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<p>Amazon systems are renowned for their species diversity, which includes aquatic communities. However, these systems are threatened due to increasingly frequent anthropogenic activities in the biome. Understanding biodiversity distribution patterns can help mitigate the negative effects of anthropogenic alterations and develop conservation strategies for species. Thus, this study aimed to evaluate the beta diversity pattern of aquatic macrophytes and identify the factors (local, spatial, and forest cover) causing changes in the composition of these communities in Eastern Amazonia. Thirty-seven streams were sampled and distributed across seven municipalities in northeastern Pará, Brazil. A 150-m stretch of each stream was delimited to measure macrophyte composition and richness, as well as physicochemical variables. Forest coverage was obtained through satellite images and represents landscape changes. The spatial component was calculated based on the geographic distance between points. We recorded 122 species; species replacement contributed most to total beta diversity. Local environmental variables and the spatial component explained total beta diversity and species replacement, while richness difference was only explained by local environmental variables. Forest cover did not significantly alter macrophyte beta diversity. Our study contributes to increasing the understanding of how stream macrophytes respond to local and spatial factors, supporting the importance of environmental filters and dispersal limitation in the community structure of macrophytes in Eastern Amazonia.</p>

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Spatial and local factors explain macrophytes beta diversity in Amazonian streams inserted in an anthropogenic landscape

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Alexandro M. Jesus,
  • Francieli F. Bomfim,
  • Leandro Juen,
  • Luciano F. A. Montag,
  • Lenize Batista Calvão,
  • Karina Dias-Silva,
  • Victor Rennan Santos Ferreira,
  • Guilherme Sampaio Cabral,
  • Izabella Cristina da Silva Penha,
  • Gabrielly Silva Melo,
  • Beatriz Luz Silva,
  • Bethânia Oliveira de Resende,
  • Thaisa Sala Michelan

摘要

Amazon systems are renowned for their species diversity, which includes aquatic communities. However, these systems are threatened due to increasingly frequent anthropogenic activities in the biome. Understanding biodiversity distribution patterns can help mitigate the negative effects of anthropogenic alterations and develop conservation strategies for species. Thus, this study aimed to evaluate the beta diversity pattern of aquatic macrophytes and identify the factors (local, spatial, and forest cover) causing changes in the composition of these communities in Eastern Amazonia. Thirty-seven streams were sampled and distributed across seven municipalities in northeastern Pará, Brazil. A 150-m stretch of each stream was delimited to measure macrophyte composition and richness, as well as physicochemical variables. Forest coverage was obtained through satellite images and represents landscape changes. The spatial component was calculated based on the geographic distance between points. We recorded 122 species; species replacement contributed most to total beta diversity. Local environmental variables and the spatial component explained total beta diversity and species replacement, while richness difference was only explained by local environmental variables. Forest cover did not significantly alter macrophyte beta diversity. Our study contributes to increasing the understanding of how stream macrophytes respond to local and spatial factors, supporting the importance of environmental filters and dispersal limitation in the community structure of macrophytes in Eastern Amazonia.