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Peer Review #2 of "Virgin and UV-weathered polyamide microplastics posed no effect on the survival and reproduction of Daphnia magna (v0.1)"
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This peer review assesses a study testing the effects of virgin and UV-weathered polyamide microplastics on Daphnia magna reproduction under the 21-day OECD 211 guideline at 100 and 300 mg/L concentrations. The reviewer evaluates the finding that neither particle type affected D. magna survival or reproduction, highlighting the need for additional endpoints to detect potential long-term impacts of insoluble plastic particles.
Although evidence suggests that microplastic (MP) particles pose a risk to organisms, the effects of virgin and weathered MP should be evaluated separately as their effects may be different.In this work, we provide new information on the toxic potential of virgin and UV-weathered polyamide, one of the commonly used plastics worldwide.Polyamide MP particles were subjected to UV-weathering in wet conditions during 26 days in a customized irradiation chamber equipped with UV-C light tubes (15 W each, max.wavelength 254 nm).The toxicity of virgin and UV-weathered polyamide MP (<180 μm in one dimension, 100 and 300 mg L -1) was evaluated by studying Daphnia magna reproduction in natural lake water spiked with MP, following the 21-day OECD 211 test guideline.In parallel, a nonionic surfactant Tween 20 (7 mg L -1) was added to the test medium to improve the suspendability of the MP.The results of the tests showed no adverse effects of either virgin or UV-weathered polyamide MP on the reproduction of D. magna.In addition, presence of Tween 20 in the test medium had no effects on the test results.These results bring a new perspective on the potential long-term impact of polyamide particles on aquatic organisms, especially considering that the polyamide has received marginal attention in the ecotoxicological research.However, standard test endpoints (survival and reproduction) may still miss long-term adverse effects of insoluble e.g., plastic particles and additional studies may be necessary.
More Papers Like This
Peer Review #1 of "Virgin and UV-weathered polyamide microplastics posed no effect on the survival and reproduction of Daphnia magna (v0.1)"
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Researchers evaluated the toxicity of virgin and UV-weathered polyamide microplastics on Daphnia magna reproduction using the 21-day OECD 211 test guideline at concentrations of 100 and 300 mg/L in natural lake water. Neither virgin nor UV-weathered polyamide microplastics caused adverse effects on D. magna survival or reproduction, though the authors note standard endpoints may miss long-term effects of plastic particles.
Virgin and UV-weathered polyamide microplastics posed no effect on the survival and reproduction of Daphnia magna
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Researchers found that neither virgin nor UV-weathered polyamide microplastics affected the survival or reproduction of Daphnia magna, suggesting this polymer type poses limited acute toxicity to freshwater zooplankton under tested conditions.
Effects of chronic exposure to environmentally realistic microplastics on Daphnia magna: importance of particle size and morphology and implications for risk assessments
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Scientists tested how tiny plastic particles from everyday items like nylon fibers and polystyrene cups affect small water creatures called Daphnia over 21 days. They found that these microplastics get eaten by the creatures and can harm their ability to reproduce and grow, especially the fiber-shaped plastics. This matters because it shows how plastic pollution in water can damage aquatic life, and since microplastics are also found in our drinking water and food, understanding these effects helps us better assess potential risks to human health.
Long Term Exposure to Virgin and Recycled LDPE Microplastics Induced Minor Effects in the Freshwater and Terrestrial Crustaceans Daphnia magna and Porcellio scaber
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Long-term exposure studies of freshwater and terrestrial crustaceans to virgin and recycled LDPE microplastics found only minor effects on survival, reproduction, and immune response, suggesting that LDPE at tested concentrations poses limited chronic hazard to these species.
Review on the ecotoxicological impacts of plastic pollution on the freshwater invertebrate Daphnia
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This review examines the ecotoxicological impacts of plastic pollution on the freshwater invertebrate Daphnia, a widely used model organism. Researchers highlight that microplastics affect Daphnia reproduction, growth, and survival, and that chemicals leaching from plastics may contribute additional toxic effects that transfer through food webs.
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