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<p>The Jiupan River, a tributary of the Three Gorges Reservoir in the upper Yangtze River, plays a crucial role in regional aquatic biodiversity conservation due to its preserved natural hydrological regime and ecological heterogeneity. A total of 45 fish species were recorded in this study, dominated by Cyprinidae, and characterized by bottom-dwelling, rheophilic, and omnivorous traits. Three dominant species—<i>Schizothorax prenanti</i>, <i>Discogobio yunnanensis</i>, and <i>Aristichthys nobilis</i>—accounted for over 60% of the community biomass. Diversity indices increased from upstream to downstream, and abundance–biomass comparison curves indicated stable communities with limited disturbance. Canonical correspondence analysis (CCA) indicated that the environmental factors influencing fish community structure ranked in the following order: flow velocity, transparency, and chemical oxygen demand (COD). The presence of endemic and protected species, as well as transitional migratory individuals such as <i>Myxocyprinus asiaticus</i>, suggests that the Jiupan River may function as an ecological refuge or spawning ground. However, threats such as invasive species, impacts from small hydropower, and organic pollution persist. We recommend enhancing ecological monitoring, managing non-native species, and maintaining ecological flows to safeguard the river’s conservation value within the Yangtze Basin.</p>

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Fish community and its relationships with environmental factors in the Jiupan River, a secondary tributary of the Three Gorges Reservoir

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Junquan Ren,
  • Zhenxin Chen,
  • Kaiyang Wu,
  • Lilong Chen,
  • Rongchao He,
  • Mengqiao Long,
  • Yankun Shen,
  • Hanlin Wang,
  • Mei Fu,
  • Hongjian Lv,
  • Weizhi Yao

摘要

The Jiupan River, a tributary of the Three Gorges Reservoir in the upper Yangtze River, plays a crucial role in regional aquatic biodiversity conservation due to its preserved natural hydrological regime and ecological heterogeneity. A total of 45 fish species were recorded in this study, dominated by Cyprinidae, and characterized by bottom-dwelling, rheophilic, and omnivorous traits. Three dominant species—Schizothorax prenanti, Discogobio yunnanensis, and Aristichthys nobilis—accounted for over 60% of the community biomass. Diversity indices increased from upstream to downstream, and abundance–biomass comparison curves indicated stable communities with limited disturbance. Canonical correspondence analysis (CCA) indicated that the environmental factors influencing fish community structure ranked in the following order: flow velocity, transparency, and chemical oxygen demand (COD). The presence of endemic and protected species, as well as transitional migratory individuals such as Myxocyprinus asiaticus, suggests that the Jiupan River may function as an ecological refuge or spawning ground. However, threats such as invasive species, impacts from small hydropower, and organic pollution persist. We recommend enhancing ecological monitoring, managing non-native species, and maintaining ecological flows to safeguard the river’s conservation value within the Yangtze Basin.