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<p>This study aimed to comprehensively analyze the accumulation and distribution patterns of polycyclic aromatic hydrocarbons (PAHs) in plankton across varying exposure durations within a simulated planktonic food chain, consisting of <i>Tetraselmis chuii</i> (phytoplankton), <i>Brachionus rotundiformis</i> (rotifers), and <i>Apocyclops sp.</i> (copepods) cultured in a gas purging system with a continuous supply of PAHs. The investigation revealed three distinct temporal phases of PAH accumulation: before 1&#xa0;h, 1–24&#xa0;h, and 24–120&#xa0;h. Notably, PAH concentrations exhibited substantial fluctuations during the initial two intervals but approached a steady state after 24&#xa0;h of exposure. An intriguing observation was the differential accumulation of high solubility (&gt; 1) PAHs, which were found in higher quantities in copepods compared to rotifers and phytoplankton. Conversely, low solubility (&lt; 1) PAHs were significantly more abundant in phytoplankton, indicating potential selectivity in PAH uptake among planktonic organisms. Principal component analysis (PCA) elucidated a clear demarcation between phytoplankton and zooplankton, suggesting distinct PAH accumulation patterns influenced by trophic levels. Linear relationship was found between the bioconcentration factor (BCF) and PAH hydrophobicity (K<sub>ow</sub>) for all PAHs within the planktonic food chain. The varying slopes in the linear regression between log BCF and log K<sub>ow</sub> for phytoplankton, rotifers, and copepods underscored the existence of diverse pathways for PAH accumulation among planktonic organisms. This study offers valuable insights into the complex dynamics of PAH bioaccumulation, with potential implications for understanding the broader ecological impacts of PAHs.</p>

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Bioaccumulation and Trophic Transfer of Polycyclic Aromatic Hydrocarbons (PAHs) in the Planktonic Base of the Aquatic Food Web

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Jing-O. Cheng,
  • Chi-Hung Chu,
  • Chun-Wen Chang,
  • Te-Hao Chen,
  • Chi-Ying Hsieh,
  • Fung-Chi Ko

摘要

This study aimed to comprehensively analyze the accumulation and distribution patterns of polycyclic aromatic hydrocarbons (PAHs) in plankton across varying exposure durations within a simulated planktonic food chain, consisting of Tetraselmis chuii (phytoplankton), Brachionus rotundiformis (rotifers), and Apocyclops sp. (copepods) cultured in a gas purging system with a continuous supply of PAHs. The investigation revealed three distinct temporal phases of PAH accumulation: before 1 h, 1–24 h, and 24–120 h. Notably, PAH concentrations exhibited substantial fluctuations during the initial two intervals but approached a steady state after 24 h of exposure. An intriguing observation was the differential accumulation of high solubility (> 1) PAHs, which were found in higher quantities in copepods compared to rotifers and phytoplankton. Conversely, low solubility (< 1) PAHs were significantly more abundant in phytoplankton, indicating potential selectivity in PAH uptake among planktonic organisms. Principal component analysis (PCA) elucidated a clear demarcation between phytoplankton and zooplankton, suggesting distinct PAH accumulation patterns influenced by trophic levels. Linear relationship was found between the bioconcentration factor (BCF) and PAH hydrophobicity (Kow) for all PAHs within the planktonic food chain. The varying slopes in the linear regression between log BCF and log Kow for phytoplankton, rotifers, and copepods underscored the existence of diverse pathways for PAH accumulation among planktonic organisms. This study offers valuable insights into the complex dynamics of PAH bioaccumulation, with potential implications for understanding the broader ecological impacts of PAHs.