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Manatee Population Status Working Group’s (MPSWG) Recommendation of Population Benchmarks To Help Measure Recovery

The Manatee Population Status Working Group developed the following population benchmarks to assist in evaluating the status of the Florida manatee for reclassification to threatened status. In each of the four regions of the Florida manatee population (Northwest, Southwest, Atlantic, and Upper St. Johns River): 1. the average annual estimated rate of adult survival is at least 94%, with statistical confidence that the rate is not less than 90%; 2. the average annual percentage of adult females with calves during winter is at least 40%; and 3. the average annual rate of population growth is at least 4%, with statistical confidence that the rate is not less than 0 (no growth).