The Company of Biologists

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

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D. P. Costa, unpublished data.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).