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<p>Epiphytic diatoms are an important component of primary producers in shallow lakes, while their seasonal variations and host specificity remain poorly understood. A total of 78 macrophyte samples were collected from a large shallow floodplain lake between April 2023 and July 2024, including <i>Potamogeton crispus</i> (<i>n</i> = 42) and <i>Trapa bispinosa</i> (<i>n</i> = 36). Epiphytic diatom assemblages were dominated by <i>Achnanthidium minutissimum</i><i>, </i><i>Aulacoseira ambigua</i><i>, </i><i>Aulacoseira granulata</i><i>, </i><i>Ulnaria ulna</i>, <i>Ulnaria acus,</i> and <i>Fragilaria nanana.</i> A seasonal shift was observed: <i>Aulacoseira</i> species, <i>U. ulna</i> and <i>U. acus</i> dominated in cold seasons, while <i>A. minutissimum</i> became dominant in warm seasons. PERMANOVA analysis revealed that host did not significantly contribute to structuring the epiphytic diatom communities. Distance-based&#xa0;redundancy analyses revealed that dissolved silicon, water temperature, total phosphorus were significant variables influencing diatom assemblages, highlighting the effects of nutrients and temperature on epiphytic diatoms. Besides the three significant variables, Secchi depth&#xa0;was positively correlated with several diatom taxa (e.g., <i>Fragilaria nanana</i>).&#xa0;The results advance our understanding of seasonal changes in epiphytic diatoms and their relationship with aquatic plants and environmental factors, with important implications for bioassessment and paleolimnological reconstructions using epiphytic diatoms.</p>

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Seasonal changes in epiphytic diatoms and their relationship with environmental factors in a large shallow lake of the Yangtze floodplain

  • 期刊论文

  • 发表日期：

    2026年5月16日

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  • Xiangqun Wu,
  • Tao Li,
  • Xinbo Liu,
  • Yufeng Ren,
  • Hui Liu,
  • Jun He,
  • Linghan Zeng,
  • Xu Chen

摘要

Epiphytic diatoms are an important component of primary producers in shallow lakes, while their seasonal variations and host specificity remain poorly understood. A total of 78 macrophyte samples were collected from a large shallow floodplain lake between April 2023 and July 2024, including Potamogeton crispus (n = 42) and Trapa bispinosa (n = 36). Epiphytic diatom assemblages were dominated by Achnanthidium minutissimum, Aulacoseira ambigua, Aulacoseira granulata, Ulnaria ulna, Ulnaria acus, and Fragilaria nanana. A seasonal shift was observed: Aulacoseira species, U. ulna and U. acus dominated in cold seasons, while A. minutissimum became dominant in warm seasons. PERMANOVA analysis revealed that host did not significantly contribute to structuring the epiphytic diatom communities. Distance-based redundancy analyses revealed that dissolved silicon, water temperature, total phosphorus were significant variables influencing diatom assemblages, highlighting the effects of nutrients and temperature on epiphytic diatoms. Besides the three significant variables, Secchi depth was positively correlated with several diatom taxa (e.g., Fragilaria nanana). The results advance our understanding of seasonal changes in epiphytic diatoms and their relationship with aquatic plants and environmental factors, with important implications for bioassessment and paleolimnological reconstructions using epiphytic diatoms.