From ABC Action News:
TALLAHASEE, FL -- Florida Fish and Wildlife Officials announced Tuesday that due to the prolonged cold temperatures the past three months, 431 manatee deaths have already been documented.
Officials say exposure to low temperatures for a long period of time can cause a condition called "manatee cold-stress syndrome," which can result in death.
Last year the FWC documented 429 manatee deaths, which exceeded the highest number on record until now.
The Fish and Wildlife Research Institute Director said the rate of mortality so far this year is of great concern and that they will focus on determining the long-term implications for the manatee population.