淡水系统中微塑料的存在会对食物链产生有害影响。浮游动物,特别是悬浮液和过滤给料机,可以摄取微塑料,这会造成不良影响,并将其转移到更高的营养水平。这里,我们分析存在,丰度,以及微塑料在地表水中的分布,浮游动物,在墨西哥中部的两个热带湖泊里钓鱼.我们在每个湖泊的三个地点和Chirostoma属的120条鱼收集了一式三份的水样。从每个水样中,随机分离并独立加工300只轮虫和150只微甲壳类动物。在水中发现的颗粒中,浮游动物,和来自两个湖泊的鱼,碎片是主要的碎片。两个湖泊的水柱中微塑料的总丰度在1.2至17.0项L-1之间变化。在浮游动物中,发现的碎片主要含有多达0.1项ind-1,而在鱼类中,记录了多达4.5项ind-1。我们的结果证实了淡水体食物网的不同隔室中存在微塑料,水柱,浮游动物,和鱼。需要进一步研究这些压力源在不同营养水平上的可能影响。
The presence of microplastics in freshwater systems can have harmful effects on the food chain. Zooplankton, especially suspension and filter feeders, can ingest microplastics, which can cause adverse effects and transfer them to higher trophic levels. Here, we analyze the presence, abundance, and distribution of microplastics in surface water, zooplankton, and fish in two tropical lakes in central Mexico. We collected water samples in triplicate at three sites in each lake and 120 fish of the genus Chirostoma. From each water sample, 300 rotifers and 150 microcrustaceans were randomly isolated and processed independently. Of the particles found in the water, zooplankton, and fish from both lakes, the fragments were the predominant ones. The total abundance of microplastics in the water column of both lakes varied between 1.2 and 17.0 items L-1. In zooplankton, fragments were found predominantly with up to 0.1 items ind-1, while in fish, up to 4.5 items ind-1 was recorded. Our results confirm the presence of microplastics in different compartments of the food webs of freshwater bodies, water column, zooplankton, and fish. Further work is required on the possible effects of these stressors at the different trophic levels.