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Simulated microplastics lurk below the ocean surface
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Researchers developed a computer model showing that algae growing on floating plastic debris and ocean density gradients cause microplastics to sink below the surface, making them much harder to detect and remove. This finding suggests that ocean plastic pollution is far more widespread in subsurface waters than surface surveys indicate.
A generalizable dynamics model shows that algal growth and a density gradient affect the buoyancy of floating debris.
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Far more microplastics floating in oceans than thought
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A new sampling method revealed that southern ocean microplastic concentrations are 37 times higher than previously estimated, suggesting that existing models have dramatically underestimated the scale of plastic pollution in Earth's most remote marine environments.
We estimate up to 14 million tonnes of microplastics lie on the seafloor. It’s worse than we thought
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Deep-sea sediment sampling estimates up to 14 million tonnes of microplastics have accumulated on the ocean floor, roughly 35 times the estimated weight of plastic floating on the ocean surface. This finding fundamentally changes the understanding of where plastic pollution resides and suggests the long-term ecological burden on marine ecosystems is far greater than surface measurements have indicated.
Analysis of Marine Microplastics in the Water Column Sampled up to 300 M Depth
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Researchers sampled ocean water down to 300 meters depth and detected microplastics throughout the water column, demonstrating that plastic pollution extends well below the surface and is not limited to the shallow or coastal zones most commonly studied.
Microplastics may pose a greater threat to the base of marine food webs
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This perspective argues that small animals at the base of marine food webs—such as zooplankton and filter feeders—are likely ingesting microplastics at higher rates than larger organisms, yet receive far less research attention. Because these foundational species transfer energy and contaminants to every level of the food chain, microplastic impacts at the base could have outsized consequences for entire marine ecosystems and human seafood safety.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.