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Fig. 1. (A) The percentage of fast-oxidative fibers (Type IIA) increased
significantly in the swimming muscle as seals matured and increased their dive
durations. Histogram showing the change in fiber type composition (% of total
fiber number), in the swimming (longissimus dorsi) muscles of Weddell seals as
they mature. (B) The mitochondrial volume densities in the swimming muscles
decreased as the seals matured. Histogram showing the decrease in the volume
density of mitochondria in the swimming muscle of Weddell seals as they
mature. Values are means ± s.e.m. (N=6). * denotes
significantly different from the pups;
denotes
significantly different from adults (P<0.05, ANOVA).