Seasonal variability of estuarine dynamics due to freshwater discharge and its influence on biological productivity in Yeongsan River Estuary, Korea

Kim, Yong Hoon; Hong, Seongjin; Song, Yulong; Lee, Hyojin; Kim, Hae-Cheol; Ryu, Jongseong; Park, Jinsoon; Kwon, Bong-Oh; Lee, Changhee; Khim, Jong Seong

doi:10.1016/j.chemosphere.2017.04.085

Cited by 22 publications

(18 citation statements)

References 15 publications

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“…The constructed dike in the YRE has led to an increase in tidal range from 2.5 to 2.8 m, a decrease in tidal current from 80 to 15 cm s −1 (Kang 1999), and an increased rate of deposition of organic matter and silty clay sediments near the dike in the inner part of the estuary (Park 1987). In addition, tidal flats measuring about 280 km 2 have disappeared since the construction of dike (Kim et al 2017b).…”

Section: Description Of Study Areasmentioning

confidence: 99%

“…The environmental and biological conditions in the SRE are characterized by three main salinity gradients: oligohaline, mesohaline, and polyhaline (Kwon et al 2001;Park et al 2015b). It is noted that both the YRE and SRE watersheds are influenced by loading of nutrients and organic compounds from agricultural and industrial land uses (Kwon et al 2002;Kim et al 2017b).…”

Section: Description Of Study Areasmentioning

confidence: 99%

“…The loss and fragmentation of diverse intertidal habitats caused by hydrological changes resulting from the construction of dikes or dams may lead to severe modification of carbon/energy flow and food web structure in estuarine systems (Talley 2000;Wissel and Fry 2005;Park et al 2017). In the YRE, the estuarine dikes have seriously modified coastal wetlands and greatly reduced habitats (by about 280 km 2 ) of bare intertidal flats and saltmarsh plant communities (Kim et al 2017b). Therefore, the construction of the dike in the YRE might result in reduced biomass of benthic primary producers (e.g., benthic microalgae, macroalgae, and saltmarsh plants) from habitat loss, leading to a reduction of food availability for macrobenthic consumers (Park et al 2017).…”

Section: Spatial and Seasonal Variability In Food Web Structure In The Diked And Natural Systemsmentioning

confidence: 99%

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Trophic Structures of Two Contrasting Estuarine Ecosystems With and without a Dike on the Temperate Coast of Korea as Determined by Stable Isotopes

Park

Kwak

Lee

et al. 2019

Estuaries and Coasts

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To evaluate the modification of carbon flow in estuarine systems by a dike construction, we compared the trophic structures of the macrobenthic food webs in two contrasting estuaries, one with and one without a dike, on the western and southern coasts of Korea, by measuring the δ 13 C and δ 15 N values of subtidal macrobenthic consumers. The isotopic values of most organic matter sources were similar between the two estuaries, but there was a different pattern in the isotopic spatial variability between them. For the consumer δ 13 C values in the diked estuary, there were no significant spatial differences among sites and the isotopic niche widths were much narrower than those in the dike-free estuary. Moreover, the indices of community-wide metrics were smaller in the diked estuary than in the dike-free estuary. These results suggest a lower trophic diversity of macrobenthic consumers with their increased trophic redundancy in the diked estuary. These differences between the dike and dike-free estuaries might be explained by the decrease of benthic producers and then their lower food availabilities for consumers resulting from the presence of the dike. Our findings provide evidence that dike construction and subsequent alteration of hydrologic and circulation processes may lead to modification of the trophic structure of estuarine macrobenthic communities.

