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<p>Palaeohydrological reconstructions of lacustrine environments using testate amoebae based on changes in the morphotrait composition (MC) and species structure (SS) of assemblages sometimes yield contradictory results. The aim of this study was to compare the environmental variables influencing benthic testate amoebae assemblage MCs and SSs along a depth gradient in two stratified freshwater lakes: Glubokoe and Valdayskoe, Russia. Redundancy and k-means analysis led to the identification of four MC-based groups in both lakes, one associated with the littoral zone, two with the metalimnion-profundal zone and one with the profundal zone, whereas for SS, there were six groups associated with littoral, metalimnion and profundal zones separately in each lake. The possible roles of the oxygen-reduction potential (ORP), conductivity (COND), suspended solids and oxygen content in the formation of MC and SS in stratified freshwater lakes were demonstrated. MC and SS were more impacted by ORP and COND, respectively. Thus, the MC and SS of testate amoebae could provide independent information on environmental changes that should be taken into account when palaeoenvironments are reconstructed.</p>

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Morphotrait composition and species structure of benthic lacustrine testate amoebae provide independent information for palaeoreconstructions

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Vlad V. Sysoev,
  • Alisa A. Neplyukhina,
  • Fedor Y. Reshetnikov,
  • Aisylu G. Ibragimova,
  • Olga N. Zagumyonnaya,
  • John P. Smol,
  • Denis V. Tikhonenkov

摘要

Palaeohydrological reconstructions of lacustrine environments using testate amoebae based on changes in the morphotrait composition (MC) and species structure (SS) of assemblages sometimes yield contradictory results. The aim of this study was to compare the environmental variables influencing benthic testate amoebae assemblage MCs and SSs along a depth gradient in two stratified freshwater lakes: Glubokoe and Valdayskoe, Russia. Redundancy and k-means analysis led to the identification of four MC-based groups in both lakes, one associated with the littoral zone, two with the metalimnion-profundal zone and one with the profundal zone, whereas for SS, there were six groups associated with littoral, metalimnion and profundal zones separately in each lake. The possible roles of the oxygen-reduction potential (ORP), conductivity (COND), suspended solids and oxygen content in the formation of MC and SS in stratified freshwater lakes were demonstrated. MC and SS were more impacted by ORP and COND, respectively. Thus, the MC and SS of testate amoebae could provide independent information on environmental changes that should be taken into account when palaeoenvironments are reconstructed.