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<p>This ecological study was conducted along the Cheliff River in northwestern Algeria to evaluate how water quality shapes riparian plant communities. Floristic surveys and water quality analyses were performed at ten stations across the upstream and downstream sections. The hierarchical classification distinguished four main vegetation units: the Centaurium-Sonchus (CS) unit, associated with downstream sites affected by urban wastewater; the Plantago-Medicago-Lolium (PML) unit, linked to upstream agricultural runoff; the Solanum-Melissa-Bryonia (SMB) unit, reflecting industrial influence with high sulfates and nitrates; and the Aster-Atriplex-Nicotiana (AAN) unit, indicating alkaline conditions. Redundancy analysis (RDA) confirmed that these assemblages were strongly correlated with environmental gradients, explaining 60.6% of the species-environment variation. Key drivers included pH, conductivity, nitrates, orthophosphates, and iron, which successfully differentiated pollution gradients from urban, agricultural, and industrial sources. The dominance of nitrophilous and ruderal species in highly disturbed areas signals advanced ecological degradation, while several taxa demonstrated strong tolerance to pollutants, highlighting their bioindicator potential. These findings validate the use of macrophyte communities for monitoring water quality and provide a scientific basis for managing Mediterranean river ecosystems.</p>

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Influence of water quality on the composition and distribution of riparian vegetation in the Cheliff River, Algeria

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Nassira Bouzada,
  • Adda Ababou,
  • Fatima Senouci,
  • Ali Chenaoui,
  • Abdelkader Bouthiba

摘要

This ecological study was conducted along the Cheliff River in northwestern Algeria to evaluate how water quality shapes riparian plant communities. Floristic surveys and water quality analyses were performed at ten stations across the upstream and downstream sections. The hierarchical classification distinguished four main vegetation units: the Centaurium-Sonchus (CS) unit, associated with downstream sites affected by urban wastewater; the Plantago-Medicago-Lolium (PML) unit, linked to upstream agricultural runoff; the Solanum-Melissa-Bryonia (SMB) unit, reflecting industrial influence with high sulfates and nitrates; and the Aster-Atriplex-Nicotiana (AAN) unit, indicating alkaline conditions. Redundancy analysis (RDA) confirmed that these assemblages were strongly correlated with environmental gradients, explaining 60.6% of the species-environment variation. Key drivers included pH, conductivity, nitrates, orthophosphates, and iron, which successfully differentiated pollution gradients from urban, agricultural, and industrial sources. The dominance of nitrophilous and ruderal species in highly disturbed areas signals advanced ecological degradation, while several taxa demonstrated strong tolerance to pollutants, highlighting their bioindicator potential. These findings validate the use of macrophyte communities for monitoring water quality and provide a scientific basis for managing Mediterranean river ecosystems.