Lefebvre, Lynn W.: SEE ALSO Buckingham et al., 1999; Marsh & Lefebvre, 1994; Miller et al., 1999; Montoya et al., 2001; O'Shea et al., 2001; Zoodsma et al., 1991.
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Lefebvre, Lynn W.; O'Shea, Thomas J.; Rathbun, Galen B.; Best, Robin Christopher
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1989 |
Distribution, status, and biogeography of the West Indian manatee. In: C. A. Woods (ed.), Biogeography of the West Indies: past, present, and future.
Gainesville (Florida), Sandhill Crane Press (xvii + 878): 567-609. 12 figs.
–Reviews historical, distributional, and status information from all countries within the range of T. manatus, and discusses aspects of habitat that account for limits to the species' distribution.
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Lefebvre, Lynn W.; Powell, James Arthur, Jr.
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1990 |
Manatee grazing impacts on seagrasses in Hobe Sound and Jupiter Sound in southeast Florida during the winter of 1988-89.
NTIS Document No. PB 90-271883: vi + 36. 6 tabs. 12 figs. Aug. 1990.
–Includes an appendix by Domning (34-36; see Domning, D.P., 1990a).
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Lefebvre, Lynn W.; Kochman, Howard I.
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1991 |
An evaluation of aerial survey replicate count methodology to determine trends in manatee abundance.
Wildl. Soc. Bull. 19: 298-309. 2 tabs. 4 figs.
–Analyzes winter survey data from Crystal and Homosassa rivers, Florida, 1985-86. Concludes that unit-recount surveys (Packard et al., 1986) should not be used to develop a population index based on resightings of individuals, but can serve to improve survey designs and to obtain an index with a measure of variation at specific aggregation sites. They could also be used in conjunction with a "variable effort recount" method, to standardize the latter and make the former method more flexible.
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Marsh, Helene D.; Lefebvre, Lynn W.
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1994 |
Sirenian status and conservation efforts.
Aquatic Mammals 20(3): 155-170. 2 tabs. 9 figs.
–Summarizes published and unpublished data on the status of the living taxa of sirs., emphasizing T. m. manatus, T. m. latirostris, and D. dugon (155-164); outlines conservation efforts in Florida and Australia (164-165); and reports the outcomes of three recent international meetings on sir. rersearch and conservation (165-168).
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Lefebvre, Lynn W.; O'Shea, Thomas J.
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1995 |
Florida manatees. In: E. T. LaRoe, G. S. Farris, C. E. Puckett, P. D. Doran, & M. J. Mac (eds.), Our living resources: a report to the nation on the distribution, abundance, and health of U.S. plants, animals and ecosystems.
Washington, U.S. Dept. Interior, Natl. Biol. Service (xi + 530 pp.): 267-269. 1 tab. 2 figs.
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Lefebvre, Lynn W.; Ackerman, Bruce B.; Portier, Kenneth M.; Pollock, Kenneth H.
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1995 |
Aerial survey as a technique for estimating trends in manatee population size - problems and prospects. In: T. J. O'Shea, B. B. Ackerman, & H. F. Percival (eds.), Population biology of the Florida manatee (q.v.).
Information & Technology Rept. (U.S. Dept. Interior, Natl. Biological Service) (vi + 289) 1: 63-74. 4 tabs. 3 figs. Aug. 1995.
–Abstr. in O'Shea et al. (1992: 11-13).
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Miller, Karl E.; Ackerman, Bruce B.; Lefebvre, Lynn W.; Clifton, Kari P.
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1999 |
An evaluation of strip-transect aerial survey methods for monitoring manatee populations in Florida.
Wildl. Soc. Bull. 26(3): 561-570. 3 tabs. 3 figs. "Fall 1998"; publ. 1999.
–Surveys of the Banana River, Florida, in 1993-94 were the first to use replicated strip-transect methods on manatees. Concludes that this protocol could detect a 5% annual rate of change in <4 years with power of 0.75 or more, and recommends that such surveys be used in the Banana River to corroborate other evidence of population trends on the east coast of Florida.
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Lefebvre, Lynn W.; Reid, James P.; Kenworthy, W. Judson; Powell, James Arthur, Jr.
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2000 |
Characterizing manatee habitat use and seagrass grazing in Florida and Puerto Rico: implications for conservation and management.
Pacif. Conserv. Biol. 5: 289-298. 1 tab. 2 figs.
–Compares manatee use of seagrasses in the Indian River Lagoon and eastern Puerto Rico, and with reports of seagrass use by dugongs. Manatees grazed more frequently on the locally most abundant species, exhibited possible cultivation grazing, and appeared to prefer Thalassia associated with clumps of Halimeda opuntia, which they pushed aside to get at the Thalassia. Florida manatees are hypothesized to be less specialized seagrass grazers than manatees in tropical regions.
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O'Shea, Thomas J.; Lefebvre, Lynn W.; Beck, Cathy A.
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2001 |
Florida manatees: perspectives on populations, pain, and protection. In: L. A. Dierauf & F. M. D. Gulland (eds.), CRC handbook of marine mammal medicine. Ed. 2.
Boca Raton, CRC Press: 31-43. 1 tab. 3 figs.
–Calls attention to the pain suffered by manatees that survive boat strikes, provides "a simple primer on concepts and uncertainties in manatee population biology", and argues that these uncertainties are no excuse for failing to take management actions.
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Lefebvre, Lynn W.; Provancha, Jane A.; Slone, Daniel H.; Kenworthy, W. Judson
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2017 |
Manatee grazing impacts on a mixed species seagrass bed.
Marine Ecology Progress Series 564: 29-45. 2 tabs. 9 figs. doi:10.3354/meps11986. Jan. 2016.
–ABSTRACT: The endangered manatee Trichechus manatus is one of few large grazers in seagrass systems. To assess the long-term impacts of repeated grazing on seagrasses, we selected a study site within Kennedy Space Center in the northern Banana River, Brevard County, Florida, that was typically grazed by large numbers of manatees in spring. Two 13 × 13 m manatee exclosures and 2 paired open plots of equal size were established at the study site in October 1990. Shoot counts, biomass, and species composition of the co-dominant seagrass species, Syringodium filiforme and Halodule wrightii, were sampled 3 times per year in all 4 plots between October 1990 and October 1994. We used a Bayesian modelling approach, accounting for the influence of depth, to detect treatment (exclosed vs. open) effects. S. filiforme shoot counts, total biomass, and frequency of occurrence significantly increased in the exclosures. By July 1993, mean biomass values in the exclosures (167 g dry wt m?²) greatly exceeded those in the open plots (28 g dry wt m?²). H. wrightii decreased in the exclosures by 1994. Initially, both S. filiforme and H. wrightii responded positively to release from manatee grazing pressure. As S. filiforme continued to become denser in the exclosures, it gradually replaced H. wrightii. Our findings may be helpful to biologists and managers interested in predicting seagrass recovery and manatee carrying capacity of repeatedly grazed seagrass beds in areas of special significance to manatees and seagrass conservation.
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Bibliography and Index of the Sirenia and Desmostylia 