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<p>Urban expansion and intensified human activities have threatened the integrity of small lotic ecosystems, particularly in high biodiversity regions such as the Amazon. This study investigated the influence of habitat quality on the biological diversity of urban streams (locally known as “<i>igarapés</i>”) in the Southwestern Amazon, focusing on the fish communities, aquatic insects of the Odonata order, and EPT (Ephemeroptera, Plecoptera, and Trichoptera) in 10 <i>igarapés</i> in Porto Velho, Rondônia, Brazil. The results revealed that preserved <i>igarapés</i> exhibited higher diversity, richness, and evenness, indicating environments which are more favorable to native biodiversity. Conversely, degraded habitats showed a high dominance of opportunistic and non-native species, such as <i>Poecilia reticulata</i>, reflecting the impacts of environmental degradation. Habitat integrity and canopy cover were identified as key variables influencing community composition. Sensitive species, such as <i>Pyrrhulina</i> cf. <i>brevis</i> and EPT families, were associated with preserved habitats, whereas generalist species, like <i>Perithemis mooma</i>, prevailed in degraded areas. These results highlight the importance of conservation and restoration strategies to mitigate anthropogenic impacts. Given the environmental variability observed in aquatic habitats, we emphasize that future studies should expand the spatial and temporal scales of sampling and reduce the taxonomic resolution for EPT analysis.</p>

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Environmental degradation and its consequences for biological diversity in urban streams of the Southwestern Amazon

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Dayana Tamiris Brito dos Santos Catâneo,
  • Paulo Vilela Cruz,
  • Leandro Juen,
  • Maria Aurea Pinheiro de Almeida Silveira,
  • Carolina Rodrigues da Costa Doria

摘要

Urban expansion and intensified human activities have threatened the integrity of small lotic ecosystems, particularly in high biodiversity regions such as the Amazon. This study investigated the influence of habitat quality on the biological diversity of urban streams (locally known as “igarapés”) in the Southwestern Amazon, focusing on the fish communities, aquatic insects of the Odonata order, and EPT (Ephemeroptera, Plecoptera, and Trichoptera) in 10 igarapés in Porto Velho, Rondônia, Brazil. The results revealed that preserved igarapés exhibited higher diversity, richness, and evenness, indicating environments which are more favorable to native biodiversity. Conversely, degraded habitats showed a high dominance of opportunistic and non-native species, such as Poecilia reticulata, reflecting the impacts of environmental degradation. Habitat integrity and canopy cover were identified as key variables influencing community composition. Sensitive species, such as Pyrrhulina cf. brevis and EPT families, were associated with preserved habitats, whereas generalist species, like Perithemis mooma, prevailed in degraded areas. These results highlight the importance of conservation and restoration strategies to mitigate anthropogenic impacts. Given the environmental variability observed in aquatic habitats, we emphasize that future studies should expand the spatial and temporal scales of sampling and reduce the taxonomic resolution for EPT analysis.