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Understanding the Ecological Robustness and Adaptability of the Gut Microbiome in Plastic-Degrading Superworms (Zophobas atratus) in Response to Microplastics and Antibiotics
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Researchers studied superworms (Zophobas atratus larvae) that can eat and break down five major types of plastic, including polyethylene, polypropylene, and polystyrene. They found that the gut microbiome of these insects adapted to digest different plastics even when challenged with antibiotics, suggesting the larvae and their gut bacteria work together in a robust system that could inform future plastic biodegradation strategies.
Recent discoveries indicate that several insect larvae are capable of ingesting and biodegrading plastics rapidly and symbiotically, but the ecological adaptability of the larval gut microbiome to microplastics (MPs) remains unclear. Here, we described the gut microbiome assemblage and MP biodegradation of superworms (Zophobas atratus larvae) fed MPs of five major petroleum-based polymers (polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyethylene terephthalate) and antibiotics. The shift of molecular weight distribution, characteristic peaks of C═O, and metabolic intermediates of residual polymers in egested frass proved depolymerization and biodegradation of all MPs tested in the larval intestines, even under antibiotic suppression. Superworms showed a wide adaptation to the digestion of the five polymer MPs. Antibiotic suppression negatively influenced the survival rate and plastic depolymerization patterns. The larval gut microbiomes differed from those fed MPs and antibiotics, indicating that antibiotic supplementation substantially shaped the gut microbiome composition. The larval gut microbiomes fed MPs had higher network complexity and stability than those fed MPs and antibiotics, suggesting that the ecological robustness of the gut microbiomes ensured the functional adaptability of larvae to different MPs. In addition, Mantel’s test indicated that the gut microbiome assemblage was obviously related to the polymer type, the plastic degradability, antibiotic stress, and larval survival rate. This finding provided novel insights into the self-adaptation of the gut microbiome of superworms in response to different MPs.
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Researchers investigated how superworms (Zophobas morio) and their gut microbiome work together to break down polyethylene plastic, identifying key xenobiotic metabolism pathways and host-microbe interactions that drive biodegradation.
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Superworms (Zophobas morio larvae) can eat and break down foam plastic, but scientists worried the leftover plastic bits in their waste might still pollute the environment. This study found that when the larvae eat their own plastic-containing waste a second time, they break it down even further—and surprisingly, this second round causes less gut damage than eating fresh plastic did, thanks to helpful gut bacteria and protective molecules. This suggests a cheap, natural way to help tackle plastic waste, though more research is needed before this translates into real-world solutions for reducing microplastic pollution that ends up in our food and water.
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