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<p>We investigated the effects of sediment compaction and ivermectin (IVM), both livestock-related disturbances, on hatching dynamics and diversity of dormant zooplankton. We hypothesized that sediment compaction, as a physical stressor, will primarily affect abundance metrics, while IVM concentration, as a chemical stressor, will selectively affect diversity. An ex-situ hatching experiment was conducted with six treatments: two levels of compaction (compacted and uncompacted sediment) and three levels of IVM concentration associated to cattle dung (0, 0.5, and 1.5 μg g⁻<sup>1</sup>). Zooplankton emergence from resting stages was monitored over 35 days. In total, 16 taxa were identified, with bdelloid rotifers consistently dominating. Zooplankton abundance declined with both stressors, more strongly with sediment compaction and to a lesser extent with IVM concentration. The proportion of Bdelloidea relative to total zooplankton increased with IVM, particularly in uncompacted sediments. Diversity metrics (S′, H′, and D′) decreased at higher IVM concentrations. IVM exposure altered community composition: Lecanid rotifers dominated the treatment without IVM, while <i>Ceriodaphnia cornuta</i> Sars, 1885 dominated in IVM-treated samples. These findings highlight the ecological risks that cattle-related disturbances pose to dormant zooplankton banks, with potential consequences for food web dynamics in affected ecosystems.</p>

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Constraints on dormant zooplankton emergence under cattle-related disturbances in aquatic sediments

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Daniel Nino Flores-Mendez,
  • Camila Jazmín Lorente,
  • Leticia Mesa,
  • María Victoria Miró,
  • Adrián Lifschitz,
  • María Florencia Gutierrez

摘要

We investigated the effects of sediment compaction and ivermectin (IVM), both livestock-related disturbances, on hatching dynamics and diversity of dormant zooplankton. We hypothesized that sediment compaction, as a physical stressor, will primarily affect abundance metrics, while IVM concentration, as a chemical stressor, will selectively affect diversity. An ex-situ hatching experiment was conducted with six treatments: two levels of compaction (compacted and uncompacted sediment) and three levels of IVM concentration associated to cattle dung (0, 0.5, and 1.5 μg g⁻1). Zooplankton emergence from resting stages was monitored over 35 days. In total, 16 taxa were identified, with bdelloid rotifers consistently dominating. Zooplankton abundance declined with both stressors, more strongly with sediment compaction and to a lesser extent with IVM concentration. The proportion of Bdelloidea relative to total zooplankton increased with IVM, particularly in uncompacted sediments. Diversity metrics (S′, H′, and D′) decreased at higher IVM concentrations. IVM exposure altered community composition: Lecanid rotifers dominated the treatment without IVM, while Ceriodaphnia cornuta Sars, 1885 dominated in IVM-treated samples. These findings highlight the ecological risks that cattle-related disturbances pose to dormant zooplankton banks, with potential consequences for food web dynamics in affected ecosystems.