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<p>We studied a subwatershed from Doce River, whose basin was impacted by mining tailings in the greatest socioenvironmental disaster in Brazil, to try identifying tools to monitor changes since efforts for restoration started. Only physical and chemical variables do not fully capture river ecology; thus, we identified bioindicators that integrate environmental information across different land use and cover types (rural, peri-urban, and urban). Our major goal was to compare the capacity of only diatoms or the entire periphytic community for describing differences on water quality, since knowledge of periphytic bioindicators is limited in the tropics. The physical and chemical characteristics differed among the sampling stations, ranging from ultraoligotrophic to supereutrophic from upstream to downstream, according to land use/cover. The biotic variables reinforced these trends, with the most polluted urban areas showing greater periphytic biomass (252.2 ± 377.0 × 10<sup>6</sup>&#xa0;µm<sup>3</sup>&#xa0;cm<sup>−2</sup>) than peri-urban and rural zones (25.0 × 10<sup>6</sup> µm<sup>3</sup> cm<sup>−2</sup>). The community structure was significantly influenced by land use/cover and season. Diatoms dominated the periphyton at all the sampling stations, but with different species compositions, and some considered bioindicators of degraded environments&#xa0;(<i>Nitzschia palea</i>, <i>Gomphonema parvulum</i> and <i>G. lagenula</i>) were dominant only in the urban areas. Since both the total photoautotrophic periphyton community and the periphytic diatom community were similar to describe water conditions, monitoring programs should focus on diatoms because it is easier and less expensive to produce this database than to quantify the entire community.</p>

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Epilithic diatom communities as efficient bioindicators for evaluating land use impacts on a tropical watershed

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Scarlet da Encarnação de Araújo,
  • Gabriela von Rückert,
  • Cleber Cunha Figueredo

摘要

We studied a subwatershed from Doce River, whose basin was impacted by mining tailings in the greatest socioenvironmental disaster in Brazil, to try identifying tools to monitor changes since efforts for restoration started. Only physical and chemical variables do not fully capture river ecology; thus, we identified bioindicators that integrate environmental information across different land use and cover types (rural, peri-urban, and urban). Our major goal was to compare the capacity of only diatoms or the entire periphytic community for describing differences on water quality, since knowledge of periphytic bioindicators is limited in the tropics. The physical and chemical characteristics differed among the sampling stations, ranging from ultraoligotrophic to supereutrophic from upstream to downstream, according to land use/cover. The biotic variables reinforced these trends, with the most polluted urban areas showing greater periphytic biomass (252.2 ± 377.0 × 106 µm3 cm−2) than peri-urban and rural zones (25.0 × 106 µm3 cm−2). The community structure was significantly influenced by land use/cover and season. Diatoms dominated the periphyton at all the sampling stations, but with different species compositions, and some considered bioindicators of degraded environments (Nitzschia palea, Gomphonema parvulum and G. lagenula) were dominant only in the urban areas. Since both the total photoautotrophic periphyton community and the periphytic diatom community were similar to describe water conditions, monitoring programs should focus on diatoms because it is easier and less expensive to produce this database than to quantify the entire community.