Figure 9.2 A young Weddell seal pup and nursing mother. Note the lanugo coat of the pup. The fur
of the mother is kept cool and snow can sit on the surface without melting, except where the pup has
been nursing. (Photo by M. Castellini, MMPA Permit #801.)
100
0
(a)
(b)
20
40
60
80
100
80
60
40
20
0
Fasting phase
Metabolic rate
Rate of body mass loss
I
I I
III
Proteins
Lipids
% of maximum level
% contribution to energy use
Glucose
Figure 8.3 Predicted changes in physiological parameters according to the classical three phases of
fasting as detailed by Cherel et al. (1988). Significant changes include a shift in metabolic fuel use (a)
and rates of body mass loss and mass-specific metabolic rates (b).
of the mother is kept cool and snow can sit on the surface without melting, except where the pup has
been nursing. (Photo by M. Castellini, MMPA Permit #801.)
100
0
(a)
(b)
20
40
60
80
100
80
60
40
20
0
Fasting phase
Metabolic rate
Rate of body mass loss
I
I I
III
Proteins
Lipids
% of maximum level
% contribution to energy use
Glucose
Figure 8.3 Predicted changes in physiological parameters according to the classical three phases of
fasting as detailed by Cherel et al. (1988). Significant changes include a shift in metabolic fuel use (a)
and rates of body mass loss and mass-specific metabolic rates (b).