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<p>This study analyzed 2447 datasets collected from Korean estuaries between 2008 and 2019, which include species density and six environmental variables, to characterize Bacillariophyta assemblages. Salinity optima and tolerance values were calculated, and correlation analysis, along with SHAP (Random Forest) analysis, was conducted to identify key environmental factors influencing the distribution of salinity groups. The correlation analysis classified the top 30 species into three response groups based on their abundance in relation to salinity gradients: increasing, stable, and decreasing. Notably, species such as <i>Nitzschia inconspicua</i> Grunow, 1862 exhibited high salinity tolerance, highlighting their adaptability to variable estuarine conditions. SHAP analysis revealed that salinity was the dominant factor shaping Bacillariophyta assemblages in brackish and marine environments, while total nitrogen was identified as the most influential factor in freshwater systems. These findings provide valuable insights into the adaptability and ecological significance of benthic diatoms in transitional zones, emphasizing the need for continued monitoring to assess the impacts of climate change and anthropogenic activities on estuarine biodiversity.</p>

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Long-term analysis of Bacillariophyta assemblages in Korean estuaries: effects of salinity gradients and environmental factors (2008–2019)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月30日

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  • Hyunsu Yoo,
  • Chang Woo Ji,
  • Ihn-Sil Kwak

摘要

This study analyzed 2447 datasets collected from Korean estuaries between 2008 and 2019, which include species density and six environmental variables, to characterize Bacillariophyta assemblages. Salinity optima and tolerance values were calculated, and correlation analysis, along with SHAP (Random Forest) analysis, was conducted to identify key environmental factors influencing the distribution of salinity groups. The correlation analysis classified the top 30 species into three response groups based on their abundance in relation to salinity gradients: increasing, stable, and decreasing. Notably, species such as Nitzschia inconspicua Grunow, 1862 exhibited high salinity tolerance, highlighting their adaptability to variable estuarine conditions. SHAP analysis revealed that salinity was the dominant factor shaping Bacillariophyta assemblages in brackish and marine environments, while total nitrogen was identified as the most influential factor in freshwater systems. These findings provide valuable insights into the adaptability and ecological significance of benthic diatoms in transitional zones, emphasizing the need for continued monitoring to assess the impacts of climate change and anthropogenic activities on estuarine biodiversity.