Marine heat wave caused seabird deaths off California. El Nino could worsen the die-off

Marine heat wave conditions off parts of California have been linked to seabird deaths, and a developing El Niño could intensify the die-off, according to an Associated Press report. Marine ornithologist Tammy Russell described repeated surveys on San Diego beaches turning up seabird carcasses within minutes of arriving, with birds found among kelp and under rocks. Scientists say many species, including California brown pelicans, loons, and grebes, starved after record-setting ocean temperatures reduced cold, nutrient-rich surface water where krill, anchovies, and sardines thrive near shore. The report notes NOAA confirmed an El Niño in June expected to grow to historic strength. A warm anomaly off Southern California has been comparable to 2023 El Niño conditions, and that event could last until 2027. While not all deaths are attributed solely to the heat wave, officials say such events are becoming more frequent as oceans warm.