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Fig. 5. The influence of feeding on (A) the osmolality and (B) the urea
concentration of the fluid phases of the gastrointestinal contents in
stomach-1 (cardiac stomach), stomach-2 (pyloric stomach) and intestine in the
dogfish shark. Simultaneously measured values in the blood plasma are also
shown. Means ± 1 s.e.m. (N=6–8 at each time point). As
points of reference, the dark bars represent the measured values for ambient
seawater (SW) (N=4), and the light bars represent the estimated value
for the ingested food [N=5; value for osmolality from Holmes and
Donaldson (Holmes and Donaldson,
1969)]. Significant differences are not marked in A so as to avoid
clutter; the only significant differences (P<0.05) within
compartments are in plasma osmolality, as indicated by means not sharing the
same letter in the following series: a=6 h, 30 h, 360 h; b=20 h, 120 h, 360 h;
c=20 h, 60 h, 120 h. In B, within a compartment, means not sharing the same
letter are significantly different (P<0.05). For clarity, x,y
refers to stomach-2 and a,b to stomach-1.
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