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Fig. 6. (A) Dorsal view photograph of the horizontal septum (i.e. vertebrae level)
of a 62.7 cm fork length (FL) Sarda orientalis (S) and a
75.4 cm FL Euthynnus affinis (E). Yellow lines mark an
anterior oblique tendon (AOT) extending from a vertebra out to the
inter-tendon length (ITL), the segment of the posterior oblique tendon (POT)
that parallels the backbone and spans one or two adjacent AOTs. The AOTs act
as slings to support the POT (see Westneat
and Wainwright, 2001), and the POT segment that inserts onto
posterior vertebrae. The greater POT angles in Sarda reflect its
lateral red muscle (RM) position. (B) Maximum lateral displacement (as
percentage of fish total length, % TL) at each vertebral joint as a function
of relative position along the body for Sarda chiliensis (turquoise
squares) and kawakawa tuna (Euthynnus affinis; red circles). Modified
from Dowis et al. (2003); tuna
data from Donley and Dickson
(2000).
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