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Effects of Dredging-Derived Suspended Solids on the Growth of the Marine Diatom (Skeletonema costatum)

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2026, 35(2), pp.103~115
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering
  • Received : February 6, 2026
  • Accepted : March 24, 2026
  • Published : April 30, 2026

Jiun Kang 1,  Jeongjun Lee 2,  lee kwon seob ORD ID 2,  Sung-Jun Kim 2

1전남대학교 환경에너지공학과
2전남대학교

Accredited

ABSTRACT

Dredging and port development generate suspended solids (SS) that may affect marine ecosystems, while environmental impact assessments have largely relied on SS concentration changes as a key indicator. However, this approach provides limited quantitative linkage to biological responses. Here, we evaluated the growth response of the marine diatom Skeletonema costatum exposed to dredging-derived SS to quantify concentration-response relationships. SS prepared from seafloor sediments collected in Gangjin Bay and Gwangyang Bay were tested using a 72-h algal growth inhibition assay, and toxicity indicators were derived from relative growth rate data. Growth inhibition increased with SS concentration in both regions. Probit analysis showed a lower EC50 for Gwangyang Bay SS than for Gangjin Bay SS, indicating regional differences in sensitivity. In addition, analyses of sediment physicochemical properties and metal composition indicated that the Gwangyang Bay sample was finer and showed more reductive sediment characteristics than the Gangjin Bay sample, whereas metal concentrations in both regions were generally below the domestic marine sediment quality guideline level. The concentration-response relationships and toxicity indicators presented here can support evaluation of potential biological effects by comparison with SS concentrations predicted during dredging. By providing quantitative response data for suspended-phase exposure, particularly for primary producers, this study offers baseline information to strengthen marine environmental impact assessment.

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