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Uptake of polystyrene microplastics by marine rotifers under different experimental conditions
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Researchers examined polystyrene microplastic uptake by marine rotifers (Brachionus plicatilis), finding ingestion positively correlated with microplastic concentration and peaked at 24 hours before declining, with container type also influencing ingestion rates.
Abstract Marine microplastic pollution has become one of the global problems due to the adverse effects of microplastics on marine organisms. This study investigated the uptake of (Polystyrene, PS) microplastics by marine rotifers ( Brachionus plicatilis ) under different microplastic concentration, exposure time and type of containers. The results showed that the ingestion of microplastics by rotifers was positively correlated with microplastic concentration. The intake reached maximum (65±5 particles/individuals, 5 mg/L; 28±11 particles/individuals, 3 mg/L) at 24 h, and then decreased over time. Moreover, the intake of microplastics in the plastic well plates was much lower than that in the glass vial. This study demonstrated that the intake of microplastics by rotifers varied with microplastics concentration and exposure time. More importantly, microplastics-related experiments using plastic containers could influence the uptake results. This work provides useful information on the interaction of microplastics with marine organisms.
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The Effect of Polystyrene (Ps) Microplastic Exposure with Different Doses on the Growth and Survival of Rotifera (Brachionus sp.)
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This study tested how polystyrene microplastics at different doses affect the growth and survival of tiny aquatic organisms called rotifers. The results showed harmful effects at higher doses, demonstrating that microplastics can disrupt organisms at the base of the food chain, which can have ripple effects up to the seafood humans eat.
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Researchers studied the uptake, elimination, and intestinal effects of polystyrene microplastics on brine shrimp larvae. They found that the larvae ingested microplastics at rates dependent on concentration, exposure time, and food availability, and that the particles caused intestinal damage. The study demonstrates that microplastic contamination can harm the health and feeding behavior of zooplankton larvae, which are critical components of marine food webs.
Influence of polystyrene microplastics on rotifer (Brachionus calyciflorus) growth, reproduction, and antioxidant responses
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Polystyrene microplastics trigger oxidative stress in the freshwater rotifer Brachionus calyciflorus, increasing reactive oxygen species while impairing growth, reproduction, and the antioxidant enzyme PHGPx in a concentration-dependent manner. These findings demonstrate that microplastics can disrupt the antioxidant defense systems of small aquatic invertebrates, with implications for food web stability in contaminated freshwater ecosystems.
A marine Plankton-Plastic Predation Loop: selective grazing, excretion and reingestion of microplastics by the rotifer Brachionus plicatilis
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Researchers found that the rotifer Brachionus plicatilis preferentially grazes phytoplankton over similarly sized polyethylene microplastic beads but still ingests microplastics — including previously excreted particles — proposing a 'Plankton-Plastic Predation Loop' where the same particles are repeatedly ingested and could continually disrupt marine food webs.
Feeding type and development drive the ingestion of microplastics by freshwater invertebrates
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Researchers exposed freshwater invertebrates with different feeding strategies to fluorescent polystyrene microplastics of various sizes and found that all species ingested particles in a concentration-dependent manner. Filter feeders like Daphnia magna consumed the most particles, while feeding type and developmental stage strongly influenced ingestion rates. The study suggests that feeding strategy is a key predictor of microplastic uptake in freshwater food webs, and that younger organisms may be more vulnerable.
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