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Effects of nanopolystyrene on the feeding behavior of the blue mussel (Mytilus edulis L.)
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Researchers investigated how 30-nanometer polystyrene particles affect the feeding behavior of blue mussels. They found that exposure to nanoplastics caused mussels to produce pseudofeces, increase total waste output, and reduce filtering activity, indicating that nanoplastics disrupt normal feeding processes in these organisms.
As the industrial production of nanoplastic and the degradation of microplastic into smaller particles at sea increase, the potential amount of nanoplastics in the marine environment rises. It has been reported that mussels uptake 100-nm polystyrene (PS) beads; to date, however, the effects of this uptake on the organism are unknown. In the present study, the authors investigated the effects of 30-nm PS on the feeding behavior of the blue mussel (Mytilus edulis) by exposing the organism to different nano PS and different algae (Pavlova lutheri) concentrations. The state of nano PS aggregation in the exposure medium was assessed using dynamic light scattering. In all treatments that contained nano PS, M. edulis produced pseudofeces. The total weight of the feces and pseudofeces increased with increasing nano PS and increasing algae concentration. Furthermore, M. edulis reduced its filtering activity when nano PS was present but still caused a decrease in the apparent nano PS concentration in the water. The presence of nano PS around the foot of M. edulis after the bioassay confirmed that the organism removed nano PS from the water. Chronic effect studies are therefore needed to investigate the effects of nanoplastics in M. edulis and possible consequences for its predators, including humans.
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Blue mussel larvae were exposed to 100 nm and 2 μm polystyrene beads and microplastics were found to remain inside larvae despite active egestion, with growth unaffected but the proportion of abnormally developed larvae increasing at the highest polystyrene concentration (282 μg/L). The findings suggest that early developmental stages of mussels can be harmed by microplastic exposure at concentrations relevant to polluted coastal areas.
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Researchers exposed blue mussels to low-density polyethylene microplastics at different concentrations for up to 56 days and found particles in gills, intestinal lumens, and digestive tissues. Mussels also expelled plastic particles in their pseudofeces, demonstrating both uptake and a partial clearance mechanism for microplastic exposure in filter feeders.
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Researchers compared the toxic effects of micro-sized and nano-sized polystyrene particles on the gills of Mediterranean mussels. Both sizes caused oxidative damage, tissue alterations, and immune responses, but nanoplastics consistently produced more severe effects. The findings suggest that smaller plastic particles pose a greater threat to the gill function of filter-feeding shellfish, potentially impairing their ability to collect food and breathe.
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