Life-stage dependent responses to microplastics and 2-methoxy-1,4-naphthoquinone in Daphnia magna

Multiple stressors threaten freshwater ecosystems, including microplastic pollution and invasive species. The invasive Himalayan balsam, Impatiens glandulifera , releases allelochemicals, such as 2-methoxy-1,4-naphthoquinone (2-MNQ), that can enter aquatic systems via runoff. While microplastics affect aquatic organisms and can alter the fate of chemical stressors, their interaction with plant-derived allelochemicals remains largely unexplored. Using Daphnia magna , we investigated the single and combined effects of well-characterized microplastic fragments (PA 66 and PS; 500 and 1000 particles/mL) and 2-MNQ (0.75 mg/L) under chronic exposure, with kaolinite as a natural particle control. Ultraviolet–visible spectroscopy indicated that 2-MNQ concentrations declined over time in particle-free conditions, whereas particle presence influenced the detectable dissolved fraction. Biological responses differed across life stages. At primiparity, microplastic exposure reduced body length, whereas 2-MNQ and co-exposure showed no significant effects. In contrast, after 21 days, co-exposure to 2-MNQ and microplastics reduced body length, and co-exposure to PA 66 and 2-MNQ additionally decreased reproduction, whereas microplastic-only effects were no longer evident. These findings demonstrate that the effects of microplastics and 2-MNQ are not static but shift over time, with particle-driven effects dominating early responses and combined effects becoming more relevant during prolonged exposure, potentially affecting long-term population dynamics.