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<p>Aquatic fungi play critical roles in carbon cycling through complex interactions with dissolved organic matter (DOM). However, their community associations with DOM across reservoir ecosystems remain poorly understood. This study investigated the relationships between fungal community structure and chromophoric DOM across Japanese reservoirs based on fungal sequencing and the optical properties of DOM. Fungal α-diversity showed positive correlations with DOM quantitative indicators (absorption coefficients and fluorescence peaks) and quality indicators such as peak M: T (ratio of humic-like to protein-like fluorescence), suggesting that greater DOM quantity and humification were associated with higher fungal α-diversity across reservoirs. Permutational multivariate analysis of variance based on Jaccard dissimilarity revealed that DOM humification indicators were associated with fungal community β-diversity in univariate models; for example, humification degree (peak M: T) explained 2.8% of the variation in fungal community composition (R² = 0.028, <i>p</i> = 0.003). Mediation analysis further suggested significant indirect associations between fungal diversity (Simpson index) and humification-related DOM patterns under the total nitrogen concentration gradient in both model directions (ACME = 0.151, <i>p</i> = 0.010; ACME = 0.100, <i>p</i> = 0.046, respectively). In contrast, the mediation models with absorption at 254&#xa0;nm exhibited weaker patterns, suggesting that peak M: T is a more sensitive proxy for detecting fungi and DOM associations. Overall, these results indicate consistent cross-reservoir relationships between fungal community structure and DOM properties and support the use of mediation analysis as an exploratory framework for evaluating potential indirect relationships between DOM and fungal diversity. This study highlighted the multiple roles of fungi in freshwater carbon cycling.</p>

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Relationships between fungal community structure and chromophoric dissolved organic matter across reservoirs

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Guo Chen,
  • Maiko Kagami,
  • Hideyuki Doi,
  • Kensuke Seto,
  • Shunsuke Matsuoka,
  • Chihiro Yoshimura

摘要

Aquatic fungi play critical roles in carbon cycling through complex interactions with dissolved organic matter (DOM). However, their community associations with DOM across reservoir ecosystems remain poorly understood. This study investigated the relationships between fungal community structure and chromophoric DOM across Japanese reservoirs based on fungal sequencing and the optical properties of DOM. Fungal α-diversity showed positive correlations with DOM quantitative indicators (absorption coefficients and fluorescence peaks) and quality indicators such as peak M: T (ratio of humic-like to protein-like fluorescence), suggesting that greater DOM quantity and humification were associated with higher fungal α-diversity across reservoirs. Permutational multivariate analysis of variance based on Jaccard dissimilarity revealed that DOM humification indicators were associated with fungal community β-diversity in univariate models; for example, humification degree (peak M: T) explained 2.8% of the variation in fungal community composition (R² = 0.028, p = 0.003). Mediation analysis further suggested significant indirect associations between fungal diversity (Simpson index) and humification-related DOM patterns under the total nitrogen concentration gradient in both model directions (ACME = 0.151, p = 0.010; ACME = 0.100, p = 0.046, respectively). In contrast, the mediation models with absorption at 254 nm exhibited weaker patterns, suggesting that peak M: T is a more sensitive proxy for detecting fungi and DOM associations. Overall, these results indicate consistent cross-reservoir relationships between fungal community structure and DOM properties and support the use of mediation analysis as an exploratory framework for evaluating potential indirect relationships between DOM and fungal diversity. This study highlighted the multiple roles of fungi in freshwater carbon cycling.