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<p>Eutrophication of lakes threatens the biodiversity of water bodies and the balance of ecosystems. Diatoms and cyanobacteria, as indicator algae of eutrophication in water bodies, show different distribution characteristics in winter and summer, and the differences caused by nutrients lack in-depth studies. We studied <i>Cyclotella meneghiniana</i> and <i>Microcystis aeruginosa</i> by controlling the concentration of dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP) (0.2&#xa0;mg-P L<sup>−1</sup>) and different nitrogen-phosphorus ratios (N/P = 4–50), to explore the growth, photosynthesis, nutrient metabolism, and oxidative stress on <i>C. meneghiniana</i> and <i>M. aeruginosa</i>. The results suggest that P form regulation of bioavailability drives algal growth and reproduction. DOP facilitated the uptake and utilization by <i>C. meneghiniana</i> but significantly inhibited the growth of <i>M. aeruginosa</i>. The high N/P ratio (N/P ratio = 50) environment significantly promoted the growth of <i>C. meneghiniana</i> (23.0 to 94.5% enhancement) and reduced the microcystin quota of <i>M. aeruginosa</i> (13.2 to 47.5% reduction). Further analysis showed that DIP promotes excessive P uptake by individual <i>C. meneghiniana</i> cells, leading to up-regulation of superoxide dismutase activity (SOD) and, thus, inhibiting its growth. <i>Microcystis aeruginosa</i> can effectively utilize DIP but not DOP. This study improves the theoretical framework for the regulation of diatom and cyanobacterial growth by common nutrients in lakes and provides a theoretical basis and regulatory threshold for the ecological prevention and control of diatom and cyanobacterial blooms.</p>

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Differential effects of phosphorus form and nitrogen-phosphorus ratio on Cyclotella meneghiniana and Microcystis aeruginosa

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Zhaolong Han,
  • Jiaqing Xiong,
  • Jiajia Zhou,
  • Zhenyao Wang,
  • Jiaxing Xu,
  • Qionghua Zhang,
  • Yanzheng Liu

摘要

Eutrophication of lakes threatens the biodiversity of water bodies and the balance of ecosystems. Diatoms and cyanobacteria, as indicator algae of eutrophication in water bodies, show different distribution characteristics in winter and summer, and the differences caused by nutrients lack in-depth studies. We studied Cyclotella meneghiniana and Microcystis aeruginosa by controlling the concentration of dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP) (0.2 mg-P L−1) and different nitrogen-phosphorus ratios (N/P = 4–50), to explore the growth, photosynthesis, nutrient metabolism, and oxidative stress on C. meneghiniana and M. aeruginosa. The results suggest that P form regulation of bioavailability drives algal growth and reproduction. DOP facilitated the uptake and utilization by C. meneghiniana but significantly inhibited the growth of M. aeruginosa. The high N/P ratio (N/P ratio = 50) environment significantly promoted the growth of C. meneghiniana (23.0 to 94.5% enhancement) and reduced the microcystin quota of M. aeruginosa (13.2 to 47.5% reduction). Further analysis showed that DIP promotes excessive P uptake by individual C. meneghiniana cells, leading to up-regulation of superoxide dismutase activity (SOD) and, thus, inhibiting its growth. Microcystis aeruginosa can effectively utilize DIP but not DOP. This study improves the theoretical framework for the regulation of diatom and cyanobacterial growth by common nutrients in lakes and provides a theoretical basis and regulatory threshold for the ecological prevention and control of diatom and cyanobacterial blooms.