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Differential effects of pristine and aged polystyrene nanoplastics on the first molting process in Tachypleus tridentatus
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Scientists found that tiny plastic particles (nanoplastics) harm baby horseshoe crabs by disrupting their ability to molt, or shed their shells to grow, a critical step for survival. Surprisingly, "weathered" plastic particles (the kind that break down from sunlight exposure in real oceans) caused this harm through different, less-understood mechanisms than fresh plastic particles typically used in lab studies. This matters because most plastic pollution in the environment is aged, not fresh, meaning current safety testing may be underestimating real-world risks to marine life, and potentially to the seafood humans eat.
Nanoplastics (NPs) are pervasive marine pollutants, yet most ecotoxicological studies rely on pristine commercial particles, which fail to reflect their transformation in real-world environments and associated ecological risks. As a primitive arthropod, the Chinese horseshoe crab (Tachypleus tridentatus) undergoes its most delicate phase during the initial phase of growth. Here, we examined the impact of pristine versus aged polystyrene (PS) NPs exposure on the initial molting cycle of juvenile T. tridentatus. Aged PS-NPs were prepared using ultraviolet radiation and subsequently exposed to juvenile T. tridentatus at an environmentally informed concentration (100 μg/L) for 90 days. It was revealed by our findings that the molting process was significantly disrupted by exposure to PS-NPs, as evidenced by a reduced molting rate and a prolonged mean molting time. In the pristine PS-NP group, this disruption was accompanied by severe mitochondrial impairment, elevated reactive oxygen species (ROS), and reduced adenosine triphosphate (ATP). Notably, the aged PS-NP group, molting inhibition occurred without measurable ROS or ATP changes, suggesting distinct or additional mechanisms. Changes in the toxicity of aged PS-NPs are associated with alterations to their surface properties. These findings offer a valuable reference for ecotoxicological assessment of aged PS-NPs in horseshoe crabs.
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Effects of Pristine and UV-Aged Polystyrene Nanoplastics on Post-Molt Horseshoe Crabs Tachypleus tridentatus: Aging-Mediated Divergence in Biological Effects.
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Scientists found that tiny plastic particles (nanoplastics) affect young horseshoe crabs differently depending on whether the plastic has been broken down by sunlight, surprisingly, "fresh" plastic caused more stress to the crabs' bodies than sun-damaged plastic. This matters because horseshoe crabs are vital to coastal ecosystems and medical testing (their blood is used to check vaccine safety), and it shows that how plastics age in the environment changes their potential harm, a factor scientists need to consider when studying how microplastics might affect other species, including humans, through the food chain.
Age-Dependent Molecular Response Strategies to Microplastic Exposure in the Endangered Horseshoe Crab Tachypleus tridentatus
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Scientists found that young horseshoe crabs react more strongly and chaotically to microplastic pollution than older ones, with the youngest showing bigger disruptions to their metabolism and stress systems. This matters because it shows microplastics can hit developing animals harder than adults—a pattern worth considering for other species, including how early-life exposure to microplastics might affect human infants and children differently than adults.
Particle size influences physiological responses to chronic exposure to polyethylene particles in juvenile Atlantic horseshoe crabs (Limulus polyphemus).
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Baby horseshoe crabs exposed to tiny plastic particles for three weeks grew slower, especially when exposed to larger microplastic fragments, even though other health markers looked normal. This suggests microplastics can subtly stunt growth in young marine animals, a reminder that plastic pollution's impact on marine food chains, and potentially the seafood we eat, deserves continued attention.
Aged polystyrene nanoplastics and bisphenol A co-exposure impair mitochondrial respiration in juvenile horseshoe crab Tachypleus tridentatus
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Sunlight and weathering don't just break plastic into smaller pieces, they chemically change its surface in ways that make it more toxic, especially when mixed with BPA (a common chemical in plastics). In this study, "aged" plastic nanoparticles combined with BPA caused worse, longer-lasting cell damage in young horseshoe crabs than fresh plastic particles did, by disrupting the cells' energy-producing machinery (mitochondria). Since most plastic pollution studies use fresh, unweathered particles, this suggests real-world environmental plastics, the kind humans and wildlife actually encounter after
Polystyrene microplastics impede growth and induce behavioural toxicity in endangered juvenile horseshoe crabs (Tachypleus tridentatus)
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Researchers exposed juvenile horseshoe crabs (Tachypleus tridentatus), an endangered species, to polystyrene microplastics and found significant growth retardation and behavioral abnormalities, raising concern that microplastic pollution may be contributing to population declines in this already threatened species.
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