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Ecotoxicological Effects of Microplastics on Bird Embryo Development by Hatching without Eggshell
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Microplastics added to bird eggs during development caused abnormalities and reduced hatching success in an eggshell-free incubation model. The findings suggest that microplastics can disrupt avian embryo development, with implications for wildlife populations in contaminated environments.
Microplastics are an emerging global pollutant type that poses a great health threat to animals due to their uptake and translocation in animal tissues and organs. Ecotoxicological effects of microplastics on the development of bird embryos are not known. The bird egg is a complete development and nutrition system, and the entire embryo development occurs in the eggshell. Therefore, a direct record of bird embryo development under the stress of pollutants such as microplastics is highly limited by the opaque eggshell in traditional hatching. In this study, the effects of microplastics on quail embryo development were visually monitored by hatching without an eggshell. The main steps include the cleaning and disinfection of fertilized eggs, the incubation before exposure, the short-term incubation after exposure, and the sample extraction. The results show that compared with the control group, the wet weight and body length of the microplastics-exposed group displayed a statistical difference and the liver proportion of the whole exposed group significantly increased. Additionally, we evaluated external factors that affect the incubation: temperature, humidity, egg rotation angle, and other conditions. This experimental method provides valuable information on the ecotoxicology of microplastics and a novel way to study the adverse effects of pollutants on the development of embryos.
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Ecotoxicological Effects of Microplastics on Bird Embryo Development by Hatching without Eggshell
AI summary Read the abstract
Researchers used an eggshell-free hatching model to visually monitor quail embryo development under microplastic exposure, finding that microplastics caused measurable ecotoxicological effects on bird embryo development including developmental delays and morphological abnormalities.
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Researchers detected microplastics in all commercial chicken eggs tested (average 17 μg/g), confirmed maternal transfer by finding polystyrene and polyethylene in all ovarian follicles, and showed that injecting polystyrene nanoplastics into yolk sacs disrupted yolk sac function and intestinal development in chicks.
Oliverben5672/Microplastics-Reduce-Hatching-Success-A-Meta-Analysis: Initial data and code release
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A large review of existing studies found that microplastics (tiny plastic particles smaller than a grain of rice) make it harder for animal eggs to successfully hatch. While this research looked at fish, birds, and other egg-laying animals rather than humans, it adds to growing evidence that plastic pollution can interfere with reproduction—a concern scientists are now investigating in people too, since we're all exposed to microplastics through food, water, and air.
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Researchers reviewed how microplastic pollution affects terrestrial birds — key ecological indicators — finding documented harms including intestinal blockage and developmental disruption, with implications for entire food webs since birds that ingest plastics can concentrate and transfer contamination to other species, including humans.
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Researchers fed polystyrene microplastics to quails and tracked fecal excretion over time, finding that 90% of parent particles were expelled within 10 days but that smaller fragmented microplastics persisted up to 20 days — and that digestion caused significant oxidation and fragmentation of the particles.
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