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<p>This study investigates how anthropogenic impacts, local environmental variables, spatial conditions, and landscape characteristics influence fish assemblage structure in streams of the Eastern Amazon. The fieldwork was conducted in 30 streams within the Atlantic Coast/Northeast Pará hydrographic region during October 2023. Fish were sampled using circular hand nets, with six hours of effort per stream. Environmental data encompassed habitat structure, limnological parameters, spatial variables, and landscape features. A total of 7,449 individuals representing 49 species were recorded; species richness ranged from 1 to 20, and Local Contribution to Beta Diversity (LCBD) from 0.0145 to 0.0802. Richness increased with greater leaf litter cover and decreased with higher conductivity. Regarding spatial factors, richness showed a positive association with the third axis of Asymmetric Eigenvector Maps (AEM3). LCBD values increased with higher conductivity, pH, and wood debris, but decreased with greater surrounding pasture cover. Redundancy analysis (RDA) indicated that species composition could be primarily explained by local habitat characteristics such as substrate size, leaf litter, and shelter availability, as well as spatial structure represented by AEM3. Specific species were associated with distinct habitat conditions. These findings underscore the strong influence of habitat structure, physicochemical properties, and spatial dynamics on fish assemblages, highlighting their sensitivity to anthropogenic disturbances and the importance of conserving riparian environments in Amazonian stream ecosystems.</p>

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The role of environmental and anthropogenic factors in shaping fish assemblages of streams of the Atlantic Coast/Northeast Pará hydrographic region, Eastern Amazon

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Elida J. S. Cunha,
  • Antonio A. Jr Jardim,
  • Matheus S. Almeida,
  • Izabella C. S. Penha,
  • Lucas P. Oliveira,
  • Ronaldo S. Silva,
  • Danielly T. Hashiguti,
  • Leandro Juen,
  • Divino V. Silvério,
  • Luciano F. A. Montag

摘要

This study investigates how anthropogenic impacts, local environmental variables, spatial conditions, and landscape characteristics influence fish assemblage structure in streams of the Eastern Amazon. The fieldwork was conducted in 30 streams within the Atlantic Coast/Northeast Pará hydrographic region during October 2023. Fish were sampled using circular hand nets, with six hours of effort per stream. Environmental data encompassed habitat structure, limnological parameters, spatial variables, and landscape features. A total of 7,449 individuals representing 49 species were recorded; species richness ranged from 1 to 20, and Local Contribution to Beta Diversity (LCBD) from 0.0145 to 0.0802. Richness increased with greater leaf litter cover and decreased with higher conductivity. Regarding spatial factors, richness showed a positive association with the third axis of Asymmetric Eigenvector Maps (AEM3). LCBD values increased with higher conductivity, pH, and wood debris, but decreased with greater surrounding pasture cover. Redundancy analysis (RDA) indicated that species composition could be primarily explained by local habitat characteristics such as substrate size, leaf litter, and shelter availability, as well as spatial structure represented by AEM3. Specific species were associated with distinct habitat conditions. These findings underscore the strong influence of habitat structure, physicochemical properties, and spatial dynamics on fish assemblages, highlighting their sensitivity to anthropogenic disturbances and the importance of conserving riparian environments in Amazonian stream ecosystems.