Bibliography and Index of the Sirenia and Desmostylia  

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"Byers, Floyd M"

Byers, Floyd M.: SEE Ortiz et al., 1999. (detail)
Ortiz, Rudy M.; Worthy, Graham A. J.; Byers, Floyd M. (detail)
Estimation of water turnover rates of captive West Indian manatees (Trichechus manatus) held in fresh and salt water.
Jour. Exper. Biol. 202(1): 33-38. 2 tabs. Jan. 1999.
–Reports that animals held in fresh water had the highest water turnover rates (145ñ12 ml/kg/day); animals acutely exposed to salt water decreased their turnover rate significantly, then increased it upon re-entry into fresh water. Manatees chronically exposed to salt water and fed seagrass had very low turnover rates compared with ones held in salt water but fed lettuce, which is consistent with a lack of drinking of seawater. Manatees in fresh water drank large volumes of water, which may make them susceptible to hyponatremia if a source of sodium (such as access to marine environments) is not provided.

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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