Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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A Preliminary Study of the Effect of Pelagic Organisms on the Macrobenthic Community in the Adjacent East China Sea and Korea Strait

표영생물이 동중국해 주변 해역과 대한해협의 대형저서동물 군집에 미치는 영향 파악을 위한 선행 연구

  • 유옥환 (한국해양연구원 해양생물자원연구부) ;
  • 백상규 (한국해양연구원 해양생물자원연구부) ;
  • 이형곤 (한국해양연구원 해양생물자원연구부) ;
  • 강창근 (부산대학교 생명과학부) ;
  • 김동성 (한국해양연구원 해양생물자원연구부) ;
  • 이재학 (한국해양연구원 해양생물자원연구부) ;
  • 김웅서 (한국해양연구원 여수엑스포 지원TFT)
  • Published : 2008.09.30
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Abstract

Despite the impacts of the climate changes on the pelagic ecosystem, few studies have examined the pelagic-benthic coupling in the adjacent East China Sea and Korea Strait. Therefore, the species composition and abundance of the macrobenthic community, as well as the potential food sources of benthic fauna were investigated in the present study using stable isotope analysis (${\delta}^{13}C\;and\;{\delta}^{15}N$) for suspended particulate organic matter (SPOM), sedimentary organic matter (SOM), phytoplankton, and zooplankton. A total of 157 macrobenthic fauna were collected, and the density of the macrobenthic fauna ranged from 4 to 434 ind./0.25 $m^2$, with an average density of 149 ind./0.25 $m^2$. The density of the benthic fauna increased moving from offshore shelf sites to coastal sites adjacent to the Korea Strait. Cluster analysis showed that the macrobenthic communities consisted of three distinct groups: group A in the Korea Strait, group B in the East China Sea, and group C near Ieodo. The dominant species in group A were the amphipods Photis japonica and Ampelisca miharaensis, followed by the polychaete Scolotoma longifolia. Environmental variables, such as the temperature of the seawater and sediment, and oxygen, and chlorophyll a levels, appeared to affect the structure of the community, suggesting the importance of coupling with the pelagic system. The ${\delta}^{13}C$ values of SPOM and zooplankton ranged from -22.97 to -23.5% and -19.92 to -21.86%, respectively, showing a relatively narrow range(<1%) between the two components. The difference between the ${\delta}^{13}C$ values of SOM and pelagic organic matter was also within 1%, suggesting that the SOM originated from the pelagic system, which is an important factor controlling the macrobenthic community.

Keywords

References

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