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Effects of Polypropylene Microplastics on the Growth and Reproduction of Gammarus Aequicauda
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This study assessed the growth and reproductive effects of polypropylene microplastics -- the dominant environmental plastic type -- on the amphipod Gammarus aequicauda over multiple generations. Polypropylene microplastic exposure reduced survival, growth, and reproduction, establishing toxicity benchmarks for risk assessment of this prevalent polymer in marine environments.
The widespread contamination of the marine environments by plastics is emerged as a global concern due to their hazardous characteristics, making toxicity data necessary to assess the aquatic risk of this contaminant. Polypropylene (PP) microplastics (MPs) are the predominant environmental pollutants in the marine environment and their toxic effect on biota is scarce. The aim of this study was to detect sublethal ecotoxicological effects of PP MPs ($38-120\ \mu\mathrm{m}$) on growth and reproductive traits of the crustacean amphipod Gammarus aequicauda. Amphipods of 400 µm head length were exposed to 2 and 5 mg/L PP for 65 days. Growth of amphipods, expressed as head length and antennae segments number was negatively affected by PP and increases with increasing PP concentration. A negative impact on reproductive traits was also observed with an high percentage of aborts and a reduced number of newborns.
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Polylactic acid versus polypropylene microplastics: ecotoxicological effects on Gammarus aequicauda using a multi-level approach
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Researchers compared the ecotoxicological effects of bioplastic (polylactic acid) and fossil-based (polypropylene) microplastics on the amphipod Gammarus aequicauda over 60 days. Both types caused significant growth reduction by day 45, but polypropylene exposure led to lower survival rates and more pronounced reproductive impairment, while gene expression analysis showed both types induced similar stress responses over time.
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Researchers compared the chronic toxicity of conventional polypropylene (PP) and biodegradable polylactic acid (PLA) microplastics on the marine amphipod Gammarus aequicauda to assess whether bioplastics are a safer alternative. The study found that both polymer types caused harm to this crustacean, indicating biodegradable plastics are not necessarily benign once released into marine environments.
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Researchers tested whether polylactic acid (PLA) microplastics, often marketed as a biodegradable alternative to conventional plastics, are safe for marine life. Both short-term and long-term exposure to PLA microplastics harmed marine amphipods, causing mortality at high concentrations and reduced growth and reproduction at lower levels. This challenges the assumption that biodegradable plastics are harmless to the environment and suggests they may pose similar risks as conventional microplastics.
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Researchers exposed a marine amphipod species to polyethylene microplastics for 30 days and tracked the effects on survival, growth, and reproduction. They found that microplastics caused a 50% drop in fertility, tripled the time needed for mating behavior, and reduced newborn survival by 80%. The study demonstrates that even without causing direct mortality, microplastic exposure can severely disrupt the reproductive success and population health of marine organisms.
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