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Effects of Microplastics on Reproductive Characteristics and Mechanisms of the Marine Rotifer Brachionus plicatilis
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Researchers exposed the marine rotifer Brachionus plicatilis to polystyrene microspheres across multiple sizes and concentrations for 20 days, finding that near-nanometer particles at high concentrations severely impaired body size, maturity timing, reproduction, and survival, reducing net reproductive yield to one-third of controls.
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A multigenerational toxicity study with the marine amphipod Monocorophium uenoi found that chronic exposure to PET microplastics reduced first-generation offspring production to 55% of controls, with complete reproductive suppression in the second generation confirmed by Raman spectroscopy detection of particles in tissues. This demonstrates that sediment-associated microplastics can cause escalating, transgenerational reproductive failure in marine invertebrates—a stark warning for the long-term health of benthic ecosystems.
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