가막만의 빈산소 퇴적층 형성과 저서성 유공충 군집변화 연구
The Formation of Hypoxia Sediment and Benthic Foraminiferal Change in Gamak Bay, Southern Coast of Korea
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초록
In order to understand the relationship between the formation of hypoxia sediment by eutrophication and changes in benthic foraminiferal assemblage, micropaleontological and geochemical analyses were carried out on one sediment box core (K-1) recovered in the northern Gamak Bay, which is one of the aquacultural areas in the South Sea of Korea. In this analysis, the PON content in the sediment rapidly increased, while the C/N ratio and the C/S ratio decreased since 1977. These results indicate that eutrophication commenced in 1977 in the northern Gamak Bay, and consequently, the hypoxia sediment is 20 cm thick. Ammonia beccarii-Buccella frigida assemblage occurs before the formation of hypoxia sediment. Trochammina hadai-Buccella frigida assemblage appeared in the transitional period toward hypoxia and Trochammina hadai assemblage with a low abundance and diversity is observed in the hypoxia sediment. The agglutinated species T. hadai is regarded as a bio-indicator (opportunistic species) of the organic pollution in northern Gamak Bay.
Abstract
In order to understand the relationship between the formation of hypoxia sediment by eutrophication and changes in benthic foraminiferal assemblage, micropaleontological and geochemical analyses were carried out on one sediment box core (K-1) recovered in the northern Gamak Bay, which is one of the aquacultural areas in the South Sea of Korea. In this analysis, the PON content in the sediment rapidly increased, while the C/N ratio and the C/S ratio decreased since 1977. These results indicate that eutrophication commenced in 1977 in the northern Gamak Bay, and consequently, the hypoxia sediment is 20 cm thick. Ammonia beccarii-Buccella frigida assemblage occurs before the formation of hypoxia sediment. Trochammina hadai-Buccella frigida assemblage appeared in the transitional period toward hypoxia and Trochammina hadai assemblage with a low abundance and diversity is observed in the hypoxia sediment. The agglutinated species T. hadai is regarded as a bio-indicator (opportunistic species) of the organic pollution in northern Gamak Bay.
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