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Abstract <p>The study focuses on determining the origin of organic matter (OM) and its spatial distribution in the bottom sediments of Peter the Great Bay, as well as assessing their contamination by petroleum hydrocarbons. Low-molecular-weight <i>n-</i>alkanes and with even carbon-number predominance dominate the hydrocarbon composition. The molecular distribution of saturated hydrocarbons and diagnostic ratios indicate a predominantly marine origin of OM, with evidence of bacterial reworking. Coastal zones exhibit additional OM inputs from terrigenous runoff and macrophytes, particularly <i>Zostera</i> <i>spp</i>. (eelgrass). Notably, macrophyte-derived OM was detected at deep-sea stations, likely transported by submesoscale eddies. While the overall petroleum contamination in Peter the Great Bay was classified as low, localized areas near heavy maritime traffic showed elevated contamination levels, which may adversely affect benthic biodiversity.</p>

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Organic Matter Origin and Petroleum Contamination in Bottom Sediments of Peter the Great Bay (Sea of Japan)

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • D. A. Isakova,
  • Yu. V. Koudryashova,
  • T. L. Chizhova,
  • N. S. Polonik

摘要

Abstract

The study focuses on determining the origin of organic matter (OM) and its spatial distribution in the bottom sediments of Peter the Great Bay, as well as assessing their contamination by petroleum hydrocarbons. Low-molecular-weight n-alkanes and with even carbon-number predominance dominate the hydrocarbon composition. The molecular distribution of saturated hydrocarbons and diagnostic ratios indicate a predominantly marine origin of OM, with evidence of bacterial reworking. Coastal zones exhibit additional OM inputs from terrigenous runoff and macrophytes, particularly Zostera spp. (eelgrass). Notably, macrophyte-derived OM was detected at deep-sea stations, likely transported by submesoscale eddies. While the overall petroleum contamination in Peter the Great Bay was classified as low, localized areas near heavy maritime traffic showed elevated contamination levels, which may adversely affect benthic biodiversity.