Ecological interruption on food web dynamics by eutrophic water discharge from the world’s longest dike at Saemangeum, Yellow Sea
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 th...
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| Format: | Article |
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Elsevier
2024-02-01
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| Series: | Environment International |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0160412024000540 |
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| author | In Ok Lee Hosang Kim Inha Kwon Bong-Oh Kwon Jae-Sung Kim Junghyun Lee Jungho Nam Junsung Noh Jong Seong Khim |
| author_facet | In Ok Lee Hosang Kim Inha Kwon Bong-Oh Kwon Jae-Sung Kim Junghyun Lee Jungho Nam Junsung Noh Jong Seong Khim |
| author_sort | In Ok Lee |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-07T23:39:10Z |
| format | Article |
| id | doaj.art-437c7eed362a4c049666974c6dcc4af4 |
| institution | Directory Open Access Journal |
| issn | 0160-4120 |
| language | English |
| last_indexed | 2024-03-07T23:39:10Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Environment International |
| spelling | doaj.art-437c7eed362a4c049666974c6dcc4af42024-02-20T04:18:25ZengElsevierEnvironment International0160-41202024-02-01184108468Ecological interruption on food web dynamics by eutrophic water discharge from the world’s longest dike at Saemangeum, Yellow SeaIn Ok Lee0Hosang Kim1Inha Kwon2Bong-Oh Kwon3Jae-Sung Kim4Junghyun Lee5Jungho Nam6Junsung Noh7Jong Seong Khim8School of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of KoreaSchool of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of KoreaSchool of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of KoreaDepartment of Marine Biotechnology, Kunsan National University, Kunsan 54150, Republic of KoreaWater and Eco-Bio Corporation, Jungboo Building, Kunsan 54150, Republic of KoreaDepartment of Environmental Education, Kongju National University, Gongju 32588, Republic of KoreaMarine Policy Research Division, Korea Maritime Institute, Busan 49111, Republic of KoreaDepartment of Environment & Energy, Sejong University, Seoul 05006, Republic of Korea; Corresponding authors at: Department of Environment & Energy, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea.School of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of Korea; Corresponding authors at: School of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of KoreaThe 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.http://www.sciencedirect.com/science/article/pii/S0160412024000540Food web dynamicsMicrophytobenthosOrganic mattersBenthosSea dikeEutrophication |
| spellingShingle | In Ok Lee Hosang Kim Inha Kwon Bong-Oh Kwon Jae-Sung Kim Junghyun Lee Jungho Nam Junsung Noh Jong Seong Khim Ecological interruption on food web dynamics by eutrophic water discharge from the world’s longest dike at Saemangeum, Yellow Sea Environment International Food web dynamics Microphytobenthos Organic matters Benthos Sea dike Eutrophication |
| title | Ecological interruption on food web dynamics by eutrophic water discharge from the world’s longest dike at Saemangeum, Yellow Sea |
| title_full | Ecological interruption on food web dynamics by eutrophic water discharge from the world’s longest dike at Saemangeum, Yellow Sea |
| title_fullStr | Ecological interruption on food web dynamics by eutrophic water discharge from the world’s longest dike at Saemangeum, Yellow Sea |
| title_full_unstemmed | Ecological interruption on food web dynamics by eutrophic water discharge from the world’s longest dike at Saemangeum, Yellow Sea |
| title_short | Ecological interruption on food web dynamics by eutrophic water discharge from the world’s longest dike at Saemangeum, Yellow Sea |
| title_sort | ecological interruption on food web dynamics by eutrophic water discharge from the world s longest dike at saemangeum yellow sea |
| topic | Food web dynamics Microphytobenthos Organic matters Benthos Sea dike Eutrophication |
| url | http://www.sciencedirect.com/science/article/pii/S0160412024000540 |
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