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<p>The aim of this inquiry was to evaluate the efficacy of the Q(r) index, designed for river environments and applied for the first time to Turkish rivers, in delineating the water quality of the Çorum Stream. We were also intrigued by deducing the primary pollutants via trait-oriented phytoplankton community analysis and evaluating the functional categories that impact the final estimations of the Q(r) index. Monthly collection of environmental parameters and phytoplankton samples were conducted at six locations (St1‒St6). Despite seasonal variations, “good” water quality was generally found in upstream (St1, St2), where slow-flowing and mesotrophic conditions prevailed. Seasonal monitoring revealed that water quality in the midstream sites (St3 and St4) deteriorated to a "poor" status between spring and autumn, whereas the downstream sites (St5 and St6) maintained a "moderate" quality level year-round.While St3 and St4 exhibited elevated organic matter levels and eutrophic conditions, St5 and St6 demonstrated increased flow rates and mixed water characteristics. Principal Component Analysis (PCA) highlighted that DO, Temp, TP and PO<sub>4</sub>-P emerged as the primary environmental factors affecting phytoplankton communities in the Çorum Stream (<i>P</i> &lt; 0.05). In the phytoplankton community, Euglenozoa became the dominant division, constituting 56.8% of the total biovolume and comprising 17 taxa. <i>Lepocinclis ovum</i>, <i>Euglenaformis proxima</i>, and <i>Ulnaria ulna</i> were determined as the most dominant species among phytoplanktonic taxa of the Çorum Stream. Some FGs (W1, MP, T<sub>C</sub>) being linked to high Q(r) values, their dominance influenced water quality estimation performed by the Q(r). We conclude that the Q(r) index proved effective in evaluating the lotic water ecosystems.</p>

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Assessing ecological quality of a stream using trait-based Phytoplankton approach

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Süleyman İpek,
  • Faruk Maraşlıoğlu

摘要

The aim of this inquiry was to evaluate the efficacy of the Q(r) index, designed for river environments and applied for the first time to Turkish rivers, in delineating the water quality of the Çorum Stream. We were also intrigued by deducing the primary pollutants via trait-oriented phytoplankton community analysis and evaluating the functional categories that impact the final estimations of the Q(r) index. Monthly collection of environmental parameters and phytoplankton samples were conducted at six locations (St1‒St6). Despite seasonal variations, “good” water quality was generally found in upstream (St1, St2), where slow-flowing and mesotrophic conditions prevailed. Seasonal monitoring revealed that water quality in the midstream sites (St3 and St4) deteriorated to a "poor" status between spring and autumn, whereas the downstream sites (St5 and St6) maintained a "moderate" quality level year-round.While St3 and St4 exhibited elevated organic matter levels and eutrophic conditions, St5 and St6 demonstrated increased flow rates and mixed water characteristics. Principal Component Analysis (PCA) highlighted that DO, Temp, TP and PO4-P emerged as the primary environmental factors affecting phytoplankton communities in the Çorum Stream (P < 0.05). In the phytoplankton community, Euglenozoa became the dominant division, constituting 56.8% of the total biovolume and comprising 17 taxa. Lepocinclis ovum, Euglenaformis proxima, and Ulnaria ulna were determined as the most dominant species among phytoplanktonic taxa of the Çorum Stream. Some FGs (W1, MP, TC) being linked to high Q(r) values, their dominance influenced water quality estimation performed by the Q(r). We conclude that the Q(r) index proved effective in evaluating the lotic water ecosystems.