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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.
Microplastic pollution has become an emerging threat to marine biodiversity, yet the developmental-stage-specific responses of endangered marine species remain poorly understood. Tachypleus tridentatus, a threatened marine arthropod of high ecological and conservation value, is exposed to microplastics in coastal habitats. In this study, five-instar-old and six-instar-old juvenile T. tridentatus were exposed to polystyrene microplastics (PS-MPs) with a diameter of 6 μm at environmentally relevant concentrations (0, 102, 104 particles/L) for 21 days. Fluorescence imaging revealed the accumulation of PS-MPs within the intestinal tract, with distinct retention characteristics among developmental stages. Transcriptome analysis revealed significant differential gene expression after exposure, with affected pathways related to energy metabolism, immune regulation, stress response, signal transduction, and development. Younger juveniles exhibited stronger transcriptional disturbances in metabolic and stress-related pathways, whereas older juveniles showed more coordinated regulation of homeostatic and adaptive genes. These findings suggest that juvenile T. tridentatus employs age-dependent molecular response strategies when confronted with microplastic exposure, reflecting developmental differences in stress sensitivity and adaptive capacity. Our study provides new insights into the molecular mechanisms underlying microplastic responses in an endangered marine species and highlights the importance of incorporating developmental-stage variation into ecological risk assessments and conservation strategies for horseshoe crabs in polluted coastal ecosystems.
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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.
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.
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.
Microplastics disrupt energy metabolism and intestinal integrity in juvenile Chinese horseshoe crabs
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Scientists exposed young horseshoe crabs (an ancient marine species) to microplastics and found real damage: the plastic particles built up in their gills and gut, weakened digestion, thinned their intestinal walls, and messed up how they process fats and energy—and these problems didn't fully go away even after the plastic exposure stopped. This matters because it shows microplastics can cause lasting harm to marine life that filters or lives in polluted waters, a warning sign for the broader food chain and ecosystems humans depend on, including the seafood we eat.
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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