Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Responses of Benthic Animals in Spatial Distribution to the Sedimentary Environments on the Deep-sea Floor, the Clarion-Clipperton Fracture Zone, Northeastern Pacific Ocean

북동 태평양 심해저 C-C 해역의 퇴적 환경과 대형저서동물 분포와의 관계

  • Park, Heung-Sik (Marine Living Resources Research Division, KORDI) ;
  • Chi, Sang-Bum (Marine Geoenvironment and Resources Research Division, KORDI) ;
  • Paik, Sang-Kyu (Marine Living Resources Research Division, KORDI) ;
  • Kim, Woong-Seo (Marine Geoenvironment and Resources Research Division, KORDI)
  • 박흥식 (한국해양연구원 해양생물자원연구본부) ;
  • 지상범 (한국해양연구원 해저환경.자원연구본부) ;
  • 백상규 (한국해양연구원 해양생물자원연구본부) ;
  • 김웅서 (한국해양연구원 해저환경.자원연구본부)
  • Received : 2004.04.28
  • Accepted : 2004.06.08
  • Published : 2004.06.30
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Abstract

Relationships between sedimentary environments and abundance of benthic animals were examined on the deep-sea floor, the Clarion-Clipperton Fracture Zone, in the northeast equatorial Pacific Ocean. Specimens were collected using a box corer at 8 stations by sieving through 0.3 mm mesh screen. Sediments showed finer grain size ranged from 5.63 to $7.97{\varphi}$, 83.1% of mean porosity, 1.81 kPa of mean shear strength and organic carbon content in sediment ranged from 0.97 to $1.87\;mg/cm^3$. Manganese nodules covered on the bottom layer from 4 to 57% of coverages. A total of 26 faunal groups in 6 phyla was sampled and comprised 1,467 individuals. Mean biomass were calibrated to 0.5 gWWt/$0.06\;m^2$. Small-sized animals including foraminiferans and nematods were dominated among the faunal group which comprised 49.1% (892 ind.) and 11.5% (320 ind.), respectively. In SPI-analysis, vertical bio-disturbance marks were not observed except to Beggiatoa-type bacterial mats. As the results of relationship between environments and benthos, abundance of benthic animals, especially nematode, showed only a negative correlation to the coverage of nodules, and any other sedimentary factors analyzed in this study were rarely affected to the spatial distribution of benthic animals.

Keywords

Acknowledgement

Grant : 2003 심해저 광물자원 개발

Supported by : 해양수산부

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