the southern coast of Korea, is a major aquaculture area that forms a spawning ground and nursery for commercially important fishes. Since the late 1960s, industrial and domestic waste from adjacent cities and industrial complexes has been released into the region, resulting in chronic hypoxia and red tides. As a central site of environmental monitoring efforts for aquaculture and fisheries in southeastern Korea, Jinhae Bay was surveyed every 2 months usually, and every 2–3 weeks during the hypoxia season, with the seawater properties observed at approximately 31–34 stations. The maximum area and duration of hypoxia in Jinhae Bay occurred in 2016 (316 km2 and 26 weeks, respectively), with minima of area in 2013 (213 km2) and duration in 2011 (15 weeks). Correlation analyses of the seawater properties, weather parameters, and hypoxia indices showed that the hypoxic area was positively correlated with the surface-water temperature, air temperature, and rainfall; the minimum dissolved oxygen concentrations were negatively correlated with the air and water temperatures and bottom-water nutrient levels; and the water stability was negatively correlated with the surface-water salinity and positively correlated with both the surface- and bottom-water nitrate and silicate concentrations. These findings imply that the air temperature and precipitation may be important factors in the development and persistence of hypoxia in Jinhae Bay via the control of the stratification intensity and eutrophication of the water column. Therefore, we tested these parameters for their potential to predict hypoxia. Based on our results, we propose the following trends of hypoxia in Jinhae Bay: the initial hypoxia development generally depends on the criteria of an air temperature ≥ 19.5 °C for 1 week and total precipitation > 100 mm over 4 weeks, and it becomes more severe (≥50% coverage) under strong eutrophication, mainly due to organic matter discharge following heavy rainfall, based on the logarithmic correlation with the 4-week rainfall (R2 = 0.6). Therefore, the hypoxic area index can be predicted using its linear regression relationships with the 1-week air temperature and 4-week precipitation (R2 = 0.56). This study tested the prediction of the hypoxic area based on a simple calculation method and weather parameter criteria, and it demonstrated the potential of this method for precisely forecasting hypoxia in combination with biogeochemical models or other mathematical solutions to prevent massive fishery damage.

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Section: Analysis Of Factors Influencing Hypoxiamentioning

confidence: 68%

Section: Analysis Of Factors Influencing Hypoxiamentioning

confidence: 89%

Environmental Parameters Related to Hypoxia Development and Persistence in Jinhae Bay from 2011 to 2016 and Their Potential for Hypoxia Prediction

Shim,

Ye,

Kim

et al. 2023

JMSE

View full text Add to dashboard Cite

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Impact of environmental factors on diversity of fungi in sediments from the Shenzhen River Estuary

et al. 2023

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In this study, to explore the relationship between environmental factors and fungal diversity in the Shenzhen River ecosystem, multiple methods including chemical analysis, culture isolation, qPCR analysis of fungal ITS region and ITS-based Illumina next-generation-sequencing were integrated. A total of 115 isolates were finally isolated and could be classified into 23 genera. Top three abundant genera isolated were Meyerozyma (18 strains), Aspergillus (17 strains) and Penicillium (14 strains). Based on the Illumina sequencing approach, 829 OTUs were affiliated to seven phyla, 17 known classes, and 162 genera, indicating the Shenzhen estuary sediments are rich in fungal diversity. The major fungal genera were Meyerozyma, Trichoderma and Talaromyces. Environmental factors showed a gradient change in Shenzhen estuary, and fungal abundance was only significantly correlated with NH4+. Shannon index was significantly correlated with pH and IC (P < 0.05). Principal coordinate analysis based on OTU level grouped into three clusters among sampling sites along with the IC and pH gradient. Functional guilds analysis suggests most of the fungi in this studying area were almost all saprotrophs, suggesting a large number of saprophytic fungi may play a significant role in the organic matter decomposition and nutrient cycling process. In summary, this study will deepen our understanding of fungi community in Shenzhen River ecosystem and their distribution and potential function shaped by environmental factors.

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Using sulfide as nitrite oxidizing bacteria inhibitor for the successful coupling of partial nitrification-anammox and sulfur autotrophic denitrification in one reactor

Zhao,

Dong,

Chen

et al. 2023

Chemical Engineering Journal

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

Cited by 8 publications

References 54 publications

Environmental Parameters Related to Hypoxia Development and Persistence in Jinhae Bay from 2011 to 2016 and Their Potential for Hypoxia Prediction

Environmental Parameters Related to Hypoxia Development and Persistence in Jinhae Bay from 2011 to 2016 and Their Potential for Hypoxia Prediction

Impact of environmental factors on diversity of fungi in sediments from the Shenzhen River Estuary

Using sulfide as nitrite oxidizing bacteria inhibitor for the successful coupling of partial nitrification-anammox and sulfur autotrophic denitrification in one reactor

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