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Tidal Rhythm Regulates the Adverse Outcome Pathways of Microplastics on Coastal Microbial Mat Multifunctionality
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Scientists found that microplastics—both regular plastic (PE) and "biodegradable" plastic (PLA)—harm the communities of microbes living in coastal sediment that help filter water and cycle nutrients, and tidal patterns actually make the damage worse rather than washing it away. Surprisingly, the "eco-friendly" PLA plastic disrupted these microbial communities just as much or more than regular plastic, disabling enzymes that break down waste and protect against cell damage. Since these coastal microbial mats help keep ocean ecosystems (and the seafood we eat) healthy, this research suggests biod
Coastal microplastic pollution is seeing increased concerns, yet the multifunctional response of microbial mats at the sediment-seawater-atmosphere multiphase interface to various microplastics remains poorly understood, especially incorporating long-term tidal regimes. This study utilized a simulation platform coupling 180 tidal cycles to investigate differential impacts of nondegradable (polyethylene, PE) and degradable (polylactic acid, PLA) microplastics on coastal microbial mats. PE at 50 mg/kg impaired microbial mat species richness and evenness, significantly inhibiting nitrate reductase (-37.5%) and urease (-31.7%) activities by remolding protein conformation compactness and inducing molecular aggregation. Tidal fluctuations enriched metabolic signatures associated with signal transduction and sulfur metabolism, potentially compensating for disorders in environmental perception, energy supply, and nitrogen transformation of mat microbiota upon PE exposure. Unlike PE, PLA disabled phosphatase (17.7-23.0%) and catalase (15.0-18.5%) activities in a dose-dependent manner through directly binding to molecular active sites. Tidal rhythms promoted PLA-mediated microbe migration (contribution rate >73%) and niche narrowing (specialists +10.2%). By unbiasedly reprogramming metabolic strategy toward amino acid biosynthesis as an alternative energy pathway, while disturbing organic phosphorus mineralization (-43.2%) and redox homeostasis (-19.4%), tidal fluctuations ultimately exacerbated multifunctionality compromise in PLA-exposed microbial mats. Our findings highlight the need to consistently incorporate dynamic environmental contexts when assessing coastal microplastic ecological risks.
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Researchers tested how five different types of microplastics at varying concentrations affect microbial communities and nitrogen cycling in tidal sediments over 30 days. They found that microplastics generally reduced microbial diversity and enhanced nitrogen fixation, with biodegradable PLA plastic showing concentration-dependent effects. The study suggests that microplastic contamination in coastal sediments can disrupt important nutrient cycling processes driven by microorganisms.
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Microplastics in coastal wetlands don't just pollute—they create tiny "islands" that host their own simplified, tight-knit microbial communities, and biodegradable plastics (often marketed as eco-friendly) actually cause bigger disruptions to these communities than traditional plastics do. This matters because these altered microbial hubs can potentially concentrate harmful bacteria and change how carbon and nitrogen cycle through coastal ecosystems, which humans rely on for fisheries, water filtration, and climate regulation. The good news: coastal plants (like marsh vegetation) helped buffer some of these negative
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