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Nanoplastic-induced microbiome shifts reduce Daphnia fitness and increase parasite reproduction
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Researchers transplanted gut microbiomes from nanoplastic-exposed Daphnia magna into unexposed hosts and found that the nanoplastic-altered microbial communities persisted across the host lifespan, reducing host fecundity and elevating fungal parasite reproduction — revealing microbiome disruption as an indirect pathway through which nanoplastic pollution compromises host fitness.
Abstract Environmental pollutants can profoundly influence host-associated microbiomes, with cascading effects on host health and susceptibility to disease. Here, we investigated whether nanoplastic particles (NPs), a pervasive contaminant, influence host-parasite interaction by altering the microbiome of the water flea Daphnia magna. Microbiomes from NP-exposed and control Daphnia donors were transplanted to axenic Daphnia recipients, which were subsequently challenged with the fungal parasite Australozyma monospora sp. nov. Host and parasite fitness were then compared across treatments. NP exposure induced marked shifts in bacterial community structure and increased microbial diversity in donor microbiomes. These shifts persisted after transplantation, with recipient microbiomes remaining distinct from controls throughout the host lifespan, despite the absence of direct NP exposure. Microbiome shifts associated with NP exposure corresponded to elevated parasite reproduction and reduced host fecundity, while host survival was unaffected. Our findings demonstrate that NP pollution can indirectly compromise host health by reshaping microbial communities, highlighting microbiome-mediated pathways as important mechanisms through which emerging pollutants may shape ecological and evolutionary dynamics.
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Scientists exposed water fleas (Daphnia magna) to polystyrene nanoplastics of two sizes, with and without a yeast parasite infection, and analyzed changes in their gut and body microbiomes. The smallest nanoplastics at the highest concentration caused the most dramatic shifts in bacterial communities, with effects that exceeded those caused by the parasite alone. The results suggest that nanoplastic pollution could fundamentally reshape the beneficial microbes that aquatic organisms depend on for their health.
Nanoplastic-induced microbiome shifts reduce Daphnia fitness and increase parasite reproduction
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Scientists found that tiny plastic particles (called nanoplastics) can harm the gut bacteria of small water creatures called Daphnia, making them weaker and more likely to get sick from parasites. This matters because nanoplastics are everywhere in our environment - including our drinking water and food - and they might be disrupting the helpful bacteria in our own bodies too. The study suggests that plastic pollution could be weakening immune systems by damaging the good microbes that help protect us from disease.
Nanoplastic Exposure Impairs Host Fitness and Parasite Transmission With Transgenerational Maternal Reproductive Costs in the Daphnia-Fungal Parasite System.
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Researchers exposed water fleas (Daphnia magna) infected with a fungal parasite to nanoplastic particles in a lab test. Exposed fleas died sooner and reproduced less, and their offspring, though never directly exposed, also showed reduced and delayed reproduction, suggesting effects on survival and reproduction can carry over to the next generation.
Nanoplastic-induced microbiome shifts reduce Daphnia fitness and increase parasite reproduction
AI summary Read the abstract
Scientists found that tiny plastic particles (nanoplastics) changed the gut bacteria of water fleas, making them weaker and more vulnerable to parasites. This matters because humans also have important gut bacteria that help keep us healthy, and we're increasingly exposed to these same tiny plastics through food and water. The study suggests that nanoplastic pollution could potentially harm our beneficial gut bacteria and make us more susceptible to infections.
Nanoplastic exposure impairs host fitness and parasite transmission with transgenerational maternal reproductive costs in the Daphnia-fungal parasite system
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Scientists found that tiny plastic particles (nanoplastics) harmed water fleas—a small aquatic creature—by making them less healthy and even affecting their offspring's ability to reproduce, all while also changing how a fungal parasite spread through the population. While this study was done in a lab animal, not humans, it adds to growing evidence that nanoplastics can disrupt biological systems across generations, which matters given how widespread plastic pollution has become in our water, food, and environment.
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