Sinking Fish May Fast-Track Mercury Pollution to the Deep Sea 
By Carolyn Wilke US Source: eos.org 12/22/2020
Carolyn Wilke
Isotopic analysis indicates that mercury found in deep-sea organisms may have an origin in carrion from near the surface

Mercury pollution at Earth’s surface is leaving a mark on the deepest parts of the ocean. A new study suggests that sinking fish carcasses transport the element to seafloor ecosystems.
 

“Mercury is not limited to the upper thousand meters of the ocean, as we once thought,” said Joel Blum, a biogeochemist at the University of Michigan in Ann Arbor. Blum and his colleagues scoped out the mercury content of organisms collected from roughly 6,000–10,000 meters below the ocean surface. That mercury contained chemical clues pointing to fish carcasses from shallower waters as its source, researchers reported in Proceedings of the National Academy of Sciences of the United States of America. The carrion provides a mercury “fast track” to the deep ocean, Blum said.

 
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