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<p>Lake sediments often accumulate zooplankton resting eggs. However, eggs may lose viability due to adverse biologic, chemical, and physical conditions in the sediments. While many studies have evaluated how environmental cues affect diapause termination, few have examined how environmental conditions affect resting eggs during diapause maintenance. This study investigated the effects of sediment water content (wet and dried sediments) and desiccation duration (0 [4&#xa0;days—no sediment storage], 3, and 6&#xa0;months) on hatchling numbers (nauplii) of the calanoid <i>Notodiaptomus iheringi</i> inhabiting one permanent and one temporary lake. Desiccated sediments did not differ in nauplii numbers. However, wet sediments stored for 3 and 6&#xa0;months prior to hatching experiments showed less nauplii compared to non-stored wet sediments. Under no sediment storage, dry sediments produced fewer hatchlings than wet sediments in the permanent lake, while no differences were observed in the temporary lake. Dry sediments yielded more nauplii after 3 and 6&#xa0;months compared to their respective wet sediments in both lakes, suggesting that <i>ex situ</i> storage of wet sediments might be detrimental for <i>N. iheringi</i> resting eggs. Therefore, if sediments need to be stored before hatching experiments or for zooplankton translocation, desiccating sediments should be considered to enhance hatchling numbers.</p>

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Effects of sediment desiccation of varying durations on the hatching of resting eggs of a freshwater calanoid copepod

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Julio Crystian P. Silva,
  • Letícia S. Batista,
  • Ana Clara L. Caetano,
  • Reinaldo L. Bozelli,
  • Jayme M. Santangelo

摘要

Lake sediments often accumulate zooplankton resting eggs. However, eggs may lose viability due to adverse biologic, chemical, and physical conditions in the sediments. While many studies have evaluated how environmental cues affect diapause termination, few have examined how environmental conditions affect resting eggs during diapause maintenance. This study investigated the effects of sediment water content (wet and dried sediments) and desiccation duration (0 [4 days—no sediment storage], 3, and 6 months) on hatchling numbers (nauplii) of the calanoid Notodiaptomus iheringi inhabiting one permanent and one temporary lake. Desiccated sediments did not differ in nauplii numbers. However, wet sediments stored for 3 and 6 months prior to hatching experiments showed less nauplii compared to non-stored wet sediments. Under no sediment storage, dry sediments produced fewer hatchlings than wet sediments in the permanent lake, while no differences were observed in the temporary lake. Dry sediments yielded more nauplii after 3 and 6 months compared to their respective wet sediments in both lakes, suggesting that ex situ storage of wet sediments might be detrimental for N. iheringi resting eggs. Therefore, if sediments need to be stored before hatching experiments or for zooplankton translocation, desiccating sediments should be considered to enhance hatchling numbers.