Dear MARMAM community, My co-authors and I are pleased to share our new publication, "Evaluating the effectiveness of retrofitting water control structures with manatee protection systems to reduce mortality" published in the Journal of Wildlife Management. Available at: https://doi.org/10.1002/jwmg.70002 Abstract: Minimizing human-related manatee mortality is a priority management action for Florida manatee (Trichechus manatus latirostris) conservation and recovery. Manatees encounter navigational locks and water control structures along travel corridors, and fatal encounters can occur from crushing, impingement, or entrapment that subsequently result in drowning. Extensive mitigation efforts have been made to protect manatees. This study evaluates the effectiveness of manatee protection systems at navigational locks and water control structures using negative binomial regression models and Friedman's tests with pairwise comparisons from 1974–2020 mortality data. Mitigation effort was stratified into 4 groups ranging from no mitigation to fully mitigated. Regression models for 223 structure-related manatee deaths showed the expected number of annual mortalities was ≤0.26 for all mitigation groups at each structure type. Friedman's tests indicated a difference in mortalities among mitigation efforts for navigational locks (χ22 = 10.75, P = 0.004) and water control structures (χ22 = 16.63, P ≤ 0.001). Mortalities at fully mitigated water control structures were lower than at partially mitigated structures in pairwise testing for both analyses; navigational lock mitigation efforts only differed in Wilcoxon rank sums tests. Combined results show that when current manatee protection systems are functional and protocols are followed, mortality is reduced. While these systems are a conservation achievement, continued re-evaluation of mitigation efforts and investigation into new technologies are needed to ensure the continued reduction or elimination of structure-related manatee mortalities. Feel free to reach out to kkbrightwell@gmail.com<mailto:kkbrightwell@gmail.com> for questions about the paper and to ImperiledSpecies@MyFWC.com for specific questions about manatee protection systems. Best, [WEST_FINAL updated green.png]<https://west-inc.com/> Innovative Solutions Through Applied Science . Kristy Brightwell Consulting Biologist (she/her) w: 307-996-8874<tel:307-996-8874> e: kbrightwell@west-inc.com<mailto:kbrightwell@west-inc.com> a: Remote Georgia, United States [cid:1eb93a42-aa7a-435c-b9d4-19b088432dd9]<https://west-inc.com/news-insights/news-events/> [cid:ec660624-4e26-4d10-a896-0a79ddb68c87] <https://www.linkedin.com/company/westernecosystems/>
