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Warming temperatures exacerbate effects of microplastics in a widespread zooplankton species.
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This study found that warmer water temperatures made microplastics significantly more harmful to Daphnia (water fleas), reducing their survival and reproduction at 20 and 24 degrees Celsius but not at 12 degrees. The combination of warming temperatures and microplastic pollution was worse than either stressor alone. As climate change warms lakes and rivers, this research suggests that the toxic effects of microplastic pollution on aquatic ecosystems, and the food chains humans depend on, may get worse.
The emergence of microplastics as a global contaminant of concern has coincided with climate change induced temperature warming in aquatic ecosystems. Warmer temperatures have been previously demonstrated to increase the toxicity of certain contaminants, but it is currently unclear if microplastics are similarly affected by temperature. As aquatic organisms simultaneously face microplastic pollution and both increasing and variable temperatures, understanding how temperature affects microplastic toxicity is pertinent in this era of human-induced global change. In this study, we investigate the effects of environmentally relevant microplastic exposure to Daphnia pulex survival, reproduction, and growth at three different temperatures. To simulate an environmentally relevant exposure scenario, we created microplastics with physicochemical characteristics often detected in nature, and exposed organisms to concentrations close to values reported in inland waters and 1-2 orders of magnitude higher. The three temperatures tested in this experiment included 12 °C, 20 °C, and 24 °C, to simulate cool/springtime, current, and warming scenarios. We found the highest concentration of microplastics significantly impacted survival and total offspring compared to the control at 20 °C and 24 °C, but not at 12 °C. The adverse effect of high microplastic concentrations on total offspring at warmer temperatures was driven by the high mortality of the juveniles. We observed no effect of microplastics on time to first reproduction or average growth rate at any temperature. Warmer temperatures exacerbated microplastic toxicity, although only for concentrations of microplastics not currently observed in nature, but these concentrations are possible in pollution hotspots, through pulses pollution events or future worsening environmental contamination. The results of our study illustrate the continued need to further investigate climate change related co-stressors such as warming temperatures in microplastic and pollution ecology, through environmentally realistic exposure scenarios.
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Researchers found that temperature plays a key role in how toxic microplastics are to the water flea Daphnia magna. Microplastic exposure caused increased mortality, reduced reproduction, and slower population growth, with these negative effects becoming much more pronounced at higher temperatures. The study suggests that warming water temperatures due to climate change may amplify the harmful impacts of microplastic pollution on aquatic ecosystems.
Long-term adverse effects of microplastics on Daphnia magna reproduction and population growth rate at increased water temperature and light intensity: Combined effects of stressors and interactions
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Researchers investigated how increased water temperature and light intensity affect the long-term toxicity of microplastics to the water flea Daphnia magna. They found that microplastics caused mortality, reduced growth, and decreased reproduction across all conditions, but these effects were significantly worsened by both higher temperature and brighter light. The study suggests that climate change factors may synergistically amplify the harmful impacts of microplastic pollution on freshwater zooplankton.
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Researchers found that polyethylene microplastic fragments were over 70 times more toxic to water fleas than spherical microplastic beads of similar size, and that elevated water temperatures made the toxicity even worse. At 25 degrees Celsius compared to 20 degrees, the lethal effects of the fragments increased substantially, and the organisms also showed greater reproductive impairment. The study demonstrates that both the shape of microplastics and rising temperatures due to climate change can dramatically amplify their harmful effects on freshwater organisms.
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This study found that polystyrene nanoplastics became more toxic to water fleas (Daphnia magna) at higher temperatures, causing more oxidative stress and a greater drop in reproduction. Warmer conditions increased how much plastic the organisms absorbed and accumulated. The findings suggest that as global temperatures rise, the harmful effects of nanoplastic pollution on aquatic life could get worse, potentially affecting species that are important food sources for fish.
Meta-analysis reveals temperature increase exacerbates microplastic toxicity in freshwater invertebrates
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This meta-analysis pools data from multiple studies to show that rising temperatures make microplastics more toxic to freshwater invertebrates. The combined stress of warming water and plastic pollution caused greater harm to growth, reproduction, and survival than either stressor alone, suggesting that climate change will worsen the ecological and health impacts of microplastic contamination.
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