A harmful algae bloom that plagued Southern California is finally over, but the aftermath is still concerning for marine life. This bloom was one of the largest and deadliest on record, impacting marine mammals from Baja California to the Central Coast. Hundreds of dolphins and sea lions lost their lives due to the toxic conditions.
The Southern California Coastal Ocean Observing System (SCCOOS) reported that levels of toxic algae have dropped below harmful thresholds. This is a relief for marine wildlife and the people working to save them from the effects of neurotoxin poisoning. However, experts warn that the coastal ecosystem is still at risk.
This year’s bloom appeared earlier than usual and was fueled by nutrient-rich waters from the deep ocean, a phenomenon linked to upwellings. It marks the fourth consecutive year of such outbreaks along the Southern California coast. Researchers are investigating whether runoff from wildfires earlier this year contributed to the bloom’s severity.
Dave Bader, a marine biologist from the Marine Mammal Care Center in San Pedro, emphasized that while the bloom is over, the work to rehabilitate affected animals continues. He cautioned that further outbreaks could still occur this year.
The bloom was particularly devastating for breeding females, as many pregnant sea lions were unable to give birth to live pups. The toxins from the algae can cross the placenta, impacting the health of unborn animals. This raises concerns about the long-term effects of repeated blooms during critical breeding seasons.
In February, dead and sick marine mammals began washing up on California’s beaches, showing symptoms like aggression and lethargy. While veterinarians worked hard to save them, fewer animals were rescued compared to previous years.
The bloom was worse than past outbreaks, with significant mortality rates. Experts are still assessing the full impact on marine species, especially given the frequency of these harmful events. As climate change continues to influence ocean conditions, scientists predict that harmful algae blooms may become more common in the future.