Manatees are herbivores, feeding on a large variety of submerged, emergent, and floating plants. They can eat up to 10% of their body weight in vegetation daily. Seagrass beds are important feeding sites. Many of these coastal and estuarine feeding areas are particularly vulnerable to destruction by prolonged salinity changes, dredge and fill activities, surface water run-off from nearby construction sites or agricultural lands and herbicide spraying.
- Graphs of 1995-2015 River Salinity at JU Dock & Monthly of years 2012-2015
- Excel data file JU (12/02/2002 - 09/19/2015)
- REAL TIME NOAA PORTS DATA at JU
Grass Bed Maps for St. John's River, Duval Co. 1997