Reconstructing population dynamics of a threatened marine mammal using multiple data sets

Scientific Reports
By: , and 



Models of marine mammal population dynamics have been used extensively to predict abundance. A less common application of these models is to reconstruct historical population dynamics, filling in gaps in observation data by integrating information from multiple sources. We developed an integrated population model for the Florida manatee (Trichechus manatus latirostris) to reconstruct its population dynamics in the southwest region of the state over the past 20 years. Our model improved precision of key parameter estimates and permitted inference on poorly known parameters. Population growth was slow (averaging 1.02; 95% credible interval 1.01–1.03) but not steady, and an unusual mortality event in 2013 led to an estimated net loss of 332 (217–466) manatees. Our analyses showed that precise estimates of abundance could be derived from estimates of vital rates and a few input estimates of abundance, which may mean costly surveys to estimate abundance don’t need to be conducted as frequently. Our study also shows that retrospective analyses can be useful to: (1) model the transient dynamics of age distribution; (2) assess and communicate the conservation status of wild populations; and (3) improve our understanding of environmental effects on population dynamics and thus enhance our ability to forecast.

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Publication type Article
Publication Subtype Journal Article
Title Reconstructing population dynamics of a threatened marine mammal using multiple data sets
Series title Scientific Reports
DOI 10.1038/s41598-021-81478-z
Volume 11
Year Published 2021
Language English
Publisher Nature
Contributing office(s) Patuxent Wildlife Research Center, Wetland and Aquatic Research Center
Description 2702 , 15 p.
Country United States
State Florida
Other Geospatial Southwest Florida
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