한빛사논문
In Ok Lee a, Hosang Kim a, Inha Kwon a, Bong-Oh Kwon b, Jae-Sung Kim c, Junghyun Lee d, Jungho Nam e, Junsung Noh f, Jong Seong Khim a
aSchool of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of Korea
bDepartment of Marine Biotechnology, Kunsan National University, Kunsan 54150, Republic of Korea
cWater and Eco-Bio Corporation, Jungboo Building, Kunsan 54150, Republic of Korea
dDepartment of Environmental Education, Kongju National University, Gongju 32588, Republic of Korea
eMarine Policy Research Division, Korea Maritime Institute, Busan 49111, Republic of Korea
fDepartment of Environment & Energy, Sejong University, Seoul 05006, Republic of Korea
Corresponding authors : Junsung Noh, Jong Seong Khim
Abstract
The man-made sea dike has disrupted the natural link between riverine and marine ecosystems and caused eutrophication within the aquatic ecosystem. The eutrophic water discharge has also raised concerns. As a representative tidal flat with the longest dike in the world, Saemangeum has experienced the problem of eutrophication. To elucidate the discharge water effects on the benthic food web dynamics, a four-year round sampling was conducted in/outside of the Saemangeum sea dike. Stable isotope analysis was applied to benthos (a total of 54 species) and their potential diets. Water discharge tripled in period II (2021–2022) compared to the period I (2019–2020). However, there were no significant impact changes in food web structure between the two periods due to improved lake water quality in period II. A positive correlation of nutrient concentration between the inner and outer areas of the dike revealed a direct effect of the water discharge on the outer tidal flat. The water discharge altered the spatial environmental conditions and the food web structure of the outer tidal flat. High TN concentrations stimulated the biomass of microphytobenthos (MPB) near the water gates, which in turn increased MPB consumption by benthos, demonstrating the in/direct impacts of water discharge on the food web. Furthermore, filter feeders exhibited a more sensitive response to spatial organic matter distribution compared to deposit feeders in diet utilization. Overall, our novel findings on food web dynamics in a representative tidal flat with artificial structures emphasize the necessity of continuous monitoring to ensure the sustainability of coastal ecosystems.
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