Microplastics (MPs) are becoming increasingly common in freshwater ecosystems. Rotifers may involuntarily ingest MPs through non-selective filtration, thus causing non-real satiety, leading to adverse effects on their demography. Here, we evaluated the acute and chronic effects of MPs (30 µm) on two successive generations of s.s. at 20 and 25 °C. Demographic variables and ingestion rates were compared in the absence and presence of microplastics (550 spheres mL). For the life table experiments, cohorts of twenty neonates were introduced into 20 mL medium with four replicates per treatment. Ingestion rates of the rotifer were tested at both test temperatures in the absence and presence of the microplastics in 20 mL containers with 1 ind. mL per container. The rotifer population growth rates ranged from 0.55 to 1.05 d depending on the treatment. MPs decreased the fecundity by 20–24 %. The average lifespan of rotifers exposed to MPs in the F generation was lower than that in the F generation at both temperatures, indicating that pre-exposure of mothers may offer some protection to the offspring. The population growth rate was higher at 25 °C. The ingestion rates were significantly lower in the presence of the microplastics. Our observations indicated that this strain of was better adapted to 20 °C; microplastics and higher test temperature resulted in a pronounced changes in the demographic variables of the rotifer.

中文翻译：

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微塑料对萼花臂尾轮虫（轮虫）历代种群数量的影响


微塑料 (MP) 在淡水生态系统中变得越来越普遍。轮虫可能会通过非选择性过滤不自觉地摄入MP，从而引起非真正的饱腹感，从而对其种群造成不利影响。在这里，我们评估了 MP (30 µm) 在 20 和 25 °C 下对连续两代 ss 的急性和慢性影响。比较了不存在和存在微塑料（550 球/毫升）的情况下的人口统计变量和摄入率。对于生命表实验，将 20 名新生儿放入 20 mL 培养基中，每次处理重复四次。在具有 1 个 ind 的 20 mL 容器中不存在和存在微塑料的情况下，在两个测试温度下测试了轮虫的摄入率。每个容器毫升。根据处理的不同，轮虫种群增长率在 0.55 至 1.05 天之间。 MP 使生育力降低 20-24%。在两种温度下，暴露于 MP 的 F 代轮虫的平均寿命均低于 F 代，表明母亲的预先暴露可能会对后代提供一定的保护。 25℃时种群增长率较高。在存在微塑料的情况下，摄入率显着降低。我们的观察表明，该菌株更能适应20°C；微塑料和较高的测试温度导致轮虫的人口统计变量发生显着变化。