Manatees are slow-moving herbivores critically dependent on warm water. Boat strike injuries, algal blooms, and cold stress events cause mass mortality and chronic suffering in Florida and beyond.
Manatees experience severe acute welfare harms from boat strikes — propeller lacerations cause traumatic injuries that may require months of rehabilitation to heal, and some injuries result in chronic pain or physical disability even in survivors. The 2021-2022 starvation crisis represented an acute mass welfare emergency as manatees died from malnutrition due to seagrass loss caused by water quality degradation from pollution. Cold stress syndrome causes hypothermia and immune dysfunction in animals unable to reach warm water. Human provisioning of warm water at power plant outflows has created artificial warm-water dependency, complicating long-term conservation. The cumulative effect of propeller strikes, habitat degradation, and thermal stress creates a picture of chronic welfare compromise for much of the population.