genetic diversity among its populations, likely due to limitations on dispersal. Captive breeding, as well as the rehabilitation of manatee calves discovered without their mothers nearby, can supplement local conservation strategies, but populations are nevertheless at risk of inbreeding depression and local extinction. Whereas the population trends of the Florida manatee are relatively well monitored, population data for the Antillean manatee is sparse due to its patchy distribution, as well as the relative turbidity and low levels of light in its habitat which can mitigate the effectiveness of aerial or sonar-based surveys, often resulting in inaccurate or erroneous measurements. A 2016 study on the Antillean manatee population of Brazil found a potential range for current population size between 485 and 2,221 individuals. The U.S. Fish and Wildlife Service estimated in 2017 that as many as 6,782 individuals might exist in the Antillean subspecies, but these results rely in large part on personal anecdotes and may overestimate the true population number. A 2012 study of the Antillean population documented significant human-related causes of mortality, and projected that if the share of human-caused manatee deaths per year rose to 5% or more, the population would face a severe decline and eventual extinction. References External links ARKive – images and movies of the West Indian manatee (Trichechus manatus) Animal Diversity Website: Trichechus manatus Manatees Lived in Texas During the Last Ice Age, on: SciTechAlert, October 4, 2020, Source: University of Texas at Austin. EDGE species ESA threatened species Mammals described in 1758 Mammals of Colombia Mammals of French Guiana Mammals of Guyana Mammals of the Dominican Republic Mammals of Haiti Mammals of Puerto Rico Mammals of the Bahamas Mammals of the Caribbean Mammals of the United States Mammals of Trinidad and Tobago Sirenians Taxa named by Carl Linnaeus Symbols of Florida