Table 1.

The average physiological parameters of five hooded seal pups during the first 12 days of their 33 day post-weaning fast when all animals had ad lib access to snow

BMstart (kg)	BMend (kg)	N start (l)	N end (l)	K 2H (d−1)	K N (d−1)	$t_2^1$ (d)	MR (kcal day−1)
${\overline{X}}_{snow}$
43.2 ± 5.3	38.4 ± 4.8	15.7 ± 1.9	13.5 ± 1.8	0.034 ± 0.009	0.013 ± 0.007	21.5 ± 4.3	1862 ± 417
${\overline{X}}_{\text{seawater}}$
38.4 ± 4.8	31.3 ± 4.5	13.5 ± 1.8	11.4 ± 1.0	0.039 ± 0.001	0.008 ± 0.006	17.9 ± 0.4	1821 ± 380

The average parameters of four hooded seal pups during the last 21 days of their post-weaning fast when they had ad lib access to seawater

BM _start body mass at start of snow or seawater exposure period, BM _end body mass at end of snow or seawater exposure period, N _start total body water at start of snow or seawater exposure period, N _end total body water at end of snow or seawater exposure period, K _2H fractional turnover rate of tritiated water, K _N fractional turnover rate of body water, $t_2^1$ biological half-time of tritiated water in the body pool, MR daily metabolic rate based on protein and fat loss during the separate periods of the hooded seals fast