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Biological Responses to Climate Change and Nanoplastics Are Altered in Concert: Full-Factor Screening Reveals Effects of Multiple Stressors on Primary Producers
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Using high-throughput screening of a freshwater green alga, researchers tested how nanoplastics interact with multiple climate change stressors (temperature, CO2, pH, UV), finding that nanoplastics combined with warming or UV caused greater harm than either alone, and that climate change will likely amplify nanoplastic toxicity.
While the combined presence of global climate change and nanosized plastic particle (i.e., nanoplastic) pollution is clear, the potential for interactions between climate-change-shifting environmental parameters and nanoplastics is largely unknown. Here, we aim to understand how nanoplastics will affect species in concert with climate change in freshwater ecosystems. We utilized a high-throughput full-factorial experimental system and the model photosynthetic microorganism Scenedesmus obliquus to capture the complexity of interacting environmental stressors, including CO2, temperature, light, and nanoplastics. Under a massive number of conditions (2000+), we consistently found concentration-dependent inhibition of algal growth in the presence of polystyrene nanoparticles, highlighting a threat to primary productivity in aquatic ecosystems. Our high-treatment experiment also identified crucial interactions between nanoplastics and climate change. We found that relatively low temperature and ambient CO2 exacerbated damage induced by nanoplastics, while elevated CO2 and warmer temperatures reflecting climate change scenarios somewhat attenuated nanoplastic toxicity. Further, we revealed that nanoplastics may modulate light responses, implying that risks of nanoplastic pollution may also depend on local irradiation conditions. Our study highlights the coupled impacts of nanoplastics and climate change, as well as the value of full-factorial screening in predicting biological responses to multifaceted global change.
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Altered Biological Responses of Primary Producers to Multiple Stressors in the Presence of Nanoplastics
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This thesis investigated how nanoplastics interact with other environmental stressors — including elevated CO2, temperature, and light — to affect freshwater algae and cyanobacteria. The results show that nanoplastics can alter how aquatic plants respond to climate change, potentially disrupting the base of freshwater food webs.
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Researchers reviewed nanoplastic ecotoxicity in freshwater organisms under realistic co-exposure scenarios with metals, pesticides, and climate change stressors, finding that synergistic toxicity was especially common — often driven by nanoplastics acting as Trojan horse vectors — and that rising temperatures generally amplified nanoplastic harm across fish and invertebrate taxa.
Dual impacts of elevated pCO2 on the ecological effects induced by microplastics and nanoplastics: A study with Chlamydomonas reinhardtii
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Researchers examined how freshwater acidification from elevated carbon dioxide interacts with polystyrene micro- and nanoplastics to affect a common green algae species. They found that smaller nanoplastics caused greater harm than larger microplastics, primarily through oxidative stress, while acidification alone actually promoted algal growth. The study reveals that climate change and plastic pollution can interact in unexpected ways, with acidification sometimes masking or modifying the toxic effects of plastic particles.
Micro- and nanoplastics effects in a multiple stressed marine environment
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Researchers examined how micro- and nanoplastics interact with other environmental stressors in marine settings, finding that realistic multi-stressor scenarios can amplify or modify plastic toxicity in ways single-exposure studies miss.
Molecular mechanism for combined toxicity of micro(nano)plastics and carbon nanofibers to freshwater microalgae Chlorella pyrenoidosa
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Researchers tested how microplastics, nanoplastics, and carbon nanofibers affect freshwater algae individually and in combination, finding that the combined effects were significantly worse than either pollutant alone. Nanoplastics combined with carbon nanofibers caused the most severe cellular stress, damaging cell membranes, increasing oxidative stress, and disrupting energy metabolism. Since algae form the base of aquatic food chains, this damage could cascade through ecosystems and affect the safety of water and seafood for humans.
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