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<p>Excessive nutrient input significantly alters the water quality and biodiversity of lentic ecosystems, such as lakes and reservoirs. Understanding the relationship between trophic state, biodiversity, and ecosystem functioning has long been a central focus in aquatic ecology. Numerous studies have demonstrated a negative correlation between trophic states and both biodiversity and ecosystem functioning. However, the interaction between biodiversity and ecosystem function across different trophic states remains relatively underexplored. In this study, data from 37 lentic environments in the Shandong province of northern China were collected to assess the relationship between phytoplankton biodiversity and resource use efficiency (RUE) across different trophic states. Results demonstrated that taxonomic diversity species richness (SR) and functional divergence (F<sub>Div</sub>) are key contributors to RUE, followed by trophic state index. Specifically, SR exhibited a significant positive correlation with RUE under both mesotrophic and eutrophic levels. However, evenness presented a significant negative correlation with RUE across all three trophic states, with a more pronounced effect observed under eutrophic levels. In contrast, no significant correlation was observed between F<sub>Div</sub> and RUE. Overall, our findings suggest that it is crucial to consider trophic states when examining the relationship between biodiversity and ecosystem functions in lentic freshwater systems.</p>

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Nutrient enrichment modulates phytoplankton biodiversity-resource use efficiency relationships in temperate lakes and reservoirs of Northern China

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Peixun Zhu,
  • Mengdi Ma,
  • Yujun Jin,
  • Xuwang Yin,
  • Zhongzhu Zhu,
  • Shuaishuai Wang,
  • Shuqin Shang

摘要

Excessive nutrient input significantly alters the water quality and biodiversity of lentic ecosystems, such as lakes and reservoirs. Understanding the relationship between trophic state, biodiversity, and ecosystem functioning has long been a central focus in aquatic ecology. Numerous studies have demonstrated a negative correlation between trophic states and both biodiversity and ecosystem functioning. However, the interaction between biodiversity and ecosystem function across different trophic states remains relatively underexplored. In this study, data from 37 lentic environments in the Shandong province of northern China were collected to assess the relationship between phytoplankton biodiversity and resource use efficiency (RUE) across different trophic states. Results demonstrated that taxonomic diversity species richness (SR) and functional divergence (FDiv) are key contributors to RUE, followed by trophic state index. Specifically, SR exhibited a significant positive correlation with RUE under both mesotrophic and eutrophic levels. However, evenness presented a significant negative correlation with RUE across all three trophic states, with a more pronounced effect observed under eutrophic levels. In contrast, no significant correlation was observed between FDiv and RUE. Overall, our findings suggest that it is crucial to consider trophic states when examining the relationship between biodiversity and ecosystem functions in lentic freshwater systems.