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Dry weather raises salinity in the lagoon; brown tide and calerpa presence tracked ahead of 2025 seagrass mapping
Summary
State and federal scientists reported rising salinities, localized phytoplankton blooms (Aureoumbra), seagrass seed distribution and a possible new calerpa species sighting as aerial mapping and monitoring continue.
State and federal water-quality scientists updated the Indian River Lagoon Council Friday on continuing dry conditions, seagrass mapping plans and biological observations in both the northern/central lagoon and the St. Lucie estuary.
Northern and central lagoon conditions
Lauren Hall, of the St. Johns River Water Management District, reported mostly dry weather and stable depths at continuous monitoring sites and said salinities are up across the northern and central stations. "We are seeing some blooms . . . particularly in Southern Mosquito Lagoon," Hall said, identifying Aureoumbra (brown tide) as present though not at the extreme levels seen in 2012 and 2016. She noted that chlorophyll fluorescent…
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