![]() Sediment reworking by a polychaete, Perinereis aibuhitensis, in the intertidal sediments of the Gomso Bay, Koreaīioturbation, especially sediment reworking by the activities of macroinvertebrates, such as feeding and burrowing, is one of the major processes that affect the physical, chemical, and biological characteristics of marine sediments. This observed difference suggests microplastic impact could be affected by physical properties, e.g., sinking speed, surface area available for sorption of chemicals and bacteria, and selective feeding behaviors of the target organism. The impact of the micro-polystyrene beads was size-dependent with smaller beads (8-12μm in diameter) being more detrimental than those bigger in size (32-38μm). Focusing on a commercially important polychaete, Perinereis aibuhitensis, we demonstrated that presence of microplastics increased mortality and reduced the rate of posterior segment regeneration. Microplastics are found in abundance in and on coastal sediments, and yet, whether exposure to this emerging pollutant negatively impact whole organism function is unknown. Microplastics reduced posterior segment regeneration rate of the polychaete Perinereis aibuhitensis. These results demonstrate that sublethal concentrations of BP negatively affect reproductive performance of the sandworm P. ![]() ![]() A higher concentration of BP (25 μg/L) caused more serious effects sexual maturation, fertilization success, and hatching decreased by 31%, 17% and 46%, respectively, and the sex ratio (female: male) and VTG mRNA gene expression level increased by 54% and 7.1-fold, respectively. A low concentration of BP (2.5 μg/L) had no effects on the rate of sexual maturation, spawning, or fertilization but significantly increased the sex ratio (female: male) from 1.6Â☐.15:1 to 2.3Â☐.18:1, inhibited hatching rate by 27%, and significantly increased VTG mRNA expression level by 3.7-fold following a 60-day exposure, compared with those in the solvent controls. To test the reproductive toxicity of BP on polychaetes, Perinereis nuntia was exposed to BP-contaminated artificial seawater and sexual maturation, the sex ratio, number of eggs spawned, fertilization and hatching rated, as well as vitellogenin (VTG) mRNA expression levels were analyzed. Wu, Qingyang Wang, Shuqi Chen, Xiaopeng Li, Pingīenzopyrene (BP) is an increasingly present marine environmental pollutant, yet our understanding of the long-term consequences of reproductive toxicity in marine benthic polychaetes remains limited. Reproductive toxicity assessment of benzopyrene in the marine polychaete Perinereis nuntia
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