kudela

Earth’s oceans have been getting greener at the poles and becoming bluer closer to the equator, according to a study published Thursday in Science. The shift reflects changes in marine ecosystems, which experts say could affect fish populations and create problems for fisheries, including in California. “It has lots of potential implications for the way…

Velellas typically wash ashore in Northern California in spring or early summer, because “in the spring is when we have upwelling,” explains Raphael Kudela, a marine scientist at University of California, Santa Cruz, to KQED’s Danielle Venton and Sarah Mohamad. “Upwelling brings lots of nutrients, and lots of nutrients bring phytoplankton and zooplankton.”