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RISS 인기검색어
- 검색키워드
- 저자 : Sho Nakano (검색결과 1 건)
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Sho Nakano Kyung Hee University 대학원 2015 국내석사
The Saemangeum dyke construction created huge brackish reservoir having strong eutrophication impacts from the two rivers (Mangyung and Dongjin River) as well as limited seawater inputs from the open sea through the sluice gates of the dyke simultaneously. The Saemangeum coast provides chances to study the relation of aquatic ecosystem and environmental changes in coastal area particularly the impacts of eutrophication and salinity changes In the present study, dynamics of zooplankton community, of which composition and distribution shows significant responding to environmental changes sensitively was analyzed in accordance with environmental changes. The distribution of zooplankton community with special emphasis on copepods community which is dominant species in Saemangeum coast, and the relationship with environmental factors were analyzed by Canonical Correspondence Analysis (CCA) and Generalized liner model (GLM). Further, the food web analysis using staple isotope ratios (δ13C and δ15N) was carried out for quantitative estimation of the ecosystem structure and function of Saemangeum coast. Dual δ13C and δ15N composition indicate the origin of organic matter and nutrients flows (i.e. distribution of food sources and pollutants) and trophic relation. The sample collection including particulate organic matter (POM), zooplankton, fish and sediment for food web analysis were conducted in each season (July, October 2013, February, April, August, October 2014 and February 2015) at 17 sites in the Saemangeum coast including two river water input points with water quality monitoring. As results, the brackish and coastal copepod species, Acartia spp., Oithona spp. and Paracalanus spp. appeared as dominant species during the study period and their distribution pattern showed strong seasonality. Especially, frequent appearance and high density of Oithona spp. which prefer the eutrophic environment can suggest eutrophication is progressing in Saemangeum coast. In addition, the results of CCA analysis suggested that copepod species responded to salinity, COD and water temperature significantly. As a result of food web analysis, the isotope ratios indicated complicated food web structure of the Saemangeum coast during survey period. Especially, the δ13C signals of POM showed bifacial patterns of environmental changes, desalination by freshwater accumulation in summer season and restoration of original oceanic status in winter season. Zooplankton and fish communities showed seasonally different distribution patterns and consequently different food web structure considering the feeding patterns according to environmental changes. Therefore, it can be suggested that desalination and eutrophication are main environmental factors determining the species composition and distribution patterns of zooplankton and fish communities.
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