Scholarlink

<p>The Brazilian tropical coast holds significant ecological and economic value, with diverse marine and estuarine habitats. Fish larval supply plays a crucial role in these ecosystems by supporting replenishment, connectivity, colonization, and ecosystem recovery. Following the 2015 Fundão dam collapse, the Doce and adjacent marine areas were influenced by a substantial influx of mining tailings, affecting local biodiversity. Here, we partition the beta diversity of fish post-larvae assemblages to identify the environmental drivers shaping the community and to provide insights for biodiversity conservation in the region. We analyzed 6,827 individuals from 136 species collected between 2018 and 2023. Our results highlight the role of environmental, hydrodynamic, and spatial gradients in shaping post-larval species composition. Species replacement, rather than species loss, overwhelmingly drove the significant spatial variation in beta diversity, accounting for an average of 71.3% of incidence-based dissimilarity (turnover, Bsim) and 65.5% of abundance-based dissimilarity (balanced variation, Bbal). Geographic distance and environmental factors, such as current, salinity, and turbidity, influenced these patterns. The Doce area exhibited higher species diversity; however, this represents a community restructured under disturbance rather than ecosystem health. Elevated turbidity was associated with reduced diversity and increased nestedness, signaling unfavorable conditions for larval supply. Together, these results suggest that the impacted area is undergoing a reorganization into a new but unstable community that diverges from reference sites and may lack key functional roles. This highlights the importance of continuous monitoring and management policies to reduce turbidity, restore impacted habitats, and safeguard biodiversity.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Temporal shifts in fish larval beta diversity in a coastal environment influenced by mining waste

  • 期刊论文

  • 发表日期：

    2026年1月16日

查看全文
  • Germano Henrique Costa Barrilli,
  • Juliana Beltramin De Biasi,
  • Mauricio Hostim-Silva,
  • Carlos Werner Hackradt,
  • Fabiana Cézar Félix-Hackradt

摘要

The Brazilian tropical coast holds significant ecological and economic value, with diverse marine and estuarine habitats. Fish larval supply plays a crucial role in these ecosystems by supporting replenishment, connectivity, colonization, and ecosystem recovery. Following the 2015 Fundão dam collapse, the Doce and adjacent marine areas were influenced by a substantial influx of mining tailings, affecting local biodiversity. Here, we partition the beta diversity of fish post-larvae assemblages to identify the environmental drivers shaping the community and to provide insights for biodiversity conservation in the region. We analyzed 6,827 individuals from 136 species collected between 2018 and 2023. Our results highlight the role of environmental, hydrodynamic, and spatial gradients in shaping post-larval species composition. Species replacement, rather than species loss, overwhelmingly drove the significant spatial variation in beta diversity, accounting for an average of 71.3% of incidence-based dissimilarity (turnover, Bsim) and 65.5% of abundance-based dissimilarity (balanced variation, Bbal). Geographic distance and environmental factors, such as current, salinity, and turbidity, influenced these patterns. The Doce area exhibited higher species diversity; however, this represents a community restructured under disturbance rather than ecosystem health. Elevated turbidity was associated with reduced diversity and increased nestedness, signaling unfavorable conditions for larval supply. Together, these results suggest that the impacted area is undergoing a reorganization into a new but unstable community that diverges from reference sites and may lack key functional roles. This highlights the importance of continuous monitoring and management policies to reduce turbidity, restore impacted habitats, and safeguard biodiversity.