The recent harmful algae bloom along Southern California’s coast, one of the largest and deadliest in history, has officially ended. The bloom, fueled by nutrient-rich waters, claimed the lives of hundreds of dolphins and sea lions from Baja California to the Central Coast. Although the levels of toxic algae species have decreased, marine mammals remain at risk as scientists continue rehabilitation efforts.
The Southern California Coastal Ocean Observing System (SCCOOS) reported that toxic algae levels have dropped below dangerous thresholds. However, experts warn that the coastal ecosystem is not yet safe. Dave Bader, a marine biologist, emphasized that the work of rehabilitating affected animals is ongoing.
This year’s bloom was particularly severe, causing significant harm to breeding female sea lions. The outbreak’s intensity might be linked to debris runoff from January’s wildfires. Researchers are investigating whether fire retardants and ash runoff contributed to the bloom’s severity. According to the Oceanic Preservation Society, these chemicals may have acted as fertilizers, promoting algae growth.
The bloom produced neurotoxins like domoic acid, which accumulate in the food chain, affecting marine mammals that consume contaminated fish. The NOAA Fisheries reported that rescue teams are prioritizing animals with the best chances of recovery. The full environmental impact of consecutive blooms during breeding seasons remains uncertain, with researchers concerned about long-term effects on marine life.
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