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Keith Diagne, Lucy W.
(detail)
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2012 |
The forgotten sirenian.
Seagrass-Watch News (Cairns, Australia, Northern Fisheries Centre) Issue 46: 14-17. 10 figs. June 2012.
–Diet and distribution of TS in West Africa; and the rescue and captive rearing of "Victor", an orphaned calf in Gabon.
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Keith Diagne, Lucy W.
(detail)
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2014 |
Phylogenetics and feeding ecology of the African manatee (Trichechus senegalensis).
University of Florida. 263 pp.
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Adimey, Nicole M.; Ross, Monica; Hall, Madison; Reid, James P.; Barlas, Margaret E.; Keith Diagne, Lucy W.; Bonde, Robert K.
(detail)
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2016 |
Twenty-six years of post-release monitoring of Florida manatees (Trichechus manatus latirostris): evaluation of a cooperative rehabilitation program.
Aquatic Mamms. 42(3): 376-391. 3 tabs. 5 figs. DOI 10.1578/AM.42.3.2016.376.
–ABSTRACT: The rescue, rehabilitation, and release of Florida manatees (Trichechus manatus latirostris) into the wild has occurred since 1974; however, a comprehensive evaluation of the outcomes of the releases has never been conducted. Herein, we examined data for 136 Florida manatees that were rehabilitated and released with telemetry tags between 1988 and 2013 to determine release outcome of each individual as either success (acclimation) or failure after at least 1 y. Ten predictor variables were statistically evaluated for potential relationships to release outcome. To assess the contribution of each predictor variable to release outcome, each variable was tested for significance in univariate analyses. Manatees born in captivity experienced poor success after release (14%), whereas the overall success of wild-born individuals was higher (72%). When compared with other variables in our dataset, number of days in captivity was the strongest predictor for determining success. Manatees rescued as calves and held in captivity for more than 5 y had a high likelihood of failure, while subadults and adults had a high likelihood of success, regardless of the amount of time spent in captivity. Ensuring the success of individual manatees after release is critical for evaluating the contribution of the manatee rehabilitation program to the growth of the wild population.
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Marsh, Helene D.; Arraut, Eduardo Moraes; Keith Diagne, Lucy; Edwards, Holly H.; Marmontel, Miriam
(detail)
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2017 |
Impact of climate change and loss of habitat on sirenians. Chap. 19 in: Andy Butterworth (ed.), Marine mammal welfare: human induced change in the marine environment and its impacts on marine mammal welfare.
Springer International Publishing: Animal Welfare Series, Vol. 17: 333-357. DOI: https://doi.org/10.1007/978-3-319-46994-2. June 20, 2017.
–ABSTRACT: Although the impacts of climate change on the welfare of individual manatees and dugongs are still uncertain, the effects are likely to be through indirect interactions between meteorological and biotic factors and the human responses to climate change. We divided the potential impacts into (1) those that will potentially affect sirenians directly including temperature increases, sea-level rise, increased intensity of extreme weather events and changes in rainfall patterns and (2) indirect impacts that are likely to cause harm through habitat loss and change and the increase in the likelihood of harmful algal blooms and disease outbreaks. The habitat modification accompanying sea-level rise is likely to decrease the welfare of sirenians including increased mortality. Many species of tropical seagrasses live close to their thermal limits and will have to up-regulate their stress-response systems to tolerate the sublethal temperature increases caused by climate change. The capacity of seagrass species to evoke such responses is uncertain, as are the effects of elevated carbon dioxide on such acclimation responses. The increase in the intensity of extreme weather events associated with climate change is likely to decrease the welfare of sirenians through increased mortality from strandings, as well as habitat loss and change. These effects are likely to increase the exposure of sirenians to disease and their vulnerability to predators, including human hunters. Climate-related hazards will also exacerbate other stressors, especially for people living in poverty. Thus the risks to sirenians from climate change are likely to be greatest for small populations of dugongs and manatees occurring in low-income countries. The African manatee will be particularly vulnerable because of the high levels of human poverty throughout most of its range resulting in competition for resources, including protein from manatee meat.
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Hunter, Margaret E.; Meigs-Friend, Gaia; Ferrante, Jason A.; Takoukam Kamla, Aristide; Dorazio, Robert M.; Keith Diagne, Lucy; Luna, Fabia; Lanyon, Janet M.; Reid, James P.
(detail)
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2018 |
Surveys of environmental DNA (eDNA): a new approach to estimate occurrence in Vulnerable manatee populations.
Endangered Species Research 35: 101-111. doi:10.3354/esr00880. Mar. 13, 2018.
–ABSTRACT: Environmental DNA (eDNA) detection is a technique used to non-invasively detect cryptic, low density, or logistically difficult-to-study species, such as imperiled manatees. For eDNA measurement, genetic material shed into the environment is concentrated from water samples and analyzed for the presence of target species. Cytochrome b quantitative PCR and droplet digital PCR eDNA assays were developed for the 3 Vulnerable manatee species: African, Amazonian, and both subspecies of the West Indian (Florida and Antillean) manatee. Environmental DNA assays can help to delineate manatee habitat ranges, high use areas, and seasonal population changes. To validate the assay, water was analyzed from Florida's east coast containing a high-density manatee population and produced 31564 DNA molecules l-1 on average and high occurrence (?) and detection (p) estimates (? = 0.84 [0.40-0.99]; p = 0.99 [0.95-1.00]; limit of detection 3 copies µl-1). Similar occupancy estimates were produced in the Florida Panhandle (? = 0.79 [0.54-0.97]) and Cuba (? = 0.89 [0.54-1.00]), while occupancy estimates in Cameroon were lower (? = 0.49 [0.09-0.95]). The eDNA-derived detection estimates were higher than those generated using aerial survey data on the west coast of Florida and may be effective for population monitoring. Subsequent eDNA studies could be particularly useful in locations where manatees are (1) difficult to identify visually (e.g. the Amazon River and Africa), (2) are present in patchy distributions or are on the verge of extinction (e.g. Jamaica, Haiti), and (3) where repatriation efforts are proposed (e.g. Brazil, Guadeloupe). Extension of these eDNA techniques could be applied to other imperiled marine mammal populations such as African and Asian dugongs.
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Bibliography and Index of the Sirenia and Desmostylia 