Scientists say a persistent marine heat wave off California is contributing to large numbers of seabird deaths, with experts warning that an upcoming El Niño could intensify the conditions. Researchers report seabirds are starving as marine life shifts away from the cooler, nutrient-rich waters near the surface. They say the heat wave reduces the nearshore “cold water” band that typically supports prey such as krill and forage fish including anchovies and sardines. As surface waters become warmer and stratified, those prey items move deeper or farther offshore to find cooler temperatures, leaving seabirds with less food near beaches and coastal habitats.
Multiple outlets cite the observations of scientists working in the region, including marine ornithologists who document seabird carcasses arriving in patterns consistent with deteriorating food availability. The reports also note that scientists are watching forecasts for El Niño, which can alter ocean temperatures and circulation, potentially prolonging or worsening marine heat conditions. Scientists emphasize that continued monitoring is needed to understand the scale and duration of the die-off and how it may affect broader coastal ecosystems.
