Algae Blooms, Seagrass Loss, and Manatee Deaths
Article Reference: Algae Blooms, Seagrass Loss, and Manatee Deaths
Trouble for Manatees in the Indian River Lagoon
The Indian River Lagoon (IRL) stretches for 156 miles along Florida’s east central coast. There are more than 4,400 species of plants and animals — including manatees — that are found in the lagoon watershed. Unfortunately, as the direct result of human derelictions over many decades, the Indian River Lagoon has suffered a series of harmful algal blooms, leading to massive losses in seagrass coverage and, in turn, the recent deaths of a heart-rending number of manatees.
Manatees gathering at warm water locations such as powerplants along the IRL faced an additional threat during the 2020-2021 and 2021 – 2022 winter seasons because there was very little seagrass or vegetation for them to eat in the immediate vicinity. Traveling further for forage would mean deadly exposure to cold water, so the manatees ultimately choose to forgo feeding over dying from the cold. Between December 2020 and May 2021, there were 677 dead manatees reported on Florida’s east coast. In 2021, the U.S. Fish and Wildlife Service (FWS) declared an Unusual Mortality Event (UME) for manatees. A UME involves a significant die-off of any marine mammal population and demands immediate response.