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<p>Urban river ecosystems worldwide face ecological degradation characterized by water quality deterioration and shoreline hardening, though riparian vegetation and longitudinal connectivity often remain relatively intact. As key bioindicators of aquatic health, fish communities in small-to-medium urban rivers exhibit progressive structural simplification and miniaturization under intensifying urbanization pressures. This study investigated spatial and temporal patterns of fish diversity (α- and β-diversity) across urban and peri-urban segments of the Yuhangtang River in China, employing a multidisciplinary approach combining seasonal sampling (March and July 2024) with multivariate analyses (redundancy analysis, principal component analysis, and non-metric multidimensional scaling). Our analyses revealed pronounced spatial heterogeneity in fish community structure, with urban river segments exhibiting significantly greater species richness compared to peri-urban reaches. Anthropogenic pressures emerged as critical modulators of diversity patterns, evidenced by marked declines in taxonomic richness within high-pressure zones. Furthermore, fish assemblages demonstrated distinct responses to key water quality variables (notably water depth, dissolved oxygen, and nitrate concentrations) as identified through multivariate ordination. These findings collectively indicate that urban fish diversity is governed by synergistic interactions among physicochemical conditions, seasonal climatic fluctuations, and human-induced stressors, ultimately driving divergent community structures across environmental gradients. These findings collectively demonstrate that urban fish diversity is shaped by synergistic interactions between natural hydrological factors and anthropogenic pressures, with community structure diverging under varying environmental conditions. By elucidating these relationships, our study provides actionable insights for managing subtropical urban rivers and conserving freshwater biodiversity amidst rapid urbanization.</p>

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Effects of water quality and hydrologic factors on fish diversity in subtropical urban river ecosystems

  • 期刊论文

  • 发表日期：

    2026年1月24日

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  • Qiaoyu Cui,
  • Fangbo Qiu,
  • Chao Li,
  • Yiang Wang,
  • Dan Han,
  • Yan Huang

摘要

Urban river ecosystems worldwide face ecological degradation characterized by water quality deterioration and shoreline hardening, though riparian vegetation and longitudinal connectivity often remain relatively intact. As key bioindicators of aquatic health, fish communities in small-to-medium urban rivers exhibit progressive structural simplification and miniaturization under intensifying urbanization pressures. This study investigated spatial and temporal patterns of fish diversity (α- and β-diversity) across urban and peri-urban segments of the Yuhangtang River in China, employing a multidisciplinary approach combining seasonal sampling (March and July 2024) with multivariate analyses (redundancy analysis, principal component analysis, and non-metric multidimensional scaling). Our analyses revealed pronounced spatial heterogeneity in fish community structure, with urban river segments exhibiting significantly greater species richness compared to peri-urban reaches. Anthropogenic pressures emerged as critical modulators of diversity patterns, evidenced by marked declines in taxonomic richness within high-pressure zones. Furthermore, fish assemblages demonstrated distinct responses to key water quality variables (notably water depth, dissolved oxygen, and nitrate concentrations) as identified through multivariate ordination. These findings collectively indicate that urban fish diversity is governed by synergistic interactions among physicochemical conditions, seasonal climatic fluctuations, and human-induced stressors, ultimately driving divergent community structures across environmental gradients. These findings collectively demonstrate that urban fish diversity is shaped by synergistic interactions between natural hydrological factors and anthropogenic pressures, with community structure diverging under varying environmental conditions. By elucidating these relationships, our study provides actionable insights for managing subtropical urban rivers and conserving freshwater biodiversity amidst rapid urbanization.