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KMID : 1024520200290111125
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Journal of the Environmental Sciences
2020 Volume.29 No. 11 p.1125 ~ p.1139
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Standing Stocks and Spatial Distribution of Meiofauna on Deep-sea Sediment in an Environmental Impact Experiment of a Candidate Site
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Min Won-Gi
Rho Hyun-Soo
Kim Dong-Sung
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Abstract
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This study investigated the distributional pattern of meiobenthos associated with future deep-sea mining in the Korea Deep Ocean Study area present in the Clarion-Clipperton Fracture Zone (CCFZ) located in the southeastern part of the North Pacific Ocean. Standing stocks of meiobenthos were investigated in benthic impact experiment sites (BIS) and Korea Institute of Ocean Science & Technology long-term monitoring (KOMO) sites during the 2008-2014 annual field survey. A total of 14 taxa of meiobenthos were identified. Nematodes were the most abundant taxon (60-86%). Harpacticoid copepods (5-26%) and benthic foraminifera (1-12%) were also dominant at all sites. The total meiobenthic densities varied from 4 to 150 ind./10 cm2. The mean value of total meiobenthic abundance was higher at BIS than at KOMO sites, but there was no significant difference between the two sites. The mean values of the number of taxa and biomass at BIS and KOMO sites were similar. The mean abundance of nematodes that were the most dominant taxa was also higher at BIS than at KOMO sites. The standing stocks in our study sites were relatively lower than those previously reported at other CCFZ sites. These results seem to reflect a low organic concentration in the study area.
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KEYWORD
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Meiobenthos, Standing stocks, Clarion-Clipperton fracture zone, Korea Deep Ocean Study (KODOS) area, Northeast Pacific
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