Bibliography and Index of the Sirenia and Desmostylia  

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"Humphrey, Stephen R."

Humphrey, Stephen R.: SEE Marmontel et al., 1990, 1996, 1997. (detail)
 
 
 Marmontel, Miriam; O'Shea, Thomas J.; Humphrey, Stephen R. (detail)
   
1990
An evaluation of bone growth-layer counts as an age-determination technique in Florida manatees.
NTIS Document No. PB 91-103564: x + 94. 9 tabs. 34 figs. Sept. 1990.
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 Marmontel, Miriam; O'Shea, Thomas J.; Kochman, Howard I.; Humphrey, Stephen R. (detail)
   
1996
Age determination in manatees using growth-layer-group counts in bone.
Mar. Mamm. Sci. 12(1): 54-88. 3 tabs. 17 figs. Jan. 2, 1996.
–Describes growth-layer groups in an enlarged sample of T. m. latirostris and T. m. manatus, showing that maximum layer counts are obtained from the middle third of the dome region (= pars temporalis or tegmen tympani) of the periotic bone, and that data from known-age, known minimum-age, and tetracycline-marked animals are consistent with annual deposition of the layers. Bone resorption does not affect accuracy of layer counts until ages greater than about 15 years and body lengths greater than 300 cm are attained. Use of layer counts from the periotic bone is considered suitable for studies of population dynamics and other age-related aspects of manatee biology.
x
 
 Marmontel, Miriam; Humphrey, Stephen R.; O'Shea, Thomas J. (detail)
   
1997
Population viability analysis of the Florida manatee (Trichechus manatus latirostris).
Conserv. Biol. 11(2): 467-481. 3 tabs. 5 figs. Apr. 1997.
–Spanish summ. Computer modeling, based on data fron 1,212 salvaged carcasses, projects an unacceptably low probability of population persistence over 1,000 years. A 10% increase in adult mortality, or a 10% decrease in reproduction, would cause extinction within that period, whereas a 10% decrease in adult mortality would allow slow population growth. Increasing numbers of people and boats portend an increase in manatee mortality; therefore, without effective regulation of boating, the Florida manatee is likely to decline slowly to extinction.
Daryl P. Domning, Research Associate, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, and Laboratory of Evolutionary Biology, Department of Anatomy, College of Medicine, Howard University, Washington, D.C. 20059.
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