West Indian manatees face chronic threats from boat propeller strikes, habitat loss, and cold stress. Boat strikes are among the leading causes of manatee injury and death in Florida waters.
Boat strike injuries cause acute pain and long-term impairment in manatees. Propeller wounds often sever fins or cause deep lacerations requiring months of rehabilitation. Many manatees survive but bear permanent scars and disability. Beyond physical trauma, manatees face chronic nutritional stress as seagrass beds — their primary food source — decline due to algal blooms from agricultural runoff. Cold stress events during harsh winters kill manatees that lack access to warm refuges.