A study of 38 lakes and reservoirs in 23 countries found that Lake Tahoe had the third-highest concentration of microplastics.
Sudeep Chandra, the director of the Global Water Center at the University of Nevada, Reno, and co-author of the study, said the research highlights just how pervasive microplastics have been in freshwater ecosystems. Every lake sampled — even the most remote lakes — contained microplastics. That included Castle Lake near Mount Shasta in Northern California.
Although the study did not cover the source of microplastics — that’s what the researchers will tackle next — Chandra said he suspects the large surface area primes the lake to receive more microplastics from the atmosphere. Brahney said microplastics kicked up from the friction on highways around Lake Tahoe could get caught up in the atmosphere, then deposited into the lake, despite its small watershed. There’s “no doubt there’s a significant source of atmospheric deposition to Lake Tahoe,” she said.
“It’s a highly protected lake, but it’s protected in a way that allows the balance of humans to come here and use it and enjoy it,” he said. “I think it’s that unique setting that has allowed a beautiful place like this to potentially have really high concentrations of microplastics in the water over time.
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