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<p>Human activities are causing a severe decline in fish species diversity globally. Although biodiversity is inherently multidimensional, most previous studies have concentrated on taxonomic changes, neglecting functional and phylogenetic dimensions, therefore limiting our understanding of biodiversity changes. The Yangtze River, an ecologically and economically critical system, supports high fish biodiversity and important fisheries. Yet, the spatio temporal patterns and anthropogenic drivers of biodiversity changes over the past decades remain unclear. We compiled a comprehensive fish occurrence dataset covering 56 geographic units across the Yangtze River Basin for historical (1976–2010) and current (2011–2020) periods. We assessed taxonomic, functional, and phylogenetic richness and dissimilarity, and quantified overall changes using the Cumulative Change in Biodiversity Facets (CCBF) index. Over 80% of units declined in all three richness facets, while dissimilarity generally increased, particularly in the middle and lower mainstem. CCBF values (0–12) that reflect the overall magnitude of biodiversity reorganization were highest in the middle reaches, with the Mainstream region experiencing the strongest biodiversity changes between historical and current periods. Changes were primarily driven by human disturbances, including river fragmentation, consumptive water use, and urbanization. These declines in multidimensional biodiversity may reduce ecosystem resilience and fishery productivity, and threaten the long-term sustainability of fish stocks. The loss of functional and phylogenetic diversity could especially weaken the capacity of fish communities to withstand environmental fluctuations and recover from disturbances. Our findings highlight the urgent need to integrate taxonomic, functional, and phylogenetic dimensions into conservation strategies—such as trait-based restoration and phylogenetically informed protected areas—to enhance resilience and mitigate biodiversity loss in large river systems.</p>

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Human impacts on fish biodiversity in the Yangtze River Basin: a multidimensional assessment using the Cumulative Change in Biodiversity Facets (CCBF) index

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Juan Du,
  • Kangshun Zhao,
  • Sébastien Brosse,
  • Guoyu He,
  • Jun Xu,
  • Lixiong Yu,
  • Daqing Chen,
  • Mingdian Liu,
  • Xinbin Duan,
  • Guohuan Su

摘要

Human activities are causing a severe decline in fish species diversity globally. Although biodiversity is inherently multidimensional, most previous studies have concentrated on taxonomic changes, neglecting functional and phylogenetic dimensions, therefore limiting our understanding of biodiversity changes. The Yangtze River, an ecologically and economically critical system, supports high fish biodiversity and important fisheries. Yet, the spatio temporal patterns and anthropogenic drivers of biodiversity changes over the past decades remain unclear. We compiled a comprehensive fish occurrence dataset covering 56 geographic units across the Yangtze River Basin for historical (1976–2010) and current (2011–2020) periods. We assessed taxonomic, functional, and phylogenetic richness and dissimilarity, and quantified overall changes using the Cumulative Change in Biodiversity Facets (CCBF) index. Over 80% of units declined in all three richness facets, while dissimilarity generally increased, particularly in the middle and lower mainstem. CCBF values (0–12) that reflect the overall magnitude of biodiversity reorganization were highest in the middle reaches, with the Mainstream region experiencing the strongest biodiversity changes between historical and current periods. Changes were primarily driven by human disturbances, including river fragmentation, consumptive water use, and urbanization. These declines in multidimensional biodiversity may reduce ecosystem resilience and fishery productivity, and threaten the long-term sustainability of fish stocks. The loss of functional and phylogenetic diversity could especially weaken the capacity of fish communities to withstand environmental fluctuations and recover from disturbances. Our findings highlight the urgent need to integrate taxonomic, functional, and phylogenetic dimensions into conservation strategies—such as trait-based restoration and phylogenetically informed protected areas—to enhance resilience and mitigate biodiversity loss in large river systems.