Table 3. The area occupied by the adipocytes intermixed within the perimysium was show as the percentage with respect to the total sample area.

Group	%IAT
Shallow-diving	1,95 ± 2,10
S. frontalis (n = 5)	3,44 ± 3,44
T. truncatus (n = 5)	0,47 ± 0,41
Deep-diving	26,01 ± 1,03
G. macrorhynchus (n = 5)	26,74 ± 12,24
Z. cavirostris (n = 5)	25,29 ± 12,39

Values are expressed as mean (±s.d.). A statistically significant (P = 0.000) difference was obtained when both groups were compared by the Mann-Whitney U test for two independent-samples.