Marine Heatwave Alters Kelp Ecosystems Along Central California Coast

A marine heatwave that established itself off the Central California coast in spring has now bleached an estimated forty percent of the region's nearshore kelp forests, according to aerial survey data released by the California Department of Fish and Wildlife.

The ecological impact extends beyond aesthetics. Kelp forests provide a damping effect on wave energy as it approaches the shoreline — a phenomenon that longtime surfers at breaks like Pleasure Point and Steamer Lane know well. With kelp coverage reduced, wave faces are arriving with slightly more energy and less predictable shape at some spots.

Marine scientists note that the current heatwave is consistent with long-term sea surface temperature trends in the California Current system. Restoration projects have been underway for several years, but ecologists caution that replanting efforts are unlikely to reverse the losses faster than warming events are causing them.