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Francois Ribalet, a research associate professor at the University of Washington's School of Oceanography, holds a vial of Prochlorococcus on Friday, Sept. 5, 2025, in Seattle. (AP Photo/Annika Hammerschlag)

Warming seas threaten key phytoplankton species that fuels the food web, study finds

- Associated Press

For decades, scientists believed Prochlorococcus, the smallest and most abundant phytoplankton on Earth, would thrive in a warmer world. But new research suggests the microscopic bacterium, which forms the foundation of the marine food web and helps regulate the planet's climate, will decline sharply as seas heat up.