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Section: Description Of Study Areasmentioning

confidence: 99%

Section: Description Of Study Areasmentioning

confidence: 99%

Section: Spatial and Seasonal Variability In Food Web Structure In The Diked And Natural Systemsmentioning

confidence: 99%

See 1 more Smart Citation

Trophic Structures of Two Contrasting Estuarine Ecosystems With and without a Dike on the Temperate Coast of Korea as Determined by Stable Isotopes

Park

Kwak

Lee

et al. 2019

Estuaries and Coasts

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“…Estuaries can be defined as semi-enclosed bodies of water in which incoming saline ocean water is diluted by freshwater [1]. Estuaries hold ecological, recreational and economic value given their free connection to the open sea and they are rich in biological and ecological resources [2,3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Oil Spill Transport in Tide-Dominated Estuaries: A Case Study of Humber Estuary, UK

Eke

Anifowose

Wiel

et al. 2021

JMSE

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Oil spills in estuaries are less studied and less understood than their oceanic counterparts. To address this gap, we present a detailed analysis of estuarine oil spill transport. We develop and analyse a range of simulations for the Humber Estuary, using a coupled hydrodynamic and oil spill model. The models were driven by river discharge at the river boundaries and tidal height data at the offshore boundary. Satisfactory model performance was obtained for both model calibration and validation. Some novel findings were made: (a) there is a statistically significant (p < 0.05) difference in the influence of hydrodynamic conditions (tidal range, stage and river discharge) on oil slick transport; and (b) because of seasonal variation in river discharge, winter slicks released at high water did not exhibit any upstream displacement over repeated tidal cycles, while summer slicks travelled upstream into the estuary over repeated tidal cycles. The implications of these findings for operational oil spill response are: (i) the need to take cognisance of time of oil release within a tidal cycle; and (ii) the need to understand how the interaction of river discharge and tidal range influences oil slick dynamics, as this will aid responders in assessing the likely oil trajectories.

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“…In estuaries, salinity shows a broad range of spatial and temporal variations corresponding to estuarine morphology, tides, wind, precipitation, and freshwater inflow from upstream rivers. Freshwater inflow is influenced by both climate (i.e., precipitation in the catchment) and human interventions, such as dams, to secure freshwater resources (Kim et al, 2017). The number of dams has increased globally since the 1960s (Lehner et al, 2011), resulting in a growing anthropogenic pressure on rivers and estuaries; river inflow is controlled by dam operations in most regulated estuaries (Crook et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Effects of regulated dam discharge on plants and migratory waterfowl are mediated by salinity changes in estuaries

Kim

2020

Internat Rev Hydrobiol

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The rapid increase in dam construction has resulted in a worldwide loss of natural river flows. Regulated dam discharge into estuaries can interrupt the spatiotemporal occurrence of brackish communities adapted to optimal salinity ranges, further threatening biodiversity and ecosystem function in the affected regions. We used annual survey records from the Nakdong River Estuary from 2009 to 2018 to identify the indirect effect of regulated dam discharge on plants and migratory waterfowl. Increased mean salinity during the spring season negatively influenced the area covered by plants and the number of days on which swans were present during winter. Moreover, the mean salinity during the early growing periods of plants providing food to waterfowl was regulated by the amount of freshwater discharge from the estuarine barrage rather than by the direct effect of precipitation. Conservation managers should consider the amount of dam discharge and the salinity conditions during spring to maintain sufficient food resources and supporting functions for migratory waterfowl in the estuary. Our study highlights the need for a comprehensive assessment of time‐lag effects to minimize the negative impacts resulting from regulated dam discharge.

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Seasonal variability of estuarine dynamics due to freshwater discharge and its influence on biological productivity in Yeongsan River Estuary, Korea

Cited by 22 publications

References 15 publications

Trophic Structures of Two Contrasting Estuarine Ecosystems With and without a Dike on the Temperate Coast of Korea as Determined by Stable Isotopes

Trophic Structures of Two Contrasting Estuarine Ecosystems With and without a Dike on the Temperate Coast of Korea as Determined by Stable Isotopes

Numerical Modelling of Oil Spill Transport in Tide-Dominated Estuaries: A Case Study of Humber Estuary, UK

Effects of regulated dam discharge on plants and migratory waterfowl are mediated by salinity changes in estuaries

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