Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Effect of Environmental Variables on Changes in Macrobenthic Communities in the Coastal Area of Inchon, Korea

인천연안 대형저서동물 군집 변동에 미치는 환경요인의 영향

  • YU Ok Hwan (Marine Living Resources Research Division, Korea Ocean Research & Development Institute) ;
  • KOH Byoung-Seol (Tidal-flat Research Center, National Fisheries Research & Development Institute) ;
  • LEE Hyung-Gon (Marine Living Resources Research Division, Korea Ocean Research & Development Institute) ;
  • LEE Jae-Hac (Marine Living Resources Research Division, Korea Ocean Research & Development Institute)
  • 유옥환 (한국해양연구원 생물자원연구본부) ;
  • 고병설 (국립수산과학원 갯벌연구센터) ;
  • 이형곤 (한국해양연구원 생물자원연구본부) ;
  • 이재학 (한국해양연구원 생물자원연구본부)
  • Published : 2004.10.01
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Abstract

In coastal area of Inchon, dredging and the disposal of dredged material for sea-wall construction and reclamation have increased in recent years. These activities may impact the benthic environment and result in changes in benthic communities, but little information is available on the extent and direction of these changes. We investigated whether there have been changes in the dominant macrobenthic species and benthic community over the last decade, and explored the relationship between environmental variables and spatial patterns of macrobenthic community structure. We sampled macrobenthos and recorded environmental variables in the coastal habitats of Inchon in March and June 2004. In total, 212 macrobenthic species were recorded during this study, predominately crustaceans $(34{\%})$, mollusks $(32{\%})$ and polychaetes $(21{\%})$. The mean density of macrobenthos was $1,393\;ind./m^{2}$.The most abundant species was Amphioplus japonicus $(20.5{\%})$, followed by Heteromastus filiformis $(14.4{\%})$, Theora fragilis $(8.2{\%})$ and Ampharete sp. $(4.0{\%})$. Over the past decade the dominant macrobenthic species in this area shifted. Multivariate analysis (multidimensional scaling) revealed significant differences in community structure among three regions: the middle part of the sampling area (B), site 8 (C) and other sites (A). Mean density varied significantly among the three regions, but no differences in the number of species and diversity (H') were observed. The distribution of the macrobenthic community was affected by environmental variables such as percentage sand content and sediment kurtosis. Species that were important in different areas included A. japonicus in region A, Raeta puchella in region B and T. fragilis in region C. The important species in regions B and C were filter-feeding bivalves, and the abundance of these species may be related to the increase in percentage sand content. We suggest that the sediment composition (percentage sand content) may be an important factor in determining the dominant species and structure of the macrobenthic communities in coastal Inchon. Long-term monitoring programs are necessary to understand ongoing changes in the benthic communities of this area.

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