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Not just settling
Summary
This perspective piece describes research showing that deep-sea microplastic distribution is controlled not by simple sinking from the surface but by deep ocean thermohaline currents that create localized accumulation hotspots on the seafloor. Understanding these current-driven concentration patterns changes how scientists model microplastic fate in the deep ocean.
Plastic Pollution What controls the distribution of microplastics on the deep seafloor? Kane et al. show that the answer to that question is more complicated than particles simply settling from where they are found on the sea surface (see the Perspective by Mohrig). Using data that they collected off the coast of Corsica, the authors show that thermohaline-driven currents can control the distribution of microplastics by creating hotspots of accumulation, analogous to their role in causing focused areas of seafloor sediment deposition. Such currents also supply oxygen and nutrients to deep-sea benthos, so deepsea biodiversity hotspots are also likely to be microplastic hotspots. Science , this issue p. [1140][1]; see also p. [1055][2] [1]: /lookup/doi/10.1126/science.aba5899 [2]: /lookup/doi/10.1126/science.abc1510