The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Meiobenthic Faunal Communities of the Deep-sea Sediments in the Northeastern Pacific along a Latitudinal Transect

북동태평양 심해 퇴적물에 서식하는 중형 저서 생물군집의 위도별 특징

  • 현정호 (한국해양연구소 해양자원연구본부) ;
  • 최진우 (한국해양연구소 해양환경기후연구본부) ;
  • 이경용 (한국해양연구소 해양자원연구본부) ;
  • 김동성 (한국해양연구소 해양환경기후연구본부)
  • Published : 2000.08.31
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Abstract

This study was conducted to investigate the community structure and distributional pattern of meiobenthos in the deep sea bottoms of northeastern Pacific during July 1998. The faunal samples were collected using the multiple corer at ten stations; eight stations along the transects from 5$^{\circ}$N to 12$^{\circ}$N, and two stations in the Preservation Zone and Impact Zone of the KODOS (Korea Deep Ocean Study) area. The organic carbon content in sediments ranged from 0.79 to 1.76 mg cm$^{-3}$, and higher concentration appeared at stations in lower latitudes than 8$^{\circ}$N. The most abundant meiobenthos was nematodes and followed by foraminiferans; these two taxa comprised more than 70% of the total abundance at all stations. The most abundant meiobenthos occurred with mesh size of 0.063 nm. The maximum density of meiobenthos was 442 ind./10 cm$^2$ at station N5, and the density gradually decreased toward station N8 where the minimum density of 92 md./10 cm$^2$ was found. More than 60% of meiobenthos were distributed at surface sediment layer within 1.0 cm, and the peak abundance was found at 0-0.25 cm layer. The latitudinal distribution pattern of meiobenthos in the study area seemed to be related with the primary productivity of the surface water that is also connected to the water circulation pattern of the Pacific Ocean near the Equator, diverging at latitude of 8$^{\circ}$N and conversing at 5$^{\circ}$N.

본 연구는 심해 중형저서생물의 군집 특성을 파악하기 위해서 1998년 7월에 북동 태평양의 북위 5도에서 l2도까지 8개 정점과 KODOS(Korea Deep Ocean Study)해역의 P-zone 및 I-zon게서 각각 1개씩의 정점을 포함한 총 10개의 정점에서 MC(Multiple corer)를 사용하여 시료를 채취하였다. 퇴적물의 유기탄소함량은 표층 퇴적물 1 cm 깊이에서는 0.79${\sim}$1.76 mg cm$^{-3}$의 범위로 나타났으며, 지역적으로는 북위 8도에 위치한 정점 N8을 기준으로 남쪽에 위치한 정점들(N5${\sim}$N7)에서 북쪽의 정점들에 비해 높은 값을 보였다. 중형저서생물의 각 분류군별 조성비율을 보면 정점 N9와 정점 Nl2를 제외하고는 선충류(nematodes)가 우점하여 전 정점에서 35${\sim}$53%를 차지했으며, 다음으로는 유공충류(foraminiferans)로 이들 두 분류군이 전체 출현 개체수의 70${\sim}$82%를 차지하였다. 개체의 크기에 있어서는 0.125 mm를 통과하고 0.063 mm크기의 체에 남는 생물이 전 정점에서 가장 많은 비율을 차지하였다. 위도별 분포양상을 보면 북위 5도의 정점 N5에서 442개체/10 cm$^2$로서 가장 높은 서식밀도를 보였고, 북쪽으로 갈수록 점차 감소하는 경향을 보여 정점 N8에서 가장 낮은 밀도인 92개체/10 cm$^2$이었다. 북쪽의 정점들에서는 정점 N8보다 다소 높은 161개체/10 cm$^2$${\sim}$175개체/10 cm$^2$의 서식밀도를 보였다. 퇴적물 깊이에 따른 수직분포 양상은 대부분의 정점에서 표층 0${\sim}$0.25 cm에서 가장 높은 서식밀도를, 표층 0${\sim}$1 cm에 약 60%전후의 개체수가 밀집되어 있음을 나타내었다. 중형저서생물의 위도에 따른 분포양상은 북위 5도에서의 표층수 수렴과 북위 8도에서의 표층수 발산으로 인한 수층의 일차생산력 변화와 관련이 있는 것으로 나타났다.

Keywords

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