Reduced genetic diversity of freshwater amphipods in rivers with increased levels of anthropogenic organic micropollutants

Anthropogenic chemicals in freshwater environments contribute majorly to ecosystem degradation and biodiversity decline. In particular, anthropogenic organic micropollutants (AOM), a diverse group of compounds including pesticides, pharmaceuticals, and industrial chemicals, can significantly impact freshwater organisms. AOM were found to impact the genetic diversity of freshwater species, however, the degree to which AOM cause changes in population genetic structure and allelic richness of freshwater macroinvertebrates remains poorly understood. Here, the impact of AOM on the genetic diversity of the common amphipod Gammarus pulex (Linnaeus, 1758) (clade E) was investigated on a regional scale. The site-specific AOM levels and their toxic potentials were determined in water and G. pulex tissue sample extracts for 34 sites along six rivers impacted by wastewater effluents and agricultural run-off in central Germany. Population genetic parameters were determined for G. pulex from the samp...淡水环境中的人为源化学物质是引发生态系统退化与生物多样性下降的关键因素。其中，人为源有机微污染物（anthropogenic organic micropollutants, AOM）是一类涵盖农药、药物及工业化学品的多样化化合物，可对淡水生物造成显著影响。已有研究证实AOM会影响淡水物种的遗传多样性，但目前关于AOM对淡水大型无脊椎动物的种群遗传结构与等位基因丰富度产生改变的程度，仍缺乏深入认知。本研究在区域尺度下，探究了AOM对常见端足类钩虾（Gammarus pulex，Linnaeus, 1758）（进化枝E）遗传多样性的影响。针对德国中部受污水尾水排放与农业径流影响的六条河流沿岸的34个采样点，研究人员对水体及钩虾组织样品提取物中的位点特异性AOM水平及其毒性潜力进行了测定，并对采样所得钩虾的种群遗传参数进行了测定。