A new study found that when red tides began in early summer and continued into the fall, low oxygen areas—or dead zones— were more likely to also occur. This study by scientists at the University of Miami Rosenstiel School of Marine and Atmospheric Science, and NOAA collaborators is the first study to link low oxygen—or hypoxia—to red tides across the west coast of Florida and offers new information to better understand the conditions favorable for combined events as they are expected to increase as Earth continues to warm.
"These events are so disruptive they are being incorporated in population assessments of some grouper species for use in fishery management decisions. During the 2005 red tide that also had, it was estimated that about 30% of the red grouper population was killed," said Brendan Turley, an assistant scientist at the UM Rosenstiel School and NOAA's Cooperative Institute of Marine and Atmospheric Studies.
The study, conducted as part of NOAA's Gulf of Mexico Integrated Ecosystem Assessment Program, examined nearly 20 years of oceanographic data that included temperature, salinity, and dissolved oxygen from the surface to the seafloor across the West Florida Shelf to determine the frequency of hypoxia and association with known red tides.
The study, titled"Relationships between blooms of Karenia brevis and hypoxia across the West Florida Shelf," will appear in the May issue of the journal, which is currently online.
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