Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Macrozoobenthic Communities of the Deep Sea Sediments in the Northeastern Pacific Ocean

북동태평양 심해저 퇴적물에 서식하는 대형저서동물의 군집

  • 최진우 (한국해양연구원 남해특성연구본부) ;
  • 김동성 (한국해양연구원 해양생물자원연구본부) ;
  • 현정호 (한국해양연구원 해양생물자원연구본부) ;
  • 이창훈 (한국해양연구원 남해특성연구본부)
  • Received : 2004.04.03
  • Accepted : 2004.05.15
  • Published : 2004.06.30
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Abstract

Macrobenthos were collected at 7 stations located from $5^{\circ}N$ to $10^{\circ}N$ with 1o interval along the longitude of $131^{\circ}W$ using a box corer with sampling area of $0.25\;m^2$ in July, 1999. In order to see the vertical distribution of macrobenthos in sediments, each subcore sample was divided into 5 layers with 1 cm interval up to 6 cm depth. Each subcore sample was sieved through 0.3 mm mesh screen and fixed with 10% Rose Bengal added formalin. A total of 22 faunal groups in 11 phyla were sampled and the average density was $959\;{\pm}\;584\;ind./m^2$. Foraminiferans comprised 34.8% of total specimens were the most abundant fauna, and followed by nematodes (27.5%), polychaete worms (15.7%), and benthic harpactoid copepods (10.4%). A latitudinal trend was shown in the distribution of macrobenthos; the maximum density of $1,832\;ind./m^2$ appeared at station N06 and the most poverished community occurred at station N09 with the density of $248\;ind./m^2$. The density of typical macrofaunal taxa except foraminiferans and nematods was $116\;ind./m^2$. In the vertical distribution of macrobenthos, more than 70% of macrobenthos occurred in the upper 2 cm layer, and upper 4 cm layer contained about 90% of macrofauna. Polychaete worms consisted of 22 families, and cirratulid and paraonid worms were dominant polychaete species. The prominant feeding guilds of polychaete worms were SDT (surface, descretely motile, tenaculate feeding) and SMX (surface, motile, non-jawed); they comprised more than 50% of polychaete abundance. These feeding guilds of polychaete worms suggests that the deep sea benthos should be well adapted the newly settled deposits from water column, but this should be clarified by the further studies.

Keywords

Acknowledgement

Grant : `99 심해저 광물자원탐사 사업

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