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Table 4.

Estimated water budget for a fasting elephant seal pup

Water produced from 408 g blubber*+434 g day−1 
Water produced from 192 g lean tissue+161 g day−1 
REWL from apneustic breathing (9.12 h day−1): −24 g day−1 
REWL from non-apneustic breathing (14.88 h day−1): −67 g day−1 
Cutaneous water loss∼0 g day−1 
Fecal water loss§−20 g day−1 
Urinary water loss (week 1 of fast)−433 g day−1 
Net gain/loss: +51 g day−1 
Water produced from 408 g blubber*+434 g day−1 
Water produced from 192 g lean tissue+161 g day−1 
REWL from apneustic breathing (9.12 h day−1): −24 g day−1 
REWL from non-apneustic breathing (14.88 h day−1): −67 g day−1 
Cutaneous water loss∼0 g day−1 
Fecal water loss§−20 g day−1 
Urinary water loss (week 1 of fast)−433 g day−1 
Net gain/loss: +51 g day−1 

REWL, respiratory evaporative water loss.

*

1.071 g H2O g−1 lipid (Costa and Williams,2000), 41 g preformed H2O(Crocker, 1995).

0.396 g H2O g−1 protein (Costa and Williams,2000), 140 g preformed H2O(Pace and Rathbun, 1945).

(Renouf et al., 1991).

§

D. P. Costa, unpublished data.

(Adams, 1991).

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