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Osmoregulation in Marine Mammals

Rudy M. Ortiz1,2,*

1 Department of Biology, University of California, Santa Cruz, CA 95064, USA and
2 Neuroendocrinology Laboratory, Division of Life Sciences, NASA Ames Research Center, Moffett Field, CA 94035, USA



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  		Fig. 1. Correlation between plasma and urine osmolality for various marine mammals. The freshwater species are the West Indian manatee (Trichechus manatus), American river otter (Lutra canadensis) and Baikal seal (Phoca sibirica). See Table1 for references. The regression was considered significant at P<0.05.

 


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  		Fig. 2. Correlation between plasma renin activity and aldosterone levels in four species of marine mammal, bottlenose dolphin (Tursiops truncatus), California sea lion (Zalophus californianus), northern elephant seal (Mirounga angustirostris) and West Indian manatee (Trichechus manatus). Data for dolphins (N=3) and sea lions (N=4) are individual points extrapolated from Figs2 and 3 in Malvin et al. (Malvin et al., 1978). Data for fasting, postweaned elephant seal pups (N=15) are means extrapolated from Fig.1 of Ortiz et al. (Ortiz et al., 2000). Data for West Indian manatees (N=4) held in fresh water are means extrapolated from Fig.2 of Ortiz et al. (Ortiz et al., 1998). Regressions were considered significant at P<0.05.

 

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