A specific species of plankton drove the red tide that brought dramatic bioluminescent light shows to the San Diego coast in the spring of 2020.
Lucas worked with a team of researchers who deployed a device to track movement up and down the water column.
They found the dinoflagellates that proliferated during the bloom had a pair of long whip-like tails that allowed them to swim near the surface during the day and then plunge 30-to-40 meters deep to eat nutrients at night.
The red tide event was large enough to alter the nearshore marine habitat. The algal bloom created toxins in the water and used up oxygen which led to fish kills that summer. “This incredible density of this red tide totally reshaped the coastal oceans bio-geochemistry relative to 70 years of data that we have from a nearby station, the so-called CalCOFI program, the nutrient conditions were completely and totally anomalous to that 70 years of data,” Lucas said.
The research validates a 50-year-old hypothesis made by Scripps researcher Richard “Dick” Eppley that vertical migration of dinoflagellates are responsible in part for harmful algal blooms that have been documented off the Southern California coast for 120 years.
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