Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Spatial Characteristics of the Macrobenthos Community Near the Nakdong River Estuary, on the Southeast Coast of Korea

낙동강 하구역 주변 대형저서동물 군집의 공간 특성

  • 이형곤 (한국해양연구원 해양생물자원연구본부) ;
  • 이재학 (한국해양연구원 해양생물자원연구본부) ;
  • 유옥환 (한국해양연구원 해양생물자원연구본부) ;
  • 김종관 (한국해양연구원 해양생물자원연구본부)
  • Published : 2005.06.30
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Abstract

Macrobeilthic fauna were collected using a van Veen grab $(0.1m^2)$ to investigate the spatial characteristics of the macrobenthos community at 28 stations near the Nakdong River estuary, Southeast Korea, in September 2001. A total of 203 species were sampled with a mean density of $1,554 ind./m^2$ and a biomass of $252.3 gWWt/m^2$. Annelids were the dominant faunal group in terms of species and density, with 68 species and a mean density of $1,031ind./m^2$, which comprised 33.5% and 66.3% of the total benthic animals, respectively. Based on density, three Polychaetes were dominant Tharyx sp· $(420ind./m^2)$, Lumbrineris longifolia $(143ind./m^2)$, and Sternaspis scutata $(118ind./m^2)$, along with a bivalve Theora fragilis $(129 ind./m^2)$. On cluster analysis, the benthic community was classified into four groups based on the species composition: Group-1 occurred in disturbed areas, Group-II in coastal regions, Group-III in central mariculture grounds, and Group-IV offshore. Environmental factors (mean gain size, organic carbon, and depth) were primarily correlated with the macrobenthos community structure. A benthic pollution assessment based on the macrobenthos community structure showed that Group-I and Group-II were located in a coastal area that had been severely disturbed by construction of Busan new port and various pollutants, Group-III was gradually polluted, while offshore Group-IV was the most stable.

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References

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