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<p><i>Nitellopsis obtusa</i>, a charophyte invasive in North America, was studied in four native Central European lakes to assess its biomass dynamics and impact on macrophyte communities. Macrophyte biomass variation and Shannon–Wiener macrophyte diversity were examined seasonally in two charophyte-dominated lakes and two angiosperm-dominated lakes between 2017 and 2020. The hypothesis was adapted that seasonal variability in <i>N. obtusa</i> biomass follows a consistent pattern regardless of lake type and year of study. The study showed that <i>Nitellopsis obtusa</i> achieved higher biomass and dominance in charophyte-dominated lakes, where it negatively correlated with macrophyte diversity and richness. In angiosperm-dominated lakes, its correlations with diversity were positive. Seasonal biomass patterns of <i>N. obtusa</i> confirmed the hypothesis, showing peak biomass mainly in autumn, successful overwintering, and efficient spring-to-summer recovery regardless of annual weather variability. Principal Component Analysis highlighted distinct differences in macrophyte community structures between the two lake types and negative relationships between <i>N. obtusa</i> and angiosperms. This study demonstrates <i>N. obtusa</i> potential to alter macrophyte communities similarly to the species invasive range. Further research is needed to determine whether <i>N. obtusa</i> should maintain its status as a locally protected species in native lakes, despite its invasive nature and strong competitiveness with angiosperms.</p>

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Expansion of a native charophyte: biomass seasonality and effects on macrophyte diversity in contrasting lake types

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Mariusz Pełechaty,
  • Sarkhan Ibrahimov

摘要

Nitellopsis obtusa, a charophyte invasive in North America, was studied in four native Central European lakes to assess its biomass dynamics and impact on macrophyte communities. Macrophyte biomass variation and Shannon–Wiener macrophyte diversity were examined seasonally in two charophyte-dominated lakes and two angiosperm-dominated lakes between 2017 and 2020. The hypothesis was adapted that seasonal variability in N. obtusa biomass follows a consistent pattern regardless of lake type and year of study. The study showed that Nitellopsis obtusa achieved higher biomass and dominance in charophyte-dominated lakes, where it negatively correlated with macrophyte diversity and richness. In angiosperm-dominated lakes, its correlations with diversity were positive. Seasonal biomass patterns of N. obtusa confirmed the hypothesis, showing peak biomass mainly in autumn, successful overwintering, and efficient spring-to-summer recovery regardless of annual weather variability. Principal Component Analysis highlighted distinct differences in macrophyte community structures between the two lake types and negative relationships between N. obtusa and angiosperms. This study demonstrates N. obtusa potential to alter macrophyte communities similarly to the species invasive range. Further research is needed to determine whether N. obtusa should maintain its status as a locally protected species in native lakes, despite its invasive nature and strong competitiveness with angiosperms.