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"Worthy, Graham A. J"

Worthy, Graham A. J.: SEE ALSO Courbis & Worthy, 2003; Dierauf, L. A., 1990; Ortiz & Worthy, 2004; Ortiz et al., 1998, 1999. (detail)
Worthy, Graham A. J.; Hickie, John P. (detail)
Relative brain size in marine mammals.
Amer. Naturalist 128(4): 445-459.
Ortiz, Rudy M.; Worthy, Graham A. J.; MacKenzie, Duncan S. (detail)
Osmoregulation in wild and captive West Indian manatees (Trichechus manatus).
Physiol. Zool. 71(4): 449-457. 4 tabs. 2 figs. July/Aug. 1998.
–Experiments manipulating water salinity and animals' access to fresh water were conducted on captive and wild-caught T. m. latirostris and T. m. manatus in Florida, Brazil, Colombia, and Puerto Rico. High aldosterone levels in wild freshwater animals may indicate a need to conserve sodium or to have access to marine habitats; captinve animals in fresh water may be susceptible to salt deficiency. High vasopressin levels in wild brackish-water manatees suggest use of an antidiuretic state to conserve water. Concludes that manatees are good osmoregulators regardless of the environment.
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.
Courbis, S. S.; Worthy, Graham A. J. (detail)
Opportunistic carnivory by Florida manatees (Trichechus manatus latirostris).
Aquatic Mammals 29(1): 104-107.
–Feeding on tunicates.
Ortiz, Rudy M.; Worthy, Graham A. J. (detail)
Could lower body fat mass contribute to cold-water susceptibility in calves of the West Indian manatee (Trichechus manatus)?
Mar. Mamm. Sci. 20(1): 176-183. 2 tabs. 2 figs. Jan. 13, 2004.
–Estimation of body components by isotopic dilution in 8 Florida and 5 Brazilian captive manatees showed correlation between fat mass and age. Manatees appear to reach adult levels of body fat between 1 and 2.5 years of age, prior to which their relatively lower fat mass may indeed increase their cold susceptibility.
Fertl, Dagmar; Schiro, A. J.; Regan, G. T.; Beck, Cathy A.; Adimey, Nicole M.; Price-May, L.; Amos, A.; Worthy, Graham A. J.; Crossland, R. (detail)
Manatee occurrence in the northern Gulf of Mexico, west of Florida.
Gulf & Caribbean Research 17: 69-94. 1 fig. 2 appendices.
Reich, K. J.; Worthy, Graham A. J. (detail)
An isotopic assessment of the feeding habits of free-ranging manatees.
Mar. Ecol. Progress Series 322: 303-309.
Alves-Stanley, C. D.; Worthy, Graham A. J. (detail)
Carbon and nitrogen stable isotope turnover rates and diet-tissue discrimination in Florida manatees (Trichechus manatus latirostris).
Jour. Exper. Biol. 212(15): 2349-2355.
Alves-Stanley, C. D.; Worthy, Graham A. J.; Bonde, Robert K. (detail)
Feeding preferences of West Indian manatees in Florida, Belize, and Puerto Rico as indicated by stable isotope analysis.
Marine Ecology Progress Series 402: 255-267.

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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