Section for Terrestrial Ecology, Department of Ecoscience, Aarhus University, Aarhus C, Denmark.
Section for the Environment & Health, Amsterdam Institute for Life and Environment, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
Environ Toxicol Chem. 2024 May;43(5):1173-1183. doi: 10.1002/etc.5850. Epub 2024 Mar 28.
Current standard toxicity tests on nontarget soil invertebrates mainly focus on the endpoints survival and reproduction. Such results are likely insufficient to predict effects at higher organizational levels, for example, the population level. We assessed the effects of exposure to the pesticide teflubenzuron on the collembolan Folsomia candida, by performing a full life-cycle experiment exposing single individuals via contaminated food (uncontaminated control and 0.2, 0.32, 0.48, 0.72, 1.08, and 1.6 mg/kg dry yeast). Several life-history traits were considered by following the growth and development of newly hatched individuals over a period of 65 days. We assessed survival, body length, time to first oviposition, cumulative egg production, and hatchability of eggs. A two-stage model was applied to calculate the population growth rate (λ) combined with elasticity analysis to reveal the relative sensitivity of λ to the effects of teflubenzuron on each life-history parameter. Body length was the least sensitive life-history parameter (median effective concentration = 1.10 mg teflubenzuron/kg dry yeast) followed by time to first oviposition (0.96 mg/kg), survival (median lethal concentration = 0.87 mg/kg), cumulative egg production (0.32 mg/kg), and egg hatchability (0.27 mg/kg). Population growth decreased with increasing concentrations of teflubenzuron (λ = 1.162/day in control to 1.005/day in 0.72 mg/kg dry yeast, with populations going extinct at 1.08 and 1.6 mg/kg dry yeast). Elasticity analysis showed that changes in juvenile survival had a greater impact on the population growth rate compared with the other life-history traits. Our study provides a comprehensive overview of individual-level effects of long-term exposure to teflubenzuron and integrates these effects to assess the potential risk to collembolan populations. Environ Toxicol Chem 2024;43:1173-1183. © 2024 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
目前针对非靶标土壤无脊椎动物的毒性测试主要集中在生存和繁殖等终点上。然而，这些结果可能不足以预测更高组织层次的效应，例如种群水平。我们通过对 Folsomia candida 个体进行经污染食物（未污染对照和 0.2、0.32、0.48、0.72、1.08 和 1.6mg/kg 干酵母）暴露的全生活史实验，评估了杀虫剂氟虫脲对其的影响。在 65 天的时间里，我们跟踪刚孵化个体的生长和发育，以评估多个生活史特征。我们评估了存活率、体长、首次产卵时间、累积产卵量和卵孵化率。应用两阶段模型计算种群增长率（λ），并结合弹性分析，揭示 λ 对氟虫脲对每个生活史参数的相对敏感性。体长是最不敏感的生活史参数（中浓度效应值=1.10mg 氟虫脲/kg 干酵母），其次是首次产卵时间（0.96mg/kg）、存活率（中致死浓度=0.87mg/kg）、累积产卵量（0.32mg/kg）和卵孵化率（0.27mg/kg）。随着氟虫脲浓度的增加，种群增长率下降（对照中 λ=1.162/天，而 0.72mg/kg 干酵母中 λ=1.005/天，在 1.08 和 1.6mg/kg 干酵母中种群灭绝）。弹性分析表明，与其他生活史特征相比，幼体存活率的变化对种群增长率的影响更大。我们的研究提供了长期暴露于氟虫脲对个体水平影响的综合概述，并将这些影响整合起来评估对跳虫种群的潜在风险。环境毒理化学 2024；43：1173-1183。
