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An ecotoxicological risk model for the microplastics in arctic waters
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Researchers developed a novel ecotoxicological risk model for microplastics in Arctic marine waters, incorporating oxidative stress as a toxicity endpoint and accounting for Arctic-specific environmental conditions and species physiology. The model predicted elevated risk for Arctic biota under current microplastic concentrations, particularly for filter feeders and small crustaceans.
The risk posed to Arctic marine life by microplastics, a Contaminants of Emerging Arctic Concern (CEAC), is poorly known. The reason is the limited understanding of the dose-response relationship due to the region's peculiar environmental and geophysical properties and the unique physiological properties of the species living there. The properties of microplastics in the region and their distribution across the oceanic profile further complicate the problem. This paper addresses the knowledge gap by proposing a novel comprehensive ecotoxicity model. The model uses oxidative stress caused by the Reactive Oxygen Species (ROS) to assess cell mortality. Cell mortality has been used as an indicator of ecological risk. The model is implemented in the Bayesian Network (BN) framework to evaluate the cytotoxicity, measured as the probability of causing mortality. The work enhances the understanding and assessment of the cytotoxicity of microplastics in polar cod and associated risks.
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This study evaluated the toxicity of microplastics collected from the supralittoral zone of the Barents Sea on marine organisms, finding that environmental microplastics caused measurable oxidative stress and mortality effects in test species.
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A toxicokinetic/toxicodynamic modeling approach was developed to link microplastic exposure levels to physiological effects in freshwater fish, providing a mechanistic framework for health risk assessment. The model filled a gap between environmental exposure data and ecological risk evaluation for fish populations in microplastic-contaminated freshwaters.
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Microplastics were detected across surface waters of the Russian Arctic seas, with concentrations and polymer types varying by region and season. The findings document that even high-latitude Arctic waters are not spared from microplastic contamination, likely transported by ocean currents and rivers.
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Researchers built a food web model simulating microplastic and chemical contaminant transfer through an Arctic marine food chain from zooplankton to polar bears. The model found that while microplastics themselves do not biomagnify substantially through trophic levels, they can alter the bioaccumulation patterns of hydrophobic organic chemicals depending on the chemical properties and organism physiology.
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