Researchers from Saint Louis University reveal the presence of microplastics in environments cordoned off from human presence for decades.
Microplastics, plastic particles smaller than 5.0 millimeters, have garnered global attention due to their prevalence in marine environments. However, Dr. Hasenmueller's research took an unconventional turn, diving into the subsurface.
“One of the most understudied areas in this field relates to what’s happening to the subsurface in terms of microplastic contamination,” explained Dr. Hasenmueller. “These particles could be getting into groundwater, a common drinking water resource, or caves, where fragile ecosystems exist.”As the research team ventured deeper into Cliff Cave's labyrinthine passages, they encountered a surprising correlation – flooding and microplastic levels.
However, the most startling discovery was that microplastics were nearly 100 times more concentrated in the cave's sediment than in its water. This suggests that microplastics settled in the cave's sediment, persisting even after flood waters subsided.Despite its isolation, Cliff Cave remains vulnerable to external influences. Its proximity to residential areas raises concerns about human contributions to microplastic contamination.
Microplastics threaten not only the cave environment but also the wildlife residing in Cliff Cave. Hasenmueller stressed the need for further research to understand the extent of this threat better and to develop strategies to safeguard these fragile ecosystems.
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