Environmental Impact of Microplastics in Aquatic Ecosystems: A Review of Current Research and Future Directions

The worldwide problem of microplastics is a ubiquitous and persistent aquatic stressor that challenges the conventional paradigms of pollution. The complexity of microplastic pollution is far more complex than simple physical contamination, involving complex chemical, biological, and ecological processes. Microplastics are unique chemical substances, new microbial habitats, and co-contaminant vectors, thus affecting organisms from the cellular to the ecosystem level. This review article summarizes the most important scientific progress in understanding the environmental fate of microplastics, their role as the "plastisphere," and their ecotoxicological effects on biological scales. It critically evaluates the persistent uncertainties, such as the nature of trophic transfer and long-term ecosystem feedbacks. We discuss the new paradigms that conceptualize microplastics as dynamic ecological agents and explore the goals of developing standardized monitoring and sustainable remediation strategies. The novelty of this review article is in its integrative approach, combining polymer science, microbial ecology, ecotoxicology, and ecosystem biogeochemistry to offer a holistic perspective on one of the most challenging environmental issues of the Anthropocene era.