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<p>Damming threatens freshwater ecosystems, altering the temporal and spatial diversity of aquatic organisms. However, the scarcity of long-term data limits our understanding of these dynamics in reservoirs. We examined how impoundment of a Neotropical river influenced fish beta diversity over 15&#xa0;years. Fish were sampled in the Serra da Mesa reservoir, upper Tocantins River, Brazil, across three periods (pre-filling, filling, post-impoundment) and regions (upstream, transition, reservoir). We analyzed long-term trends in taxonomic and functional spatial beta diversity, as well as the local contribution of each region to total beta diversity (LCBD). Taxonomic beta diversity rose after impoundment, then fluctuated with a slight decline, mirroring the shift from trophic upsurge to equilibrium. Upstream sites consistently exhibited higher taxonomic LCBD, transition sites the lowest, and the reservoir showed a localized reorganization of assemblages after impoundment. In contrast, both the long-term spatial functional beta diversity and functional LCBD remained unaffected. Our study underscores the need for long-term and longitudinal assessments to better understand how dam aging shapes biodiversity patterns in reservoir ecosystems.</p>

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Damming affects the taxonomic but not the functional beta diversity of fish in a neotropical reservoir ecosystem

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月19日

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  • Vitor Manuel Barros Ferreira,
  • Natália Carneiro Lacerda dos Santos,
  • Jean Carlo Gonçalves Ortega,
  • Romullo Guimarães Lima,
  • Érica Pellegrini Caramaschi,
  • Míriam Pilz Albrecht

摘要

Damming threatens freshwater ecosystems, altering the temporal and spatial diversity of aquatic organisms. However, the scarcity of long-term data limits our understanding of these dynamics in reservoirs. We examined how impoundment of a Neotropical river influenced fish beta diversity over 15 years. Fish were sampled in the Serra da Mesa reservoir, upper Tocantins River, Brazil, across three periods (pre-filling, filling, post-impoundment) and regions (upstream, transition, reservoir). We analyzed long-term trends in taxonomic and functional spatial beta diversity, as well as the local contribution of each region to total beta diversity (LCBD). Taxonomic beta diversity rose after impoundment, then fluctuated with a slight decline, mirroring the shift from trophic upsurge to equilibrium. Upstream sites consistently exhibited higher taxonomic LCBD, transition sites the lowest, and the reservoir showed a localized reorganization of assemblages after impoundment. In contrast, both the long-term spatial functional beta diversity and functional LCBD remained unaffected. Our study underscores the need for long-term and longitudinal assessments to better understand how dam aging shapes biodiversity patterns in reservoir ecosystems.